High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum
Patent
1997-06-23
2000-06-06
Stright, Ronald
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Vacuum
218123, 218128, H01H 3366
Patent
active
060721413
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a structure of contacts for use in vacuum type circuit-breakers generating in the current carrying state on axial magnetic field for the interruption of an arc when established between the separating contacts during an opening operation of the vacuum circuit-breaker. In the closed state of the vacuum circuit-breaker the contacts carry currents of different values under specified conditions.
DESCRIPTION OF THE PRIOR ART
A contact arrangement of the presupposed type is known from DE 32 27 482 A1. In this case, inclined gaps in the wall part of the cup-shaped contact makers generate winding elements that are inclined toward the contact maker axis, and these winding elements generate an axial magnetic field when current flows through them. The gaps in the wall part can continue in the bottom part of the contact maker. The disadvantage of this contact arrangement lies in the slant for the winding elements, because only their azimuthal components contribute to generating the axial magnetic field when current flows through.
Another contact arrangement of the presupposed type is described in EP 0 133 368 A3. In this case as well, axially inclined gaps are arranged in the wall part of a cup-shaped contact maker, which continues in the same plane in the bottom part. The gap region in the bottom part follows the course of a chord. With this gap arrangement, the current flows in the contact maker arc to receive a considerable tangential component, so that an electric arc developing between the opening contacts is caused to rotate immediately on the front of the wall part. Thus, a radial magnetic field is obviously generated in the gap length by two axially facing contact makers. This does not contribute to an improved generating of an axial magnetic field.
SUMMARY OF THE INVENTION
It is the object of the invention to create a winding arrange ent with considerably higher efficiency for generating an axial magnetic field, as compared to the Prior Art, so that a contact arrangement thus equipped will achieve a considerably higher short-circuit breaking power.
The invention is based on the realization that with the known contact arrangements that generate a magnetic field, the cup shape used is utilized only in part for forming ring-segment shaped winding elements. In the sequence of the ideas, the essential part of the invention consists first using the cup bottom and then, if necessary, also the cup wall as support for ring-segment shaped winding elements. Partial ring-shaped gaps arranged in the cup bottom are used for this. Second gaps adjoin the ends of the first winding-producing first gaps that run in the bottom which limit the winding elements in azimuthal direction while running in the cup wall essentially facing the contact and electrodes.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained below in more detail with the aid of drawings of exemplary embodiments in FIGS. 1 to 38 in which:
FIG. 1 is a longitudinal sectional view of a contact, showing a radial, graduated radial cup-wall gap or one that runs along a screw-type cutting surface;
FIG. 2 is a plan view of the contact according to FIG. 1, without contact disk;
FIG. 3 is an elevational view of the complete contact according to FIG. 1;
FIG. 4 is a plan view of the contact according to FIG. 3;
FIG. 5 is a longitudinal sectional view of a contact with slots in the wall portion inclined toward the contact axis;
FIG. 6 is a plan view of the contact according to FIG. 5, without contact disk;
FIG. 7 is an elevational view of the complete contact according to FIG. 5;
FIG. 8 is a plan view of the contact according to FIG. 7;
FIG. 9 is a longitudinal sectional view of a contact with tangential cup wall gaps;
FIG. 10 is a plan view of the contact according to FIG. 9;
FIG. 11 is an elevational view of the complete contact according to FIG. 9;
FIG. 12 is a plan view of the contact according to FIG. 11;
FIG. 13 is a partial sectional view of a contact with the contact and electrode element r
REFERENCES:
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patent: 4293748 (1981-10-01), Sakuma et al.
patent: 4445015 (1984-04-01), Zueckler
patent: 4698467 (1987-10-01), Kaneko et al.
patent: 4704506 (1987-11-01), Kurosawa et al.
patent: 5055639 (1991-10-01), Schels et al.
patent: 5099093 (1992-03-01), Schels et al.
Kaneko, E. Tamagawa, T. et al., "Recent Investigations and Developments of Vacuum Circuit Breakers in Japan", e&i, 107Jg., 1990, H.3, pp. 127-133.
Hayes Michael J.
Spencer George H.
Stright Ronald
Voorhees Catherine M.
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