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1、BRITISH STANDARD BS EN 61181:2007 Mineral oil-filled electrical equipment Application of dissolved gas analysis (DGA) to factory tests on electrical equipment The European Standard EN 61181:2007 has the status of a British Standard ICS 29.040.10; 29.180 ? Licensed Copy: London South Bank University,
2、 London South Bank University, Wed May 16 03:55:48 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 61181:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2007 BSI 2007 ISBN 978 0 580 50652 9 National foreword This British Standard
3、 was published by BSI. It is the UK implementation of EN 61181:2007. It is identical with IEC 61181:2007. It supersedes BS EN 61181:1993 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee GEL/10, Fluids for electrotechnical applications. A list of organi
4、zations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligati
5、ons. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Wed May 16 03:55:48 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 61181 NORME EUROPENNE EUROPISCHE NORM April 2007 CENELEC European Committee fo
6、r Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr 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
7、. 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) Matriels lectriques imprgns dhuile minrale - Application de lanaly
8、se des gaz dissous (AGD) lors dessais en usine de matriels lectriques (CEI 61181:2007) Getrnkte Isolierstoffe - Verwendung der Gasanalyse fr gelste Gase (DGA) als Werksprfung fr elektrische Betriebsmittel (IEC 61181:2007) This European Standard was approved by CENELEC on 2007-03-01. CENELEC members
9、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 t
10、o 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 t
11、he 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
12、, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Wed May 16 03:55:48 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 61181:2007 2 Foreword The text of document 10/675/F
13、DIS, 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
14、 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 cont
15、ents 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 indicat
16、ed 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) 2010-0
17、3-01 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. _ Licensed Copy: London South Bank University, London South Bank University, Wed May 16 03:55:48 GMT+00:00 2007
18、, Uncontrolled Copy, (c) BSI 3 EN 61181:2007 CONTENTS INTRODUCTION.4 1 Scope 5 2 Normative references .5 3 General caution, health, safety and environmental protection 5 4 Oil sampling .6 4.1 General.6 4.2 Sample containers.6 4.3 Sampling location 6 4.4 Sampling frequency.6 4.5 Sample labelling7 4.6
19、 Sample storage .7 4.7 Disposal of waste oil8 5 Factors affecting gassing rate during thermal tests8 6 Dissolved gas extraction and analysis.8 7 Report10 Annex A (informative) Gas formation rates during thermal tests on power transformers .11 Annex B (informative) Gas formation rates during chopped-
20、lightning impulse tests on instrument transformers 6.13 Annex ZA (normative) Normative references to international publications with their corresponding European publications15 Bibliography .14 Table 1 Required detection limits for factory tests.8 Table A.1 Ranges of 90 % typical rates of gas format
21、ion in modern, mineral oil- filled power transformers during thermal tests, in l/l/h.11 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 l/l/h).12 Table B.1 90 % typic
22、al gas concentration increases observed between the beginning and the end of chopped lightning-impulse tests on instrument transformers13 Licensed Copy: London South Bank University, London South Bank University, Wed May 16 03:55:48 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 61181:2007 4 INTRODUC
23、TION 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. DG
24、A 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 f
25、actory 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 11 do not apply any more to t
26、ransformers 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. Licensed Copy: London South Bank University, London South Bank University, Wed May 16 03:55:4
27、8 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 EN 61181:2007 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 r
28、ecommends 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 appl
29、ication 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 ext
30、ended 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 insulat
31、ion and may be detected by inspection 2. 2 Normative references The following referenced document is 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 amendmen
32、ts) applies. IEC 60567: Guide for the sampling of gases and of oil from oil-filled electrical equipment and for the analysis of free and dissolved gases 3 General caution, health, safety and environmental protection This standard does not purport to address all the safety problems associated with it
