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| The Analysis on 500kV Bus-differential Protection Latch of a Substation because of TA Break |
| Feng Shun, Qu Xin, Wang Yi, Ge Linzhao, Chen Sisi |
| State Gird He’nan Electric Power Conporation Maintenance Company Operation, Zhengzhou 450000 |
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Abstract The bus-differential protection of a 500kV 3/2 connection substation reported 5053 circuit breaker branch TA break, check found to be due to 5053 circuit breaker branch three-phase current imbalance caused by the zero sequence current to meet the bus protection TA off Line logic criterion. The main circuit of the 5053 circuit breaker branch circuit A-phase main circuit isolation switch contact resistance is too large, resulting in 5053 circuit breaker three-phase main circuit resistance imbalance, resulting in the 3/2 system zero sequence circulation. The simulation of the zero sequence circulation generated by 3/2 system of 3-phase main circuit resistance imbalance of 5053 circuit breaker is simulated by Simulink model. It is also reminded to pay attention to the unbalance of the three-phase resistance in the maintenance test deviation.
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Published: 20 July 2017
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Feng Shun,Qu Xin,Wang Yi等. The Analysis on 500kV Bus-differential Protection Latch of a Substation because of TA Break[J]. Electrical Engineering, 2017, 18(7): 113-116.
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| URL: |
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http://dqjs.cesmedia.cn/EN/Y2017/V18/I7/113
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2017, Vol. 18 
