Impregnation and encapsulating material
AssigneeAerovox Incorporated
InventorJeffrey A. Bentley
Life of this patent
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Abstract
A capacitor in which the capacitive element is impregnated and encapsulated by a composition having a softening point above the normal operating temperature of the capacitor and below the temperature that would occur following a failure of the capacitive element (or in another aspect below the temperature at which the polypropylene film of a polypropylene film capacitor shrinks). In other aspects the composition is a blend of polybutene and polyethylene; and a method of impregnating a capacitor is provided.
Claims21
A capacitor comprising
- a capacitive element,
- a dielectric impregnating composition impregnating said element and having a softening point above the normal operating temperature of said capacitor and below the temperature that would occur following a failure of said capacitive element, the softening of said composition during failure of said capacitive element aiding the release of gases, and
- means for disconnecting said capacitor after it begins to fail, said disconnecting being aided by said release of gases.
A capacitor comprising
- a capacitive element comprising a polypropylene film, and
- a dielectric impregnating composition impregnating said capacitve element and having a softening point above the normal operating temperature of said capacitor, and below the termperature at which said film shrinks.
A capacitor comprising
- a capacitive element including a dielectric sheet, and
- a dielectric impregnating composition impregnating said element and comprising a blend of polybutene and polyethylene.
A method of impregnating and encapsulating a capacitor, said method comprising
- providing said capacitor with a capacitive element comprising a polypropylene film,
- providing a composition having a softening point above the normal operating temperature of said capacitor and below the temperature at which said film shrinks,
- softening said composition,
- impregnating said capacitor with said composition, and
- cooling said capacitor below said softening point.
A capacitor comprising
- a capacitive element, and
- a dielectric composition encapsulating said capacitive element and comprising a blend of polybutene and polyethylene.
A method of aiding the disconnection of a capacitor, said method comprising
- providing a capacitor having a capacitive element impregnated with a dielectric impregnating composition having a softening point above the normal operating temperature of said capacitor and below the temperature that would occur during a failure of said capacitive element, and means for disconnecting said capacitor after it begins to fail,
- aging said capacitor until it begins to fail, the failure of said capacitor causing the temperature of said capacitor to increase to above the normal operating temperature of said capacitor, said increases in temperature resulting in the softening of said composition, assisting in the release of gases that aid in said disconnecting.
Dependencies are inferred from the claim text.