GB 50150-2006 Standard for Hand-over Test of Electric Equipment

- 2 Direct current resistance measuring stator winding; 3 DC withstand voltage test and leakage current mensuration of the stator windings; 4 Alternating Current AC withstand voltage

Issucd on June 20,2006 I m p l e n ~ e ~ ~ ~ e t l on November 1 , 2006

Jointly issued by the Ministry of Construction of the People's Republic of China

and the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

The Ministry of Construction of the People's Republic of China

No 438

Announcement of publishing the national standard "Standard for Hand-over Test of Electric Equipment Electric Equipment Installation Engineering" by the Ministry of ~onstruction

"Standard for Hand-over Test of Electric Equipment Electric Equipment Installation Engineering" has been approved as a national standard with a serial number of GB

50150-2006, and implemented since November 1, 2006 Therein, articles (items) 3.0.1 (I, 4, 5

and18),4.0,1(1,8and9),6.0.1(1),7.0.1(2,3,4and8),8.0.1(2),9.0.1(1,7and8),12.0.1

(2 and3), 13.0.1 (2, 12and 13), 14.0.1 ( 1 , 2 , 3 and4), 18.0.1 (1 and5),21.0.1 (I), 25.0.1 (1 and 3) and 26.0.1 (2) are compulsory provisions and must be enforced strictly "Standard for Hand-over Test of Electric Equipment Electric Equipment Installation Engineering" GB

50 150-9 1 shall be abolished simultaneously

Authorized by Standard Rating Institute of Ministry of Construction, this code is published and distributed by China Planning Press

The Ministry of Construction of the People's Republic of China

June 20,2006

Foreword

According to the requirements of Document Jiao Biao [2003] No.102 issued by the Ministry of Construction (M0C) "Notice on Printing the Development and Revision Plan of National Engifleering Construction Standards in 2002-2003", this standard is got by the revision edition of "Standard for Hand-over Test of Electric Equipment Electric Equipment Installation Engineering" GB 50150-1991 by the Electric Power Construction Research Institute of SGCC, Beijing and other organizations concerned

The standard comprises 27 chapters and 7 appendices with the main contents are: general provision; terms; synchronous generator and rotary condenser; direct current dynamo; intermediate frequency generator; alternating current motor; power transformer; reactor and arc-suppression coil; instrument transformer; oil circuit breaker; blowing air and magnetic blast breaker; vacuum circuit breaker; sulfur hexafluoride circuit breaker; sulfur hexafluoride gas insulated switchgear; isolating switch, load switch and high voltage fuse; bushing; suspension insulator and pillar insulator; power cable lines; capacitor; insulating oil and SF6 gas; arrester; electrostatic precipitator; secondary circuit; 1KV and less voltage power distribution equipment and feed line; overhead power line above 1KV; grounding connection; low-voltage electrical appliances

Comparing with the original standard, this standard adds content as below:

1 Terms;

2 Implementing principles on standard for hand-over test of the imported equipment; ,

3 Natural-vibration frequency test and modal analysis on winding end of the generator stator;

Note: "Measurement and Evaluation of the Dynamic Characteristic on Stator End Windings of the Large Turbo-generator natural-vibration frequency test and modal analysis on winding end" D m 735-2000

4 The pilot project of Gas-insulated transformer, and the inspection and pilot project of the on-load transformer switching regulator device;

5 Some pilot project and touchstone of the instrument transformer, breaker and electrostatic precipitator;

6 Alternating current (hereinafter referred to as AC) withstand voltage test and crossing

interconnected system test of power cable lines;

7 Specification for the pilot project and grounding impedance value of the grounding connection

8 An increase of four appendices: partial discharge test method of the transfortner; Excitation curve measurement of protected level of the current transformer; test method and requirementof power cable cross interconnected system; special pilot projects

The provisions printed in bold type are compulsory provisions and must be enforced strictly

The Ministry of Construction is in charge of the administration of this standard and the explanation of the compulsory provisions Electric Power Construction Research Institute of SGCC, Beijing is responsible for the explanation of specific technical contents

All relevant organizations are kindly requested to sum up and accumulate your experiences in actual practices during the process of implementing this standard The relevant opinions and advice, whenever necessary, can be posted or passed on to Electric Power

Consbuction Research Institute of SGCC, Beijing (address: N0.31, Nanbinhe Road, Xuanwu District, Beijing, China, Te1ephone:OlO-63424285)

Chief Development Organization, Participating Development Organizations and Chief Drafting Staffs of this standard:

Chief De~elopment Organization: Electric Power Construction Research Institute of SGCC, Beijing

Participating Development Organizations: Anhui Electric Power Research Institute

No 2 Engineering Company of Northeast Power Administration Bureau China Electric Power Research Institute

Wuhan High Voltage Research Institute North China Electric Power Research Institute Liaoning Electric Power Research Institute Guangdong Power Test & Research Institute Guangdong Power Transmission Comapny Power Transmission & Transformation Corporation Tianjin Electric Power Construction Company Shandong Electric Power Construction No 1 Company Guangxi Transmission & Substation Construction Company Chief Drafting Staffs: Guo Shouxian, Sun Guanfu, Chen F a y , Yao Senjing, Bai Yamin, Yang Rongkai, Wang Xuan, Han Honggang, Xu Bin, Zhang Bin, Wang Xiaoqi, Ge Zhanyu, Liu Zhiliang, Yin Zhimin and Zhang Cheng

Contents

1 General provisions ; 1

2 Terms 3

3 Synchronous generator and rotary condenser 5

4 Direct current dynamo 11

5 Intermediate frequency generators 13

6 Alternating current motor (AC motor) 14

7 Power transformers 16

8 Reactor and arc-suppression coil 23

9 Instrument transformers 25

10 Oil circuit breakers 30

11 Air and magnetic blast breaker 35

12 Vacuum circuit breakers 37

.

13 Sulphur hexafluorlde clrcuit breakers 38

14 Sulfur hexafluoride gas insulated switchgear 40

15 Isolating switch, load switch, and high voltage fuse 42

16 Bushing 43 17 Suspension insulator and pillar insulator 45

18 Power cable line 46

19 Capacitors 49

20 Insulating oil and SF6 gas 51

21 Arresters 53

22 Electrostatic precipitators 55 23 Secondary circults 57

24 1KV and less voltage power distribution equipment and feeder line 58

25 Overhead power line above 1kV 59

26 Grounding connection 60 27 Low-voltage electrical apparatus 62

Appendix A Voltage Standard for the Power Frequency Withstand Voltage Test of the Insulation of High-voltage Electrical Appliance 63

Appendix B the Reduction Coefficient of Ohmic Value Recalculation for the Winding Insulation of Electric Machine Stator-to Working Temperature 64

Appendix C Test Method for Partial Discharge of Transformer 65 Appendix D Reference Value for the DC Leakage Current of Oil-immersed Power Transformer Winding 67

Appendix E Measuring Method for the Current Transformer Excitation Curve of Protection Level 68

Appendix F Test Method and Requirements of the Transposition and Interconnection System of

Power Supply Cable 72

Appendix G Specific Test Project 74

Explanation of Wording in This Standard 75

1 General provisions 1.0.1 This standard is formulated with a view to meet the requirement of hand-over test of the electric equipment electric equipment installation engineering and promotes popularization and applicatior of new technique for the hand-over test of electric equipment

1.0.2 This standard is applicable to hand-over test of 500kV and less voltage newly installed electric equipment which is eligible according to relevant works test standard of the nation This standard is not applicable to electric equipments installed under the colliery well or other site with explosive risk

1.0.3 Hand-over test of mechanical parts of the relay protection, automatism, telemechanism, communication, measurement, rectifying device and electric equipment shall be in accordance with the relevant provisions of standards or codes respectively

1.0.4 Electric equipment shall make AC withstand voltage test according to this standard, but

if this standard not specifies requirement for electric equipment with voltage of 1 lOkV and higher, it may not make AC withstand voltage test

Making AC withstand voltage test, time shall be increased to duration time after standard voltage of the test, if no special requirement is made, it shall be lmin

When the withstand test voltage value is calculated as multiple of the nominal voltage, dynamo and electromotor shall be calculated according to nominal voltage in the nameplate, and the cable may be calculated according to method specified in Chapter 18 of this standard

AC withstand test voltage of off-standard voltage electric equipment may be calculate$ according to adjacent voltage proportions with interpolation method when no special requirement is made

When making insulation test, it should make single test by separating the equipments link together in addition to the complete set of equipment assembled by the builder's Equipment with same touchstone may be tested together In order to convenient for field test work, same voltage but different touchstone electric equipments with works test records may

be tested together when single test is difficult Touchstone shall adopt the minimum standard among all the connected equipments

Insulation test for oil-immersed type transformer and reactor shall be made suffusing with corrected oil After standing for a certain period of time, it may be carried out after the elimination of air bubbles Standing time complies with the builder's requirement, when builder's hasn't any requirement, electric equipment with 500kV voltage shall be standing for more than 72h; 220-330kV for more than 48h; and llOkv and lower for more than 24h

1.0.5 When only individual item fells short of the requirement of this standard during the measuring and testing process on electric insulation, it shall make a comprehensive judgement

on the test records, and the eligible one may be put into operation

1.0.6 When rated voltage and rated operational voltage in-service use are different, it shall determine the testing voltage according to the following requirements:

