83
Earthing switch for busbar earthing
• Top-mounted box 1 (Figure 128) with screw
fixing material from the “top-mounted box
for earthing” set of bags must be mounted
on the busbar compartment.
• Operating mechanism box 3 with screw
fixing material from the “top-mounted box
for earthing” set of bags must be mounted
on the low voltage compartment.
• Pre-mounted single parts of hexagonal shaft
2 must be removed. Please pay attention to
the sequence and angling of the parts!
• The hexagonal shaft from the operating
mechanism box must be pushed through into
the bevel gear of the earthing switch. The
sequence and angles of the part must be
restored!
• Connecting bars 4 (Figure 130) with the
branch conductors at the junction point must
be screwed together according to (Figure
122), (Figure 124). However, if necessary,
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 earthing” set of bags must be used.
• Insulating cover 10 (Figure 124) must be
brought into position as described in "6.7
Installation of the busbars".
Note:
The auxiliary switches for the earthing switch are
adjusted at the factory. Correct operation is only
guaranteed if the working elements on the
hexagonal shaft are correctly mounted. During
final installation of the earthing switch and
operating mechanism on site, it may be necessary
to make precise adjustment of the auxiliary
switches. In this case, the following is important:
• The auxiliary switch OFF 1 (Figure 129) must
be operated before slide 3 has uncovered half
of the opening in front of the hexagonal shaft
and before the lower edge of the slide has
touched the anchor of locking magnet 4.
• The auxiliary switch ON 2 must be operated
before the toggle spring of the earthing
switch has reached its dead centre point.
• The push-rod of the auxiliary switch must
still have about 0.5 mm to go to the end
position in the operated position.
—
6. Assembly of the switchgear at site
Figure 128:
1 Top-mounted box
2 Hexagonal shaft
3 Operating mechanism box
Busbar earthing switch
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