Basler Electric BE1-11t - Manual (Page 417)

9424200995 Rev H 405
Setting Value BESTCOMSPlus Screen Description
Mode Percent
Differential Protection, Current, Phase
Differential (87) Sets the type of operation
protection to traditional
phase current differential
Slope Mode Maximum Protection, Current, Phase
Differential (87) Sets the element to operate
using maximum restraint
current
Min. Rest. Pickup
(MOT) 0.10 Protection, Current, Phase
Differential (87) Sets the minimum amount
of operate current required
for a trip to 0.10x tap
Restraint Slope 1
(%) 20 Protection, Current, Phase
Differential (87) Sets the 1 st slope of the
restraint characteristic to
20%
2 nd Slope Pickup
(MOT)
3.00 Protection, Current, Phase
Differential (87) The 2 nd slope is active
when the measured
maximum restraint current
is greater 3x tap
Restraint Slope 2
(%) 40 Protection, Current, Phase
Differential (87) Sets the 2 nd slope of the
restraint characteristic to
40%
Time Delay (ms) 100 Protection, Current, Phase
Differential (87) Sets the trip time delay to
100 ms
(Optional)
Harmonics Mode Independent Protection, Current, Phase
Differential (87)
Sets the harmonic restraint
for independent phase
operation
(Optional) 2 nd
Harmonic (%)
12 Protection, Current, Phase,
Differential (87) Sets the second harmonic
restraint threshold to 12%
of the fundamental
(Optional) 5 th
Harmonic (%)
35 Protection , Current, Phase
Differential (87) Sets the fifth harmonic
restraint threshold to 35%
of the fundamental
Step 2: Use BESTCOMSPlus to configure the BESTlogicPlus programmable logic shown in Figure 265.
•
Blocking is disabled.
•
OUT1 closes for 87 Trip.
•
OUT2 closes for 87 Pickup.
•
Fault recording is enabled.
Step 3: Prepare to monitor the 87R function operation. Operation can be verified by monitoring OUT2
(see Figure 265).
Step 4: To test the Minimum Restrained Pickup setting, connect two balanced three-phase current
sources to the BE1-11t in ABC rotation: 0.5
∠0°, 0.5∠–120°, 0.5∠120° amps to terminals D1
through D6 and 0.5
∠180°, 0.5∠60°, 0.5∠–60° amps to terminals F1 through F6 (0.25x tap).
Step 5: Slowly increase the A-phase current in CT circuit 1 or 2 until OUT2 closes and record the
pickup. This should occur at 0.70 A
±0.05 A. Verify that there is an 87A target on the front-panel
display.
Step 6: Slowly decrease the A-phase current in CT circuit 1 or 2 until OUT2 reopens and record the
dropout. See the functional test report for acceptable ranges.
Step 7: Reset to the current levels in step 5 and reset all targets.
BE1-11t Phase Current Differential (87) Test