A Combined Electro-Thermal Breakdown Model for Oil-Impregnated Paper

Meng Huang, Yuanxiang Zhou, Zhongliu Zhou and Bo Qi
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Meng Huang: School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
Yuanxiang Zhou: State Key Lab of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Zhongliu Zhou: State Key Lab of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Bo Qi: School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China

Energies, 2017, vol. 10, issue 12, 1-12

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.

Keywords: space charge; oil-impregnated paper; mobility; breakdown (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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