Multilin 469 Motor Management Relay ... - GE Digital Energy

APPLIED
LINE-NEUTRAL
VOLTAGE
200 V 2000 V
270 V 2700 V
7.2.3 Ground and Differential Accuracy Test
CHAPTER 7: TESTING
The 469 specification for differential current and 1 A/5 A ground current input accuracy is
±0.5% of 1 × CT for the 5 A input and 0.5% of 5 × CT for the 1 A input. Perform the steps
below to verify accuracy.
5A Input
Alter the following settings:
S2 SYSTEM SETUP CURRENT SENSING GROUND CT: “5A Secondary”
S2 SYSTEM SETUP CURRENT SENSING GROUND CT PRIMARY: “1000 A”
S2 SYSTEM SETUP CURRENT SENSING PHASE DIFFERENTIAL CT: “5A Secondary”
S2 SYSTEM SETUP CURRENT SENSING PHASE DIFFERENTIAL CT PRIMARY: “1000 A”
1A Input
Measured values should be ±5 A.
INJECTED
CURRENT
5 A UNIT
EXPECTED
VOLTAGE
READING
Inject the values shown in the table below into one phase only.
Verify accuracy of the measured values.
View the measured values in:
EXPECTED
CURRENT
READING
0.5 A 100 A
1.0 A 200 A
2.5 A 500 A
5.0 A 1000 A
A2 METERING DATA CURRENT METERING
Alter the following settings:
S2 SYSTEM SETUP CURRENT SENSING GROUND CT: “1A Secondary”
S2 SYSTEM SETUP CURRENT SENSING GROUND CT PRIMARY: “1000 A”
S2 SYSTEM SETUP CURRENT SENSING PHASE DIFFERENTIAL CT: “1A Secondary”
S2 SYSTEM SETUP CURRENT SENSING PHASE DIFFERENTIAL CT PRIMARY: “1000 A”
Measured values should be ±25 A.
MEASURED
VOLTAGE A-N
MEASURED
GROUND
CURRENT
Inject the values shown below into one phase only.
Verify accuracy of the measured values.
View the measured values in:
MEASURED
VOLTAGE B-N
MEASURED
VOLTAGE C-N
MEASURED DIFFERENTIAL
CURRENT
PHASE A PHASE B PHASE C
7–4 469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL