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Figure 22 - Withdrawable assembly for circuit breaker, with auxiliary switches
4.2.3.2 Other withdrawable parts
The withdrawable part can also be fitted with
following trucks:
•
Metering potential transformers trucks with
fuses. (Refer sec.: 7.3.4)
•
Earthing truck without making capacity
(for main busbar system and power cables)
These earthing trucks are intended for fail-safe
temporary earthing in cubicles for UniGear ZS2
type indoor switchgear. This earthing truck is
suitable to earth a circuit which is in OFF
condition. This earthing truck can sense the
voltage even if put into a live circuit, which will
prevent further racking-in by means of an
interlock thereby ensuring safety of the operator.
It is recommended that the circuit to be earthed
be switched OFF before using this earthing truck.
Earthing trucks are available in two versions:
•
For earthing the main busbar system
•
For earthing power cables
For ensuring maximum safety to the operator
and highest plant reliability against accidental
switching on the circuit, during scheduled or
unscheduled maintenance, it is highly
recommended to withdraw the circuit breaker
entirely out the switchgear and shorting
the circuit with main earthing by means of
earthing truck.
S8
Test position indicator
S9
Service position indicator
10.2 Control wiring plug connector for
Withdrawable assembly
18.1 Square spigot
S8
18.2 Hole in spindle for insertion lever
spindle
S9
10.2
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Figure 23 - Low Voltage compartment
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Figure 24 - Low Voltage compartment internal wiring
15
18.1
18.2
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