20
3 . s w I TC h G e a r D e s C r I p T I o N
Primary disconnect shutters
Primary disconnect shutters, Fig. 3.12, are
available as options to provide protection against
contact with the energized stationary primary
disconnects when the breaker is removed from its
compartment. Shutters are supplied as standard
components in the main and tie breaker
compartments of double-ended substations.
The shutters are constructed from glass-
reinforced polyester insulating material.
The shutters (movable barriers) prevent frontal
access to the primary disconnect line and load
stationary disconnects.
The shutters are closed when the breaker is in the
DISCONNECT Position. As the circuit breaker is
racked from the DISCONNECT Position to the TEST
Position the shutters remain fully closed. As the
breaker is racked from the TEST Position to the
CONNECTED Position, the shutters open allowing
the breaker to connect to the primary disconnects.
Figure 3.13 shows the shutter assembly with the
shutter in the open position.
Danger: Hazard of electrical shock or burn.
Turn off power to this equipment before
working inside.
1. Cassette side barrier
2. Shutter assembly (closed)
3. Secondary disconnects
4. Draw-out rails
5. Racking shaft
—
Fig. 3.12
Primary disconnect
shutter assembly (shown
in closed position)
—
Fig. 3.13
Primary disconnect
shutter assembly (shown
in open position)
—
Fig. 3.12
—
Fig. 3.13
3
2
1
5
4
1
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