零序电流互感器在电力系统产生零序接地电流时与继电保护装置或信号配合使用，使装置元件动作，实现保护或监控。
Zero sequence current transformer is used in conjunction with relay protection devices or signals when generating zero sequence grounding current in power system, so that device elements can be moved to achieve protection or monitoring.
HS-LJK、HS-LXK系列零序电流互感器是电缆型,采用ABS工程塑料外壳、树脂浇注成全密封；使用绝缘油制冷切割工艺，有效避免了互感器在长期使用过程中的锈蚀。绝缘性能好，外形美观。具有灵敏度高、线性度好、运行可靠、安装方便等特点。其性能优于一般的零序电流互感器，使用范围广泛，不仅适用于电磁型继电保护，还能适用于电子和微机保护装置。用户可根据系统的运行方式，中性点有效接地或中性点非有效接地的不同，选用相适应的零序电流互感器。
HS-LJK and HS-LXK series zero sequence current transformers are cable type. They are made of ABS engineering plastic shell and resin casted completely sealed. The insulation oil is used for cooling and cutting process, which effectively avoids corrosion of transformers in long term operation. Good insulation and beautiful appearance. It has the characteristics of high sensitivity, good linearity, reliable operation, convenient installation and so on. Its performance is better than the general zero sequence current transformer, which is widely used, not only for electromagnetic relay protection, but also for electronic and microcomputer protection devices. According to the operating mode of the system, the neutral point is effectively grounded or the neutral point is non effective grounding, the adaptive zero sequence current transformer can be selected.