A STATISTICAL APPROACH TO DESIGNING MITIGATION FOR INDUCED AC VOLTAGES ON PIPELINES

Induced voltage levels on buried pipelines co-located with overhead el ectric power transmission lines are usually mitigated by grounding the pipeline. Maximum effectiveness is obtained when grounds are placed w here the peak induced voltages occur. Mitigation depends on the local soil resistivity. It may be necessary to employ an extensive distribut ed grounding system. Over long distances, however, the soil resistivit y generally varies as a log-normally distributed random variable. The effect of this variability is examined.