22
A DVAC® 3 8 K V I N STA LL ATI ON , OPE R ATI ON A N D M A I NTE N A NCE M A N UA L
—
Maintenance
Activating the closing push button rotates the
closing shaft and releases the closing hook
1
. The
stored energy of the closing spring is transferred
to the closing lever assembly
2
which pushes the
long levers of the cam/toggle assembly connected
by a pin
3
. The long levers move the main shaft
counter-clockwise
4
which transfers the motion
to the push rods connected to the contacts in the
vacuum interrupters. The breaker signals that it
is closed .
1
1
5
4
3
2
10
9
8
6
The long levers reach their settled position
6
once
the breaker is closed and are held by the central
hook of the cam/toggle assembly
8
. The contact
springs inside the poles and the opening spring
inside the frame are charged. The contact springs
maintain contact pressure while the breaker is in
the closed position. The central hook applies force
to the opening hook
9
which is locked by the
opening shaft
10
.
