Effect of Copper on Ageing Behavior and Breakdown Voltage Properties of Transformer Oil
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Transactions on Electrical and Electronic Materials https://doi.org/10.1007/s42341-020-00249-1
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Effect of Copper on Ageing Behavior and Breakdown Voltage Properties of Transformer Oil Ajumon Somasekharan Pillai1 · J. Arul Linsely2 Received: 3 June 2020 / Revised: 22 September 2020 / Accepted: 5 October 2020 © The Korean Institute of Electrical and Electronic Material Engineers 2020
Abstract In this paper, the “Breakdown Strength” of ester base liquid MIDEL 7131(MIDEL Ltd), Mineral Transformer oil (Grosvenor Oil Service), Diala D (Shell Ltd) and THESO insulating oil (Tetra Corp) that are subjected to three different ageing conditions is examined. The breakdown strength of thermally aged insulating oils with copper and without copper has also been tested. Therefore the effect of copper as a catalyst in ageing of insulating liquids was also examined. After analyzing the effect of copper on ageing indicated that, copper had a huge influence on darkening all the insulating oils except MIDEL 7131 and thereby accelerating the ageing process. The breakdown mechanism of oils has changed due to ageing with copper. In this paper, breakdown comparison of transformer oils are analyzed with different insulating oils like un-aged and aged. Transformer oils breakdown voltage test under 0.9 mm gap spacing and the average breakdown voltage behaviour, field behaviour, maximum field at the needle tip transformer oils are also investigated. Keywords Breakdown strength · Ageing process · Copper · Insulating oils
1 Introduction In the field of High Voltage Engineering, insulation plays a vital part because its failure has got a major economic impact on consumers, suppliers and distributors of electrical energy. Implementation of new application in the existing power system leads to additional stress in the insulating system. Because of these reasons it is very important to gather a deep knowledge about the residual life time of the insulation system used in the high voltage engineering [1, 2]. Condition Monitoring and life time predictions are gaining more importance in high voltage engineering especially in high voltage plants including cables. Therefore the better way to identify the plant health is to determine the characteristics of insulating oil used in power system. Many studies on the ageing behavior of various insulating oils have been done. Data regarding the indicators of oil ageing can * Ajumon Somasekharan Pillai [email protected] 1
Department of Electrical Engineering, Noorul Islam University, Thuckalay, Tamilnadu, India
Department of Electrical and Electronics Engineering, Noorul Islam Centre for Higher Education, Kanyakumari, Tamilnadu, India
2
be reliable to identify the plant health especially applications in high voltage transformers. According to IEEE standard 57.1000, the expected minimum service lifetime of a liquid immersed distribution transformers and power transformers operating at an average ambient of 30 °C is about 20.55 years. Ageing deterioration of an insulating system infl
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