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New line-selection method for single phase grounding fault in distribution networks with two phase’s current transformers

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4 Author(s)
Zhang Yanxia ; Key Lab. of Power Syst. Simulation & Control of Minist. of Educ., Tianjin Univ., Tianjin ; Jin Zhiqiang ; Dai Fengxian ; Fang Ting

In China, current transformers (TAs) are just installed at A-phase and C-phase in most distribution networks with neutral indirectly grounding. It is a very difficult problem to select single-phase grounding line using the currents of A phase and B phase. After analyzing the currents of A-phase and C- phase when B-phase grounding fault occurs, the fault line detection algorithm applying the transient characters of the sum of A-phase mutational current and C-phase mutational current is proposed. For A-phase to ground fault or C-phase to ground fault, the algorithm of constructing B-phase transient current and furthermore constructing the exact zero-sequence current is founded out through the analysis in frequency domain and time domain, and the fault line-detection method can be actualized according to zero-sequence current's transient characters. Based on them, a new method used to identify single phase to ground fault line using transient characteristics in two TAs distribution networks is formed. The proposed line-selection method is not affected by the mode whether the Petersen coil exists at neutral and the unbalanced current under normal operation condition.

Published in:

Electric Utility Deregulation and Restructuring and Power Technologies, 2008. DRPT 2008. Third International Conference on

Date of Conference:

6-9 April 2008