High Voltage最新文献

{"title":"Space Charge and Breakdown Properties of PP-Based Insulation Interface in Extrusion Molded Joint for HVDC Submarine Cables","authors":"Zhonglei Li, Zhong Zheng, Zhaorui Luo, Kai Gao, Xiongjun Liu, Boxue Du","doi":"10.1049/hve2.70031","DOIUrl":"https://doi.org/10.1049/hve2.70031","url":null,"abstract":"This paper focuses on the space charge and breakdown characteristics of polypropylene (PP)-based insulation interface in extrusion moulded joint (EMJ) for high-voltage direct current (HVDC) submarine cables. The double-layered flat samples and cylindrical samples are prepared to imitate the interface in the PP-insulated EMJ. The DC conductivity, space charge, and breakdown strength are tested. The results demonstrate that in the EMJ manufacturing process, the lower wielding temperature leads to microdefects at the insulation interface. As shallow traps, the microdefects exacerbate hetero charge accumulation, thereby intensifying the electric field distortion and increasing the conductivity. Meanwhile, the interfacial microdefects lead to a reduction in the insulation breakdown strength. At 90°C, the normal and tangential breakdown strengths decrease by a maximum of 20.6% and 54.5%, respectively. Notably, the space charges and microdefects lead to a rapid decline in the breakdown strength after hetero polarity pre-stressing. Especially for the tangential breakdown strength, the maximum decrease rate reaches 22.9%. Therefore, the interfacial microdefects caused by the drop in the welding temperature are the primary factors leading to a serious decrease in the electrical properties of EMJ insulation, making the EMJ insulation weaker than PP cable insulation.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"49 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144371089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic Thermal Modelling for Core-Type High-Frequency Transformers Based on Air-Solid Surface Nusselt Number Calibration","authors":"Lujia Wang, Qiao Liang, Mengdi Yang, Hailong Zhang, Ting Chen, Chenliang Ji, Jianwen Zhang","doi":"10.1049/hve2.70053","DOIUrl":"https://doi.org/10.1049/hve2.70053","url":null,"abstract":"Quickly and accurately obtaining the internal temperature distribution of a transformer plays a key role in predicting its operating conditions and simplifying the maintenance process. A reasonable equivalent thermal circuit model is a relatively reliable method of obtaining the internal temperature distribution. However, thermal circuit models without targeted consideration of operating conditions and parameter corrections usually limit the accuracy of the results. This paper proposed a five-node transient thermal circuit model with the introduction of nonlinear thermal resistance, which considered the internal structure and winding layout of the core-type high-frequency transformer. The Nusselt number, a crucial variable in heat convection calculations and directly related to the accuracy of thermal resistance parameters, was calibrated on the basis of the distribution of external cooling air. After parameter calibration, the maximum computational error of the hotspot temperature is reduced by 5.48% compared with that of the uncalibrated model. Finally, an experimental platform for temperature monitoring was established to validate the five-node model and its ability to track the temperature change at each reference point after calibrating the Nusselt number.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"24 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144371090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of the failure mechanism of ZnO varistors influenced by high-resistance media based on multi-field coupling simulation","authors":"Pengfei Meng, Yue Yin, Lei Wang, Jingke Guo, Zerui Li, Kai Zhou, Guangya Zhu, Yefei Xu","doi":"10.1049/hve2.70034","DOIUrl":"https://doi.org/10.1049/hve2.70034","url":null,"abstract":"This study focuses on the distribution of high-resistance media (pores and spinels) within <span data-altimg=\"/cms/asset/5bd5d10b-9b01-4f3a-9176-607d4c438cb2/hve270034-math-0001.png\"></span><mjx-container ctxtmenu_counter=\"139\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"><mjx-math aria-hidden=\"true\" location=\"graphic/hve270034-math-0001.png\"><mjx-semantics><mjx-mrow><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic-font=\"normal\" data-semantic- data-semantic-role=\"unknown\" data-semantic-speech=\"ZnO\" data-semantic-type=\"text\"><mjx-c></mjx-c><mjx-c></mjx-c><mjx-c></mjx-c></mjx-mtext></mjx-mrow></mjx-semantics></mjx-math><mjx-assistive-mml display=\"inline\" unselectable=\"on\"><math altimg=\"urn:x-wiley:23977264:media:hve270034:hve270034-math-0001\" display=\"inline\" location=\"graphic/hve270034-math-0001.png\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><semantics><mrow><mtext data-semantic-=\"\" data-semantic-annotation=\"clearspeak:unit\" data-semantic-font=\"normal\" data-semantic-role=\"unknown\" data-semantic-speech=\"ZnO\" data-semantic-type=\"text\">ZnO</mtext></mrow>$text{ZnO}$</annotation></semantics></math></mjx-assistive-mml></mjx-container> varistors and explores the mechanical and electrical failure mechanisms of varistors under different pulse actions. Micro-CT technology revealed that the proportion of high-resistance media