BE1-951
Testing and Maintenance
13-33
Step 21 With the same voltage still applied, increase the A-phase current until OUT2 closes. Swing the
angle of the applied c90 degrees and -90 degrees away from the 80-degree positive
sequence line angle. Verify that OUT2 opens at approximately 170 degrees I lag E and 350
degrees I lag E. OUT2 should remain closed from 170 through 80 to 350 degrees I lag E (defined
as forward trip direction)
Step 22 Transmit S0-67=V,V0IG. This sets the operate quantity to IG (independent ground input). Repeat
Steps 19 through 21 with polarity current connected to terminal D7, and non-polarity current to D8.
Step 23 Transmit S0-67=V,VXIG. This sets the reference quantity to VX input and operate quantity to 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 0 degrees I lage E. Repeat
Steps 20 and 21 with polarity current connected to terminal D7, and non-polarity current to D8 (IG
input).
Step 24 Transmit S0-67=V,VXIN. This sets the reference quantity to VX input, and operate quantity to
calculated IN. 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 0 degrees I lag E. Repeat Steps 20 and 21
with polarity of A phase current connected to terminal D1 and non-polarity current to D2.
Step 25 Repeat Steps 3 through 24 for “Reverse Polarization”. Relay operation will occur 180 degrees
away from the Positive and Negative Sequence line angle (both at 80 degrees or 260 degrees I
lag E in our example). Verify that the output contacts remain closed from 170 through 260 to 350
degrees I lag E.
Step 26 (Optional) Repeat Steps 3 through 25 for 150TNQ, 51TNQ, and 151N. Setup commands and
associated operational setting Tables must me modified accordingly, i.e. all “50” entries would
change to “150” and so on.
Step 27 (Optional) Repeat Steps 3 through 25 for setting groups 1, 2, and 3.
Zero sequence Current Polarizing, Ground Over current Elements
Step 1
Use setup commands in Table 13-34. Using Table 13-39 as a guide, transmit the 67 setting
commands to the relay.
Table 13-39. 67N (Io pol)-50TN Operational Settings
Operating Settings
Purpose
S0-67=I
Sets 67N to Zero Sequence Current Polarizing
S0-50TP=0,0,F
Sets 50TP at 0 amps, 0 time delay, Forward Tripping Direction
S0-50TN=2.0,0,F
Sets 50TN at 2.0 amps, 0 time delay, Forward Tripping Direction
S0-50TQ=0,0,F
Sets 50TN at 0 amps, 0 time delay, Forward Tripping Direction
Step 2
Apply 2 amps ac 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 3
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 2 percent of the 50TN pickup setting. Dropout will occur at 93 to 97% of
actual pickup. Verify the 67N target on the HMI.
Step 4
With the same polarizing current applied, increase the A-phase current until OUT2 closes. Swing
the angle of the applied c90 degrees and -90 degrees away from the 0. Verify that OUT2
opens at approximately 90 degrees I lag E and 270 degrees I lag E. OUT2 should remain closed
from 90 through 0 to 270 degrees I lag E (defined as forward trip direction)
Step 5
Repeat Steps 1 through 4 for "Reverse Polarization by transmitting the “R” command in the
operational setting, ie. S0-50TP=2.5,0,R". Relay operation will occur at 180 degrees I lag E.
Swing the angle of the applied c90 degrees and -90 degrees away from 180 degrees.
Verify that OUT2 opens at approximately 90 degrees I lag E and 270 degrees I lag E. OUT2
should remain closed from 90 through 180 to 270 degrees I lag E (defined as reverse trip
direction)
