AC Voltage Mitigation
When pipelines are in a common corridor with energized power lines, electric and magnetic fields can cause the unwanted voltage to appear on the pipeline. Induced AC voltage can create safety hazards and contribute to corrosion problems. To address these problems, this induced voltage requires low resistance grounding for mitigation, while cathodic protection demands complete isolation for the pipeline.
Decoupling From Utility Grounding Systems When a cathodically protected structure is tied into the site grounding grid, CP values may be unacceptably low, due to the bond between the site grounding system and the power company grounding system. The CP system attempts to protect the power company grounding system as well. On this case, the PCR can be installed by the power company at the transformer, to provide DC isolation and AC grounding between the two systems. The site CP system will not attempt to protect the power utility grounding system