Study on Impact of Lightning on Hybrid Cable - Overhead Lines
Authors
Sabnis, Shreyas Sandeep ; Jalaik, Vishakha
Term
4. term
Education
Publication year
2023
Submitted on
2023-06-02
Pages
60
Abstract
Historiske data viser, at lyn er en af de hyppigste årsager til fejl og udfald på luftledninger. Når elnet i stigende grad kombinerer luftledninger og jordkabler, kan et lynnedslag i luftledningen også påvirke jordkablet og skabe overspændinger. For at mindske denne risiko er det nødvendigt at forstå, hvordan de meget hurtige, kortvarige påvirkninger fra lyn (lyntransienter) bevæger sig i systemet, og hvordan man kan dæmpe dem. En central mulighed er jordingsstrategien – altså hvordan ledninger og kabler forbindes til jord, så lynstrømme ledes sikkert væk. I dette speciale analyseres forskellige jordingskonfigurationer for luftledningens skærmtråd (beskyttelseswire i toppen) og jordkablets kabelskærm (den yderste ledende kappe). På baggrund af analyserne er målet at pege på den mest egnede jordingsløsning, der kan forbedre transmissionssystemets modstandsdygtighed over for lyn.
Historical data show that lightning is a leading cause of faults and outages on overhead power lines. As power networks increasingly combine overhead lines with underground cables, a strike on the overhead section can also affect the cable and create overvoltages (sudden voltage spikes). To reduce this risk, we need to understand how the very fast, short-lived effects from lightning (lightning transients) travel through the system and how to limit them. A key lever is grounding (earthing): how lines and cables are connected to the earth so lightning currents can be safely discharged. This thesis analyzes different grounding configurations for the overhead line’s shield wire (the protective wire at the top) and the underground cable’s metallic sheath (its outer conductive layer). Based on the analysis, the aim is to identify the most suitable grounding strategy to improve the transmission system’s performance against lightning.
[This summary has been rewritten with the help of AI based on the project's original abstract]
Keywords
OHL ; UGC ; Lightning ; Lightning Study ; Hybrid lines ; Grounding ; Cross bonding ; Both ends bonded
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