9328900990 Rev L BE1-951 Testing and Maintenance 13-45
Step 5: Slowly decrease the frequency of the applied voltage until OUT3 (281) closes. Pickup should
occur within ±0.01 hertz of the pickup setting. Slowly increase the frequency until OUT3 opens.
Dropout should occur at 0.02 hertz above or below the pickup setting.
Step 6: Repeat Step 5 for the 181 (OUT2) and 81 (OUT1) functions.
Step 7: Repeat Step 4.
Step 8: Slowly increase the frequency of the applied voltage until OUT4 (381) closes. Pickup should
occur within ±0.01 hertz of the pickup setting. Slowly decrease the frequency until OUT4 opens.
Dropout should occur at 0.02 hertz above or below the pickup setting.
Step 9: Repeat Step 5 for the 481 (OUT5) and 581 (OUT1) functions.
Step 10: Connect and apply 120 Vac, 60 Hz voltage source to Vx input C17 and C18.
Step 11: Repeat Steps 5 through 9.
Step 12: (Optional.) Repeat Steps 1 through 11 for Setting Groups 1, 2, and 3.
Time Delay Verification
Step 1: Prepare the x81 functions for time delay testing by transmitting the commands in the first
column (2 second TD) of
Table 13-66 to the relay. Commands entered in Tables 13-64 and 13-
65 should be retained for this test.
Table 13-66. x81 Time Delay Settings
Pickup and Time Delay Settings
2 Second TD 5 Second TD 10 Second TD
Purpose
S0-81=,2S S0-81=,5S S0-81=,10S Sets 81 TD.
S0-181=,2S S0-181=,5S S0-181=,10S Sets 181 TD.
S0-281=,2S S0-281=,5S S0-281=,10S Sets 281 TD.
S0-381=,2S S0-381=,5S S0-381=,10S Sets 381 TD.
S0-481=,2S S0-481=,5S S0-481=,10S Sets 481 TD.
S0-581=,2S S0-581=,5S S0-581=,10S Sets 581 TD.
Step 2: Prepare to monitor the x81 timings. Timing accuracy is verified by measuring the elapsed time
between a frequency change and programmed output closing.
Step 3: Connect and apply a 120 Vac, 60 hertz voltage source to Terminals C13 (A-phase) and C16
(Neutral).
Step 4: Step the frequency of the applied voltage down from 60 hertz to a value below the 281
underfrequency setting. Measure the time delay and verify the accuracy of the 281 time delay
setting. Timing accuracy is ±5 percent or ±3 cycles of the time delay setting.
Step 5: Repeat Step 4 for the 181 (OUT2) and 81 (OUT1) elements.
Step 6: Step the frequency of the applied voltage up from 60 hertz to a value above the 381
overfrequency setting. Measure the time delay and verify the accuracy of the 281 time delay
setting. Timing accuracy is ±0.5% or 1 cycle (minimum trip is affected by 3 cycle security count).
Step 7: Repeat Step 6 for the 481 (OUT5) and 581 (OUT1) elements.
Step 8: Transmit the commands in the second column (5 Second TD) of
Table 13-66 to the relay.
Step 9: Repeat Steps 2 through 7 with a time delay setting of 5 seconds.
Step 10: Transmit the commands in the third column (10 Second TD) of
Table 13-66 to the relay.
Step 11: Repeat Steps 2 through 7 with a time delay setting of 10 seconds.
Step 12: Repeat Steps 4 through 11 for Vx inputs C17 and C18.
Step 13: (Optional.) Repeat Steps 1 through 11 for Setting Groups 1, 2, and 3.
To Next Page
Loading...
Need help?
General