2–22 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUALELECTRICAL INSTALLATION CHAPTER 2: INSTALLATIONFigure 2-22: Sensitive Ground InputsAlternatively, the 50:0.025 ground CT input has been designed for sensitive ground currentdetection on high resistance grounded systems where the GE Digital Energy 50:0.025 core-balance CT is to be used.For example, in mining applications where earth leakage current must be measured forpersonnel safety, primary ground current as low as 0.5 A primary may be detected withthe GE Digital Energy 50:0.025 CT. Only one ground CT input tap must be used on a givenunit. Note that when this CT input is selected for the Ground Fault function, fixed ratio of50:0.025 A is used by the relay.Figure 2-23: Sensitive Ground Current Input Connections892774A2.cdr8 SeriesJ1J2J3J4J5K7J6K8K7 K8K8 K7894078A2.cdrK7 K8MACHINESENSITIVEGROUNDIsgSENSITIVE GROUND INPUTWITH ZERO SEQUENCE CTGE 50:0.025core-balance CT