1 It shall be made according to touchstone for rated voltage of the equipment when reinforcing insulation with electric equipment with higher rated voltage;

2 It may make test according to touchstone for rated operational voltage of equipment in-service use when adopting electric equipment with higher voltage that meets the requirements of product commonality and mechanical strength;

3 It may make test according to touchstone for rated operational voltage of equipment

in-service use in the installation site when adopting electric equipment with higher voltage;

1.0.7 Making the temperature and humidity tests, it shall measure simultaneously the

temperature and humidify around the tested objects Insulation test shall be made in the following conditions: in a fine day; the temperature around the tested object and equipment should not be lower than 5'C; relative humidity should not be higher than 80% Test data not satisfying with the above-mentioned temperature and humidity conditions shall be made with comprehensive analysis to determine whether electric equipment can be put into operation Test should pay attention to the impact of environmental temperature; for oil-immersed type transformer, reactor and arc-suppression coil, it shall use the upper-oil temperature of the tested object as the test temperature

Normal temperature scope specified in this standard is 10'C-40°C

1.0.8 Insulation measurement listed in this standard shall be with insulation value of 60s;

absorptance measurement shall be ratio between insulation value of 60s and 15s; polarization index shall be ratio between insulation value of lOmin and lmin

1.0.9 When making insulation test with the multi-winding equipment, non-tested winding

shall be short-circuit grounding

1.0.10 Adopt voltage in the megger when measuring the insulation resistance; if this standard

doesn't male any special requirement, it shall comply with the following requirements:

1 Electric equipment or circuit lower than lOOV adopts 250V 50MQ and above megger;

2 Electric equipment or circuit within 100V-500V adopts 500V 100MQ and above

6 When it is used for mensuration of polarization index, megger short-circuit current

shall not be lower than 2mA

1.0.11 The high-pressure test method of this standards shall comply with requirement of

current national standard "High Voltage Sest Techniques Part I: General Test Requirements" GBIT, "High Voltage Test Techniques Part 2: Measuring Systems" GBIT 16927.2, "Guide for Insulatio~i Test" DLIT 474.1-5 and relevant standard for requirement of equipment

1.0.12 Hand-over test of imported equipment shall comply with standard specified according

to the contract But it shall pay attention to touchstone for the same pilot project when signlng the equipment contract and it shall not be lower than those specified in this standard

1.0.13 Tests with technical difficulty and specific requirement shall be made with the pilot

project by the organizations with corresponding qualifications and test capacity, and these tests are classified as a special pilot projects Special pilot projects see Appendix G

2 Terms 2.0.1 Power transformer

Static equipment with two or more windings: in order to transfer power, it transfers

alternating voltage and electric current in one system to voltage and currents in another

system thlough electromagnetic induction under the same frequency under the same

frequency Generally, these current and voltage values are different

2.0.2 Oil-immersed type transformer

Transformer with iron core and winding immersed in the oil

2.0.3 Dry-type transformer

Transformer with iron core and winding not immersed in the insulating liquid

2.0.4 Neutral terminal

The three-phase transformer or three-phase group composed of single-phase transformer

refer to common point (neutral point) terminal of Y-junction or meander configuration

coupling; for the single-phase transformer, it refers to terminal connecting the network neutral

point

2.0.5 Winding

It composes a group of conductor turn of the electric circuit corresponding to a voltage

labeled by the transformer

2.0.6 Tapping

Among the transformers with tapping windings, each tapping connection of the winding>

denotes its tapping winding; effective turns with a known value also denotes ratio-turn with

,known value between its tapping winding and winding with any other fixed turns

2.0.7 Non-uniform insulation of a transformer winding

When neutral terminal of the transformer winding is grounding directly or indirectly, the

insulation level of its neutral terminal shall be lower than those specified by the circuit

terminal

2.0.8 Uniform insulation of a transformer winding

Leading-out terminal with all the transformer windings and terminals connecting

together shall be provided with same rated insulation level

2.0.9 Shunt inductor

Reactors parallel connected on the system are mainly used for the compensation of

capacitance current

2.0.10 Arc-suppression coil

Single-phase reactor connecting between neutral point of the system and the ground is

used for the compensation of grounding capacitance current caused by single-phase earth

fault of the system

2.0.11 Instrument transformer

It refers to a general designation of the current transformer, electromagnetic voltage

transfonner, capacitance voltage transformer (CVT) and transformer combinations (including

the combination of single-phase transformers and the combination of three-phase t transfor~ners) As the combination of transformer is based on current transformer and

electromagnetic voltage transformer combination, correlation testing shall refer to projects of

current transformer and voltage transformer

2.0.17 Large-scale grounding connection

1 lOkV and above voltage substations, thermal power plant and hydraulic power plant with equipped capacitor of 200MW and above or grounding connection with equivalent plain area is within 5000m2 and more

3 Synchronous generator and rotary condenser

3.0.1 The pilot project for synchronous generator and rotary condenser with'6000kW capacity

and above shall include the followingcontent:

1 Insul?tion resistance and ahsorptance polarization index measuring stator winding; -

2 Direct current resistance measuring stator winding;

3 DC withstand voltage test and leakage current mensuration of the stator windings;

4 Alternating Current (AC) withstand voltage test of the stator winding;

5 Insulation resistances measuring the rotor windings;

6 DC resistance measuring the rotor winding;

7 AC withstand voltage test of the rotor winding;

8 Mensuration of insulation resistance of excitation circuit of the generator or exciting

dynamo and their connecting devices, excluding generator rotor and exciter armature;

9 AC withstand voltage test of excitation circuit of the dynamo or exciting dynamo and their connecting devices, excluding generator rotor and exciter armature;

10 Measure insulation resistance of generator, insulated hearing and rotor water inflow

bearing of the exciting dynamo;

11 Inspection of embedded temperature detector;

12 Measure DC resistance of field-suppressing resistor and self-synchronizing resistor;

13 Measure alternating-current impedance and power loss of the rotor winding (brushlesg

excitation unit may not be measured when measurement conditions are unavailable);

14 Measure and record three-phase short-circuit characteristic;

15 Measure and record no-load characteristic;

16 Measure de-excitation time-constant and over-voltage multiple of the rotor whet1 generator stator is open circuit;

17 Measure the stator residual pressure after switching with the automatic excitation cut-off device of the generator;

18 Measure phase sequences

19 Meas'i~re shaft voltage;

20 Natural-vibration frequency test and modal analysis on stator winding end;

21 Applying volts D.C on wrapped insulation for the stator winding end

Note: 1 Synchronous generator with IkV and less voltage shall be tested according to items 1,2,4, 5, 6 , 7 , 8 , 9 , 11, 12, 13, 18 and 19 regardless of its capacity

2 Rotato~y condenser without starter motor or starting motor of rotary condenser only allows short-time running may not

be tested as item 14and 15

3.0.2 Mensuration for insulation resistance and absorptance or polarization index of the stator

winding stator shall be in accordance with the following requirements:

1 Unbalance factor of various phases of insulation resistance shall not be larger than 2;

2 Absorptance: insulation of asphalt gumming and baked mica shall not be less than 1.3; insulation of epoxy mica powder shall not be less than 1.6 The machine set with capacity of 200MW and more shall be measured polarization index and the polarization index is less than 2.0

Note: 1 Insulating of the machine winding shall meet the requirement specified in this section before making AC withstand

3.0.3 The measurement for DC resistance of the stator winding shall be in accordance with the following requirements:

1 DC resistance shall be measured in cold state, and the difference between surface temperature of the winding and the ambient air temperature shall be within* 3'C when being measured;

2 Difference between DC resistances of phases or windings in different branches shall not exceed 2% of the minimal value after colrecting the errors caused by different down-lead lengths; comparing with numerical value converted to that measured when the product ex works, its relative variation shall be no larger than 2%

3.0.4 Mensuration for DC withstand voltage test and leakage current of the stator winding

shall be in accordance with the following requirements:

1 Testing voltage is 3 times of the rated voltage of electric machine;

2 Testing voltages rise by 0.5 times for each grade; it rests for 1 min in each phase, and is recorded with leakage current; leakage current shall be in accordance with the following requirements under the specified testing voltage:

Test each voltage level of 0.5 times the rated voltage increased in stages, each stage of the stay lmin; and record the leakage current; in the provision of the test voltage, leakage current shall meet the following requirements:

1) Differences between phases of leakage current shall not be larger than 100% of the minimal value; when the maximal leakage current is lower than 20pA, and comprehensive judgement result on the insulation value and AC withstand voltage test is all right, difference between the phases may not be considered;

2) Leakage current shall not be increased with prolongation of the time;

It shall find out reason and eliminate it when it cannot at least one of the forementioned specifications

3) When the leakage current is substantial increased disproportionately with voltage, it shall be analyzed in time

3 Hydrogen-cooled electric machine must be tested before hydrogen filling or after the hydrogen exhausting and the hydrogen content is lower than 3%, test making during the process of hydrogen displacement is strictly prohibited;

4 It should adopt low voltage screen method when making internal watei cooling electric machine test; for electric machine with water header grounding deadly, the field may not make this item of test

