High Voltage最新文献

{"title":"Investigation of the Simplified Equivalent Circuit Model of the Post-Arc Sheath Stage in DC Vacuum Circuit Breakers","authors":"Xubin Li,&nbsp;Xingyu Guo,&nbsp;Wen Wang,&nbsp;Xiaoming Liu,&nbsp;Minfu Liao,&nbsp;Jiyan Zou","doi":"10.1049/hve2.70144","DOIUrl":"10.1049/hve2.70144","url":null,"abstract":"<p>This paper presents a simplified equivalent circuit model (ECM) for the post-arc sheath stage in DC vacuum circuit breakers and outlines the method for calculating circuit parameters using the particle-in-cell Monte Carlo collision (PIC-MCC) method. The post-arc sheath is modelled as a parallel combination of a variable resistor and a variable capacitor. Based on a specific DC experimental case, the PIC-MCC simulation provides essential parameters of charged particles and electric field data for calculating equivalent resistance and capacitance. The total current through the circuit components is calculated by applying the transient recovery voltage (TRV), and the resulting post-arc current (PAC) waveform is compared with experimental results to validate the simplified ECM and the proposed parameter calculation approach. Further simulations study the impact of the initial drift velocity of charged particles on equivalent circuit parameters and PAC traces, showing that higher drift velocities increase capacitance and decrease resistance, leading to higher PAC peaks. The comparison with experimental data indicates that considering the drift velocity contributes to the simulation accuracy.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"1011-1020"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70144","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of ± 550 kV DC GIS Basin Insulator","authors":"Shaohua Cao,&nbsp;Chengwei Jing,&nbsp;Siqiong Zhang,&nbsp;Zuodong Liang,&nbsp;Zehao Zhang,&nbsp;Fangwei Liang,&nbsp;Yong Yang,&nbsp;Geng Chen,&nbsp;Jinliang He,&nbsp;Chuanyang Li","doi":"10.1049/hve2.70164","DOIUrl":"10.1049/hve2.70164","url":null,"abstract":"<p>The basin insulator is a core component of the insulation system for ± 550 kV gas-insulated switchgear (GIS). This paper, using a finite element method for multi-physics simulations of electric–thermal coupling, determines a geometry suitable for the industrial production of ± 550 kV GIS basin insulators. Results show that, as the temperature increases, the source of charge accumulation on the convex surface of the insulator shifts from conduction current on the gas side to conduction current within the insulator. Surface potential under temperature gradients presents an absolute surface potential value below 5 kV. Mechanical performance tests, as well as electrical tests—including polarity reversal, DC superimposed impulse tests and a three-month long-term DC duration test at 1.5 times the rated voltage—were conducted. The developed ± 550 kV GIS basin insulator passed all the tests.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"1068-1077"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70164","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147536634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Micro Partial Discharge Characteristics of SF6 Under DC Voltage","authors":"Geng Chen,&nbsp;Jie Wang,&nbsp;Chuanyang Li,&nbsp;Cong Wang,&nbsp;Youping Tu","doi":"10.1049/hve2.70132","DOIUrl":"10.1049/hve2.70132","url":null,"abstract":"<p>In gas-insulated high-voltage direct current (HVDC) devices, micro partial discharges (PD) caused by micro-protrusions or surface roughness on conductors or enclosures  may not cause immediate insulation system failure due to their weak discharge intensity. However, the continuous charging of carriers generated by the discharges to the insulator is one of the potential triggers of surface flashover of insulators. This work investigates the micro PD characteristics in SF₆ at 0.1–0.7 MPa, which is below the lower limit of conventional detection methods, via a highly sensitive micro-discharge measurement platform. The experimental results show that the micro PD exhibits a strong polarity effect. With increasing pressure, the mean amplitude and mean repetition rates exhibited an extremum at 0.3 MPa. As the applied voltage increased, the mean amplitude shifted from negative polarity dominance over positive polarity to positive polarity dominance over negative polarity. Time-resolved PD (TRPD) and pulse sequence analysis (PSA) patterns indicate that the micro PD is characterised by clustered bursts and amplitude stratification. Furthermore, the negative polarity micro PD is more stable than the positive polarity counterpart. The results of this work can provide references to guide the optimized design of gas-insulated HVDC devices.