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IEC 60567 Edition 4.0 2011-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Oil-f

IEC 60567 Edition 4.0 2011-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Oil-filled electrical equipment – Sampling of gases and analysis of free and dissolved gases – Guidance Matériels électriques immergés – Échantillonnage de gaz et analyse des gaz libres et dissous – Lignes directrices INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XA ICS 29.040 PRICE CODE CODE PRIX ISBN 978-2-88912-768-9 ® Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale ® This is a preview - click here to buy the full publication – 2 – 60567 © IEC:2011 CONTENTS FOREWORD ........................................................................................................................... 5 INTRODUCTION ..................................................................................................................... 7 1 Scope ............................................................................................................................... 9 2 Normative references ....................................................................................................... 9 3 Sampling of gases from gas-collecting (Buchholz) relays ................................................ 10 3.1 General remarks.................................................................................................... 10 3.2 Sampling of free gases by syringe ......................................................................... 10 3.2.1 Sampling equipment .................................................................................. 10 3.2.2 Sampling procedure................................................................................... 11 3.3 Sampling of free gases by displacement of oil ....................................................... 12 3.4 Sampling of free gases by vacuum ........................................................................ 13 3.5 Sampling of oil from oil filled equipment ................................................................ 14 4 Labelling of gas samples ................................................................................................ 14 5 Sampling, labelling and transferring of oil from oil-filled equipment ................................. 14 5.1 Sampling and labelling of oil .................................................................................. 14 5.2 Transfer of oil for DGA analysis ............................................................................. 14 5.2.1 Transfer from oil syringes .......................................................................... 14 5.2.2 Transfer from ampoules ............................................................................. 15 5.2.3 Transfer from flexible metal bottles ............................................................ 15 5.2.4 Transfer from glass and rigid metal bottles ................................................ 15 6 Preparation of gas-in-oil standards ................................................................................. 15 6.1 General remark ..................................................................................................... 15 6.2 First method: preparation of a large volume of gas-in-oil standard ......................... 15 6.2.1 Equipment ................................................................................................. 15 6.2.2 Procedure .................................................................................................. 16 6.2.3 Calculation ................................................................................................ 18 6.3 Second method: preparation of gas-in-oil standards in a syringe or a vial .............. 18 6.3.1 Equipment ................................................................................................. 19 6.3.2 Procedure .................................................................................................. 20 7 Extraction of gases from oil ............................................................................................ 20 7.1 General remarks.................................................................................................... 20 7.2 Multi-cycle vacuum extraction using Toepler pump apparatus ............................... 21 7.2.1 Toepler pump extraction apparatus ............................................................ 21 7.2.2 Extraction procedure ................................................................................. 24 7.3 Vacuum extraction by partial degassing method .................................................... 25 7.3.1 General remark ......................................................................................... 25 7.3.2 Partial degassing apparatus ...................................................................... 25 7.3.3 Extraction procedure ................................................................................. 26 7.4 Stripping extraction method ................................................................................... 26 7.4.1 Stripping apparatus ................................................................................... 26 7.4.2 Outline of procedure .................................................................................. 29 7.5 Headspace method ............................................................................................... 30 7.5.1 Principle of the method .............................................................................. 30 7.5.2 Symbols and abbreviations ........................................................................ 30 7.5.3 Headspace extraction apparatus................................................................ 31 7.5.4 Headspace extraction procedure ............................................................... 35 This is a preview - click here to buy the full publication 60567 © IEC:2011 – 3 – 7.5.5 Calibration of the headspace extractor ...................................................... 39 8 Gas analysis by gas-solid chromatography ..................................................................... 41 8.1 General remarks.................................................................................................... 41 8.2 Outline of suitable methods using Table 4 ............................................................. 42 8.3 Apparatus .............................................................................................................. 42 8.3.1 Gas chromatograph ................................................................................... 42 8.3.2 Columns .................................................................................................... 44 8.3.3 Carrier gas ................................................................................................ 44 8.3.4 Detectors ................................................................................................... 