Abstract
This paper presents a numerical study on the reduction in the voltage and current induced on a 13.5 km buried metallic pipeline by an overhead power line. The mitigation effectiveness of different configurations and cross-section shapes of screening conductors is computed by means of a methodology that combines a 2D Finite Element Analysis with circuital analysis. A 35.72% reduction of the maximum induced voltage is obtained when 4 cylindrical steel screening conductors with 8 mm radius are buried 0.25m below the soil surface, along the pipeline path. The maximum induced pipeline current is reduced by 26.98%. A parametric study is also performed, to assess the influence of the per-unit-length admittance to earth of the screening conductors on the mitigation efficacy. The results show that screening conductors may help in reducing the inductive coupling between overhead power lines and buried metallic pipelines, and that the assumption of perfectly insulated screening conductors leads to an underestimation of the produced mitigation effect.
Highlights
Metallic pipelines located in the proximity of power lines can be exposed to electromagnetic interference during both normal operating conditions and faults of the latter [1,2,3].Because of the high cost of right-of-ways, it is unavoidable that the pipelines share the same corridor with high-voltage AC (HVAC) power lines [4,5,6]
For an overhead power line in sinusoidal steady-state, the most significant coupling mechanism of the three above mentioned is the inductive coupling mechanism, which is due to the magnetic field generated by the power line currents [15,16]
The use of screening conductors buried in the soil above the metallic pipelines appears as a feasible solution to attenuate the voltage generated on the pipeline by inductive coupling [22]
Summary
Metallic pipelines located in the proximity of power lines can be exposed to electromagnetic interference during both normal operating conditions and faults of the latter [1,2,3].Because of the high cost of right-of-ways, it is unavoidable that the pipelines share the same corridor with high-voltage AC (HVAC) power lines [4,5,6]. It is likely that electromagnetic interference may occur, where the source is constituted by the HVAC power line and the victim by the metallic buried pipeline [7,8,9]. This electromagnetic interference consists of inductive, capacitive and conductive contributions [10]. The capacitive coupling ( called electrostatic coupling) is not significant as the earth provides a quite efficient screen to the electrostatic field generated by the difference of potential between the power line and the pipeline [11]. The use of screening conductors buried in the soil above the metallic pipelines appears as a feasible solution to attenuate the voltage generated on the pipeline by inductive coupling [22]
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