Electrical & Computer Engineering Department College of Engineering, Sultan Qaboos University, P.O. Box 33, Muscat 123, Oman. E-mail: albadi@squ.edu.om
Electromagnetic interference effects caused by electric power lines or cables on neighboring metallic utilities such as water, gas or oil pipelines became a major concern due to significant increase in the load and short circuit current levels needed to satisfy the load requirements. Another reason for increased interference levels originates from the environmental concerns, which impose on various utilities the obligation to share common corridors. This paper presents a comparison between the pipeline potential caused by overhead transmission lines and electric cables on a practical system. The results reveal that the electric cables produce lower voltage on the pipeline compared with the overhead transmission lines during both steady-state and fault conditions. Moreover, a mitigation system has been designed to reduce the pipeline voltage to satisfactory level during fault condition according to ANSI/IEEE Standard 80 safety criteria. The design was based on the computed voltage profile along the pipeline.
Pipeline Potential, Transmission Lines, Cable, Mitigation
