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这种零序电流互感器主要用在中性点不接地或经消弧线圈接地的系统。

The zero sequence current transformer is mainly used in neutral point grounding or via arc suppression coil grounding system. 

1、小电流选线装置用零序电流互感器

1, small current line selection device with zero sequence current transformer 

小电流选线装置本身没有整定值，零序电流只是装置的判据之一，要求零序电流互感器在一次接地电流较小时，和非金属性接地时，零序电流互感器也要有一定的输出，来满足装置启动的门坎值。装置本身的负载阻抗并不大，但需要通过电缆将各个零序电流互感器与装置连接起来，所以电缆的阻抗就是零序电流互感器的主要负载阻抗，这种零序电流互感器的负载阻抗一般为2.5Ω左右，经过多年实践和试验得知与小电流选线装置配套的零序电流互感器选用：

Small current line selection device itself without setting value, zero sequence current is one of the criterion of device, for zero sequence current transformer in a grounding current is small, and non-metal earthing, zero sequence current transformer is output to a certain extent, to satisfy the operation of threshold value. The load impedance of the device itself is not big, but need through the cable connects the zero sequence current transformer and the device, so the impedance of the cable is the main load impedance zero sequence current transformer, the zero sequence current transformer load impedance is around 2.5 Ω commonly, after many years of practice and test with small current line selection device form a complete set of zero sequence current transformer is chosen: 

 变比：150/5                容量：5VA

Variable ratio: 150/5 capacity: 5 va 

 或变比：40/1               容量：2.5VA

Or than: 40/1 capacity: 2.5 VA 

这两种零序电流互感器在负载阻抗2.5Ω时，一次1A，二次输出在20mA左右，一次40A时二次≥1A，没有严格的变比关系。

These two kinds of zero sequence current transformer in the load impedance 2.5 Ω, a 1 a, secondary output in about 20 ma, a 40 a secondary 1 a or higher, no strict than relationship. 

2、与DD11/60型继电器配套使用的零序电流互感器

2, with DD11/60 relay supporting the use of zero sequence current transformer 

DD11/60型继电器线圈并联阻抗为10Ω，COSΦ=0.8，我公司生产的ENR—LJ（K）××A型零序电流互感器是其配套产品，二次电流60mA时零序电流互感器一次电流≤4A。

DD11/60 type shunt impedance relay coil to 10 Ω, COS Φ = 0.8, our company produces the ENR has - LJ (K) (type A zero sequence current transformer is the product of form A complete set, when the secondary current is 60 ma zero sequence current transformer primary current 4 A or less. 

3、与DL11/0.2型继电器配套使用的零序电流互感器

3, with DL11/0.2 relay supporting the use of zero sequence current transformer 

DL11/0.2型继电器线圈并联阻抗为10Ω，COSΦ=0.8，我公司生产的ENR—LJ（K）××B型零序电流互感器是其配套产品，二次电流0.2A时零序电流互感器一次电流≤10A。

DL11/0.2 type shunt impedance relay coil to 10 Ω, COS Φ = 0.8, our company produces the ENR has - LJ (K) x x type B zero sequence current transformer is the product of form A complete set, when the secondary current is 0.2 A zero sequence current transformer primary current 10 A or less.