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US 4,291,192 AGranted
Venting apparatus for an electric cable pothead
AssigneeConsolidated Edison Company of New York, Inc.
InventorsThomas F. Eccleston, Walter M. Wilson
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AssigneeConsolidated Edison Company of New York, Inc.
InventorsThomas F. Eccleston, Walter M. Wilson
Estimating the term…
A pothead installation for a high voltage, high pressure oil-filled, electric cable in which the pothead is surrounded by a metal tank at ground potential, the tank being filled with sulfur hexafluoride gas under pressure. Oil and nitrogen within the pothead are conveyed to the exterior of the tank by a tube of insulating material having electrical characteristics and a length adequate to withstand at least the voltage difference between the cable conductor and the tank and having physical characteristics adequate to withstand at least the pressures of the oil and nitrogen. At the end of the tube at the tank wall, the tube is connected to a reservoir which is mounted exteriorly of the tank and which accumulates the oil and nitrogen. The reservoir has a venting valve for venting the nitrogen and oil, has a sight gauge for monitoring the oil level in the reservoir, and may have a float switch connected thereto for operating an alarm when the volume of the nitrogen exceeds a predetermined value.
In combination with a housing enclosing a portion of an electrical cable which operates at a predetermined voltage which is different from the voltage of said housing, said cable having fluid under pressure above atmospheric pressure therein, venting means for venting fluid from said cable exteriorly of said housing, said venting means comprising a tube of insulating material connected in fluid communication with a portion of said cable at said predetermined voltage and extending to at least a wall of said housing for conveying fluid out of said cable and to the outside of said housing, a closed reservoir externally of said housing and connected to said tube for receiving fluid from said cable, and means connected to said reservoir for venting said fluid from said reservoir, said tube having a length and being made of an insulating material which has physical and electrical properties which will withstand the pressure of said fluid and withstand said voltage without breakdown.
In combination with electrical apparatus comprising a conductor enclosed by a sealed enclosure, said conductor operating at a predetermined voltage with respect to ground potential and said conductor having insulating fluids under above atmospheric pressure therearound, venting means for removing said fluids from adjacent said conductor to a point at lower potential, said venting means comprising a sealed reservoir spaced from said conductor and outside of said enclosure, said reservoir being at said lower potential, a tube of insulating material in fluid communication at one end with the fluids around said conductor and connected at its opposite end to said reservoir for conveying said fluids into said reservoir, and means for removing said fluids from said reservoir, said tube having a length and being made of an insulating material which has physical and electrical properties which will withstand the pressure of said fluid and the potential difference between said voltage and said lower potential without breakdown.
Dependencies are inferred from the claim text.