2019 IEEE Electrical Insulation Conference (EIC)最新文献_第2页

Analysis of the Degradation Kinetics of Kapton Film in an Aerospace Environment 航空环境下卡普顿膜降解动力学分析

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046608

Hasti Haghighi, I. Cotton

引用次数: 1

Effect of Gas-phase Fluorination on Trap Level of Nano-Alumina / Epoxy Resin Nanocomposites 气相氟化对纳米氧化铝/环氧树脂纳米复合材料陷阱能级的影响

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046565

Feipeng Wang, Muhammad Zeeshan Khan, Li He, Zhengyong Huang, Moon-Jae Yang

{"title":"Effect of Gas-phase Fluorination on Trap Level of Nano-Alumina / Epoxy Resin Nanocomposites","authors":"Feipeng Wang, Muhammad Zeeshan Khan, Li He, Zhengyong Huang, Moon-Jae Yang","doi":"10.1109/EIC43217.2019.9046565","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046565","url":null,"abstract":"In this work, nano-alumina / epoxy resin nanocomposites with nano-alumina fraction of 1, 3 and 5 wt.% were prepared and subsequently fluorinated at 40°C in F2/N2 gas mixture (20/80 v/v) with pressure of 0.05 MPa. The nano-alumina was treated by the saline coupling agent of $gamma$-aminopropyltriethoxysilane (KH550) to restrict the aggregation. The chemical bonding was examined by Fourier transform infrared spectroscopy (FTIR) which has indicated the molecular-chain scission during the gas-phase fluorination. The trap density and trap level distribution in the nanocomposites before and after fluorination were investigated by thermally stimulated current (TSC). The results shown that fluorination introduces shallow traps on the surface which increases the surface conductivity. Hence depth of charge traps are considerably reduced after fluorination. The results shown that nanocomposites with 1 wt.% nano-alumina appeared with deeper traps and higher trap energy level comparing with the other samples. However with increased nano-alumina mass fraction, e.g. 3 and 5 wt.%, considerable over-lapping interaction zones appear, that results in the reduced trap energy level.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133085754","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 Implications on the PD Characteristics of Unipolar versus Bipolar PWM waveforms 单极与双极PWM波形的PD特性研究

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046597

T. Hammarström

{"title":"The Implications on the PD Characteristics of Unipolar versus Bipolar PWM waveforms","authors":"T. Hammarström","doi":"10.1109/EIC43217.2019.9046597","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046597","url":null,"abstract":"Speed drives fed by pulse width modulated (PWM) inverters allows a more efficient use of electric energy. The drawback is however that the stress imposed on motor winding insulation increases due to a higher frequency harmonic content compared to the classical 50 Hz sinusoidal voltages. High frequency contributions have been observed in high voltage DC (HVDC) applications as well. In particular, partial discharges (PDs) considered the major contributor to the reduction in the insulation life time. It has been shown that the usage of electrical filters decreases electrical stress imposed on the insulation. Another option is to use multi level inverters, which have been shown to reduce magnitude of the PDs. It however remains to explain how the size of these voltage steps as well as polarity influences the level of PDs. Here twisted pair test objects are exposed to PWM inverter waveform at various rise times. Both bipolar and unipolar waveforms as well as different step sizes and rise times of each voltage flank are employed to present a gradual change between bipolar PWM to a more constant DC voltage magnitude with superimposed voltage ripple. To compare the performances, measurements of both PD inception and extinction voltages were conducted for the different cases. Additionally, the total number of PDs, their average maximum amplitude per cycle and pulse repetitive PD pattern (PRPD) are presented. The decreased step size to resemble more HVDC waveform and the resulting change in PD characteristics is discussed. Important factors are the time until PDs are observed (time lag) together with observed polarity dependences.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131100568","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: 4

Research on arc non-thermal equilibrium characteristics using chromaticity information from a visible digital image 利用可见数字图像的色度信息研究电弧非热平衡特性

