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Operation Manual 37107F
MFR 3 - Multi Function Relay
Page 106/165
© Woodward
Generator Load Imbalance Monitoring
NOTE
All percentage indications of the current are in relation to the generator rated current (Parameter 29).
Function:
"Generator load imbalance not within the permissible range"
The threshold value, expressed as a percentage,specifies the permissible deviation of the current in a conductor
from the calculated mean value of all three-conductor currents. If the measured value is greater than the threshold
value, an alarm is issued.
Parameter
150
Load unbalance
Monitoring ON
Unbalanced load
ON/OFF
ON
................ Generator load imbalance monitoring is enabled. The subsequent
screens of this function are displayed.
OFF
.............. Generator load imbalance monitoring is not performed. The subse-
quent screens of this function are not displayed.
Parameter
151
Load unbalance
max. 000%
Unbalanced load: limit
0 to 100 %
The value configured in this screen is a percentage of the configured generator
rated current. If this level is reached or exceeded, the unit issues an alarm and
opens the GCB.
Tripping of class F3 alarm
Parameter
152
Load unbalance
Delay 00.00s
Unbalanced load: delay
0.02 to 99.98 s
The load imbalance monitoring threshold limit must be exceeded, without interrup-
tion, for the time period configured here before the configured relay will be ener-
gized.