1MRS 755539 Feeder Protection RelayOperator’s Manual - ANSI VersionREF 610499. AbbreviationsANSI American National Standards InstituteASCII American Standard Code for Information InterchangeCBFP Circuit-breaker failure protectionCPU Central processing unitCT Current transformerDI Digital InputHMI Human-Machine InterfaceIDMT Inverse definite minimum time characteristicIEC International Electrotechnical CommissionIRF Internal relay faultLCD Liquid Crystal DisplayLED Light-emitting diodePC Personal computerPO1, PO2, PO3 Trip outputsRTU Remote Terminal UnitSGB Switchgroup for digital inputsSGF Switchgroup for functionsSGL Switchgroup for LEDsSGR Switchgroup for output contactsSO1, SO2 Non-trip outputsTCS Trip-circuit supervision
