LXK-Φ (80,120,140,160,200,240) zero-sequence current transformer current transformer in this series is suitable for indoor, rated frequency 50Hz or 60Hz, rated voltage 35KV and below the small ground current system for phase cable grounding protection. Also supporting the use of the relay. When installing the transformer can be divided into two halves, and then merge into one, to hold fast to get stuck with a hoop. Can be installed in the state without power. This type of a main transformer insulation from the cable that product is only secondary winding insulation performance test, the secondary winding to ground voltage is 3KV one minute.