BSI PD IEC/TS 62332-2:2014
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Electrical insulation systems (EIS). Thermal evaluation of combined liquid and solid components – Simplified test
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 30 |
This part of IEC 62332, which is a technical specification, is applicable to EIS containing solid and liquid components where the thermal stress is the dominant ageing factor, without restriction to voltage class.
This part specifies a sealed tube test procedure for the thermal evaluation and qualification of electrical insulation systems (EIS). One aspect of this procedure is to also provide a method to assign thermal classifications to materials used in EIS where solid and liquid components are both used. This procedure describes a comparative ageing method whereby a reference system composed of kraft paper and mineral oil is compared to a candidate system of any combination of solid and insulating liquid. The test procedures in this part are specifically applicable to liquid immersed transformer insulation systems.
Similar procedures should also work for other electrotechnical devices with a combination of liquid and solid components, such as bushings, cables or capacitors, but this will be added as additional parts once experience is gained using this technical specification.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | English CONTENTS |
| 6 | FOREWORD |
| 8 | INTRODUCTION |
| 9 | 1 Scope 2 Normative references |
| 11 | 3 Terms and definitions |
| 12 | 4 Thermal ageing test apparatus 4.1 General description 4.2 Sealed tubes |
| 13 | 4.3 Gas blanketing system 4.4 Pressure relief system 4.5 Ageing ovens Figures Figure 1 – Sealed tube example |
| 14 | 5 Construction of the test object 5.1 General 5.2 Determination of component weights 5.3 Test object 5.3.1 Conductor insulation Tables Table 1 – Reference component weight ratio calculations |
| 15 | 5.3.2 Other solid insulation components 5.3.3 Liquid component 5.3.4 Structural components 5.3.5 Other components |
| 16 | 6 Test procedures 6.1 General 6.2 Preparation of the test objects 6.2.1 General 6.2.2 Reference test object |
| 17 | 6.2.3 Candidate test object Table 2 – Reference EIS ageing conditions and candidate EIS ageing temperatures Table 3 – Recommended ageing temperatures and periods for expected thermal class |
| 18 | 6.3 Diagnostic tests 6.3.1 General 6.3.2 Solid insulation 6.3.3 Liquid insulation 6.4 End-point testing |
| 19 | 6.5 Simplified one-point test 7 Analysis of data 7.1 End-point criteria 7.1.1 General 7.1.2 End-of-life of the solid component 7.1.3 Extrapolation of data 7.2 Report |
| 21 | Annex A (informative) Consideration of weight ratios A.1 Examples of transformers leading to actual weight ratios in Table A.1 A.2 Calculation of core steel surface ratios Table A.1 – Examples obtained from industry sources Table A.2 – Examples of component volume ratio calculations |
| 22 | A.3 Calculation of copper components of test A.3.1 Wire enamel samples A.3.2 Bare copper samples |
| 23 | Annex B (informative) Consideration of ageing time and temperature Figure B.1 – Reference EIS system |
| 24 | Annex C (informative) Aging example C.1 Reference system test C.2 Candidate system test Table C.1 – Calculation of end-of-life criteria for comparative evaluation |
| 25 | Figure C.1 – Example of aging result at a temperature of 165 °C Table C.2 – Example of aging experiment |
| 26 | Figure C.2 – Aging life curve |
| 27 | Bibliography |
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BSI PD IEC/TS 62332-2:2014
Electrical insulation systems (EIS). Thermal evaluation of combined liquid and solid components – Simplified test…
