Schweitzer Engineering SEL-351P - SEL-351 P Self-Tests

Date Code 990215 Testing and Troubleshooting 13-5
SEL-351P Manual Técnico
To test the phase time-overcurrent element 51P1T with the SER, make the following setting:
SER1 = 51P1 51P1T
Element 51P1 asserts when phase current is above the pickup of the phase time-overcurrent
element. Element 51P1T asserts when the phase time-overcurrent element times out. The
assertion and deassertion of these elements is time-stamped in the SER report. Use this method
to verify timing associated with time-overcurrent elements, reclosing relay operation, etc. Do not
forget to reenter the correct SEL-351P settings when you are ready to place the SEL-351P in
service.
SEL-351P S ELF -T ESTS
The SEL-351P runs a variety of self-tests. The SEL-351P takes the following corrective actions
for out-of-tolerance conditions (see
Table SECTION 13: .1):
• Protection Disabled: The SEL-351P disables overcurrent elements and trip/close logic.
All output contacts and FETs driving the trip and close pins of the control cable are
deenergized. The EN front-panel LED is extinguished.
• ALARM Output: The ALARM output contact signals an alarm condition by going to its
deenergized state. If the ALARM output contact is a B contact (normally closed), it
closes for an alarm condition or if the SEL-351P is deenergized. If the ALARM output
contact is an A contact (normally open), it opens for an alarm condition or if the
SEL-351P is deenergized. Alarm condition signaling can be a single 5-second pulse
(Pulsed) or permanent (Latched).
• The SEL-351P generates automatic STATUS reports at the serial port for warnings and
failures.
• The SEL-351P displays failure messages on the LCD display for failures.
Use the serial port STATUS command or front-panel STATUS pushbutton to view control
self-test status.
Table SECTION 13: .1: SEL-351P Recloser Control Self-Tests
Self-Test Condition Limits
Protection
Disabled
ALARM
Output Description
IA, IB, IC,
IN, VA, VB,
VC, VS
Offset
Warning 30 mV No Pulsed Measures the dc offset at
each of the input
channels every 10
seconds.
Master
Offset
Warning 20 mV No Pulsed Measures the dc offset at
the A/D every 10
seconds.
Failure 30 mV Yes Latched
+5 V PS Warning +4.80 V
+5.20 V
No Pulsed Measures the +5 V power
supply every 10 seconds.