in the edge area is much higher than in the internal area. Simulation results indicated that a high porosity significantly increased temperature rise and thermal stress concentration, while a high spinel proportion exacerbated current concentration but had a relatively minor impact on the distribution of temperature rise and thermal stress. Under an electric field of 1000–1250 V/mm, pores transition from an insulating state to a conductive state, especially in the edge area, leading to concentrated temperature rise and thermal stress. Once the thermal stress exceeded the critical value of the mechanical strength of the pores, cracking failure occurred. The high spinel proportion in the edge area further intensified current concentration under high electric fields, working together with the conductivity of the pores to produce a significant local temperature rise, melting grain structure, and ultimately leading to puncture failure. This study provides a new perspective for understanding the failure mechanism of <span data-altimg=\"/cms/asset/9372901b-e4fd-4dfe-b121-3c2ccf1e318e/hve270034-math-0002.png\"></span><mjx-container ctxtmenu_counter=\"140\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"><mjx-math aria-hidden=\"true\" location=\"graphic/hve270034-math-0002.png\"><mjx-semantics><mjx-mrow><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic-font=\"normal\" data-semantic- data-semantic-role=\"unknown\" data-semantic-speech=\"ZnO\" data-semantic-type=\"","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"636 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144371091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of medium voltage single-phase solid-state transformer for high-speed railway vehicles: Reduced scale verification results","authors":"Dong-Uk Kim, Jin-Hyuk Park, Seung-Hwan Lee, Sungmin Kim","doi":"10.1049/hve2.70061","DOIUrl":"https://doi.org/10.1049/hve2.70061","url":null,"abstract":"This paper presents a high-power-density solid-state transformer (SST) designed for 25 kV alternative current railway applications, delivering a 3 kV direct current output to traction inverters. The SST is composed of sub-modules with the adoption of 1.7 kV insulated gate bipolar transistor and SiC metal oxide field effect transistor (MOSFET) in an input-series–output-series structure, providing higher power density than conventional topologies that rely on high-voltage switches (>1.7 kV). Because these high-voltage SiC MOSFETs are still expensive and not fully commercialised, the proposed approach offers a more cost-effective alternative. A total of 42 converter cells ensures a highly modular and scalable design, with precise synchronisation and high-speed control achieved through an EtherCAT-based communication network. Additionally, a distributed control algorithm is introduced, mitigating excessive dependence on the communication link for module-level operations. The effectiveness of the entire system—including the design and control schemes—has been experimentally verified, ranging from individual converter cells to a reduced SST prototype of up to three sub-modules. These results confirm the feasibility and advantages of the proposed SST in terms of power density, cost efficiency and reliability for railway traction applications.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"639 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144371010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detection of trace CF4 in C4F7N-insulated gas-insulated metal-enclosed switchgear: Cascading specific chemical reactions with photoacoustic spectroscopy","authors":"Zhicheng Wu, Jiahao Du, Zehao Zhang, Xiang Li, Shengjin Wang, Xiaoang Li, Qiaogen Zhang","doi":"10.1049/hve2.70049","DOIUrl":"https://doi.org/10.1049/hve2.70049","url":null,"abstract":"CF₄ is a major decomposition product of the insulating gas in C₄F₇N-insulated gas-insulated metal-enclosed switchgear (GIS) during partial discharge or overheating faults. Its detection is essential for effective online monitoring and fault diagnosis of GIS. However, the application of photoacoustic spectroscopy for CF₄ detection is hampered by significant cross-interference from the background C₄F₇N gas. In this paper, quantum chemical calculations revealed that C₄F₇N hydrolyses to form perfluoroisobutyrate and ammonia under base catalysis, exhibiting a low reaction energy barrier and high Gibbs free energy change, indicating ease of initiation and substantial reaction extent. This chemical specificity, unlike the stable CF₄ which does not undergo such a reaction, enables selective purification of the gas to be detected through this hydrolysis reaction. Leveraging this insight, an experimental system was constructed that cascades chemical absorption purification with photoacoustic spectroscopy detection, and by selectively absorbing C₄F₇N through a base catalysed nucleophilic hydrolysis reaction to achieve over 95% efficiency, effectively mitigating the cross-interference of C₄F₇N in CF₄ detection. This enabled the precise detection of trace amounts of CF₄ against a substantial background of C₄F₇N with a detection limit reaching 14.79 μL/L. This advancement offers support for the online monitoring and fault diagnosis of eco-friendly GIS.