U.4.12
SEL-421/SEL-421-1 Relay User’s Guide Date Code 20020501
Basic Relay Operations
Checking Relay Status
Checking Relay Status
With continual self-testing, the SEL-421 Relay monitors the internal operation
of all circuits to verify optimal performance of relay functions. If an internal
circuit, protection algorithm, or automation algorithm enters an out-of-
tolerance operating range, the relay reports a status warning. In the unlikely
event that an internal failure occurs, the relay reports a status failure. For more
information on relay status, see Relay Self-Tests on page U.6.37 in the User’s
Guide.
You can check relay status through a communications port by using a
terminal, terminal emulation computer program, or the
ACSELERATOR
software. In addition, you can use the relay front panel to view status
information.
Checking Relay
Status: Terminal
The procedure in the following steps assumes that you have successfully
established communication with the relay; see Making an EIA-232 Serial Port
Connection on page 4.6 for a step-by-step procedure. In addition, you must be
familiar with relay access levels and passwords. See Changing the Default
Passwords: Terminal on page 4.10 to change the default access level
passwords.
Step 1. Prepare to monitor the relay at Access Level 1. Using a
communications terminal, type ACC<Enter>. Type the Access
Level 1 password and press <Enter>. You will see the =>
action prompt.
Step 2. Type STA<Enter>. The relay returns a status terminal screen
similar to that in Figure 4.7.
=>STA<Enter>
Relay 1 Date: 03/15/2001 Time:07:02:50.776
Station A Serial Number: 000101234
FID=SEL-421-R101-V0-Z001001-D20010315 CID=0x9aed
Failures
No Failures
Warnings
No Warnings
SELogic Relay Programming Environment Errors
No Errors
Relay Enabled
=>
Figure 4.7 Relay Status.
To view all relay status entries, use the STA A command. For more
information on relay status report items, see STATUS on page R.8.45 in the
Reference Manual.
Checking Relay
Status:
ACSELERATOR
Software
You can use the SEL-5030 ACSELERATOR Software Program to check relay
status. Use the HMI > Meter Control menu to view status conditions.
The procedure in the following steps assumes that you have successfully
established communication with the relay; see Making an EIA-232 Serial Port
Connection on page 4.6 for a step-by-step procedure. In addition, you must be
familiar with relay access levels and passwords. See Changing the Default
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