Risk assessment method for stator transposition bar of AC generator based on fault dataset and Markov chain

IF 5.8 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Engineering Science and Technology-An International Journal-Jestech Pub Date : 2026-01-01 Epub Date: 2025-12-10 DOI:10.1016/j.jestch.2025.102249

Chenguang Wang, Hecheng Yang, Lei Ni, Xu Bian, Dongmei Wang, Yanping Liang

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引用次数: 0

Abstract

The transposition bar is an important component in large generators, the insulation fault in transposition bars is extremely dangerous for the daily operation of generators. The circulating current losses of the stator windings are usually considered in traditional transposition designs. The risk and hazard of the transposition bar inter-strands short-circuit fault are neglected. Therefore, it is necessary to evaluate the risk of the transposition bars. This paper proposes a new risk assessment method for transposition bars. This method enables the comprehensive risk assessment of the design, circulating current losses, and fault risk of transposition bars. Firstly, the strand current of all short-circuit fault schemes of the transposition bar is calculated by the leakage reactance electromotive potential method and the fault dataset is established. Further, based on the fault dataset, risk indexes: severity and probability are proposed. The probability of short-circuit fault for each category is calculated by Markov chain. Finally, the risk indexes of three transposition types are calculated and compared with the traditional index. The risk of 360° and 360°+25 mm transposition is 7.5 times larger than that of 308° transposition. A risk assessment method for the transposition bar is proposed, which considers both operation efficiency and reliability. This method provides a new basis for the transposition designs.

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基于故障数据集和马尔可夫链的交流发电机定子换位杆风险评估方法

换位排是大型发电机的重要部件，换位排的绝缘故障对发电机的日常运行是极其危险的。传统的换位设计通常考虑定子绕组的循环电流损耗。忽略了换位杆股间短路故障的危险性和危害。因此，有必要对换位杆的风险进行评估。提出了一种新的换位杆风险评估方法。该方法能够对换位杆的设计、环流损耗和故障风险进行综合风险评估。首先，采用漏抗电势法计算换位杆各短路故障方案的股电流，建立故障数据集；进一步，基于故障数据集，提出了严重程度和概率风险指标。利用马尔可夫链计算各类别短路故障的概率。最后，计算了三种换位类型的风险指数，并与传统指数进行了比较。360°和360°+ 25mm转位的风险是308°转位的7.5倍。提出了一种兼顾运行效率和可靠性的换位杆风险评估方法。该方法为换位设计提供了新的依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Science and Technology-An International Journal-Jestech Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

11.20

自引率

3.50%

发文量

153

审稿时长

22 days

期刊介绍： Engineering Science and Technology, an International Journal (JESTECH) (formerly Technology), a peer-reviewed quarterly engineering journal, publishes both theoretical and experimental high quality papers of permanent interest, not previously published in journals, in the field of engineering and applied science which aims to promote the theory and practice of technology and engineering. In addition to peer-reviewed original research papers, the Editorial Board welcomes original research reports, state-of-the-art reviews and communications in the broadly defined field of engineering science and technology. The scope of JESTECH includes a wide spectrum of subjects including: -Electrical/Electronics and Computer Engineering (Biomedical Engineering and Instrumentation; Coding, Cryptography, and Information Protection; Communications, Networks, Mobile Computing and Distributed Systems; Compilers and Operating Systems; Computer Architecture, Parallel Processing, and Dependability; Computer Vision and Robotics; Control Theory; Electromagnetic Waves, Microwave Techniques and Antennas; Embedded Systems; Integrated Circuits, VLSI Design, Testing, and CAD; Microelectromechanical Systems; Microelectronics, and Electronic Devices and Circuits; Power, Energy and Energy Conversion Systems; Signal, Image, and Speech Processing) -Mechanical and Civil Engineering (Automotive Technologies; Biomechanics; Construction Materials; Design and Manufacturing; Dynamics and Control; Energy Generation, Utilization, Conversion, and Storage; Fluid Mechanics and Hydraulics; Heat and Mass Transfer; Micro-Nano Sciences; Renewable and Sustainable Energy Technologies; Robotics and Mechatronics; Solid Mechanics and Structure; Thermal Sciences) -Metallurgical and Materials Engineering (Advanced Materials Science; Biomaterials; Ceramic and Inorgnanic Materials; Electronic-Magnetic Materials; Energy and Environment; Materials Characterizastion; Metallurgy; Polymers and Nanocomposites)