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"45 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cumulative degradation of electrical properties in polypropylene insulation for AC cables under repeated impulse voltage stress","authors":"Yunpeng Zhan, Shuai Hou, Mingli Fu, Lingmeng Fan, Binjie Zhang, Kai Yu, Xiaolei Zhao, Yi Yin","doi":"10.1049/hve2.70050","DOIUrl":"https://doi.org/10.1049/hve2.70050","url":null,"abstract":"In modern power transmission systems, AC cables are increasingly integrated with overhead lines, forming hybrid networks. These cables are frequently exposed to repeated impulse voltages from the overhead lines. While surge arresters offer partial protection, the long-term effects of these impulses on polypropylene (PP) insulation remain unclear. This study systematically investigates the cumulative degradation of the electrical breakdown properties of PP insulation under repeated impulse voltage stress. The 50% impulse breakdown voltage (<i>U</i>₅₀) was first determined, and a series of impulse tests were conducted at varying voltage levels to assess the number of impulses required for electrical breakdown, leading to the construction of an amplitude of impulse voltage (<i>U</i>) and the number of times required for breakdown (<i>N</i>), which is <i>U</i>–<i>N</i> curve. To evaluate the cumulative degradation, impulse voltage at 0.8 <i>U</i>₅₀ was applied for 50, 100, and 200 cycles, with the electrical conductivity current measured before and after each series of impulses. The results indicate significant degradation in the insulating properties of PP under repeated impulse stress. Mechanisms of cumulative degradation under impulse stress were further explored using isothermal relaxation current and space charge measurements. These findings provide critical insights into the performance of PP in hybrid transmission systems and offer valuable data to inform improved insulation design and protection strategies.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"15 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Control strategy of novel hybrid commutated converter based on reverse blocking integrated gate commutated thyristor for commutation failure mitigation","authors":"Zongze Wang, Zhanqing Yu, Lu Qu, Zhichang Yuan, Kangsheng Cui, Jian Shi, Biao Zhao, Rong Zeng","doi":"10.1049/hve2.70047","DOIUrl":"https://doi.org/10.1049/hve2.70047","url":null,"abstract":"Commutation failure (CF) is an inherent problem faced by line commutated converter high voltage direct current (LCC-HVDC) technology. To completely solve the problem of CF, we have proposed a novel hybrid commutated converter (HCC) technology based on reverse blocking integrated gate commutated thyristor, which can utilise two methods for commutation: enhanced grid voltage commutation and active turn-off forced commutation. In this paper, the topology and operating principle of HCC are proposed. Then, the control and protection strategy is designed based on the current variation trend under AC faults. To verify the effectiveness of HCC in mitigating CF, a 120-kV/360-MW HCC-HVDC model is built in PSCAD/EMTDC, adopting LCC at the rectifier side and HCC at the inverter side. Based on this model, HCC steady-state and fault transient stresses are analysed. Various AC faults are simulated and the performance of HCC-HVDC is compared with LCC-HVDC. Finally, the results show that the HCC topology and proposed control strategy can solve CF under all fault conditions with almost the same attributes as LCC, such as large capacity, low cost, low loss and high reliability, which is meaningful for the application of HCC to the HVDC transmission system.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"7 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Guest Editorial: Equipment technology of power transmission and distribution supporting the new-type power system","authors":"Marcio Szechtman","doi":"10.1049/hve2.70062","DOIUrl":"https://doi.org/10.1049/hve2.70062","url":null,"abstract":"<h2>1 INTRODUCTION</h2>\u0000<p>The new-type power system, with a strong, intelligent and flexible grid as its hub platform, is a key carrier for achieving the goals of carbon peak and carbon neutrality. Among them, AC/DC transmission and distribution equipment is the core for achieving power conversion and transmission. In order to adapt to the high proportion of new energy, large-scale energy storage, and diversified flexible load, and to promote the high-quality construction of the new-type power system, it is urgent to carry out research and development on flexible and intelligent new transmission and distribution equipment.</p>\u0000<p>This Special Issue aims to foster academic exchanges and advance theoretical research in the areas related to the equipment technology of power transmission and distribution, in conjunction with the outstanding papers selected by the 20th IET International Conference on AC and DC Power Transmission. The call for the Special Issue comprises two sections: materials and devices of AC/DC power transmission and distribution systems, and equipment of AC/DC power transmission and distribution systems.