Date Code 20020129
Testing and Troubleshooting
10-3
SEL-387E Instruction Manual
Target LED Illumination
During testing use target LED illumination to determine relay element status. Using the
TAR F
command, set the front-panel targets to display the element under test. Monitor element pickup
and dropout by observing the target LEDs.
For example, the Winding 1 phase definite-time overcurrent element 50P11 appears in Relay
Word Row 2. When you type the command
TAR F 50P11 <ENTER>
, the terminal displays the
labels and status for each bit in the Relay 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. Reset these targets by pressing the front-panel
<TARGET RESET>
button, 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 ALIASn settings, in which case the ALIAS will
appear in the report. Clear the SER report with the
SER C
command.
