Relay Protection Coordination Analysis using Fault Current Measurements: A Case Study of Hydro Quebec Distribution Network
The arrival of modern protection relays on distribution networks offers us an excellent opportunity to better understand the performance of network protection and to efficiently identify coordination problems. The analysis of relay event reports helps establishing the source of unnecessary relay protection tripping. In this work, the analysis of measurements of digital over-current relays is conducted. The case study is focused on performing a macro level analysis of protection coordination on Hydro-Québec's distribution network. Additionally, a characterisation of short circuits has been performed. A list of observations followed by recommendations for improvement of relay protection strategy in distribution networks is presented using the results of this case study.