Mineral oil-filled electrical equipment - Application of dissolved gas analysis (DGA) to factory tests on electrical equipment

Specifies oil-sampling procedures, analysis requirements and procedures, and recommends sensitivity, repeatability and accuracy criteria for the application of dissolved gas analysis (DGA) to factory testing of new power transformers, reactors and instrument transformers filled with mineral insulating oil when DGA testing has been specified. The most effective and useful application of DGA techniques to factory testing is during the performance of long-term tests, typically temperature-rise (heat run) and overloading tests on power transformers and reactors, also impulse tests on instrument transformers. DGA may also be valuable for over-excitation tests run over an extended period of time. Experience with DGA results, before and after short-time dielectric tests, indicates that DGA is normally less sensitive than electrical and acoustic methods for detecting partial discharges. However, DGA will indicate when these partial discharges become harmful to the insulation and may be detected by inspection [2]. This edition includes the following significant technical changes with respect to the previous edition: a) the specific procedures used during factory tests (sampling location, sampling frequency, gas extraction and chromatographic analysis in the laboratory) are described in more detail; b) information is provided in Annex A concerning the residual gas contents recommended before thermal tests on power transformers, typical gas values observed during the tests and cases where gas formation during the tests was followed by problems in the transformers; c) typical values observed during chopped lightning-impulse tests on instrument transformers are indicated in Annex B.

Mineralölgefüllte elektrische Betriebsmittel - Anwendung der Gasanalyse für gelöste Gase (DGA) auf Werksprüfungen von elektrischen Betriebsmitteln

Matériels électriques imprégnés d'huile minérale - Application de l'analyse des gaz dissous (AGD) lors d'essais en usine de matériels électriques

Spécifie les modes opératoires d'échantillonnage des huiles, les exigences analytiques et les procédures, et recommande les critères de sensibilité, de répétabilité et de précision pour l'application de l'analyse des gaz dissous (AGD) aux essais en usine des transformateurs de puissance neufs, des bobines d'inductance et des transformateurs de mesure, dans le cas où le cahier des charges prévoit des essais d'analyse des gaz dissous (AGD). L'application des techniques d'AGD la plus utile et la plus efficace, au cours des essais en usine, est celle pratiquée pendant les essais de fonctionnement de longue durée, particulièrement les essais de surcharge et d'échauffement des transformateurs de puissance et des bobines d'inductance, ainsi que les essais au choc de foudre sur les transformateurs de mesure. L'analyse des gaz dissous peut être aussi valable pour les essais de surexcitation effectués pendant une période de temps prolongée. L'expérience acquise avec les résultats de l'AGD, avant et après les essais diélectriques de courte durée, montre que, l'analyse des gaz dissous, est moins sensible que les méthodes électriques et acoustiques pour la détection des décharges partielles. Cependant, l'AGD indiquera quand ces décharges deviennent dangereuses pour l'isolation et peuvent être détectées par inspection [2]. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) les procédures spécifiques utilisées pendant les essais en usine (points et fréquence d'échantillonnage, extraction des gaz et analyse chromatographique en laboratoire) sont décrites avec plus de détails; b) l'Annexe A fournit des informations sur les teneurs en gaz résiduelles qui sont recommandées avant les essais thermiques sur les transformateurs de puissance, sur les valeurs typiques de gaz observées pendant les essais, et sur les cas où la formation de gaz pendant les essais a été suivie de problèmes dans les transformateurs; c) l'Annexe B indique les valeurs typiques observées pendant les essais en choc de foudre coupé sur les transformateurs de mesure.

Impregnirani izolacijski materiali - Uporaba analize raztopljenih plinov pri tovarniškem preskušanju električne opreme (IEC 61181:2007)

Ta mednarodni standard določa postopke vzorčenja olj, zahteve in postopke za analizo ter priporoča merila za občutljivost, ponovljivost in natančnost pri uporabi analize raztopljenih plinov pri tovarniškem preskušanju novih močnostnih transformatorjev, reaktorjev in merilnih transformatorjev, napolnjenih z mineralnim izolacijskim oljem, kadar je določeno preskušanje z analizo raztopljenih plinov. Najučinkovitejša in najuporabnejša uporaba tehnik analize raztopljenih plinov pri tovarniškem preskušanju je med izvajanjem dolgotrajnih preskusov praviloma med preskusi dviga temperature (toplotnimi preskusi) in preskusi s prenapetostjo na močnostnih transformatorjih in reaktorjih, pa tudi med preskusi z impulzno napetostjo na merilnih transformatorjih. Analiza raztopljenih plinov je lahko uporabna tudi pri preskusih prekomernega vzbujanja, ki potekajo v daljšem časovnem obdobju. Izkušnje z rezultati analize raztopljenih plinov pred in za kratkotrajnimi dielektričnimi preskusi kažejo, da je analiza raztopljenih plinov pri odkrivanju delnih razelektritev običajno manj občutljiva kot električne in akustične metode. Vendar pa bo analiza raztopljenih plinov pokazala, kdaj delne razelektritve postanejo škodljive za izolacijo, kar se lahko odkrije s pregledom.

