This paper describes methods that have been developed to validate relay models within the EMT simulation program used by Eskom. The paper describes how, with a combination of carefully-designed study-system models, and real-time simulator testing, the models used day-to-day by protection engineers in the utility can be validated against actual relay performance under controlled, but representative conditions, and any shortcomings in these models rectified accordingly. Confidence established in these models is essential for system operation investigations, where a key part of the process is injecting these relay models with fault recordings of incidents being investigated by protection engineers on 24-hour standby for the utility’s National Control Centre.
A. Bartylak, B. Rigby, Presented at South African Power Systems Protection Conference, Johannesburg, SA, November 14-16, 2012
KEYWORDS: protection relay models, EMT studies, EMT simulation, hardware-in-the-loop testing