Institutional Repository
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/B40B5BCE-CAF1-4670-9F3D-6298E2703C90 | ||
| Year | 2025 | ||
| Type of Item | Diploma Work | ||
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| Bibliographic Citation | Varvara Riga, "Lightning protection of electrically interconnected berthed ships", Diploma Work, School of Electrical and Computer Engineering, Technical University of Crete, Chania, Greece, 2025 https://doi.org/10.26233/heallink.tuc.104104 | ||
| Appears in Collections |
The present thesis investigates the cold-ironing technology, which refers to the electrical interconnection of berthed ships with the onshore power grid. This arrangement allows vessels to shut down their onboard generators, reducing, this way, emissions from fuel combustion and ensuring compliance with international regulations and standards, regarding environmental impact in maritime transport. However, the way a ship’s electrical system ties into the shore grid leaves the overall topology susceptible to lightning strikes. Connections that run through overhead lines and local substations are exposed; the overvoltages produced by lightning can damage critical circuit components.Furthermore, this thesis examines the importance of lightning protection and placement of suitable surge-protection devices in a cold ironing installation. Different lightning-stroke types, such as negative strokes (including subsequent strokes) and positive strokes, were modelled according to the IEC 62305-1 standard, and applied to the cold-ironing topology, in order to pinpoint the factors that affect the system’s safety mostly. Three alternative protection configurations were then tested, selecting the most effective.Finally, simulation results, which were carried out via the ATP-EMTP software, are presented. These simulations highlight the technical challenges of a cold-ironing configuration in the context of lightning strikes and the resulting overvoltages that may arise in each case, as well as the performance of different surge protection topologies. Based on the evaluation of each protection scheme under different lightning strike scenarios, the most efficient protection topology is being pointed out.
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