Edgar Howells

US Patent:

6037537, Mar 14, 2000

Filed:

Oct 8, 1996

Appl. No.:

8/728261

Inventors:

Charles Patrick McShane - Waukesha WI
Jerry L. Corkran - Waukesha WI
Richard A. Harthun - Burlington WI
Gary A. Gauger - Franklin WI
Kevin J. Rapp - Oak Creek WI
Edgar Howells - Greendale WI

Assignee:

Cooper Industries, Inc. - Houston TX

International Classification:

H01F 2708

US Classification:

174 17LF

Abstract:

A transformer is disclosed, including a tank housing a transformer core/coil assembly, a dielectric insulating fluid surrounding the core/coil assembly, the fluid comprising a vegetable oil, an antioxidant dissolved in the oil, and a low temperature additive blended into the oil, wherein the fluid defines a headspace above the fluid. The preferred embodiment includes an oxygen absorbing material contained in the tank and in contact with gases in the tank but isolated from contact with the dielectric fluid, the tank including an opening and a sealed plug in the opening, such that the oxygen absorbing material can be replaced through the opening upon removal of the sealed plug, and further includes a gas permeable polymer container sealed against the opening for supporting the oxygen absorbing material and an indicator in gas contact with the headspace and visible from outside the tank for indicating the presence of oxygen in the headspace.

US Patent:

61844594, Feb 6, 2001

Filed:

Mar 25, 1999

Appl. No.:

9/276191

Inventors:

Charles Patrick McShane - Waukesha WI
Jerry L. Corkran - Waukesha WI
Richard A. Harthun - Burlington WI
Gary A. Gauger - Franklin WI
Kevin J. Rapp - Oak Creek WI
Edgar Howells - Greendale WI

Assignee:

Cooper Industries Inc. - Houston TX

International Classification:

H01F 2708

US Classification:

174 17LF

Abstract:

A transformer is disclosed, including a tank housing a transformer core/coil assembly, a dielectric insulating fluid surrounding the core/coil assembly, the fluid comprising a vegetable oil, an antioxidant dissolved in the oil, and a low temperature additive blended into the oil, wherein the fluid defines a headspace above the fluid. The preferred embodiment includes an oxygen absorbing material contained in the tank and in contact with gases in the tank but isolated from contact with the dielectric fluid, the tank including an opening and a sealed plug in the opening, such that the oxygen absorbing material can be replaced through the opening upon removal of the sealed plug, and further includes a gas permeable polymer container sealed against the opening for supporting the oxygen absorbing material and an indicator in gas contact with the headspace and visible from outside the tank for indicating the presence of oxygen in the headspace.