Study of distance relays with fault resistance compensation for unbalanced systems

Hamid Asghari Rad and Mehrdad Ahmadi Kamarposhti

doi:10.17485/ijst/2011/v4i12.3

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Study of distance relays with fault resistance compensation for unbalanced systems

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2011/v4i12.3

Year: 2011, Volume: 4, Issue: 12, Pages: 1700-1703

Original Article

Study of distance relays with fault resistance compensation for unbalanced systems

Hamid Asghari Rad and Mehrdad Ahmadi Kamarposhti^*

Department of Electrical Engineering, Jouybar Branch, Islamic Azad University, Jouybar, Iran
[email protected]

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Fault resistance is a determinant quantity in distance relays. If this resistance is not considered it may cause wrong operation of relays. Moreover, unbalanced loads and non-symmetrical lines can affect a distance relay performance. In this paper we present a new algorithm to increase the accuracy and improve the efficiency of distance relays. The method proposed is based on phase coordination and utilizing from fault resistance estimation.
Keywords: Fault diagnosis, Fault resistance, Power system faults, Power system protection.