ABB BAILEY 1769-PA2 1769-PA4
零序电流互感器在电路中能够对电路进行保护，一旦整个电路中有些部分发生故障，比如触电或者漏电时，零序电流互感器就能够及时的切断电源，进行报警等等，下面仪器仪表世界网的***来给大家介绍一下零序电流互感器的保护原理。
零序电流保护具体应用可在三相线路上各装一个电流互感器，或让三相导线一起穿过一零序CT，也可在中性线N上安装一个零序CT，利用这些C.T来检测三相的电流矢量和，即零序电流Io，IA+IB+IC=Io，当线路上所接的三相负荷完全平衡时（无接地故障，且不考虑线路、电器设备的泄漏电流），Io=0；当线路上所接的三相负荷不平衡，则Io=IN，此时的零序电流为不平衡电流IN；当某一相发生接地故障时，必然产生一个单相接地故障电流Id，此时检测到的零序电流IO=IN+Id，是三相不平衡电流与单相接地电流的矢量和。
对IT系统，一般均是使用对供电可靠性要求较高、对单相接地不必要立即切断供电回路、但需发出绝缘***监察信号、以维持继续供电一段时间的工矿企业内的不配出中性线的三相三线配电线路。当单相接地时，该故障线路***过的零序电流是全系统非故障系统电容电流之和，因而容易检测出接地故障电流，故可用零序电流保护装置来监察相对地***次接地故障。
对于零序电流保护的零序CT安装，一定要符合有关工艺标准。对于IT接地系统，由于发生单相接地故障时，接地电流不仅可能沿着发生故障电缆的导体表面流回，而且也可能沿着非故障电缆的导体表面流回，故安装时必须将电缆头经零序CT接地，这样才能保证故障相和非故障相的电容电流通过接地点，即能防止区外故障时保护装置误动作，又能保证故障时装置可靠动作。
如零序CT安装于配电屏的N线母排上，由于配电屏金属外壳一般直接与接地极相联，当母线发生接地短路时，产生的故障电流Id将沿着配电屏金属外壳→接地线→变压器中性点流动，而不经过零序CT，达不到所要求实现的保护功能，这一点在现场施工时很容易疏忽。
以上就是零序电流互感器的保护原理的简单介绍，这是一个连续的工作过程，想要有更加深入的了解，就要在实际操作用进行及时的总结。
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