BE1-951
Testing and Maintenance
13-45
Step 7 Verify the pickup and dropout accuracy of the middle and upper pickup settings listed in table 13-
59. Verify the 59-3 Bus target on the HMI.
Step 8 (Optional) Repeat Steps 2 through 7 for setting groups 1, 2, and 3.
Auxiliary Undervoltage and Overvoltage Timing Verification (3rd harmonic Vx input)
Step 1 Using Table 13-63 as a guide (same values as the fundamental test but at 3rd harmonic
frequency), transmit the first row of setting commands to the relay.
Table 13-63. 27X, 59X/159X Pickup and Time Delay Settings
Pickup and Time Delay Settings
Purpose
Undervoltage
Overvoltage
S0-27X=50,2s
S0-59X/159X=1
10,2s
Sets 27X PU at 50 V, 59X/159X at 110
V
Sets 27X TD, 59X/159X TD at 2
seconds
S0-27X=,5s
S0-59X/159X=,
5s
Sets 27X TD, 59X/159X TD at 5
seconds
S0-27X=,10s
S0-59X/159X=,
10s
Sets 27X TD, 59X/159X TD at 10
seconds
Step 2 Prepare to monitor the 27X and 59X/159X timings. Timing accuracy is verified by measuring the
elapsed time between a sensing voltage change and OUT1 closing.
Step 3
Connect and apply a single-phase, 80 Vac, 3rd harmonic voltage source to terminals C17 (polarity)
and C18 (non-polarity). Refer to Figure 13-1 for terminal locations
Step 4
Step the voltage down to 45 volts. Measure the time delay and verify the accuracy of the 27X time
delay setting. Timing accuracy is +5 percent or +3 cycles of the time delay setting.
Step 5 Step the voltage up to 115 volts. Measure the time delay and verify the accuracy of the 59X/159X
time delay setting. Timing accuracy is +5 percent or +3 cycles of the time delay setting.
Step 6 Repeat Steps 5 and 6 for the middle and upper time delay settings of Table 13-60.
Step 7 (Optional) Repeat Steps 2 through 6 for setting groups 1, 2, and 3.
Frequency
Purpose: To verify the operating accuracy of the 81/181/281/381/481/581 protection elements.
Reference Commands: SL-x81, SL-VO
Pickup Verification
Step 1 Prepare the x81 pickup functions for pickup testing by transmitting the commands in Table 13-64
to the relay.
Table 13-64. x81 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
SL-N=FREQTEST
Sets FREQTEST as custom logic name
SL-81=1,0
Enables 81, disables blocking
SL-181=1,0
Enables 181, disables blocking
