Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1995-04-28
1997-05-06
Jordan, Charles T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204197, C23F 1300
Patent
active
H00016446
ABSTRACT:
A method and apparatus for cathodically protecting basic steel and iron sctures located in an electrolyte without requiring any auxiliary backup power means on a continual basis. The method and impressed current type system use a PV solar panel array to supply dedicated DC operating current after the structure is first initially temporarily provided with preconditioning polarization on a one-time-only basis for a predetermined extended continuous time period, such as from about 3-7 days, by a separate non-solar DC generating means, thereby impressing it with the requisite beneficial relatively high negative potential which completes the initial polarization. The temporary power source is then permanently disconnected and the solar array is promptly connected in circuit to continue to provide the requisite high negative beneficial potentials which were achieved by the preconditioning polarization, and to thereby maintain the cathodic protection. The impressed relatively high negative potential has a slower rate of decay that permits the use of a PV solar array, and provides excess available power without the customary auxiliary backup power means, such as batteries. This unique method enables the system to easily maintain the impressed current cathodic protection system indefinitely even during inclement weather and nighttime conditions. In an alternate form of the invention, an ultracapacitor operating in circuit with a current limiter and at least one blocking diode may replace the temporary power source.
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Chelliah Meena
Connors, Jr. Edward J.
Dobyns Kenneth W.
Jordan Charles T.
The United States of America as represented by the Secretary of
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