Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1987-06-18
1989-08-08
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
H01H 3366
Patent
active
048555479
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a vacuum interrupter of high mechanical strength in which an arc is stably and uniformly distributed on surfaces of electrodes, and electro-magnetic repulsive force generated at the time of applying a large current is reduced.
BACKGROUND OF THE INVENTION
Usually, as shown in FIG. 1, a vacuum interrupter comprises a vacuum container (1) closed with end plates (21), (22), a pair of electrodes (30), (40) facing to each other and conductive rods (5), (6) provided through said end plates (21), (22) and in which a bellows (7) is mounted on one electrode rode (6) to be movable in the axial direction without affecting air-tightness, and said electrodes (30), (40) are relatively movable and can be brought into contact with each other. Further, a shield (8) is provided to have deposited thereupon any evaporated metals. Said conductive rod (6) is driven by a drive mechanism not shown for switching operation of an electric circuit.
In such type of vacuum interrupter, it is well known that interruption performance can be improved by stably and uniformly distributing the arc on the surfaces of the electrodes by applying a magnetic field in parallel to the arc, particularly when interrupting a large current arc. It is also known that when said electrodes (30), (40) are in a closed state, an electro-magnetic repulsive force is generated due to the large current application, and a small gap is formed between said electrodes (30), (40), thereby generating a local arc which brings about welding or deteriorates the electrode surfaces, finally lowering withstand voltage performance.
To meet the aforesaid interruption of large current arc and to reduce the electro-magnetic repulsive force when applying a large current, a further vacuum interrupter has been proposed as shown in FIG. 2(a)-(c) (Japanese laid-open Patent Publication (unexamined) No. 57-3327). FIG. 2 (a) is a side view showing an example of arrangement of electrodes in such a prior vacuum interrupter, FIG. 2 (b) is a plan view in the direction of the arrow b--b in FIG. 2 (c), and FIG. 2 (c) is a plan view in the direction of the arrow c--c in FIG. 2 (a). In these drawings, reference numerals (50), (60) designate bridge conductors respectively fixed on the ends of the conductive rods (50), (60). These bridge conductors (5), (6) are rectangular and projecting parts (51), (52), (61), (62) are respectively formed on both ends thereof. Numerals (30), (40) designate a pair of electrodes connected electrically to each bridge conductor (50), (60) on their outer peripheral back sides respectively. As shown in FIG. 2 (b), (c), circular arc-shaped grooves (33), (34), (43), (44) serving as high resistance areas are formed on each electrode (30), (40) by cutting at required distances. Thus circular arc-shaped electrode parts (31), (32) and (41), (42) serving as outside parts of the electrodes partitioned by these grooves (33), (34) and (43), (44) are formed in the electrodes (30), (40). Said bridge conductor (50) is so arranged as to cross the grooves (43), (44), and the projecting parts (51), (52) and (61), (62) are electrically and mechanically connected to substantially middle parts of said circular arc-shaped electrode parts (31), (32) and (41), (42).
Gaps between said bridge conductors (50), (60) and the electrodes (30), (40) are desired to be as small as possible, but it is necessary that the gaps are in a range in which the electrodes (30), (40) do not come in contact with the bridge conductors (50), (60) when the electrodes are butted to each other which would bring about elastic deformation due to an applied mechanical force. The aforesaid electrode (30) and the bridge conductor (50) are respectively of the same configuration as the electrode (40) and the bridge conductor (60), but the electrode (40) and the bridge conductor (60) are so arranged as to face to the electrode (30) and the bridge conductor (50) being respectively turned by 90.degree. therefrom.
According to this prior art, when an opening operation
REFERENCES:
patent: 3327081 (1967-06-01), Pflanz
patent: 4196327 (1980-04-01), Kurosawa et al.
patent: 4473731 (1984-09-01), Yorita
Hayashi Tatsuya
Toya Hideaki
Macon Robert S.
Mitsubishi Denki & Kabushiki Kaisha
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