BS EN 61203-1995 Synthetic organic esters for electrical purposes - Guide for maintenance of transformer esters in equipment《电工用合成有机酯 设备中变压器酯的维护指南》.pdf

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1、BRITISH STANDARD BS EN 61203:1995 IEC1203:1992 Synthetic organic esters for electrical purposes Guideformaintenance of transformer esters in equipment The European Standard EN61203:1994 has the status of a BritishStandardBSEN61203:1995 This BritishStandard, having been prepared under the directionof

2、 the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comesintoeffect on 15June1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference GEL/10 Draft for comment 86/20278 DC ISBN 0 580 24173 4 Committees responsib

3、le for this BritishStandard The preparation of this BritishStandard was entrusted to Technical Committee GEL/10, Fluids for electrotechnical applications, upon which the following bodies were represented: British Cable Makers Confederation British Lubricants Federation Limited Chemical Industries As

4、sociation Electricity Association Health and Safety Executive Institute of Petroleum Institution of Electrical Engineers London Regional Transport National Association of Waste Disposal Contractors Transmission and Distribution Association (BEAMA Ltd.) Amendments issued since publication Amd. No. Da

5、te CommentsBSEN61203:1995 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 61203 3 List of references Inside back coverBSEN61203:1995 ii BSI 01-2000 National foreword This BritishStandard has been prepared by Technical Committee GEL/10

6、and is the English language version of EN61203:1994 Synthetic organic esters for electrical purposes Guide for maintenance of transformer esters in equipment, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC1203:1992, published by the Inter

7、national Electrotechnical Commission (IEC). WARNING. This BritishStandard calls for the use of substances and procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to hea

8、lth and safety at any stage. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-refere

9、nces Publication referred to Corresponding BritishStandard HD397 S1:1979 (IEC599:1978) BS5800:1979 Guide for the interpretation of the analysis of gases in transformers and other oil-filled electrical equipment in service EN60567:1992 (IEC567:1992) BS EN60567:1993 Guide for the sampling of gases and

10、 of oil from oil-filled electrical equipment and for the analysis of free and dissolved gases EN61099:1992 (IEC1099:1992) BS EN61099:1992 Specification for unused synthetic organic esters for electrical purposes Summary of pages This document comprises a front cover, an inside front cover, pagesi an

11、dii, theEN title page, pages2 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61203 S

12、eptember 1994 ICS 29.180:29.040.20 Descriptors: Electrical equipment, transformers, electrical insulating liquid, esters, organic matter, characteristics, tests, classification, maintenance English version Synthetic organic esters for electrical purposes Guideformaintenance of transformer esters in

13、equipment (IEC1203:1992) Esters organiques de synthse usages lectriques Guide de maintenance des esterspour transformateurs dans les matriels (CEI1203:1992) Synthetische organische Ester fr elektrotechnische Zwecke Leitlinie zur Wartung von Transformator-Estern in Betriebsmitteln (IEC1203:1992) This

14、 European Standard was approved by CENELEC on1994-03-08. 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 refer

15、ences 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 m

16、ember 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Por

17、tugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to al

18、l CENELEC members Ref. No. EN61203:1994 EEN61203:1994 BSI 01-2000 2 Foreword The CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC1203:1992 could be accepted without textual changes, has shown that no common modifications were necessary for the

19、acceptance as European Standard. The reference document was submitted to the CENELEC members for formal vote and was approved by CENELEC as EN61203 on8March1994. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normati

20、ve. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Tests and their significance 3 3.1 Colour and appearance 3 3.2 Density 3 3.3 Kinematic viscosity 3 3.4 Flash point Fire point 3 3.5 Water content 3 3.6 Neutralization value 3 3.7 Breakdown voltage 3 3.8 D.C. resistivity 3 3.9 Dielectr

21、ic dissipation factor 3 3.10 Diagnosis by gas analysis (IEC567 and IEC599) 3 4 Frequency of examination of liquids in service 4 5 Sampling 4 6 Testing procedures 4 6.1 Field screening tests 4 6.2 Laboratory tests 4 7 Classification of esters in service 4 8 Treatment of ester liquids in group2 4 8.1

22、Vacuum treatment and filtration 4 8.2 Molecular sieve and filtration 5 9 Materials used for maintenance equipment 5 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 6 latest date of publication ofan identical nati

23、onal standard (dop)1995-03-15 latest date of withdrawal ofconflicting national standards (dow)1995-03-15EN61203:1994 BSI 01-2000 3 1 Scope This International Standard is a guide to the maintenance of synthetic organic esters, originally complying with the requirements of IEC1099, in transformers wit

24、h rated voltages up to35kV. It is intended to assist the equipment operator in assessing the quality of the liquid during use in the equipment and maintaining it in a serviceable condition. Methods for reconditioning ester transformer liquid are outlined. This standard deals only with ester liquid u

25、sed in equipment where liquid sampling is practicable and which has not previously been filled with any other liquid. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time o

26、f publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of

27、IEC and ISO maintain registers of currently valid International Standards. IEC567:1992, Guide for the sampling of gases and of oil from oil-filled electrical equipment and for the analysis of free and dissolved gases. IEC599:1978, Interpretation of the analysis of gases in transformers and other oil

28、-filled electrical equipment in service. IEC1099:1992, Specifications for unused synthetic organic esters for electrical purposes. 3 Tests and their significance There are several tests which can be applied to transformer synthetic organic esters to determine their suitability for further use or whe

29、ther corrective action is necessary. The appropriate method of test is indicated by cross reference to clause9, “Test methods”, of IEC1099. 3.1 Colour and appearance The liquid shall be clear without visible contamination. It shall not be excessively dark in colour and shall not have an acrid odour.

