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•
Ensure that the circuit breaker is in OFF
condition (in case of VCB)
•
Fit hand crank on square spigot of the spindle
mechanism inside the racking hole by turning
the knob provided on the door. (Fig. 78)
•
Turn the crank clockwise (30 turns) until the
breaker or withdrawable truck reaches the
Service position and stops
•
Observe the position indicator on low voltage
compartment
•
Remove hand crank
4.5.1.2 Racking-out from Service to
Test position
Manual withdrawal from the service position into
the Test/ Disconnected position:
•
Ensure that the circuit breaker is in
OFF position
•
Fit hand crank on square spigot of the spindle
mechanism inside the racking hole by turning
the knob provided on the door. (Fig. 78)
•
Turn the crank anti-clockwise (30 turns) until
the breaker or withdrawable truck reaches the
Test position and stops.
•
Observe the position indicator on low voltage
compartment
•
Remove hand crank
Note:
•
The withdrawable part shall not be stopped at
any intermediate position in the travel range
between Service and Test / Disconnected
position.
•
The circuit breaker compartment door can be
opened only when the circuit breaker is in test
position.
•
The Trolley can be removed from switchgear
by sliding tracking mechanism handles
towards the square spigot of the spindle
mechanism at the center of the circuit breaker,
and then pulling the whole trolley out of the
switchgear.
4.6 ICOG- Incoming and outgoing type
switchgear
4.7 Ith Limiter
Upon request, UniGear ZS2 switchgear can also
be equipped with Ith limiters on the top of each
unit to generate a fault signal, immediately,
when the pressure relief flaps are open.
•
Reaction time is less than 15 ms.
•
The signals from Ith limiters can be sent
directly to circuit breaker OFF trigger.
It is additional safety feature on the top of each
panel. The microswitch generates an immediate
fault signal when the overpressure flap is opened.
Reaction time is less then 15 ms. The signal from
the microswitch can be sent directly to trigger
the circuit-breaker OFF.
It is necessary to adjust the centre of the switch
knob of the auxiliary switch to the centre of the
pressure relief flap's hole. Correct value of the
adjustment of the auxiliary switches' height in the
pressed position according to the particular type
of the switch is indicated in following pictures.
—
Figure 29 - Ramp for circuit breaker trolley
—
Figure 30 - Complete cubicle assembly
21
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