2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)最新文献_第10页

Rigid amorphous fraction caused by isothermal crystallization in ATH filled silicone rubber ATH填充硅橡胶中等温结晶引起的刚性非晶态分数

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437490

Yingfei Lin, Yuhao Liu, Kangning Wu, Liming Wang

{"title":"Rigid amorphous fraction caused by isothermal crystallization in ATH filled silicone rubber","authors":"Yingfei Lin, Yuhao Liu, Kangning Wu, Liming Wang","doi":"10.1109/CEIDP49254.2020.9437490","DOIUrl":"https://doi.org/10.1109/CEIDP49254.2020.9437490","url":null,"abstract":"Alumina trihydrate (ATH) filled silicone rubber is widely used as materials of outdoor insulators in transmission lines. The lowest temperature of regions covered by transmission lines in some extreme cold areas can be below the melt crystallization temperature of ATH filled silicone rubber. In this paper, broadband dielectric spectroscopy (BDS) was used to observe internal structures of ATH filled silicone rubber during and after crystallization. Relaxations related to molecular segments constrained by lamella crystal and motions of mobile amorphous fraction were confirmed. With the decrease of the temperature, the content of rigid amorphous fraction and mobile amorphous fraction decreased. The fragility index of mobile amorphous fraction was higher than rigid amorphous fraction, indicating that the cooperative rearrangement ability in mobile amorphous fraction was greater. With the increase of isothermal crystallization time, ε’ at 50 Hz increased and then became stable due to growth of crystallization, while ε” at 50 Hz decreased due to increased difficulty for the ions to accumulate on the ATH surface. It was also found that the glass transition temperature was about -105 □ at 50 Hz. This paper can provide guidelines for outdoor insulators used in extreme cold conditions.","PeriodicalId":170813,"journal":{"name":"2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129185650","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

Effect of solid nitrogen particles on partial discharge characteristics in slush nitrogen 固体氮颗粒对污泥氮局部放电特性的影响

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437558

K. Yamada, T. Kawashima, Y. Murakami, N. Hozumi

引用次数: 0

Dissolved Gas Analysis (DGA) of Thermally Aged Blended Transformer Oil 热老化混合变压器油的溶解气体分析

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437452

Manas Chakraborty, Niharika Baruah, Rohith Sangineni, Sisir Kumar Nayak, Prabhat Kumar Maiti

{"title":"Dissolved Gas Analysis (DGA) of Thermally Aged Blended Transformer Oil","authors":"Manas Chakraborty, Niharika Baruah, Rohith Sangineni, Sisir Kumar Nayak, Prabhat Kumar Maiti","doi":"10.1109/CEIDP49254.2020.9437452","DOIUrl":"https://doi.org/10.1109/CEIDP49254.2020.9437452","url":null,"abstract":"Vegetable based ester oils (VOs) are potential substitute of mineral insulating oils (MOs) in transformers due to their enhanced dielectric properties and better biodegradability. Retro filling of operating transformers originally filled with MO by VO is a real possibility, resulting to a mixture of VO and MO, known as the blended oils (BOs). The nature of gas formation (dissolved gases) in blended insulating oils (i.e. MO/VO mixture) needs investigation to understand the fault conditions in such transformers. Fresh MO and VO samples are blended in different proportions, namely, BO1 (25% VO + 75% MO), BO2 (50% VO + 50% MO) and BO3 (75% VO + 25% MO) and are thermally aged in open beaker for 168 hours at 150°C. Dissolved Gas Analysis (DGA) is carried out as per IEC 60567 before and after ageing along with the individual MO and VO. The different DGA fault diagnosis techniques are compared. The DGA data shows that the gas generation varies with the change in MO/VO proportion. Though, most of the gases show decreasing trend in concentration with increase in VO proportion, generation of gases like C2H6, CO and CO2 is more in the blended oils (BO) than compared to the individual oils (MO & VO). The nature of gas generation in thermally aged BOs is different than that of thermally aged individual MO and VO. The molecular interaction between VO and MO molecules may be responsible for higher gas generation in BOs. The mechanism of gas formation in BOs needs more investigation.","PeriodicalId":170813,"journal":{"name":"2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130545607","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: 2

Recognition of Nanocomposites Agglomeration in Scanning Electron Microscopy Image with Semantic Segmentation Algorithm 基于语义分割算法的扫描电镜图像中纳米复合材料结块识别

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437466

Yu Bai, D. Qiang, Yanru Zhang, Xinyu Wang, Xu Zhuang, George Chen, Yan Wang

引用次数: 0

Terahertz and Far-infrared Absorption Spectroscopic Study of DNA Bases DNA碱基的太赫兹和远红外吸收光谱研究