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"1058-1067"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70132","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146110313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic Modal-Based Vibration Characteristics Analysis and Looseness Fault Diagnosis in Transformer Winding","authors":"Shuyu Wu,&nbsp;Chao Zhang,&nbsp;Fan Zhang,&nbsp;Shengchang Ji","doi":"10.1049/hve2.70197","DOIUrl":"10.1049/hve2.70197","url":null,"abstract":"<p>Limited by the theoretical basis and diagnostic methods, the winding mechanical condition monitoring often requires both normal condition vibration signals and present vibration signals, and the winding mechanical condition identification is completed by comparing with the normal condition signals. This paper proposes a method to diagnose winding looseness faults without the need for normal condition vibration data based on the established dynamic modal model (DMM). Starting from the vibration mechanism, the DMM of the winding is established, and the mutual coupling relationship between the dynamic modal (DM) and vibration is clarified. Then, a numerical method is used to simulate the variation pattern of the winding natural frequency under the influence of the DM; an experimental method is used to study the difference between the frequency response curve under the influence of the DM and the frequency response curve of the static modal (SM). According to the above research results, the phenomenon of vibration deviation under the same mechanical condition and the identical excitation is revealed. Finally, taking into full consideration the characteristics of vibration deviation and changes in vibration itself under the effect of the DM, a diagnostic method for identifying winding looseness faults without the need for normal condition signals is proposed. The research results provide a practical solution for identifying the mechanical condition of the winding in the absence of normal condition data.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"1078-1089"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70197","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147755186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Thermal-Dependent Conductivity Coating for Surface Charge and Electric Field Mitigation Under Electrothermal Coupling Field","authors":"Jianyi Xue,&nbsp;Bowen Xing,&nbsp;Weiming Wang,&nbsp;Jianzhao Sang,&nbsp;Ning Yang,&nbsp;Tao Wen,&nbsp;Lijian Ding","doi":"10.1049/hve2.70189","DOIUrl":"https://doi.org/10.1049/hve2.70189","url":null,"abstract":"<p>The problem of gas–solid interface charge accumulation is an important reason for distorting the surface electric field and then inducing surface discharge. The temperature gradient distribution formed on the spacer during the operation of a gas-insulated transmission line (GIL) will aggravate the surface charge accumulation, further threatening the surface insulation performance of the spacer. This study proposes a thermal-dependent conductivity coating method to regulate the surface charge and electric field distribution on DC GIL spacers under an electrothermal coupling field. Under the temperature gradient, the symmetrically ring-shaped homocharges around the high-voltage electrode and the randomly cloud-shaped bipolar charges are distributed on the uncoated spacer surface. After coating TiO₂/epoxy mixtures on the spacer surface, the surface charge distribution on the spacer is dramatically homogenised under the thermal gradient, no matter which content of TiO₂ is used. A simulation model for the surface charge and electric field on the spacer with/without TiO₂/epoxy coating under the electrothermal coupling field is established. The results are well consistent with those of the experiment. When the content of TiO₂ in the coating material increases from 10 wt% to 30 wt%, the maximum electric field strength on the spacer surface gradually decreases and tends to be stable, from 2.7 kV/mm on the uncoated spacer surface to 1.1 kV/mm on the 20-wt% TiO₂/epoxy-coated spacer. We hope that this study can provide guidance for the optimal design of DC GIL spacers under the electrothermal coupling field.