Table of contentsSection 1 Introduction..........................................................................15This manual............................................................................................ 15Intended audience.................................................................................. 15Product documentation...........................................................................16Product documentation set................................................................16Document revision history................................................................. 17Related documents............................................................................17Symbols and conventions.......................................................................18Symbols.............................................................................................18Document conventions...................................................................... 19Section 2 Application...........................................................................21REC650 application................................................................................ 21Available functions..................................................................................25Control and monitoring functions.......................................................25Back-up protection functions............................................................. 29Station communication...................................................................... 30Basic IED functions........................................................................... 31REC650 application examples................................................................32Adaptation to different applications................................................... 32Single breaker line bay, single or double busbar, in solidlygrounded network..............................................................................32Single breaker line bay, single or double busbar, in highimpedance grounded network........................................................... 33Bus coupler in a solidly grounded network........................................ 35Bus coupler in a high impedance grounded network.........................36Section 3 REC650 setting examples...................................................39Setting example when REC650 is used as back-up protection in atransformer protection application.......................................................... 39Calculating general settings for analogue inputs 8I 2U..................... 40Calculating settings for global base values GBASVAL......................42Calculating settings for instantaneous phase overcurrentprotection, HV-side, PHPIOC (50).....................................................42Calculating settings for four step phase overcurrent protection 3-phase output, HV-side, OC4PTOC (51_67)...................................... 43Calculating general settings ........................................................ 43Table of contents1Application manual
