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零序电流互感器为一种线路故障电流监测器。一般只有一个铁芯与二次绕组,使用时，将一次三芯电缆穿过互感器的铁芯窗孔，二次通过引线接至专用的继电器，再由继电器的输出端接到信号装置或报警系统。在正常情况下，一次回路中三相电流基本平衡，其所产生合成磁通也近于零。在互感器的二次绕组中不感生电流，当一次线路中发生单相接地等故障时，一次回路中产生不平衡电流(意即零序电流)，在二次绕组中感生微小的电流使继电器动作，发生信号。也就是说，在电力系统产生零序电流时，通过零序电流互感器与继电保护装置或信号装置配合实现对电力系统的保护或监控。 Zero sequence current transformer is a circuit fault current monitor. Generally only one core and secondary windings, when used, will be a three core cable through the transformer core hole, the second by wire connected to a dedicated relay, again by relay outputs of receiving signal device or alarm system. Under normal conditions, a three-phase current in a circuit is essentially balanced, and the resulting synthetic flux is close to zero. In the secondary winding of transformer is not induced current, when the first line of the single-phase grounded fault occurs, a loop of unbalance current) (ie, zero sequence current, tiny electric current induced in the secondary winding relay action, signal. That is to say, the zero sequence current in power system, through the zero sequence current transformer and the relay protection device or signal device with the protection of power system and monitoring.