Electricity: circuit makers and breakers – Electric switch details – Cases and bases
Patent
1976-08-30
1978-08-01
Tudor, Harold
Electricity: circuit makers and breakers
Electric switch details
Cases and bases
174142, 174DIG11, 200144C, H01H 902
Patent
active
041044975
ABSTRACT:
This disconnect contact assembly comprises a tubular insulator projecting forwardly through a grounded metal plate and surrounding the usual bridging contact subassembly. A current transformer secondary assembly surrounds the tubular insulator. Two separate metallic coatings are provided on the tubular insulator, the first one on the outer peripheral surface of the insulator and the second one on the inner peripheral surface of the insulator. The first metallic coating is normally at ground potential and the second one is normally at the potential of said bridging contact subassembly. In addition, two semiconductor coatings, each having non-linear resistivity properties, are provided on the tubular insulator. The first semiconductor coating is disposed on the external surface of the tubular insulator at the forward end of said first metallic coating. The second semiconductor coating is disposed on the internal surface of the tubular insulator at the forward end of said second metallic coating.
The two metallic coatings act to confine the electric stress in the region of the current transformer secondary and the bridging contact subassembly to the solid dielectric material of the tubular insulator, and the two semiconductor coatings act to grade the electric stresses at the forward ends of the metallic coatings where the equipotential lines of the electric field emerge from said dielectric material.
REFERENCES:
patent: 2082055 (1937-06-01), Higgins
patent: 3210460 (1965-10-01), Park
patent: 3210460 (1965-10-01), Suelmann
patent: 3210461 (1965-10-01), Berg et al.
patent: 3397293 (1968-08-01), Darrow et al.
patent: 3398348 (1966-08-01), Kilgore
patent: 3646251 (1968-08-01), Friedrich
Freedman William
General Electric Company
Tudor Harold
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