Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1973-12-21
1976-01-27
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200148R, 200148E, H01H 3357
Patent
active
039354083
ABSTRACT:
An improved heating means is provided for heating the gas in a high-voltage gas-type circuit-interrupter of the type utilizing an arc-extinguishing gas, which may be subject to the disadvantage of liquefaction during relatively moderate temperatures. The construction is such that primary and secondary heating means are associated with a convection chamber, the primary heating means being responsive to a probe monitoring the actual gas temperature provided within the convection chamber and maintains the gas temperature within the convection chamber to a predetermined temperature.
Preferably, a secondary heating bank is additionally provided, assuming the form, for example, of one or more separate heater elements, which are turned on and off by the external atmospheric ambient temperature.
For certain applications, the convection chamber is tilted, or slanted with respect to the arc-extinguishing assemblage, the latter extending upwardly at an angle with respect to the lower-disposed heating chamber. Thus, by the provision of a plurality of holes provided in the heating chamber, gas is encouraged to flow up the high physical side of the upstanding casing assemblage; and the cooler gas is returned down along the lower physical side of the casing assemblage for encouraging a convection flow.
Additionally, a plurality of circularly-arranged fins may be provided, affixed to the bottom of the heating chamber, for providing a greater heat surface area to the gas, and in accordance with the aforesaid convection principle, the heating fins may be disposed only at the upper physical side of the heating chamber.
REFERENCES:
patent: 3358104 (1967-12-01), Cromer
patent: 3566062 (1971-02-01), Meier et al.
patent: 3814879 (1974-06-01), Cookson et al.
R. E. Kane, Z. Neri, IEEE Transactions, Mar/Apr 71, pp. 647-651.
Crout W. R.
Macon Robert S.
Westinghouse Electric Corporation
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