Locus of apparent impedance of distance protection in the presence of SSSC

This paper presents the measured impedance at the relaying point of compensated transmission lines with SSSC under different fault conditions. The locus of the apparent impedance under different system operation and fault condition is obtained whilst fault location and resistance are changed. It is shown that the presence of SSSC on a transmission line has a great influence on the apparent impedance, which itself is influenced by the line short circuit level, pre-fault loading, and especially the fault resistance. The structural and controlling parameters of SSSC, as well as its installation location, can affect the measured impedance and consequently the locus of apparent impedance. The paper derives a mathematical expression of the apparent impedance, which includes all the affecting parameters. Copyright © 2010 John Wiley & Sons, Ltd.

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