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Local-remote Relay Tests - GE UR Series Instruction Manual

Line differential relay.
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10.9 L90 COMMISSIONING TESTS
Download the L90 Test software from the GE Power Management website (www.GEindustrial.com/pm) or con-
tact GE Power Management for information about the L90 current differential test program which allows the user to
NOTE
simulate different operating conditions for verifying correct responses of the relays during commissioning activities.
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.
TEST PROCEDURE:
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 both relays:
SETTINGS / GROUPED ELEMENTS / LINE DIFFERENTIAL ELEMENTS / CURRENT DIFFERENTIAL / FUNCTION:
5.
Verify and record that both relays have established communications by performing the following status check:
ACTUAL VALUES / STATUS / CHANNEL TESTS / CHANNEL 1(2) STATUS:
6.
At the remote relay, make the following setting change:
SETTINGS / GROUPED ELEMENTS / LINE DIFFERENTIAL ELEMENTS / CURRENT DIFFERENTIAL DTT:
7.
At the Local relay set"
SETTINGS / INPUTS/OUTPUTS / CONTACT OUTPUT N1
SETTINGS / INPUTS/OUTPUTS / CONTACT OUTPUT N2
SETTINGS / INPUTS/OUTPUTS / CONTACT OUTPUT N3
8.
At the Local relay, observe
9.
Apply current to phase A of the remote relay and increase until 87L operates.
10. At the Local relay, observe
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 both relays:
SETTINGS / GROUPED ELEMENTS / CURRENT DIFFERENTIAL / FUNCTION: "
14. At the Remote relay, set
15. At the Local relay, observe under
"Off".
16. At the Remote relay, set
17. At the Local relay, observe under
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
VALUES / METERING / 87L DIFFERENTIAL CURRENT
10
clusions of proper relay interconnections can be made.
10-46
to operand 87L DIFF RECVD DTT A.
to operand 87L DIFF RECVD DTT B.
to operand 87L DIFF RECVD DTT C.
ACTUAL VALUES / STATUS / CONTACT OUTPUTS / CONT OP N1
ACTUAL VALUES / STATUS / CONTACT OUTPUTS / CONT OP N1
SETTINGS / INPUTS/OUTPUTS / CONTACT INPUT N1
ACTUAL VALUES / STATUS / CONTACT OUTPUTS
SETTINGS / TESTING / FORCE CONTACT INPUTS / FORCE CONTACT INPUT N1
ACTUAL VALUES / STATUS / CONTACT OUTPUTS
menu where all current magnitudes and angles can be observed and con-
L90 Line Differential Relay
10 COMMISSIONING

10.9.4 LOCAL-REMOTE RELAY TESTS

OK
Enabled
is in the "Off" state.
is now in the "On" state.
Disabled"
to operand CURRENT DIFF KEY DTT.
that
CONTACT OUTPUT N1
that
CONTACT OUTPUT N1
GE Power Management
Enabled
,
and
are
N2
N3
to "Closed".
,
and
are
N2
N3
ACTUAL

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L90

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