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Clock Synchronization Tests - GE UR Series L90 Instruction Manual

Line current differential system.
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11.1 TESTING
17. Verify and record that Remote Loopback Test fails during communications failures as follows: start test as per Steps 13
11
to 14 and in 2 to 5 seconds disconnect the fiber Rx cable on the corresponding channel.
Expected result: The "Running Remote Loopback Test" message appears. When the channel is momentarily cut off,
18. Re-connect the fiber Rx cable. Repeat Steps 13 to 14 and verify that Remote Loopback Test performs properly again.
19. Verify and record that Remote Loopback Test fails if communications are not connected properly by disconnecting the
fiber Rx cable and repeating Steps 13 to 14.
Expected result: The
20. Repeat Steps 13 to 14 and verify that Remote Loopback Test is correct.
21. Make the following setting change in both relays:
During channel tests, verify in the
display that the values are very low – even 0. If values are comparatively high, settings of communica-
ETS
tions equipment (if applicable) should be checked.
NOTE
The 87L clock synchronization is based upon a peer-to-peer architecture in which all relays are Masters. The relays are
synchronized in a distributed fashion. The clocks are phase synchronized to each other and frequency synchronized to the
power system frequency. The performance requirement for the clock synchronization is a maximum error of ±130 s.
All tests are verified by using PFLL status displays. All PFLL status displays must be either OK or Fail.
1.
Ensure that Steps 1 through 7 inclusive of the previous section are completed.
2.
Verify and record that both relays have established communications with the following checks after 60 to 120 seconds:
ACTUAL VALUES
ACTUAL VALUES
ACTUAL VALUES
3.
Disconnect the fiber Channel 1(2) Tx cable for less than 66 ms (not possible with direct fiber module).
Expected result:
If fault conditions are applied to the relay during these tests, it trips with a specified 87L operation time.
4.
Disconnect the fiber Channel 1(2) Tx cable for more than 66 ms but less than 5 seconds.
Expected result:
If fault conditions are applied to the relay (after the channel is brought back) during these tests, it trips with a specified
87L operation time plus 50 to 80 ms required for establishing PFLL after such interruption.
5.
Disconnect the fiber Channel 1(2) Tx cable for more than 5 seconds.
Expected result:
6.
Reconnect the fiber Channel 1(2) Tx cable and in 6 to 8 seconds confirm that the relays have re-established communi-
cations again with the following status checks:
ACTUAL VALUES
ACTUAL VALUES
ACTUAL VALUES
11-2
the "Remote Loopback Test FAILED" message is displayed. The status check should read as fol-
lows:
ACTUAL VALUES
STATUS

ACTUAL VALUES
STATUS
"Fail" message should be constantly on the display.
ACTUAL VALUES

STATUS
CHANNEL TESTS

STATUS
CHANNEL TESTS

STATUS
CHANNEL TESTS
ACTUAL VALUES
STATUS
ACTUAL VALUES
STATUS
ACTUAL VALUES
STATUS
ACTUAL VALUES
STATUS
ACTUAL VALUES
STATUS
ACTUAL VALUES
STATUS
ACTUAL VALUES
STATUS
ACTUAL VALUES
STATUS
ACTUAL VALUES
STATUS

STATUS
CHANNEL TESTS

STATUS
CHANNEL TESTS

STATUS
CHANNEL TESTS
L90 Line Current Differential System
CHANNEL TESTS
CHANNEL 1(2) LOCAL LOOPBACK STATUS:


CHANNEL TESTS
: "Disabled"
TESTING
TEST MODE


STATUS
CHANNEL TESTS

11.1.2 CLOCK SYNCHRONIZATION TESTS


"OK"
CHANNEL 1(2) STATUS:

REMOTE LOOPBACK STATUS:
"OK"

PFLL STATUS:


CHANNEL TESTS
CHANNEL 1(2) STATUS:


CHANNEL TESTS
REMOTE LOOPBACK STATUS:


CHANNEL TESTS
PFLL STATUS:


CHANNEL TESTS
CHANNEL 1(2) STATUS:


CHANNEL TESTS
REMOTE LOOPBACK STATUS:


CHANNEL TESTS
PFLL STATUS:


CHANNEL TESTS
CHANNEL 1(2) STATUS:


CHANNEL TESTS
REMOTE LOOPBACK STATUS:


CHANNEL TESTS
PFLL STATUS:
"OK"
CHANNEL 1(2) STATUS:

REMOTE LOOPBACK STATUS:

"OK"
PFLL STATUS:
11 COMMISSIONING
CHANNEL 1(2) REMOTE LOOPBACK TEST:
CHANNEL 1(2) LOST PACK-
"n/a"
"OK"
"n/a"
"OK"
"OK"
"n/a"
"OK"
"OK"
"n/a"
"Fail"
"n/a"
"Fail"
GE Multilin

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