3.0.5 Voltage adopted during AC withstand voltage test of the stator winding shall be in accordance with those specified in Table 3.0.5 Insulation AC withstand voltage test during

the stator winding technical process for the field-installed hydraulic generator shall be in accordance with relevant regulations specified in current national standard "Specification for Installation of Hydraulic Turbine Generator Units" GBIT 8564 When the internal water -

cooling electric machine is test on passage occasion, the water quality shall be eligible; hydrogen cooling electric machine must be tested before hydrogen filling or hydrogen exhausting with the hydrogen content of lower than 3%, and the test is strictly prohibited to

be made during the hydrogen displacement process AC withstand voltage test of high-capacity generator may be replaced with pressure resonance when AC \Yithstand voltage

test equipment with line frequency cannot meet the requirement

Table 3.0.5 AC Withstand Voltage Test Voltage of the Stator Winding Capacity (kW)

Note: Un is the rated voltage ofsenerator

10000 and above

3.0.6 The measurement for insulation resistance of the rotor winding shall be in accordance

with the following requirements:

1 Insulation value of the rotor winding should not be less than 0.5M0,

Rated voltage (V)

2 Internal water cooling rotor winding is measured with 500V and under megger or other equipment, and the insulation value shall not be less than 5000.Q;

Testing voltage (V)) Under 10000

10000 and above 1 24000andabove I Negotiate with the iscton

Under 24000

3 When winding insulation resistance of the generator stator has been in line with the

requirements of start-up, and insulation value of the rotor winding is no less than 2000.Q it

(1000+2Un) x0.8

may be allowed to be put into operation;

4 Measure insulation resistance of rotor winding before and after overspeed test when

Under 36

the electric machine is with rated speed;

5 The adopted megger voltage grades when measuring the insulatio~? resistance: when rated voltage of the rotor winding is above 200V, adopts 2500V megger; 200V and under,

(IOO0+2Un) x0.8

adopts lOOOV megger

3.0.7 The measurement of DC resistance of the rotor winding shall be in accordance with the

following requirements:

1 It shall be made in cold state, and the difference between surface temperature of the

winding and the ambient air temperature shall be within+ 3'C when being measured Comparing measured numerical value with that of product ex works being converted to the same temperature, their difference shall not exceed 2%;

2 It shall measure all the pole windings for salient pole type rotor winding; when the error exceeds the requirement, it shall measure resistance of the connection point among all pole windings

3.0.8 Test for DC resistance of the rotor winding shall be in accordance with the following

specified by the builder's Assembled AC withstand voltage test shall be in accordance with the following requirements: '

I ) Voltage grade with rated excitation voltage of 500V and below is 10 times of the rated excitation voltage, and it shall not be less than 1500V;

2) Rated excitation voltage is 500V and above shall be 2 times of the rated excitation voltage plus 4000V

3 Distributed polar rotor winding may not be made with withstand voltage test, and it

may measure insulation resistance with 2500V megger instead

3.0.9 Mensuration of insulation value of excitation circuit of the dynamo or exciting dynamo and their connecting devices shall not be less than 0.5MQ If it has electronic component equipment in the circuit, the test shall be made by evulsing the plug-in board or short circuiting its two ends

Note: excluding measurement for insulation of generator rotor and exciter armature 3.0.10 Testing voltage for AC withstand voltage test on excitation circuit of the generatorlexciting dynamo and their connecting devices shall be 1000V, or be replaced by method of measuring insulation resistance with 2500v megger Testing voltage of the static thyristor excitation for the hydraulic generator shall be made in accordance with those specified in item 2 of article 3.0.8; equipment with electronic component in the circuit shall

be evulsed the plug-in board or short circuited the two ends when testing

Note: Excluding AC withstand voltage test of generator rotor and exciter armahlre

3.0.11 Measurement for insulation resistance of generator, insulated bearing and rotor water inflow bearing of the exciting dynamo shall be in accordance with the following requirements

1 It shall be measured with IOOOV megger after installing with oil tube, and the insulation value shall not be less than 0.5MQ,

2 It shall measure insulation resistance of the inside and outside spit ring for hydrogen-cooled generator, and its value shall be in accordance with the provisions of the factory

3.0.12lnspection of embedded temperature detector shall be in accordance with the following requirements:

1 ~ e a s u i e whether the insulation resistance of the temperature detector is all right with 250V megger;

2 Check indicated value ofthe thermodetector, and it shall be normal

3.0.13 Measurement for DC resistance of field-suppressing resistor and self-synchronizing resistor shall be comparing with nameplate numerical value, and their difference shall not exceed 10%

3.0.14 Measurement for alternating-current impedance and power loss of the rotor winding shall be in accordance with the following requirements:

1 They shall be measured inside and outside the stator bore under a static state and under rated speed before and after the overspeed test;

2 The salient pole electric machine may measure pole windings one by one outside the bore It shall be without obvious difference between observed numerical values;

3 Peak value of the applying voltage during testing process shall not exceed voltage of the rated excitation

Note: bir~shless excitation machine set may not be tested when measuring condition is unavailable

3.0.15 ~ e a s u r e m e n t for the three-phase short-circuit characteristic shall be in accordance

with the following requirements:

1 Difference between the measured value and that of product works test shall be within

the measuring error scope;

2 For generator transformer unit, when short-circuit characteristic of the generator itself *

features routine test report of the manufacturing factory, it may only matriculate short-circuit

characteristic of the generator transformer unit, and its short dot shall be set in high-tension

side of the transformer

3.0.16 Measurement for no-load characteristic shall be in accordance with the following

requirements:

1 ~ifference between tlie measured value and that of product works test shall be within

the measuring error scope;

2 Maximum value of testing voltage under rated speed shall be 120% of the rated voltage

of the stator for turbogenerator and rotary condenser, and shall be 130% of the rated voltage

of the stator for hydraulic generator, but they shall not exceed electric current of the rated

excitation;

3 When the electric machine has interturn insulation, it shall be made with interturn

withstand voltage test, and it shall last for under 130% of the rated voltage of the stator (not

exceeding maximum voltage of the stator);

4 For generator transformer unit, when the generator's own no-load characteristics and

interturn voltage have builder's routine test report, it may not disconnect the generator as

no-load characteristic from the machine set, but only as full group no-load characteristic of

the generator transformer group, and the voltage shall increase to 105% of the rated voltage of

the stator

3.0.17 Measure and record he-excitation time-constant under no-load rated voltage of the

generator when the generator stator is with open circuit For the generator transformer group,

it may be tested together with no-load transformer

3.0.18 Measure residual pressure for the stator after automatic excitation cut-off device of

generator under no-load rated voltage

3.0.19 Measure phase sequence of the generator must be concord with that of electric

network

3.0.20 Measurement of shaft voltage shall be in accordance with the following requirements:

1 Measured during no-load rated voltage and after loading respectively;

2 When the bearing film of the turbo-generator is short circuit, voltage between the

bearing and frame shall be close to voltage on both ends' shaft of the rotor;

3 Generator shaft shall measure voltage of the shaft against the frame

3.0.21 Natural-vibration frequency test and modal analysis for end of the stator windings shall

be in accordance with the following requirements:

1 For 200MW and above turbo-generator;

2 Natural frequency of vibration and mode of vibration of stator winding end under

generator cold state,: it is disqualified when it has elliptic type vibration mode and natural P frequency of vibration is within 94-1 15Hz;

3 When the builder's has conducted the test and there is a routine test report, it may not

be tested

3.0.22 Measurement for wrapped insulation applying volts D.C at stator winding end shall be

in accordance with the following requirements:

1 With field assembling down-lead at the generator end, it shall be measured by applying

volts D.C after the dryness of insulation wrapping materials;

2 The applying volts D.C of the stator winding is generator rated voltage Un;

3 The measured surface DC potential shall be no larger than the specified value of the

builder's

4 Direct current dynamo

4.0.1 Pilot project of the direct current dynamo shall include the following content:

1 Measure insulation resistance of excitation winding and armature;

2 Measure DC resistance of the excitation winding;

<

3 Measure DC resistance among the armature rectiblocks;

4 AC withstand voltage test of excitation winding and armature;

5 Measure DC resistance of the excitation rheostat;

6 Measure insulation resistance of excitation circuit and all the connecting devices;

7 AC withstand voltage test of excitation circuit and all the connecting devices;

8 Inspect polarity of machine winding and the connective validity;

9 Measure and adjust motor brush and make it lie in the neutral position of the magnetic field;

10 Measure and record no-load characteristic of the DC generator and regulation curve

of exciting dynamo based on load of rotor winding;

11 Idle inspection and no-load current measurement of the DC motor;

Note: exciting dynamo of synchronous generator and rotary condenser above 6000kW shall be tested according to all the projects specified in this article Other DC machine shall be tested according to items 1, 2, 5, 6, 8 , 9 and 1 l of this article

4.0.2 Measure insulation value of excitation winding and armature, and it shall not be less

than 0.5Mn

4.0.3 Measure DC resistance of the excitation winding, comparing with that in the builder's,

the difference between them shall not be larger than 2%

4.0.4 Measure DC resistance among the armature rectiblock and it shall be in accordance with

the following requirements:

