Method for reclassifying PCB transformers

Electricity: conductors and insulators – With fluids or vacuum – With fluid maintenance or conditioning means

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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.

REFERENCES:
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patent: 4744905 (1988-05-01), Atwood
J. Reason and W. Bloomquist, "PCB Replacements: Where the Transformer Industry Stands Now", Power, Oct., 1979, pp. 64-65.
T. O'Neil and J. J. Kelly, "Silicone Retrofill of Askarel Transformers", Proc. Elec./Electron, Insul, Conf., 13, 167-170 (1977).
Federal Register, vol. 48, No. 1, Jan. 3, 1983, pp. 121 and 125-136 Polychlorinated Biphenyls (PCBs) Manufacturing, Processing, Distribution in Commerce and Use Prohibitions; Amendment: To Use Authorization for PCB Railroad Transformers.
R. H. Parrish and S. D. Myers, "An Update of the Use, Labeling, Handling and Disposal of PCBs", IEEE Cat., #0190-2172/81, pp. 15-24.
Gilbert Addis and Bentsu Ro, "Equilibrium Study of PCB's Between Transformer Oil and Transformer Solid Materials", EPRI PCB Seminar, Dec. 3, 1981.

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