High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Multiple break
Patent
1997-08-22
1999-02-16
Coggins, Wynn Wood
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Multiple break
218 45, 218 79, 218 80, H01H 3314, H01H 3318, H01H 3370
Patent
active
058723463
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a high-voltage metal-cladded switchgear.
BACKGROUND INFORMATION
German Published Patent Application No. 21 46 625 and German Patent No. A-20 03 076 describe high-voltage metal-cladded switchgears in which the power switch and the respective busbar are insulated from the isolating switches when the isolating switches are in isolation mode. Closing an isolating switch establishes a conducting connection with the power switch as well as the respective busbar conductor in a relatively complicated manner. The potential of the isolating switches is indeterminate in isolation mode. This can lead to sparkover.
Furthermore, the isolating switches, which have a few moving parts, are susceptible to problems and it is impossible to guarantee with certainty that both isolating switches are always connected to the power switch.
A similar high-voltage switchgear is known from European Patent No. 0 348 313, for example. With the known switchgear, two busbars are provided with isolating switches whose terminals project into the gas space of a power switch, where they are connected using a connecting conductor. The power switch is connected to the connecting conductor.
With this embodiment, assembly and dismantling are very tedious, because the connecting conductor must be connected to the terminals of the isolating switches or disconnected from them again.
European Patent No. A-0 152 611 describes a high-voltage switchgear with a power switch that can also be connected to two isolating switches.
The power switch described there, however, cannot easily be removed from its enclosure, which is separated from the enclosure of the isolating switches and the busbars, without opening the isolating switch enclosure. To remove the power switch, part of its enclosure must also be removed.
The European Patent No. A-0 152 611 also describes a plug-and-socket connection for contacting an isolating switch that is in the gas space of the isolating switches there, which results in the fact that the enclosure of the power switch must be removed to separate the connection between the power switch and one isolating switch.
SUMMARY OF THE INVENTION
The present invention relates to a high-voltage metal-cladded switchgear having two busbars and a power switch to whose first end there are connected the terminals of two isolating switches, one of which connects the power switch to one busbar conductor at a time in the ON state and having a cladding for the power switch in which the terminals of the isolating switches are arranged separately, where one contact point is non-detachably connected to the first end of the power switch and can be removed together with the power switch from the enclosure and has at least two contact devices for electrically connecting the power switch to one isolating switch at a time. The contact devices together with the terminals of the isolating switches form plug-and-socket connections inside the enclosure.
An object of the present invention is to provide a high-voltage metal-cladded switchgear so as to facilitate both assembly and maintenance and simplify the design of the isolating switches and the electric connections.
The aforementioned object is achieved by the fact that the plug-and-socket connections have immovable contact points on the isolating switch side into which corresponding mating contact points can be inserted in the axial direction in assembly by axial insertion of the power switch into the enclosure.
The device of the present invention ensures that when installing the power switch in the enclosure, the first end of the switch will be non-detachably connected to the terminals of the isolating switches without requiring any additional assembly work. No separate connector is needed for connecting the terminals of the two isolating switches. The electrical connection between the power switch and the isolating switches is advantageously established simply by inserting the power switch into the enclosure. There cannot be any assembly errors
REFERENCES:
patent: 3665257 (1972-05-01), De Heus
patent: 5578805 (1996-11-01), Berger et al.
patent: 5589674 (1996-12-01), Berger et al.
Kelch Thomas
Meinherz Manfred
Coggins Wynn Wood
Hayes Michael J.
Siemens Aktiengesellschaft
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