Benefits of Applying Point-on-Wave Closing Fault Interrupters in Distribution Networks

This paper presents the impact of using a point-on-wave (POW) closing fault interrupter versus a conventional recloser during fault testing on distribution networks. It will demonstrate the effectiveness of using a POW-closing fault interrupter in reducing downstream transformer magnetizing current using a simple PSCAD model; eliminating repeat through-faults for the upstream substation transformer including a proposed approach to the expected life extension from reducing electrical and mechanical stress. The paper will also explore the added benefits of POW-closing fault interrupters in coordination improvement and minimising the risk of closing onto a fault during loop restoration.