Split Phase Protection (Ansi 50Sp) - GE G30 Instruction Manual

CHAPTER 5: SETTINGS

5.7.9 Split phase protection (ANSI 50SP)

SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  SPLIT PHASE
 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 differential protection, as there is no difference between the neutral and at-terminal currents. Split phase protection
can be applied to detect inter-turn faults when the generator is wound with two three-phase windings, each brought
separately out of the machine and connected in parallel. The currents in the two windings are compared, any difference
indicating 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).
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPLIT PHASE

FUNCTION: Disabled
SPLIT PHASE SOURCE:

SRC 1
SPLIT PHASE LOAD

SOURCE: SRC 2
SPLIT PHASE A

PICKUP: 0.200 pu
SPLIT PHASE A

OFFSET: 0.000 pu
SPLIT PHASE A SLOPE:

0.0%
SPLIT PHASE B

PICKUP: 0.200 pu
SPLIT PHASE B

OFFSET: 0.000 pu
SPLIT PHASE B SLOPE:

0.0%
SPLIT PHASE C

PICKUP: 0.200 pu
SPLIT PHASE C

OFFSET: 0.000 pu
SPLIT PHASE C SLOPE:

0.0%
SPLIT PHASE MIN

LOAD: 0.00 pu
SPLIT PHASE MODE:

Over
SPLIT PHASE DELAY:

0.000 s
SPLIT PHASE BLK:

Off
SPLIT PHASE TARGET:

Self-Reset
SPLIT PHASE EVENTS:

Disabled
GROUPED ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.020 to 1.500 pu in steps of 0.001
Range: 0.000 to 1.000 pu in steps of 0.001
Range: 0.0 to 100% in steps of 0.1
Range: 0.020 to 1.500 pu in steps of 0.001
Range: 0.000 to 1.000 pu in steps of 0.001
Range: 0.0 to 100% in steps of 0.1
Range: 0.020 to 1.500 pu in steps of 0.001
Range: 0.000 to 1.000 pu in steps of 0.001
Range: 0.0 to 100% in steps of 0.1
Range: 0.00 to 1.00 pu in steps of 0.01
Range: Over, Over-Under
Range: 0.000 to 65.535 s in steps of 0.001
Range: FlexLogic operand
Range: Self-reset, Latched , Disabled
Range: Enabled , Disabled
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