This paper presents a theoretical simulation for a pipeline running in parallel to AC overhead power lines using the 'CONCEPT II' package. This package is based on the method of moment combined with a transmission line model. A 1 km long, 132 kV, three-phase, double-circuit transmission line, and a 2 km long, 40 cm diameter, 1 m high above ground pipeline is modelled. Extra shielding wires under the phase conductors are investigated. Produced voltages in the pipeline are computed under steady-state power frequency (50 Hz) as well as under direct and indirect lightning strikes to the power line. Different current waveforms are simulated to cover the whole range of those of the anticipated lightning. Under lightning strikes, the voltages across line insulators are computed, too. The results reveal that the extra shielding wires give many advantages, namely: 1. reducing the power-frequency electric and magnetic fields at the ground level to meet the regularity limits; 2. improving the shielding effectiveness during lightning strikes by reducing the insulator voltages; 3. mitigating the induced voltages in any metallic structure near the power lines, that is, in the pipelines; and 4. using them as optical ground wires for telecommunication purposes, where the probability of lightning strikes to such a wire is much lower than that for the normally used grounding wire(s) at the tower top.
Mitigation of the produced voltages in AC overhead power-lines/ pipelines parallelism during power frequency and lightning conditions
Unterdrückung von netzfrequenten und durch Blitzentladungen hervorgerufenen Störspannungen in parallelen Anordnungen von Hochspannungsfreileitungen und Pipelines
European Transactions on Electrical Power - ETEP ; 15 , 4 ; 351-369
2005
19 Seiten, 13 Bilder, 1 Tabelle, 24 Quellen
Article (Journal)
English
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