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Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC

Vacuum on-load tap-changers (OLTC) for converter transformers have a much higher number of breakings than conventional circuit breakers. Contact ablation after several breakings will affect the stability and life of the device. This paper establishes the electromagnetic thermal multi-physical field...

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Detalles Bibliográficos
Autores principales: Zhang, Mingyu, Tan, Yaxiong, Yang, Chi, Deng, Jun, Xie, Zhicheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10532973/
https://www.ncbi.nlm.nih.gov/pubmed/37763621
http://dx.doi.org/10.3390/ma16186344
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author Zhang, Mingyu
Tan, Yaxiong
Yang, Chi
Deng, Jun
Xie, Zhicheng
author_facet Zhang, Mingyu
Tan, Yaxiong
Yang, Chi
Deng, Jun
Xie, Zhicheng
author_sort Zhang, Mingyu
collection PubMed
description Vacuum on-load tap-changers (OLTC) for converter transformers have a much higher number of breakings than conventional circuit breakers. Contact ablation after several breakings will affect the stability and life of the device. This paper establishes the electromagnetic thermal multi-physical field coupling model of the vacuum interrupter for OLTC based on the finite element analysis method. The thermal field distribution of normal and ablative contact materials during the breaking process was analyzed. The key parameters affecting the contact temperature under the cumulative number of breakings are analyzed and the optimized design is completed. The simulation results show that the contact surface reaches a maximum temperature of 1390 K at 8 ms. There is a significant increase in the area of the high-temperature area on the contact surface. The possibility of re-ignition of the interrupter is increased. Based on the judgment matrix method, the key influencing parameters of the contact temperature rise are analyzed. The final parameters are selected as follows: contact material—CuCr8 alloy, contact seat thickness—2 mm, contact thickness—10 mm, and contact diameter—40 mm.
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spelling pubmed-105329732023-09-28 Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC Zhang, Mingyu Tan, Yaxiong Yang, Chi Deng, Jun Xie, Zhicheng Materials (Basel) Article Vacuum on-load tap-changers (OLTC) for converter transformers have a much higher number of breakings than conventional circuit breakers. Contact ablation after several breakings will affect the stability and life of the device. This paper establishes the electromagnetic thermal multi-physical field coupling model of the vacuum interrupter for OLTC based on the finite element analysis method. The thermal field distribution of normal and ablative contact materials during the breaking process was analyzed. The key parameters affecting the contact temperature under the cumulative number of breakings are analyzed and the optimized design is completed. The simulation results show that the contact surface reaches a maximum temperature of 1390 K at 8 ms. There is a significant increase in the area of the high-temperature area on the contact surface. The possibility of re-ignition of the interrupter is increased. Based on the judgment matrix method, the key influencing parameters of the contact temperature rise are analyzed. The final parameters are selected as follows: contact material—CuCr8 alloy, contact seat thickness—2 mm, contact thickness—10 mm, and contact diameter—40 mm. MDPI 2023-09-21 /pmc/articles/PMC10532973/ /pubmed/37763621 http://dx.doi.org/10.3390/ma16186344 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhang, Mingyu
Tan, Yaxiong
Yang, Chi
Deng, Jun
Xie, Zhicheng
Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC
title Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC
title_full Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC
title_fullStr Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC
title_full_unstemmed Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC
title_short Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC
title_sort analysis and optimization of contact material ablation under the cumulative effect of the number of breakings of oltc
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10532973/
https://www.ncbi.nlm.nih.gov/pubmed/37763621
http://dx.doi.org/10.3390/ma16186344
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