5 SETTINGS
PATH: SETTINGS
GROUPED ELEMENTS
GENERATOR
UNBALANCE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The generator unbalance element protects the machine from rotor damage due to excessive negative-sequence current.
The element has an inverse time stage which is typically used for tripping and a definite time stage typically used for alarm
purposes. The inverse time stage operating characteristic is defined by the following equation:
where I
K
T
-------------------------- -
=
mally provided by the generator manufacturer.
2
I
I
2
nom
•
GEN UNBAL INOM: This setting is the rated full load current of the machine.
•
GEN UNBAL STG1 PICKUP: This setting defines the pickup of the stage 1 element expressed as a percentage of the
nominal current as specified by
sequence current rating of the machine.
•
GEN UNBAL STG1 K-VALUE: This setting is the negative sequence capability constant. This value is normally pro-
vided by the generator manufacturer (refer to ANSI C50.13 for details).
•
GEN UNBAL STG1 TMIN: This is the minimum operate time of the stage 1 element. The stage will not operate before
this time expires. This is set to prevent false trips for faults that would be cleared normally by system protections.
•
GEN UNBAL STG1 TMAX: This is the maximum operate time of the stage 1 element. This setting can be applied to
limit the maximum tripping time for low level unbalances.
GE Multilin
SETTING GROUP 1(6)
GENERATOR UNBAL
FUNCTION: Disabled
GEN UNBAL SOURCE:
SRC 1
GEN UNBAL INOM:
0.800 pu
GEN UNBAL STG1
PICKUP: 8.00%
GEN UNBAL STG1
K-VALUE: 1.00
GEN UNBAL STG1 TMIN:
0.250 s
GEN UNBAL STG1 TMAX:
600.00 s
GEN UNBAL STG1
K-RESET: 240.00 s
GEN UNBAL STG2
PICKUP: 3.0%
GEN UNBAL STG2 PKP
DELAY: 5.0 s
GEN UNBAL BLK:
Off
GEN UNBAL TARGET:
Self-Reset
GEN UNBAL EVENTS:
Disabled
is the generator rated current and K is the negative-sequence capability constant nor-
nom
setting. It is typically set at the maximum continuous negative
GEN UNBAL INOM
G60 Generator Protection System
5.6 GROUPED ELEMENTS
5.6.10 GENERATOR UNBALANCE
GENERATOR UNBALANCE
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.000 to 1.250 pu in steps of 0.001
Range: 0.00 to 100.00% in steps of 0.01
Range: 0.00 to 100.00 in steps of 0.01
Range: 0.000 to 50.000 s in steps of 0.001
Range: 0.0 to 1000.0 s in steps of 0.1
Range: 0.0 to 1000.0 s in steps of 0.1
Range: 0.00 to 100.00% in steps of 0.01
Range: 0.0 to 1000.0 s in steps of 0.1
Range: FlexLogic™ operand
Range: Self-reset, Latched
,
Range: Enabled
Disabled
5
,
Disabled
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