High Voltage最新文献_第2页

GSLI-RTMdet: An automatic nondestructive detection method for internal defects in gas-insulated switchgear X-DR images GSLI-RTMdet：气体绝缘开关柜X-DR图像内部缺陷的自动无损检测方法

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-06-09 DOI: 10.1049/hve2.70044

Guote Liu, Zhihao Su, Bing Luo, Yongxuan Zhu

{"title":"GSLI-RTMdet: An automatic nondestructive detection method for internal defects in gas-insulated switchgear X-DR images","authors":"Guote Liu, Zhihao Su, Bing Luo, Yongxuan Zhu","doi":"10.1049/hve2.70044","DOIUrl":"https://doi.org/10.1049/hve2.70044","url":null,"abstract":"Accurately identifying the location and type of internal defects in gas-insulated switchgear (GIS) is a challenge. To address this challenge, this study proposes a novel method for the nondestructive detection of GIS internal defects. This method is based on x-ray digital radiography (X-DR) technology and an improved real-time models for object detection (RTMdet) algorithm, namely GIS-specific localised internal defect-RTMdet. Firstly, the X-DR images of GIS are preprocessed by dynamic limit adaptive histogram equalisation algorithm to improve the images contrast. Then, a convolution shuffle upsample module for upsampling is proposed, which enlarges the defect feature map by multi-convolution and pixel shuffling, reduces the information loss, and enhances the interaction between the feature information. Finally, both the multi-channel attention net and the global attention mechanism are integrated into the neck network for enhancing local feature extraction and global information association. Experiments demonstrate that the proposed method achieves a mean average precision @0.5:0.95 of 94.9%, showcasing excellent overall performance and generalisation ability, and is more suitable for accurate nondestructive detection of internal defects of GIS in complex scenarios.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"12 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260764","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}

引用次数: 0

Impact of Component Structure on Vibration and Noise of Converter Transformers Under Harmonic Excitation 谐波励磁下换流变压器部件结构对振动和噪声的影响

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-06-07 DOI: 10.1049/hve2.70027

Hao Wang, Li Zhang, Youliang Sun, Liang Zou

引用次数: 0

Improved high-temperature electrical properties of polypropylene insulation material by grafting styrene 接枝苯乙烯改善聚丙烯绝缘材料的高温电性能

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-06-05 DOI: 10.1049/hve2.70058

Xinhua Dong, Qing Shao, Yuanbo Cai, Qi Zhang, Wenjia Zhang, Shixun Hu, Shangshi Huang, Wei Wang, Qi Li, Jinliang He

{"title":"Improved high-temperature electrical properties of polypropylene insulation material by grafting styrene","authors":"Xinhua Dong, Qing Shao, Yuanbo Cai, Qi Zhang, Wenjia Zhang, Shixun Hu, Shangshi Huang, Wei Wang, Qi Li, Jinliang He","doi":"10.1049/hve2.70058","DOIUrl":"https://doi.org/10.1049/hve2.70058","url":null,"abstract":"The electrical properties of polypropylene (PP) insulation material decrease dramatically at high temperature, which limits its application in harsh environments. This study investigates how grafting styrene (St) improves the high-temperature electrical properties of PP. Compared with pure PP, the space charge of the St-grafted PP (PP-g-St) samples is suppressed, the volume resistivity is significantly improved, and the breakdown strength at room temperature (30°C) and high temperature (90 and 110°C) is increased by 35.04%, 36.98% and 34.86%, respectively. The results show that the side chains generated by grafted St can increase the number of spherulites and improve the crystallinity, making the boundaries of the spherulites tortuous and narrow, which is not conducive to the formation of low-density regions. At the same time, because of the entanglement of grafted side chains and the presence of deep traps inside the PP-g-St samples, which inhibit the injection and migration of carriers, the effect of high temperature on the free volume is weakened. Consequently, the ability to capture charges at high temperature is enhanced, leading to an improvement in the high-temperature electrical properties of PP. This research can provide a reference for the development of high-performance grafted PP insulation materials.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"17 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260767","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}

引用次数: 0

Laser Diode-in-Capacitors for High-Voltage Line Non-Contact Monitoring: Voltage, Electromagnetic Interference and Vibration Monitoring 高压线路非接触监测用激光二极管电容器：电压、电磁干扰和振动监测

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-06-05 DOI: 10.1049/hve2.70010

Pengpeng Wang, Wei Huang, Hao Su, Junlong Li, Biao Xie, Jiawen Qiu, Baoran Shi, Yongai Zhang, Xiongtu Zhou, Tailiang Guo, Chaoxing Wu