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"928-938"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70189","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Study on Disintegration Characteristics of Water Droplets in Icicle-Flat Plate Gap Beyond Critical Discharge Voltage","authors":"Lin Yang,&nbsp;Xinyang Gou,&nbsp;Xingkun Hu,&nbsp;Jiabao Ding,&nbsp;Yanpeng Hao,&nbsp;Licheng Li,&nbsp;Hao Li","doi":"10.1049/hve2.70206","DOIUrl":"https://doi.org/10.1049/hve2.70206","url":null,"abstract":"<p>The disintegration behaviour of ice-melting droplets aggravates the discharge risk of ice-covered insulators and the disintegration characteristics of droplets at applied voltages exceeding the critical discharge voltage lack in-depth study. This paper takes the icicle-flat plate model as the research object and experimentally explores the characteristics of the disintegration of the ice-melting droplets beyond critical discharge voltage. The results show that the droplet disintegration critical length shows a trend of shortening slowly and then sharply with the increase of applied voltage. The fine-flow jet after the formation of the Taylor cone causes a sudden reduction in the disintegration critical length. The disintegration position of the droplet gradually moves downward with the increase of applied voltage and then suddenly moves upward. The internal particles in the liquid line of the droplet cause a seepage effect, which makes the weak point of the droplet disintegration move down continuously. At higher electric field strengths, most droplets detach as a whole, causing a sudden upward shift in the disintegration location. The droplet disintegration critical growth rate increases with the applied voltage. The jetting of droplets under stronger electric field forces leads to a sharp rise in the growth rate.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"1048-1057"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70206","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148860096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modelling the Four-Dimensional Power Line Sag Dynamics by Point Signature in Time-Series Synthetic-Aperture Radar Images","authors":"Sijie Ma,&nbsp;Tao Li,&nbsp;Mahdi Motagh,&nbsp;Yan Liu,&nbsp;Yangmao Wen","doi":"10.1049/hve2.70188","DOIUrl":"10.1049/hve2.70188","url":null,"abstract":"<p>Power lines in synthetic-aperture radar (SAR) images are reflected as point signatures, which fluctuate annually in both the azimuth and range directions. A novel framework is proposed in this paper to evaluate the four-dimensional dynamic status of power line sag using those point signatures in time-series SAR images. An inversion model is proposed to reconstruct the three-dimensional power line sag profile based on the point signature positions and power line suspension points in the SAR coordinates. By combining the elevation function and the power line parabolic function derived in the SAR image, the 3D geometry of power line sag can be reconstructed using the range–Doppler model. A sag–temperature model is proposed to evaluate the 4D dynamic status of power lines in time-series SAR images. The results show that the proposed model has been able to identify one of the power line sag failure events in the study area, which occurred around September 2016, with an approximate 2.54-m line sudden sag downward. This case study shows the potential of spaceborne SAR for real-time power line sag monitoring, particularly under extreme weather conditions.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"1090-1101"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70188","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147523931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimised Molecular Traps and Conjugated Structures for Superior High-Temperature Capacitive Performance in Polyimide","authors":"Xue Li,&nbsp;Ling Weng,&nbsp;Li Kong,&nbsp;Xiaoming Wang,&nbsp;Houyu Wang,&nbsp;Ze Li,&nbsp;Yuhan Li,&nbsp;Xiaorui Zhang,&nbsp;Lizhu Guan,&nbsp;Zijian Wu","doi":"10.1049/hve2.70204","DOIUrl":"https://doi.org/10.1049/hve2.70204","url":null,"abstract":"<p>In the fields of automotive electronics, power electronics, and aerospace, environmental conditions are often extremely harsh, particularly for materials that must endure high temperatures, high power and require high stability. The degradation of capacitance performance in polymer dielectrics under high electric fields and elevated temperatures is primarily attributed to the decrease in breakdown strength. To address this, a synergistic strategy combining molecular traps with adjustments to the conjugated structure has been developed to enhance the high-temperature breakdown strength of polymer dielectrics. To address this, we developed a synergistic strategy combining molecular traps with conjugated structure modulation. Experimental and theoretical analyses reveal that polar groups induce deep electron traps via electrostatic interactions, whereas long-chain flexible groups disrupt the conjugation, which alters charge transport mechanisms. Between aromatic rings in the molecular chain, altering the conductivity mechanism. Furthermore, dihedral angle adjustment regulates trap-hopping distances, enhancing high-temperature breakdown strength. As a result, the combined effects of electronic traps and conjugated structure optimisation lead to a discharge energy density of 7.87 J/cm³ at room temperature and 5.99 J/cm³ at 200°C, which is 60% higher than that of OD–PM. This performance surpasses most current polymer dielectrics. Our work establishes a molecular design framework to advance high-temperature capacitive energy storage in polyimides, with direct relevance to harsh-environment applications.