1、 IEC 62021-3 Edition 1.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Insulating liquids Determination of acidity Part 3: Test methods for non-mineral insulating oils Liquides isolants Dtermination de lacidit Partie 3: Mthodes dessai pour les huiles non minrales isolantes IEC 62021-3:2014-03(
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19、webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 62021-3 Edition 1.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Insulating liquids Determination of acidity Part 3: Test methods for non-mineral
20、insulating oils Liquides isolants Dtermination de lacidit Partie 3: Mthodes dessai pour les huiles non minrales isolantes INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE T ICS 29.040.10 PRICE CODE CODE PRIX ISBN 978-2-8322-1404-6 Registered trademark of the Inter
21、national Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IE
22、C 62021-3:2014 IEC 2014 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms and definitions 7 4 Method A: Automatic potentiometric titration 8 4.1 Principle 8 4.2 Reagents and auxiliary products 8 Reagents 8 4.2.1Titration reagent . 8 4.2.2Titration solvent 8 4.2.3Potas
23、sium hydrogen phthalate, primary standard 9 4.2.4Reference electrode electrolyte 9 4.2.5Aqueous buffer solutions 9 4.2.6Glass electrode cleaning solution . 9 4.2.7 4.3 Apparatus 9 Potentiometric titration apparatus . 9 4.3.1Glass indicator electrode 9 4.3.2Reference electrode . 10 4.3.3Stirrer . 10
24、4.3.4Titration vessel . 10 4.3.5Titration stand 10 4.3.6 4.4 Sampling 10 4.5 Preparation and maintenance of electrode system . 10 Preparation . 10 4.5.1Maintenance . 10 4.5.2 4.6 Calibration . 11 Calibration of pH titrimeter 11 4.6.1Settings for the potentiometric instrument . 11 4.6.2 4.7 Procedure
25、 12 General 12 4.7.1Standardization of alcoholic potassium hydroxide solution 12 4.7.2Blank titration . 13 4.7.3Sample titration 13 4.7.4 4.8 Calculation of result . 14 4.9 Precision 14 Repeatability 14 4.9.1Reproducibility 14 4.9.2 4.10 Report 15 5 Method B: Colourimetric titration 15 5.1 Principle
26、 15 5.2 Reagents . 15 General 15 5.2.1Titration reagent . 15 5.2.2Titration solvent 16 5.2.3Potassium hydrogen phthalate, primary standard 16 5.2.4IEC 62021-3:2014 IEC 2014 3 Standard hydrochloric acid solution 16 5.2.5Alkali blue 6B indicator solution 16 5.2.6Cobalt nitrate solution . 16 5.2.7 5.3
27、Apparatus 16 Titration vessel . 16 5.3.1Stirrer . 16 5.3.2Burette . 16 5.3.3 5.4 Sampling 16 5.5 Procedure 17 General 17 5.5.1Standardization of alcoholic potassium hydroxide solution 17 5.5.2Blank titration . 17 5.5.3Sample titration 18 5.5.4 5.6 Calculation of result . 18 5.7 Precision 18 Repeatab
28、ility 18 5.7.1Reproducibility 19 5.7.2 5.8 Report 19 (informative) Determination of acidity in non-mineral electrical insulating oils Annex A by photometric titration . 20 A.1 Principle 20 A.2 Reagents and solvents . 20 A.3 Preparation of titration solutions and solvents 20 A.3.1 Potassium hydroxide
29、 alcoholic solution (0,01 mol/l) 20 A.3.2 Potassium hydrogen phthalate solution (0,01 mol/l) 20 A.3.3 Titration solvent 21 A.4 Apparatus 21 A.4.1 Volumetric titrator . 21 A.4.2 Titration vessel . 21 A.4.3 Titration stand 21 A.4.4 Stirrer . 21 A.4.5 Recorder/printer . 21 A.4.6 Photometric sensor . 21
30、 A.5 Sampling 22 A.6 Procedure 22 A.6.1 Preparation and maintenance of the titration system . 22 A.6.2 Determination of acidity of the titration solvent (blank titration) . 22 A.6.3 Determination of molarity of the potassium hydroxide alcoholic solution (0,01 mol/l) 22 A.6.4 Titration of soluble aci
31、dity in the oil sample. 23 A.7 Calculation of result . 23 A.8 Report 23 Figure 1 Potentiometric titration curve 12 Figure A.1 Molecular structure of para-naphtholbenzein indicator in a) acidic media and b) basic media . 24 Figure A.2 UV spectra of para-naphtholbenzein indicator in toluene/2-propanol
32、/water solution in acidic media (curve a) and basic media (curve b) . 24 4 IEC 62021-3:2014 IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ INSULATING LIQUIDS DETERMINATION OF ACIDITY Part 3: Test methods for non-mineral insulating oils FOREWORD 1) The International Electrotechnical Commission
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43、 be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62021-3 has been prepared by IEC technical committee 10: Fluids for electrotechnical applications. The text of this standard is based on the following documen
44、ts: FDIS Report on voting 10/936/FDIS 10/942/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. A list of all parts in the IEC 620
45、21 series, published under the general title Insulating liquids Determination of acidity, can be found on the IEC website. IEC 62021-3:2014 IEC 2014 5 The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “h
46、ttp:/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. IMPORTANT The “colour inside” logo on the cover page of this publication indicates that it contains colours which are consid
47、ered to be useful for the correct understanding of its contents. Users should therefore print this publication using a colour printer. 6 IEC 62021-3:2014 IEC 2014 INTRODUCTION Health and safety This International Standard does not purport to address all the safety problems associated with its use. I
48、t 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 insulating liquids which are the subject of this standard should be handled with due regard to personal hygiene. Direct
49、 contact with the eyes may cause slight 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 procedures referenced in this standard involve the use of processes that could lead to a hazardous situation. Attention is drawn to the relevant standard for guidance. Environment This standard involves non-mineral
