Basler Electric BE1-11t - Manual (Page 412)

400 9424200995 Rev H
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.
Step 26: With the same voltage still applied, increase the A-phase current until OUT2 closes. Swing the
angle of the applied current +90 degrees and –90 degrees away from the 80-degree zero-
sequence line angle. Verify that OUT2 opens at approximately 170 degrees lagging and 350
degrees lagging. OUT2 should remain closed from 170 through 80 to 350 degrees lagging
(defined as forward trip direction). Steps 23 through 26 verify polarizing reference quantities
V0IN, with 50-2 set to operate for calculated 3I0 as per Table 186. The 50-2 element can also
be set to operate for measured ground current IG while still being polarized by V0IN. To verify,
connect A-phase current in series with IG current. That is, polarity current should go in D1 out
D2, in D7 out D8. Repeat steps 24 through 26 with 50-2 mode set for IG operate and 50-2
target set for 50-2-67-IND GND. Verify that there is a 50-2-67-IND GND target on the front-
panel display.
Step 27: Set Zero Sequence Mode to VOIG on the Protection, Current, Polarization (67N) screen. The
polarizing reference quantities are V0 compared to IG measured. This compares calculated V0
to measured IG (independent ground input). Repeat steps 24 through 26 with A-phase current
connected in series with IG current. That is, polarity current should go in D1 out D2, in D7 out
D8.Verify that there is a 50-2-67-IND GND target on the front-panel display. Note that 50-2 can
also be set to operate for calculated IN (3I0) while still being polarized by V0IG. Verify operation
by repeating steps 24 through 26 with 50-2 set for 3I0 operate. Verify that there is a 50-2-67-
Residual target on the front-panel display.
Step 28: Set Zero Sequence Mode to VXIG on the Protection, Current, Polarization (67N) screen. Set
50-2 mode to IG on the Protection, Current, Instantaneous Overcurrent (50-2) screen. The
polarizing reference quantities are an external source of 3V0 applied at the VX input compared
to measured IG (independent ground input). 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 BE1-11t internally compensates for the 180 degree phase difference
such that polarity voltage from the broken delta source connected to polarity of the BE1-11t
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, in D7 out D8. Repeat steps 25
and 26 with 50-2 set for IG operate. Verify that there is a 50-2-67-IND GND target on the front-
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, Polarization (67N) 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 BE1-11t internally compensates for the 180 degree phase difference such
that polarity voltage from the broken delta source connected to polarity of the BE1-11t 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." BE1-11t 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.
Directional Overcurrent (67) Test BE1-11t