11-4
L30 Line Current Differential System
GE Multilin
11.1 TESTING
11 COMMISSIONING
11
11.1.4 LOCAL-REMOTE RELAY TESTS
a) DIRECT TRANSFER TRIP (DTT) TESTS
The direct transfer trip is a function by which one relay sends a signal to a remote relay to cause a trip of remote equipment.
The local relay trip outputs will close upon receiving a direct transfer trip from the remote relay. The test procedure is as fol-
lows:
1.
Ensure that relay will not issue any undesired signals to other equipment and all previous tests have been completed
successfully.
2.
Cycle power off/on in both relays.
3.
Verify and record that both relays indicate In Service on the faceplate display.
4.
Make the following setting change in the
SETTINGS
GROUPED ELEMENTS
LINE DIFFERENTIAL ELEMENT
CUR-
RENT DIFFERENTIAL
menu of both relays:
CURRENT DIFF FUNCTION
:
“Enabled”
5.
Verify and record that both relays have established communications by performing the following status check thorough
the
ACTUAL VALUES
STATUS
CHANNEL TESTS
menu:
CHANNEL 1(2) STATUS:
“OK”
6.
At the remote relay, make the following changes in the
SETTINGS
GROUPED ELEMENTS
LINE DIFFERENTIAL ELE-
MENT
CURRENT DIFFERENTIAL
menu:
CURRENT DIFF DTT:
“Enabled”
7.
At the Local relay, make the following changes in the
SETTINGS
INPUTS/OUTPUTS
CONTACT OUTPUT N1
menu:
CONTACT OUTPUT N1 OPERATE:
“
87L DIFF RECVD DTT A
”
CONTACT OUTPUT N2 OPERATE:
“
87L DIFF RECVD DTT B
”
CONTACT OUTPUT N3 OPERATE:
“
87L DIFF RECVD DTT C
”
8.
At the Local relay, verify that
ACTUAL VALUES
STATUS
CONTACT OUTPUTS
Cont Op N1
is in the “Off” state.
9.
Apply current to phase A of the remote relay and increase until 87L operates.
10. At the Local relay, observe
ACTUAL VALUES
STATUS
CONTACT OUTPUTS
Cont Op N1
is now in the “On” state.
11. Repeat steps 8 through 10 for phases A and B and observe Contact Outputs N2 and N3, respectively.
12. Repeat steps 8 through 11 with the Remote and Local relays inter-changed.
13. Make the following setting change in the
SETTINGS
GROUPED ELEMENTS
LINE DIFFERENTIAL ELEMENT
CUR-
RENT DIFFERENTIAL
menu of both relays:
CURRENT DIFF FUNCTION
:
“Disabled”
14. At the Remote relay, set
SETTINGS
INPUTS/OUTPUTS
CONTACT OUTPUT N1
CONTACT OUTPUT N1 OPERATE
to
the
CURRENT DIFF KEY DTT
operand.
15. At the Local relay, observe under the
ACTUAL VALUES
STATUS
CONTACT OUTPUTS
menu that
CONTACT OUTPUT
N1
,
N2
and
N3
are “Off”.
16. At the Remote relay, set
SETTINGS
TESTING
FORCE CONTACT INPUTS
FORCE Cont Ip N1
to “Closed”.
17. At the Local relay, observe under
ACTUAL VALUES
STATUS
CONTACT OUTPUTS
that
CONTACT OUTPUT N1
,
N2
and
N3
are now “On”.
18. At both the Local and Remote relays, return all settings to normal.
b) FINAL TESTS
As proper operation of the relay is fundamentally dependent on the correct installation and wiring of the CTs, it must be con-
firmed that correct data is brought into the relays by an on-load test in which simultaneous measurements of current and
voltage phasors are made at all line terminals. These phasors and differential currents can be monitored at the
ACTUAL VAL-
UES
METERING
87L DIFFERENTIAL CURRENT
menu where all current magnitudes and angles can be observed and con-
clusions of proper relay interconnections can be made.
Summary of Contents for L30
Page 10: ...x L30 Line Current Differential System GE Multilin TABLE OF CONTENTS ...
Page 30: ...1 20 L30 Line Current Differential System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 370: ...5 244 L30 Line Current Differential System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 464: ...A 10 L30 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 600: ...C 30 L30 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 610: ...D 10 L30 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 622: ...E 12 L30 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 634: ...F 12 L30 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Page 644: ...x L30 Line Current Differential System GE Multilin INDEX ...
