Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1986-03-04
1987-05-12
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204196, 307 95, C23F 1300
Patent
active
046647643
ABSTRACT:
Method, system and apparatus for carrying out the cathodic protection of structures wherein evaluation of true current and true voltages at the counter electrode is carried out by an integration procedure which is timed in conjunction with the cross-over times of the originating a.c. input to the power source. The system also may employ an IR drop free potential measurement of a variety employing a reference electrode and a control which periodically turns off the fluctuating current drive to the working electrode for purposes of carrying out potential measurement from the reference electrode. To improve performance of the system, as well as the true current measuring features, difference networks are used to develop the difference between the signals of one channel, i.e. ground, and the parallel channel, i.e. positive, leading to the working and reference electrodes. With the arrangement, spurious noise phenomena are cancelled. The system also employs a hierarchal control system which operates in conjunction with a soft start procedure functioning to enhance system reliability.
REFERENCES:
patent: 3634222 (1972-01-01), Stephens
patent: 4080272 (1978-03-01), Ferry
patent: 4160171 (1979-07-01), Merrick
patent: 4219807 (1980-08-01), Speck
patent: 4255242 (1981-03-01), Freeman
patent: 4383900 (1983-05-01), Garrett
patent: 4437957 (1984-03-01), Freeman
patent: 4528460 (1985-07-01), Staerzl
Floyd Bell Associates Inc.
Hsing Ben
Niebling John F.
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