CHAPTER 5: SETTINGS GROUPED ELEMENTSG60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 5-26955.7.11 Split phase protection (ANSI 50P)SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) SPLIT PHASESome generators, due to physical construction, have windings that consist of multiple adjacent turns. It is thereforepossible for faults to develop between turns on the same phase (inter-turn faults). These faults are not detected by thestator differential protection, as there is no difference between the neutral and at-terminal currents. Split phase protectioncan be applied to detect inter-turn faults when the generator is wound with two three-phase windings, each broughtseparately out of the machine and connected in parallel. The currents in the two windings are compared, any differenceindicating an inter-turn fault.The split phase element allows a separate pickup setting to be applied for each phase. Additionally, the pickup can bebiased by the load current (slope characteristic). Two modes of operation are supported (over and over-under). SPLIT PHASE SPLIT PHASEFUNCTION: DisabledRange: Disabled, Enabled SPLIT PHASE SOURCE:SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4 SPLIT PHASE LOADSOURCE: SRC 2Range: SRC 1, SRC 2, SRC 3, SRC 4 SPLIT PHASE APICKUP: 0.200 puRange: 0.020 to 1.500 pu in steps of 0.001 SPLIT PHASE AOFFSET: 0.000 puRange: 0.000 to 1.000 pu in steps of 0.001 SPLIT PHASE A SLOPE:0.0%Range: 0.0 to 100% in steps of 0.1 SPLIT PHASE BPICKUP: 0.200 puRange: 0.020 to 1.500 pu in steps of 0.001 SPLIT PHASE BOFFSET: 0.000 puRange: 0.000 to 1.000 pu in steps of 0.001 SPLIT PHASE B SLOPE:0.0%Range: 0.0 to 100% in steps of 0.1 SPLIT PHASE CPICKUP: 0.200 puRange: 0.020 to 1.500 pu in steps of 0.001 SPLIT PHASE COFFSET: 0.000 puRange: 0.000 to 1.000 pu in steps of 0.001 SPLIT PHASE C SLOPE:0.0%Range: 0.0 to 100% in steps of 0.1 SPLIT PHASE MINLOAD: 0.00 puRange: 0.00 to 1.00 pu in steps of 0.01 SPLIT PHASE MODE:OverRange: Over, Over-Under SPLIT PHASE DELAY:0.000 sRange: 0.000 to 65.535 s in steps of 0.001 SPLIT PHASE BLK:OffRange: FlexLogic operand SPLIT PHASE TARGET:Self-ResetRange: Self-reset, Latched , Disabled SPLIT PHASE EVENTS:DisabledRange: Enabled , Disabled
