BRITISH STANDARD BS EN 50216 2 2002 Incorporating Amendment No 1 Power transformer and reactor fittings — Part 2 Gas and oil actuated relay for liquid immersed transformers and reactors with conservat[.]
Trang 1BRITISH STANDARD BS EN
50216-2:2002
Incorporating Amendment No 1
Power transformer and
reactor fittings —
Part 2: Gas and oil actuated relay for
liquid immersed transformers and
reactors with conservator
The European Standard EN 50216-2:2002, with the incorporation of
amendment A1:2002, has the status of a British Standard
ICS 29.120.70; 29.180
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Trang 2This British Standard, having
been prepared under the
direction of the
Electrotechnical Sector Policy
and Strategy Committee, was
published under the authority
of the Standards Policy and
Strategy Committee on
12 April 2002
© BSI 4 November 2003
ISBN 0 580 39499 9
National foreword
This British Standard is the official English language version of
EN 50216-2:2002, including amendment A1:2002.
The UK participation in its preparation was entrusted to Technical Committee PEL/14, Power transformers, which has the responsibility to:
A list of organizations represented on this committee can be obtained on request to its secretary.
Cross-references
The British Standards which implement international or European
publications referred to in this document may be found in the BSI Catalogue
under the section entitled “International Standards Correspondence Index”, or
by using the “Search” facility of the BSI Electronic Catalogue or of British
Standards Online.
This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application.
Compliance with a British Standard does not of itself confer immunity from legal obligations.
interpretation, or proposals for change, and keep the UK interests informed;
promulgate them in the UK.
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover.
The BSI copyright notice displayed in this document indicates when the document was last issued.
Amendments issued since publication
Trang 3EUROPEAN STANDARD EN 50216-2
January 2002
NORME EUROPÉENNE + A1
EUROPÄISCHE NORM
CENELEC
European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members
Ref No EN 50216-2:2002+A1:2002 E
ICS 29.120.70; 29.180
English version
Power transformer and reactor fittings Part 2: Gas and oil actuated relay for liquid immersed transformers and
reactors with conservator
(includes amendment A1:2002)
Accessoires pour transformateurs
de puissance et bobines d'inductance
Partie 2: Relais de protection
(dégagement gazeux, niveau d'huile)
pour transformateurs et réactance
immergés dans un diélectrique liquide
équipés d'un conservateur
(inclut l’amendement A1:2002)
Zubehör für Transformatoren und Drosselspulen
Teil 2: Buchholzrelais für flüssigkeitsgefüllte Transformatoren und Drosselspulen
mit Ausdehnungsgefäß (enthält Änderung A1:2002)
This amendment A1 modifies the European Standard EN 50216-2:2002; it was approved by CENELEC on 2002-11-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member
This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom
Trang 4Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 14, Power transformers
The text of the draft was submitted to the formal vote and was approved by CENELEC as
EN 50216-2 on 2001-09-25
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2002-10-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-10-01
EN 50216-2 is to be read in conjunction with EN 50216-1
Foreword to amendment A1
This amendment was prepared by the Technical Committee CENELEC TC 14, Power
transformers
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A1 to EN 50216-2:2002 on 2002-11-01
The following dates were fixed:
- latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-11-01
- latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2005-11-01
Trang 5– 3 – EN 50216-2:2002
Contents
Page
1 Scope 4
2 Normative references 4
3 Service conditions 4
3.1 Maximum inclination 4
3.2 Operating pressure 4
3.3 Sensitivity of the relay contacts to magnetic fields 5
3.4 Special mechanical conditions 5
4 Dimensions 5
5 Operational performance 7
5.1 Alarm and trip contacts 7
5.2 Oil loss from tank 8
5.3 Latching of trip element 8
6 Electrical characteristics of switch 8
6.1 Switch type 8