{"title":"Laser Diode-in-Capacitors for High-Voltage Line Non-Contact Monitoring: Voltage, Electromagnetic Interference and Vibration Monitoring","authors":"Pengpeng Wang, Wei Huang, Hao Su, Junlong Li, Biao Xie, Jiawen Qiu, Baoran Shi, Yongai Zhang, Xiongtu Zhou, Tailiang Guo, Chaoxing Wu","doi":"10.1049/hve2.70010","DOIUrl":"https://doi.org/10.1049/hve2.70010","url":null,"abstract":"Power grid is an indispensable infrastructure in modern society, in order to ensure the normal operation of the grid, online non-contact monitoring of high-voltage lines is essential. In this work, a ‘capacitor–laser diode (LD)–capacitor’ structure, namely, laser diode in capacitors (LDIC), that can be used for non-contact monitoring of high-voltage (HV) line status by directly transferring the status information of the HV line to modulated laser pulses is proposed. The proposed LDIC can accurately extract the real-time voltage changes on the HV line with an accuracy level of 0.959%. Because the LDIC is sensitive to high-frequency electromagnetic field, the LDIC is successfully utilised to detect the external electromagnetic interference (EMI) to obtain the intensity and frequency of the external EMI. Additionally, the amplitude and frequency of the HV line vibration can be accurately monitored by using the LDIC. For the third-order curve fitting of vibration amplitude, the average error is only 0.00867, and the average error of linear fitting of vibration frequency is as low as 0.00655. This work provides a novel approach for the online monitoring of the HV line status and a new supplement for the development of power grid technology.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"36 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260798","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}

引用次数: 0

Simulation of Hollow-Core Photonic Crystal Fibre-Based Photothermal Spectral C2H2 Gas Sensor 基于空心光子晶体光纤的光热光谱C2H2气体传感器的仿真

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-06-05 DOI: 10.1049/hve2.70028

Fuping Zeng, Xianzong Chao, Xinghai Jiang, Yanfeng Xiao, Qiang Yao, Ju Tang

{"title":"Simulation of Hollow-Core Photonic Crystal Fibre-Based Photothermal Spectral C2H2 Gas Sensor","authors":"Fuping Zeng, Xianzong Chao, Xinghai Jiang, Yanfeng Xiao, Qiang Yao, Ju Tang","doi":"10.1049/hve2.70028","DOIUrl":"https://doi.org/10.1049/hve2.70028","url":null,"abstract":"Fault characteristic gas analysis is one of the important methods for monitoring the operating status of power equipment. This study presents the construction of a simulation model for a hollow-core photonic crystal fibre (HC-PCF)-based photothermal spectroscopy gas detection system. The relationship between the phase change of the probe beam and the acetylene concentration, pump power, ambient temperature and the modulation frequency is examined. It is achieved by simulating the wavelength modulation of the pump beam and the phase change of the probe beam. The findings demonstrate that there is a linear positive correlation between the pump power and the amplitude of the phase change of the probe beam and the acetylene concentration. For example, acetylene concentration grew from 1 to 10,000 ppm, whereas phase change amplitude increased from 4.71 × 10−4 to 3.70 rad. The pump power grew from 7 to 2000 mW, whereas phase change amplitude increased from 3.73 × 10−4 to 1.01 × 10−1 rad. The phase change of the probe beam is non-linearly and negatively correlated with the ambient temperature. The ambient temperature decreases from 373.15 to 173.15 K, and phase change amplitude increases from 5.05 × 10−3 to 2.15 × 10−2 rad, an enhancement of 4.26 times. The modulation frequency is needed to balance the thermal conduction process in the HC-PCF. In the 1–100 Hz range, the amplitude of the phase change is stable and almost independent of the modulation frequency. In the 100–40,000 Hz range, the amplitude of the phase change decreases rapidly with the increase of the modulation frequency. The results of the paper provide a reference for constructing the HC-PCF-based photothermal spectroscopy gas detection system.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"17 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260799","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}

引用次数: 0

Separation Maps for Classification of Multiple Partial Discharges: A Comparative Study Focusing on Time and Frequency Characteristics 多局部放电分类的分离图：基于时频特性的比较研究

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-05-30 DOI: 10.1049/hve2.70032

Jannery Rivas, Omar Rivera-Caballero, Héctor Poveda, Jorge Alfredo Ardila-Rey, Carlos Boya-Lara

