13-28
Testing and Maintenance
BE1-951
Step 7 (Optional) Repeat Steps 1 through 4 and Step 6, IG input, for the 151N element. Overwrite the 51
commands entered in Step 2 with the commands of Table 13-30.
Table 13-30. 151N Pickup Commands
Command
Purpose
A=
Gain write access
SL-151N=G,0
Enables 151N, disables blocking
SL-VO2=151NT
Enables OUT2 to close for 151N trip
SG-TRIGGER=151NT,151NPU,0
Enable 151NT or 151NPU to log and trigger fault recording
EXIT;Y
Exit and save settings
Step 8 (Optional) Repeat Steps 1 through 7 for the 51P, 51N, and 151N elements in setting groups 1, 2,
and 3. Before testing settings in other setting groups, a setting group must be selected using the
CS/CO-GROUP commands. To activate setting group 1, CS-GROUP=1 would be entered to select
setting group 1 and CO-GROUP=1 would be entered to make setting group 1 active.
Also, the pickup settings made in Step 3 (Table 13-27) must be changed to specify the setting
group being tested. To test settings in group 1, replace the 0 in the S0-x51 commands with a 1
(S1-x51).
Voltage Restraint/Control Time Overcurrent Protection
Purpose: To verify the operating accuracy of the 27R (Restraint and Control) for the phase time overcurrent
function.
S<g>-27R, SL-51, RG-STAT
51/27R-Voltage
Reference Commands: "Control" Pickup and Dropout Verification
Step 1 To prepare the 51Pelement for testing, transmit the commands in Table 13-31 to the relay. Reset
targets.
Table 13-31. 51P 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=51/27R/C
Sets custom logic name
SG-
VTP=1,4W,PN,PN
Set VT phase voltage parameters
SL-51P=1,0
Enables 51P and disables blocking
SL-VO1=51PT
Enables OUT1 to close for 51PT trip
SG-CT=1
Sets P, N CT ratio at 1:1
EXIT;Y
Exit and save settings
Step 2 Using Table 13-32 as a guide, transmit the 51/27R setting commands to the relay.
