Note: Descriptions are shown in the official language in which they were submitted.
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DESCRIPTION
The inYention relates to a low-voltaæe
electric switching system.
Low-voltage electric switching systems
are known which comprise a cabinet having a
space ~or connection with terminals for the
power output and the control current, adjacent
a space containing inserts disposed in a
number of tiers and bearing electric appliances
and plugs at the back for the power input. The
power output and the control current7 counter-
contacts for the power output and control currents,
wired to the correspondingly named terminals, are
disposed behind the inserts in the cabinet, and
the device also has a three-phase group of vertical
busbars for the power inpu1; which are adapted to
recei~e plugs.
~ . system of this kind is known from Germ~
Offenlegungsschrift 25 15 152. Its main disad~antage
is th~t the terminals in the space for co~nections
must ba wired in the cabinet to the plugs in the
rear insertion space~ which of course is very
complicated.
An ob~ect of the invention is to provide
~n economic, ad~antageous low-voltage electric
switching system wherein the wiring work is
simpler and more economic.
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According to the present in~ention there is
provided a low-voltage electric switching system
comprising a cabinet ha~ing a space for connections
with terminals for the power output and the control
current, adjacent a space cont~ining inserts
disposed in a number o~ tiers and bearing electric
appliances and plug5 at the back ~or the power
input, the power output and the control current~
counter-contacts for the power output and control
currents, ~ired to the correspondingly named
terminals, being disposed behind the inserts in the
cabinetg and the device also comprisi~g a three~phase
group of vertical busbars for the power input,
adapted to receive plugs, characterised in that
the counter-plugs ~or the power output and the
control current, the associated terminals and the
corresponding wiring per tier, which can be produced
in the factory, are disposed on a pre~abricated
assembly unit mounted in the cabinet.
5ince the assembly unit can be pre-assembled
and wired in the factory, outside the cabinet
and then only has to be secured in the cabinet, th~
assembly work is greatly reduced and also made more
pleasant.
It is thus possible to assemble the cabinet
simply by using plug and screw connections, since
welding work9 for example, can be done at the fao-tory.
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This ma~es assembly at the place of use more
advantageous.
If a number of independent appliances or
group~ thereof are in the same insert or a number
o~ inserts are on the same tier theny according
to a preferred embodiment o~ the in~ention,
it is not necessary to provide a corresponding
number o~ groups of` vertical busbars9 but the
assembly unit in question can have a group of
horizontal distribution bars disposed between
the insert and the vertical busbars and each
adapted to be connected by plugs to a busbar
and to each independent appliance or each
insert.
Another ad~antage of the invention is that
the assembly unit can form the back wall of the
insert space and the co~nection space, behind
which the ~ertisal busbars oan extend7 ~hich
in turn are in ~ront of the l~ads. For example,
the leads ~or a number of cabinets ca~ be disposed
in a back plane J the vertical busbars in a
plane ~urther to the front~ and the assembly
unit and horizontal distribution bars in a plane
still further to the front.
Ad~antageously the distribution bars ha~e
rear plugs engaging the busbars and ~ront plugs
engaging the counter plugs o~ the inserts or
indi~idual appliances.
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The i~ention will be described no~ by way
of example only with re~erence to the drawings
in which:
Figure 1 shows part of a parallel projection
o~ a cabinet disposed at the e~d o~ a row of
cabinets;
Figure 2 is a parallel projection o~ an
assembly unit on a larger scale than in Figure 1;
Figure 3 is a partial plan view of a tier
o~ a Gabinet with two inserts9 on the same
scale as Figure 2, and
Figure 4 is a parallel projection on
substantially the same scale as Figures 2 and 3,
showing the co~operative action of leads, busbars
and distribution bars.
In the drawing the proportions may be
distorted, ~or ease o~ dra~ing9 and most parts,
for ~implicity, are shown in outline only.
- Figure 1 shows a cabinet comprising
a vertical space 1 for receiving inserts
ad~acent a ~ertical space 2 ~or connections
and separated ~herefrom by a partition 3 (shown by
a broken line).
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The back wall of spaces 1 and 2 is made
up of assembly units 4, one of which is shown
on a larger scale in Figures 2 and 3.
Behlnd u~its 4 there is a busbar space 5
containing horizontal leads 6 and Yertical
busbar~ 7, shown in Figures 3 and 4. As
shown in Figure 4 each lead 6 is connected
to a busbar 7 at places 70. Each lead 6 and
each busbar 7 corresponds to one of three
phases of the input power.
Figure 4 shows four co~plete tiers 10,
the top containing two insert~ 11, the next
from the top containing three inserts 12,
the bottom containing one insert 13 and the
next from the bottom contai.ning four inserts
14.
With reference to Figures 2~ 3 and 4
the tier with two in~erts 11 will bè discussed.
Assembly unit 4 (Figures 2 and 3) haæ a
metal bearing plate 40 to which three distribution
~ars 42 Are secured ~ia spacers 41 (Figure 3
made o~ insulating material. Plate 40 also
bears two multiple plugs 43 connected at the
factory by wiring 44 to terminals 459 46
secured to plate 40 ln the connecting part
of unit 4. Terminals 45 pro~ide a power output
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and are connected by wiring 44 to the interiorof each plug 4~.
As Figure 3 shows, cou~ter plugs 430 of
inserts 11 engage plugs 43 w~en the inserts
are inserted as shown.
If there was only one insert on the
tier in question there would be no need of
bars 42 on unit 4, because the input power
could be directly taken from bars 7 by plugs.
In the present case, however, the tier has
two inserts 11, each of which must be supplied
with the input power. This is supplied to
them by the distribution bars 42 which are
disposed on plate 40 in the manner described~
Accordingly9 bars 42 each have a rear plug
420 which is plugged to a busbar 7 in the
manner shown in Figures 3 and 4 whe~ unit 4
is inserted into the appropriate tier in the
cabinet. Each bar 42 ha~ a front plug 421
~or each insert to be connected thereto~
Plugs 421 are accessible in unit 4 behind
windows 47 ~Figure 2) of plate 40, so that
they can engage the counter-contacts 4210
(Figure 3~ o~ the inserts 11 when they are
inserted.
The windows 47 for introducing the
counter contacts 4210 can have a known protection
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against electric shock hazard. ~n automatic
protection device o~ thi~ kind contains at
least one protective slide (omitted from the
drawings for simplicity) which, when an i~sert
is inserted, opens window 47 ~or counter-contact
42107 the window remains closed when the insert
is removed.
Accordingly) each assembly unit 4 can be
manuXactured by wiring in the ~actory in accordance
with the exact requirements of the partlcular tier
and can then be secured ready for use in the
cabinet by plugging contacts 420 into bars 7 and
by screwing flanges 48 (Fig~res 2 and 3 ) to parts
49 (Figure 3) o~ the cabinet~ It is the~ only
necessary to put in the inserts9 which will
immedi~tely be properly co~ected if suitably
constructed. The cabinet can then be operated
at the place of use, simply by connecting the
output lines 50
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This avoids all the complicated, risky
operatlons of wiring the plugs ~d terminals
in known ~witching systemst which are mounted
in the cabinet.
In addition to the advantage of more
efficient work and lower risk of error in
assembly at the ~actory~ there is the ad~antaga
that, in factory assembly, production means
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can be used which are unsuitable or difficult
in the case of wiring in a cabinet.
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