
10.3
Date Code 20020903
SEL-587Z Instruction Manual
Testing and Troubleshooting
Testing Methods and Tools
CAUTION:
Equipment
components are sensitive to
electrostatic discharge (ESD).
Undetectable permanent damage
can result if you do not use proper
ESD procedures. Ground yourself,
your work surface, and this
equipment before removing any
cover from this equipment. If your
facility is not equipped to work with
these components, contact SEL
about returning this device and
related SEL equipment for service.
!
You can test the input module two different ways:
Measure the outputs from the input module with an accurate voltmeter,
and compare the readings to accurate instruments in the relay input
circuits,
or
Replace the ribbon cable, press the front-panel
{METER}
pushbutton,
and compare the relay readings to other accurate instruments in the relay
input circuits.
Figure 10.1
Low-Level Test Interface.
Test Methods
Test the pickup and dropout of relay elements using one of three methods:
front-panel target LCD/LED indication, output contact operation, or the
Sequential Events Recorder (SER).
Target LED Illumination
During testing use target LED illumination to determine relay element status.
Using the
TAR
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 phase instantaneous overcurrent element 50P1 appears in
Relay Word Row 3. When you type the command
TAR 3<Enter>
, the
terminal displays the labels and status for each bit in the Relay Word Row (3),
and the LEDs display their status. Thus, with these new targets displayed, if
the Level 1 phase instantaneous overcurrent element (50P1) asserts, the top
row, right-side LED illuminates. See
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 L
n
command, enter the Relay
Word bit name of the element under test. For example, setting OUT4 = 50P1
results in output contact OUT4 closing when 50P1 asserts.
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.
Input Module Output : 71.43 mV at Nominal Current (1 A or 5 A)
Processing Module Input : 6.2 V p-p Maximum
U.S. Patent 5,479,315
GND
GND GND
GND
GND
+10V
GND
-10V
IC
IB
IA
87C
87A
87B
Содержание SEL-587Z
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