6.2 Rated currents 8
6.3 Breaking and making capacity 8
7 Mechanical requirements 9
7.1 Terminal box 9
7.2 Testing facility 9
7.3 Gas sampling 9
7.4 Draining device 9
7.5 Presence of gas in the relay 9
7.6 Mounting arrangement 9
7.7 Pressure and vacuum 9
8 Nameplate 10
9 Tests 10
9.1 Routine tests 10
9.2 Type tests 10
Trang 61 Scope
EN 50216-2 covers the gas and oil actuated relay (Buchholz relay) for liquid immersed power transformers and reactors with conservator for indoor or outdoor installation
The device is intended to detect
– gas release from the unit to be protected,
– oil surge from the tank to the conservator,
– complete loss of oil in the conservator
This part of EN 50216 defines the
– operating limits,
– dimensions,
– operational performance,
– electrical characteristics,
– dynamic characteristics
It applies to relays with dry contacts
It is not applicable to flameproof relays
Should environmental conditions and dynamic stress requirements differ from those detailed in clause 3 of EN 50216-1, EN 50216-2 may then be applied by agreement between purchaser and supplier for those parts which are not affected by such abnormal installation conditions
NOTE EN 50216-2 may be used as far as applicable for relays with mercury switches Restrictions on the use of mercury devices may be imposed by national regulations
2 Normative references
Addition to EN 50216-1:
EN 60947-5-1
+ A12
1997
1999
Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching elements - Electromechanical control circuit devices (IEC 60947-5-1:1997)
ISO 228-1 1994 Pipe threads where pressure-tight joints are not made on the
threads - Part 1: Dimensions, tolerances and designation
3 Service conditions
In addition to the service conditions specified in EN 50216-1, the relay shall meet the following conditions
3.1 Maximum inclination
The relay is intended to function in a horizontal position; a positive inclination of up to 5 ° to the horizontal axis is admissible in the arrow direction (see 7.6)
Other values may be agreed between purchaser and supplier
3.2 Operating pressure
The relay is subjected to a continuous internal gauge pressure of 50 kPa but shall be capable
of withstanding an overpressure of 250 kPa for 2 min
Trang 7– 5 – EN 50216-2:2002
3.3 Sensitivity of the relay contacts to magnetic fields
The relay shall be able to withstand a d.c magnetic field up to 25 mT, in any direction and any polarity, without inadvertent operations
NOTE During operation or in event of faults, the surroundings of the transformers or reactors are subjected to magnetic fields which could produce inadvertent operation of the relay equipped with magnetic contacts (reed type)
3.4 Special mechanical conditions
The mechanical stresses according to the classification of EN 60721-3-4, which shall not produce inadvertent operation of the relay, are
− for stationary sinusoidal vibration: class 4M4 or, by agreement between purchaser and supplier, class 4M6,
− for non stationary vibration: a vertical shock of 100 m/s², with type 1 spectrum, shall apply for both classes
4 Dimensions
Tables 1 and 2 are to be read with Figures 1 and 2
Table 1 – Preferred dimensions of relay in mm
L Nominal
diameter
Dn
A max
B max
C max
D a min Short type Long type E b
25 c 205 75 275 300 200 240 190
50 205 90 275 300 195 240 220
80 220 100 275 400 195 240 220
100 220 110 275 400 220
a
Minimum clearance to remove the mechanism from the body of the relay.
b
Minimum clearance for mounting and access to the relay.
c For nominal diameter 25 mm thread connections G1 ½ A (ISO 228-1) are allowed with L = 185 mm (see Figure 2).
Table 2 – Flange dimensions of relay in mm
N° of bolt holes Nominal
diameter
Dn
d1 d2 d3 d4
Short type Long type
d5 max
25 25 115 85 14 4 4 16
50 50 165 125 18 4 4 18
80 80 200 160 18 8 4 18
100 100 220 180 18 8 18
Trang 8Figure 1 – Dn 25 to 100 with round flanges
Figure 2 – Dn 25 with threaded connections
Alternative dimensions following Tables 3 and 4 may be agreed between purchaser and
supplier
Table 3 – Other dimensions of relay in mm
Nominal diameter
Dn
A max
B max
C max
D1 a
min L E
b
25 180 140 320 200 127 315
50 170 150 320 200 184 315
80 170 150 320 200 184 315
a Minimum clearance for access of petcocks.
b Minimum clearance for mounting and access to the relay.