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046564

Yuwei Wang, Qizheng Ye, Ziqing Guo

引用次数: 0

UHF Measurement of Partial Discharge on Stator Bars Using Patch Antennas 贴片天线对定子棒局部放电的超高频测量

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046554

M. Partyka, G. Bridges, B. McDermid, T. Black, B. Kordi

引用次数: 1

Diagnostic Testing of Power Cable Insulation For Reliable Smart Grid Operation 面向智能电网可靠运行的电力电缆绝缘诊断试验

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046619

S. Morsalin, A. Sahoo, B. Phung

{"title":"Diagnostic Testing of Power Cable Insulation For Reliable Smart Grid Operation","authors":"S. Morsalin, A. Sahoo, B. Phung","doi":"10.1109/EIC43217.2019.9046619","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046619","url":null,"abstract":"Polymeric insulation, especially cross-linked polyethylene (XLPE) insulated power cables are widely used in practice to transport electrical energy. XLPE has excellent dielectric properties, but its degradation due to various factors while in service is unlikely to avoid. Moreover, electrical, mechanical or thermal stresses accelerate the ageing process and shorten the lifespan. In the era of smart grid, its safe and reliable operation is vital. Hence, condition monitoring of insulation through diagnostic testing has become critically important to the smart maintenance of electrical infrastructure. In this paper, the diagnostic behaviors of XLPE insulation are explained by using two popular diagnostic methods, partial discharge (PD) and dielectric response (DR) measurements. For PD diagnosis, a comparative study of surface discharge and their characteristics under conventional power frequency (50 Hz) and very low frequency (0.1 Hz) excitation are presented. Dielectric responses are investigated in the frequency domain by $mathrm{tan}delta$ measurement and in the time domain by pol/depolarization current measurement. It is shown that useful information for insulation diagnosis can be extracted from the measurement results.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114069480","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

Dielectric response analysis as tool to assess the mechanical deterioration of VPI insulation 介质响应分析作为评估VPI绝缘力学劣化的工具

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046522

C. Staubach, S. Meissner, A. Cimino

引用次数: 1

Study on the Ageing Characteristics of Persea Americana Oil as an Alternative Transformer Insulation oil 美洲油作为变压器绝缘替代油的老化特性研究

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046615

Benard M. Makaa, G. Irungu, D. Murage

{"title":"Study on the Ageing Characteristics of Persea Americana Oil as an Alternative Transformer Insulation oil","authors":"Benard M. Makaa, G. Irungu, D. Murage","doi":"10.1109/EIC43217.2019.9046615","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046615","url":null,"abstract":"Mineral insulation oils have been used as a liquid insulation in electrical equipment for several decades. However, mineral oil is non-biodegradable and non-renewable. It has been predicted that they may run out in the near future. There is thus an urgent need to find their alternatives. Natural, plant based insulating oils are the solution. They are non-toxic, and possess higher fire points and excellent biodegradability characteristics. Therefore, to improve fire safety of transformers and to decrease the harmful environmental impact, there is an increasing demand for these insulating liquids as transformer insulating oils. Persea americana ester (PAE), a plant based oil has high biodegradability and is renewable. PAE has shown through experiments, a likelihood of being an alternative to mineral insulation oil (MIO) because of its good physico-chemical and electrical properties, so far investigated. Since insulating oil for transformers is used over several years, it is imperative to study the ageing characteristics of proposed new insulation oils. Accelerated ageing using open beaker method with copper catalyst was carried out to predict the reliability of Persea americana oil when in operation. The ageing test was based on accelerated thermal ageing to induce the ageing mechanisms within a short period (96 and 164 hours). Results obtained for Specific Resistivity at 27°C and 90°C, Dielectric dissipation factor, Total acidity and sludge for PAE; suggest that PAE could be a potential transformer insulating liquid. For comparison, the corresponding properties of mineral insulation oil (MIO) in the same experimental conditions were also measured. The results obtained as per the IEC and ASTM specifications gives hope for new natural liquid insulation oil.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"248 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114551641","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

