User manual KYN 28A24(Z)

The switchgear is provided with five interlocking protective functions to protect from pushing and pulling breaker handcart with charge, to protect from turning the breaker on and off by

Metal-clad movable type metal-enclosed switchgear Installation and Instruction Manual

KYN28A-24(Z)

3 Service Conditions

4 Main Technical Parameters

5 Structural Characteristics of product

6 Wiring scheme of main circuit

7 Exterior installation dimensions

8 Installation and debugging

9 Use and maintenance

10 Attentions in maintenance of switchgear cabinet

11 Transportation and storage

12 Attached documents and spare parts

13 After service

1 2 2 6 9 11 12 15 15 16 16

KYN28A-24(Z)

Metal-clad movable type metal-enclosed switchgear

1 General

KYN28A-24(Z) Metal-clad movable type metal-enclosed switchgear ( hereinafter referred to as "the switchgear" ) is a

complete power distribution equipment with 20 kV three-phase AC 50 (60) Hz single busbar and single busbar

segment system

It is mainly used in the power transmission of power plant and medium and small scale power generator, power

distribution of industrial mining corporations, power acceptance and transmission of secondary substation, and the

startup of large scale high-voltage power generator to protect and monitor the system

The switchgear is provided with five interlocking protective functions to protect from pushing and pulling breaker

handcart with charge, to protect from turning the breaker on and off by mistake, to protect from turning off the breaker

when the grounding switch is off, to protect from entering the charged compartment by mistake and to protect from

turning on the grounding switch with charge by mistake It can be used together with the NV1-24 vacuum breaker

developed by our company alone It is really an excellent distribution equipment

The product conforms to the standards of GB 3906-2006 (IEC 62271-200, MOD), GB/T 11022-1999 (IEC 60694-1996,

MOD) and IEC 60298

2 Types and Meanings

Environmental characteristic Number of scheme Rated short-circuit breaking current Rated current

Vacuum breaker Rated voltage Design number For indoor use Movable Metal-clad

K Y N □ － 24 (Z) / □－□ □ □

3 Service Conditions

3.1 Ambient temperature: - 15℃～+40℃

3.2 Altitude: no higher than 1000 m

3.3 Relative humidity: mean daily relative humidity should not be higher than 95%,

mean monthly relative humidity not be higher than 90%

3.4 Seismic intensity: generally not above 8

3.5 To be put in the places without fire, explosive risk, serious dirt, chemical corrosion and great vibration

3.6 When the switchgear is used in the conditions other than the normal conditions specified by GB3906,

please contact us

KYN -24(Z)

4 Main technical parameters

No

1

2

3

4

5

6

7

8

9

10

11

kV kV kV Hz A kA kA s

kg

Data 24 (50)65 125 50(60) 630、1250、1600、2000、2500、3150 630、1250、1600、2000、2500、3150 16、20、25、31.5

40、50、63、80 4

1000 A

Rated voltage

1 min power-frequency withstand voltage

Rated impulse withstand current (peak)

Rated frequency

Rated current

Rated current of branch busbar

Rated short-time withstand current

Rated peak withstand current

Rated short-circuit duration

Weight

IP4X for outer shell, IP2X when compartment door and breaker compartment door is open

Table 1

Degree of protection

5 Structural Characteristics of product

5.1 Safe structure and flexible installation

The switchgear is composed of cabinet and central movable part (i e handcart) The cabinet is composed of four independent compartments The protection degree of the outer shell is IP4X When the door of the breaker compartment

is open, the protection degree is IP2X There are overhead inlet and outlet wires, cable inlet and outlet wires and other functional schemes It can form various distribution equipments through arrangement and combination You can debug and maintain the switchgear with the cable compartment, which improves the safety and flexibility of the switchgear and reduces the covering area

Figure 1 Structure of the switchgear

1820 2150

Depth of cabinet (mm) Cable outlet wire

Overhead inlet and outlet wire

A A A

4

3

2

1

8

9

7

6 5

13

15 14 12

10

11

KYN -24(Z)

C

A

A Busbar compartment

B Breaker compartment

C Cable compartment

D Relay compartment

1 Wall sleeve

2 Analog primary figure

3 Nameplate

4 Lighting

5 Main busbar

6 Contact box

7 Current transformer

8 Primary cable

9 Grounding busbar

10 Secondary interlocking equipment

11 Valve mechanism

12 breaker handcart

13 Insulator

14 Heater

15 Grounding switch

5.2 Handcart

The frame of the handcart is composed of light steel plate processed by CNC machine and assembled The handcart is insulated from the cabinet The mechanical interlocking is safe, reliable and flexible According to the purpose, the handcarts can be divided into breaker handcart, voltage transformer handcart, measuring handcart and separating handcart The handcarts with the same type can be completely exchanged The handcarts have testing positions and working positions in the cabinet Each position is provided with positioning device to guarantee the reliable interlocking It must be operated in the interlocking protection process The handcarts are all pushed and pulled with lead screw It is easy and flexible to operate and suitable for the operation of various operators When the handcart is to separate from the cabinet, a small size special transfer trolley will be used to make it easy to perform inspection and maintenance

