EN 50464-4-2007 en Three-phase oil-immersed distribution transformers 50 Hz from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV - Part 4 Requirements an.pdf

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1、BRITISH STANDARD BS EN 50464-4:2007Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV Part 4: Requirements and tests concerning pressurised corrugated tanksICS 29.180nullnull nullnullnullnullnullnullnull nullnulln

2、ullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnullnull nullnullnull+A1:2011National forewordThis British Standard is the UK implementation of EN 50464-4:2007+A1:201

3、1. It supersedes BS EN 50464-4:2007 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PEL/14, Power transformers.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to includ

4、e all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 50464-4:2007+A1:2011This British Standard waspublished under the authorityof the Standards Policy andStrategy Committ

5、eeon 31 August 2007 BSI 2011Amendments/corrigenda issued since publicationDate Comments 31 December 2011 Implementation of CENELEC amendment A1:2011: additional text in subclause 3.1ISBN 978 0 580 75264 3EUROPEAN STANDARD EN 50464-4:2007+A1NORME EUROPENNE EUROPISCHE NORMCENELEC European Committee fo

6、r Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELECAll rights of exploitation in any form and by any means reserved worldwide for CENELEC members.Re

7、f. No. EN 50464-4:2007 EEnglish version Three-phase oil-immersed distribution transformers50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV -Part 4: Requirements and tests concerning pressurised corrugated tanks Transformateurs triphass de distribution immergs da

8、ns lhuile,50 Hz, de 50 kVA 2 500 kVA,de tension la plus leve pour le matriel ne dpassant pas 36 kV - Partie 4: Prescriptions et essais relatifsaux cuves sous pression lgefllte Drehstrom-Verteilungstransformatoren 50 Hz, 50 kVA bis 2 500 kVAmit einer hchsten Spannung fr Betriebsmittel bis 36 kV - Tei

9、l 4: Anforderungen und Prfungen fr druckbeanspruchte Wellwandkessel This European Standard wasapproved by CENELEC on 2006-12-01. CENELEC members are bound tocomplywiththe CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standa

10、rd 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 inanyotherlang

11、uage made by translation under the responsibility of a CENELEC member into its own languageand notified to the Central Secretariat has the same status as the official versions.CENELECmembersare the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic,Denmark

12、, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia,Slovenia, Spain, Sweden, Switzerland and the United Kingdom.ICS 29.180 Supersedes HD 428.6 S1:2002October 2011 2 Foreword T

13、he text of the Harmonization Document HD 428.6 S1:2002, prepared by the Technical Comm ittee CENELEC TC14, Power transformers, was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN 50464-4 on 2006-12-01.The following date was fixed: latest date by

14、 which the EN has to be implemented at national level by publication of an identicalnational standard or by endorsement (dop) 2007-12-01 The EN50464 seriesconsistsofthe following parts, under the general title “Three-phase oil-immersed distribution transformers 50 Hz,from 50 kVA to 2 500 kVA with hi

15、ghest voltage for equipment notexceeding 36 kV”:Part 1 General requirementsPart2-1 Distribution transformers with cable boxes on the high-voltage and/or low-voltage side General requirementsPart2-2 Distribution transformers with cable boxes on the high-voltage and/or low-voltage side Cable boxes typ

16、e 1 for use on distribution transformers meeting the requirements of EN 50464-2-1 Part2-3 Distribution transformers with cable boxes on the high-voltage and/or low-voltage side Cable boxes type 2 for use on distribution transformers meeting the requirements of EN 50464-2-1 Part 3 Determination of th

17、e power rating of a transformer loaded with non-sinusoidalcurrents Part 4 Requirements and tests concerning pressurised corrugated tanksThis document (EN 50464-4:2007/A1:2011) has been prepared by the CLC/TC 14, “Power transformers“. The following dates are fixed: latest date by which the document h

18、as to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-10-10 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2014-10-10 Attention is drawn to the possibility that some of the elements o

19、f this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. _ Foreword to amendment A1 BS EN 50464-4:2007+A1:2011 EN 50464-4:2007+A1:2011 (E) 3 Content1Scope42Normative references43General conditions43.1Temperat

