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This paper discusses problems and the possible solutions for protecting series compensated transmission line with distance relays. The paper also takes into consideration the influence of the series compensation on the distance relays installed on the short lines adjacent to the compensated line. Starting from visualising the response of the distance relays, the paper proposes some simple but novel methods to secure and improve the distance relay response. The methods include new impedance and direction determining techniques, placement of CVT and setting considerations. The material presented in this paper is based on the authors experience in protecting series compensated lines with distance relays.

Visualising the Response of Distance Relays in the Series Compensated Transmission System - Understanding the Problems and some Practical Solutions.