Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1982-10-27
1987-06-16
Pellinen, A. D.
Electricity: circuit makers and breakers
Liquid contact
Time delay
H01H 3366
Patent
active
RE0324400
ABSTRACT:
[The invention disclosed a vacuum type electric circuit interrupter comprising a highly evacuated envelope which includes at least one metallic tube made of the magnetic material or the ferromagnetic material, a pair of relatively movable contacts disposed within said envelope in a location and means for eliminating the magnetodistortion of said metallic tube. This means comprises a magnetic flux generating member for supplying the magnetic flux to said metallic tube. The noise generated from the vacuum circuit interrupter is, accordingly, eliminated by means of a magnetic field applying member for applying previously the magnetic field to said metallic tube or by increasing the magnetic reluctance of the metallic tube.] A vacuum type electric circuit interrupter comprises a highly evacuated envelope including at least one metallic tube made of magnetic or ferromagnetic material and a pair of relatively movable contacts disposed within the envelope. A magnetic flux generator on the metallic tube substantially eliminates magnetostriction generated in the metallic tube by an alternating magnetic field caused by an alternating current flowing in the contacts through conductive rods. Acoustic noise is, accordingly, substantially reduced. To these ends, a magnetic field applied to the metallic tube by a magnetic flux generator has a flux density such that a portion of the metallic tube is saturated.
REFERENCES:
patent: 3071667 (1963-01-01), Lee
patent: 3372258 (1968-03-01), Porter
patent: 3920942 (1975-11-01), Yanagisawa
John Kraus, Electromagnetics, McGraw Hill, 1953, p. 166.
Hashimoto Takahumi
Innami Yoshiyuki
Ginsburg Morris
Kabushiki Kaisha Meidensha
Pellinen A. D.
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