GE PVDB-28kV Instructions Manual page 12

Distribution Breaker Section 4. Insta
2. Insert the closing spring gag plate (Fig. 7) by
engaging the detents on the gag plate into the slots
on the closing spring guide. With the gag plate in
position, depress the manual close button. This
action will partially close the vacuum interrupter
contact. Do not energize the secondary control
circuit at this time.
Safety Precautions
1. Check that the unit is properly set up and leveled
on its foundation.
2.
Check that all nuts, washers, bolts, snap rings, cotter
pins and tenninal connections are in place and
tightened.
3.
Visually inspect the circuit breaker for any signs of
damage during installation and test it for possible
grounds or short circuits.
4. Inspect all insulated wiring to see that it has
sustained not damage during installation and test it
for possible grounds or short circuits.
5.
Check that all bearing surfaces of the operating and
breaker mechanisms have been lubricated with
0282A2048POO9 grease.
6. Check that all points where the surface of the paint
has been damaged during installation are re-
painted immediately.
Figure 7. Close Spring Gag
3. To manually slow-close the breaker contacts, insert
the manual charging handle in the manual charge
slot and move the handle up and down about 6 to 7
times until closing roller (Fig. 3, 10) is free from the
closing cam and resting on the close prop (Fig. 3,
11 ).
III#'
4-7 Slow Closing
1. Manually charge the breaker closing spring using
the charging handle provided (Fig. 6). The closing
spring is charged by a ratcheting mechanism that
advances by one ratchet tooth at a time. When the
spring is fully charged and the spring load is held by
the closing latch the spring indicator will change
from "'DISCHGD" to "CHARGE" (Fig. 7), and a
positive snap will be heard as the spring travels over
center. Mter the spring is completely charged, as
indicated above, further forcing th~ charging
handle may cause damage to the closing latch and
its associated parts.
CAUI10N: With the gag plate installed, the breaker
closed and opening springs charged, the breaker can be
tripped at full speed.
4. In the closed position, check the erosion indicator
(Fig. 11). Check the insulation resistance to ground
by connecting a megohmeter between the primary
circuit and ground. The minimum resistance
should be 10,000 megohms or higher.
5.
Keep clear and push the manual trip push-button to
trip the breaker open. Check that the position
indicator shows "Open" and the operation counter
advances one count. Remove the closing spring gag
plate.
6. Discharge any stored energy in the breaker by
successively depressing the manual close and
manual trip buttons. Performing these operations
leaves the breaker open with the closing spring
discharged.
""
Figure 6. Manual Charging
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