prEN IEC 62770:2023
(Main)Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
Flüssigkeiten für elektrotechnische Anwendungen - Neue natürliche Ester für Transformatoren und ähnliche elektrische Betriebsmittel
Fluides pour applications électrotechniques - Esters naturels neufs pour transformateurs et matériels électriques analogues
Tekočine za elektrotehniko - Neuporabljene naravne estrske tekočine za transformatorje in podobno električno opremo
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 62770:2023
01-junij-2023
Tekočine za elektrotehniko - Neuporabljene naravne estrske tekočine za
transformatorje in podobno električno opremo
Fluids for electrotechnical applications - Unused natural esters for transformers and
similar electrical equipment
Flüssigkeiten für elektrotechnische Anwendungen - Neue natürliche Ester für
Transformatoren und ähnliche elektrische Betriebsmittel
Fluides pour applications électrotechniques - Esters naturels neufs pour transformateurs
et matériels électriques analogues
Ta slovenski standard je istoveten z: prEN IEC 62770:2023
ICS:
29.040.01 Izolacijski fluidi na splošno Insulating fluids in general
29.180 Transformatorji. Dušilke Transformers. Reactors
oSIST prEN IEC 62770:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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10/1195/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62770 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-04-07 2023-06-30
SUPERSEDES DOCUMENTS:
10/1178/CD, 10/1193/CC
IEC TC 10: FLUIDS FOR ELECTROTECHNICAL APPLICATIONS
SECRETARIAT: SECRETARY:
Italy Mr Massimo Pompili
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 14, SC 17A, TC 20, SC 36A, TC 38, TC 99, TC 112
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of
• any relevant patent rights of which they are aware and to provide supporting documentation,
• any relevant “in some countries” clauses to be included should this proposal proceed. Recipients are reminded that the
enquiry stage is the final stage for submitting "in some countries" clauses. See AC/22/2007.
TITLE:
Fluids for electrotechnical applications – Unused natural esters for transformers and similar electrical
equipment
PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
Copyright © 2023 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
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CONTENTS
CONTENTS . 2
FOREWORD . 3
INTRODUCTION . 5
Scope . 6
Normative references . 6
3 Terms and definitions . 8
Properties, their significance and test methods . 8
4.1 General . 8
4.2 Physical properties . 8
4.2.1 Appearance & Colour . 8
4.2.2 Viscosity . 8
4.2.3 Pour point . 8
4.2.4 Water content. 9
4.2.5 Density . 9
4.3 Electrical properties . 9
4.3.1 Breakdown voltage . 9
4.3.2 Dielectric dissipation factor (DDF) . 9
4.3.3 Relative permittivity (dielectric constant) . 9
4.4 Chemical properties . 10
4.4.1 Acidity . 10
4.4.2 Corrosive sulfur . 10
4.4.3 Additive content . 10
4.4.4 Furfural content . 10
4.5 Performance . 10
4.6.1 Fire point and flash point . 11
4.6.4 Toxicity . 11
5.0 Classification, identification, general delivery requirements and sampling . 11
5.2 Identification and general delivery requirements . 12
5.3 Sampling . 12
Annex A (normative) Summary of the test method for evaluating oxidation stability of
unused natural esters . 14
A.1 Introductory remark . 14
A.2 Test conditions . 14
A.3 Precision . 14
A.4 Relative repeatability (r) . 14
A.5 Relative reproducibility (R) . 14
Bibliography . 15
Table 1 – General specifications . 12
Table A.1 – Relative repeatability and relative reproducibility obtained for different
parameters during RRT . 14
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CDV IEC 62770 IEC 2023 – 3 –
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 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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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8) Attention 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 shall 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/XXXX/FDIS 10/XXXX/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.
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The committee has decided that the contents of this publication 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.
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CDV IEC 62770 IEC 2023 – 5 –
1 INTRODUCTION
2 Because of their higher fire points and lower environmental impact relative to hydrocarbon
3 petroleum derived insulating mineral oil, the use of vegetable oils and other natural esters is
4 on the rise as insulating and heat transfer fluids in electrical devices such as transformers.
5 This standard sets performance criteria for unused natural esters earmarked for electrical
6 applications. However, the use of natural esters is recommended only for equipment that is
7 not open to the atmosphere, e.g. sealed transformers and reactors because these liquids are
8 susceptible to rapid oxidation.
9 This International Standard does not purport to address all the safety problems associated
10 with its use. It is the responsibility of the user of the standard to establish appropriate health
11 and safety practices and determine the applicability of regulatory limitation prior to use.
12 Unused natural esters which are the subject of this standard should be handled with due
13 regard to personal hygiene. Direct contact with eyes should be avoided. In case of eye
14 contact, irrigation with copious amounts of clean running water should be carried out and
15 medical advice sought.
