SEMINAR ON INTEGRATED POSITIONAL PROTECTION OF TRANSMISSION SYSTEMS USING GPS
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ABSTRACT

This paper presents a new technique for the protection of power transmission systems by using the Global Positioning System (GPS) and fault generated transients, the Integrated Positional Protection technique.A specially designed integrated positional protection relay, which contains a fault transient detection system together with a substation communication network, is connected to the power line.The relay detects the fault generated high frequency voltage transient signals and records the time instant corresponding to when the initial travelling wave generated by the fault arrives at that busbar. The communication unit is used to transmit and receive coded digital signals of the local information to and from the associated relay(s) in the system. At each substation, the relays determine the location of the fault by comparing the GPS time stamps measured locally with those received from the adjacent substations.

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