8 - Impressed Current Equipment and Transformer-Rectifiers
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Publisher SummaryImpressed current stations for buried tanks are connected to the electricity supply of the site on which the tank stands. On the other hand, the location of a protection installation for local distribution and for transmission lines is determined principally by the availability of connection to a public electricity supply grid because considerable costs are involved in connecting a very long voltage supply to the grid. With a very large current requirement, it is of only secondary importance that the anodes must be installed in a region of low soil resistivity. In choosing a site for protection installations for steel–water structures, decisive factors are the location in the harbor area and the need to keep the lengths of cable to the protected object and anode as short as possible where very high protection currents are involved. The units and ancillary equipment must be protected from mechanical damage and the effects of weather to ensure the reliable operation of an impressed current station. This is achieved by installing it in a weatherproof plastic housing. Transformer–rectifiers are produced for use in corrosion protection stations with a rated dc output of about 10 W for storage tanks and short pipelines as well as up to a few kilowatts for large steel–water constructions. In general, T–Rs for pipelines have an output of 100 to 600 W. It is recommended that the rated current of the T–R must be twice that of the required current so that sufficient reserve is available to cope with potential future enlargement of the installation, a possible decrease in the coating resistance, increase in stray currents, or other changes.

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