16 Performance of some of the tests mentioned in this standard could lead to a hazardous
17 situation. Attention is drawn to the relevant standard test method for guidance.
18 The disposal of natural esters, chemicals and sample containers mentioned in this standard
19 should be carried out in accordance with current national legislation with regard to the impact
20 on the environment. Every precaution should be taken to prevent the release of natural esters
21 into the environment.
22
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23 FLUIDS FOR ELECTROTECHNICAL APPLICATIONS –
24 UNUSED NATURAL ESTERS FOR TRANSFORMERS
25 AND SIMILAR ELECTRICAL EQUIPMENT
26
27
28 Scope
29 This International Standard describes specifications and test methods for unused natural
30 esters in transformers and similar liquid-impregnated electrical equipment in which a liquid is
31 required as an insulating and heat transfer medium.
32 Use of natural esters is not recommended for electrical equipment that is open to the
33 atmosphere. The exposure of natural ester to air leads to rapid deterioration of the insulating liquid.
34 Use of natural esters should be restricted to sealed units, or with conservator tank protected from the
35 contact with atmosphere by a membrane or other suitable system
36 In this standard the term “natural esters” applies to insulating liquids for transformers and
37 similar electrical equipment with suitable biodegradability and lower environmental impact.
38 Such natural esters are vegetable oils obtained from seeds and oils obtained from other
39 suitable biological materials and delivered to an agreed point, at a set date. These oils are
40 comprised of triglycerides.
41 Natural esters with additives are within the scope of this standard. Because of their different
42 chemical composition, natural esters differ from insulating mineral oils and other insulating
43 liquids that have high fire points, such as synthetic esters or silicone fluids.
44 Natural ester-derived insulating liquids with low viscosity have been introduced but are not
45 covered by this standard. IEC 63012 standard covers these liquids.
46 This standard is applicable only to unused natural esters. Reclaimed natural esters and
47 natural esters blended with other insulating liquids are beyond the scope of this standard.
48 The chemical nomenclature and scientific notations used in the standard are in accordance
49 with the IUPAC handbook (Quantities, Units and Symbols in Physical Chemistry).
50 Normative references
51 The following documents, in whole or in part, are normatively referenced in this document and
52 are indispensable for its application. For dated references, only the edition cited applies. For
53 undated references, the latest edition of the referenced document (including any
54 amendments) applies.
55 IEC 60076-14, Power transformers - Part 14: Liquid-immersed power transformers using high-
56 temperature insulation materials
57 IEC 60156, Insulating liquids – Determination of the breakdown voltage at power frequency –
58 Test method
59 IEC 60247, Insulating liquids – Measurement of relative permittivity, dielectric dissipation
60 factor and DC resistivity of insulating fluids
61 IEC 60475, Method of sampling liquid dielectrics
62 IEC 60666, Detection and determination of specific additives in mineral insulating oils
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CDV IEC 62770 IEC 2023 – 7 –
63 IEC 60814, Insulating liquids – Oil-impregnated paper and pressboard – Determination of
64 water by automatic coulometric Karl Fischer titration
65 IEC 61125: (Unused hydrocarbon-based insulating fluids – Test methods for evaluating the
66 oxidation stability
67 IEC 61198, Mineral insulating oils – Methods for the determination of 2-furfural and related
68 compounds
69 IEC 61619, Insulating liquids – Contamination by polychlorinated biphenyls (PCBs) – Method
70 of determination by capillary column gas chromatography
71 IEC 61620, Insulating liquids – Determination of the dielectric dissipation factor by
72 measurement of the conductance and capacitance – Test method
73 IEC 62021-3, Insulating liquids – Determination of acidity – Part 3: Test methods for non
74 mineral insulating oils
75 IEC 62535:2008, Insulating liquids – Test method for detection of potentially corrosive sulfur
76 in used and unused insulating oils
77 IEC 62697-1, Test method for quantitative determination of corrosive sulfur compounds in
78 unused and used insulating liquids – Part 1: Test method for quantitative determination of
79 dibenzyl disulfide (DBDS)
80 IEC 63012 Insulating liquids - Unused modified or blended esters for electrotechnical
81 applications
82 ISO 2049 Petroleum products — Determination of colour (ASTM scale)
83 ISO 2592, Determination of flash and fire point – Cleveland open cup method
84 ISO 3016, Petroleum products – Determination of pour point
85 ISO 3104, Petroleum products – Transparent and opaque fluids – Determination of kinematic
86 viscosity and calculation of dynamic viscosity
87 ISO 3675, Crude petroleum and liquid petroleum products – Laboratory determination of
88 density – Hydrometer method
89 ISO 12185, Crude petroleum and petroleum products – Determination
...
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