GE UR Series Instruction Manual

Also see for L90: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

10-44L90 Line Differential RelayGE Power Management10.9 L90 COMMISSIONING TESTS 10 COMMISSIONING1016. Verify and record the Remote Loopback Test was performed properly with the following status check:ACTUAL VALUES ÖØ STATUS ÖØ CHANNEL TESTS ÖØ CHANNEL 1(2) REMOTE LOOPBACK STATUS: "OK"17. Verify and record that Remote Loopback Test fails during communications failures as follows: start test as per Steps 13to 14 and in 10 to 30 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,the "Remote Loopback Test FAILED" message is displayed. The status check should read as fol-lows: ACTUAL VALUES Ø STATUS Ø CHANNEL TESTS Ö CHANNEL 1(2) LOCAL LOOPBACK STATUS: "Fail"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 thefiber Rx cable and repeating Steps 13 to 14.Expected result: The ACTUAL VALUES ÖØ STATUS ÖØ CHANNEL TESTS ÖØ CHANNEL 1(2) REMOTE LOOPBACK TEST:"Fail" message should be constantly on the display.20. Repeat Steps 13 to 14 and verify that Remote Loopback Test is correct.21. Make the following setting change in both relays: TESTING Ö TEST MODE: "Disabled"During channel tests, verify in the ACTUAL VALUES ÖØ STATUS ÖØ CHANNEL TESTS Ö CHANNEL 1(2) LOST PACK-ETS display that the values are very low – even 0. If values are comparatively high, settings of communica-tions equipment (if applicable) should be checked.10.9.2 CLOCK SYNCHRONIZATION TESTSThe 87L clock synchronization is based upon a peer-to-peer architecture in which all relays are Masters. The relays aresynchronized in a distributed fashion. The clocks are phase synchronized to each other and frequency synchronized to thepower system frequency. The performance requirement for the clock synchronization is a maximum error of ±130 μs.All tests are verified by using PFLL STATUS displays. All PFLL STATUS displays must be either OK or Fail.TEST PROCEDURE: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 / STATUS / CHANNEL TESTS / CHANNEL 1(2) STATUS: "OK"ACTUAL VALUES / STATUS / CHANNEL TESTS / REMOTE LOOPBACK STATUS: "n/a"ACTUAL VALUES / STATUS / CHANNEL TESTS / PFLL STATUS: "OK"3. Disconnect the fiber Channel 1(2) Tx cable for less than 66 ms.Expected result: ACTUAL VALUES / STATUS / CHANNEL TESTS / CHANNEL 1(2) STATUS: "OK"ACTUAL VALUES / STATUS / CHANNEL TESTS / REMOTE LOOPBACK STATUS: "n/a"ACTUAL VALUES / STATUS / CHANNEL TESTS / PFLL STATUS: "OK"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: ACTUAL VALUES / STATUS / CHANNEL TESTS / CHANNEL 1(2) STATUS: "OK"ACTUAL VALUES / STATUS / CHANNEL TESTS / REMOTE LOOPBACK STATUS: "n/a"ACTUAL VALUES / STATUS / CHANNEL TESTS / PFLL STATUS: "OK"If fault conditions are applied to the relay (after the channel is brought back) during these tests, it trips with a specified87L 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: ACTUAL VALUES / STATUS / CHANNEL TESTS / CHANNEL 1(2) STATUS: "OK"ACTUAL VALUES / STATUS / CHANNEL TESTS / REMOTE LOOPBACK STATUS: "n/a"ACTUAL VALUES / STATUS / CHANNEL TESTS / PFLL STATUS: "Fail"6. Reconnect the fiber Channel 1(2) Tx cable and in 60 to 120 seconds confirm that the relays have re-established com-munications again with the following status checks:NOTE