Ge Power Management Hgf Ground Accuracy Test; Neutral Voltage (3Rd Harmonic) Accuracy Test - GE 489 Instruction Manual

7 TESTING
The specification for GE Power Management HGF 50:0.025 ground current input accuracy is ±0.5% of 2 × CT rated pri-
mary (25 A). Perform the steps below to verify accuracy.
1. Alter the following setpoint:
S2 SYSTEM SETUP\CURRENT SENSING\GROUND CT: 50:0.025 CT
Measured values should be ±0.25 A. Inject the values shown in the table below either as primary values into a GE
2.
Power Management 50:0.025 Core Balance CT or as secondary values that simulate the core balance CT. Verify accu-
racy of the measured values in:
A2 METERING DATA\CURRENT METERING
INJECTED CURRENT
PRIMARY 50:0.025 CT
0.25 A
1 A
5 A
10 A
The 489 specification for neutral voltage (3rd harmonic) accuracy is ±0.5% of full scale (100 V). Perform the steps below to
verify accuracy.
1. Alter the following setpoints:
S2 SYSTEM SETUP\VOLTAGE SENSING\NEUTRAL VOLTAGE TRANSFORMER:
S2 SYSTEM SETUP\VOLTAGE SENSING\NEUTRAL V.T. RATIO:
S2 SYSTEM SETUP\GEN. PARAMETERS\GENERATOR NOMINAL FREQUENCY:
Measured values should be ±5.0 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 NEUTRAL
VOLTAGE AT 180 HZ
10 V
30 V
50 V
GE Power Management

7.3.6 GE POWER MANAGEMENT HGF GROUND ACCURACY TEST

SECONDARY
0.125 mA
0.5 mA
2.5 mA
5 mA

7.3.7 NEUTRAL VOLTAGE (3RD HARMONIC) ACCURACY TEST

EXPECTED NEUTRAL MEASURED NEUTRAL
VOLTAGE
100 V
300 V
500 V
489 Generator Management Relay
7.3 ADDITIONAL FUNCTIONAL TESTING
CURRENT READING
EXPECTED MEASURED
0.25 A
1.00 A
5.00 A
10.00 A
Yes
10.00:1
60 Hz
VOLTAGE
7
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