10.2
SEL-400 Series Relays Instruction Manual Date Code 20171006
Testing, Troubleshooting, and Maintenance
Testing Philosophy
Commissioning Testing
SEL performs a complete functional check and calibration of each SEL-400
series relay before shipment so that your relay operates correctly and accurately.
You should perform commissioning tests to verify proper connection of the relay
to the power system and all auxiliary equipment. Check control signal inputs and
outputs. Check breaker auxiliary inputs, SCADA control inputs, and monitoring
outputs. Use an ac connection test to verify that the relay current and voltage
inputs are the proper magnitude and phase rotation.
Brief fault tests confirm that the relay settings and protection scheme logic are
correct. You do not need to test every relay element, timer, and function in these
tests.
At commissioning, use the relay METER command to verify the ac current and
voltage magnitude and phase rotation (see Examining Metering Quantities on
page 3.35).
Use the PUL command to pulse relay control output operation. Use the TAR
command to view relay targets and verify that control inputs are operational. Use
TEST DB, TEST DB2, and TEST FM to check SCADA interfaces. (See TEST
DB on page 14.55, TEST DB2 on page 14.56, and TEST FM on page 14.57 for
information on these relay commands.)
Table 10.2 lists guidelines for commissioning testing. For further discussion of
these tests, see Checking Relay Operation in Section 3: Testing of the product-
specific instruction manual.
Table 10.1 Acceptance Testing
Details Description
Time Test when qualifying a relay model for use on the utility system.
Goals a) Confirm that the relay meets published critical performance specifications
such as operating speed and element accuracy.
b) Confirm that the relay meets the requirements of the intended application.
c) Gain familiarity with relay settings and capabilities.
Test Test all protection elements and logic functions critical to your intended application.
Table 10.2 Commissioning Testing
Details Description
Time Test when installing a new protection system.
Goals a) Validate all system ac and dc connections.
b) Confirm that the relay functions as intended using your settings.
c) Check that all auxiliary equipment operates as intended.
d) Check SCADA interface.
Tests Test all connected/monitored inputs and outputs, and the polarity and phase rota-
tion of ac connections. Make simple checks of protection elements. Test commu-
nications interfaces.
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