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Advances in Design, Operation and Maintenance Technology for Electric Power Equipment

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: 25 May 2025 | Viewed by 1223

Special Issue Editors

Dr. Jiachen Gao

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Guest Editor
State Key Laboratory of High-Efficiency and High-Quality Conversion for Electric Power, College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Interests: design and maintenance technology for high-voltage power equipment
Prof. Dr. Tianyan Jiang

E-Mail Website
Guest Editor
School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China
Interests: intelligent sensing and condition assessment of power equipment
Dr. Yaqi Fang

E-Mail Website
Guest Editor
School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan 430068, China
Interests: monitoring and maintenance of transmission and transformation equipment
Dr. Jinxin Cao

E-Mail Website
Guest Editor
School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
Interests: lightning physics; lightning protection; electromagnetic transient modeling

Special Issue Information

Dear Colleagues,

Electric power equipment is the foundation of the five major segments of the power system: generation, transmission, substation, distribution and consumption. Guaranteeing the reliable operation of electric power equipment is the key to ensuring the stability of the power system. Proven experiences in design, operation and maintenance all have positive implications for the reliability of electric power equipment. Therefore, the aim of this Special Issue is to discuss the latest research advances in electric power equipment design, operation and maintenance technologies to promote the reliability, efficiency and sustainability of the power system. We invite researchers in the field of power engineering to submit reviews and research articles in related areas.

Electric power equipment includes, but is not limited to, thermal/hydroelectric generators, wind turbines, photovoltaic systems, grounding grids, transmission lines, towers, insulators, GIS/GIL, transformers, circuit breakers, cables, switchgears, electric vehicles and new power electronics-based equipment (flexible DC converters, power electronic transformers, etc.).

Potential topics include, but are not limited to, discharge mechanisms and characteristics, insulation aging and lifecycle, topology, multi-physics, loss optimization, automation and intelligence, inspection and detection technology, condition monitoring and fault diagnosis, disaster prevention technology (lightning, wildfire, bird, etc.), maintenance technology, live-line work, operational control and optimization, and new AI-based applications.

Dr. Jiachen Gao
Prof. Dr. Tianyan Jiang
Dr. Yaqi Fang
Dr. Jinxin Cao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • electric power equipment
  • electrical insulation
  • multi-physics
  • operation and maintenance
  • artificial intelligence

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Published Papers (3 papers)

