Analysis of a Maloperation Event of Non Full Phase Protection of 220 kV Circuit Breaker and the Method of Circuit Improvement

doi:10.11985/2020.01.015

Abstract

Abstract:

Aiming at the malfunction problem of non-full-phase protection of circuit breaker which is frequently happens in the power system, taking the maloperation of non-full-phase protection of a 220 kV line circuit breaker as an example, the causes of maloperation of protection are analyzed in depth. Considering the actual operation and maintenance situation, an improvement method of non-full phase protection circuit based on three pairs of normally open and normally closed auxiliary contacts is proposed. This method is based on the traditional circuit breaker non-full phase protection circuit, which can effectively avoid the misoperation of non-full-phase protection caused by external environment, switching auxiliary contacts and relay faults. Taking a 220 kV standby line A and B circuit breaker body non-full phase protection circuit as an example, the method is proved to be effective and feasible by the experiment.

Key words: Non-full-phase protection, auxiliary contact, relay, insulation, circuit improvement

CLC Number:

TM77

ZHANG Bin,LIN Jianxiong,MA Yongchun. Analysis of a Maloperation Event of Non Full Phase Protection of 220 kV Circuit Breaker and the Method of Circuit Improvement[J]. Journal of Electrical Engineering, 2020, 15(1): 103-109.

Figures/Tables 11

References 14

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继电器型号	常开接点	绝缘阻值/ MΩ	结果
C4-A40出口继电器K37	14-11	1 000	正常
	24-21	1 000	正常
	34-31	1 000	正常
	44-41	1 000	正常
C4-A40出口继电器K38	14-11	1 000	正常
	24-21	1 000	正常
	34-31	1 000	正常
	44-41	1 000	正常
C3-A30时间继电器K36	14-11	50	相对偏低
	24-21	1 000	正常
	34-31	400	正常

线路间隔	非全相继电器	额定电压/额定功率	保护验证			试验结果
线路间隔	非全相继电器	额定电压/额定功率	ABC相合位继电器励磁吸合	AB相合位 C相分位	监控是否有非全相保护动作报文	试验结果
220 kV 备用甲线	K36/K37/ K38	DC110 V/ 10 A	三相跳闸	三相跳闸	无	保护动作错误
220 kV 备用乙线	K36/K37/ K38	DC110 V/ 10 A	未跳闸	三相跳闸	有	保护动作正确

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