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零序电流过滤器接在相间保护用的电流互感器中性线上，不用专门的互感器。互感器可接成三个单相、三相五线制，或者接在三相电缆线外。
Zero-sequence current filters are connected to neutral lines of current transformers for mutual zhongyaogui.71ix.comzhenkongdai.37ix.com.cnshuitong.71ix.comdibanms.37ix.com.cn langan.37ix.com.cnbaiyangdian.37ix.com.cnprotection without special transformers. Transformers can be connected into three single-phase, three-phase, five-wire systems or outside three-phase cable lines.
一般把接在三相线缆外的，特称为零序电流互感器区别是过滤器中会有不平衡电流（三相不对称运行，三次谐波，零序过滤器本身的励磁电流    导致的），发生相见短路时不平衡电流最大，接线复杂。正常运行无接地短路时，过滤器继电器电流为三相励磁电流和除以变比，互感器继电器电流为三倍零序电流。
Generally connected to three-phase cable, the difference is that there will be unbalanced current in the filter (caused by three-phase asymmetric operation, third harmonic, excitation current of zero-sequence filter itself). When short circuit occurs, unbalanced current is the largest and wiring is complex. When there is no grounding short circuit in normal operation, the current of filter relay is three-phase excitation current and divided by conversion ratio, and the current of transformer relay is three times zero sequence current.