General Information

Status
Published
Publication Date
04-Apr-2007
Current Stage
6060 - Document made available
Start Date
05-Apr-2007
Completion Date
05-Apr-2007

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Getränkte Isolierstoffe - Verwendung der Gasanalyse für gelöste Gase (DGA) als Werksprüfung für elektrische Betriebsmittel (IEC 61181:2007)Matériels électriques imprégnés d'huile minérale - Application de l'analyse des gaz dissous (AGD) lors d'essais en usine de matériels électriques (CEI 61181:2007)Mineral oil-filled electrical equipment - Application of dissolved gas analysis (DGA) to factory tests on electrical equipment (IEC 61181:2007)29.040.01Izolacijski fluidi na splošnoInsulating fluids in generalICS:Ta slovenski standard je istoveten z:EN 61181:2007SIST EN 61181:2010en01-september-2010SIST EN 61181:2010SLOVENSKI

STANDARDSIST EN 61181:19971DGRPHãþD
SIST EN 61181:2010
EUROPEAN STANDARD EN 61181 NORME EUROPÉENNE
EUROPÄISCHE NORM April 2007

CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2007 CENELEC -

All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61181:2007 E
ICS 29.040.10; 29.180 Supersedes EN 61181:1993
English version
Mineral oil-filled electrical equipment -
Application of dissolved gas analysis (DGA)
to factory tests on electrical equipment (IEC 61181:2007)
Matériels électriques
imprégnés d'huile minérale -
Application de l'analyse des gaz dissous (AGD) lors d'essais en usine
de matériels électriques (CEI 61181:2007)
Getränkte Isolierstoffe -
Verwendung der Gasanalyse
für gelöste Gase (DGA)
als Werksprüfung
für elektrische Betriebsmittel (IEC 61181:2007)

This European Standard was approved by CENELEC on 2007-03-01. 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 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 in any other language made by translation under the responsibility of a CENELEC member 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, Bulgaria, Cyprus, the Czech Republic, Denmark, 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.

SIST EN 61181:2010
EN 61181:2007 - 2 -

Foreword The text of document 10/675/FDIS, future edition 2 of IEC 61181, prepared by IEC TC 10, Fluids for electrotechnical applications, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61181 on 2007-03-01. This European Standard supersedes EN 61181:1993. EN 61181:2007 includes the following significant technical changes with respect to EN 61181:1993: – the specific procedures used during factory tests (sampling location, sampling frequency, gas extraction and chromatographic analysis in the laboratory) are described in more detail; – information is provided in Annex A concerning the residual gas contents recommended before thermal tests on power transformers, typical gas values observed during the tests and cases where gas formation during the tests was followed by problems in the transformers; – typical values observed during chopped lightning-impulse tests on instrument transformers are indicated in Annex B. The following dates were fixed: – latest date by which the EN has to be implemented

at national level by publication of an identical
national standard or by endorsement
(dop)
2007-12-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)

2010-03-01 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 61181:2007 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60076 NOTE

Harmonized in EN 60076 series (partially modified). IEC 60599 NOTE
Harmonized as EN 60599:1999 (not modified). IEC 60044 NOTE
Harmonized in EN 60044 series (partially modified). __________
SIST EN 61181:2010
- 3 - EN 61181:2007 Annex ZA
(normative)

Normative references to international publications with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

NOTE

When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

Publication Year Title EN/HD Year

IEC 60567 -1) Oil-filled electrical equipment - Sampling of gases and of oil for analysis of free and dissolved gases - Guidance EN 60567 20052)

1) Undated reference. 2) Valid edition at date of issue. SIST EN 61181:2010
SIST EN 61181:2010

NORME INTERNATIONALECEIIEC INTERNATIONAL STANDARD 61181Deuxième éditionSecond edition2007-02 Matériels électriques imprégnés d’huile minérale –Application de l’analyse des gaz dissous (AGD) lors d’essais en usine de matériels électriques

Mineral oil-filled electrical equipment – Application of dissolved gas analysis (DGA)

to factory tests on electrical equipment Pour prix, voir catalogue en vigueur For price, see current catalogue© IEC 2007

Droits de reproduction réservés

Copyright - all rights reserved Aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission,

3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch

Web: www.iec.ch CODE PRIX PRICE CODE N Commission Electrotechnique InternationaleInternational Electrotechnical CommissionSIST EN 61181:2010

