2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)最新文献_第7页

Surface Charge Accumulation on a Real Size Epoxy Spacer in Various Gas Atmospheres under DC Voltage 直流电压下不同气体环境下真实尺寸环氧隔离器表面电荷积累

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509198

Wenqu Wang, Zhonglei Li, Yu Gao, Huicun Zhao, Huan Wang, X. Yuan

{"title":"Surface Charge Accumulation on a Real Size Epoxy Spacer in Various Gas Atmospheres under DC Voltage","authors":"Wenqu Wang, Zhonglei Li, Yu Gao, Huicun Zhao, Huan Wang, X. Yuan","doi":"10.1109/ICEMPE51623.2021.9509198","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509198","url":null,"abstract":"Surface charge accumulation on the epoxy spacer installed in gas insulated transmission line (GIL) and gas insulated switchgear (GIS) has been recognized as a crucial factor for electric field distortion that results in reduction of surface flashover voltage. This paper reports on the surface charge accumulation on a real size epoxy spacer in various gas atmospheres. A coaxial electrode system was designed to investigate the surface charge density on the spacer under DC voltage of −10 and −30 kV. The spacer and electrode were placed in a metal enclosed test chamber which was filled with 0.1 MPa air, 0.4 MPa SF6/N2 mixture or in vacuum so as to estimate the influence of gas atmosphere on the charge accumulation behavior. The results indicated that positive charges were accumulated on the nonplanar region in air, whereas negative charges were mainly accumulated on the nonplanar region in SF6/N2 mixture and vacuum. It is considered that the charge accumulation behavior is determined by the competition result among the bulk, the gas and the surface conductions.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"90 2 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83452563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the Decrease of Power Loss during DC Degradation of Zinc Oxide Varistor Ceramics 氧化锌压敏电阻陶瓷直流降解过程中降低功率损耗的研究

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509247

Zongke Hou, Yingying Zheng, M. Guo, Yao Wang, Zhuolin Cheng, Kangning Wu, Jianying Li, Shengtao Li

{"title":"Study on the Decrease of Power Loss during DC Degradation of Zinc Oxide Varistor Ceramics","authors":"Zongke Hou, Yingying Zheng, M. Guo, Yao Wang, Zhuolin Cheng, Kangning Wu, Jianying Li, Shengtao Li","doi":"10.1109/ICEMPE51623.2021.9509247","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509247","url":null,"abstract":"Zinc oxide (ZnO) varistor ceramics present excellent nonlinear current-voltage characteristics so that they are widely used as core materials in overvoltage protection. Generally, the nonlinear characteristics of traditional ZnO varistor ceramics would deteriorate under constant DC bias voltage, manifested as the continuous increase of power loss. However, it has been reported that some commercial samples experience a decrease in power loss during DC degradation, which makes them more stable in operation. The physical mechanism behind this unusual phenomenon is still unclear yet. In this paper, commercial ZnO varistor ceramics with this unique characteristic were employed for DC degradation and accelerated recovery. Current-voltage curves were measured in the ageing and recovery process. The results show that the forward barrier height declines and the nonlinearity becomes better, in contrast, the reverse nonlinearity falls off. But after enough recovery, the electrical properties of the ageing samples almost restored to the initial levels. To sum up, the opposite changes occurred between the forward and reverse characteristics in the ZnO varistors ceramics, but both are invertible.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"25 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84766507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical Analysis of the Motion Characteristics of Combustion Particles in Gap based on Multi-Physical Field Coupling 基于多物理场耦合的间隙燃烧颗粒运动特性数值分析

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509140

Changjie Zhou, D. Xiao, Yang Bao

{"title":"Numerical Analysis of the Motion Characteristics of Combustion Particles in Gap based on Multi-Physical Field Coupling","authors":"Changjie Zhou, D. Xiao, Yang Bao","doi":"10.1109/ICEMPE51623.2021.9509140","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509140","url":null,"abstract":"In case of wildfire, particles generated in combustion are in complex law of motion under the influence of flame temperature, airflow and lots of electrons and ions. They would distort the space electric field, and lead to gap discharge. This paper develops a multi-physics coupling calculation model of fluid, temperature, electric field and particle movement by combining the rod-plate gap experiment that simulates the wildfire condition. It analyzes the motion state of ash particles in flames, studies the charged particles of different polarity separately, and explores the impact of particle properties on the electric field of gap space by combining the distribution of particles. Results have shown that there are differences in the motion state of charged particles of different polarity, and the electrode will absorb some particles with different charges, while charged particles with the same polarity as the electrode will move away from the electrode in random motion. Particles of different properties (particle size, relative dielectric constant) have different impacts on the electric field of gap space, but they all promote the discharge propagation.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"11 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84202966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Influence of Thermal Aging on Space Charge Distribution in Oil-impregnated Paper under AC Field 交流电场下热老化对油浸纸空间电荷分布的影响

