保定零序电流互感器电气厂

零序电流互感器与普通电流互感器一样都是应用电磁感应原理工作的，但从它们的工作状态来看则有区别。普通电流互感器的一次绕组只与被保护线路的一相连接，并且一次绕组内的电流就是该相的负载电流，二次电流则是一次电流的相应值。而零序电流互感器则不然，它的一次绕组就是被保护线路的三相，在正常工作状态时，由于三相电流的矢量和等于零，铁芯中不会产生磁通，故二次绕组内也不会有感应电流。当被保护线路发生单相接地故障时，三相电流之和不再等于零，它等于每相零序电流的3倍，此时，互感器的铁芯中便产生感应磁通，二次绕组内将有感应电流，从而带动继电器使保护装置动作。

Zero sequence current transformers, like common current transformers, operate with electromagnetic induction principle, but differ from their operating states. The primary winding of an ordinary current transformer is only connected with one of the protected lines, and the current in the primary winding is the load current of the phase, and the two current is the corresponding value of the primary current. The current transformer is not, it is a three-phase winding of the protected line, in the normal working state, the vector of the three-phase current and zero flux, does not produce the core, so the two windings will not be induced current. When the protected circuit is when the single-phase grounding fault happens, three-phase current and not equal to zero, it is equal to 3 times, each phase of the zero sequence current at the same time, flux will produce iron core transformer, two secondary windings will be induced current, so as to drive the relay protection device.

10kV零序电流互感器通常是用于使继电器动作来指示线路发生接地故障的保护装置。根据规程规定，要求在6~10kV的每路出线上都要装设零序电流互感器，以便利用发生单相接地故障时所产生的零序电流使保护装置动作，发出报警信号。

10kV zero sequence current transformer is usually used to make relay action to indicate the earth fault of the line. According to the regulations, the zero sequence current transformer shall be installed on each outlet of the 6~10kV to facilitate the zero sequence current generated by the single-phase ground fault, so that the protection device can act and send out an alarm signal.