1 The lap winding may be measured between the rectiblocks; for undulated series

winding, distance between two rectiblocks is equal to that of the commutator pitch when measuring; for breaststroke winding, it shall measure DC resistance between rectiblocks of the lap winding and undulated series winding according to practical situation of the connection;

2 The difference between them shall not exceed 10% of the minimal value; when regular variation emergent by equalizing cable or winding construction, it may make judgement of the compartment between corresponding rectiblocks

4.0.5 AC withstand test volt'age of excitation winding against the countershaft of crust and

armature winding shall be 1.5 times of the rated voltage plus 750V, and it shall be no less than 1200v

4.0.6 Measure DC resistance of the excitation rheostat, and comparing with that when product

ex works, the difference between them shall not exceed 10% The adjustment process shall be touched all right, without open circuit phenomena and the resistance value variation shall be regular

4.0.7 Measure insulation value of excitation circuit and all the connecting devices and it shall

not be less than 0.5Mn

Note: excluding measurement for insulation of excitation regulation device circuit

4.0.8 4 C withstand test voltage of the excitation circuit and all the connecting devices shall

be 1000V d r be replaced with measure insulation resistance mode with 2500V megger

Note: excluding AC withstand voltage test of excitation regulation device circuit

4.0.9 Inspect polarity and connection of the machine windings, this shall be accurate

4.0.10 Adjust neutral position for the motor brush, it shall be accurate and meet the

requirement for healthy inverting

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4.0.11 Measure and record no-load characteristic of dc generator and exciting dynamo

regulation curve with load of rotor winding, comparing with information during the products works test, itshall be without obvious difference Load characteristic of exciting dynamo should be measured and recorded simultaneously when making synchronous generator no-load and short-circuit test

4.0.12 Idle inspection and no-load current measurement of the DC motor shall be in

accordance with the following requirements:

1 No-load running time is normally no less than 3Omin, and interface between the brush

and commutator shall be without significant spark;

2 Record idle electric current of the DC machine;

5 Intermediate frequency generators

5.0.1 Pilot project of the intermediate frequency generator shall include the following content:

1 Measure insulation resistance of the winding;

2 Measure DC resistance of the winding;

3 AC withstand voltage test of the winding;

4 Measure and record no-load characteristic;

5 Measuring phases' sequences;

6 Measure insulation resistance of temperature detector and inspect whether is in good

condition

5.0.2 Measure insulation resistance of the winding and it shall not be less than 0.5MQ

5.0.3 Measurement of DC resistance of the winding; shall be in accordance with the following

requirements:

1 DC resistance of phases or different branches of the winding, it shall be compared with that when ex works and the difference shall not exceed 2%;

2 Compared DC resistance value of the excitation winding with the value when ex works,

it shall be without obvious difference

5.0.4 Voltage by AC withstand voltage test of the winding shall be 75% of the works test

5.0.6 Measure the phase sequences: Leading-out terminal number of the electric machine

shall he concord with the phase sequence

5.0.7 Measure insulation resistance of the temperature detector and verify temperature error,

and they shall be in accordance with the following requirements:

1 Measure insulation resistance of temperature detector with 250V megger;

2 Temperature detector error shall not exceed those specified by the builder's

6 Alternating current motor (AC motor)

6.0.1 Pilbt project of the AC motor shall include the following content:

1 Measure insulation resistance of the winding and absorptance;

2 MeasureDC resistance of the winding;

3 DC withstand voltage test of the stator winding and mensuration of leakage current;

4 AC withstand voltage test of the stator winding;

5 AC withstand voltage test of rotor winding of the wound motor;

6 AC withstand voltage test of rotor winding of the synchromotor;

7 Measure insulation resistance of the rheostat, starting resistor and field-suppressing resistor;

8 ~ e a s u r e DC resistance of the rheostat, starting resistor and field-suppressing resistor;

9 Measure insulation resistance of the motor bearing;

10 Inspect polarity of rotor winding and the connective validity;

11 Inspect tlie electromotor no-load turning and measure the no-load current

Note: electromotor under lOOOv voltage and with capacity of lOOkW may be tested according to items 1,7, 10 and 11 of this article

6.0.2 Measurement of insulation resistance of the winding and ahsorptance shall be in accordance with the following requirements:

1 Insulation value of rated voltage under shall not be less than 0.5Mn under normal

temperature; insulation value with rated voltage of lOOOV and above shall be with stator winding of no less than 1MQ /KV when the temperature being converted to working temperature, and the rotor winding shall not be less than 0.5M.Q /KV Temperature conversion

of the insulation resistance may he made according to those specified in Appendix B of this standard;

2 ~lectrokotor of 1 ooov and above shall be measured with ahsorptatice Absorptance shall not be less than 1.2 and for that may be with removable neutral point; the ahsorptance shall be measured by splitting phases

Note: 1 Wllen making AC withstand voltage test, insulation of the winding shall meet the requirement specified in this article;

2 For qualified electromotor by AC withstand voltage test, when its insulation resistance is less than its rated voltage

I W V after being converted to that under working temperature (electromotor insulated by epoxy mica powder), it (nay not be put into O p e r a I i ~ after drying However, it shall not make internal operation with opening end cover before being put into operation

6.0.3 Measurement of DC resistance of the winding shall be in accordance with the following

requirements:

Differences between DC resistances of phase's windings of the electromotor above lOOOV with capacity of more than lOOkW shall not exceed 2% of the minimum value; electromotor without neutral point educing may be measured with DC resistance in the lines, and the differences shall not exceed 1% of the minimal value

6.0.4 DC withstand voltage test and mensuration of the leakage current of the stator winding

shall be in accordance with the following requirements:

Stator winding above IOOOV and lOOOkW and with connecting line of the neutral point educing leading-out terminal plate shall he made with DC withstand voltage test with splitting

phases Testing voltage is 3 times of rated voltage of the stator winding; under the specified testing voltage, differences between phases of leakage current shall not be larger than 100%

of the minimal value; when the maximal leakage current is lower than ZOfi, phase to phase shall be without obvious difference Precautions shall meet relevant regulations specified in article 3.0.4 of this standard when being tested; it may not make this item of test without connectingline of the neutral point educing

6.0.5 The AC voltage test voltage of stator windings shall be in accordance with those specified in Table 6.0.5

Table 6.0.5 AC Withstand Test Voltage of the Electromotor Stator Winding

those specified in Table 6.0.6

Table 6 0 6 ~ ~ Withstand Voltaee Test Voltaee of Wound Motor

Rated voltage (kV)

Testing voltage (kV)

6.0.6 The AC withstand voltage test voltage of the wound motor shall be in accordance with

5

Working condition ofthe rotor

the rotor statrc process

6.0.7 AC withstand voltage test voltage of rotor winding of the synchromotor is 7.5 times of

the rated excitation voltage, and it shall not be less than 1200V, but it shall not be larger thaq

75% of the works test voltage

6.0.8 Insulation resistance of the rheostat, starting resistor, field-suppressing resistor shall not

be less than 0.5ML2 when measured together with the circuit

6.0.9 Comparing the measurement of DC resistance of the rheostat, starting resistor, field-suppressing resistor with that of the product ex works, their difference shall not exceed 10%; it shall be touched health and without open circuit phenomena during the adjustment process and the resistance value variation shall be regular

6.0.10 Measurement of the insulation resistance of the motor bearing shall be made with lOOOV megger after oil piping when oil pipeline connection is being used, and the insulation value shall not be less than 0.5MQ

6.0.11 Inspect polarity and connection of the stator windings, this shall be accurate Those without neutral point educing may not be inspected with polarity

6.0.12 Running time for the inspection of no-load turning of electromotor is Zh, and it shall record no-load current of the electromotor When the connection between electromotor and its mechanical part are unease to be disconnected, they may be inspected and tested with no-load turning linked together

7 Power transformers

7.0.1 The pilot project of the power transformer shall include the following cdntent:

1 Insulating oil test or SF6 gas test;

2 Measure<DCresistance ofwinding with the bushing;

3 Inspectvoltage ratios of all the tap joints;

4 Inspect three-phase linlc group of the transformer and polarity of single-phase transformer outlet;

5 Measure insulation resistance of fasteners connecting to the core insulation (connecting piece can be separated) and iron core (there are foreign cited earthing);

6 Test of non-pure ceramic bushing;

7 Inspection and test of the on-load transformer switching regulator device;

8 Measure insulation resistance, absorptance o r polarization index of the winding

with bushing;

9 Measure dielectric loss tangent tan6 of winding with hushing;

10 Measure DC leakagecurrent of winding with bushing;

11 Winding deformation test of transformer,

12 AC withstand voltage test of the winding with bushing;

13 The long induction voltage test with partial discharge tests of the winding with hushing;

14 Impact switching-in test under rated voltage;

15 Inspect the phase;

16 Measure the noise

Note: the pilot projects of transformers shall be made according to the following specitications except reasons specified in the provisions:

1 Test of oil-immersed power transformer with capacity of 1600kVA and below may be

carried out according to items 1,2,3, 4, 5, 6, 7, 8, 12, 14 and 15 of this article;

2 Test of dry-type transfonner may be carried out according to items 2, 3 , 4 , 5, 7, 8, 12,

14 and 15 of this article;

