ABB Uniswitch Operation And Maintenance Manual page 14

Figure 3.4
Low-voltage compartment,
internal view
Figure 3.5
HD4 type circuit-breaker -
side view
ABB
Uniswitc h Operation and
Maintenanc e Manual
withdrawable part moves to the disconnected position. In the
test/disconnected position of the withdrawable part, partitioning by
separation is established in the main current circuit. Connection of
the control wiring, required for test purposes, need not be
interrupted when in the test/disconnected position.
•
In the test/disconnected position, the withdrawable part is still
completely inside the cubicle with the door closed. The ON/OFF
pushbutton located on the circuit-breaker, and the mechanical
indicators for ON/OFF and CHARGED/DISCHARGED can be
observed through an inspection window.
•
The socket (50.1) (Figure 4.8) for the control wiring is mounted in
the circuit-breaker compartment.
•
Current transformers (45.1) (Figure 3.2), fixed and voltage
transformers (45.2), and earthing switch (46.1), are fitted according
to individual operating requirements in each case.
•
The voltage transformers mounted fixed are connected on the
primary side with flexible, fully-insulated cables which are inserted
into the transformers.
•
The EM type earthing switch can be used with a manually-operated
mechanism. Its switching position will be indicated both
mechanically and electrically by means of the auxiliary switch.
•
In the cubicle, up to two parallel plastic cables can be connected
with single-core cable protection and push-on sealing ends.
3) Control and Secondary Apparatus Compartment (4) (see Figure
3.4)
The control cabinet is for all control and protection aspects, suitable for
both conventional or microprocessor control technology.
If the secondary devices are not intended for door installation, they are
mounted on the bottom of the LV-compartment.
4) Withdrawable parts (see Figure 3.5)
The withdrawable circuit-breaker forms a complete module consisting
of:
•
SF6 type HD4 circuit-breaker or VD4 type vacuum circuit-breaker
•
the withdrawable assembly (60)
•
isolated contact arm (44.2) with contact system (44.3)
•
control wiring plug (44.4).
The withdrawable assembly (60) and the circuit-breaker are coupled via
a multi-pole control wiring plug connector (44.6) (Figure 3.6).
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UNI S14GB 05-02