A2 Metering Data - GE 469 Instruction Manual

CHAPTER 6: ACTUAL VALUES
6.3

A2 Metering Data

6.3.1 Current Metering
 CURRENT
METERING
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL

PATH: ACTUAL VALUES
[] A:
C:
AVERAGE PHASE
MESSAGE
CURRENT: 0 Amps
MOTOR LOAD:
MESSAGE
0.00 x FLA
CURRENT UNBALANCE:
MESSAGE
0%
U/B BIASED MOTOR
MESSAGE
LOAD: 0.00 x FLA
GROUND CURRENT:
MESSAGE
0.00 Amps
A:
MESSAGE
C:
All measured current values are displayed here. The
ratio of negative-sequence to positive-sequence current, I
operating at a load (I ) greater than FLA. If the motor I
avg
defined as I / I × I / FLA. This derating is necessary to prevent nuisance alarms and
2 1 avg
trips when a motor is lightly loaded. The
equivalent motor heating current caused by the unbalance k factor.
When
NOMINAL SYSTEM FREQUENCY
is enabled (set to a non-zero value),
phase current RMS values. Phase angles are ignored. With sinusoidal phase inputs, this
produces values about two times the values produced by calculating I
smallest phase to largest phase is less than 70%, a fixed value 40%
is used. Derating still applies when the average load is less than FLA.

A2 METERING DATA CURRENT METERING
0 B: 0
0 Amps
0 B: 0
0 Amps Diff.
CURRENT UNBALANCE
U/B BIASED MOTOR LOAD
is set to "Variable", or
CURRENT UNBALANCE
Range: 0 to 100000 A
Range: 0 to 100000 A
Range: 0.00 to 20.00 x FLA
Range: 0.00 to 20.00 x FLA
Range: 0.00 to 5000.00 A. Not seen if
Ground CT is set as "None".
Range: 0 to 5000 A. Seen if Phase
Differential CT has 1A/5A
Secondary
is defined as the
/ I when the motor is
2 1
is less than FLA, unbalance is
avg
value shows the
MOTOR LOAD FILTER INTERVAL
is calculated from the ratio of
/I . If the ratio of the
2 1
CURRENT UNBALANCE
6–11