17
A B
—
Figure 25 -
A) Closed position of door’s handle;
B) Not closed position of door’s handle.
4.3.2 Door interlocking
UniGear ZS2 is equipped with the following door
interlocks:
• The circuit breaker can be racked in from Test
to Service position only when door is closed.
(Fig. 25.1)
• The circuit breaker compartment door cannot
be opened if the circuit breaker is in Service or
in any undefined positions (Fig 25.2)
• The compartment door cannot be opened
if the earthing switch is open.
4.3.3 Interlocks between switchgears
The interlock between the switchgears can be
achieved by using the electrical schematic
controls.
Lock Condition
1
A
Apparatus
racking-in/out
Apparatus closed
B Apparatus closing Undefined truck position
2
A
Apparatus
racking-in
Apparatus control wiring
connector unplugged
B
Apparatus control
wiring connector
plug-out
Truck in service or undefined
position
3
A
Earthing switch
closing
Truck in service or undefined
position
B
Apparatus
racking-in
Earthing switch closed
Note: Apparatus are circuit breakers
—
Figure 25.1 - Circuit breaker compartment door enabling device
—
Figure 25.2 - Circuit breaker truck enabling slot
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