Modelling an Inverse Definite Minimum Time Overcurrent (IDMT) relay protection discrimination schemes for power system networks using PSCAD

Ruzi, Muhammad Mirzan (2023) Modelling an Inverse Definite Minimum Time Overcurrent (IDMT) relay protection discrimination schemes for power system networks using PSCAD. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This thesis focuses on modeling an Inverse Definite Minimum Time (IDMT) overcurrent relay protection discrimination scheme for power system networks using PSCAD software. Overcurrent protection is essential in power systems to detect and mitigate faults, ensuring the reliability and stability of the network. Effective relay coordination is crucial to achieve selective and coordinated operation during fault conditions. This thesis presents an in-depth analysis of various factors that significantly influence the selection of IDMT overcurrent protection schemes for radial networks. The proposed protection scheme is rigorously tested using PSCAD, considering two types of faults: fault between Red to Yellow to Blue and fault between Red to Blue to Yellow to Earth. For simulation purposes, the IEC-255-3 std. moderately inverse IDMT curve characteristic is chosen, and the Power System Computer-Aided Design (PSCAD) software is utilized. The simulation results are compared with the calculated values of Pickup Current/Plug Setting (PS) and Time Multiplier Settings (TMS), demonstrating close agreement between the two. This validation confirms the reliability and accuracy of the calculated parameters for the IDMT relay protection scheme. The results affirm the trustworthiness of the calculated PS and TMS values, enabling power system engineers to implement effective and reliable protection schemes for power system networks.

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