GE Multilin 745 Instruction Manual

Table of Contents 745Generator Management Relayhttp://www.GEindustrial.com/multilin viiGE MultilinVoltage Input ....................................................................................................................................... 7-7Transformer Type Selection .............................................................................................................. 7-8Ambient Temperature Input .............................................................................................................. 7-9Analog Outputs ................................................................................................................................. 7-11Tap Position....................................................................................................................................... 7-11Protection SchemesPrecautions........................................................................................................................................ 7-11Harmonic Restrained Percent Differential....................................................................................... 7-11Instantaneous Differential Protection.............................................................................................. 7-17Phase Time Overcurrent................................................................................................................... 7-18Phase Instantaneous Overcurrent 1 ................................................................................................ 7-20Phase Instantaneous Overcurrent 2 ................................................................................................ 7-20Neutral Time Overcurrent ................................................................................................................ 7-21Neutral Instantaneous Overcurrent 1 .............................................................................................. 7-22Neutral Instantaneous Overcurrent 2 .............................................................................................. 7-23Ground Time Overcurrent................................................................................................................ 7-23Ground Instantaneous Overcurrent 1.............................................................................................. 7-25Ground Instantaneous Overcurrent 2.............................................................................................. 7-26Restricted Ground Fault Polarity Test ............................................................................................. 7-26Restricted Ground Fault Element Test ............................................................................................ 7-27Negative Sequence Time Overcurrent............................................................................................ 7-28Negative Sequence Instantaneous Overcurrent............................................................................. 7-30Frequency .......................................................................................................................................... 7-31Overexcitation ................................................................................................................................... 7-36Insulation Aging ................................................................................................................................ 7-37Tap Monitor Failure .......................................................................................................................... 7-38Auxiliary Protection and Monitoring FunctionsTHD Level Scheme............................................................................................................................ 7-38Harmonic Derating Function ............................................................................................................ 7-39Transformer Overload ...................................................................................................................... 7-40Placing the Relay Into ServicePrecautions........................................................................................................................................ 7-40Procedure .......................................................................................................................................... 7-40APPENDIX Change NotesRevision History .................................................................................................................................. 8-1Changes to the 745 Manual ............................................................................................................... 8-1EU Declaration of ConformityGE Multilin WarrantyWarranty Statement ........................................................................................................................... 8-3INDEX