Oil-filled electric cable installations comprising pressurizing oil tanks
AssigneeBICC Limited
InventorsDerek R. Edwards, Cyril H. Gosling
Life of this patent
Estimating the term…
Abstract
An oil-filled electric cable installation, in which oil when flowing outwardly from the cable to a pressure-maintaining oil tank it passes through a percolating filter, preferably of an active material, to remove particulate and/or dissolved impurities. A one-way return passage bypasses the filter so that maintenance of pressure is not impaired, and if required a high-pressure bypass may be used to protect the filter from unusually high pressures.
Claims4
An oil-filled electric cable installation comprising (i) at least one cable comprising at least one metallic conductor, insulation surrounding the conductor, an enclosing fluid-tight sheath and at least one oil duct extending from end to end of the cable inside the sheath, the cable comprising a plurality of sections defined by stop-joints (ii) oil tanks for maintaining the cable sections filled with oil under pressure and (iii) oil ducts connecting said oil tanks to the stop-joints wherein:
- at least one said oil duct comprises two passages in parallel;
- the first passage provides a percolating filter through which oil normally flows when passing from the cable to the tank;
- and the second passage contains a one-way valve permitting flow of oil from the tank to limit the extent to which the oil pressure in the cable can fall below that in the tank.
Dependencies are inferred from the claim text.