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4.3 Switchgear typical compartments
4.3.1. Low voltage compartment
The low voltage compartment (Figure 25), houses all
the standard low voltage equipment:
terminal boards and cables (in special ducts);
measurement instruments, protection relays,
signalling and operating devices on the low voltage
compartment door;
cable outgoing passage for interconnecting the
cubicle panels;
circuit-breaker nameplate (Figure 48)
voltage presence indicating system (ENA version
only; in IEC version it is fitted on front label of the
panel).
A wiring duct (Figure 26) for the auxiliary connections
between the various units and external apparatus is
installed on the side of the low voltage cubicle.
4.3.2. Busbar compartment (Figure 27)
The busbar compartment contains the three-position
disconnector and the power circuit main busbar
system, which allows electrical connections among the
compartments of the switchgear.
The main busbars are fixed to the branch connectors
(Figure 27) of the upper fixed contacts of the three
position disconnector.
4.3.3. Circuit-breaker and cable compartment
(Figure 31).
The metal structure, provided with metallic
segregations on all sides, houses the following
components:
circuit-breaker
power cable terminals (Figure 28)
current and voltage transformers (if fitted)
voltage presence indicating system (IEC version
only; in ENA version it is fitted in LV compartment
door)
anti-condensation heater
The controls of the circuit-breaker, three-position
disconnector and the voltage presence indicating
system are fitted on the front of the compartment. The
rear, in the IEC version, is closed with a removable
cover (Figure 29), while in the ENA version (Figure
30) the rear is closed with removable covers equipped
with flaps for evacuation of the gases.
Figure 25: Low voltage compartment.
Figure 26: Wiring duct – detail 1.
Figure 27: Busbar compartment.
Figure 28: Power cable terminals.
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