The influence of temperature characteristic of zero sequence current transformer on capability of leakage protective plugs

The sensitivity of the zero-phase current transformer (ZCT) is in contradiction with its temperature characteristics, and they restrict each other. Since the size of leakage protective plug is small, it calls for high sensitivity of ZCT. Therefore the influence of temperature characteristic of ZCT on capability of leakage protective plug stands out. It´s presented in this article that through a great number of contrastive experiments and analyses, and with the introduction of characteristics of ZCT, of resisting emergent temperature change, we can find out the effective way to reduce.