Abstract
A new fault location system using optical current transducers to detect faulted sections in the bus bars of directly grounded 275kV substations has been developed. This system detects fault current by combining optical current transducers with wound type CTs. The new type optical current transducer applies a bulk type Faraday sensor to the combination of a windings around a magnetic iron core and a solenoid coil. The optical current transducer was capable of current measuring over 50kA. A current differential discriminator combining an optical current transducer and an wound type CT, verified the operational performance with 40kA currents. The intended level of fault detection performance was obtained. Based on these results, a system is being made for actual application in 275kV substations.