44 8.3.5 Methanator ................................................................................................ 44 8.3.6 Cold trap ................................................................................................... 44 8.3.7 Integrator and recorder .............................................................................. 44 8.4 Preparation of apparatus ....................................................................................... 45 8.5 Analysis ................................................................................................................ 45 8.6 Calibration of the chromatograph ........................................................................... 45 8.7 Calculations .......................................................................................................... 46 9 Quality control ................................................................................................................ 46 9.1 Verification of the entire analytical system ............................................................. 46 9.2 Limits of detection and quantification ..................................................................... 47 9.3 Repeatability, reproducibility and accuracy ............................................................ 47 9.3.1 General remark ......................................................................................... 47 9.3.2 Repeatability ............................................................................................. 48 9.3.3 Reproducibility ........................................................................................... 48 9.3.4 Accuracy ................................................................................................... 48 10 Report of results ............................................................................................................. 49 Annex A (informative) Correction for incomplete gas extraction in partial degassing method by calculation ........................................................................................................... 51 Annex B (informative) Mercury-free and shake test versions of the standard extraction methods ................................................................................................................................ 53 Annex C (informative) Preparation of air-saturated standards .............................................. 55 Annex D (informative) Correction for gas bubbles in syringes and air gap in rigid bottles .................................................................................................................................. 56 Annex E (informative) Procedure for comparing gas monitor readings to laboratory results .................................................................................................................................. 57 Bibliography .......................................................................................................................... 58 Figure 1 – Sampling of gas by syringe .................................................................................. 11 Figure 2 – Sampling of free gases by oil displacement .......................................................... 12 Figure 3 – Sampling of free gases by vacuum ....................................................................... 13 Figure 4 – First method of preparing gas-in-oil standards ..................................................... 17 Figure 5 – Second method for preparing gas-in-oil standards ................................................ 19 Figure 6 – Example of a Toepler pump extraction apparatus ................................................. 23 Figure 7 – Types of glass strippers ....................................................................................... 27 Figure 8 – Stainless steel stripper ......................................................................................... 28 Figure 9 – Schematic arrangement for connecting an oil stripper to a gas chromatograph ...................................................................................................................... 29 Figure 10 – Schematic representation of headspace sampler ................................................ 30 This is a preview - click here to buy the full publication – 4 – 60567 © IEC:2011 Figure 11 – Vial filled with water ........................................................................................... 32 Figure 12 – Revolving table .................................................................................................. 34 Figure 13 – Schematic arrangement for gas chromatography ................................................ 43 Figure B.1 – Schematic representation of methods in Annex B ............................................. 54 Table 1 – Information required for gas samples .................................................................... 14 Table 2 – Examples of headspace operating conditions ........................................................ 35 Table 3 – Headspace partition coefficients at 70 °C in mineral insulating oil ......................... 40 Table 4 – Examples of gas chromatographic operating conditions ......................................... 41 Table 5 – Required limits of detection in oil ........................................................................... 47 Table 6 – Examples of accuracy of extraction methods ......................................................... 49 Table A.1 – Examples of solubility coefficients ai (at 25 ºC) reported by CIGRE TF D1.01.15 ............................................................................................................................... 51 Table C.1 – Examples of solubility values of air for different oil types ................................... 55 Table C.2 – Examples of temperature variations for oxygen and nitrogen solubility in mineral oil ............................................................................................................................. 55 This is a preview - click here to buy the full publication 60567 © IEC:2011 – 5 – INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________ OIL-FILLED ELECTRICAL EQUIPMENT – SAMPLING OF GASES AND ANALYSIS OF FREE AND DISSOLVED GASES – GUIDANCE 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services 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 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 60567 has been prepared by IEC technical committee 10: Fluids for electrotechnical applications. This fourth edition cancels and replaces the third edition, published in 2005, and constitutes a technical revision. The main changes with respect to the previous edition are listed below: Since the publication of the third edition, CIGRE TF.D1.01.15 has made progress in several areas of dissolved gas analysis (DGA), notably a) oil sampling, b) laboratory analysis and solubility coefficients of gases in non-mineral oils, c) calibration of the headspace gas uploads/Finance/info-iec60567-ed4-0-b.pdf