10.16
SEL-400 Series Relays Instruction Manual Date Code 20171006
Testing, Troubleshooting, and Maintenance
Relay Self-Tests
tion-disabled state. During a protection-disabled state, the relay suspends protec-
tion element processing and trip logic processing and de-energizes all control
outputs. When disabled, the ENABLED front-panel LED is not illuminated.
The relay signals a status warning by pulsing the HALARMP, HALARMA, and
HALARM Relay Word bits (hardware alarm) to logical 1 for five seconds. For a
status failure, the relay latches the HALARML and HALARM Relay Word bits
at logical 1. Some hardware failures prevent the relay from operating. In such
cases, Relay Word bits HALARML and HALARM do not assert.
Once HALARMP pulses, Relay Word bit HALARMA continues to assert for
approximately five seconds once per minute to indicate that a hardware warning
has occurred. HALARMA continues to pulse until it is reset by pulsing SEL
OGIC
control equation RST_HAL. Restarting the relay also resets HALARMA.
HALARMP does not assert again for the same alarm condition, unless the condi-
tion is cleared and returns.
The relay will automatically restart as many as two times on certain diagnostic
failures. In many instances, this will correct the failure. When this occurs, the
relay will log a
Diagnostic Restart in the SER.
To provide remote status indication, connect the b contact of OUT108 to your
control system remote alarm input and program the output SEL
OGIC control
equation to respond to NOT (SALARM OR HALARM).
If you repeatedly receive status warnings, check relay operating conditions as
soon as possible. Take preventive action early during the development of poten-
tial problems to avoid system failures. For any status failure, contact your Techni-
cal Service Center or the SEL factory immediately (see Technical Support on
page 10.31).
The relay generates an automatic status report at the serial ports for a self-test sta-
tus failure if you set Port setting AUTO := Y. The relay issues a status message
with a format identical to the STATUS command output, but includes the power
supply information from the STA A response. The relay also displays status
warning and status failure automatic messages on the front-panel LCD. Use the
serial port STATUS and CSTATUS commands and the front-panel
RELAY STA-
TUS
menu to display status warnings and status failures. See STATUS on
page 14.50, Checking Relay Status on page 3.11, and Relay Status on page 4.29
for more information on automatic status notifications and on viewing relay status.
The relay includes self-diagnostics that monitor settings, hardware, and commu-
nication. The settings diagnostic checks if an internal error may have caused the
calibration settings to be lost or corrupted, which would introduce errors in the
magnitude and angles of the voltages and currents measured. The hardware diag-
nostics monitor any component change that does not match the part number, as
well as hardware failures in the power supply, processors, and digital samplers.
For relays that support remote data acquisition, such as TiDL, the relay will mon-
itor the connection to the remote data or the communication board in the relay
that receives the remote data. Finally, the diagnostics monitor communications
such as Ethernet, serial, and 87L connections. The STATUS command notifies
the user if any of the diagnostics trigger a warning or a failure. In cases where the
issue is a failure the relay will become disabled and protection will be inhibited.
Status
Figure 10.8 is a sample STATUS screen from the Status option of the QuickSet
HMI > Meter and Control tree view (the terminal STATUS report is similar).
Figure 10.9 is the STATUS A report showing all status information on a terminal.
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