30、 3.2 Density Changes in density may suggest contamination with other liquids or materials. 3.3 Kinematic viscosity Changes in viscosity suggest contamination with other liquids, or possibly serious degradation due to severe and prolonged overheating. 3.4 Flash point Fire point Diminution of the flas

31、h point or fire point indicates contamination with other liquids and/or liquid degradation. A significant reduction of the fire point and flash point could indicate a fault in the transformer. Other properties may also have changed. 3.5 Water content A value above that specified in clause7 indicates

32、 undesirable operating conditions which need corrective action, as outlined in clause8. 3.6 Neutralization value An increase in the neutralization value of an ester indicates deterioration by oxidation and/or hydrolysis. A value above that specified in clause7 indicates an undesirable liquid conditi

33、on which may accelerate solid insulation deterioration. 3.7 Breakdown voltage An unsatisfactory value may be due to the presence of water or particulate contamination, or degradation of the liquid. Remedial treatment of the liquid as described in clause8 should be considered. 3.8 D.C. resistivity A

34、reduced value suggests contamination with water or with other soluble impurities. Treatment of the liquid as described in clause8 should be considered. 3.9 Dielectric dissipation factor An increased value may well indicate degradation of the ester liquid or contamination with water or other impuriti

35、es. Remedial treatment of the liquid should be considered. 3.10 Diagnosis by gas analysis (IEC567 and IEC599) Ester liquids will produce a mixture of gases on thermal decomposition due to high temperature hot spots, arcing and breakdown under electrical stress conditions. These will be similar to th

36、ose produced from mineral oil (see IEC567 and IEC599) but no information is as yet available to allow interpretation of gas analysis data. Property Subclause of IEC1099 Colour and appearance 9.1/9.2 Density 9.3 Kinematic viscosity 9.4 Flash point 9.5 Fire point 9.6 Water content 9.10 Neutralization

37、value 9.11 Breakdown voltage 9.13 D.C. resistivity 9.14 Dielectric dissipation factor 9.14EN61203:1994 4 BSI 01-2000 4 Frequency of examination of liquids in service It is not possible to specify a frequency of examination which will meet all equipment designs and operating conditions. Where practic

38、able, samples of ester should be taken and analyzed before energizing, after twelve months, and thereafter at five year intervals. Heavily loaded and higher voltage units, with rated voltage greater than35kV, may require more frequent testing. Increased frequency is also advisable where any of the s

39、ignificant properties approaches the limit recommended for continued service or shows an increased rate of change. 5 Sampling Sampling should be carried out during or as soon as possible after normal operation by the procedures described in clause8 of IEC1099. It is imperative that all precautions d

40、escribed in the method are adhered to, in order to avoid erroneous test results and retesting. 6 Testing procedures In general, no one test can be used as the sole criterion of the condition of an ester in service. Evaluation of the condition of a liquid should preferably be based upon the value of

41、significant characteristics as determined in adequately equipped laboratories. However, field screening tests are widely used. 6.1 Field screening tests Field screening tests are usually made to determine which samples require laboratory investigation. Field tests are usually limited to visual inspe

42、ction and breakdown voltage. However, portable instruments are available that can be used for field measurements of d.c. resistivity, dielectric dissipation factor, neutralization value and water content. 6.2 Laboratory tests These include most or all of the tests listed in clause3 as these often en

43、able the cause of degradation or source of contamination to be recognized. 7 Classification of esters in service Based on current industrial experience, esters in service can be classified as follows: GROUP1 This group includes liquids that are in satisfactory condition for continued use. The values

44、 of the following properties are considered to be satisfactory for35kV or lower voltage equipment. GROUP2 This group includes liquids which require only minor reconditioning for further service. This will be indicated by a cloudy or dirty appearance, higher moisture content and lower breakdown volta

45、ge. Theappropriate treatment is outlined in clause8. Treatment should result in a significant improvement of the condition of the ester with values for breakdown voltage and water content tending to approach those indicated by the manufacturer at commissioning. GROUP3 This group includes liquids whi

46、ch cannot be restored to a satisfactory condition by the methods outlined in clause8. Such esters should be returned to the supplier or disposed of in accordance with local regulations. 8 Treatment of ester liquids in group2 Reconditioning may be carried out by one of the following two methods using

47、 equipment commensurate with the quantity of liquid to be processed. 8.1 Vacuum treatment and filtration The ester liquid, preferably heated at60 C to80 C, shall be passed into a vacuum chamber by spraying or by flow over baffle plates to give a large surface area of liquid. The pressure shall be as

48、 low as possible,0,1kPa or less as attainable in practice. Afilter of54m to104m pore size shall be placed on the exit side of the unit. Appearance clear Water content k 400mg/kg Neutralization value k 2,0mgKOH/g Breakdown voltage 30kV Dielectric dissipation factor, at ambient temperature k 0,01 D.C.

49、 resistivity at ambienttemperature U6G7.m Fire point 300 CEN61203:1994 BSI 01-2000 5 8.2 Molecular sieve and filtration The ester liquid shall be passed through a bed of dried molecular sieve beads at ambient temperature, and then, filtered at54m to104m nominal pore size. NOTEIf the material cannot be rendered usable after reconditioning it should be disposed of as described in clause6 of IEC1099. 9 Materials used for maintenance equipment Precautions normally taken with dielectric liquids to prevent contamination from water, high humidity