Transmission Line Fault Location

Fault location on transmission lines is an important application in power systems. It allows operators, as well as protection and maintenance staff, to pinpoint where the fault has occurred and initiate corresponding effort to repair and restore the affected transmission line. Once the protective relays have detected a transmission line fault and tripped (disconnected) the line by issuing a control command to circuit breakers, the fault location application determines the location by measuring voltages and currents at either or both transmission line ends. Over the years, many different fault location techniques were developed, but very few have used synchronized samples or synchrophasors. Most recently, the use of synchronized samples and phasors in fault location has become a subject of interest since the technology has matured and is readily available.

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