High Voltage最新文献_第3页

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":"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":"10 3","pages":"632-645"},"PeriodicalIF":4.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70035","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":"OA","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

Improved Prediction Model for the Corrosion of Aluminium Alloy Conductors: Considering the Influence of Electric Field and Dynamic Boundary 改进的铝合金导体腐蚀预测模型：考虑电场和动态边界的影响

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-05-09 DOI: 10.1049/hve2.70023

Hanwei Li, Yuhu Yang, Xiaolai Li, Lin Liu, Fuzhi Wang, Jun Lin, Xingming Bian

{"title":"Improved Prediction Model for the Corrosion of Aluminium Alloy Conductors: Considering the Influence of Electric Field and Dynamic Boundary","authors":"Hanwei Li, Yuhu Yang, Xiaolai Li, Lin Liu, Fuzhi Wang, Jun Lin, Xingming Bian","doi":"10.1049/hve2.70023","DOIUrl":"https://doi.org/10.1049/hve2.70023","url":null,"abstract":"The corrosion problems of high-voltage power transmission conductors typically occur in environments with electric fields. However, current research mainly focuses on atmospheric corrosion of metals with limited attention to the combined effects of electric fields and atmospheric conditions on metal corrosion. This study established a corrosion prediction model that considers the effects of electric fields and dynamic boundaries. Because of the influence of dynamic boundaries, this model can calculate parameters such as corrosion rate, corrosion depth, corrosion product accumulation and ion concentration for metal samples with and without an external electric field. The model is validated through indoor accelerated corrosion tests under low applied electric fields and by using aluminium alloy conductor samples from high electric field regions of actual ± 500 kV power transmission lines. The results indicate that the corrosion rate of aluminium alloys initially increases and then decreases over time. Additionally, the corrosion rate of aluminium alloys under an applied electric field is higher than that without an electric field during the same period. The mechanism of increased corrosion rate is analysed to be that the presence of the electric field accelerates the cathode reaction rate of the electrode. The corrosion rate of the sample increased by about 78% under a lower electric field (0–20 kV/m) and by about 2.75 times under a higher electric field around 2000 kV/m.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"67 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946262","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

Heat Transfer Characteristics of Novel Resin Impregnated Paper Converter Transformer Valve-Side Bushing With Two-Phase Closed Thermosyphon 新型树脂浸渍纸换流变压器阀侧两相闭式热虹吸套管的传热特性

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-05-07 DOI: 10.1049/hve2.70011

Qingyu Wang, Zishi Yang, Wei Hu, Zuoming Xu, Peng Liu, Zongren Peng

{"title":"Heat Transfer Characteristics of Novel Resin Impregnated Paper Converter Transformer Valve-Side Bushing With Two-Phase Closed Thermosyphon","authors":"Qingyu Wang, Zishi Yang, Wei Hu, Zuoming Xu, Peng Liu, Zongren Peng","doi":"10.1049/hve2.70011","DOIUrl":"https://doi.org/10.1049/hve2.70011","url":null,"abstract":"Resin impregnated paper (RIP) converter transformer valve-side bushings are the key equipment in converter stations. Local overheating of the RIP core not only reduces the transmission efficiency but also causes insulation failure of converter transformers. In this paper, a new heat dissipation structure is proposed to improve the temperature distribution homogeneity of the bushing using two-phase closed thermosyphon (TPCT). A test model is developed to determine the optimal working fluid inventory. Then, the temperature distribution of a ± 400-kV RIP converter transformer valve-side bushing with an optimised heat dissipation structure is obtained using the coupled three-dimensional electromagnetic-fluid-thermal numerical simulation method considering multiphase flow and phase change processes. The influence of the new structure on the electric field is analysed. The simulation result is verified by the temperature rise test. The results show that two-phase closed thermosyphon can reduce the maximum temperature of the RIP valve-side bushings and significantly improve the temperature distribution homogeneity.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"25 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946127","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

Enhancing Corrosion Resistance of Copper for C4F7N Based Eco-Friendly Gas-Insulated Equipment 提高C4F7N基环保气体绝缘设备中铜的耐腐蚀性能

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-05-06 DOI: 10.1049/hve2.70018

Song Xiao, Haoran Xia, Zhanyuan Li, Yifan Wang, Ju Tang, Xiaoxing Zhang, Yi Li

引用次数: 0

Distribution network planning considering active response of EVs and DTR of cables and transformers 考虑电动汽车主动响应和电缆、变压器DTR的配电网规划

IF 4.4 2区工程技术

High Voltage Pub Date : 2025-04-30 DOI: 10.1049/hve2.70024

Chen Pan, Weijiang Chen, Chengke Zhou, Wenjun Zhou

{"title":"Distribution network planning considering active response of EVs and DTR of cables and transformers","authors":"Chen Pan, Weijiang Chen, Chengke Zhou, Wenjun Zhou","doi":"10.1049/hve2.70024","DOIUrl":"https://doi.org/10.1049/hve2.70024","url":null,"abstract":"With increasing electricity demand and large-scale stochastic charging of electric vehicles (EVs), distribution networks face inevitable shortage of transfer capability, bringing new challenges to distribution network planning (DNP). Dynamic thermal rating (DTR), which evaluates the equipment rating based on actual meteorological conditions and equipment thermal state, can enhance the equipment transfer capability to meet the increasing load demand. In this paper, we propose a model considering the active response of EVs, and a bi-level DNP model incorporating the DTR of cables and transformers, in the upper level, the Prim algorithm is embedded into the particle swarm optimisation (PSO) algorithm to obtain an initial grid topology; in the lower level, types of cables and transformers as well as the installation of DTR equipment are determined, second-order cone (SOC) relaxation and linearisation of the variables product are then carried out to meet the non-linear constraints of cables and transformers, and the upper and lower models are solved in an iterative manner. Case studies demonstrate that the implementation of DTR effectively enhances the transfer capability of cables and transformers, saving 4.8% investment cost while ensuring 96% uplift of power supply. Besides, with 90% active response rate of EVs, total cost can be further reduced.","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"10 2","pages":"279-293"},"PeriodicalIF":4.4,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.70024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892856","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}

引用次数: 0