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AssigneeHitachi, Ltd.
InventorsKatsuhiro Komuro, Yoshitaka Kojima, Yukio Kurosawa, Yoshio Koguchi, Toru Tanimizu, Yoshimi Hakamata, Shunkichi Endo
Estimating the term…
According to the present invention there are provided a highly reliable electrode of high strength which undergoes little change even with the lapse of time, and a method for making the same, as well as a vacuum valve using such electrode and a vacuum circuit breaker using such vacuum valve. The vacuum circuit breaker has a fixed electrode and a movable electrode, each comprising an arc electrode, an arc electrode support member for supporting the arc electrode, and a coil electrode contiguous to the arc electrode support member, the arc electrode, the arc electrode support member and the coil electrode being formed as an integral structure by melting, not by bonding, particularly the arc electrode support member and the coil electrode being constituted by a Cu alloy containing 0.05-2.5% by weight of at least one of Cr, Ag, W, V and Zr.
A vacuum circuit breaker including:
A vacuum circuit breaker including:
A vacuum switch having a fixed electrode and a movable electrode within an insulating vessel held in a high vacuum, each of said electrodes comprising an arc electrode formed by a composite of a refractory metal and a highly electroconductive metal and an arc electrode support member which supports said arc electrode and which is formed of the highly electroconductive metal, said arc electrode and said arc electrode support member being formed integrally with each other by melting of the highly electroconductive metal, said fixed electrode and said movable electrode each having a plurality of grooves extending from the inside to the outside of said fixed electrode and said movable electrode at a surface opposed to one another, said grooves passing through said arc electrode and said arc electrode support member.
A vacuum switch having a fixed electrode and a movable electrode within an insulating vessel held in a high vacuum, each of said electrodes comprising an arc electrode formed by a composite of a refractory metal and a highly electroconductive metal and an arc electrode support member which supports said arc electrode and which is formed of the highly electroconductive metal, said arc electrode and said arc electrode support member being formed integrally with each other by melting of the highly electroconductive metal, said arc electrode support member having a 0.2% yield strength of not lower than 10 kg/mm2 and a specific resistance of not higher than 2.8 .mu..OMEGA.cm, said fixed electrode and said movable electrode each having a plurality of grooves extending from the inside to the outside of said fixed electrode and said movable electrode at a surface opposed to one another, said grooves passing through said arc electrode and said arc electrode support member.
An electric contact including an arc electrode formed by an alloy of a refractory metal and a highly electroconductive metal and an arc electrode support member which supports said arc electrode and which is formed of the highly electroconductive metal, said arc electrode and said arc electrode support member being formed integrally with each other by melting of the highly electroconductive metal, said electric contact having a plurality of grooves extending from an inside to an outside of the electrode at a surface opposing another electrode, said grooves passing through said arc electrode and said arc electrode support member.
An electric contact including an arc electrode formed by an alloy of a refractory metal and a highly electroconductive metal and an arc electrode support member which supports said arc electrode and which is formed of the highly electroconductive metal, said arc electrode and said arc electrode support member being formed integrally with each other by melting of the highly electroconductive metal, said arc electrode support member having a 0.2% yield strength of not lower than 10 kg/mm2 and a specific resistance of not higher than 2.8 .mu..OMEGA.cm, said electric contact having a plurality of grooves extending from an inside to an outside of the electrode at a surface opposing another electrode, said grooves passing through said arc electrode and said arc electrode support member.
A vacuum circuit breaker including:
Dependencies are inferred from the claim text.