GE 469 Manual

GE Power Management 469 Motor Management Relay 7-3
7 TESTING 7.2 HARDWARE FUNCTIONAL TESTING
7
7.2.3 GROUND (1A/5A) AND DIFFERENTIAL ACCURACY TEST
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.
a) 5 A INPUT
1. Alter the following setpoints:
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
2. Measured values should be
±
5 A. Inject the values shown in the table below into one phase only and verify
accuracy of the measured values. View the measured values in:
A2 METERING DATA\CURRENT METERING
b) 1 A INPUT
1. Alter the following setpoints:
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
2. Measured values should be
±
25 A. Inject the values shown in the table below into one phase only and ver-
ify accuracy of the measured values. View the measured values in:
A2 METERING DATA\CURRENT METERING
Table 7–3: DIFFERENTIAL AND GROUND CURRENT TEST (5 A)
INJECTED
CURRENT
5 A UNIT
EXPECTED
CURRENT
READING
MEASURED
GROUND
CURRENT
MEASURED DIFFERENTIAL CURRENT
PHASE A PHASE B PHASE C
0.5 A 100 A
1.0 A 200 A
2.5 A 500 A
5.0 A 1000 A
Table 7–4: DIFFERENTIAL AND GROUND CURRENT TEST (1 A)
INJECTED
CURRENT
1 A UNIT
EXPECTED
CURRENT
READING
MEASURED
GROUND
CURRENT
MEASURED DIFFERENTIAL CURRENT
PHASE A PHASE B PHASE C
0.1 A 100 A
0.2 A 200 A
0.5 A 500 A
1.0 A 1000 A

GE 469 Specifications

General

Brand	GE
Model	469
Category	Relays
Language	English