Schweitzer Engineering SEL-387-0, Instruction Manual

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10.3
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Testing and Troubleshooting
Acceptance Testing
Word row (2) and the LEDs display their status. Thus, with these new targets
displayed, if the Winding 1 phase definite-time overcurrent element (50P11)
asserts, the far left LED illuminates. See
Section 4: Control Logic for a list of
all Relay Word elements.
Be sure to reset the front-panel targets to the default targets after testing before
returning the relay to service. This can be done by pressing the front-panel
{TARGET RESET} pushbutton or by issuing the TAR R command from the serial
port.
Output Contact Operation
To test using this method, set one programmable output contact to assert when
the element under test picks up. With the
SET n command, enter the Relay
Word bit name of the element under test.
For an a contact, when the condition asserts, the output contact closes. When
the condition deasserts, the output contact opens.
For a b contact, when the condition asserts, the output contact opens. When
the condition deasserts, the output contact closes.
Programmable contacts can be changed to a or b contacts with a solder
jumper. Refer to
Section 2: Installation for jumper locations. Using contact
operation as an indicator, you can measure element operating characteristics,
stop timers, etc.
Tests in this section assume an a output contact.
Sequential Events Recorder (SER)
To test using this method, set the SER to trigger for the element under test.
With the
SET R command, put the element name in the SER1, SER2, SER3,
or SER4 setting.
Whenever an element asserts or deasserts, a time stamp is recorded. View the
SER report with the
SER command. The SER report will list the actual
element name (Relay Word bit), unless this bit has been renamed using one of
the ALIAS
n settings, in which case the ALIAS will appear in the report. Clear
the SER report with the SER C command.
Acceptance Testing
When: When qualifying a relay model to be used on the utility system.
Goals:
➤
Ensure relay meets published critical performance
specifications such as operating speed and element accuracy.
➤
Ensure that the relay meets the requirements of the intended
application.
➤
Gain familiarity with relay settings and capabilities.
What to test: All protection elements and logic functions critical to the
intended application.