BE1-951
Testing and Maintenance
13-19
Step 9 (Optional) Repeat Steps 1 through 8 for the 50T and 150T 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 13-7) must be changed to specify the setting group
being tested. To test settings in group 1, replace the 0 in the S0-x50 commands with a 1 (S1-x50).
50/150TP and TN (Calculated 3Io) Time Delay Verification
Step 1 Connect a current source to terminals D1 and D2 (A-phase). Refer to Figure 13-1 for terminal
locations.
Step 2 Prepare the 50T/150T elements for testing by transmitting the commands in Table 13-10 to the
relay.
Table 13-10. 50T Time Delay 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=TD50
Sets TD50 as custom logic name
SL-50T=1,0
Enables 50TP, 50TN (3Io), and 50TQ and
disables blocking
SL-VO1=50TPT
Enables OUT1 to close for 50TP trip
SL-VO2=50TNT
Enables OUT2 to close for 50TN trip
SG-CT=1
Sets P, N ct ratio at 1:1
SG-TRIG=50TPT+50TNT,50TNPU,0
Enable 50TPT or 50TNT to log and trigger fault
recording
EXITY;Y
Exit and save settings
Step 3 Using Table 13-11, transmit the first column of setting commands.
Table 13-11. 50/150T Time Delay Settings
Pickup and Time Delay Settings
Purpose
2 Second TD
5 Second TD
10 Second TD
S0-50TP=0.5,2S,
S0-50TP=0.5,5S
S0-50TP=0.5,10S
Sets 50TP TD
S0-50TN=0.5,2S
S0-50TN=0.5,5S
S0-50TN=0.5,10S
Sets 50TN TD
Step 4 Step the applied A-phase current to .55 amps (for 1 amp CT circuit divide by 5). Measure the time
delay and verify the accuracy of the 50TP time delay setting, OUT1, and 50TN, OUT2. Timing
accuracy is +5 percent or +3 cycles of the time delay setting.
Step 5 Repeat Step 2 and 3 for the middle and higher time delay settings in table 13-11.
Step 6 (Optional) Repeat Steps 3 through 5 for phase B (terminals D3 and D4), phase C (terminals D5 and
D6).
Step 7 (Optional) Repeat Steps 1 through 6 for the 150T elements. Overwrite the 50T commands entered
in Step 2 with the commands of Table 13-12.