There are vacuum breakers and other supporting equipments on the breaker handcart When the transfer trolley for the handcart enters the breaker compartment of the cabinet, it can be reliably locked in the off position (testing position) Meanwhile, turn on the secondary circuit, and the indicator of handcart position will show the position of the handcart And only after complete locking, can the mechanism be pushed and the handcart be pushed to the working position When the handcart reaches the working position, the handle cannot be pushed, and the corresponding indicator of position will show the position The mechanical interlocking function of the handcart can reliably make sure that the breaker can be turned on only when the handcart is in the working position or testing position (exit position), and the handcart can move only when the breaker is in the off position

5.3 Compartment

The main electric elements of the switchgear are all in the independent compartments, that is, breaker handcart compartment, busbar compartment, cable compartment and relay instrument compartment The protection degree

of the compartments is IP2X Except the relay compartment, the other three compartments are all provided with pressure relief passage As the central embedding form is used, the passage for equipment maintenance is added, and more positions of cable compartment are needed, so the equipment can connect multiple cables

5.3.1 Breaker compartment B

Rails are installed at both sides of the compartments to make it easy

for the handcart 17 to move from the breaking position/testing

position to the working position in the cabinet The static contact box

6 and separating board 19 (valve) are installed on the rear wall of the

rear handcart compartment When the handcart moves from the

breaking position to the working position, the valve of the upper and

lower static contact box will link with the handcart can open

automatically When the handcart moves in the counter direction, the

valve will be closed automatically Till the handcart goes back to a

certain position and cover the static contact box completely, it is

effectively separated Meanwhile, as the upper and lower valves do

not link with each other, the valve at the charged side can be locked

in maintenance to make sure that the maintainer will not contact the charged members (See figure 2) When the breaker compartment is closed, the handcart can still be operated The position of handcart, indication of on and off position, and the energy storage can be observed from the excess panel of the upper door

5.3.2 Busbar compartment A

The main busbars connect and link with each other They are fixed with sleeve and static contact box The main busbars and linkage busbars are the busbars with rectangle sections When carrying large current load, two combined busbars are used The branch busbars are connected to the static contact box 6 and the main busbars with bolts, and no other supports are needed For special requirements, the busbars are covered with thermal shrinkage box and connecting end face insulating cover (See figure 3) The busbars of adjacent cabinets are fixed with sleeve 3 Then the air buffer retained between the connecting busbars will protect it from melting when the internal fault arc occurs The sleeve 3 can effectively separate the fault and prevent it from spreading

Figure 2 Valve mechanism

Figure 3 The connecting form of busbar and branch busbar and installation form ofthermal shrinkage sleeve and insulating cover

Insulating cover

Thermal shrinkage sleeve

5.3.3 Cable compartment C

The switchgear is of the central embedding form, so the space of cable compartment is large The current transformer 7 and grounding switch 8 is installed on the rear wall of the compartment Move the handcart 17 and movable central separating board 15 (See figure 4), and the constructor can install and maintain the equipment from the front The cable connecting conductor in the cable compartment can be connected to 1~3 single-core cables for each phase according to the scale of the current It can be connected to 6 single-core cable for each phase when necessary The cabinet bottom of the connecting cables is provided with slitting removable metal clad or non magnetic conducting metal clad and rubber seal cover for sealing the cable so as to make it easy, safe and reliable

to construct

5.3.4 Relay instrument compartment

The relay instrument compartment can be installed with relay protective elements, instruments, electric indicators and secondary equipments for special requirements The control wires are laid in the wire duct with enough space, and the metal cover is equipped to separate the secondary wires from the high voltage compartment The left wire duct is preformed for leading in and out the control string cables The string cables inside the switch cabinet are laid

at the left The through holes for little busbars easy for construction are also preformed on the top board of the relay compartment When connecting the wires, the top cover of instrument compartment can be turned over to make it easy to install the little busbars

5.4 Interlocking device to prevent from mishandling

The safe and reliable interlocking device is installed in the switchgear to satisfy requirements of the five protective functions

5.4.1 The indicative button or KK type switch is installed on the instrument compartment to prevent from turning on and off the breaker by mistake

5.4.2 The breaker can be turned on and off only when the handcart of the breaker is in the testing or working position And after the breaker is turned on, the handcart can not be moved to prevent from pushing and pulling the breaker with charge by mistake

