U.6.27
Date Code 20090715 User’s Guide SEL-421 Relay
Testing and Troubleshooting
Checking Relay Operation
Figure 6.18 Negative-Sequence Instantaneous Overcurrent Element
Settings: ACSELERATOR QuickSet
Step 2. Upload the new setting to the SEL-421.
a. Click File > Send.
ACSELERATOR QuickSet prompts you for the settings
class you want to send to the relay, as shown in the
Group Select dialog box in Figure 6.19.
b. Click the check box for Group 1.
c. Click OK.
The relay responds with the Transfer Status dialog
box similar to Figure 6.19.
If you see no error message, the new settings are loaded
in the relay.
NOTE: The Relay Editor dialog boxes
shown in Figure 6.19 are for the
SEL-421. The SEL-421-1 SEL-421-2
dialog boxes do not contain
Automation 2 through Automation 10
setting instances.
Figure 6.19 Uploading Group 1 Settings to the SEL-421
Step 3. Display the 50Q1 Relay Word bit on the front-panel LCD
screen.
a. Access the front-panel LCD
MAIN MENU.
b. Highlight
RELAY ELEMENTS and press {ENT}.
c. Press {ENT} to go to the
ELEMENT SEARCH submenu of
Figure 6.20.
d. Use the navigation keys to highlight
5 and then press
{ENT} to enter characters in the text input field.
e. Enter the 0, Q, and 1 characters in turn.
f. Highlight
ACCEPT and press {ENT}.
The relay displays the screen containing the 50Q1
element, as shown in Figure 6.21.
Courtesy of NationalSwitchgear.com
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