Analysis of Fine Fault Electrothermal Characteristics of Converter Transformer Reduced-Scale Model

Xiu Zhou, Yan Luo (), Lin Zhu, Jin Bai, Tian Tian, Bo Liu, Yuhua Xu and Wenliang Zhao
Additional contact information
Xiu Zhou: Electric Power Research Institute of State Grid Ningxia Electric Power Co., Ltd., Yinchuan 750002, China
Yan Luo: Electric Power Research Institute of State Grid Ningxia Electric Power Co., Ltd., Yinchuan 750002, China
Lin Zhu: State Grid Ningxia Electric Power Co., Ltd, Yinchuan 750001, China
Jin Bai: Electric Power Research Institute of State Grid Ningxia Electric Power Co., Ltd., Yinchuan 750002, China
Tian Tian: Electric Power Research Institute of State Grid Ningxia Electric Power Co., Ltd., Yinchuan 750002, China
Bo Liu: Ultra-High Voltage Company of State Grid Ningxia Electric Power Co., Ltd., Yinchuan 750011, China
Yuhua Xu: Electric Power Research Institute of State Grid Ningxia Electric Power Co., Ltd., Yinchuan 750002, China
Wenliang Zhao: School of Electrical Engineering, Shandong University, Jinan 250100, China

Energies, 2024, vol. 17, issue 5, 1-20

Abstract: Converter transformer is the key equipment in UHVDC transmission. If a local overheating fault occurs, it will inevitably form a local hot spot on the core, winding or other structural parts. Among these faults, multipoint grounding and interlaminar short circuit faults account for 30–50% of core accidents. The continuous overheating of 150–250 °C will cause ablation on the silicon steel sheet, which will destroy the insulation material and reduce the insulation performance. In severe cases, it will cause thermal expansion, resulting in local deformation or displacement of the core. Considering the scale of size and temperature parameters, the scale model of converter transformer is established based on the principle of constant magnetic flux density. By using the homogenization theory, the scaled model under multipoint grounding and interlaminar short circuit fault is simulated by electromagnetic heat. First, the single-phase four-column model of the core is established according to the scaled principle, and the core is refined. Secondly, taking the refined model as the research object, the magnetic thermal coupling simulation and analysis are carried out under multi-point grounding and interlaminar short circuit fault, and the magnetic density, eddy current loss and temperature distribution on each lamination are obtained. Finally, the correctness of the simulation is verified by the one-dimensional eddy current loss analytical equation, which provides a reference for the local overheating problem of converter transformers.

Keywords: converter transformer; reduced-scale model; refinement; multi-point grounding; short circuit between pieces; temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/5/1047/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/5/1047/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:5:p:1047-:d:1344137

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().