Leutron voltage surge and AC corrosion protection for cathodic protection systems is now available from Westek Electronics .
Corrosion of steel by alternating current has been investigated as far back as the early 1900’s. In 1986, however, an investigation into a corrosion failure on a high pressure gas pipeline in Germany indicated that the sole cause of the failure was AC corrosion.
This AC corrosion failure on an otherwise well protected pipeline resulted in several laboratory and field studies which indicated that, above a certain minimum AC current density, normal levels of corrosion protection will not control AC corrosion to acceptable levels and that AC mitigation may be required to prevent serious corrosion. Pipeline in the vicinity of AC traction and buried power cables could be subject to this form of corrosion.
To this end, Leutron GmbH has developed a comprehensive cathodic protection system for pipelines subject to the possibility of AC interference with the DC protection process.
To prevent the interference of AC current, Leutron cathodic protection systems provide a low impedance path by way of a PL Pro 40 A diverter, which is attached between the pipeline and surrounding earth.
The device comprises of a CT monitored, surge protected capacitive low impedance path. To protect the entire cathodic protection system Leutron provides transient protection for the DC power supply, for the reference anode, anode and cathode as well as transient protection across insulated pipe section flanges.