U.6.31
Date Code 20090715 User’s Guide SEL-421 Relay
Testing and Troubleshooting
Checking Relay Operation
Figure 6.23 Breaker 1 Breaker Monitor Settings: ACSELERATOR QuickSet
Step 2. Set test values in the relay.
a. Expand the Group 1 settings as shown in Figure 6.24
and select the Line Configuration button.
You will see the Line Configuration dialog box of
Figure 6.24.
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.
You will see the Directional dialog box similar to
Figure 6.25.
e. Confirm the following settings: E32 is AUTO,
ORDER is Q, 50FP is 0.60, 50RP is 0.40, 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.
f. If you need to change these settings, set E32 to Y.
Table 6.8 shows the calculations.
See Ground Directional Element on page R.1.27 for
details on these relay calculations.
Courtesy of NationalSwitchgear.com
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