20、ure variation43.2Sealing temperature.43.3Calculation of the volume variation44Test procedure.44.1General.44.2Measurement of pressure range.44.3Endurance test54.4Leakage test.54.5Evaluation of the tests.5BS EN 50464-4:2007+A1:2011 EN 50464-4:2007+A1:2011 (E) 4 1 Scope This Part 4 of EN 50464 series i

21、s applicable to testprocedures to verify the mechanicalwithstand capability of the corrugated tanks of completely oil filled and hermetically sealed distribution transformers.NOTE Variations of oil temperature due to variations of ambient temperature and loading, result in deformation of tank walls.

22、 2 Normative references For the purposes of this document, the normative references of EN 50464-1 apply.3 Generalconditions 3.1 Temperature variation For the simulation of the seasonal and daily temperature variations, the average oil temperature isassumed to varybetween -25 C (minimum ambient tempe

23、rature with disconnected transformer) and +88 C (the sumof maximum ambient temperature +40 C and maximum allowed average oiltemperature rise: 0,8 x 60 K = 48 K).3.2 Sealing temperature When sealing the tank, the average oil temperature shall be chosen between 15 C and 35 C and recorded. A manometer

24、connected to the tank cover shall register the value zero.3.3 Calculation of the volume variation From the temperature variations above, the oil volume change from the relaxed stage at the sealing temperature shall be calculated using a volume expansion coefficient of 0,000 75 K -1 (formineral oil).

25、4 Test procedure 4.1 General These tests are considered as special tests.These testsshall be carried out (in the sequence from 4.2 to 4.4) on a tank which is considered asrepresentative of a range of tanks by agreement between purchaser and supplier.4.2 Measurement of pressure range The increase or

26、decrease of the oil volume as calculated in 3.3 shall be added toor extracted fromthe relaxed tank,and the corresponding overpressure (P+) and underpressure (P-) shall be registered by a manometer connected to the tank cover.The oil temperature during the measurement shall be the same value as used

27、for sealing 3 C(see 3.2).By agreement between manufacturer and purchaser the maximum temperature used for theendurance test shall be 40 C plus 0,8 times the oil temperature rise determined by thetemperature rise test.BS EN 50464-4:2007+A1:2011 EN 50464-4:2007+A1:2011 (E) 5 4.3 Endurance test To simu

28、late the volume expansion, the tank shall be subjected to 2 000 cycles with overpressure and underpressure. Each cycle comprises one overpressure and one underpressure. To achieve the overpressure and underpressure, the volume of oil calculated in 3.3 shall be added to and extracted fromthe tankinth

29、e quantitycalculated in3.3.The pressure P+ and P- shall be recorded during the testat intervals.The reading of the manometer with the tank relaxed s hallbe recorded before (P0) and after the test(P1) and the tank shall be topped up with oil to reach the initial relaxing pressure P0. If requested for

30、 the test evaluation, the added volume shall be recorded.NOTE1 To avoid mechanical impulses, the test duration should not be too short. A minimum cycle duration of 120 s may be sufficient.NOTE 2 A pause in the test procedure does not affect the test result. 4.4 Leakage test After the endurance test,

31、the same tank shallbe subjected to a 24 h static leakage test with an overpressure 1,2 times the value recorded during the measurement (see 4.2).4.5 Evaluation of the tests After 4.4, the following events shall be observed: the tank shall not show leakages as observed by appropriate detecting means;

32、 no cracks shall occur in the tank; heavyand unexplained discrepancieson the pressure readings taken before, during and after the tests under 4.2 and 4.3, have to be considered as possible indexes of abnormal events; by agreement between manufacturer and purchaser, a limit for the volumeofoil tobe a

33、dded atthe end of the test may be specified for checking the permanent deformations of the tank.BS EN 50464-4:2007+A1:2011 EN 50464-4:2007+A1:2011 (E)BSI GroupHeadquarters 389 Chiswick High Road, London, W4 4AL, UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 standardsBSI - British Standards Ins

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