33、s use. It is the responsibility of the user of the standard to establish appropriate health and safety practices and determine the applicability of regulatory limitations prior to use. The mineral insulating oils which are the subject of this standard should be handled with due regard to personal hy
34、giene. Direct contact with the eyes may cause irritation. In the case of eye contact, irrigation with copious quantities of clean running water should be carried out and medical advice sought. Some of the tests specified in this standard involve the use of processes that could lead to a hazardous si
35、tuation. Attention is drawn to the relevant standard for guidance. Licensed Copy: London South Bank University, London South Bank University, Wed May 16 03:55:48 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 61181:2007 6 This standard is applicable to mineral insulating oils and used sample containe
36、rs, the disposal or decontamination of which must be done according to local regulations. Every precaution should be taken to prevent release of mineral oil into the environment. 4 Oil sampling 4.1 General Sampling of oil shall be carried out using apparatus and methods complying with IEC 60567. It
37、is recommended that samples be taken by qualified personnel, trained to operate in accordance with IEC 60567. Samples shall be taken in duplicate (test sample and spare sample). 4.2 Sample containers The most appropriate container is a gas-tight glass syringe of suitable capacity and fitted with a t
38、hree-way sampling cock. For storage and transportation, stainless steel caps may also be used. Alternative sample containers conforming to IEC 60567 are acceptable. 4.3 Sampling location Oil samples shall be representative of the bulk of the oil in the equipment. In power transformers, oil samples s
39、hall be taken from the main oil stream (e.g. at the ground level of the pipes circulating the oil through the radiators, when the pump is in operation, or using a metal pipe to bring the oil from the top oil valve to the ground). Points outside the main oil stream (e.g. from the bottom valve of the
40、tank) shall be disregarded. For instrument transformers, follow the indications of manufacturers. When using syringes, draining of at least 2 l of oil is recommended before sampling (when using bottles, twice the volume of the bottle or 5 l). When using bottles, a piece of oil- compatible tubing sho
41、uld be used from the oil valve to the bottom of the bottle, and the bottle filled with oil from the bottom up. NOTE These provisions are not applicable to electrical equipment of small oil volume. 4.4 Sampling frequency 4.4.1 Thermal tests on power transformers Irrespective of the type and duration
42、of the test, oil samples for DGA shall be taken before the test begins and after the conclusion of the test. Intermediate samples may be taken during the test depending on its duration and nature as they may be essential to improve the precision of the data and the reliability of their evaluation. P
43、ractices to that respect vary widely, and it is left to the user to decide the number of samples to be taken. Licensed Copy: London South Bank University, London South Bank University, Wed May 16 03:55:48 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 7 EN 61181:2007 Oil sampling at the followings stage
44、s of the thermal tests has been found useful: after filling the transformer with degassed oil (for quality control of the drying and filling process); one day to one week later, depending on the transformer (when impregnation of oil in paper is completed); before start of thermal test; every 2 h dur
45、ing the tests, or at different test intervals depending on test duration and transformer design; at the end of test only; 24 h or more after the test is completed (to allow for equilibrium to be completed); some users recommend analysis of the duplicate and intermediate samples only if found necessa
46、ry later. If the cooling system of the unit under test includes oil pumps, they should be operated 2 h before the first oil sample is taken and kept running until the last oil sample is taken, except for any period the test conditions require the pumps to be turned off. NOTE In the case of dielectri
47、c tests on power transformers, oil sampling may be performed: before first HV test. after all dielectric tests. 4.4.2 Impulse tests on instrument transformers An oil sample shall be taken before the chopped lightning-impulse test. A second oil sample shall be taken 72 h after the test to assure the
48、diffusion of the small quantities of gas generated during the test. NOTE 1 During dielectric tests, the oil in an instrument transformer is virtually stationary and even convective movement is restricted. Consequently, the diffusion of small quantities of gas generated to the sampling point may take
49、 a considerable time. It is essential that the manufacturer and purchaser reach an agreement on the time the last sample should be taken. NOTE 2 Between the beginning and the end of impulse tests, instrument transformers should not be subjected to other tests. 4.5 Sample labelling Oil samples should be properly labelled before dispatch to the laboratory with the following minimum infor