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"32 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detection of Transient Decomposition Products of CF3SO2F and C4F7N via OES Under Spark and Glow Discharges","authors":"Chenxi Man, Jincong Wang, Keli Gao, Yiheng Li, Yumin Zhang, Xuekai Pei","doi":"10.1049/hve2.70039","DOIUrl":"https://doi.org/10.1049/hve2.70039","url":null,"abstract":"The optical emission spectra (OES) reflect the presence of excited states in the gaseous discharge, which are directly linked to the decomposition characteristics of insulating gases. In this study, a pin/rod–plate discharge reactor driven by either a high-voltage direct current (DC) generator or a pulsed generator was developed to establish an effective platform for generating decomposition products of &lt;span data-altimg=\"/cms/asset/c37d5c2b-5870-40ea-94e9-a4dfb7870fa0/hve270039-math-0001.png\"&gt;&lt;/span&gt;&lt;mjx-container ctxtmenu_counter=\"329\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"&gt;&lt;mjx-math aria-hidden=\"true\" location=\"graphic/hve270039-math-0001.png\"&gt;&lt;mjx-semantics&gt;&lt;mjx-mrow data-semantic-annotation=\"clearspeak:unit\" data-semantic-children=\"2,5,6\" data-semantic-content=\"7,8\" data-semantic- data-semantic-role=\"implicit\" data-semantic-speech=\"CF Subscript 3 Baseline SO Subscript 2 Baseline normal upper F\" data-semantic-type=\"infixop\"&gt;&lt;mjx-msub data-semantic-children=\"0,1\" data-semantic- data-semantic-parent=\"9\" data-semantic-role=\"unknown\" data-semantic-type=\"subscript\"&gt;&lt;mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"2\" data-semantic-role=\"unknown\" data-semantic-type=\"text\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mtext&gt;&lt;mjx-script style=\"vertical-align: -0.15em;\"&gt;&lt;mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"2\" data-semantic-role=\"integer\" data-semantic-type=\"number\" size=\"s\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mn&gt;&lt;/mjx-script&gt;&lt;/mjx-msub&gt;&lt;mjx-mo data-semantic-added=\"true\" data-semantic- data-semantic-operator=\"infixop,⁢\" data-semantic-parent=\"9\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" style=\"margin-left: 0.056em; margin-right: 0.056em;\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mo&gt;&lt;mjx-msub data-semantic-children=\"3,4\" data-semantic- data-semantic-parent=\"9\" data-semantic-role=\"unknown\" data-semantic-type=\"subscript\"&gt;&lt;mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"unknown\" data-semantic-type=\"text\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mtext&gt;&lt;mjx-script style=\"vertical-align: -0.15em;\"&gt;&lt;mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"integer\" data-semantic-type=\"number\" size=\"s\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mn&gt;&lt;/mjx-script&gt;&lt;/mjx-msub&gt;&lt;mjx-mo data-semantic-added=\"true\" data-semantic- data-semantic-operator=\"infixop,⁢\" data-semantic-parent=\"9\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" style=\"margin-left: 0.056em; margin-right: 0.056em;\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mo&gt;&lt;mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"9\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"&gt;&lt;","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"41 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nano-kaolin enhances the mechanical, electrical, and thermal properties of cellulose insulating paper","authors":"Wenchang Wei, Yuye Zhang, Xuanhao Fu, Shengzhe Yuan, Chenxi Shi, Zhicheng Su, Shihao Luo, Haiqiang Chen, Junwei Zha, Yiyi Zhang","doi":"10.1049/hve2.70041","DOIUrl":"https://doi.org/10.1049/hve2.70041","url":null,"abstract":"There is an extremely urgent demand in the realm of power equipment, including power transformers, motors, and cables. Specifically, there is a pressing need for cellulose-based composite insulating paper that can exhibit high thermal conductivity, superior mechanical properties, and robust insulation characteristics. In response to this demand, this study adopted a ‘simulation-guided experimental research’ methodology. First, based on molecular dynamics (MD) simulations, it was used to construct nano-kaolin (KL)/cellulose composite models with varying contents. Then, according to the simulation results, the corresponding proportions of nano-KL/cellulose insulating paper were prepared. The simulation and experimental findings further reveal a significant effect of nano-KL. To be more precise, nano-KL can effectively fill the microscopic defects and voids within the cellulose structure. Moreover, nano-KL forms an orderly and regular thermal conductivity network in conjunction with cellulose. As a result, this network structure elevates the paper's overall thermal conductivity. Owing to its low-dielectric-loss characteristics, nano-KL reduces the microscopic charge polarisation phenomenon within the composite structure. It curbs the migration of electrons, alleviates the concentration of electric field stress, and ultimately improves the electrical insulation performance of the modified insulating paper. Notably, the 4 wt% nano-KL/cellulose insulating paper exhibits optimal performance, and its tensile strength, thermal conductivity, volume resistivity, dielectric loss, and breakdown strength are 55.81 MPa, 0.201 W·m⁻¹ K⁻¹, 4.58 × 10¹⁵ Ω·m, 0.25%, and 57.81 kV/mm. This study demonstrates MD simulations' feasibility and effectiveness in providing theories and protocols for experiments.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}