{"title":"Separation Maps for Classification of Multiple Partial Discharges: A Comparative Study Focusing on Time and Frequency Characteristics","authors":"Jannery Rivas, Omar Rivera-Caballero, Héctor Poveda, Jorge Alfredo Ardila-Rey, Carlos Boya-Lara","doi":"10.1049/hve2.70032","DOIUrl":"https://doi.org/10.1049/hve2.70032","url":null,"abstract":"Electrical insulation faults produce partial discharges (PD), which can be analysed to identify specific types of defects. PD clustering is a widely used method to identify PD sources, although its success depends largely on the feature maps used. In this paper, three widely used feature maps, or separation maps, are compared: chromatic, energy wavelet with principal component analysis (EW-PCA), and time–frequency (TF). To compare and evaluate, five scenarios with multi-PD environments with noise were developed. The clustering ability of the maps was evaluated using two performance indicators: intercluster distance and intracluster distance. The results indicate that the EW-PCA map performed the best in all scenarios, correctly identifying the largest number of data points and producing the clearest and most distinct clusters. The TF map created distinct clusters in several scenarios, but not all. The chromatic map created distinct clusters in all scenarios but was not as well defined as the other two separation maps. Given the results, it is important in fieldwork to use a wide range of PD clustering, accompanied by performance metrics that support a less biased decision tailored to the test object.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"29 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189018","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}

引用次数: 0

Partial Discharge Localisation in Power Transformer by UHF Technique 用超高频技术定位电力变压器局部放电

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-05-27 DOI: 10.1049/hve2.70022

Mohammad Amin Jangjoo, Mehdi Allahbakhshi, Hassan Reza Mirzaei, Ali Abooee

{"title":"Partial Discharge Localisation in Power Transformer by UHF Technique","authors":"Mohammad Amin Jangjoo, Mehdi Allahbakhshi, Hassan Reza Mirzaei, Ali Abooee","doi":"10.1049/hve2.70022","DOIUrl":"https://doi.org/10.1049/hve2.70022","url":null,"abstract":"This article deals with the methods of finding partial discharge (PD) location in power transformers using ultra high frequency (UHF) measurements. The UHF technique utilises two methods to find the PD location, that is, the shortest path method and hyperbolic method. The shortest path method works based on the comparison of the measured data and the ones in the database. In the hyperbolic method, a hyperbolic equation is obtained between each two element subset of sensors. The coordinate that best fits all equations is known as the PD location, and can be obtained in three different ways, that is, iterative algorithms, the Fang method and Chan method. The convergence of iterative algorithms is limited by poor initial estimate, overshoot, mitigation of non-convergence etc. The Fang and Chan methods are two closed-form solutions that are used in the communication system to find the radiation source location. This article explains how to use these two methods to obtain the PD coordinate inside the power transformer. These two methods can find exactly the coordinate that best fits all hyperbolic equations. At the end of this article, several tests are carried out through CST software and the PD locations is estimated by all presented methods. The simulation results show how the Fang and Chan methods can overcome the limitations of the iterative method.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"6 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177087","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}

引用次数: 0

Preparation Method and Performance Study of Nanocellulose/Epoxy Resin Composite Materials Modified by Multiple Approaches 多途径改性纳米纤维素/环氧树脂复合材料的制备方法及性能研究

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-05-22 DOI: 10.1049/hve2.70017

Daning Zhang, Xinyuan Feng, Jiongting Jiang, Tianbo Zhang, Zhi Yang, Guan-Jun Zhang

{"title":"Preparation Method and Performance Study of Nanocellulose/Epoxy Resin Composite Materials Modified by Multiple Approaches","authors":"Daning Zhang, Xinyuan Feng, Jiongting Jiang, Tianbo Zhang, Zhi Yang, Guan-Jun Zhang","doi":"10.1049/hve2.70017","DOIUrl":"https://doi.org/10.1049/hve2.70017","url":null,"abstract":"Nanocomposites are pivotal for enhancing epoxy resin performance, but traditional inorganic nanofillers' poor compatibility and nonrecyclability pose environmental concerns. This study utilises recyclable organic cellulose nanocrystals (CNC) to explore their modification impact on epoxy composite properties. Through infrared spectroscopy and X-ray photoelectron spectroscopy (XPS), the degree of modification for CNC and its derivatives—KH560-modified CNC (KH560-CNC) and methyl methacrylate-modified CNC (MMA-CNC)—was assessed. Scanning electron microscope (SEM) performance characterisation of modified CNC/epoxy composites showed that higher CNC modification levels significantly improve the toughness of the composites. Regarding thermal conductivity, modified CNCs affected the epoxy composites differently; KH560-CNC/EP exhibited the best thermal conductivity at low filler concentrations, whereas MMA-CNC/EP showed higher thermal conductivity at high concentrations. Additionally, nanocellulose's varying degrees of modification differently impacted the composites' moisture absorption and dielectric properties. The higher the CNC modification level, the stronger its moisture absorption capability, with minimal effect on dielectric loss. This paper provides experimental evidence for CNC/epoxy composite applications, offering practical guidance for future design and manufacturing of epoxy resin composites.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"20 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144122697","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}

