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. 2024 Dec 30;14:31703. doi: 10.1038/s41598-024-81902-0

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Summary of post mortem results. (a) Shows damage-pattern maps that indicate much less conductor damage to LBC4 than to LBC2 and LBC3 conductors. (b) YateStar scans of outer 10 turns in selected SP of LBC4. Marginal wavy plastic damage was observed in the ten outer turns of SP1 and SP2 but none in SP3–5. Significant correlated plastic kinking was observed in SP6 and SP7 that initiated at a step discontinuity in the inner winding joint: this was not a result of screening current overstress. The scan of SP8–12 showed no signs of wavy damage that could cause local drops.

Inline graphic — Summary of post mortem results. (a) Shows damage-pattern maps that indicate much less conductor damage to LBC4 than to LBC2 and LBC3 conductors. (b) YateStar scans of outer 10 turns in selected SP of LBC4. Marginal wavy plastic damage was observed in the ten outer turns of SP1 and SP2 but none in SP3–5. Significant correlated plastic kinking was observed in SP6 and SP7 that initiated at a step discontinuity in the inner winding joint: this was not a result of screening current overstress. The scan of SP8–12 showed no signs of wavy damage that could cause local drops.