Sel SEL-421 - Figure 6.27 Uploading Group 1 and; Table 6.8 Negative-Sequence Directional Element Settings AUTO Calculations

U.6.31
Date Code 20020501 User’s Guide SEL-421/SEL-421-1 Relay
Testing and Troubleshooting
Checking Relay Operation
Figure 6.26 Directional Settings: ACSELERATOR Software.
Step 3. Upload the new settings to the SEL-421 Relay. On the File
menu, click Send. The
ACSELERATOR software prompts you
for the settings class you want to send to the relay, as shown in
the Group Select dialog box in Figure 6.27. Click the check
box for Group 1 and for Breaker Monitor. Click OK. The
ACSELERATOR software responds with a Transfer Status dialog
box as in Figure 6.27. If you see no error message, the new
settings are loaded in the relay.
NOTE: The Relay Editor dialog boxes
shown in Figure 6.27 are for the
SEL-421 Relay. The SEL-421-1 Relay
dialog boxes are similar.
Figure 6.27 Uploading Group 1 and
Breaker Monitor Settings to the SEL-421 Relay.
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