10.7
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Testing, Troubleshooting, and Maintenance
Test Methods
the relay database structure to use the TEST DB command effectively; see
Section 10: Communications Interfaces in the product-specific instruction man-
ual for more information.
TEST DB2 Command
Use the TEST DB2 command to test the DNP3 and IEC 61850 interfaces. Values
you enter are “override values.” For more information on DNP3, see Section 16:
DNP3 Communication. For more information on IEC 61850, see Section 17: IEC
61850 Communication.
TEST FM Command
Use the TEST FM command to override normal Fast Meter quantities for testing
purposes. You can only override “reported” Fast Meter values (per-phase volt-
ages and currents). You cannot directly test Fast Meter values that the relay
derives from the reported values (power, sequence components, etc.). For more
information on Fast Meter, see SEL Fast Meter, Fast Operate, Fast SER Mes-
sages, and Fast Message Data Access on page 15.28.
Test Methods
Use the following methods to conveniently test the pickup and dropout of relay
elements and other relay functions:
➤ Target indications (element pickup/dropout)
➤ Control output closures
➤ SER reports
The tests and procedures in the following subsections are for 5 A relays. Scale
values appropriately for 1 A relays.
Once you have completed a test, return the relay settings that you modified for
the test to default or operational values.
Testing With Relay Word Bits
Use the communications port TAR command or the front panel to display the
state of relay elements, control inputs, and control outputs. Viewing a change in
relay element (Relay Word bit) status is a good way to verify the pickup settings
you have entered for protection elements. See Examining Relay Elements on
page 3.43 for more information on examining relay elements using a terminal
and from the front panel.
Testing With Control Outputs
You can set the relay to operate a control output to test a single element. Set the
SEL
OGIC control equation for a particular output (OUT101–OUT108, for exam-
ple) to respond to the Relay Word bit for the element under test. See Operating
the Relay Inputs and Outputs on page 3.61 for configuring control inputs and
control outputs. Section 11: Relay Word Bits in the product-specific instruction
manual lists the names of the relay element logic outputs.
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