79
6.8 Installation of the top-
mounted boxes
For ease of transportation top mounted boxes
are delivered separate from the panel in pre-
assembled sections.
Voltage transformer for busbar metering
• Top-mounted box 1 (Figure 126) with screw
fixing material in the set of bags “Top-
mounted box for metering” must be mounted
on the busbar compartment. In panels
without busbar bushing plate the partition
between the busbar compartment and the
topmounted box is necessary. They are
installed at the factory in the top-mounted
box. As far as equipment with busbar
partitioning is concerned (i.e. with bushing
plate), the space between the busbar
compartment and the top-mounted box
must remain open for pressure relief.
• Connecting bars 1 with branch conductors 5
at the junction point must be screwed
together according to (Figure 122) (Figure
124). However, if necessary, the additional
spacer plate 2 (Figure 122) and threaded plate
9 (Figure 124), as well as the screw fixing
material from the “top-mounted box for
metering” set of bags must be used.
• Insulating cover must be placed into position
as is described in "6.5 Installation of the
bushing".
• Intermediate box (Figure 126), (Figure 127)
with the screw fixing material from the “top-
mounted box for metering” set of bags must
be mounted on the low voltage
compartment. Conduction tube must be
positioned and inserted in reducer rings.
• Secondary circuits from the voltage
transformers must be led to the terminal
strips and connected according to the cable
core markings and circuit diagram.
—
6. Assembly of the switchgear at site
Figure 121:
1 Connection bar
2 Spacer plate, 8 mm thick
3 Tapped plate
4 Spacer plate, 5 mm thick
Panels 12 / 17.5 kV - Bar connection to the top-mounting box. The
figure shows the arrangement in panels the busbar ends
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