3 Test of;ariable flow and rectifier transformer may be carried out accdrding to items 1,

2, 3,4, 5, 7, 8, 12, 14 and 15 of this article;

4 Test of furnace transformer may be carried out according to items 1, 2, 3, 4, 5 , 6, 7, 8,

12, 14 and 15 of this article;

5 Wear-core current transformer and capacitor-type bushing shall be tested in accordance with instrument tra~~sformer specified in Chapter 9 and the pilot project specified in chapter

16 of this standard

6 Split transport and field-installed transformer shall be witnessed all works test projects

by the purchaser, and the field test complies with this standard

7.0.2 Test of insulating oil in oil-immersed type transformer and SF6 gas in SF6 gas-insulated

transformer shall be in accordance with the following requirements:

1 Insulating oil test types shall be in accordance with those specified in Table 20.0.2;

pilot project and standard shall be in accordance with those specified in Table 20.0.1

2 Chromatograpllic analysis of Dissolved Gas in the oil shall be in accordance with the following requirements: transformer with voltage of 66kV and above shall be made with

chromatographic analysis for the dissolved gas in the oil of inner insulation of the transformer separately after oiling standing, withstand voltage and partial discharge test for 24h, and running under impact switching-in and rated voltage Test shall comply with "Guide to the Analysis and the Diagnosis of Gases Dissolved in Transformer Oil" GBIT 7252 Measured hydrogen, acetylene and total hydrocarhon content of all times shall be without significant difference Any of H2 and hydrocarbon gas content (&/I,) in newly loaded transformer oil should not more than any of the following values:

Total hydrocarhon: 20 , H2: 10 , C2H2: 0,

3 Measurement of trace moisture in the oil shall be in accordance with the following

requirements: trace moisture content in the transformer oil shall not be larger than 20mgIL for that of 1lOkV voltage; shall not he larger than 15mgiL for 220kV; and shall not be larger than lOm& for 330-500kV

4 Measurement of air content in the oil shall he in accordance with the following

requirements: for transformer with 330-500kV voltage: standing as the specified time, sampling to measure air content in the oil and its value shall not be larger than 1% (in volume),

5 It shall make inspection and leak hunting on liquid water content in SF6 gases for gas-insulated transformer: liquid water content in SF6 gases (volume fractidn under 20°C) is generally no larger than 250&iL Transformer shall be without obvious leakage point

7.0.3 The measurement for DC resistance of winding with bushing shall be in accordance

with the following requirements:

1 Measurement shall be made in all the positions on the tap joints;

2 Difference between measured values of phases of the three-phase transformer with

voltage of 1600kVA and below shall be no less than 4% of the average value, and the difference between measured value of line to line shall be less than 2% of the average value; difference between measured values of phases of the three-phase transformer with voltage of more than 1600kVA shall be no less than 2% of the average value, and the difference between measured value of line to line shall he less than 1% of the average value;

3 Comparing with product ex works measured value under the same temperature, the corresponding variation of DC resistance of the transformer shall not be larger than 2%; resistance value under different temperatures is converted according to equation 7.0.3:

R2=RI(T+t2)/(T+tl) (7.0.3) Where: R1 and =-Resistance values under temperature in time of t l and t2 respectively;

T-Constant for calculation: 235 for copper conductor and 225 for aluminium

conductor

4 Differences may be compared as item 3 of this article when they exceed those specified in item 2 due to transformer structures However, it shall illuminate the reasons

7.0.4 Inspect voltage ratio of all the tap joints: comparing with data of builder's nameplate, it

shall be without obvious difference, and it shall be conform to the law of voltage ratio; permissible error of voltage ratio of power transformer with voltage of 220kV and above ie0.5% when it lies in the rated tap joints position

Note: "without obvious difference'' may be considered as follows:

1 Allowable deviation of transformer voltage ratio with voltage of below 35kV and voltage ratio of less than 3 shall not

2 Allowable deviations of voltage ratio under rated tapping of all other transformen shall not exceed* 0.5%

3 Other tapped voltage ratio shall be within 1/10 ofthe transformer impedance voltage (%), but it shall not exceed*l%

7.0.5 In'spect three-phase link group of the transformer and polarity of the single-phase

transformer, which must be in accordance with design requirement and marking in the nameplate and ?ymbols in the crust

7.0.6 Measure insulation resi'stance of fasteners connecting to the core insulation (connecting

piece can he separated) and iron core (there are foreign cited earthing), which shall be in accordance with the following requirements:

1 Transformers with body inspection shall be measured with insulation resistance of the connecting core-wear bolt yoke clamping piece and banded steel strip to iron yoke, iron core, tank and winding clamping ring When the yoke iron beams and one end of the core-wear bolts are connecting with the iron core, the test shall be made after disconnection of the connection strap;

2 Transformers with or without body inspection shall be made with insulation measurement for the iron core and clamping piece (with foreign cited earthing) after all the installation work;

3 When iron core must he with one point grounding and with special iron core grounding

conductor educing the bushing on the transformer, it shall measure insulation resistance to its crust before oiling;

4 ~ e a s u i e with 2 5 0 0 ~ megger: the duration time is lmin, and it shall be without flashover and punchthrough

7.0.7 Test of the non-pure ceramic bushing shall be made according to those specified in'

Chapter 16 of this standard

7.0.8 Inspection and testing of on-load pressure adjustment switching device shall be in

accordance with the following requirements:

1 Switching process test of on-load pressure adjustment switch device before electrification of the transformer shall be inspected with all the sequence of movement and measured with the resistance value and switching time of the transitional resistance The measured transitional resistances, three-phase synchronism deviation, switching time, forward and reverse switching time deviation meet the technical requirements of the builder's If cannot be measured because of transformer structure and connection reasons, it shall not be made with this item of test;

2 In the non-voltage transformer, manual operation shall not be less than 2 cycles and electric operation shall not be less than 5 cycles Therein, supply voltage is 85% and above of the rated voltage when it is electrically operated Jam-free operations, moving process, electrical and mechanical spacing are normal;

3 Measure DC resistance and voltage ratio under all tapings of winding with bushing

after cycle operation, the test result shall be in accordance with those specified in article 7.0.3 and article 7.0.4 of this standard

4 If making on-load pressure adjustment switch electric operation under electrification condition of the transformer, the movement shall be normal Voltages on all sides shall be within allowable scope of the system voltage during the operational process

5 Flashover voltage of insulating oil before infusing in the switch tank shall be in accordance with those specified in table 20.0.1 of this standard

7.0.9 Measure insulation resistance, absorptance or polarization index of the winding with bushing, which shall be in accordance with the following requirements:

1 Insulation value is no less than 70% of the product works test

2 When the measured temperature is not in accordance with temperature during the product works Jest, it may converted to numerical value under the same temperature according t a table 7.0.9 and then to make comparison;

Table 7.0.9 Temperature Conversion Coefficient of Insulation Resistance of the Oil-immersed Type Power

~ = 1 5 ~ " (7.0.9-1) Insulation value being adjusted to 20'C may be calculated with the following equations:

Note: 1 K in the table is the value calculated by observed temperamre subtracting absolute value under 20%

5

1.2

When the measured temperature is more than 20°C:

Rzo=ARt (7.0.9-2) When the measured temperature is lower than 20°C:

R20=Rt/A (7.0.9-3) Where: R2001nsulation value being corrected to 20'C (Ma);

~t-~nsulation value under measured temperature ( M a )

3 Transformer with voltage of 35kV and above and capacity of 4000kVA and above shall

10

1.5

be measured with absorptance Comparing the absorptance with value of product ex works, it shall not be less than 1.3 at ordinary temperature; when %o, is larger than 3000MR, absorptance may not be made with examination requirement

4 Transfomer with voltage of 220kV and above and capacity of 120MVA and above

15

1.8

should be measured with polarization index with 5000V megger Comparing the measured value with product ex works value, it shall be without obvious difference, and it shall be no less than 1.3 at ordinary temperature; when bo, is larger than 10000MS2, polarization index may not be made with examination requirement

7.0.10 The measurement for dielectric loss tangent tan6 of the winding with bushing shall be

in accordance with the following requirements:

1 The transformer with voltage of 35kV and above, and capacity of 8000kVA and above

20

2.3

shall be measured with dielectric loss tangent tan6:

2 The measured winding tan6 shall not be larger than value of 130% of the product

works test;

3 When the measured temperature is not in accordance with temperature during the product works test, it may converted to numerical value under the same temperature according totable 7.0.10 and then to make comparison

Note: 1 K in the table is the value calculated by observed temperature subtracting absolute value under 20%;

2 Measuredtemperature is based on oil temperahlre in the upper layer;

When the measured temperature is more than 20'C:

tan6,,= tan6,IA (7.0.10-2) When the measured temperature is lower than2O0C:

Where: tan 627Dielectric loss tangent when being corrected to 20'C;

tan 6, -Dielectric loss tangent under measured temperature

7.0.11 The measurement for DC leakage current of the winding with bushing shall be in accordance with the following requirements:

1 Transformer with voltage of 35kV and above and capacity of 8000kVA and above shall

be measured with DC leakage current;

