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Abstract
The breakdown property of oil-impregnated paper is a key factor for converter transformer design and operation, but it is not well understood. In this paper, breakdown voltages of oil-impregnated paper were measured at different temperatures. The results showed that with the increase of temperature, electrical, electro-thermal and thermal breakdown occurred successively. An electro-thermal breakdown model was proposed based on the heat equilibrium and space charge transport, and negative differential mobility was introduced to the model. It was shown that carrier mobility determined whether it was electrical or thermal breakdown, and the model can effectively explain the temperature-dependent breakdown.
Highlights
Whether a converter transformer performs well or not in service is determined by the insulation property of oil-impregnated paper
We aim to develop an electro-thermal breakdown model under a low electric field
He had observed breakdown was about to occur. This fits Murakami’s experimental observations. He had observed that the temperature increment before thermal breakdown is no higher than 8 °C
Summary
Whether a converter transformer performs well or not in service is determined by the insulation property of oil-impregnated paper. Once breakdown takes place within oil-impregnated paper insulation, the converter transformer cannot run any longer, which can cause huge social and economic loss. The breakdown property and mechanisms of oil-impregnated paper have been key factors that restrict the design and operation of converter transformers. According to polymer breakdown theory, breakdown is generally divided into three types: thermal breakdown, electric breakdown and long-term breakdown. Thermal breakdown results from heating of dielectrics. Heat is generated under an applied electric field, and this will lead to the temperature of the material rising.
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