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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29404


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10609
Prediction of the Characteristics of Transformer Oil under Different Operation Conditions
Abstract:
Power systems and transformer are intrinsic apparatus, therefore its reliability and safe operation is important to determine their operation conditions, and the industry uses quality control tests in the insulation design of oil filled transformers. Hence the service period effect on AC dielectric strength is significant. The effect of aging on transformer oil physical, chemical and electrical properties was studied using the international testing methods for the evaluation of transformer oil quality. The study was carried out on six transformers operate in the field and for monitoring periods over twenty years. The properties which are strongly time dependent were specified and those which have a great impact on the transformer oil acidity, breakdown voltage and dissolved gas analysis were defined. Several tests on the transformers oil were studied to know the time of purifying or changing it, moreover prediction of the characteristics of it under different operation conditions.
Digital Object Identifier (DOI):

References:

[1] Muhammad Arshad and Syed M. Islam: "Power Transformer Condition Monitoring and Assessment for Strategic Benefits", Australia, 2004.
[2] R. Malewski, K. Feser, A. Claudi and E. Gulski: "Digital Techniques for Quality Control and in Service Monitoring of High Voltage Apparatus", CIGRE, International Conference on Large High Voltage Electric Systems, Paris, paper 15/21/33- 03, 1996.
[3] IEC Publication No. 156: "Method for the Determination of the Electrical Strength of Insulating Oils", International Electro technical Commission, Geneva 1963.
[4] ASTM Designation D974: "Standard Method of Test for Acidity of Petroleum Products", IP139/64, 1964.
[5] ASTM Designation D92: "Standard Test Method for Flash and Fire points by Cleveland Open Cup of Petroleum Products", IP36/84, 1965.
[6] ASTM Designation D 445-65: "Standard Method of Test for Viscosity of Transparent and Opaque Liquids "Adopted 1960.
[7] IEC Publication 60599, "Mineral Oil-impregnated Equipment in Service - Guide to the Interpretation of Dissolved and Free Gases Analysis", March 1999.
[8] IEEE Std C57.104-1991, "Guide for the Interpretation of Gases Generated in Oil- Immersed Transformers", 1991.
[9] J. Aragon-Patil and S. Tenbohlen: "Improved Monitoring of Dissolved Transformer Gases on the Basis of a Natural Internal Standard (NIS)", CIGRE-23, 2007.
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