High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum
Patent
1995-05-04
1997-09-16
Gellner, Michael L.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Vacuum
218123, H01H 3366
Patent
active
056683618
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a vacuum contactor. More particularly, the invention relates to a vacuum contactor having at least one vacuum interrupter and a chamber open on one side for accommodating the insulator body which contains the vacuum interrupter, an upper and a lower connection terminal arranged on the insulator body as a connection between the vacuum interrupter and an external electric circuit, each of these connection terminals being secured to opposite wall parts of the insulator body, and having a connector contact face for an external conductor.
A vacuum contactor of this type is shown in the German company publication by Siemens entitled Vakuumhochspannungsschutze 3TL6 (High-Voltage Vacuum Contactors 3TL6), edition 1988, order No. E86010-K1802-A201-A1. It discloses connection terminals made of metal structural parts, which are used for both the current transfer and as means for mounting on the insulator body. An object of the present invention is to improve reliability in the protection against partial discharges and breakdowns in the area of the connection terminals.
SUMMARY OF THE INVENTION
This objective is solved in accordance with the invention in that the connector contact face of at least the upper connection terminal is a component of a metal member that is dimensioned essentially only as a function of a current to be carried and a holder made of insulating material to be joined to the wall parts of the insulator body is used to secure the metal member. In this manner, the high-voltage potential is kept further away from the grounded components than had been possible using existing structural parts of metal. Because of the increased distance, the electric field strength is reduced at critical points, so that the reliability with respect to protecting against breakdowns or partial discharges is improved. Although it is possible in principle to design both the upper as well as the lower connection terminal in the indicated manner, it is typically sufficient to only alter the upper connection terminal accordingly. Because of its increased dielectric strength, the vacuum contactor can be used in the case of unaltered dimensions for higher nominal voltages than had previously been possible.
The invention advantageously makes it possible for the partial area of the connection terminals used for current conduction to be simpler in design than in known methods. In particular, the metal member can have a rectangular cross-section and, the holder has a recess adapted to the cross-sectional shape of the metal member. Thus, the recess assumes the function of mutually aligning the metal member and the holder. For example, the metal member can be a mounting channel that is straight or right-angled at the end, or a cast part of copper with suitable surface protection.
The holder can have projections that protrude in the direction of the narrow sides of the metal member. In this case, the projections take over the task of aligning the metal member, while the remaining boundary surfaces of the recess of the holder can have a certain angle of inclination to facilitate manufacturing.
In addition, it is recommended that the holder have a stop face to delimit the recess in its longitudinal direction, as well as a cut-away opening for a fastening element that joins the metal member and the holder. Therefore, when joining together the metal member and the holder, both parts are positioned to align the cut-away opening of the holder with a corresponding cut-away opening in the metal member. This makes it possible for a clamping screw to be inserted to join together the metal member, the holder and a flexible conductor that is provided as a movable connection between the connection terminal and the movable terminal stud of the vacuum interrupter.
As with the connection terminals which are made entirely of metal, the holder which is made of insulating material for the upper connection terminal can have a fork-like design and can have two lateral sides to be joined to the opposit
REFERENCES:
patent: 3190992 (1965-06-01), Digby
patent: 3784774 (1974-01-01), Wilson
patent: 4434331 (1984-02-01), Sakuma et al.
patent: 4621175 (1986-11-01), Volkmar
Siemens Publication "Vakuum-Hochspannungsschutze 3TL6" (1988), Order No. E86010-K1802-A201-A1.
Moncke Hartmut
Traore Ibrahim
Friedhofer Michael A.
Gellner Michael L.
Siemens Aktiengesellschaft
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