Sel 411L - Page 746

P.11.32
SEL-411L Relay Protection Manual Date Code 20151029
Testing and Troubleshooting
Checking Relay Operation
Checking the Negative-Sequence Directional Element (Phase Faults)
This test confirms operation of the F32Q and the R32Q negative-sequence
directional elements. This test procedure is for a 5 A relay; scale values
appropriately for a 1 A relay.
This example assumes that you have successfully established communication
with the relay. In addition, you must be familiar with relay access levels and
passwords.
Step 1. Configure the relay.
a. Open
ACSELERATOR QuickSet and read the present
configuration in the relay.
b. Click Settings > Read.
The relay sends all settings and configuration data to
ACSELERATOR QuickSet.
c. Expand the Group 1 settings and click the Relay
Configuration branch of the Settings tree view.
d. Disable supervisory elements.
Confirm that ELOP is set to N.
e. In a similar sequence, click on the + button to expand
the Relay Configuration tree view, click on Load
Encroachment, and confirm that ELOAD is set to N.
f. Defeat the pole-open logic.
g. Click the + button next to Breaker Monitor to expand
the Breaker Monitor branch of the Settings tree view.
h. Click Breaker 1.
i. Enter 1 in the text boxes for 52AA1 A-phase N/O
Contact Input -BK1, 52AB1 B-Phase N/O Contact
Input -BK1, and 52AC1 C-phase N/O Contact
Input -BK1.
The text boxes appear if Breaker Monitor setting
BK1TYP := 1.
j. If BK1TYP := 3, enter 1 in the 52AA1 N/O Contact
Input -BK1 text box (the other circuit breaker input
boxes are dimmed.)
Step 2. Set test values in the relay.
a. Expand the Group 1 settings and select the Line
Configuration button.
b. Confirm the default settings of Z1MAG at 7.80 and
Z1ANG at 84.00.
c. Click the + mark next to the Relay Configuration
branch to expand that Settings branch.
d. Select the Directional button.
e. Confirm the following settings: E32 is AUTO,
ORDER is Q, 50FP is 0.60, 50RP is 0.4
0, Z2F is 3.90,
Z2R is 4.00, a2 is 0.10, and k2 is 0.2.
The dialog box is dim since there are no settings to
change.
The relay calculates these numeric settings
automatically because E32 is set to AUTO.
NOTE: As you perform this test,
other protection elements can assert.
This causes the relay to assert other
targets and possibly close control
outputs. Be sure to isolate the relay
from the power system to avoid
unexpected system effects.