High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum
Patent
1995-01-17
1996-05-28
Scott, J. R.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Vacuum
218120, 218139, H01H 3366
Patent
active
055213480
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a multi-pole vacuum switch having one vacuum interrupter per pole. Each vacuum interrupter has an essentially cylindrical housing and cylindrically shaped end flanges which terminate the housing axially and a connection bolt which extends through one of the end flanges and is displaceably mounted for switching the vacuum switch on and off. Each of the vacuum interrupters is surrounded by an insulation assembly. The insulation assemblies for all the poles are arranged one next to the other and include a connection chamber arranged in the axial extension of the associated vacuum interrupter. The displaceable connection bolt of the vacuum interrupter projects into the connection chamber. The connection chamber includes a loop-shaped, flexible strip conductor for connecting the displaceable connection bolt to an external connection element. A drive device, which is common to all poles, switches the vacuum interrupters on and off for all the poles. A drive lever is provided for each of the vacuum interrupters, which is pivotably mounted in the associated insulation assembly.
A vacuum switch of this kind is shown in, for example, German Patent No. DE-B-23 22 372. The insulation assemblies for the shown vacuum switch are of essentially cylindrical design and are divided transversely with respect to the longitudinal axis. The head part of each insulation assembly contains a bearing point for a two-armed lever for driving the associated vacuum interrupter. A lever part, which projects out of the head part is connected to a drive rod of the drive device. A plurality of such pole units are attached to a drive housing in accordance with the desired number of poles.
In view of German Patent No. DE-B- 23 22 372, an object of the present invention is based on simplifying the installation of the vacuum interrupters in the insulation assembly while maintaining the principle of protecting the vacuum interrupters on all sides. At the same time, it is an object of the present invention to provide conditions for largely integrating assemblies relating to the vacuum switch poles, such as connection devices, contact springs, drive components for the interrupters, or similar assemblies.
SUMMARY OF THE INVENTION
These and other objects are achieved by the vacuum switch of the present invention. The vacuum switch of the present invention is of the type described above having the following further features. Each insulation assembly comprises two shell-like insulating elements which receive the associated vacuum interrupter between them. Each insulation assembly has at least one approximately semicylindrical recess matched to one of the end flanges of the vacuum interrupter. A strip conductor is arranged in the connection chamber having legs which extend transversely with respect to the longitudinal axis of the vacuum interrupter in such a way that forces resulting from a current flowing through the strip conductor can be used to compensate contact-breaking forces within the vacuum interrupter. The insulating elements are each provided with at least two through-openings for receiving tensioning bolts which penetrate all of the insulating elements. A pole block is provided which is formed from the insulation assemblies and is arranged between side walls, which are designed to protrude beyond the pole block for attaching to the drive device.
Because of the longitudinal division of the insulation assembly, the entire current path of a pole can be installed in one of the shell-like insulating elements before the other shell-like insulating element is fitted on and an enclosed pole unit is formed. A plurality of such pole units can be joined one to the other and are then connected by tensioning bolts to form a pole block. Because of this design, the vacuum switch is divided up essentially into two large assemblies, i.e., the pole block with the protruding side walls and the drive device which is to be attached between the side walls. During the assembly of the pole block wit
REFERENCES:
patent: 3443048 (1969-05-01), Rogers et al.
patent: 3560682 (1971-02-01), Kohler et al.
patent: 3895199 (1975-07-01), Frewe et al.
patent: 4593165 (1986-06-01), Steinemer
Banghard Johannes
Berndt Klaus-Gunther
Hahn Michael
Marek Kathrina
Schmidt Detlev
Scott J. R.
Siemens Aktiengesellschaft
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