Analytical Approach to Study the Impacts of Mutual Coupling on Transmission Lines Protection Systems

TL;DR

This paper presents an analytical methodology to estimate and quantify the impact of mutual coupling on transmission line protection systems, using EMT simulations and a real ERCOT case study.

Contribution

It introduces a comprehensive analytical approach for assessing mutual coupling effects on various protective relays in power systems.

Findings

Mutual coupling significantly affects relay performance during faults.

The methodology accurately estimates mutual coupling magnitude in real scenarios.

Case study validates the effectiveness of the proposed analytical approach.

Abstract

While there are numerous literatures that have addressed the impact of mutual coupling on the reliability and security of protection schemes and have provided possible mitigation solutions, there has not been adequate research and documentation presenting a comprehensive analytical approach to 1) estimate the magnitude of mutual coupling and 2) quantify the adverse impact of mutual coupling in real-life scenarios under several system faults across various types of protective elements. This should be considered as the first stage of any mutual coupling related study preceding the second stage in which the mitigation against mutual coupling is to be developed. The proposed methodology can be used to study the impact of mutual coupling on ground overcurrent relays, ground and phase distance as well as pilot protection schemes. As part of the proposed approach, EMT simulation is utilized to quantify the extent of sub-transient overshoot and current reversal that may have adverse impact on the performance of studied relays. A real-life case study within the ERCOT network has been used to demonstrate the proposed study approach.