Electricity: conductors and insulators – With fluids or vacuum – Conduits – cables and conductors
Patent
1982-04-07
1986-04-08
Grimley, A. T.
Electricity: conductors and insulators
With fluids or vacuum
Conduits, cables and conductors
174 25G, 174 26G, 174DIG7, H01B 906
Patent
active
045814783
ABSTRACT:
A way to evacuate all moisture and air and then pressurize with SF.sub.6 gas, a cable and conduit system used for electrical power distribution and transmission lines, by fabricating a termination at each end. A termination is made up of a first end plate with a hole slightly larger than the conduit and sealed around the hole to the conduit. For a single phase cable, one electrical terminal is sealed as it goes through the first end plate and is connected to the neutral conductor. A second electrical terminal is sealed as it goes through a second end plate and is connected to the conductor. An enlarged conduit is spaced between these two end plates and is sealed to, the two end plates. A tire valve is installed in one end plate. A hole to fit a pipe nipple is made at the top of the enlarged conduit of one termination. A vacuum pump is connected to a pipe nipple screwed into the hole and the termination evacuated. SF.sub.6 gas is then let in through the tire valve until a pressure of 1 psig is reached, then shut off. The vacuum pump and nipple are removed, then a patch is sealed over the hole. SF.sub.6 gas is now let in to pressurize at 20-80 psig. Various numbers, sizes and kinds of conductors can be used in a conduit to make various kinds of high voltage power cables.
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Pugh Paul F.
Pugh, Jr. Paul
Grimley A. T.
Nimmo Morris H.
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