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零序电流互感器是用于电力电缆上的一种互感器，它的一次绕组为穿过互感器内孔的三相一次导体电缆（或是单相电缆），它的一次电流是一次三相电流的矢量和（在三相平衡时为0），当发生系统单相接地时或三相平衡时，矢量和不为0，零序电流互感器的二次有电流输出，可以供给保护装置，实现保护和监控。
Zero-sequence current transformer is a kind of transformer used in power cable. Its primary winding is a three-phase primary conductor cable (or single-phase cable) through the inner hole of the transformer. Its primary current is the vector sum of the primary three-phase current (0 at three-phase equilibrium), and the vector when the system is single-phase to earth or three-phase to balance. Quantity and not 0, zero sequence current transformer secondary current output, can be supplied to the protection device, to achieve protection and monitoring.
由于电缆自身绝缘，零序电流互感器外壳也是绝缘的，所以零序电流互感器可以使用在任一电压等级的电缆上。
Because the cable itself is insulated, the zero-sequence current transformer shell is also insulated, so the zero-sequence current transformer can be used in any voltage level of the cable.