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For a long UHV line with large distributed capacitance, the lumped parameter model of SC line is no longer valid. The apparent impedances of distance relay on series compensated line are derived and analyzed in details based on the distributed parameter model. Results show that the apparent impedances are influenced by the location of series capacitors. The sensitivity of relays is reduced largely...
In this paper the performance of a new fault component impedance distance relay based on voltage amplitude comparison is evaluated and its capability to mitigate the impact of UPFC on the apparent impedance measured by the relay is analyzed. As the impact of shunt branch of UPFC on the apparent impedance is mainly due to the fault resistance; thereby the proposed relay can perform better than the...
This paper proposes a new protection scheme for transmission lines equipped with UPFC based on the synchronized phasor measurements at both ends of the line. The fault detection and location indices based on sequence components are derived and used to discriminate the internal and external fault events accurately. The time for identifying an internal fault is well below 1/2 cycle. The performance...
The chief advantage that the distance relay has over current-only based line protection schemes is its ability to provide a defined zone of protection without the need for a communications channel - a so-called direct tripping, under-reaching zone. This zone must operate for faults within its zone of coverage with no appreciable time delay and restrain itself for all faults beyond its reach. It must...
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