Hardware Functional Testing; Output Current Accuracy; Phase Voltage Input Accuracy - GE 489 Instruction Manual

7 TESTING

7.2 HARDWARE FUNCTIONAL TESTING

The specification for output and neutral end current input is ±0.5% of 2 × CT when the injected current is less than 2 × CT.
Perform the steps below to verify accuracy.
1. Alter the following setpoint:
S2 SYSTEM SETUP\CURRENT SENSING\PHASE CT PRIMARY: 1000A
Measured values should be ±10 A. Inject the values shown in the table below and verify accuracy of the measured val-
2.
ues. View the measured values in:
A2 METERING DATA\CURRENT METERING
INJECTED CURRENT
1 A UNIT 5 A UNIT
0.1 A 0.5 A
0.2 A 1.0 A
0.5 A 2.5 A
1 A
1.5 A 7.5 A
2 A 10 A
The specification for phase voltage input accuracy is ±0.5% of full scale (200 V). Perform the steps below to verify accu-
racy.
1. Alter the following setpoints:
S2 SYSTEM SETUP\VOLTAGE SENSING\VT CONNECTION TYPE:
S2 SYSTEM SETUP\VOLTAGE SENSING\VOLTAGE TRANSFORMER RATIO:
Measured values should be ±1.0 V. Apply the voltage values shown in the table and verify accuracy of the measured
2.
values. View the measured values in:
A2 METERING DATA\VOLTAGE METERING
APPLIED LINE- EXPECTED VOLTAGE
NEUTRAL VOLTAGE
30 V
50 V
100 V
150 V
200 V
270 V
GE Power Management
EXPECTED
CURRENT
100 A
200 A
500 A
5 A 1000 A
1500 A
2000 A
READING
300 V
500 V
1000 V
1500 V
2000 V
2700 V
489 Generator Management Relay
7.2 HARDWARE FUNCTIONAL TESTING

7.2.1 OUTPUT CURRENT ACCURACY

MEASURED CURRENT
PHASE A PHASE B

7.2.2 PHASE VOLTAGE INPUT ACCURACY

Wye
10.00:1
MEASURED VOLTAGE
A-N B-N
PHASE C
C-N
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