GE G60 UR Series, Instruction Manual

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5-174 G60 Generator Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
5.6.11 SPLIT PHASE PROTECTION
PATH: SETTINGS
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GROUPED ELEMENTS
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SETTING GROUP 1(6)
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SPLIT PHASE
Some generators, due to physical construction, have windings that consist of multiple adjacent turns. It is therefore possible
for faults to develop between turns on the same phase (inter-turn faults). These faults are not detected by the stator differ-
ential protection, as there is no difference between the neutral and at the terminal currents. Split phase protection may be
applied to detect inter-turn faults in the case that the generator is wound with two three-phase windings, each brought sep-
arately out of the machine and connected in parallel. The currents in the two windings are compared, any difference indicat-
ing an inter-turn fault.
The split phase element allows a separate pickup setting to be applied for each phase. Additionally, the pickup can be
biased by the load current (slope characteristic). Two modes of operation are supported (over and over-under).
„
SPLIT PHASE
„
SPLIT PHASE SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
SPLIT PHASE LOAD
SOURCE: SRC 2
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
SPLIT PHASE A
PICKUP: 0.200 pu
Range: 0.020 to 1.500 pu in steps of 0.001
MESSAGE
SPLIT PHASE A
OFFSET: 0.000 pu
Range: 0.000 to 1.000 pu in steps of 0.001
MESSAGE
SPLIT PHASE A SLOPE:
0.0%
Range: 0.0 to 100% in steps of 0.1
MESSAGE
SPLIT PHASE B
PICKUP: 0.200 pu
Range: 0.020 to 1.500 pu in steps of 0.001
MESSAGE
SPLIT PHASE B
OFFSET: 0.000 pu
Range: 0.000 to 1.000 pu in steps of 0.001
MESSAGE
SPLIT PHASE B SLOPE:
0.0%
Range: 0.0 to 100% in steps of 0.1
MESSAGE
SPLIT PHASE C
PICKUP: 0.200 pu
Range: 0.020 to 1.500 pu in steps of 0.001
MESSAGE
SPLIT PHASE C
OFFSET: 0.000 pu
Range: 0.000 to 1.000 pu in steps of 0.001
MESSAGE
SPLIT PHASE C SLOPE:
0.0%
Range: 0.0 to 100% in steps of 0.1
MESSAGE
SPLIT PHASE MIN
LOAD: 0.00 pu
Range: 0.00 to 1.00 pu in steps of 0.01
MESSAGE
SPLIT PHASE MODE:
Over
Range: Over, Over-Under
MESSAGE
SPLIT PHASE DELAY:
0.000 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
SPLIT PHASE BLK:
Off
Range: FlexLogic™ operand
MESSAGE
SPLIT PHASE TARGET:
Self-Reset
Range: Self-reset, Latched
,
Disabled
MESSAGE
SPLIT PHASE EVENTS:
Disabled
Range: Enabled
,
Disabled