从理论上分析配电线路出口故障时，电流速断和定时过电流保护拒动的原因，从而阐明电流互感器的响应特性对电流保护有很大的影响，最后提出相应的对策。
The causes of refusing action of over current protection when the short circuit arises at the beginning of distribution line have been theoretically analysed in this paper.
针对单纯采用相电流判据的不足之处，本文提出增加零序电流、负序电流及电流变化量判据，以有效地避免保护误动或者拒动。
Zero-sequence current criterion, negative sequence current criterion and phase current variation can be used to improve the performance of breaker failure protection for ACF sub-bank.
如果仅采用相电流判据，将无法避免失灵保护误动或者拒动。
If only phase current is used in breaker failure protection, miss trip may occur no matter the threshold of current is higher or lower than load current.
针对拒动原因，采用增加电流增量保护等措施，取得良好效果。
For miss operation, the adoption of protection measures for increasing the current gain obtains very good result.
电磁式电流互感器在电力系统故障情况下可能发生饱和，常导致继电保护装置误动或拒动。
The saturation of magnetic current transformers, occurred during a fault on the power system, will lead to mal-operation or refused operation of protection relay.
首先通过测量阻抗轨迹法对异相短路故障的测量阻抗的进行分析，得出牵引网发生异相高阻电弧短路故障时，常规原理的阻抗保护将拒动的结论。
Conventional impedance relay will refuse to trip according to an analysis of measuring impedance by means of impedance locus method when wrong-phase-coupling of traction power supply system occurs.
这将有效地避免信息缺失测量点相关的主保护区拒动，从而后备保护区动作使其所包含的多个主保护区全部停电的情况。
It effectively avoids the action failure of the primary protection zones related to the measuring point which loses information, as well as the improper action of the backup protection zone.
这将有效地避免信息缺失测量点相关的主保护区拒动，从而后备保护区动作使其所包含的多个主保护区全部停电的情况。
It effectively avoids the action failure of the primary protection zones related to the measuring point which loses information, as well as the improper action of the backup protection zone.
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