Back to results
US 4,330,681 AGranted
Fluid-filled electric cable joints and terminations with filtering means
AssigneeBICC Limited
InventorBrian Gregory
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeBICC Limited
InventorBrian Gregory
Estimating the term…
Risk that metal particles carried by flowing oil in an oil-filled cable joint or termination will settle along an oil path between a cable conductor and the space bounded by the joint or termination enclosure is substantially reduced by making at least part, and preferably the whole, of the boundary wall of the path of a fibrous insulating material, e.g., paper, and by providing, at at least one end of the path, for filtering from flowing oil particles of metal and other undesirable materials that may be carried by the oil, filtering means comprising, in combination, electrically insulating filtering material and a fine metallic mesh, serving as an electrical screen. Fibres of the boundary wall so formed protrude into the path and restrict mobility of metal particles carried by the flowing oil; some metal particles will penetrate the fibrous insulating material which will also absorb from the oil some types of dissolved contamination, e.g., moisture. The oil path may extend through a body of fibrous insulating material built up around the conductor joint or termination or, over at least a part of its length, it may be formed between such a body of fibrous insulating material and a preformed body of cast resin.
A fluid-filled electric cable joint in which the jointed cable conductors are housed in a joint enclosure, in which the dielectric of each cable conductor connected at the joint includes a dielectric fluid which is free to flow along the cable conductor and the insulation of each cable conductor at the joint is a laminated body of helically lapped tapes of insulating material, and in which at least one path is provided for free flow of the dielectric fluid from each cable conductor into the shape bounded by the joint enclosure or vice versa, wherein each said path is defined by a boundary wall of which at least a part, extending between the cable conductor and said space, is of a fibrous insulating material, and filtering means provided at at least one end of each said path, for filtering from the flowing dielectric fluid particles of metal and other undesirable materials that may be carried by the fluid, said filtering means comprising, in combination, electrically insulating filtering material and a fine metallic mesh, serving as an electrical screen.
A fluid-filled electric cable joint in which the jointed cable conductors are housed in a joint enclosure, in which the dielectric of each cable conductor connected at the joint includes a dielectric fluid which is free to flow along the cable conductor and the insulation of each cable conductor at the joint is a laminated body of helically lapped tapes of insulating material, and in which at least one path is provided for free flow of the dielectric fluid from each cable conductor into the space bounded by the joint enclosure or vice versa, wherein each said path is defined by a boundary wall which extends between the cable conductor and said space and which is made substantially wholly of a fibrous insulating material, and filtering means provided at at least one end of each said path, for filtering from the flowing dielectric fluid particles of metal and other undesirable materials that may be carried by the fluid, said filtering means comprising, in combination, electrically insulating filtering material and a fine metallic mesh, serving as an electrical screen.
A fluid-filled electric cable termination in which the terminated cable conductor is housed in a termination enclosure, in which the dielectric of the cable conductor terminated at the termination includes a dielectric fluid which is free to flow along the cable conductor and the insulation of the cable conductor at the termination is a laminated body of helically lapped tapes of insulating material, and in which at least one path is provided for free flow of the dielectric fluid from the cable conductor into the space bounded by the termination enclosure or vice versa, wherein the said path is defined by a boundary wall of which at least a part, extending between the cable conductor and said space, is of a fibrous insulating material, and filtering means provided at at least one end of each said path, for filtering from the flowing dielectric fluid particles of metal and other undesirable materials that may be carried by the fluid, said filtering means comprising, in combination, electrically insulating filtering material and a fine metallic mesh, serving as an electrical screen.
Dependencies are inferred from the claim text.