13-22
Testing and Maintenance
BE1-951
50/150TQ Time Delay Verification
Step 1 Connect a current source to terminals D1 and D2 (A-phase).
Step 2 Prepare the 50TQ and 150TQ elements for testing by transmitting the commands in Table 13-17
to the relay.
Table 13-17. 50TQ Pickup Commands
Command
Purpose
A=
Gain write access
SL-N=NONE
Zero out custom settings. Overwrite with
logic=none settings.
Y
Confirm overwrite
SL-N=50/150
Sets Q50 as custom logic name
SL-50TQ=1,0
Enables 50TQ, disables blocking
SL-150TQ=1,0
Enables 150TQ, disables blocking
SL-VO1=50TQT
Enables OUT1 to close for 50TQ trip
SL-VO2=150TQT
Enables OUT2 to close for 150TQ trip
SG-CT=1
Sets CT ratio at 1
SG-TRIGGER=50TQT,50T
QPU, 150TQT,150TQPU 0
Enable 50/150TQT to log and trigger fault
recording
EXITY;Y
Exit and save settings
Step 3 Using Table 13-18, transmit the first column of setting commands for your sensing input type
(substitute 0.1 for 1 amp CT).
Table 13-18. 50/150TQ Time Delay Settings
Pickup and Time Delay Settings
Purpose
2 Second TD
5 Second TD
10 Second TD
S0-50TQ=0.5,2S,
S0-50TQ=0.5,5S
S0-50TQ=0.5,10S
Sets 50TQ TD
For a single-phase input test, I
2
= Ia ÷ 3. Therefore, the relay should pick up at a value of three times the
setting value when applying only a single-phase input. For example, to determine the pickup current value
required for a 1A relay with a pickup setting of 0.1, it would require 0.1 times 3 or 0.3 amperes of input
current.
Step 4 Step the applied A-phase current to 110% of pickup. Measure the time delay and verify the accuracy
of the 50TQ time delay setting, OUT1, and 150TQ, 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 13-18.
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 setting groups 1, 2, and 3.
50/150TN (Independent Ground Input IG) Pickup and Dropout Verification
Purpose: To verify the operation of the 50TN and 150TN elements for IG input.
Reference Commands: SL-50TN/150TN
Step 1 Connect a current source to terminals D7 and D8 (IG).
