High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum
Patent
1993-11-22
1995-08-01
Scott, J. R.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Vacuum
H01H 3366
Patent
active
054381746
ABSTRACT:
A vacuum interrupter with an enhanced radial magnetic field includes within a vacuum envelope a pair of confronting contacts that are relatively movable between an open circuit and a closed circuit position. The contacts, which can be the spiral-arm type or the slotted-cup type, are surrounded by a tubular metal vapor shield that is electrically isolated from at least one of the contacts in the open circuit position. Each contact is connected in series with a coil energized by the current in the interrupter and positioned proximate the non-confronting face of the contact, and with a current carrying terminal post extending outside the vacuum envelope. The current in the coils produces a radial magnetic field in the intercontact region that encourages a columnar arc between the contacts to move outward and attach to the vapor shield. This helps to promote a transition to a diffuse type of arc and allows for a more compact interrupter with greater interruption capability. The radial magnetic field can also be enhanced by using a contact design having elongated spiral-shaped arms that each extend more than 180.degree. around the contact. The elongated spiral-arm contacts can be used in conjunction with the coil structure or used alone to produce the enhanced radial magnetic field. The vapor shield is fabricated of a thick layer of a Cu--Cr metal mixture, or of a high permeability material.
REFERENCES:
patent: 3612795 (1971-10-01), Emmerich
patent: 3851203 (1974-11-01), Harris
patent: 3935406 (1976-01-01), Murano et al.
patent: 3946179 (1976-03-01), Murano et al.
patent: 4196327 (1980-04-01), Kurosawa et al.
patent: 4210790 (1980-07-01), Kurosawa et al.
patent: 4547640 (1985-10-01), Kashiwagi et al.
patent: 4553007 (1985-11-01), Wayland
patent: 4727228 (1988-02-01), Hoene et al.
Paul G. Slade, "The Vacuum Interrupter Contact," Mar., 1984 IEEE Tran. Comp. Hybrids Package, vol. CHMT-7, pp. 25-32.
Schulman, M. B. and Bindas, J. A., "Evaluation of AC Axial Magnetic Fields Needed to Prevent Anode Spots in Vacuum Arcs Betweem Opening Contacts," Sep., 1993, Proc. 39th IEEE Conf. on Electric Contacts.
Eaton Corporation
Moran Martin J.
Scott J. R.
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