Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Rotor ground-fault diagnosis methods for synchronous condensers based on amplitude and phase-angle of voltage

  • Jiang, Mengyao (College of Energy and Electrical Engineering, Hohai University) ;
  • Ma, Hongzhong (College of Energy and Electrical Engineering, Hohai University) ;
  • Zhao, Shuai (College of Energy and Electrical Engineering, Hohai University) ;
  • Tang, Xiaozheng (Maintenance Branch Company of the State Grid Jiangsu Electric Power Co., Ltd.) ;
  • Liu, Yidan (Maintenance Branch Company of the State Grid Jiangsu Electric Power Co., Ltd.)
  • Received : 2020.02.18
  • Accepted : 2020.05.20
  • Published : 2020.09.20
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Abstract

A single ground fault of the rotor windings in a synchronous condenser can cause serious damage if the fault is not eliminated in time. This paper proposes a new rotor ground-fault diagnosis method for synchronous condensers based on the amplitude of the 150 Hz component of the voltage across a grounding resistance (GR) placed in the neutral of an excitation transformer. It can be seen that the amplitude of the 150 Hz component of the voltage across the GR increases with a decrease of the ground-fault resistance (GFR). This method is an improvement of existing algorithms for rotor ground-fault detection that requires less analyzing and can achieve online detection of the severity of a rotor ground fault at any point of the excitation winding. In addition, the influence of different excitation voltages on the algorithm based on phase-angle is analyzed considering actual working characteristics. Moreover, a model is built in the MATLAB/Simulink platform using the real parameters of a TTS-300-2 synchronous condenser to verify the effectiveness of the proposed method. Finally, a dual diagnostic criterion is given according to the results of simulations. The research conclusions can have a great significance on the healthy running of synchronous condensers and they can help to drastically reduce both cost and repair time.

Keywords

Acknowledgement

This work was funded in part by the Science and Technology Projects of Jiangsu Electric Power Corporation, grant number J2019114, in part by National Natural Science Foundation of China, grant number 51577050.

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