61181 © IEC:2007 – 3 – CONTENTS FOREWORD...........................................................................................................................5 INTRODUCTION.....................................................................................................................9

1 Scope.............................................................................................................................11 2 Normative references.....................................................................................................11 3 General caution, health, safety and environmental protection.........................................11 4 Oil sampling...................................................................................................................13 4.1 General.................................................................................................................13 4.2 Sample containers.................................................................................................13 4.3 Sampling location..................................................................................................13 4.4 Sampling frequency...............................................................................................13 4.5 Sample labelling....................................................................................................15 4.6 Sample storage.....................................................................................................15 4.7 Disposal of waste oil.............................................................................................17 5 Factors affecting gassing rate during thermal tests.........................................................17 6 Dissolved gas extraction and analysis............................................................................17 7 Report............................................................................................................................21

Annex A (informative)

Gas formation rates during thermal tests on power transformers.......23 Annex B (informative)

Gas formation rates during chopped-lightning impulse tests

on instrument transformers [6]...................................................................................................27

Bibliography..........................................................................................................................29

Table 1 – Required detection limits for factory tests..............................................................17 Table A.1 – Ranges of 90 % typical rates of gas formation in modern,

mineral oil- filled

power transformers during thermal tests, in μl/l/h..................................................................23 Table A.2 – Survey of cases followed by problems in core-type, mineral oil- filled power transformers, for various rates of gas formation observed during the thermal tests, (values in μl/l/h)...........................................................................................................25 Table B.1 – 90 % typical gas concentration increases observed between the beginning and the end of chopped lightning-impulse tests on instrument transformers..........................27

SIST EN 61181:2010
61181 © IEC:2007 – 5 – INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________

MINERAL OIL-FILLED ELECTRICAL EQUIPMENT – APPLICATION OF DISSOLVED GAS ANALYSIS (DGA) TO FACTORY TESTS ON 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 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 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 National 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) 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 61181 has been prepared by IEC technical committee 10: Fluids for electrotechnical applications. This second edition cancels and replaces the first edition published in 1993 and constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous edition: a) the specific procedures used during factory tests (sampling location, sampling frequency, gas extraction and chromatographic analysis in the laboratory) are described in more detail;

b) information is provided in Annex A concerning the residual gas contents recommended before thermal tests on power transformers, typical gas values observed during the tests and cases where gas formation during the tests was followed by problems in the transformers; SIST EN 61181:2010

61181 © IEC:2007 – 7 – c) typical values observed during chopped lightning-impulse tests on instrument transformers are indicated in Annex B. The text of this standard is based on the following documents: FDIS Report on voting 10/675/FDIS 10/688/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. The committee has decided that the contents of this publication will remain unchanged until the maintenance result 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.
SIST EN 61181:2010

61181 © IEC:2007 – 9 – INTRODUCTION IEC technical committee 10, responsible for IEC 61181, has prepared guidelines for performing DGA measurements during factory testing on equipment filled with mineral insulating oil in order to ensure consistency in the industry and improve the confidence with which the results will be used. DGA is used routinely as a standard quality control procedure during and after factory tests on electrical equipment, for example during temperature-rise and chopped lightning-impulse tests, to indicate that a design meets specified requirements. Due to the small quantities of gases generated during factory tests, specific requirements are necessary for the sampling and analysis of oil samples and the interpretation of results. Acceptance criteria are beyond the scope of TC 10. Attention is drawn, however, to the fact that the guidelines issued by CIGRE in 1993-1995 [1]1 do not apply any more to transformers manufactured today, the design of which having been improved. Examples of values actually observed today are indicated in Annexes A and

B. ——————— 1 Figures in square brackets refer to the bibliography. SIST EN 61181:2010

61181 © IEC:2007 – 11 – MINERAL OIL-FILLED ELECTRICAL EQUIPMENT – APPLICATION OF DISSOLVED GAS ANALYSIS (DGA) TO FACTORY TESTS ON ELECTRICAL EQUIPMENT

1 Scope This International Standard specifies oil-sampling procedures, analysis requirements and procedures, and recommends sensitivity, repeatability and accuracy criteria for the application of dissolved gas analysis (DGA) to factory testing of new power transformers, reactors and instrument transformers filled with mineral insulating oil when DGA testing has been specified. The most effective and useful application of DGA techniques to factory testing is during the performance of long-term tests, typically temperature-rise (heat run) and overloading tests on power transformers and reactors, also impulse tests on instrument transformers. DGA may also be valuable for over-excitation tests run over an extended period of time. Experience with DGA results, before and after short-time dielectric tests, indicates that DGA is normally less sens

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