A STUDY ON RELAY SETTING FOR AT FEEDING SYSTEM PROTECTION USING PSCAD/EMTDC

초록

This paper presents simulation technique for relay setting of AT feeding system protection. To prove if relay setting value is proper, AT feeding system and various locomotives are modeled using PSCAD/EMTDC. Operation and fault data have been extracted by simulating various load operation and fault situations. Using these data, setting values of distance relay and △I fault selection device for protection of AT feeding circuit could be verified. And due to the inrush current of unloading transformer and increase of temporary maximum load current, the possibility of protection relay’s malfunction is shown.