Figure 8
Wipe Gauge
Vacuum Interrupter
Operating Rod
Screw
Erosion Indicator
Disc (orange)
Contact Wipe
Spring Assembly
Wipe Indicator
Gauge
0282A2459G001
2) Checking
a. Close the ground and test device and
block the trip latch against the frame
to prevent accidental opening. Use a
3/8-16 (with 2 5/8 inch minimum thread
length) bolt in the trip latch blocking
hole. Screw the bolt in until it just
contacts the trip latch.
b. Insert gauge 0282A2459G001
(Figure 8) over the orange erosion
disc and align the screw with the top
of the wipe indicator. Turn the screw
until it just touches the wipe indicator.
Carefully hold the screw in position
while removing the gauge. Measure
the extension of the screw below the
gauge plate bottom using a dial caliper
and record this reading. Perform this
measurement on all three phases.
c. Measure the position of the operating
rod (Figure 7, d) relative to the ground
and test device frame. Measure all
three phases. (SUGGESTION: place
a piece of masking tape vertically
on the operating rod. Using a block
(approximately 2” high) that spans the
ground and test device mechanism
frame, draw a line on the tape to
indicate the position when the ground
and test device is closed. Leave the tape
in place. Then in
step f
draw another
line on the tape when the ground and
test device is opened. The distance
between these lines is the gap for that
phase.
d. Remove the trip latch blocking bolt
installed in
step a
and open the ground
and test device by pushing the manual
trip push button.
e. Repeat
step b
to measure the position
of the wipe indicator with the ground
and test device open. Subtract the two
measurements of the screw length to
obtain the wipe of each phase.
f. Repeat
step c
to measure the position of
operating rod with the ground and test
device in the open position. Subtract
the two measurements to obtain the
vacuum interrupter contact gap for
each phase. (If the suggestion in
step c
was followed, remove the tape from the
operating rod, place it on a flat surface
and measure the gaps directly as the
distance between the two lines on the
tape).
g. Compare the wipes and gap measured
with the
Table A Wipe and Gap
Measurements
.
Table A Wipe and Gap Measurements
Interrupter
Wipe (inches) Gap (inches)
49A & 69A
(50kA and below)
.156 minimum
.375 to .425
68A (63kA)
.155 minimum
.450 to .550
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19
Mechanical Checks and Adjustments
01.4IB.50100
