BE1-951
Testing and Maintenance
13-47
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 13-67 and 13-68 should
be retained for this test.
Table 13-66. x81 Time Delay Settings
Pickup and Time Delay Settings
Purpose
2 Second TD
5 Second TD
10 Second TD
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 +5 percent or +3 cycles of the time delay setting.
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 13-63 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 13-63 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.
Synchronism Check
Purpose: To verify the operation of the Synchro Check (25) function.
Reference Commands: SL-25, SL-V0.
25VM--VTP and VTX Live Voltage, Dead Voltage Pickup Test
Step 1
Prepare the 25-function block for testing by transmitting the commands in Table 13-67 to the relay.
Table 13-67. Synchro Check Pickup Test Commands
Command
Purpose
A=
Gain write access
SL-N=NONE
Zero out custom logic settings. Overwrite with
logic=none settings.
Y
Confirm overwrite
