Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Electrical Breakdown Properties of Oil-paper Insulation under Pulsating Voltage Influenced by Temperature

  • Bao, Lianwei (Electric Power Research Institute, CSG) ;
  • Li, Jian (State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University) ;
  • Zhang, Jing (State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University) ;
  • Li, Xudong (Electric Power Research Institute, CSG)
  • Received : 2015.03.20
  • Accepted : 2015.12.09
  • Published : 2016.11.01
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Abstract

Insulation of valve-side windings in converter transformer withstands pulsating voltages, which will produce more serious insulation problems. In this paper, the electric breakdown experiments of oil-paper insulation specimens were executed at pulsating voltages and different temperatures. Experiment and analysis results showed that the breakdown voltage decreased with increasing temperature under pulsating voltage. The influence of temperature proves to be more significant once the temperature exceeds a limitation threshold. A fitting formula between breakdown voltage and the temperature was reported. Finally, in order to clearly understand the breakdown properties under pulsating voltage, the electric field distribution and space charge behavior under pulsating voltage at different temperature were discussed.

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References

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