AS 1883-1992

1 - AS 1883-1992 GUIDE TO MAINTENANCE AND SUPERVISION OF INSULATING OILS IN SERVICE
4 - PREFACE
5 - CONTENTS
6 - 1. Introduction
7 - 2. Scope
7 - 3. Properties and deterioration of oil
8 - 4. Oil tests and their significance
9 - 4.1 Colour and appearance
9 - 4.2 Breakdown voltage
9 - 4.3 Water content
11 - 4.4 Neutralization value
11 - 4.5 Sediment and sludge
11 - 4.6 Dielectric Dissipation Factor (DDF) and/or resistivity
12 - 4.7 Interfacial tension
12 - 4.8 Total gas content
12 - 4.9 Flash-point
12 - 4.10 Pour-point
12 - 4.11 Density
12 - 4.12 Viscosity
13 - 4.13 Inhibitor content and oxidation stability
13 - 5. Sampling of oil from equipment
14 - 6. Categories of equipment
15 - 7. Evaluation of mineral insulating oil in new equipment
16 - 8. Evaluation of used oil
16 - 8.1 Frequency of examination of oils in service
17 - 8.2 Testing procedures
18 - 8.3 Classification of oils in service
19 - 8.4 Corrective action
19 - 9. Mutual compatibility of mineral insulating oils
20 - 10. Handling and storage
21 - 11. Treatment
21 - 11.1 General considerations
24 - 11.2 Reclaiming
24 - 11.3 Re-refining
24 - 12. Replacement of oil
24 - 12.1 Replacement of oil in transformers rated below 72,5 kV and in switchgear and associated equipment
25 - 12.2 Replacement of oil in transformers rated 72,5 kV and above
25 - 13. Hygiene and environmental precautions
31 - APPENDIX A - DETERMINATION OF SEDIMENT AND SLUDGE
31 - A1. Procedure
32 - APPENDIX B - GENERAL GUIDANCE FOR OIL RECLAIMING
32 - B1. General considerations
32 - B2. Adsorbent process
35 - B3. Other reclaiming methods

Provides guidance in monitoring, evaluating and maintaining the condition of mineral insulating oil used in electric power equipment by recommended standardized tests, procedures and treatments.

This guide applies to mineral insulating oils, originally complying with the requirements of IEC 296, in transformers, switchgear and similar electrical apparatus where oil sampling is practicable and where the normal operating conditions specified in the equipment specifications apply.The purpose of this guide is to assist the power equipmentoperator in evaluatingthe condition of oil in equipment and in his efforts to maintain oil in serviceable condition. To this end, the guide recommends standardized tests and evaluation procedures and outlines methods for reconditioning and reclaiming oil whenever necessary.Note - It is recognized that the oil in certain types of equipment may contain dissolved gases, the analysis of which may be useful in assessing the condition of the insulation system. It is not the intent of this guide to cover this subject. The interested reader is referred to IEC 567 and 599.

First published as AS CC11-1965 (being endorsement of BS CP 1009-1959 without amendment).
Revised and redesignated AS 1883-1976.
Second edition 1992.