1、 IEC 62770 Edition 1.0 2013-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Fluids for electrotechnical applications Unused natural esters for transformers and similar electrical equipment Fluides pour applications lectrotechniques Esters naturels neufs pour transformateurs et matriels lectriques ana
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16、NATIONAL STANDARD NORME INTERNATIONALE Fluids for electrotechnical applications Unused natural esters for transformers and similar electrical equipment Fluides pour applications lectrotechniques Esters naturels neufs pour transformateurs et matriels lectriques analogues INTERNATIONAL ELECTROTECHNICA
17、L COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE Q ICS 29.040 PRICE CODE CODE PRIX ISBN 978-2-8322-1191-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication f
18、rom an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 62770 IEC:2013 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms and definitions 9 4 Properties, their significance and test methods 9 4.1
19、 General 9 4.2 Physical properties 9 Appearance 9 4.2.1Viscosity . 10 4.2.2Pour point . 10 4.2.3Water content . 10 4.2.4Density . 10 4.2.54.3 Electrical properties . 10 Breakdown voltage . 10 4.3.1Dielectric dissipation factor (DDF) 10 4.3.2Relative permittivity (dielectric constant) . 11 4.3.34.4 C
20、hemical properties . 11 Acidity 11 4.4.1Corrosive sulfur 11 4.4.2Additive content 11 4.4.3Furfural content 11 4.4.44.5 Performance 11 Oxidation stability . 11 4.5.1Total acidity 12 4.5.2Viscosity . 12 4.5.3Dielectric dissipation factor (DDF) 12 4.5.44.6 Health, safety and environmental (HSE) propert
21、ies 12 Fire point and flash point 12 4.6.1Polychlorinated biphenyls (PCBs) . 12 4.6.2Biodegradation . 12 4.6.3Toxicity . 12 4.6.45 Classification, identification, general delivery requirements and sampling 12 5.1 Classification . 12 5.2 Identification and general delivery requirements 13 5.3 Samplin
22、g 13 Annex A (normative) Summary of the test method for evaluating oxidation stability of unused natural esters 15 A.1 Introductory remark 15 A.2 Test conditions 15 A.3 Precision 15 A.4 Relative repeatability (r) . 15 A.5 Relative reproducibility (R) . 15 Annex B (informative) Specifications of low-
23、viscosity insulating fluids derived from natural esters 16 Bibliography 17 62770 IEC:2013 3 Table 1 General specifications . 14 Table A.1 Relative repeatability and relative reproducibility obtained for different parameters during RRT . 15 Table B.1 Specifications for low-viscosity of monoesters der
24、ived from natural esters . 16 4 62770 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FLUIDS FOR ELECTROTECHNICAL APPLICATIONS UNUSED NATURAL ESTERS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for
25、standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishe
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32、rvices carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC N
33、ational Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attentio
34、n is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC s
35、hall not be held responsible for identifying any or all such patent rights. International Standard IEC 62770 has been prepared by IEC technical committee 10: Fluids for electrotechnical applications. The text of this standard is based on the following documents: FDIS Report on voting 10/909/FDIS 10/
36、933/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 62770 IEC:2013 5 The committee has decided that the contents of this public
37、ation will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 62770 IEC:2013 INTRODUCTION Bec
38、ause of their higher fire points and better environmental compatibility relative to petroleum derived insulating mineral oil, the use of vegetable oils and other natural esters is on the rise as insulating and heat transfer fluids in electrical devices such as transformers. This standard sets perfor
39、mance criteria for unused natural esters earmarked for electrical applications. However, the use of natural esters is recommended only for equipment that is not open to the atmosphere, e.g. sealed transformers and reactors because these fluids are prone to rapid oxidation. This International Standar
40、d does not purport to address all the safety problems associated with its use. It is the responsibility of the user of the standard to establish appropriate health and safety practices and determine the applicability of regulatory limitation prior to use. Unused natural esters which are the subject
41、of this standard should be handled with due regard to personal hygiene. Direct contact with eyes should be avoided. In case of eye contact, irrigation with copious amounts of clean running water should be carried out and medical advice sought. Performance of some of the tests mentioned in this stand
42、ard could lead to a hazardous situation. Attention is drawn to the relevant standard test method for guidance. The disposal of natural esters, chemicals and sample containers mentioned in this standard should be carried out in accordance with current national legislation with regard to the impact on
43、 the environment. Every precaution should be taken to prevent the release of natural esters into the environment. 62770 IEC:2013 7 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS UNUSED NATURAL ESTERS FOR TRANSFORMERS AND SIMILAR ELECTRICAL EQUIPMENT 1 Scope This International Standard describes specificat
44、ions and test methods for unused natural esters in transformers and similar oil-impregnated electrical equipment in which a liquid is required as an insulating and heat transfer medium. Use of natural esters is not recommended for electrical equipment that is open to the atmosphere. In this standard
45、 the term “natural esters” applies to insulating fluids for transformers and similar electrical equipment with suitable biodegradability and environmental compatibility. Such natural esters are vegetable oils obtained from seeds and oils obtained from other suitable biological materials and delivere
46、d to an agreed point, at a set time period. These oils are comprised of triglycerides. Natural esters with additives are within the scope of this standard. Because of their different chemical composition, natural esters differ from insulating mineral oils and other insulating fluids that have high f
47、ire points, such as synthetic esters or silicone fluids. Natural, ester-derived insulating fluids with low viscosity have been introduced but are not covered by this standard. Pertinent properties of such fluids are given in Annex B. This standard is applicable only to unused natural esters. Reclaim
48、ed natural esters and natural esters blended with non-natural esters fluids are beyond the scope of this standard. The chemical nomenclature and scientific notations used in the standard are in accordance with the IUPAC handbook (Quantities, Units and Symbols in Physical Chemistry). 2 Normative refe
49、rences The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60076-14, Power transformers - Part 14: Liquid-immersed power transformers using high-temperature insulation materials IEC 60156, Insulating
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