Effects of SMES equipped STATCOM on distance relay ideal tripping characteristic

This paper presents the measured impedance at the relaying point in the presence of STATic synchronous COMpensator (STATCOM), one of the shunt connected Flexible Alternating Current Transmission System (FACTS) devices, which is equipped with a Superconductor Magnetic Energy Storage (SMES). The presence of SMES equipped STATCOM on a transmission line has a great influence on the measured impedance at the relaying point. The measured impedance itself depends on the power system structural conditions, pre-fault loading, and especially the ground fault resistance. In the presence of SMES equipped STATCOM, its structural and controlling parameters as well as its installation location affects the ideal tripping characteristic. Here, the measured impedance at the relaying point is evaluated due to the mentioned concerning parameters.