Relationships between setting parameter Base Current, CTrated primary current and minimum pickup of a protection IED.. 51Setting of voltage channels......................................................... 51Example................................................................................. 51Examples how to connect, configure and set VT inputsfor most commonly used VT connections.............................. 52Examples on how to connect a three phase-to-earthconnected VT to the IED........................................................ 53Example on how to connect a phase-to-phaseconnected VT to the IED........................................................ 55Example on how to connect an open delta VT to the IEDfor high impedance earthed or unearthed networks...............57Example how to connect the open delta VT to the IEDfor low impedance earthed or solidly earthedpower systems....................................................................... 60Section 5 Local HMI....................................................................... 63Display..............................................................................................64LEDs.................................................................................................66Keypad............................................................................................. 67Local HMI functionality..................................................................... 69Protection and alarm indication................................................... 69Parameter management .............................................................70Front communication................................................................... 71Section 6 Multipurpose protection.................................................. 73General current and voltage protection CVGAPC............................ 73Identification................................................................................ 73Application................................................................................... 73Current and voltage selection for CVGAPC function..............74Base quantities for CVGAPC function....................................77Application possibilities.......................................................... 77Inadvertent generator energization........................................ 78Setting guidelines........................................................................ 79Directional negative sequence overcurrent protection........... 79Negative sequence overcurrent protection.............................81Generator stator overload protection in accordance withIEC or ANSI standards........................................................... 83Open phase protection for transformer, lines orgenerators and circuit breaker head flashover protectionfor generators......................................................................... 85Voltage restrained overcurrent protection for generatorand step-up transformer......................................................... 86Loss of excitation protection for a generator.......................... 87Section 7 Secondary system supervision.......................................89Table of contents2 Bay control REC650 2.2 IECApplication manual
