Transformer having improved heat dissipating system

Claim 2

In an electrical transformer, the combination of: a hollow metallic casing mounted on a the horizontal surface of a level concrete ground pad, a non-volatile cooling and insulating liquid within said casing, a transformer core and coil assembly immersed in said liquid within said casing, a metallic cover closing said casing and being spaced from the top surface of said liquid to provide a gas cushion within said casing above said liquid and beneath said cover, and at least one elongated, vertical heat transfer fin having a high thermal conductivity relative to the gas in said cushion affixed to and extending a substantial distance along the inner surface of said cover and depending through said gas cushion and having its end immersed in said liquid, whereby heat is transmitted from said liquid through said heat transfer member to said cover and the heat dissipation from the top surface of said cover to the atmosphere is increased.

Claim 3

In an electrical transformer having a casing provided with a compartment containing a non-volatile cooling and insulating liquid, a level concrete ground pad having a horizontal upper surface on which said casing is mounted, a transformer core and coil assembly immersed in said liquid within said compartment, a metallic cover closing said compartment and being spaced above the top surface of said liquid, and a gas cushion within said compartment above the top surface of said liquid and below said cover, the improvement comprising a plurality of elongated, vertical heat transfer metallIc fins affixed in spaced apart relation to and extending a substantial distance along the inner surface of said cover and depending through said gas cushion with their ends immersed in said liquid, whereby heat is transmitted from said liquid through said metallic fins to said cover and the heat dissipation from the top surface of said cover to the atmosphere is increased.

Claim 4

In an electrical transformer having a casing provided with a compartment containing a non-volatile cooling and insulating liquid, a level concrete ground pad having a horizontal upper surface on which said casing is mounted, a transformer core and coil assembly immersed in said liquid within said compartment, a metallic cover closing said compartment and being spaced above the top surface of said liquid, and a gas cushion within said compartment above the top surface of said liquid and below said cover, the improvement comprising a plurality of elongated, vertical heat transfer metallIc fins affixed in spaced apart relation to and extending a substantial distance along the inner surface of said cover and depending through said gas cushion with their ends immersed in said liquid, whereby heat is transmitted from said liquid through said metallic fins to said cover and the heat dissipation from the top surface of said cover to the atmosphere is increased.

Claim 5

In an electrical transformer in accordance with claim 2 wherein said fins are elongated channels having the web thereof affixed to the inner surface of said cover and the legs thereof depending through said gas cushion with the ends of said legs immersed in said liquid.

Claim 6

In a pad-mounted electrical transformer having a metallic casing with an oil compartment therein, a level concrete ground pad having a horizontal upper surface on which said casing is mounted, transformer oil in said compartment, a transformer core and coil assembly immersed in said oil, a metallic cover closing said compartment and being spaced above the top surface of said transformer oil, a gas cushion within said compartment above said oil and beneath said cover, and a plurality of elongated vertical metallic heat transfer fins affixed in spaced apart relation to and extending a substantial distance along the undersurface of said cover and depending from said cover through said gas cushion with their ends immersed in said liquid, whereby heat is transmitted from said transformer oil through said heat transfer fins to said cover and the heat dissipation from the top surface of said cover to the atmosphere is increased.

Claim 7

In a pad-mounted electrical transformer having a metallic casing with an oil compartment therein, a level concrete ground pad having a horizontal upper surface on which said casing is mounted, transformer oil in said compartment, a transformer core and coil assembly immersed in said oil, a metallic cover closing said compartment and being spaced above the top surface of said transformer oil, a gas cushion within said compartment above said oil and beneath said cover, and a plurality of elongated vertical metallic heat transfer fins affixed in spaced apart relation to and extending a substantial distance along the undersurface of said cover and depending from said cover through said gas cushion with their ends immersed in said liquid, whereby heat is transmitted from said transformer oil through said heat transfer fins to said cover and the heat dissipation from the top surface of said cover to the atmosphere is increased.