U.6.15
Date Code 20020501 User’s Guide SEL-421/SEL-421-1 Relay
Testing and Troubleshooting
Test Methods
=>TAR 50P1<Enter>
50P1 50P2 50P3 50P4 67P1 67P2 67P3 67P4
0 0 0 0 0 0 0 0
=>
Figure 6.7 Sample Targets Display on a Serial Terminal.
Step 4. View the element status change. Type TAR 50P1
1000<Enter> (this command causes the relay to repeat the
TAR 50P1 command 1000 times). Increase the current source
to produce a current magnitude greater than 10.00 A secondary
in the relay. You will see the 50P1 element status change to 1
when the input current exceeds the 50P1P setting threshold.
Type <Ctrl+X> to stop the relay from presenting the target
display before completion of the 1000 target repeats.
View Relay Elements With the Front-Panel LCD
You can use the front-panel display and navigation pushbuttons to check
Relay Word bit elements. See Section 5: Front-Panel Operations in the User’s
Guide for more information on using the relay front panel.
This procedure uses the 50P1 Phase Instantaneous Overcurrent element. Use
the factory defaults for the pickup level (Table 6.6 on page 6.14). For more
information on the 50P elements, see Instantaneous Line Overcurrent
Elements on page R.1.62 in the Reference Manual.
Step 1. Display the MAIN MENU. If the relay LCD is in the Rotating
Display, press the {ENT} pushbutton to display the MAIN
MENU similar to that in Figure 6.8 on page 6.16.
Step 2. Prepare to view the elements on the front-panel LCD. Press the
{Down} arrow navigation pushbutton to highlight the RELAY
ELEMENTS action item (see the first screen of Figure 6.8).
Press the {ENT} pushbutton. You will see a RELAY
ELEMENTS screen (the second screen of Figure 6.8).
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