Schweitzer Engineering SEL-387-0, Instruction Manual

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10.32
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Testing and Troubleshooting
Commissioning Testing
06/09/00 07:27:39.752 IN101 Deasserted
06/09/00 07:37:16.315 TO1 Asserted
06/09/00 07:39:16.689 TO2 Asserted
06/09/00 07:41:16.436 HS1 Asserted
06/09/00 07:44:16.448 HS2 Asserted
06/09/00 07:46:17.062 FAA1 Asserted
06/09/00 07:49:16.316 FAA2 Asserted
Commissioning Testing
When: When installing a new protection system.
Goal:
➤
Ensure that all system ac and dc connections are correct.
➤
Ensure that the relay functions as intended using your settings.
➤
Ensure that all auxiliary equipment operates as intended.
What to test: All connected or monitored inputs and outputs; polarity and
phase rotation of ac current connections; simple check of protection elements.
SEL performs a complete functional check and calibration of each relay
before it is shipped. This helps ensure that you receive a relay that operates
correctly and accurately. Commissioning tests should verify that the relay is
properly connected to the power system and all auxiliary equipment. Verify
control signal inputs and outputs. Check breaker auxiliary inputs, SCADA
control inputs and monitoring outputs. Use an ac connection check to verify
that the relay current inputs are of the proper magnitude and phase rotation.
Brief fault tests ensure that the relay settings are correct. It is not necessary to
test every relay element, timer, and function in these tests.
At commissioning time, use the relay METER DIF command to record the
measured operate and restraint values for through-load currents. Use the
PULSE command to verify relay output contact operation.
Use the SEL-387-0, -5, -6 Relay Commissioning Test Worksheet , located at the
end of this section, to verify correct CT connections and settings when placing
the relay in service. The worksheet shows how using software commands or
the front-panel display can replace the need for the traditional phase angle
meter and ammeter.
Maintenance Testing
When: At regularly scheduled intervals, or when there is an indication of a
problem with the relay or system.
Goals:
➤
Ensure that the relay is measuring ac quantities accurately.
➤
Ensure that scheme logic and protection elements are
functioning correctly.
➤
Ensure that auxiliary equipment is functioning correctly.
!
WARNING
Before working on a CT circuit, first
apply a short to the secondary winding
of the CT.