GE 469

GE Power Management 469 Motor Management Relay 5-9
5 ACTUAL VALUES 5.3 A2 METERING DATA
5
5.3 A2 METERING DATA 5.3.1 CURRENT METERING
All measured current values are displayed here. The
CURRENT UNBALANCE
is defined as the ratio of negative-
sequence to positive-sequence current,
I
2
/ I
1
when the motor is operating at a load ( I
avg
) greater than FLA. If
the motor
I
avg
is less than FLA, unbalance is defined as I
2
/ I
1
× I
avg
/ FLA. This derating is necessary to pre-
vent nuisance alarms and trips when a motor is lightly loaded. The
U/B BIASED MOTOR LOAD
value shows the
equivalent motor heating current caused by the unbalance k factor.
y
CURRENT METERING
y
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A: 0 B: 0
C: 0 Amps
Range: 0 to 100000 A
AVERAGE PHASE
CURRENT: 0 Amps
Range: 0 to 100000 A
MOTOR LOAD:
0.00 x FLA
Range: 0.00 to 20.00 x FLA
CURRENT UNBALANCE:
0%
Range: 0 to 99.99%
U/B BIASED MOTOR
LOAD: 0.00 x FLA
Range: 0.00 to 20.00 x FLA
GROUND CURRENT:
0.0 Amps
Range: 0.0 to 5000.0 A
Seen only if Ground CT has 1 A or 5 A secondary
GROUND CURRENT:
0.00 Amps
Range: 0.00 to 25.00 A
Seen only if Ground CT is 50:0.025
A: 0 B: 0
C: 0 Amps Diff.
Range: 0 to 5000 A
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