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1、BRITISH STANDARD BS EN 60567:1993 IEC 567:1992 Guide for the sampling of gases and of oil from oil-filled electrical equipment and for the analysis of free and dissolved gases The European Standard EN 60567:1992 has the status of a British Standard UDC 621.315.615.2:665.767:620.113:543.27 Licensed C
2、opy: sheffieldun sheffieldun, na, Thu Nov 09 14:59:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60567:1993 This British Standard, having been prepared under the direction of the Cables and Insulation Standards Policy Committee, was published under the authority of the Standards Board and come
3、s into effect on 15 February 1993 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference CIL/10 Special announcement BSI News October 1992 ISBN 0 580 21957 7 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), un
4、der whose supervision this European Standard was prepared, comprises the national committees of the following countries: AustriaItaly BelgiumLuxembourg DenmarkNetherlands FinlandNorway FrancePortugal GermanySpain GreeceSweden IcelandSwitzerland IrelandUnited Kingdom Amendments issued since publicati
5、on Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 14:59:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60567:1993 BSI 03-2000i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 605673 National annex NA (informative) C
6、ommittees responsibleInside back cover National annex NB (informative) Cross-referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 14:59:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60567:1993 ii BSI 03-2000 National foreword This British Standard has been prepare
7、d under the direction of the Cables and Insulation Standards Policy Committee and is the English language version of EN 60567:1992 Guide for the sampling of gases and of oil from oil-filled electrical equipment and for the analysis of free and dissolved gases, published by the European Committee for
8、 Electrotechnical Standardization (CENELEC). It is identical with IEC 567:1992 published by the International Electrotechnical Commission (IEC). The guide deals with the techniques for sampling free gases from gas-collecting relays and for sampling oil from oil-filled equipment such as power and ins
9、trument transformers, reactors, bushings, oil-filled cables and oil-filled tank-type capacitors. BS 5574:1978 is identical with IEC 567:1977. On publication of this standard, BS 5574 will be withdrawn. WARNING. This British Standard calls for the use of substances that may be injurious to health if
10、adequate precautions are not taken. It refers only to the technical suitability and does not absolve the user from legal obligations relating to health 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 r
11、esponsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 40, an inside back cover and a back cov
12、er. 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. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 14:59:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORM
13、E EUROPENNE EUROPISCHE NORM EN 60567 September 1992 UDC 621.315.615.2:665.767:620.113:543.27 Descriptors: Electrical equipment, gas, oil, sampling, sample, gas analysis, method by extraction, gas chromatography English version Guide for the sampling of gases and of oil from oil-filled electrical equ
14、ipment and for the analysis of free and dissolved gases (IEC 567:1992) Guide dchantillonnage de gaz et dhuile dans les matriels lectriques immergs, pour lanalyse des gaz libres et dissous (CEI 567:1992) Anleitung fr die Probenahme von Gasen und von l aus lgefllten elektrischen Betriebsmitteln und fr
15、 die Analyse freier und gelster Gase (IEC 567:1992) This European Standard was approved by CENELEC on 1992-06-16. 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 a
16、ny 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 ma
17、de 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, Denmark, Finland, France, Germany, Greece, Icel
18、and, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de
19、Stassart 35, B-1050 Brussels 1992 Copyright reserved to CENELEC members Ref. No. EN 60567:1992 E Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 14:59:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60567:1992 BSI 03-2000 2 Foreword The text of document 10(CO)260, as prepared by IEC Technica
20、l Committee N 10 “Fluids for electrotechnical applications”, was submitted to the IEC-CENELEC parallel vote in September 1991. The reference document was approved by CENELEC as EN 60567 on 16 June 1992. The following dates were fixed: Annexes designated “normative” are part of the body of the standa
21、rd. In this standard, Annex ZA is normative. Contents Page Foreword2 Introduction3 1Scope3 2Normative references4 3Sampling of gases from gas-collecting (Buchholz) relays4 4Sampling of oil from oil-filled equipment5 5Labelling of samples7 6Preparation of gas-in-oil standards7 7Extraction of gases fr
22、om oil9 8Gas analysis by gas-solid chromatography13 9Sensitivity and precision requirements15 Annex A (informative) Correction for incomplete gas extraction in partial degassing method by calculation38 Annex ZA (normative) Other international publications quoted in this standard with the references
23、of the relevant European publications39 Figure 1 Sampling of gas by syringe19 Figure 2 Sampling of free gases by oil displacement20 Figure 3 Sampling of free gases by vacuum21 Figure 4 Sampling of oil by syringe22 Figure 5 Sampling of oil by sampling tube23 Figure 6 Sampling of oil by bottle24 Figur
24、e 7 First method of preparing gas-in-oil standards25 Figure 8 Second method for preparing gas-in-oil standards27 Figure 9 Example of a Toepler pump extraction apparatus28 Figure 10 Types of glass strippers31 Figure 11 Stainless steel stripper33 Figure 12 Schematic arrangement for connecting an oil s
25、tripper to a gas chromatograph35 Figure 13 Schematic arrangement for gas chromatography37 Table 1 Examples of suitable column assembly18 latest date of publication of an identical national standard(dop) 1993-07-01 latest date of withdrawal of conflicting national standards(dow) 1993-07-01 Licensed C
26、opy: sheffieldun sheffieldun, na, Thu Nov 09 14:59:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60567:1992 BSI 03-20003 Introduction Gases may be formed in oil-filled electrical equipment due to natural ageing, but also, to a much greater extent, as a result of faults. Operation with a fault may
27、 seriously damage the equipment and it is valuable to be able to detect the fault at an early stage of development. Where a fault is not severe, the gases formed will normally dissolve in the oil, with a small proportion eventually diffusing from the liquid into any gas phase above it. Extracting di
