Electricity: conductors and insulators – With fluids or vacuum – With fluid maintenance or conditioning means
Patent
1989-07-18
1990-08-21
Cintins, Ivars
Electricity: conductors and insulators
With fluids or vacuum
With fluid maintenance or conditioning means
210690, 210909, 336 58, B01D 1500
Patent
active
049508377
ABSTRACT:
The present invention is directed to a method for reducing PCB concentration in an electrical induction apparatus containing a dielectric fluid with greater than 500 ppm PCB to a level of less than about 50 ppm PCB. Dielectric fluid containing greater than 500 ppm PCB is drained from an electrical induction apparatus, and the drained apparatus then is filled with tetrachloroethylene as a first interim dielectric fluid. The apparatus is then electrically operated with the first interim dielectric fluid so as to attain about an equilibrium PCB concentration in the first fluid. The first interim dielectric fluid then is drained from the apparatus and replaced with fresh tetrachloroethylene as a second interim dielectric fluid. The apparatus then is electrically operated with the second interim dielectric fluid so as to attain about an equilibrium PCB concentration in the second fluid. The second interim dielectric fluid then is drained from the apparatus and replaced with a silicone fluid as a permanent dielectric fluid. The apparatus filled with permanent dielectric fluid is electrically operated and the permanent dielectric fluid is filtered through a carbon filter, so as to attain a PCB concentration in the permanent fluid of less than about 50 ppm.
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Horneck Craig W.
Kimura Shiro G.
McDermott John B.
Shisler Roger A.
Smith Daniel P.
Cahill Robert A.
Cintins Ivars
General Electric Company
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