This article introduces the survey results of fault location technique in power systems. The power transmission line Fault Locator (FL) is an indispensable device for early determination of fault location on power transmission line. Several types of FL have been developed to date, including the pulse radar type, surge type and impedance type. The purpose of this article are to pick up overview of FL of the three types. Furthermore this article introduces about applied FL in field and the research trend of FL.
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