引用次数: 0

Analysis of vibration evolution and propagation characteristics due to mechanical degradation in transformer iron cores 变压器铁芯机械退化引起的振动演化与传播特性分析

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-05-15 DOI: 10.1049/hve2.70035

Yunpeng Liu, Guanyu Chen, Fuseng Xu, Tao Zhao, Hongliang Liu, Lu Sun

{"title":"Analysis of vibration evolution and propagation characteristics due to mechanical degradation in transformer iron cores","authors":"Yunpeng Liu, Guanyu Chen, Fuseng Xu, Tao Zhao, Hongliang Liu, Lu Sun","doi":"10.1049/hve2.70035","DOIUrl":"https://doi.org/10.1049/hve2.70035","url":null,"abstract":"This study investigates vibration changes due to transformer core deterioration by monitoring core vibration, compression force and shell wall vibrations simultaneously. The transformer core operates in a compound environment of mechanical vibration and thermal ageing for extended periods, and the correlation mechanism between core structural deterioration and shell vibration changes remains unclear. This study first derives and analyses the propagation mechanism of core vibration in oil. The experiments simulate the internal deterioration of a 10 kV transformer using pressure sensors to monitor the compression force on the core and windings and vibration sensors on the internal upper yoke and the enclosure to capture full vibration measurements. Analysis of the vibration data during the experiment, using two quantitative indicators—vibrational entropy and fundamental frequency weight—reveals that measurement point #2 (on the outer case wall corresponding to the internal upper yoke) shows a value approximately 1.2 times that of the internal upper yoke. However, measurement point #5 (located away from the upper yoke near the windings) demonstrates a value about 2.3 times that of the internal upper yoke. The results indicate that measurement point #2 has high vibration consistency with the internal upper yoke, whereas it exhibits significant variability compared to measurement point #5. To validate these findings, researchers collected 24-h vibration data from 105 in-service 220 kV transformers and the results aligned with those from the experimental platform. This study quantitatively addresses the changes in case vibration characteristics caused by core degradation and proposes a novel method for detecting the mechanical state of transformer cores through vibration analysis.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"17 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083390","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}

引用次数: 0

Development of 3 kV Low-Frequency Induction Voltage Divider Using Two-Stage Excitation 两级励磁3kv低频感应分压器的研制

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-05-15 DOI: 10.1049/hve2.70015

Xuan Li, Jiang Guo, Jiangang Bi, Hui Li

{"title":"Development of 3 kV Low-Frequency Induction Voltage Divider Using Two-Stage Excitation","authors":"Xuan Li, Jiang Guo, Jiangang Bi, Hui Li","doi":"10.1049/hve2.70015","DOIUrl":"https://doi.org/10.1049/hve2.70015","url":null,"abstract":"To address the lack of voltage ratio standards for accuracy testing of low-frequency voltage transformers, it is necessary to develop a 3 kV low-frequency induction voltage divider. Firstly, based on the analysis of the error sources of the induction voltage divider, a method was proposed to calculate the excitation impedance of the induction voltage divider using complex magnetic permeability. A measurement circuit based on the lock-in principle was set up to measure the complex magnetic permeability of grained-oriented silicon steel 30P100 and permalloy 1J85 at different frequencies. Secondly, a 3 kV low-frequency induction voltage divider with a two-stage excitation and a series-wound ratio winding in 10 sections was designed. The errors of the two stages of the instrument transformers were calculated at 20 and 50 Hz, respectively. Finally, the divider's errors were calibrated at 20 and 50 Hz using the reference potential method. The results showed that, compared to 50 Hz, the excitation impedance of the two stages decreased and the errors increased at 20 Hz, with the overall error of the induction voltage divider being better at 50 Hz than at 20 Hz. Experimental measurements indicated that at 20 Hz, the ratio error and phase error of the 3 kV two-stage excitation induction voltage divider were better than 1 × 10−5, whereas at 50 Hz, the errors were better than 1 × 10−6. This study provides support for the accuracy testing of voltage transformers used in low-frequency flexible AC transmission projects.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"32 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083388","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}

引用次数: 0