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1、BRITISH STANDARD BS 7821-6:2002 HD 428-6 S1:2002 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 6: Requirements and tests concerning pressurized corrugated tanks (Implementation of HD 428-6 S1:2002) The H
2、armonization Document HD 428-6 S1:2002 has the status of a British Standard ICS 29.180 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:30:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-6:2002 This British Standard, having been prepared under the dire
3、ction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 16 October 2002 BSI 16 October 2002 The following BSI references relate to work on this British Standard: Committee reference PEL/14 Draft for comme
4、nt 01/206402 DC ISBN 0 580 40498 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PEL/14, Power transformers, upon which the following bodies were represented: Association of Consulting Engineers ASTA Certification Servi
5、ces BEAMA Ltd. British Cables Association British Pump Manufacturers Association Co opted members Electricity Association Railtrack Society of Operations Engineers Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri
6、Dec 08 12:30:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-6:2002 BSI 14 October 2002 i National foreword This British Standard is the official English language version of HD 428-6 S1:2002. The UK participation in its preparation was entrusted to Technical Committee PEL/14, Power transformer
7、s, 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 th
8、e 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 of this publication are responsible for
9、their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, 2 to 5 and a back cover. The BSI copyright date displayed in this
10、 document indicates when the document was last issued. 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 pro
11、mulgate them in the UK. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:30:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:30:04 GMT+00:00 2006, Uncontrolled Copy,
12、 (c) BSI HARMONIZATION DOCUMENTHD 428.6 S1 DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENTApril 2002 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 3
13、5, B - 1050 Brussels 2002 CENELEC -All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. HD 428.6 S1:2002 E ICS 29.180 English version Three phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipm
14、ent not exceeding 36 kV Part 6: Requirements and tests concerning pressurised corrugated tanks Transformateurs 50 Hz de distribution triphass immersion dans lhuile, de 50 kVA 2 500 kVA avec tension suprieure pour lquipement ne dpassant pas 36 kV Partie 6: Prescriptions et essais relatifs aux cuves s
15、ous pression Drehstrom-l-Verteilungstransformatoren 50 Hz, 50 kVA bis 2 500 kVA mit einer hchsten Spannung fr Betriebsmittel bis 36 kV Teil 6: Anforderungen und Prfungen fr druckbeanspruchte Wellwandkessel This Harmonization Document was approved by CENELEC on 2002-02-01. CENELEC members are bound t
16、o comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning such national implementation may be obtained on application to the Central Secretariat o
17、r to any CENELEC member. This Harmonization Document exists in three official versions (English, French, German). CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, N
18、etherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:30:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HD 428.6 S1:2002 2 Foreword This Harmonization Document was prepared by the Technical
19、 Committee CENELEC TC 14, Power transformers. The text of the draft was submitted to the formal vote and was approved by CENELEC as HD 428.6 S1 on 2002-02-01. -latest date by which the existence of the HD has to be announced at national level(doa)2002-08-01 -latest date by which the HD has to be imp
20、lemented at national level by publication of a harmonized national standard or by endorsement(dop)2003-02-01 -latest date by which the national standards conflicting with the HD have to be withdrawn(dow)2005-02-01 _ Licensed Copy: London South Bank University, London South Bank University, Fri Dec 0
21、8 12:30:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 HD 428.6 S1:2002 Content Page 1Scope.4 2Normative references.4 3General conditions.4 3.1Temperature variation.4 3.2Sealing temperature4 3.3Calculation of the volume variation .4 4Test procedure .4 4.1General4 4.2Measurement of pressure range.4
22、4.3Endurance test4 4.4Leakage test5 4.5Evaluation of the tests.5 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:30:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HD 428.6 S1:2002 4 1Scope This part 6 of HD 428 series is applicable to test procedures to verify
23、 the mechanical withstand 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. 2Normative references This standard i
24、s related to the same references as in HD 428.1. 3General conditions 3.1Temperature variation For the simulation of the seasonal and daily temperature variations, the average oil temperature is assumed to vary between - 25 C (minimum ambient temperature with disconnected transformer) and + 88 C (the
25、 sum of maximum ambient temperature + 40 C and maximum allowed average oil temperature rise: 0,8 x 60 K = 48 K). 3.2Sealing temperature When sealing the tank, the average oil temperature shall be chosen between 15 C and 35 C and recorded. A manometer connected to the tank cover shall register the va
26、lue zero. 3.3Calculation 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 (for mineral oil). 4Test procedure 4.1General These tests are consi
27、dered as special tests. These tests shall be carried out (in the sequence from 4.2 to 4.4) on a tank which is considered as representative of a range of tanks by agreement between purchaser and supplier. 4.2Measurement of pressure range The increase or decrease of the oil volume as calculated in 3.3
28、 shall be added to or extracted from the 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 for sealing ? 3 C (see 3.2). 4.3Endurance t
29、est To simulate 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 from
30、the tank in the quantity calculated in 3.3. The pressure P+ and P- shall be recorded during the test at intervals. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:30:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 HD 428.6 S1:2002 The reading of the manometer
31、 with the tank relaxed shall be 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 the test evaluation, the added volume shall be recorded. NOTE 1 To avoid mechanical impulses, the test duration should not
32、 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. 4.4Leakage test After the endurance test, the same tank shall be subjected to a 24 h static leakage test with an overpressure 1,2 times the value recorded during
33、the measurement (see 4.2). 4.5Evaluation of the tests After 4.4, the following events shall be observed: the tank shall not show leakages as observed by appropriate detecting means; no cracks shall occur in the tank; heavy and unexplained discrepancies on the pressure readings taken before, during a
34、nd 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 volume of oil to be added at the end of the test may be specified for checking the permanent deformations of the tank. Licensed Copy: L
35、ondon South Bank University, London South Bank University, Fri Dec 08 12:30:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-6:2002 HD 428-6 S1:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British
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