GE 469

CHAPTER 7: TESTING
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 7–3
7.2 Hardware Functional Testing
7.2.1 Phase Current Accuracy Test
The 469 specification for phase current accuracy is ±0.5% of 2 × CT when the injected
current is less than 2 × CT. Perform the steps below to verify accuracy.
Z Alter the following settings:
S2 SYSTEM SETUP Z CURRENT SENSING Z PHASE CT PRIMARY: “1000 A”
Measured values should be ±10 A.
Z Inject the values shown in the table below.
Z Verify accuracy of the measured values.
Z View the measured values in:
A2 METERING DATA Z CURRENT METERING
7.2.2 Voltage Input Accuracy Test
The 469 specification for voltage input accuracy is ±0.5% of full scale (273 V). Perform the
steps below to verify accuracy.
Z Alter the following settings:
S2 SYSTEM SETUP ZV VOLTAGE SENSING Z VT CONNECTION TYPE: “Wye”
S2 SYSTEM SETUP ZV VOLTAGE SENSING ZV VOLTAGE TRANSFORMER RATIO: “10.00:1”
Measured values should be ±13.65 V.
Z Apply the voltage values shown in the table.
Z Verify accuracy of the measured values.
Z View the measured values in:
A2 METERING DATA ZV VOLTAGE METERING
INJECTED
CURRENT
1 A UNIT
INJECTED
CURRENT
5 A UNIT
EXPECTED
CURRENT
READING
MEASURED
CURRENT
PHASE A
MEASURED
CURRENT
PHASE B
MEASURED
CURRENT
PHASE C
0.1 A 0.5 A 100 A
0.2 A 1.0 A 200 A
0.5 A 2.5 A 500 A
1.0 A 5.0 A 1000 A
1.5 A 7.5 A 1500 A
2.0 A 10 A 2000 A
APPLIED
LINE-NEUTRAL
VOLTAGE
EXPECTED
VOLTAGE
READING
MEASURED
VOLTAGE A-N
MEASURED
VOLTAGE B-N
MEASURED
VOLTAGE C-N
30 V 300 V
50 V 500 V
100 V 1000 V
150 V 1500 V