1、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 conservator The European Standard EN 50216-2:2002, with the incorporation of amendment A1:2002, has the statu
2、s of a British Standard ICS 29.120.70; 29.180 BS EN 50216-2:2002 This 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 Novem
3、ber 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 li
4、st 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 Standa
5、rds 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
6、does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and
7、 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 Amd. No.
8、Date Comments 14729 4 November 2003 Changes to Table 6EUROPEAN STANDARD EN 50216-2 January 2002 NORME EUROPENNE + A1 December 2002 EUROPISCHE NORM CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische
9、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: Ga
10、s and oil actuated relay for liquid immersed transformers and reactors with conservator (includes amendment A1:2002) Accessoires pour transformateurs de puissance et bobines dinductance Partie 2: Relais de protection (dgagement gazeux, niveau dhuile) pour transformateurs et ractance immergs dans un
11、dilectrique liquide quips dun conservateur (inclut lamendement A1:2002) Zubehr fr Transformatoren und Drosselspulen Teil 2: Buchholzrelais fr flssigkeitsgefllte Transformatoren und Drosselspulen mit Ausdehnungsgef (enthlt nderung A1:2002) This amendment A1 modifies the European Standard EN 50216-2:2
12、002; 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 conc
13、erning 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
14、 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, Ne
15、therlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EN 50216-2:2002 2 Foreword 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
16、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
17、(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
18、 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 am
19、endment have to be withdrawn (dow) 2005-11-01 3 EN 50216-2:2002 Contents Page 1 Scope. 4 2 Normative references 4 3 Service conditions 4 3.1 Maximum inclination4 3.2 Operating pressure4 3.3 Sensitivity of the relay contacts to magnetic fields . 5 3.4 Special mechanical conditions. 5 4 Dimensions 5 5
20、 Operational performance7 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
21、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 EN 50216-2:2002 4 1 Scope EN 50216-2 covers the gas and oil actuated relay (Buchholz relay) for liqui
22、d 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
23、 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,
24、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
25、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 press
26、ure-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 p
27、osition; 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 withsta
28、nding an overpressure of 250 kPa for 2 min. 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 fault
29、s, 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 sh
30、all 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/s, with type 1 spectrum, shall apply for both classes. 4 Dimensions Tables 1 and
31、2 are to be read with Figures 1 and 2. Table 1 Preferred dimensions of relay in mm L Nominal diameter D nA max. B max. C max. D amin. Short type Long type E b25 c205 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 aMinimum clearance to remo
32、ve the mechanism from the body of the relay. bMinimum clearance for mounting and access to the relay. cFor nominal diameter 25 mm thread connections G1 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 D nd1 d2 d3 d4 S
33、hort 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 EN 50216-2:2002 6 Figure 1 D n25 to 100 with round flanges Figure 2 D n25 with threaded connections Alternative dimensions following Tables 3 and 4 may be agreed between purchas
34、er and supplier. Table 3 Other dimensions of relay in mm Nominal diameter D nA max. B max. C max. D1 amin. L E b25 180 140 320 200 127 315 50 170 150 320 200 184 315 80 170 150 320 200 184 315 aMinimum clearance for access of petcocks. bMinimum clearance for mounting and access to the relay. 7 EN 50
35、216-2:2002 Table 4 Alternative flange dimensions of the relay in mm Nominal diameter D nd1 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 wit
36、h 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 cm and 300 cm or 400 cm). Gas shall not
37、 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. EN 50216-2:
38、2002 8 Table 5 Steady oil flow for relay operation Oil pipe connection internal diameter mm Steady oil flow for relay operation m/s Tolerance % 25 1 15 50 1 15 80 1 or 1,5 or 2 15 100 1,5 or 2 15 Other values may be agreed between purchaser and supplier. The relay shall be insensitive to oil flow fr
39、om 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
40、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 r
41、eset. 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 equipme
42、nt). 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 22
43、0 V d.c. 2 A 250 W L/R 0,5 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-operati
44、on. 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 mm to 4 mm. The thread shall be minimum M5. It shall be possible to f
45、it 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
46、 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
47、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 I
48、t 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
49、conservator. 7.7 Pressure and vacuum The relay shall withstand all pressure and vacuum test stresses (see 9.1.1 and 9.2). EN 50216-2:2002 10 8 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 o