Characteristics of the Partial Discharge-induced Current along Epoxy resin film under Superimposed AC- DC Voltage 交直流叠加电压下环氧树脂膜局部放电感应电流的特性

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046591

Tianxin Zhuang, Xuze Gao, M. Ren, Siyun Wang, Junkai Huang

{"title":"Characteristics of the Partial Discharge-induced Current along Epoxy resin film under Superimposed AC- DC Voltage","authors":"Tianxin Zhuang, Xuze Gao, M. Ren, Siyun Wang, Junkai Huang","doi":"10.1109/EIC43217.2019.9046591","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046591","url":null,"abstract":"Insulation of power electronic devices and converter station equipment is often under superimposed AC-DC voltage. The understanding of PD characteristics under AC-DC combined excitation plays an important role in designing the insulation of power electronic device. Previous researches focused on the stochastic features and mechanism under AC or DC voltages, while little attention was paid to the PD-induced charge movements under superimposed AC-DC field. The charge movements include the transient behavior of PD and the slow movement, which can be characterized by the transient PD current and the excess current respectively. In this paper, a composite AC-DC voltage is applied to a pair of rod-plane electrodes sandwiching epoxy film. And a sensitive high-frequency Rogowski coil and a capacitor-resistor shunt impedance are used to simultaneously measure the transient PD current and the excess current during PD. The excess current can be measured by cancelling the capacitive current from the total current. In the measurement, first set the AC voltage at 1.5 times the AC PDIV, then gradually raise the DC voltage up. The results show that, as the DC bias increases, the phase distributions of PD events are expanded, but the average PD currents and excess currents are lower than that under the pure AC electric field. Moreover, only few PD events are observed when the DC voltage rises close to the peak of AC voltage, and the surface flashover starts once the DC voltage rises above the peak of AC voltage. It is proved that the additional DC voltage suppress the corona discharge excited by the AC voltage to a certain extent, but it may also result in surface flashover if the DC bias exceeds the AC amplitude.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115434016","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 Effects of Steep Voltage Slopes on Insulation Systems of Coil Windings caused by Next Generation Power Semiconductor Devices 陡坡电压对新一代功率半导体器件线圈绕组绝缘系统的影响

2019 IEEE Electrical Insulation Conference (EIC) Pub Date : 2019-06-01 DOI: 10.1109/EIC43217.2019.9046515

V. Grau, R. D. De Doncker

{"title":"The Effects of Steep Voltage Slopes on Insulation Systems of Coil Windings caused by Next Generation Power Semiconductor Devices","authors":"V. Grau, R. D. De Doncker","doi":"10.1109/EIC43217.2019.9046515","DOIUrl":"https://doi.org/10.1109/EIC43217.2019.9046515","url":null,"abstract":"Next generation silicon carbide (SiC) and gallium nitride (GaN) semiconductors offer much faster switching characteristics in power electronic devices. The faster switching speed allows higher switching frequencies in combination with lower losses, which leads to smaller components and thus, a higher power density. However, the high voltage slopes associated with fast switching cause exceeding stress on the insulation systems, especially of coil windings. This increased stress results in accelerated aging and thus, premature failure of the insulation system. This paper focuses on the design and execution of experiments to quantify the detrimental effects of fast switching on the insulation system of coil windings. To investigate these effects, a dv/dt- generator is developed to excite various specimens with steep voltage slopes. Commercial products are not suitable for this purpose as they are either not available on the market or do not fully exploit the potential of the next generation semiconductors. A SiC-based inverter with an H-bridge topology is selected. The dielectric strength of twisted pair enameled wires are tested using a standardized insulation tester and the proposed dv/dt-generator. While the specimen withstands the standardized insulation test, partial discharges occur during excitation with high dv/dt, which leads to a premature breakdown after short time, even though the dv/dt test voltage is less than a sixth of the standardized test. It is experimentally observed that the steepness of the voltage slope has a major impact on the insulation system.","PeriodicalId":340602,"journal":{"name":"2019 IEEE Electrical Insulation Conference (EIC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124739757","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