Dynamic Performance of Distance Relayson Series Compensated Transmission Lines using RTDS

Anil Kumar and Meera KS

CPRI, Bangalore, India

Accepted 23 October, 2017

Citation: Kumar A and Meera KS (2017). Scada Based Remote Monitoring and Data Acquisition for Energy Management. International Research Journal of Power and Energy Engineering, 3(2): 092-098.

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Copyright: © 2017. Kumar and Meera. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Abstract

Series compensation is installed in power system networks to increase power transfer capacity, improve the system stability, reduce system losses, improve voltage regulation and for achieving flexible power flow control. Distance relays are widely used as main or backup protection of transmission lines including series-compensated transmission lines. The performance of conventional distance relays is affected by series capacitors and cause certain protection issues. This paper briefly discusses the problems like voltage inversion, current inversion, overreach and under reach during the fault conditions specific to series compensated lines. The behavior of capacitor protection techniques is discussed with simulations performed using Real Time Digital Simulator (RTDS) simulator for a typical 400 kV system having series compensation. The analysis is based on Transmission Line fault simulations, internal and external to the 400-transmission line where the Fixed Series Compensation (FSC)is installed.

Keywords: Distance relay, series capacitor, MOV (Metal oxide varistor), voltage inversion, current inversion, overreach, Real Time Digital Simulator (RTDSTM).