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As indicated by Faraday's legislation of electromagnetic induction, an aerial metallic pipeline will produce electricity if drawn in close proximity of a high voltage power transmission line. This paper begins with an examination of the induced voltage under the normal operating conditions of power transmission lines, followed by techniques of passive mitigation of the induced voltages. In comparison to using shielding material with high permeability, the induced voltage levels can be reduced to 60% using the correct location of loop conductors and the number of loops.
Traditional buried pipes are mainly made of metal products. Non-metallic pipes, ceramic pipes, and concrete pipes have taken their place in many pipeline networks such as water supply, drainage, heat, industry, oil, and gas, with the growth of material science and technology in recent years. The location of the buried metal pipeline have gotten more reliable, but detection and location techniques for the non-metallic pipelines are still in the works. Then the scientific characteristics of each detection and location technique have been compared, with their strengths and weaknesses indicating.
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