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ABSTRACT: This is a new technique for the protection of transmission systems by using the global positioning system (GPS) and fault generated transients. In this scheme the relay contains a fault transient detection system together with a communication unit, which is connected to the power line through the high voltage coupling capacitors of the CVT. Relays are installed at each bus bar in a transmission network. These detect the fault generated high frequency voltage transient signals and record the time instant corresponding to when the initial travelling wave generated by the fault arrives at the bus bar. The decision to trip is based on the components as they propagate through the system. The communication unit is used to transmit and receive coded digital signals of the local information to and from the associated relays in the system .At each substation relay determine the location of the fault by comparing the GPS time stay measured locally with those received from the adjacent substations, extensive simulation studies presented here demonstrate feasibility of the scheme.
Keywords- GPS, Fault detection, Transient analysis, Transient wave based protection scheme, fault current, signal processing.
INTRODUCTION:
Accurate location of faults on power transmission systems can save time and resources for the electric utility industry. Line searches for faults are costly and can be inconclusive. Accurate information needs to be acquired quickly in a form most useful to the power system operator communicating to field personnel.
To achieve this accuracy, a complete system of fault location technology, hardware, communications, and software systems can be designed. Technology is available which can help determine fault location to within a transmission span of 300 meters. Reliable self monitoring hardware can be configured for installation sites with varying geographic and environmental conditions. Communications systems can retrieve fault location
Keywords- GPS, Fault detection, Transient analysis, Transient wave based protection scheme, fault current, signal processing.
INTRODUCTION:
Accurate location of faults on power transmission systems can save time and resources for the electric utility industry. Line searches for faults are costly and can be inconclusive. Accurate information needs to be acquired quickly in a form most useful to the power system operator communicating to field personnel.
To achieve this accuracy, a complete system of fault location technology, hardware, communications, and software systems can be designed. Technology is available which can help determine fault location to within a transmission span of 300 meters. Reliable self monitoring hardware can be configured for installation sites with varying geographic and environmental conditions. Communications systems can retrieve fault location
References: [1] http://www.seminarprojects.com [2] http://en.wikipedia.org [3] http://www.howstuffworks.com [4] http://www.gpsmagazine.com [5] http://www.tycho.usno.org [6] http://www.google.co.in