A calculation model for cathodic protection of underground extensive structures using impressed current cable anodes |
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Authors: | W Machczyñski |
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Affiliation: | Poznan University of Technology, Institute of Industrial Electrical Engineering, ul. Piotrowo 3 A, 60-965 Pozna?, Poland e-mail: mawo@sol.put.poznan.pl, PL
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Abstract: | Proper design of cathodic protection by use of impressed current cable anodes requires the knowledge of current and potential
distribution along the anode and the structure to be protected. The conductive coupling between these earth-return circuits
results in different current and potential distributions along both structures when comparing with the case of separate anode.
In the paper calculation models – accurate and simplified – are presented. In the accurate model an interchange of currents
flowing along both structures is taken into account, whereas in the simplified method the structures are treated as separate
earth return circuits. The formulas are derived for calculation of such parameters as longitudinal current, protective current
density, potential to the remote earth and potential to the adjacent earth. Calculations have been carried out in which the
influence of the distance between the two structures on the values and distribution of currents and potentials along the anode
and the protected structure has been examined. The relations presented may be useful at design stage of impressed current
cathodic protection systems containing cable anodes.
Received: 15 February 2001/Accepted: 15 March 2001 |
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Keywords: | Cathodic protection Cable anode Earth-return circuit Conductive coupling Calculation model |
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