9424200996 66-3
BE1-11m Phase Current Differential (87) Test
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 4 and reset all targets.
Step 8: Slowly decrease the A-phase current in CT circuit 1 or 2 until OUT2 closes and record the
pickup. This should occur at 0.30 A ±0.05 A. Verify that there is an 87A target on the front-panel
display.
Step 9: Slowly increase 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 10: To test the Restraint Slope 1 setting, connect two balanced three-phase current sources to the
BE1-11m in ABC rotation: 3.0∠0°, 3.0∠–120°, 3.0∠120° amps to terminals D1 through D6 and
3.0∠180°, 3.0∠60°, 3.0∠–60° amps to terminals F1 through F6 (1.5x tap).
Step 11: Slowly increase the A-phase current in CT circuit 1 or 2 until OUT2 closes and record the
pickup. This should occur at 3.75 A ±0.08 A. Verify that there is an 87A target on the front-panel
display.
Step 12: Reset to the current levels in step 10 and reset all targets.
Step 13: Slowly decrease the A-phase current in CT circuit 1 or 2 until OUT2 closes and record the
pickup. This should occur at 2.40 A ±0.05 A. Verify that there is an 87A target on the front-panel
display.
Step 14: To test the Restraint Slope 2 setting, connect two balanced three-phase current sources to the
BE1-11m in ABC rotation: 6.5∠0°, 6.5∠–120°, 6.5∠120° amps to terminals D1 through D6 and
6.5∠180°, 6.5∠60°, 6.5∠–60° amps to terminals F1 through F6 (3.25x tap).
Step 15: Slowly increase the A-phase current in CT circuit 1 or 2 until OUT2 closes and record the
pickup. This should occur at 8.83 A ±0.18 A. Verify that there is an 87A target on the front-panel
display.
Step 16: Reset to the current levels in step 14 and reset all targets.
Step 17: Slowly decrease the A-phase current in CT circuit 1 or 2 until OUT2 closes and record the
pickup. This should occur at 5.10 A ±0.10 A. Verify that there is an 87A target on the front-panel
display.
Step 18: (Optional.) Repeat steps 1 through 17 for the B-phase and C-phase current inputs.
Step 19: (Optional.) Repeat steps 1 through 18 for settings group 1, 2, and 3.
Pickup Verification (Average Restraint)
Step 1: Use BESTCOMSPlus to send the operational settings in Table 66-2. Reset all targets.
Table 66-2. Operational Settings (87R - Average)
System Parameters, Motor
Configuration
Sets the nominal secondary
sensing voltage to 69.3 V
System Parameters, Motor
Configuration
Sets the nominal secondary
sensing current to 5 amps
System Parameters, Motor
Configuration
Sets the nominal secondary
auxiliary voltage to 69.3 V
System Parameters, Sensing
Transformers
Sets the phase CT ratio to 1
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