EP0113962A1
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EP
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Vacuum interrupter
Assignee: Meidensha Corp
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Filing: 1983-11-29
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Granted: —
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Expires: 2003-11-29
Abstract
Abstract A vacuum interrupter which enhances current interruption capability for large current of high voltage. The interrupter includes a vacuum envelope (23), a pair of lead rods which are relatively coaxially movable extending into the envelope from the outside, a pair of contact-electrodes (28, 38) each mechanically and electrically connected to the inner ends of the lead rods; at least one of the contact-electrodes being made of material of at most 40% IACS electrical conductivity and a coil-electrode (29), which is made of material of electrical conductivity higher than that of contact-electrode and all the portions of which are mechanically and electrically joined to a back-surface of the contact-electrode, applying an axial magnetic field parallel to arc current across an interelectrode gap. Current paths are shortened in the contact-electrode. Currents which reduce the axial magnetic field and impair uniformity of the magnetic flux density are reduced. A direct joining of the contact-electrode and the coil-electrode allows the interelectrode gap to be increased.
Inventors
- 👤 Yasushi Noda
- 👤 Yoshiyuki Kashiwagi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 02:24
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/664; H01H33/6644
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
117 words
A vacuum interrupter comprising: - a vacuum envelope which is generally electrically insulating; a pair of lead rods which are relatively coaxially movable extending into said vacuum envelope from the outside thereof, a pair of contact-electrodes each mechanically and electrically connected to the inner ends of said lead rods; at least one of said contact-electrodes being made of material of at most 40% IACS electrical conductivity and, a coil-electrode which is made of material of electrical conductivity higher than that of contact-electrode and all the portions of which are mechanically and. electrically joined to a backsurface of the contact-electrode, applying an axial magnetic field in a direction substantially parallel to arc current flowing across an interelectrode gap.
Claim 2
Dependent Claim
117 words
A vacuum interrupter comprising: - a vacuum envelope which is generally electrically insulating; a pair of lead rods which are relatively coaxially movable extending into said vacuum envelope from the outside thereof, a pair of contact-electrodes each mechanically and electrically connected to the inner ends of said lead rods; at least one of said contact-electrodes being made of material of at most 40% IACS electrical conductivity and, a coil-electrode which is made of material of electrical conductivity higher than that of contact-electrode and all the portions of which are mechanically and. electrically joined to a backsurface of the contact-electrode, applying an axial magnetic field in a direction substantially parallel to arc current flowing across an interelectrode gap.
Claim 3
Dependent Claim
44 words
A vacuum interrupter defined in claim 1, wherein said coil-electrode is generally disc-shaped and includes a radially extending web from the center of said coil-electrode and a turning segment of a generally annular form extending from an outer end of the radially extending web.
Claim 4
Dependent Claim
70 words
.3. A vacuum interrupter defined in claim 1, wherein said coil-electrode is generally disc-shaped and includes a plurality of radially extending webs from the center of said coil electrode and a plurality of partially turning segments each extending substantially in the same circumferential direction from the outer ends of the radially extending webs, and angular gaps are defined between adjacent ends of the partially turning segments and radially extending webs.
Claim 5
Dependent Claim
40 words
4 . A vacuum interrupter defined in claim 3, wherein said at least one contact-electrode is generally continuous and a length of the partially turning segment is determined at most 75% of a circumferential length between adjacent radially extending webs.
Claim 6
Dependent Claim
31 words
5 . A vacuum interrupter defined in claim 4, wherein said length of the partially turning segment is determined about 67% of the circumferential length between the adjacent radially extending webs.
Claim 7
Dependent Claim
21 words
A vacuum interrupter defined in claim 3, wherein a backsurface of said contact-electrode includes a recess corresponding to the angular gap.
Claim 8
Dependent Claim
22 words
A vacuum interrupter defined in claim 6, a length of said recess is at least 20% of a diameter of the contact-electrode.
Claim 9
Dependent Claim
18 words
A vacuum interrupter defined in claim 3, wherein said contact-electrode includes a slit corresponding to the angular gap.
Claim 10
Dependent Claim
24 words
A vacuum interrupter defined in claim 8, wherein a length of said slit is at least 2 0% of a diameter of the contact-electrode.
Claim 11
Dependent Claim
25 words
A vacuum interrupter defined in any preceding claim, wherein said at least one contact-electrode is made of material of at most 20% IACS electrical conductivity.
Claim 12
Dependent Claim
27 words
A vacuum interrupter in any of claims 1 to 9 wherein said at least one contact-electrode is made of material of at most 10% IACS electrical conductivity.
Claim 13
Dependent Claim
26 words
any of to 9, 12. A vacuum interrupter in claims 1 wherein said at least one contact-electrode is made of material of 2% IACS electrical conductivity.
Claim 14
Dependent Claim
26 words
any preceding 13. A vacuum interrupter inlclaim, wherein said at least one contact-electrode is made of Be, Cu-W alloy, Ag-W alloy, Cu-Cr-Mo alloy or Fe-Ni-Cr alloy.
Claim 15
Dependent Claim
19 words
any preceding 14. A vacuum interrupter in claim, wherein said contact-electrode includes a plannar contact-making portion at the center.
Claim 16
Dependent Claim
17 words
A vacuum interrupter in claim 14, wherein said planner contact-making portions includes a recess at the center.
Claim 17
Dependent Claim
52 words
A vacuum interrupter in claim 3, further comprising: a second coil-electrode spaced from the first coil-electrode therebehind, applying the axial magnetic field in conjunction with the first coil-electrode and being electrically connected at the center to said lead rod while at the circumference to the partially turing segments of the first coil-electrode.
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