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A Combined Electro-Thermal Breakdown Model for Oil-Impregnated Paper
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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.
Title: A Combined Electro-Thermal Breakdown Model for Oil-Impregnated Paper
Description:
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.
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