10.13
Date Code 20170814
Instruction Manual
SEL-700G Relay
Testing and Troubleshooting
Self-Test
Self-Test
The SEL-700G runs a variety of self-tests. The relay takes the following
corrective actions for out-of-tolerance conditions (see Table 10.9):
➤
Protection Disabled: The relay disables protection and control
elements and trip/close logic. All output contacts are de-
energized. The ENABLED front-panel LED is extinguished.
➤
ALARM Output: Two Relay Word bits, HALARM and
SALARM, signal self-test problems. SALARM is pulsed for
software programmed conditions, such as settings changes,
access level changes, three consecutive unsuccessful password
entry attempts, active group change, copy command, and
password change. HALARM is pulsed for hardware self-test
warnings. HALARM is continuously asserted (set to logical 1)
for hardware self-test failures. You can configure a diagnostic
alarm as explained in Section 4: Protection and Logic
Functions. In the Alarm Status column of Table 10.9, Latched
indicates that HALARM is continuously asserted, Not Latched
indicates that HALARM is pulsed for five seconds, and NA
indicates that HALARM is not asserted.
➤
The relay generates automatic STATUS reports at the serial
port for warnings and failures (ports with setting AUTO = Y).
➤
The relay displays failure messages on the relay LCD display
for failures.
➤
For certain failures, the relay will automatically restart as many
as three times. In many instances, this will correct the failure.
The failure message might not be fully displayed before
automatic restart occurs. Indication that the relay restarted will
be recorded in the Sequential Events Recorder (SER).
Use the serial port STATUS command or front-panel to view relay self-test
status. Based on the self-test type, issue the STA C command as directed in
the Corrective Actions column. Contact SEL if this does not correct the problem.
Table 10.9
Relay Self-Tests
(Sheet 1 of 4)
Self-Test
Description
Normal
Range
Protection
Disabled
on Failure
Alarm
Status
Auto
Message
on Failure
Front Panel
Message
on Failure
Corrective
Action
Watchdog Timer Periodic resetting
(1/32 cycle)
Yes
De-
energized
No
No
Mainboard FPGA (power up)
Fail if mainboard Field Programmable Gate
Array does not accept program or the version
number is incorrect
Yes
Latched
Yes
Status Fail
FPGA Failure
Automatic restart
a
Mainboard FPGA (run time)
Fail on lack of data acquisition interrupts or on
detection of a CRC error in the FPGA code
Yes
Latched
Yes
Status Fail
FPGA Failure
Automatic restart
GPSB (back-plane) communications
Fail if GPSB is busy on entry to processing
interval
Yes
Latched
Yes
Status Fail
GPSB Failure
STA C, to clear
the warning in the
status report.
Contact SEL if
failure returns.
Summary of Contents for SEL-700G Series
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