5.4.3 The breaker handcart can move from the testing / breaking position to the working position only when the grounding switch is in the off position The grounding switch can be turned on only when the breaker handcart is in the testing / breaking position (the grounding switch can be provided with indication device) In such way, it can prevent from turning on the grounding switch with charge by mistake and turning on the breaker when the grounding switch is on

5.4.4 When the grounding switch is off, the lower door and rear clad can not be opened to prevent from entering the charged compartment by mistake (Figure 5)

Figure 4 Removing

method of horizontal clad

Figure 5 Interlocking of grounding switch and rear clad

Figure 6 Interlocking mechanism

of secondary plug-in units

5.4.5 Besides, latching electromagnet should be installed in the handcart according to the requirement so that it can only turn on the switch manually but not turn off the switch when there is no control voltage

5.4.6 When the breaker handcart is in the working position, the secondary plug (figure 6) will be locked and cannot

be removed

5.4.7 The electric interlocking device can be installed in the cabinets

The electromagnetic locking device can be installed in the operating mechanism of grounding switch in the present switchgear to enhance the reliability The order can be chosen according to the requirement of the user

5.5 Pressure relief device

There are pressure relief devices above the breaker handcart compartment, busbar compartment and cable compartment When the breaker or busbar has internal arcing fault, the internal pressure of the cabinet will increase with the arc The special seal ring installed on the door will close the cabinet in the front, and the pressure relief metal board installed on the top will be opened automatically to relieve pressure and discharge gas so as to guarantee the safety of operator and cabinet

5.6 Position interlocking of secondary plug and handcart

The connection between the secondary wire on the switchgear and the secondary wire of the breaker handcart is realized with the manual secondary plug The dynamic contact of the secondary plug is connected to the breaker handcart with a nylon expansion bellows The secondary static contact seat is installed in the right upper part of the handcart compartment of the cabinet The secondary plug can be plugged in and removed only when the breaker handcart is in the testing / breaking position When the breaker handcart is in the working position, the secondary plug is locked and cannot be removed due to the mechanical interlocking

Besides, the closing latching electromagnetic lock can be installed according to requirement so that the closing mechanism of the breaker handcart will be locked by the electromagnet The breaker handcart can only be turned off but not turned on before turning on the secondary plug

5.7 Electric indication device

If it is required by the user, an electric indication device can be installed in the cabinet to inspect the operating condition of the primary circuit The device is composed of the high-voltage sensor and portable indicator, integrated with conducting wire The device can not only indicate whether the high-voltage circuit is charged but also realize the forced latching with the electromagnetic lock so as to prevent from turning off the grounding switch with charge and entering the charged compartment by mistake, thus enhancing the mistake-proofing performance

of the supporting products

5.8 Condensation prevention

In order to prevent the risk of condensation in the environment with high humidity or great variation of temperature, heaters are installed in the breaker and cable compartments respectively to prevent condensation The temperature and condensation monitoring sensing device can also be installed along with the heater to realize automatic monitoring

5.9 Grounding device

The primary grounding copper busbar of corresponding specification is installed independently in the cable compartment This busbar can get through all the adjacent cabinets and well contact with the cabinet The grounding busbar is used by the direct grounding elements Moreover, as the whole cabinet is jointed with aluzinc or steel plate, the whole cabinet is in the good grounding condition to guarantee the safety of the operators contacting the cabinet

6 Wiring scheme of main circuit

1000X1820X2300

Vacuum breaker

Current transformer

Voltage transformer

High-voltage fuse

Grounding switch

Arrester

Purpose

Remarks

630~3150A 1000X1820X2300 1000X1820X2300 1000X1820X2300

1 2~3

Power receiving and feeding

1 2~3

Power receiving and feeding 3

1 2~3

Power receiving and feeding 1

1 2~3

Power receiving and feeding

1 3

Dimensions of cabinet

(width x depth x height) mm

Rated current (A)

No of scheme

Dimensions of cabinet

(width x depth x height) mm

Rated current (A)

Vacuum breaker

Current transformer

Voltage transformer

High-voltage fuse

Grounding switch

Arrester

Purpose

Remarks

No of scheme

Dimensions of cabinet

(width x depth x height) mm

Rated current (A)

Vacuum breaker

Current transformer

Voltage transformer

High-voltage fuse

Grounding switch

Arrester

Purpose

Remarks

630~3150A 1000X1820X2300 1000X1820X2300 1000X1820X2300 1000X1820X2300

1 3

3 Power receiving and feeding

1 3

Power receiving and feeding

1 2 3

1 3

Power receiving and feeding

1 3

Separation

1000X1820X2300 1000X1820X2300

3 Measuring voltage

3 3

Measuring voltage

2~3 3 3

630~3150A

1000X1820X2300 1000X1820X2300

Separation of busbar couple Measuring voltage

2~3 3