GEK-49861
prevent high frequency transient potential differences from entering
the solid state circuitry.
Therefore, with Terminal 10 connected to
ground the surge capacitors are connected between the input terminals
and the case.
When hipotting the relay, the procedure given in
DIELECTRIC TESTS under the ACCEPTANCE TESTS section of this book must
be followed.
TEST PLUGS
The relay may be tested without removing it from the panel by
using a 12XLA13A test plug.
This plug makes connections only with
the relay and does not disturb any shorting bars in the case.
Of
course, the 12XLA12A test plug may also be used.
Although this test
plug allows greater testing flexibility, it also requires current
transformer shorting jumpers and the exercise of greater care since
connections are made to both the relay and the external circuitry.
Addi tiona! information on the XLA test plugs may be obtained from
instruction book GEI-25372.
INSTALLATION TESTS
Since operating
companies use many different
procedures for
installation tests, the section under ACCEPTANCE TESTS contains all
necessary tests which may be performed as part of the installation
procedure at the discretion of the user.
The minimum suggested tests are as follows:
1.
VISUAL INSPECTION
Repeat the i terns described under ACCEPTANCE TESTS - VISUAL
INSPECTION.
2.
MECHANICAL INSPECTION AND ADJUSTMENTS
Repeat the items described under ACCEPTANCE TESTS - VISUAL
INSPECTION.
3.
TARGET UNIT
Set the target unit tap screw in the desired position.
The
adjustment
will
not
be
disturbed
if
a
screw
is
first
transferred from the left plate to the desired tap position
on the right tap plate and then removing the screw in the
undesired tap and transferring it to the left plate.
4.
REACH TESTS
a)
Using the values selected in the CALCULATION OF SETTINGS
section of this book, set:
Base reach (ZRI) on the back of the relay
Percent restraint (T) on the front panel potentiometer
b)
Measure the relay reach at 85°
as described in the
ACCEPTANCE TESTS section of this book.
26
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