Multilin SR469 - Ground (1 A;5 A) and Differential Accuracy Test

7. TESTING HARDWARE FUNCTIONAL TESTING
7-3
7.2.3 GROUND (1A/5A) AND DIFFERENTIAL ACCURACY TEST
The SR469 specification for differential current and 1A/5A ground current input accuracy is ±0.5% of 1xCT for the 5A input and 0.5% of 5xCT
for the 1A input. Perform the steps below to verify accuracy.
5A INPUT
1. Alter the following setpoints:
SETPOINT S2:SYSTEM SETUP\CURRENT SENSING\GROUND CT: 5A Secondary
SETPOINT S2:SYSTEM SETUP\CURRENT SENSING\GROUND CT PRIMARY: 1000 A
SETPOINT S2:SYSTEM SETUP\CURRENT SENSING\PHASE DIFFERENTIAL CT: 5A Secondary
SETPOINT S2:SYSTEM SETUP\CURRENT SENSING\PHASE DIFFERENTIAL CT PRIMARY: 1000 A
2. Measured values should be ±5A. Inject the values shown in the table below into one phase only and verify accuracy of the measured
values. View the measured values in:
ACTUAL VALUES A2:\METERING DATA\CURRENT METERING
Table 7-3 DIFFERENTIAL AND GROUND CURRENT TEST (5A)
INJECTED
CURRENT
5 A UNIT
(A)
EXPECTED
CURRENT
READING
(A)
MEASURED
GROUND
CURRENT
(A)
MEASURED
DIFFERENTIAL
CURRENT
PHASE A
(A)
MEASURED
DIFFERENTIAL
CURRENT
PHASE B
(A)
MEASURED
DIFFERENTIAL
CURRENT
PHASE C
(A)
0.5 100
1.0 200
2.5 500
5 1000
1A INPUT
1. Alter the following setpoints:
SETPOINT S2:SYSTEM SETUP\CURRENT SENSING\GROUND CT: 1A Secondary
SETPOINT S2:SYSTEM SETUP\CURRENT SENSING\GROUND CT PRIMARY: 1000 A
SETPOINT S2:SYSTEM SETUP\CURRENT SENSING\PHASE DIFFERENTIAL CT: 1A Secondary
SETPOINT S2:SYSTEM SETUP\CURRENT SENSING\PHASE DIFFERENTIAL CT PRIMARY: 1000 A
2. Measured values should be ±25A. Inject the values shown in the table below into one phase only and verify accuracy of the measured
values. View the measured values in:
ACTUAL VALUES A2:\METERING DATA\CURRENT METERING
Table 7-4 DIFFERENTIAL AND GROUND CURRENT TEST (1A)
INJECTED
CURRENT
1 A UNIT
(A)
EXPECTED
CURRENT
READING
(A)
MEASURED
GROUND
CURRENT
(A)
MEASURED
DIFFERENTIAL
CURRENT
PHASE A
(A)
MEASURED
DIFFERENTIAL
CURRENT
PHASE B
(A)
MEASURED
DIFFERENTIAL
CURRENT
PHASE C
(A)
0.1 100
0.2 200
0.5 500
1 1000