Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1989-12-05
1991-05-14
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
H01H 3318
Patent
active
050158104
ABSTRACT:
An arc spinner interrupter includes a first fixed electrical contact and a ring electrode coupled to the fixed contact through a field coil surrounding the ring electrode. A second electrical contact has an arm which moves along a path perpendicular to the central longitudinal axis for selective connection with the fixed contact. The arm may have a generally L-shaped configuration including an angled portion that extends in a direction parallel to the central longitudinal axis and a conductor extends toward the angled portion through the ring electrode along the central longitudinal axis. The conductor has an inner axial end that is spaced slightly from the angled portion of the arm when the arm is moved to a position intersecting the central longitudinal axis so that a grading function is carried out on the electrostatic field surrounding the angled portion of the arm. This grading function serves to limit the stress exerted by the electrostatic field adjacent the angled portion of the arm section. Further, the presence of the conductor within the ring electrode reduces the wear to the angled portion by permitting transfer of an arc from the angled portion during an interruption operation such that heat from the arc is distributed in the conductor rather than in the angled portion. During movement of the second contact away from the fixed contact, electromagnetic forces are simultaneously exerted on the arc due to the general L-shape of the arm of the second contact and move the arc material both toward the ring electrode and in the direction in which the arc spins once it has commuted to the ring electrode.
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"Rotating Arc Driven by Magnetic Flux in SFG Gas", by Kazushi Fujiwara et al., presented at Second International Symposium on Switching Arc Phenomena, Lodz, Poland,-Sep. 25-27, 1973.
Eppinger David P.
Taj Hatim H.
A. B. Chance Company
Macon Robert S.
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