9424200994 Rev N 483
Second-Harmonic Restraint Verification (Shared)
Step 1: Use BESTCOMSPlus to send the operational settings in Table 220 and verify the logic in
Figure 307. Reset all targets.
Step 2: Connect in parallel a balanced, three-phase current source of 50 or 60-hertz and a second
three-phase current source of twice the applied fundamental (100 or 120-hertz) to terminals D1
through D6.
Step3: Apply 2 amps at 0° of the 50 or 60-hertz source. OUT2 should close immediately and OUT1
after the programmed time delay of 100 ms. Verify that there is an 87A, 87B, and 87C target on
the front-panel display.
Step 4: Increase the second-harmonic current source until OUT1 opens and record the magnitude of
the second-harmonic source.
Step 5: To calculate the second-harmonic restraint percentage, divide the second-harmonic current
measured in step 4 by the current applied in step 3 and multiply the result by 3. This should be
12% or 3 x (0.08 A each phase) ±0.05 A.
Step 6: (Optional.) Repeat steps 1 through 5 for settings group 1, 2, and 3.
Fifth-Harmonic Restraint Verification (Independent)
Step 1: Use BESTCOMSPlus to send the operational settings in Table 219 and verify the logic in
Figure 307. Reset all targets.
Step 2: Connect in parallel an A-phase current source of 50 or 60-hertz and a second A-phase current
source of five times the applied fundamental (250 or 300-hertz) to terminals D1 (A-phase
polarity) and D2 (A-phase non-polarity).
Step3: Apply 2 amps at 0° of the 50 or 60-hertz source. OUT2 should close immediately and OUT1
after the programmed time delay of 100 ms. Verify that there is an 87A target on the front-panel
display.
Step 4: Increase the fifth-harmonic current source until OUT1 opens and record the magnitude of the
fifth-harmonic source.
Step 5: To calculate the fifth-harmonic restraint percentage, divide the fifth-harmonic current measured
in step 4 by the current applied in step 3. (Divide the harmonic current by the fundamental
current.). This should be 35% or 0.70 A ±0.05 A.
Step 6: (Optional.) Repeat steps 1 through 5 for the B-phase (terminals D3 and D4) and C-phase
(terminals D5 and D6) current inputs.
Step 7: (Optional.) Repeat steps 1 through 6 for settings group 1, 2, and 3.
Fifth-Harmonic Restraint Verification (Shared)
Step 1: Use BESTCOMSPlus to send the operational settings in Table 220 and verify the logic in
Figure 307. Reset all targets.
Step 2: Connect in parallel a balanced, three-phase current source of 50 or 60-hertz and a second
three-phase current source of five times the applied fundamental (250 or 300-hertz) to
terminals D1 through D6.
Step3: Apply 2 amps at 0° of the 50 or 60-hertz source. OUT2 should close immediately and OUT1
after the programmed time delay of 100 ms. Verify that there is an 87A, 87B, and 87C target on
the front-panel display.
Step 4: Increase the fifth-harmonic current source until OUT1 opens and record the magnitude of the
fifth-harmonic source.
Step 5: To calculate the fifth-harmonic restraint percentage, divide the fifth-harmonic current measured
in step 4 by the current applied in step 3 and multiply the result by 3. This should be 35% or 3 x
(0.233 A each phase) ±0.05 A.
Step 6: (Optional.) Repeat steps 1 through 5 for settings group 1, 2, and 3.
BE1-11g Phase Current Differential (87) Test
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