2 Testing voltage standard shall be in accordance with those specified in Table 7.0.1 1

Table 7.0.11 Voltage S t a n d a r d f o r DC Leak-off Test of the Oil-immersed T y p e P o w e r Transformer

is in accordance with standard of grade 20kY

2 Classification insulating transformers is still according to standard of the tested winding voltage grade

the winding with frequency-response method

7.0.13 AC withstand voltage test of the winding with bushing shall be in accordance with the following requirements:

1 Terminal test for transformer with capacity of below 8000kVA and rated voltage of the winding of below llOkV shall be made with withstand voltage test according to table 7.0.13-1;

2 Transformer with capacity of 8000kVA and above and rated voltage of the winding of below llOkV may be made with terminal AC withstand voltage test according to testing voltage standard specified in t a b l ~ 7.0.13-1

3 Neutral point of transformer with rated voltage of the winding of llOkV and above

shall be made with AC withstand voltage test, and the bearing voltage standard for the test is 80% of the ex-works test voltage (see table 7.0.13-2)

Table 7.0.13-1 Voltage S t a n d a r d for AC Withstand Test of the P o w e r T r a n s f o r m e r a n d Reactor k V System

Nominal voltage

Note: l l n the above table: testing voltage ofthe transformer is established by works test voltage be multiplied by 0.8 according

to current national standard "Power Transformer Part 3: Insulation Levels, Dielectric Tests and External Clearances in Air" GB 1094.3

2 Ex-works testing voltage of dry-type transformer is established by works test voltage be multiplied by 0.8 according to current national standard "Dry-type Power Transformers" GB 6450

Table 7.0.13-2 Testing Voltage S t a n d a r d for AC Withstand Voltage of Neutral P o i n t of t h e P o w e r

Transformer with Rated Voltage llOkV a n d above k V

I 550 Grounding by small

140 impedance

Neutral grounding mode

126

252

AC withstand voltage Oil-immersed type power transformer

and reactor

AC tolerant voltage ex works Indirect grounding

Direct grounding Indirect grounding

Dry type power transformer and reactor

Testing voltage frequency of the outside-applying AC voltage shall be 45-65HZ, and the tolerance time under full voltage is 60s

When making the induced voltage test, testing voltage frequency shall be a bit larger than normal frequency to prevent core saturation and exciting current oversizing Unless otherwise prescribed, when the testing voltage frequency is equal to or less than 2 times of the normal frequency, testing time under full voltage is 60s; when testing voltage frequency is larger than 2 times of the normal frequency, testing time under full voItage is:

120xnormal frequencyltesting frequency (second), but it is not less than 15 s (7.0.13-4)

7.0.14 Measure the long-term induced voltage test with partial discharge measurement of the

winding with bushing (ACLD): that with voltage of 220kV and above must be made field partial discharge test when newly installed For transformer with voltage of 1 lOkV shall be made with partial discharge when there is suspicion on the insulation

Partial discharge test method and judgement method shall comply with relevant regulations specified in current national standard "Power Transformers Part 3: Insulation Levels, Dielectric Tests and External Clearances in Air" GB 1094.3 (refer to Appendix C)

7.0.15 Impact switching-in test for the transformer under rated voltage shall be tried 5 times

Each time interval should be Smin, and it shall be without abnormal phenomena; impact switching-in should be made in high-tension side of the transformer; for electric system with neutral point grounding must be with depressor neutral point grounding when testing; transformer without operating cut-off point in the intermediate junction of the generator transformer group may not be made with impact switching-in test Dly-type transformer without electric current differential protection may be impacted three times

7.0.16 Inspect phases of the transformer, which must be concord with that of the electric network

7.0.17 Noise of the transformer with voltage of 500kV shall be measured at rated voltage and

normal frequency, the noise shall not be larger than 8OdB (A), its measuring method and requirement shall comply with "Determination of Transformer and reactor sound levels" GB/T 7328

8 Reactor and arc-suppression coil

8.0.1 The pilot project of reactor and arc-suppression coil shall include the following content:

1 Measure DC resistance of the winding with bushing;

2 Measure insulation resistance, absorptance o r polarization index of the winding with bushing;

3 Measure dielectric loss tangent tan6 of the winding with bushing;

4 Measure DC leakage current of the winding with bushing;

5 AC withstand voltage test of the winding with bushing;

6 Measure insulation resistance of fasteners insulated with iron core;

7 Insulating oil test;

8 Test of non-pure ceramic bushing;

9 Impact switching-in test under rated voltage;

10 Measure the noise;

11 Measure vibration of the tank shell;

12 ~ e a s u r e surface temperature of the tank shell

Note: 1 Pilot project of the dv-type reactor may comply with items 1,2,5 and 9 ofthis aRicle;

2 Pilot project of the arc-srrppression coil may comply with items 1,2, 5 and 6 of this article; and for oil-immersed type arc-suppression coil, it shall increase those specified in items 3,4,7 and 8;

3 Pilot project of the oil-immersed reactor may comply with items 1, 2, 5, 6, 7 and 9 of this article; and for reactor of

35kV and above, it shall increase those specified in items 3 , 4 , 8, 10, 11 and 12;

8.0.2 The measurement for DC resistance of winding with bushing shall be in accordance

with the following requirements:

1 The measurement shall be made in all the positions on the tap joints;

2 Variation law for measured value and ex works value shall be concord;

3 Differences between winding DC resistances of three-phase reactor shall not be larger

than 2% of the three-phase average value;

4 Comparing with product ex works value at same temperature, corresponding variation

of the DC resistance of reactor and arc-suppression coil shall not be larger than 2%

8.0.3 The measurement for insulation resistance, absorptance or polarization index of the

winding with bushing shall comply with article 7.0.9 of this standard

8.0.4 The measurement for dielectric loss tangent tan6 of the winding with bushing shall

comply with article 7.0.10 of this standard

8.0.5 The measurement for DC leakage current of the winding with bushing shall comply

with article 7.0.11 of this standard

8.0.6 AC withstand voltage test of the winding with bushing shall be in accordance with the

following requirements:

1 Arc-suppression coil, dry-type or oil-immersed reactor with rated voltage of above llOkV shall be made with AC withstand voltage test, and the testing voltage shall be in accordance with those specified in Table 7.0.13-1 of this standard;

2 Voltage standard of the graded insulated withstand test shall be made according to

grounding terminal or its tenninal insulated voltage grade

8.0.7 The measurement for insulation resistance of the fasteners insulated with the iron core

shall comply with those specified in article 7.0.6 of this standard

8.0.8 Insulating oil test shall comply with those specified in article 20.0.1 and 20.0.2 of this standard

8.0.9 Test of the non-pure ceramic bushing shall comply with those specified in Chapter 16 of

this standard

8.0.10 Test for shunt inductor of the substation and circuit shunt inductor with impact

switching-in of the circuit at rated voltage shall be made 5 times; the time interval is Smin, and it shall be without abnormal phenomena

8.0.11 Measurement for the noise shall comply with article 7.0.17 ofthis standard

8.0.12 Vibration amplitude double peak value of the tank shell measured at rated conditio~i for the reactor with voltage of 500kV shall not be larger than 100pm

8.0.13 Reactor with voltage of 330-500kV shall be measured with surface temperature of the

tank shell, and the temperature rise shall not be larger than 65'C

9 Instrument transformers

9.0.1 The pilot project of the instrument transformer shall include the following content:

1 Measure insulation resistance of the winding;

2 Measure dielectric loss'tangent tan6 of the instrument transformer with voltage of

35kV and above;

3 Partialadischarge test;

4 AC withstand voltage test;

5 Insulating medium property-test;

6 Measure DC resistance of the winding;

7 Inspect link group and polarity;

8 Error measurements;

9 Measure exciting characteristic curve of the current transformer;

10 Measure excitation characteristics of the electromagnetic voltage transformer;

11 Testing capacitance voltage transformer (CVT);

12 Inspect sealing property;

13 Measure insulation resistance f the iron core clamping bolt

Note: The test for current tmnsformer and bushing current transformer in sulfur hexalluoride (SF6) gas insulated switchgear

shall comply with items 1, 6, 7, 8 and 9 of this article;

9.0.2 ~ e a s u r e m e n t for insulation resistance of the winding shall be in accordance with the

following requirements:

1 Measure insulation resistance of primary winding to secondary winding and the crust,

and between secondary windings or to its crust; insulation resistance should not be less thah

1000Mn;

2 Measure insulation resistance in primary winding intersegment of the current

transformer, insulation resistance should not be less than 1000 M a , however, when it cannot

be measured by structural reasons, it may not be measured;

3 Measure insulation resistance of tip screen and voltage transformer grounding terminal

(N) of the capacitance current transformer to its crust; the insulation value should not be less

than 1000 M a If the tip screen grounding insulation resistance is less than 1000 MR, it shall

be measured with tan6;

4 Insulation resistance measurement shall be made with 2500V megger

9.0.3 The measurement for dielectric loss tangent tan6 of instrument transformer with voltage

of 35kV and above shall meet the following requirements:

1 Measuring voltage of the winding tan6 of the instrument transformer shall be measured

at IOkV, and the tan6 shall not be larger than data listed in Table 9.0.3 When there is

suspicion for the insulation, it may be tested with high-pressure process, and made within