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509094

Guiyue Zhou, Y. Yin, Jiandong Wu, Lu Che

{"title":"The Influence of Thermal Aging on Space Charge Distribution in Oil-impregnated Paper under AC Field","authors":"Guiyue Zhou, Y. Yin, Jiandong Wu, Lu Che","doi":"10.1109/ICEMPE51623.2021.9509094","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509094","url":null,"abstract":"The winding insulation in transformer usually bears the combined action of DC and AC components during the operation. The positive and negative charges are injected from the electrodes respectively, while under the AC field, the injection of positive and negative charges alternately occurs on the single electrode due to the periodic change of the electric field polarity, and the direction of carrier migration changes with the applied field. Thus, the charge behavior under AC field is more complicated. In this paper, the space charge distribution in oil-impregnated paper with different aging times was measured under different frequency sinusoidal electric fields. According to the phase characteristics of charge distribution, the effect of thermal aging on the charge behavior under AC field was analyzed from the perspective of charge source. It shows that there is charge hysteresis in the insulation, that is, the residual charges injected in the previous cycle form a heterocharge accumulation after the voltage is reversed, resulting in serious field distortion. According to the preliminary analysis of the results from early aging period, the more severe the aging, the less obvious the charge hysteresis is, which may be related to the decrease of the trap depth caused by thermal degradation. It is speculated that the charge hysteresis under AC field is an important cause of accelerating the electrical aging of the insulation.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"20 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82356023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fault Analysis and Electric Field Simulation of Elbow Cable Terminal in Distribution Network 配电网肘形电缆终端故障分析及电场仿真

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509150

Deng Zhixiang, Pan Jianbing, Yan Nianping, Hao Yu, Qi Qinya, Chen Gege, Chen Zhen, Huang Yangqi

引用次数: 0

Gearbox Fault Diagnosis for Wind Turbines based on Data Augmentation using Improved Generative Adversarial Networks 基于改进生成对抗网络数据增强的风力发电机齿轮箱故障诊断

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509056

Chen Shen, Jingang Wang, Junsheng Chen, Bin Zhang

引用次数: 1

Analysis of Infrared Characteristics of SO2F2 and SOF2 of SF6 Decomposition Components SF6分解组分中SO2F2和SOF2红外特性分析

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509100

Chao Bian, F. Dai, Jun Cheng, Qiang Gan, Zhengdong Zhang, Guanglu Cui, Tingyue Tan, Dongfeng Li, Jiangang Xie

引用次数: 2

Study on Epoxy Resin Curing Process Based on Frequency Dielectric Spectroscopy 基于频率介电光谱的环氧树脂固化工艺研究

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509230

Yinjun Shi, Yushun Zhao, Wei Yang, Xin Chen, Yun Chen

{"title":"Study on Epoxy Resin Curing Process Based on Frequency Dielectric Spectroscopy","authors":"Yinjun Shi, Yushun Zhao, Wei Yang, Xin Chen, Yun Chen","doi":"10.1109/ICEMPE51623.2021.9509230","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509230","url":null,"abstract":"Evaluation of epoxy cure is an important work because the final mechanical and electrical characteristics will depend upon how the curing process was done. Dielectric analysis (DEA) is one method to monitor the curing of the epoxy. Some studies on this method can already be found in literature. However, these studies do not provide a detailed analysis of the dielectric properties of the epoxy entire curing process. As a new field evaluation method for insulation condition, the frequency domain dielectric spectroscopy (FDS) has been paid more and more attention. The purpose of this paper is to analyze the dielectric properties of epoxy curing process by frequency domain dielectric spectroscopy. An experimental platform was set up to measure the epoxy curing by using dielectric response analyzer. Epoxy samples with different curing degree were prepared by changing curing time (curing degree measured by DSC). The experimental results show that at the same frequency, as the degree of curing increases, the dielectric loss factor and dielectric constant first increase, then decrease, and finally remain unchanged. The frequency domain dielectric spectroscopy has the potential to detect the degree of epoxy.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"47 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89137416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An Improved Method to Evaluate the Severity of Discharges with DGA Based on Thermodynamics 一种改进的基于热力学的DGA放电严重程度评估方法

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509005

Rui Guo, Jian Wang, Ren Liu, A. Ping, Ruofan Xiao, Jingrui Wang

引用次数: 0

Structure Design of UHVDC Pure SF6 Insulated Bushing 特高压直流纯SF6绝缘套管结构设计

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI: 10.1109/ICEMPE51623.2021.9509168

Gengsheng Xie, Yunfei Shi, Shi-lun Shi, Qingyu Wang, Peng Liu, Zongren Peng

引用次数: 0