Trang 9– 7 – EN 50216-2:2002
Table 4 – Alternative flange dimensions of the relay in mm
Nominal diameter
Dn
d1 d2 d3 d4
N° of bolt holes
d5 max
25 25,4 76-sq 72 M10 4 N/A
50 50,8 139 110 11,1 6 14
80 76,2 160 130 11,1 6 14
Dimensions for rectangular flanges are given in Figure 3
Figure 3 – Gas and oil operated relay with rectangular flanges
for nominal diameter of 80 mm
5 Operational performance
5.1 Alarm and trip contacts
This device shall be provided with two electrical contacts
The alarm contact shall operate due to a gas displacement (volume of gas collected between
100 cm³ and 300 cm³ or 400 cm³)
Gas shall not freely pass from the relay body and escape into the pipework before the contact has operated
The trip contact shall operate at a steady oil flow as indicated in Table 5
This operation shall not be adversely affected when the alarm contact has already closed and gas is escaping freely
Trang 10Table 5 – Steady oil flow for relay operation
Oil pipe connection internal diameter
mm
Steady oil flow for relay operation
m/s
Tolerance
%
80 1 or 1,5 or 2 ± 15
Other values may be agreed between purchaser and supplier
The relay shall be insensitive to oil flow from conservator to tank
The relay shall be insensitive to the oil flow generated when the transformer is submitted to an
external short circuit
The relay shall operate within 0,5 s
5.2 Oil loss from tank
The alarm element shall operate if the oil level in the relay drops by the same volume as for gas
collection
Further oil loss shall cause the trip element to operate before the relay pipework is free of oil
5.3 Latching of trip element
By agreement between purchaser and supplier, a device can be provided which holds the trip
element in the position after an oil flow operation until it is reset
6 Electrical characteristics of switch
This device is based on EN 60947-5-1
6.1 Switch type
The purchaser shall specify whether the switch shall have normally open, normally closed or
change over contacts (normally means the relay filled with oil and without any fault on the
protected equipment)
6.2 Rated currents
The rated current shall be 2 A r.m.s and the short time current 10 A r.m.s for 30 ms
Other values may be agreed between purchaser and supplier
6.3 Breaking and making capacity
Table 6 – Breaking capacity (NO and NC contacts) Voltage Current Breaking capacity
24 V d.c to 220 V d.c 2 A 250 W L/R < 40 ms
230 V a.c 2 A 400 VA cos ϕ > 0,5
Trang 11– 9 – EN 50216-2:2002
Other values may be agreed between purchaser and supplier
The minimum contact life shall be 1 000 operations
The switch shall also be able to make a low current down to 10 mA for any value of voltage defined in Table 6 even after one year of non-operation
7 Mechanical requirements
7.1 Terminal box
A terminal box shall be provided with a minimum of four terminals and one earth terminal
The terminals shall be designed to accept cables having a cross sectional area of between 1,5 mm² to 4 mm² The thread shall be minimum M5
It shall be possible to fit two cable glands on the connection box
The thread for the cable glands should be either Pg 16 or M20 x 1,5 (to be agreed between supplier and purchaser)
A minimum of one cable gland and a threaded hole for mounting the second cable gland shall
be provided unless otherwise agreed
The marking in the terminal box shall comply with that on the connection diagram
7.2 Testing facility
The relay shall be provided with a device to check the operation of alarm and trip contacts independently (without damaging the contacts or their operating mechanism)
7.3 Gas sampling
The relay shall be fitted with a gas sampling petcock
A facility shall be provided for the connection of a 3,17 mm (1/8’’) tube for sampling at ground level
7.4 Draining device
A draining device shall be provided
If required, a provision shall be allowed to permit draining at ground level
7.5 Presence of gas in the relay
It shall be possible to visually check the presence of any gas in the relay from both sides
If required, the sight glass shall be calibrated to indicate the volume of gas collected
7.6 Mounting arrangement
An arrow on the relay shall indicate the oil flow direction from the transformer tank to the conservator
7.7 Pressure and vacuum
The relay shall withstand all pressure and vacuum test stresses (see 9.1.1 and 9.2)
Trang 128 Nameplate
The nameplate shall contain the following information:
– name of supplier;
– number of this standard and year of edition;
– type of relay;
– connection diagram (it may be incorporated on the nameplate or included in the terminal box);
– state of contacts: normally open, normally closed or change over contacts;
– seismic withstand class
The type of relay shall allow identification of the relay characteristics from the mounting, operating and maintenance manual supplied by the supplier
9 Tests
In addition to the tests specified in EN 50216-1, the following tests shall be carried out
9.1 Routine tests
9.1.1 Oil leakage test
The relay shall be subjected to an oil leakage test using one of the three following methods, at the choice of the supplier:
a) application of a gas pressure of 2,5 × 105 Pa for 2 min at ambient temperature;
b) application of a pressure of 1 × 105 Pa for 30 min to the relay filled with oil at 90 °C;
c) application of a pressure of 1,4 × 105 Pa for 6 h to the relay filled with oil at ambient temperature
The relay shall not leak
9.1.2 Operation test
- Correct operation of the relay shall be checked by means of the test device and by emptying the relay
- The relay unit shall be emptied of oil and the volume to operate the alarm contact checked and the value recorded on the test report
- The minimum steady oil flow for operation of the trip contact of the relay shall also be checked as specified in Table 5
9.2 Type tests
9.2.1 Calibration of gas collection scale on relay window to operate alarm contact if required