The structures of two types of zero-sequence OCTs (ZOCT), i.e. hybrid ZOCT and whole-fiber ZOCT, suitable for cables and overhead lines respectively, are presented.

• 给出2种形式的零序光学电流传感器(ZOCT)结构，即组合型ZOCT与全光纤型ZOCT，分别适用于电缆线路和架空线路。