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"916-927"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70204","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Post-Arc Transient Dielectric Recovery Characteristics of Vacuum Interrupter in the Large-Capacity Generator Circuit Breaker","authors":"Xiangyu Han,&nbsp;Fei Yang,&nbsp;Yili Chen,&nbsp;Yunqi Wang,&nbsp;Chenle Zhai,&nbsp;Xuliang Zhao,&nbsp;Zhaowei Diao,&nbsp;Yi Wu,&nbsp;Mingzhe Rong","doi":"10.1049/hve2.70153","DOIUrl":"10.1049/hve2.70153","url":null,"abstract":"<p>Large-capacity generator circuit breaker (GCB) based on vacuum interrupter technology is the key power equipment to ensure the safe operation of the power system. When the short-circuit current was forced to cross zero, the large-capacity GCB was difficult to generate a zero-voltage environment through freewheeling, the vacuum interrupter (VI) would immediately withstand the transient recovery voltage (TRV), and there was a lack of research on the post-arc transient dielectric recovery characteristics. First, an experimental platform for transient dielectric recovery characteristics was built, which was capable of generating TRV quickly after current-zero with the voltage rise rate (d<i>u</i>/d<i>t</i>) of about 20 kV/μs. The large current post-arc dielectric recovery tolerance experiments with the peak current of 100 kA were carried out, and the post-arc tolerance process was divided into three modes according to the TRV waveform. The influence of arcing time, residual current and current change rate (d<i>i</i>/d<i>t</i>) on the transient dielectric recovery characteristics was investigated. Next, we found that the transient dielectric recovery of VI under the same conditions was characterised by dispersion. The influence mechanisms of ‘active regulation of the vacuum arc’ and ‘consistency of the arcing process’ on the dispersion of the transient dielectric recovery were studied in detail. The ‘safety boundary’ consisting of the minimum of dielectric recovery strength was analysed, and the optimal arcing control strategy was proposed. The design basis of the circuit breaker was obtained. Finally, a prototype GCB based on vacuum six-breakers in parallel and current transfer was developed, and the large short-circuit current had been successfully broken, which verified the post-arc transient breaking reliability of the VI. The conclusions will lay the foundation for the engineering application of high-capacity GCB.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"999-1010"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70153","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146169567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrical Breakdown Analysis of Emerging Oil–Paper Insulation Systems","authors":"Yue Xu,&nbsp;Soori Tejaswi,&nbsp;Kent Davey,&nbsp;Qian Zhang,&nbsp;Vaibhav Bahadur,&nbsp;Junyong Zhu,&nbsp;Robert Hebner,&nbsp;Zhedong Han,&nbsp;Felix Lin,&nbsp;Liangbing Hu","doi":"10.1049/hve2.70181","DOIUrl":"10.1049/hve2.70181","url":null,"abstract":"<p>This investigation addresses the effect of particulate additives on the electrical breakdown strength of the oil impregnated insulation paper system. The morphological complexity is addressed by converting data from scanning electron microscope images to a data set suitable for numerical simulation analysis. Then, by using the conventional oil-triggered breakdown assumption, the breakdown strength of the proposed hybrid insulation system was calculated. As a result, it demonstrates that the introduction of particles can redefine the electric field distribution in the hybrid insulation system under study. Consequently, a higher applied voltage is needed for the electrical breakdown to occur in the hybrid system with proper selection and addition of particles. This analysis method builds on the existing understanding of the electrical breakdown phenomena for oil impregnated insulation paper system, explains recent experimental data and supports improvements of material design in the future.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"11 4","pages":"965-974"},"PeriodicalIF":5.7,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70181","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147664260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}