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Fault location (FL) is one of the most important diagnostics tasks in transmission and distribution networks. Due to long distances of the power lines, the search and repair can take a long time, while modern microprocessor technology can help automate the FL process and give a precise (up to a span) location of the fault. The fault extinction time is reduced dramatically. In this report, the basic...
A new algorithm designated for locating faults on a double-circuit line is presented. It is assumed that the fault location function is incorporated into the current differential relay at the particular line end. Besides three-phase currents measured synchronously at both line ends, which are utilized by the protective relays, the fault locator is supplied with three-phase voltage from the local line...
Problems occur when zones overlap in the conventional step distance protection scheme. If the same zones from different relays overlap, discriminating between the real fault location and the virtual one is difficult, and malfunction can occur. In this case, the zone length or time delay is usually modified to separate the overlapped zones. However, these changes affect the coordination of the power...
Single-pole auto-reclosing is an approved method to enhance the reliability in transmission systems. But with increasing system voltage, the maximum line length, for which a common single-pole auto-reclosing is successful, decreases. Therefore this paper will show how single-pole auto-reclosing can also be applied in extra and ultra high voltage transmission systems, by extending the system with high-speed...
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