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437559

Tomofumi Seki, Y. Ohki, M. Mizuno

引用次数: 1

Energy Level Gradient Under Electric Field Revealed by Molecular Dynamics Simulation of Polyethylene and Antioxidant 聚乙烯和抗氧化剂分子动力学模拟揭示的电场下能级梯度

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437379

H. Uehara, T. Okamoto, S. Iwata, Y. Sekii, T. Takada, Y. Cao

引用次数: 1

Influence of nanoparticle interface on enhancing dielectric constant by low loading nanofillers 纳米颗粒界面对低负荷纳米填料提高介电常数的影响

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437464

Xin Chen, Tian Zhang, Qiyan Zhang, Q.M. Zhang

引用次数: 0

Propagation observation of creepage discharge using multi-array coaxial probe 用多列同轴探头观察蠕滑放电的传播

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437540

T. Kawashima, S. Hanamoto, Y. Murakami, N. Hozumi

引用次数: 0

Dielectric characterization of palm kernel oil ester-based insulating nanofluid 棕榈仁油酯基绝缘纳米流体的介电特性

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437477

S. Oparanti, A. Khaleed, A. Abdelmalik, N. Chalashkanov

{"title":"Dielectric characterization of palm kernel oil ester-based insulating nanofluid","authors":"S. Oparanti, A. Khaleed, A. Abdelmalik, N. Chalashkanov","doi":"10.1109/CEIDP49254.2020.9437477","DOIUrl":"https://doi.org/10.1109/CEIDP49254.2020.9437477","url":null,"abstract":"This work presents a study on the dielectric and breakdown characteristics of nanofluids prepared from the palm kernel oil ester to examine the influence of nanoparticles on the dielectric loss and its compatibility with Kraft paper. The relative permittivity, dielectric loss, and high voltage DC conductivity of the nanofluid samples were studied with varying weight percentages of Al2O3 nanoparticles ranging from 0.2 wt% to 1 wt% to understand the behavior of the material and explore its adequacy as an electrically insulating fluid in oil-filled HV electric equipment. The dielectric loss was observed to decrease by an order of magnitude with 1 wt% Al2O3 nanoparticles. Measurement of DC electrical breakdown voltage of the ester-based nanofluids revealed that the dispersion of nanoparticles in the fluid result in an increase in the breakdown voltage of the base fluid with the optimum value obtained at 0.6 wt%. The presence of nanoparticles in the ester-based insulating fluid did not seem to have any adverse effect on the breakdown strength of the Kraft papers. The study indicated a decrease in the dielectric loss of the nanofluid when compared with the base alkyl ester and with improved breakdown voltage. The dielectric behavior of Kraft paper impregnated with the nanofluid samples displayed comparable insulation properties.","PeriodicalId":170813,"journal":{"name":"2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129352083","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: 14

Correlation between Voltage Endurance and Dielectric Loss Tangent/Partial Discharge for Stator Coils of HV Motors 高压电机定子线圈介电损耗与正切/局部放电的关系

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI: 10.1109/CEIDP49254.2020.9437526

Haiyang Ren, Songlin Jiang, Qinxue Yu, Jiaxi He, L. Zhong

{"title":"Correlation between Voltage Endurance and Dielectric Loss Tangent/Partial Discharge for Stator Coils of HV Motors","authors":"Haiyang Ren, Songlin Jiang, Qinxue Yu, Jiaxi He, L. Zhong","doi":"10.1109/CEIDP49254.2020.9437526","DOIUrl":"https://doi.org/10.1109/CEIDP49254.2020.9437526","url":null,"abstract":"Vacuum pressure impregnation (VPI) technique is now widely used in the insulation systems of high voltage (HV) motors and generators due to good electrical, mechanical and thermal performances. The voltage endurance, dielectric loss tangent and partial discharge are the most common and effective means to assess the electrical properties of full-size stator coils. In this paper, the relationship between voltage endurance and tanδ as well as the partial discharge is investigated for stator coils with the rated voltage (Un) of 10kV. The voltage endurance test is carried out at 3Un50Hz. The tanδ measurement is performed over the voltage range of 0.2 Un- 1.2 Un with intervals of 0.2Un. Partial discharge is measured to obtain the inception voltage, extinction voltage and QIECvalues in the operating voltage (Un/√3) and the rated voltage (Un). It has been found that the coil group with longer voltage endurance tends to show lower tanδ and tip-up, higher inception and extinction voltages and smaller apparent partial charges. It manifests that the destructive voltage endurance test and non-destructive diagnostic measurements of tanδ and partial discharge have good consistency in assessing the insulation properties for HV coils. Moreover, calculations of correlation coefficients between voltage endurance and tanδ or partial discharge parameters show that the tanδ and partial discharge magnitude at the operating voltage can be more effective for evaluating the quality and estimating the lifetime of insulation system for HV coils, compared with such parameters measured at the rated voltage.","PeriodicalId":170813,"journal":{"name":"2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"707 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132948048","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