Development of a Surge Type Fault Locator using the Hybrid Detection Type Fault Recorder

We have proposed the new surge type FL using hybrid detection type fault recorder to measure the location of a line fault precisely in the power system. This new recorder has a feature that the starting detection of the recorder is not a instantanceous value of a high speed data but a effective value of low sampling data. This new recorder has a high speed sampling part and a low speed sampling part. A high speed sampling part works a recording of surge data. On the other hand, a low speed sampling part works a detecting of trasmission line fault. The authors carried out field tests with this new recorder installed at plants and substation in the 275kV power transmission system of TEPCO (Tokyo Electric Power Company). And we obtained good results. This paper presents these results.