7–4
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 7: TESTING
7.2.3
Ground 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.
5 A Input
Z
Alter the following settings:
S2 SYSTEM SETUP
Z
CURRENT SENSING
ZV
GROUND CT:
“5A Secondary”
S2 SYSTEM SETUP
Z
CURRENT SENSING
ZV
GROUND CT PRIMARY:
“1000 A”
S2 SYSTEM SETUP
Z
CURRENT SENSING
ZV
PHASE DIFFERENTIAL CT:
“5A Secondary”
S2 SYSTEM SETUP
Z
CURRENT SENSING
ZV
PHASE DIFFERENTIAL CT PRIMARY:
“1000 A”
Measured values should be
±
5 A.
Z
Inject the values shown in the table below into one phase only.
Z
Verify accuracy of the measured values.
Z
View the measured values in:
A2 METERING DATA
Z
CURRENT METERING
1 A Input
Z
Alter the following settings:
S2 SYSTEM SETUP
Z
CURRENT SENSING
ZV
GROUND CT:
“1A Secondary”
S2 SYSTEM SETUP
Z
CURRENT SENSING
ZV
GROUND CT PRIMARY:
“1000 A”
S2 SYSTEM SETUP
Z
CURRENT SENSING
ZV
PHASE DIFFERENTIAL CT:
“1A Secondary”
S2 SYSTEM SETUP
Z
CURRENT SENSING
ZV
PHASE DIFFERENTIAL CT PRIMARY:
“1000 A”
Measured values should be
±
25 A.
Z
Inject the values shown below into one phase only.
Z
Verify accuracy of the measured values.
Z
View the measured values in:
200 V
2000 V
270 V
2700 V
APPLIED
LINE-NEUTRAL
VOLTAGE
EXPECTED
VOLTAGE
READING
MEASURED
VOLTAGE A-N
MEASURED
VOLTAGE B-N
MEASURED
VOLTAGE C-N
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
Summary of Contents for 469
Page 62: ...2 16 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 2 INTRODUCTION ...
Page 90: ...3 28 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 3 INSTALLATION ...
Page 292: ...6 42 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 6 ACTUAL VALUES ...
Page 313: ...A APPENDIX 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL A 7 HGF5C 808841A1 HGF8 808842A1 ...
Page 315: ...A APPENDIX 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL A 9 808712A1 CDR ...
Page 320: ...A 14 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL A APPENDIX ...