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Research

20 pages, 5717 KiB  
Article
On-Line Insulation Monitoring Method of Substation Power Cable Based on Distributed Current Principal Component Analysis
by Haobo Yang, Jingang Wang, Pengcheng Zhao, Chuanxiang Yu, Hongkang You and Jinyao Dou
Energies 2025, 18(3), 688; https://doi.org/10.3390/en18030688 (registering DOI) - 2 Feb 2025
Viewed by 269
Abstract
Monitoring the insulation condition of power cables is essential for ensuring the safe and stable operation of the substation power supply system. Leakage current is an important indicator of insulation performance of power cables. However, the application of leakage current monitoring methods in [...] Read more.
Monitoring the insulation condition of power cables is essential for ensuring the safe and stable operation of the substation power supply system. Leakage current is an important indicator of insulation performance of power cables. However, the application of leakage current monitoring methods in substations is limited due to issues such as neutral line shunting on the load side and the spatial isolation of the phase-to-neutral line in the power cabinet. This paper proposes an insulation monitoring method based on distributed current principal component analysis for power cables in substations. Firstly, the leakage current of substation power cable is measured by a distributed current extraction method, and the cable insulation condition is preliminarily judged. Then, considering the problem of measurement error interference in the process of distributed current synthesis, an evaluation method of power cable insulation state based on principal component analysis of distributed current is proposed. To verify the feasibility of the proposed method, both simulation and laboratory tests were conducted. The results indicate that the proposed method can effectively measure the leakage current of power cables in substations and realize the accurate distinction between measurement error and cable insulation degradation characteristics. The method offers a novel idea for insulation monitoring of substation power cables. Full article
(This article belongs to the Special Issue Advances in Design, Operation and Maintenance Technology for Electric Power Equipment)
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15 pages, 5542 KiB  
Article
Array Coil Design and Experimental Verification for Separation of Tower Grounding Pulsed Eddy Current Excitation and Response Magnetic Field Signals
by Zhiwu Zeng, Zheng Guo, Fan Gan, Yun Zuo, Xu Tian, Xinxun Wang, Zhichi Lin, Wanyi Zhu, Xiaotian Wang and Jingang Wang
Energies 2025, 18(2), 364; https://doi.org/10.3390/en18020364 - 16 Jan 2025
Viewed by 338
Abstract
Transmission line towers play an important role in power transmission, and the assessment of transmission line tower grounding by pulsed eddy current detection technology is conducive to the safe and reliable operation of power transmission. Aiming at the problem that the primary and [...] Read more.
Transmission line towers play an important role in power transmission, and the assessment of transmission line tower grounding by pulsed eddy current detection technology is conducive to the safe and reliable operation of power transmission. Aiming at the problem that the primary and secondary magnetic fields of the traditional pulsed eddy current transmitting coil structure overlap, resulting in the loss of shallow information, this paper first discusses the loss of shallow information caused by the aliasing of the magnetic field under the non-zero current shutdown effect, and then analyzes the traditional weak magnetic field coupling separation principle, and proposes the array coil structure of this paper based on the magnetic field vector destructive separation principle. Subsequently, the corresponding finite element simulation model was established, and the magnetic field distribution, magnetic field size, induced voltage, and mutual inductance coefficient of the array coil and the traditional center loop structure at the receiving coil were compared in the static field. In the transient field, the response signal of the array coil structure with or without the grounding body and the receiving coil is equidistant was simulated. The simulation results show that, under the same excitation, the vector coil array structure can greatly reduce the mutual inductance coefficient between the excitation and transmitting coils, reduce the influence of the primary magnetic field of the excitation coil on the receiving coil, and avoid the loss of shallow information. Finally, experimental tests were carried out on different tower grounding bodies. The experimental results at different measuring points prove that the array coil structure proposed in this paper can separate well the magnetic field generated by the excitation signal, improve the effective resolution time, avoid the loss of shallow information, and improve the operational stability of power transmission systems. Full article
(This article belongs to the Special Issue Advances in Design, Operation and Maintenance Technology for Electric Power Equipment)
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17 pages, 3760 KiB  
Article
Method and Experimental Research of Transmission Line Tower Grounding Body Condition Assessment Based on Multi-Parameter Time-Domain Pulsed Eddy Current Characteristic Signal Extraction
by Yun Zuo, Jie Wang, Xiaoju Huang, Yuan Liu, Zhiwu Zeng, Ruiqing Xu, Yawen Chen, Kui Liu, Hongkang You and Jingang Wang
Energies 2025, 18(2), 322; https://doi.org/10.3390/en18020322 - 13 Jan 2025
Viewed by 377
Abstract
Pole tower grounding bodies are part of the normal structure of the power system, providing relief from fault currents and equalizing overvoltage channels. They are important devices; however, in the harsh environment of the soil, they are prone to corrosion or even fracture, [...] Read more.
Pole tower grounding bodies are part of the normal structure of the power system, providing relief from fault currents and equalizing overvoltage channels. They are important devices; however, in the harsh environment of the soil, they are prone to corrosion or even fracture, which in turn affects the normal utilization of the transmission line, so accurately assessing the condition of grounding bodies of the power grid is critical. To assess the operational status of a grounding body in a timely manner, this paper proposes a multi-parameter pulsed eddy current (PEC) time-domain characteristic signal corrosion classification method for the detection of the state of a pole tower grounding body. The method firstly theoretically analysed the influence of multi-parameter changes on the PEC response time-domain feature signal caused by grounding body corrosion and extracts the decay time constant (DTC), and the decay time constant stabilization value (DTCSV) and time to stabilization (TTS) were obtained based on the DTC time domain characteristics for describing the corrosion of the grounding body. Subsequently, DTCSV and TTS were used as inputs to a support vector machine (SVM) to classify the corrosion of the grounding body. A simulation model was constructed to investigate the effect of multiparameter time on the DTCSV and TTS of the tower grounding body based on the single-variable method, and the multiparameter time-domain characterization method used for corrosion assessment was validated. Four defects with different corrosion levels were classified using the optimized SVM model, with an accuracy rate of 95%. Finally, a PEC inspection system platform was built to conduct classification tests on steel bars with different degrees of corrosion, and the results show that the SVM classification model based on DTCSV and TTS has a better discriminatory ability for different corrosive grounders and can be used to classify corrosion in the grounders of poles towers to improve the stability of power transmission. Full article
(This article belongs to the Special Issue Advances in Design, Operation and Maintenance Technology for Electric Power Equipment)
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