Development of Fault Detector for 33KV Un-grounded Power Line

Abstract

We are developing fault section detect system for 33kv un-grouned power line. Fault section is obtained from relation of two point zero phase current on power line. This Fault detector is composed of optical current sensors and processing unit and solar battery system. The optical current sensor consists of a Faraday cell and a porcelain bushing. Zero phase current on processing unit is get through three phase composer with auto gain control and residual current eliminater.
This fault detector have a ability of 0.15A zero phase current detection in factory test. And in field test this fault detector detect earth fault in twice.