Magnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent

Non-insulation high-temperature superconducting coils provide a much lower risk of burnout in fault/abnormal conditions, such as hot-spot quench and overcurrent. This study employs an equivalent circuit grid model, coupled with magnetic field calculation and the <i>E</i>–<i>J</i...

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Autores principales:	Wei Wu, Yusong Gao, Zhijian Jin
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	high-temperature superconductor non-insulation coil overcurrent numerical modeling magnetic field saturation Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/9e5fc6c2eba849428098e3f61c199472
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id	oai:doaj.org-article:9e5fc6c2eba849428098e3f61c199472
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spelling	oai:doaj.org-article:9e5fc6c2eba849428098e3f61c1994722021-11-25T17:24:39ZMagnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent10.3390/electronics102227892079-9292https://doaj.org/article/9e5fc6c2eba849428098e3f61c1994722021-11-01T00:00:00Zhttps://www.mdpi.com/2079-9292/10/22/2789https://doaj.org/toc/2079-9292Non-insulation high-temperature superconducting coils provide a much lower risk of burnout in fault/abnormal conditions, such as hot-spot quench and overcurrent. This study employs an equivalent circuit grid model, coupled with magnetic field calculation and the <i>E</i>–<i>J</i> power law of superconductors, to deeply and systematically investigate the overcurrent charging process in a double-pancake non-insulation coil. An evident saturation of the magnetic field in the axial direction of the coil was observed and verified by experiments. Experimentally, the entire process, including the behavior of the magnetic field, was consistent with the numerical results. Based on the verified model, two main points were addressed: (1) Transient current distribution inside the coil during overcurrent charging was studied. Potential quenching risks were found to be at the innermost and outermost turn near the electrodes, as well as the pancake-to-pancake connection part. (2) Magnetic field saturation, which is a unique phenomenon in non-insulation superconducting coils during overcurrent charging, was studied in detail and first quantitatively defined by a new concept “converged load factor”. Its relationship with turn-to-turn resistivity was revealed.Wei WuYusong GaoZhijian JinMDPI AGarticlehigh-temperature superconductornon-insulation coilovercurrentnumerical modelingmagnetic field saturationElectronicsTK7800-8360ENElectronics, Vol 10, Iss 2789, p 2789 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	high-temperature superconductor non-insulation coil overcurrent numerical modeling magnetic field saturation Electronics TK7800-8360
spellingShingle	high-temperature superconductor non-insulation coil overcurrent numerical modeling magnetic field saturation Electronics TK7800-8360 Wei Wu Yusong Gao Zhijian Jin Magnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent
description	Non-insulation high-temperature superconducting coils provide a much lower risk of burnout in fault/abnormal conditions, such as hot-spot quench and overcurrent. This study employs an equivalent circuit grid model, coupled with magnetic field calculation and the <i>E</i>–<i>J</i> power law of superconductors, to deeply and systematically investigate the overcurrent charging process in a double-pancake non-insulation coil. An evident saturation of the magnetic field in the axial direction of the coil was observed and verified by experiments. Experimentally, the entire process, including the behavior of the magnetic field, was consistent with the numerical results. Based on the verified model, two main points were addressed: (1) Transient current distribution inside the coil during overcurrent charging was studied. Potential quenching risks were found to be at the innermost and outermost turn near the electrodes, as well as the pancake-to-pancake connection part. (2) Magnetic field saturation, which is a unique phenomenon in non-insulation superconducting coils during overcurrent charging, was studied in detail and first quantitatively defined by a new concept “converged load factor”. Its relationship with turn-to-turn resistivity was revealed.
format	article
author	Wei Wu Yusong Gao Zhijian Jin
author_facet	Wei Wu Yusong Gao Zhijian Jin
author_sort	Wei Wu
title	Magnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent
title_short	Magnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent
title_full	Magnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent
title_fullStr	Magnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent
title_full_unstemmed	Magnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent
title_sort	magnetic field saturation of non-insulation high-temperature superconducting coils during overcurrent
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9e5fc6c2eba849428098e3f61c199472
work_keys_str_mv	AT weiwu magneticfieldsaturationofnoninsulationhightemperaturesuperconductingcoilsduringovercurrent AT yusonggao magneticfieldsaturationofnoninsulationhightemperaturesuperconductingcoilsduringovercurrent AT zhijianjin magneticfieldsaturationofnoninsulationhightemperaturesuperconductingcoilsduringovercurrent
_version_	1718412424052211712

Magnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent

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