Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-01-30
1982-11-02
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 52, 324 71R, 324 72, 324365, G01R 3102, G01R 3108, G01V 315
Patent
active
043575730
ABSTRACT:
This invention relates to monitoring the condition of sheathings which electrically insulate a submarine structure brought to an electrical potential differing from that of the sea water, or to monitoring the operation of the anodes if said pipeline is under cathodic protection.
According to the invention one or more sets of three electrodes, which are spaced apart and aligned parallel to said pipeline, is/are displaced longitudinally above said pipeline, and the difference between the potential of the central one of said electrodes of the or each set and the algebraic sum of the potentials of the other two of said electrodes of the or each set, is measured in continuous fashion.
In carrying out the method there is provided a chassis made of an electrically insulating material which has secured to it one or more sets of three electrodes which are aligned and equidisant, the central one of said electrodes of the or each set being connected to one terminal of an electrical voltage-measuring instrument having two terminals, and the other two of said electrodes of the or each set being connected to the other terminal of said measuring instrument.
REFERENCES:
patent: 2034447 (1936-03-01), Schlumberger
patent: 2123545 (1938-07-01), Pearson
patent: 2345608 (1944-04-01), Lee
patent: 2872638 (1959-02-01), Jones
patent: 3526831 (1970-09-01), Smith
patent: 4078510 (1978-03-01), Morgan
patent: 4099117 (1978-07-01), Erath
patent: 4228399 (1980-10-01), Rizzo et al.
Societe d'Etudes Contre la Corrosion (SECCO)
Strecker Gerard R.
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