Basler BE1-11g, Instruction Manual

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9424200994 Rev U 491
BE1-11 g Directional Overcurrent (67) Test
panel display. Note that 50-2 can also be set to operate for calculated IN (3I0) while still being
polarized by VXIG. Verify operation by repeating steps 25 and 26 with 50-2 set for 3I0 operate.
Verify that there is a 50-2-67-Residual target on the front-panel display.
Step 29: Set Zero Sequence Mode to VXIN on the Protection, Current, Directional (67-1) screen. The
polarizing reference quantities are an external source of 3V0 applied at the VX input compared
to the calculated IN (3I0) quantity. Apply polarity of a single-phase voltage source (30 Vac at
nominal frequency) to terminal C17 and non-polarity to C18 at an angle of 180 degrees lagging.
An angle of 180 degrees is used to simulate a broken delta voltage where polarity to non-
polarity is 180 degrees out of phase with, for example, the A-phase current during an A-phase
to ground fault. The BE1-11
g
internally compensates for the 180-degree phase difference such
that polarity voltage from the broken delta source connected to polarity of the BE1-11 g results in
a 0-degree condition for a Forward fault. To verify, connect A-phase current in series with IG
current. That is, polarity current should go in D1 out D2 and in D7 out D8 if IG is available.
Repeat steps 25 and 26 with 50-2 set for 3I0 operate. Verify that there is a 50-2-67-Residual
target on the front-panel display. Note that 50-2 can also be set to operate for measured
independent ground (IG) while still being polarized by VXIN. Verify operation by repeating steps
25 and 26 with 50-2 set for 3I0 operate. Verify that there is a 50-2-67-Residual target on the
front-panel display.
Step 30: Repeat steps 4 through 29 for "Reverse Polarization." BE1-11 g operation will occur 180
degrees away from the Positive and Negative Sequence torque angle (both at 80 degrees or
260 degrees I lags E in our example). Verify that the output contacts remain closed from 170
through 260 to 350 degrees I lags E.
Step 31: (Optional.) Repeat steps 4 through 30 for 50-4, 50-5, and 50-6. Setup commands and
associated operational setting Tables must be modified accordingly.
Step 32: (Optional.) Repeat steps 4 through 31 for settings group 1, 2, and 3.
Step 33: (Optional.) Repeat steps 1 through 33 with CT Circuit 2 selected as the CT source for the
instantaneous overcurrent (50) and directional overcurrent (67) elements, and 67-2 as the
directional source, for protection systems equipped with two sets of CTs. In Step 1, D7 with F7,
D8 with F8.
Zero-Sequence Current Polarization
Use setup commands in Table 217. Using Table 223 as a guide, send the settings to the BE1-11
g
.
Table 223. Directional, Current-Polarizing, Neutral Operational Settings
Setting Value BESTCOMSPlus Screen Description
Polarization
Method IG=checked
Q=unchecked
V=unchecked Protection, Current, Directional
(67-1) Selects zero sequence
current polarization
Pickup 0 A Protection, Current, Instantaneous
Overcurrent (50-1) Sets 50-1 pickup to 0 amps
Pickup 2.0 A Protection, Current, Instantaneous
Overcurrent (50-2) Sets 50-2 pickup to 2.0
amps
Pickup 0 A Protection, Current, Instantaneous
Overcurrent (50-3) Sets 50-3 pickup to 0 amps
Step 1: Apply 2 Aac current at 0 degrees to the independent ground input IG, terminals D7 (polarity)
and D8 (non-polarity). No ac voltage is required for this test.
Step 2: From a second current source, apply 0 amp A-phase current at an angle of 0 degrees and
slowly increase the current until OUT2 closes. Decrease A-phase current until OUT2 just drops
out. Pickup will occur within
±
2% of the 50-2 pickup setting (1.96 A to 2.04 A). Dropout will
occur at approximately 95% of the actual pickup value. Verify that there is a 50-2-67-Residual
target on the front-panel display.