Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electrical power distribution systems and devices
Reexamination Certificate
2000-01-07
2001-05-08
Picard, Leo P. (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electrical power distribution systems and devices
C361S600000, C361S602000, C361S611000, C361S620000, C361S676000, C361S678000, C218S075000, C200S307000, C174S050510
Reexamination Certificate
active
06229690
ABSTRACT:
The present invention concerns a switchgear, particularly for medium voltage, according to the preamble of claim
1
. The invention also concerns a switchgear cubicle for use in such a switchgear.
A switchgear often comprises a plurality of switchgear cubicles. With switchgear cubicle is intended here a parallelepipedic space or room generally defined by two to four vertical and two horizontal walls, in which, in an upper portion, are mounted devices necessary for switching functions (current interruption, disconnecting and grounding) as well as measuring transformers etc., and a bar system for their interconnection, while connection of cables for incoming and outgoing current takes place in a lower portion. Thus, a complete switchgear cubicle has a certain height, defined by its fittings and its cable connection compartment.
Hitherto, switchgear cubicles have been factory completed and tested before delivery, in order to be placed directly on a switchgear flooring when being mounted in the premises of a customer. Before it has been possible to begin the very time consuming and complicated mounting of incoming and outgoing cables as well as wiring for control and surveillance systems etc., it has often been necessary to undertake adjustment of the substratum for the cubicle to stand completely horizontal. Due to the large weight of the cubicle, it has been necessary then to empty it from substantially all fittings in order to make it manageable at all. This, of course, has involved an extra cost apart from the capital cost involved in having a complete switchboard cubicle standing unused during the long duration of an installation.
It would be desirable, thus, to rationalise the manufacturing, delivery and assembly process, such that the largest possible savings in costs as well as time can be reached, and such that work, that must anyhow be performed in connection with the installation, becomes as simple and physically light as possible.
According to the present invention it is proposed, therefore, that the lower portion of a switchgear cubicle, in which connection of incoming and outgoing cables takes place, is simply removed, such that the cubicle downwardly terminates at a higher level than before. This means that connection of incoming and outgoing cables no longer takes place within the cubicle, but outside and beneath it. This, in turn, results in that bushing means for power cable connection are arranged in the now raised bottom of the cabinet, that downwardly closes the cubicle.
The main characteristics of the invention appear from the characterising part of appended claim
1
.
It is known in the art that cables asre located in a separate cell provided as a part of a switchgear cubicle, see for instance DE-43 12 621 A1. However, this separate cell is still a part of the switchgear cubicle.
The novel thinking presented by the present invention offers a row of advantages:
A substratum adapted to the cubicle can be arranged at the installation site independently of if the switchgear cubicle is delivered or not. Such a substratum may be a rack of the truss or framework kind, cantilevers protruding from a wall, or any other device keeping the cubicle at such height that connection of cables from below is possible.
Cables can be laid in advance up to the substratum and be provided with connection means fitting to connection means at the bottom of the new switchgear cubicle. Suitably, these connection means are single phase encapsulated, thus eliminating the risks of hazardous touch and electric arc. The use of connection means results in lower costs, safer and simpler assembly, and faster putting into service as soon as the cubicle has been located.
The switchgear cubicle can be factory completed during the time preparatory works at the installation site as stated above are in progress. It can be tested and delivered in a tested state, burt needs no more be dismantled at the mounting site since the substratum is prepared in advance and completely adapted to the cubicle delivered, which, thus, may be put in operation practically at once.
All high voltage parts included in the cubicle are gathered in an encapsulation so that they are inaccessible from outside. Advantageously, then, controls for connection apparatuses as well as a possible bay computer can be provided in a separate encapsulated space mounted in front of the one just mentioned.
When at least one cubicle of a row of cabinets is of a type lacking power cable connection, such cubicle may be used to accommodate a low voltage unit, e.g. a set of batteries with associated charger etc., that is suitably carried by a carriage which can be wheeled into the empty space. This is enabled owing to the space below the cubicle not being a high voltage space.
When a standardised rack is used as a substratum, several further advantages are offered:
It can suitably be sent to the installation site as a so-called flat package.
It is easy to adjust against the flooring.
It can be made in longer sections in order to support more than one cabinet.
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Arnborg Christer
Fivelstad Jan
ABB AB
Connelly Bove Lodge & Hutz LLP
Datskovsky Michael
Picard Leo P.
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