28、ssolved gas from a sample of the oil and determining the amount and composition of this gas is a means of detecting such faults, and the type and severity of any fault may often be inferred from the composition of the gas and the rate at which it is formed. In the case of a sufficiently severe fault
29、, free gas will pass through the oil and collect in the gas-collecting (Buchholz) relay if fitted; if necessary this gas may be analysed to assist in determining the type of fault that has generated it. The composition of gases within the bubbles changes as they move through the oil towards the gas-
30、collecting relay. This can be put to good use, as information on the rate of gas production may often be inferred by comparing the composition of the free gases collected with the concentrations remaining dissolved in the liquid. The interpretation of the gas analyses is the subject of IEC 599. Thes
31、e techniques are valuable at all stages in the life of oil-filled equipment. During acceptance tests on transformers in the factory, comparison of gas-in-oil analyses before, during and after a heat run test can show if any hot-spots are present, and similarly analysis after dielectric testing can a
32、dd to information regarding the presence of partial discharges or sparking. During operation in the field, the periodic removal of an oil sample and analysis of the gas content serve to monitor the condition of transformers and other oil-filled equipment. The importance of these techniques has led t
33、o the preparation of this guide to the procedures to be used for the sampling, from oil-filled electrical equipment, of gases and oils containing gases, and for subsequent analysis. NOTEMethods described in this guide apply to mineral insulating oils, since experience to date has been almost entirel
34、y with such oils. The methods may also be applied to other insulating liquids, in some cases with modifications. 1 Scope This guide deals with the techniques for sampling free gases from gas-collecting relays and for sampling oil from oil-filled equipment such as power and instrument transformers, r
35、eactors, bushings, oil-filled cables and oil-filled tank-type capacitors. Three methods of sampling free gases and three methods of sampling oil are described; the choice between the methods often depends on the apparatus available and on the quantity of oil needed for analysis. Before analysing the
36、 gases dissolved in oil, they must first be extracted from the oil. Two basic methods are described, one using extraction by vacuum and the other by stripping (displacing) the dissolved gases by bubbling the carrier gas through the oil sample. The gases are analysed quantitatively after extraction b
37、y gas chromatography; a method of analysis is described. Free gases from gas-collecting relays are analysed without preliminary treatment. The preferred method for assuring the performance of the gas extraction and analysis equipment, considered together as a single system, is to degas samples of oi
38、l prepared in the laboratory and containing known concentrations of gases (“gas-in-oil standards”), and quantitatively analyse the gases extracted. Two methods of preparing gas-in-oil standards are described. For daily calibration checks of the chromatograph, it is convenient to use a standard gas m
39、ixture containing a suitable known amount of each of the gas component to be analysed and diluted by nitrogen or by the carrier gas. The techniques described take account, on the one hand, of the problems peculiar to analyses associated with acceptance testing in the factory, where gas contents of o
40、il are generally very low and, on the other hand, of the problems imposed by monitoring equipment in the field, where transport of samples may be by unpressurised air freight and where considerable differences in ambient temperature may exist between the plant and the examining laboratory. Licensed
41、Copy: sheffieldun sheffieldun, na, Thu Nov 09 14:59:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60567:1992 4 BSI 03-2000 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of
42、publication, the editions indicated were valid. All standards 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 standards indicated below. Members of IEC and ISO maintain r
43、egisters of currently valid International Standards. IEC 296:1982, Specification for unused mineral insulating oils for transformers and switchgear. IEC 599:1978, Interpretation of the analysis of gases in transformers and other oil-filled electrical equipment in service. ISO 5725:1986, Precision of
44、 test methods. Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests. 3 Sampling of gases from gas-collecting (Buchholz) relays 3.1 General remarks Gas samples from relays should be taken from the equipment with the minimum delay after gas accumulati
45、on has been signalled. Changes in composition caused by the selective reabsorption of components may occur if free gases are left in contact with oil. Certain precautions are necessary when taking gas samples. The connection between the sampling device and the sampling vessel must avoid the ingress
46、of air. Temporary connections should be as short as possible. Any rubber or plastic tubing used should have been proved to be impermeable to gases. Gas samples should be properly labelled (see clause 5) and analysed without undue delay to minimize hydrogen loss (e.g. within a maximum period of one w
47、eek). Oxygen, if present in the gas, may react with any oil drawn out with the sample. Reaction is delayed by excluding light from the sample, for example by wrapping the vessel in aluminium foil or suitable opaque material. Of the three methods described below, the syringe method is frequently pref
48、erred. Sampling into a sampling tube by liquid displacement, using transformer oil as a sealing liquid, is simple but the different solubilities of the gas components may need to be taken into account if the gas quantity is such that some oil remains in the tube. The vacuum method requires skill to
49、avoid contaminating the sample by leakage of air into the system. It is particularly true where the gas to be sampled may be at less than atmospheric pressure (e.g. some sealed transformers). 3.2 Sampling of free gases by syringe 3.2.1 Sampling equipment (see Figure 1) 1) Impermeable oil-resistant plastic or rubber tubing + provided with a connector to fit on to a suitable sampling connection of the gas-collecting relay. 2) Gas-tight syringes of suitable volume ) (25 ml to 250 ml). Medical or veterinary quality glass syringes with