Sel 421 - Table 6.8 Negative-Sequence Directional Element Settings AUTO Calculations

U.6.32
SEL-421 Relay User’s Guide Date Code 20090715
Testing and Troubleshooting
Checking Relay Operation
Figure 6.24 Group 1 Line Configuration Settings: ACSELERATOR QuickSet
Figure 6.25 Directional Settings:
ACSELERATOR QuickSet
Table 6.8 Negative-Sequence Directional Element Settings AUTO
Calculations
Setting Calculation
50FP 0.12 • I
nom
50RP 0.08 • I
nom
Z2F 0.5 • Z1MAG
Z2R Z2F + 1 / (2 • I
nom
)
a2 0.1
k2 0.2
Courtesy of NationalSwitchgear.com