CP systems use two types of anodes to provide the protective current. Protection using sacrificial anodes involves electrically connecting a metal anode to the pipe that has a corrosion potential that is anodic to that of the steel. Sacrificial anodes are commonly made from magnesium, zinc and aluminium. The use of a non-reactive anode connected to a power supply for the driving voltage is known as an impressed current CP system, and it is this system that has been used in the following analysis. The anodes were impressed current ground beds and modelled a potential of 15V set by a rectifier.
Computer Simulation as an aid to CP System Design and Interference Predictions, Robert Adey and John Baynham, BEASY