5-172
G60 Generator Protection System
GE Multilin
5.6 GROUPED ELEMENTS
5 SETTINGS
5
5.6.10 GENERATOR UNBALANCE
PATH: SETTINGS
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GROUPED ELEMENTS
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SETTING GROUP 1(6)
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GENERATOR UNBALANCE
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
nom
is the generator rated current and
K
is the negative-sequence capability constant nor-
mally provided by the generator manufacturer.
•
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
GEN UNBAL INOM
setting. It is typically set at the maximum continuous negative
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.
GENERATOR
UNBALANCE
GENERATOR UNBAL
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
GEN UNBAL SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
GEN UNBAL INOM:
0.800 pu
Range: 0.000 to 1.250 pu in steps of 0.001
MESSAGE
GEN UNBAL STG1
PICKUP: 8.00%
Range: 0.00 to 100.00% in steps of 0.01
MESSAGE
GEN UNBAL STG1
K-VALUE: 1.00
Range: 0.00 to 100.00 in steps of 0.01
MESSAGE
GEN UNBAL STG1 TMIN:
0.250 s
Range: 0.000 to 50.000 s in steps of 0.001
MESSAGE
GEN UNBAL STG1 TMAX:
600.00 s
Range: 0.0 to 1000.0 s in steps of 0.1
MESSAGE
GEN UNBAL STG1
K-RESET: 240.00 s
Range: 0.0 to 1000.0 s in steps of 0.1
MESSAGE
GEN UNBAL STG2
PICKUP: 3.0%
Range: 0.00 to 100.00% in steps of 0.01
MESSAGE
GEN UNBAL STG2 PKP
DELAY: 5.0 s
Range: 0.0 to 1000.0 s in steps of 0.1
MESSAGE
GEN UNBAL BLOCK:
Off
Range: FlexLogic™ operand
MESSAGE
GEN UNBAL TARGET:
Self-Reset
Range: Self-reset, Latched
,
Disabled
MESSAGE
GEN UNBAL EVENTS:
Disabled
Range: Enabled
,
Disabled
T
K
I
2
I
nom
⁄
(
)
2
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Summary of Contents for G60 UR Series
Page 2: ......
Page 4: ......
Page 12: ...xii G60 Generator Protection System GE Multilin TABLE OF CONTENTS ...
Page 32: ...1 20 G60 Generator Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 132: ...4 30 G60 Generator Protection System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Page 392: ...5 260 G60 Generator Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 418: ...6 26 G60 Generator Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 482: ...A 12 G60 Generator Protection System GE Multilin A 1 PARAMETER LISTS APPENDIXA A ...
Page 604: ...D 10 G60 Generator Protection System GE Multilin D 1 IEC 60870 5 104 APPENDIXD D ...
Page 616: ...E 12 G60 Generator Protection System GE Multilin E 2 DNP POINT LISTS APPENDIXE E ...
Page 634: ...x G60 Generator Protection System GE Multilin INDEX ...