(0.5-1) ~ m d 3 , tan6 variation shall not be larger than 0.2% and the change in capacity shall

not be larger than 0.5%;

2 Measuring voltage of the tip screen tan6 is 2kV

Note: this article is mainly applicable to oil-immersed type instrument transformer

Instrument transformer of SF6 gas insulation and epoxy insulation structure is not applicable, , and instrument transformer infusing with silicone grease may be used by referring to this

Table 9.0.3 Limitation of tang (%)

~p screen o -1mmer

Note: The spoiling of integral voltage transformer and bracket are greatly influenced by the environmental conditions (especially

relative humidity), and it shall be considered when measuring

9.0.4 Measurement for partial discharge of the instrument transformer shall be in accordance

with the following requirements:

1 Partial discharge measurement should be made go hand in hand with the AC withstand

voltage test;

2 Measurement for partial discharge of instrument transformer with voltage of

35-110kV may be measured by 10% sampling, if the partial discharge amount cannot meet

the specified requirement, it shall increase the sampling proportion;

3 When insulating property of the instrument transformer with voltage of 220kV and

above is doubtable, it should make partial discharge measurement;

4 When measuring the partial discharge, it shall monitoring apply primary voltage in

high-tension side (including induced voltage of the voltage transformer);

5 Measuring voltage and apparent discharge of the partial discharge shall be in

accordance with those data specified in table 9.0.4

2 When electromagnetic voltage transformer (including electromagnetic unit of the

capacitance voltage transformer) encounters too dense magnetism in the iron core, it should

make induced withstand voltage test according to the following specifications:

1) Induced withstand test A t a g e shall be 80% of the works test voltage

2) Time for testing supply frequency and testing voltage comply with item 4 of article <

7.0.13

3) Before and after the induced over voltage withstand test, it shall make no-load

current measurement once at rated voltage respectively, these two measured values shall be

without obvious difference by comparison;

4) Oil-immersed type instrument transformer with voltage of 66kV and above shall be

made primary insulating oil chromatographic analysis before and after induced over voltage

withstand test respectively and the two measured values shall be without obvious difference

by comparison;

5) When making the induced over voltage withstand test, it shall measure voltage in

the high-pressure side

6) When making induced over voltage withstand test for middle voltage transformer

of capacitance voltage transformer, it shall disconnect the partial pressure capacitance When

the field has no condition to be disconnected due to product structural reasons, it may not

make induced over voltage withstand test

3 SF6 gas insulating instrument transformer with voltage of above 220kV (especially for

instrument transformer with voltage of 500kV) should be made with AC withstand voltage

test after being installed;

4 Secondary windings and withstand test voltage standard to line frequency of its crust

shall be ZkV,

5 Line frequencies withstand test voltage standard of the tip screen of current

transformer with voltage of llOkV and above and grounding terminal (N) of the voltage

transformer to the ground shall be 3kV

9.0.6 Insulating medium property-test with suspicion for insulating property of the instrunlent

transformer shall be tested with property of the insulating medium, which shall be in

accordance with the following requirements:

1 Properties of the insulating oil shall be in accordance with those specified in Table

20.0.1 and Table 20.0.2 of this Standard;

2 SF6 gas property shall meet the following requirements: sampling after SF6 gas filli~lg

in the equipment for 24 hours, SF6 gas water content shall not be larger than 250pLIL

(volume fraction at 20°C)

3 Oil-immersed instrument transformer with voltage of above 66kV shall be made with

chromatographic analysis for dissolved gas in the oil Dissolved gas constituent content in the

oil (pL/L) should not exceed any of the following values: total hydrocarbon: 10: H2: 50,

value converted to the same temperature, the difference should not be larger than 15%

2 Current transformer: difference between DC resistance and average value of the

primarylseconda~y winding with current transformer belonging to the same type, same

specification and same batch shbuld not be larger than 10% When there is suspicion, it shall

improve applied measuring current, and the measuring current (DC value) should generally

not exceecl50% of the rated current (root mean square value)

9.0.8 Inspect link group and polarity of the instrument transformer, which must meet the

design requirement and shall be in line with nameplate and markings

9.0.9 Measurement for error of the instrument transformer shall be in accordance with the

followi~lg requirements:

1 Instrument transformer for col metering (including the current transformer, voltage

transformer and the combination of instrument transformer) must be made with error

measurement and institution ( laboratory) for error detection must be authorized by the

statutory national metrology institutes;

2 Instrument transformer with voltage of 35kV and above for the non-col measurement

should be made with error measurement;

3 Instrument transformer with voltage of below 35kV for non-col measurement shall be

inspected with transformation ratio for the instrument transformer, and it shall be in line with

builder's nameplate, and it may only inspect transformation ratio for the used tapping tap

joints

4 Winding not for measurement shall be made with transformation ratio inspection

9.0.10 When relay protection has requirement for the excitation characteristic of the current

transformer, it shall test the exciting characteristic curve When current transformer has

multi-tap, it may measured with working tap or the maximal tap Check whether it is conform

to the product's requirement after measurement, and the checking method sees Appendix E

9.0.11 The measurement for excitation curve of the electromagnetic voltage transformer shall

meet the following requirements:

1 Appliance for measuring excitation curve is root mean square value table, if measuring

result has great discrepancy (> 30%) with work test report and type test report, it shall check

whether the used appliance type is correct or not;

2 In general situation, measuring points of the excitation curve are 20%, 50%, 80%,

100% and 120% of the rated voltage For voltage transformer with neutral-point direct

grounding ( N terminal grounding) and voltage transformer with voltage of 35kV and below,

their maximal measuring point is 190%; and the maximal measuring point for voltage

transformer with voltage of 66kV and above is 150%;

3 Exciting current for measuring point ( 100%) of the rated voltage should not be larger

than 30% of the measured value of its routine test report and type test report, exciting current

of this point with voltage transformer of the same batch, same type and same specification

should not differ by 30%;

9.0.12 Testing for capacitance voltage transformer (CVT) shall be in accordance with the

1 Measuring result for capacitance and dielectric loss angle tan6 of the CVT condenser

divider: if variation between capacitance and the ex works value exceeds -5% or lo%, it shall

come iuto notice and tan6 shall not be larger than 0.5%; measuring single sectional capacitor

at lOkV to the scope of the rated voltage when condition permits, it is illegible when the variation of capacitance is larger than 1%

2 When CVT electromagnetic unit cannot educe the medium voltage.connecting join because of structural reasons, it must make error test; when there is suspicion for condenser divider insulation, it shall unclose electromagnetic unit and educe medium voltage join to measure capaci<ance and dielectric loss angle tan6 at rated voltage;

3 CVTerror test shall be made on the bracket (column);

4 Permitted by the electromagnetic unit construction, electromagnetic unit inspection

'includes excitation curve measurement of the intermediate transformer, inductive reactance measurement of the compensation reactor, performance checking of the damper and limiter, and the AC withstand voltage test; refers to electromagnetic voltage transformer, the applying complies with 80% of the works test

9.0.13 Sealing property inspection shall be in accordance with the following requirements:

1 outward of the oil-immersed type instrument transformer shall be without phenomena like visible oil stain;

2 If there is suspicion for qualitative leak hunting of SF6 gas insulated instrument transformer without' leakage point, it may make quantity leak hunting, and the annual leakage rate shall be less than 1%

9.0.14 Measurement for insulation resistance of the iron core clamping bolt shall be in

accordance with the following requirements:

1 When making body inspection, it shall measure exposed or touchable clamping bolt in the iron core;

2 Measure with 2500V megger: the testing time is lmin, and it shall be without flashover and punchthrough

3 One end of the core-wear bolt connecting with the iron core shall disconnect the connection strap when measuring, if it cannot be disconnected, it may not be measured

10 Oil circuit breakers

10.0.1 The pilot project of the oil circuit breaker shall include the following content:

1 Measure insulation resistance;

2 Measure dielectric loss tangent tg6 of the 35kV bulk-oil breaker;

<

3 Mequre DC leakage current of above 35kV oil-minimum breaker;

4 AC withstand voltage test;

5 Measure galvanic circle resistance of each phase;

6 Measure switching-off and switching-in time of the oil circuit breaker;

7 Measure switching-off and switching-in velocity of the oil circuit breaker;

8 Measure switching-off and switching-in synchronism for main contact of the oil circuit

breaker;

9 Measure input time and resistance value of the switching-in resistance of the oil circuit

breaker;

10 Measure insulation resistance and DC resistance of switching-offJswitching-in coil

and switching-in contactor coil of the oil circuit breaker;

11 Control mechanistic test of the oil circuit breaker;

12 Voltage-sharing capacitor test of the breaker;

13 Insulating oil test;

14 Inspect pressure gauge and pressure firing level

10.0.2 Measurement for insulation resistance shall be in accordance with the following

requirements:

1 Measurement for integral insulating resistance value shall refer to the provisions

specified by the builder;

2 Insulation resistance of the insulating drawbar shall not be less than those specified in

Table 10.0.2 at ordinary temperature

accordance with the following requirements:

1 The measured value tan6 at twentyeC shall not be larger than that of corresponding

bushing tan6 (%) plus 2 specified in table 16.0.3 of this standard for DW2 and DW8 type oil

circuit breaker, and it shall not be larger corresponding bushing tan6 (%) plus 3 specified in

table 16.0.3 of this standard for DWltype oil circuit breaker;

2 It shall measure tan6 of each bushing under switching-off state When the measured

value exceeds the standard, it shall make decomposition run after discharging the tank, by

then, the measured bushing tan6 (%) shall be in accordance with those specified in table

16.0.3 of this standard

10.0.4 Voltage for strut housing of oil-minimum breaker above 3SkV with insulating drawbar

and DC leakage current test of fractures of the quenching pot is 40kV, and it shall read lmin t leakage current in high-tension side, and the measured leakage current shall not be larger than

lo@; for those of 220kV and above, the leakage current should not be larger than 5pA

10.0.5 AC withstand voltage test of the breaker shall be made under the switching-off and

Table 10.0.2 Insulation Resistance Standard for Insulating Drawbar

330-500 63-220

switching-in state respectively, and the testing voltage is in accordance with those specified in

Table 10.0.5

Note: lData listed in the table is quoted from "Common Specifications for HV Switchgear" DLiT 593-1996;

2 When there is no special regulation, it adopts testing voltage of the maximal level

10.0.6 Measurement for galvanic circle resistance of each phase shall be in accordance with

the following requirements:

1 Measure with DC pressure drop method with electric current of no less than 100A, and

the resistance value shall be in accordance with the product technical conditions:

2 Breaker with main contactor and quenching contactor parallel shall be measured with

galvanic circle resistance of the main contactor and quenching contactor

10.0.7 Measurement of the switching-off and switching-in time of the breaker shall be carried

out at rated control voltage and hydraulic pressure of the products Measured value shall be in

accordance with the product technical condition

10.0.8 Measurement of switching-off and switching-in velocity of the breaker shall be in

accordance with the following requirements:

1 Measurement shall be made at rated control voltage and hydraulic pressure of the

product, and the measured value shall comply with those specified by the product technical

condition; if the product has no requirement, it may not be made;

2 Among breakers with voltage of 15kV and below, only the generator off-track breakers

and breakers connecting with main bus-bar of the generator as well as the main transformer

off-track breakers shall be made with velocity measurement, the rest may not be measured

10.0.9 Measurement for synchronism of the three-phase or in-phases' fractures switching-off

and switching-in of the breaker main contactor shall be in line with the product technical ,

condition

10.0.10 Measurement for input time and resistance value of the switching-in resistance of

circuit breaker shall comply with those specified by the product technical condition

Table 10.0.5AC Withstand Voltage Test Standard of the Breaker

Rated voltage kV Maximum working

voltage kV

Peak value of 1 min frequency tolerant voltage kV

isolating frachlre Relatively Alternate with Breaker frachlre

10.0.11 Ins'ulation value of the switching-oflswitching-in coil and switching-in contactor coil

shall not be less than lOMR, DC resistance and product works test value shall be without

obvious difference

10.0.12 Control mechanistic test for the breaker shall be in accordance with the following

requirements:

1 switchhg-in operation

1) When control voltage and hydraulic pressure is within the scope specified in table

10.0.12-1, the control mechanism shall he with reliable movement;

Table 10.0.12-1 Voltage a n d H y d r a u l i c P r e s s u r e Scope of t h e Switching-in O p e r a t i o n Test of the Control

Mechanism of t h e B r e a k e r

Hydraulic pressure Specified lowest and highest values according to product

is (80%-110%) Un Un is voltage under rated power supply

2) Movement requirement for switching-in coil of the spring and hydraulic pressure

control mechanism as well as electromagnetic control mechanism shall meet the above

requirements

2 Release operation

1) When the measured voltage at coil terminal button of the DC or AC switching-off

electromagnet is larger than 65% of the rated value, it shall switching-off reliably; when this

voltage is less than 30% of the rated value, it shall not be switching-0%

2) Performance characteristic of the on-load no-voltage release shall be in accordance

with those specified in Table 10.0.12-2;

Table 10.0.12-2 Release Test of t h e On-load No-voltage Release Ratio between supply voltage and rated

power supply voltage

Working order of no-voltage relcase

Note: * when voltage drops to the specified ratio slowly, iron core shall be released reliably

3) Rated current of on-load over-current release is set to be no less than 2.5A, grade

scope and precision of the tripping current shall be in accordance with those specified in table

10.0.12-3

Table 10.0.13-3 Release Test of t h e On-load No-voltage Release

instantaneous action Types of the over-current release Deferred action

Gmdds scope of the tripping current (A)

Precision of each grade of tripping current

Precision of all levels of tripping current of the

same level of release

Note: for over-current release of deferred action, it shall be checked according to tripping current provided by the builder and 8 relation curve of the action delay In addition, it shall inspect the main circuit electric current when dropping to the retllrn

value, and the release shall not be acted before the engaged delaying time

3 Control test simulation

+lo%

+5%

1) When it is provided with moving power supply, it may make in-situ or far-controlled

operation for breaker under different voltage and hydraulic pressure condition, and evely time,

the operating breaker shall be correct and reliably acted, action of its interlock and blocking

device circuit shall meet the product and design requirements; when there isn't moving power

supply, it may on)y be tested under rated voltage

2) Control test of the DC electromagnetic or spring mechanism shall be made according

to those specified in table 10.0.12-4; control test of hydraulic mechanism shall be made

according to those specified in table 10.0.12-5

Table 10.0.12-4 Control Test of D C Electromagnetic or S p r i n g Mechanism

3 Allowable value of the hydraulic pressure drop when being controlled shall comply with those specified by the product

Note: Figurer in the parentheses are applicable to breaker installed with automatic reclosing device and conditions specified in

"note 1"of 10.0.12-1

Table 10,0.12-5 Control Test of t h e Hydraulic Mechanism

Mayimum working pressure specified

Lowest operating pressure specitied by

Lowest operating pressure specified by

Note: 1 Figures listed in the parentheses are applicable to breaker installed with automatic reclosing device

2 Conmol test simulation shall be made under exact and reliable action state of the hydraulic automatic control loop

function properly, it shall be treated with input or exit as required

10.0.13 Voltage-sharing capacitor test of the breaker shall be in accordance with relevant

Operating hydraulic pressure Operating type

regulations specified in Chapter 19 of this standard

10.0.14 Insulating oil test shall be made according to those specified in Chapter 20 of this standard For breakers with oil way like quenching pot and strut housing insulating one another, it shall be sampiing oil from all the components respectively to be tested

10.0.15 Pull-on value of thfc pressure firing level shall be in accordance with the product technical condition; error and variation of indicated value of the pressure gauge shall be within the permissible error scope of the corresponding grade of the product

11 Air and magnetic blast breaker

11.0.1 The pilot project of the air and magnetic blast breaker shall includc the following

content:

1 Measure insulation resistance of the insulating drawbar;

2 Mea~ure galvanic circle resistance of each phase;

3 Measure DC leakage current of each fractures of the strut housing and quenching pot;

4 AC withstand voltage test;

5 Measure the cooperated time of switching-off and switching-in for main and assistant

contactor of the breaker;

6 Measure switching-off and switching-in time of the breaker;

7 Measure switching-off and switching-in synchronism for main contactor of the

breaker;

8 Measure insulation resistance and DC resistance of the switching-off and switching-in

coil;

9 Control mechanistic test of the breaker;

10 Measure parallel resistance of the breaker;

11 Test of capacitor of the breaker;

12 Inspect pressure gauge and pressure fuing level

Note: 1 Suicide contactor of the generator excitation circuit shall not only test those specified in item 8 and 9, but also shall

make the following inspection and test: normally open, normally closed contact points, switching-oWswitching-in sequence;

action cooperation between the main contactor and quenching contactor; arc chute pieces number and its parallel resistance;'

make demagnetization test under no-load rated voltage of the synchronous generator;

2 Magnetic blast breaker tests shall comply with items 2 , 4 , 6 , 8 and 9 ofthis article

11.0.2 Measurement for insulation resistance of the insulating drawbar shall not be less than

those specified in Table 10.0.2 of this standard

11.0.3 Measurement for resistance value and testing method of phases of galvanic circle shall

comply with those specified by the product technical condition

11.0.4 Test for DC leakage current of each fracture of the strut housing and quenching pot

shall comply with those specified in Article 10.0.4 of this standard

11.0.5 Air circuit breaker shall make AC withstand voltage test among fractures and under

switching-in state during the switching-off process; magnetic blast breaker shall make

fracture AC withstand voltage test under switching-off state; testing voltage shall be in

accordance with those specified in Table 10.0.5

11.0.6 Switching-offlswitching-in motion procedure and cooperated time of the main and

assistant contactors of the breaker shall comply with those specified by the product technical

condition

11.0.7 Measurement for switching-off and switching-in time of the breaker shall he made

under rated control voltage of the product and air pressure, and the measured value shall

comply with those specified by the product technical condition

11.0.8 Measurement for synchronism of the three-phase or in-phases' fractures switching-off

I

and switching-in of the breaker main contactor shall comply with those specified by the

product technical condition

11.0.9 Measurement for insulation value of the switching-off and switching-in coil shall not