2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)最新文献_第9页

DC Electrical Trees in XLPE Induced by Short Circuits 短路诱导XLPE中的直流电气树

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705362

S. Kumara, T. Hammarström, Xiangdong Xu, A. M. Pourrahimi, Christian Müller, Y. Serdyuk

引用次数: 1

Measurement and Analysis of partial discharges patterns in high voltage resin impregnated capacitors 高压树脂浸渍电容器局部放电模式的测量与分析

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705353

O. G. Gnonhoue, A. Velazquez-Salazar, I. Preda, É. David

引用次数: 2

A Non-destructive Condition Assessment Method for DBC Substrate: Dielectric Measurement DBC衬底无损状态评估方法:介电测量

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705454

Zhuolin Cheng, Yiwei Long, Kangning Wu, Chuang Zhang, Hang Fu, Shihang Wang, Jianying Li, Shenghe Wang

{"title":"A Non-destructive Condition Assessment Method for DBC Substrate: Dielectric Measurement","authors":"Zhuolin Cheng, Yiwei Long, Kangning Wu, Chuang Zhang, Hang Fu, Shihang Wang, Jianying Li, Shenghe Wang","doi":"10.1109/CEIDP50766.2021.9705454","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705454","url":null,"abstract":"Direct bonding copper (DBC) substrate is employed in high power density modules, improving its reliability is of critical significance for the safety of power electronic system. In this paper, thermal cycling ageing from -55°C to 150°C was conducted on alumina DBC substrate. Both the variation of interface structures and dielectric properties were obtained in the failure process. Based on the experimental results, the substrate damaged at ~70 cycles due to the thermal expansion coefficient (CTE) mismatch between copper and ceramic. After 45 cycles, copper/ceramic interface turned rougher. Equivalent capacitance (Ceq) was found to be almost unchanged at ~115.8 pF. While tanδ increased from 6.2×10−4 to 1.3×10−3 since the initiation of micro cracks. Afterwards, dramatic drop of Ceq and tanδ was noticed, with Ceq decreased from 115.8 pF to 83.0 pF and tanδ declined to 4.5×10−4. Besides, cliff shaped structure was found around the crack point. It is convinced that, propagation of micro cracks broadened the air gap between copper and ceramic, finally diminished the Ceq. Obviously, the turning point of Ceq is an important indicator in thermal cycling fatigue. Dielectric measurement might be an effective non-destructive technique for condition assessment of DBC substrate.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"2016 1","pages":"522-525"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73405542","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

PD Pattern Analysis Relevant to PWM-like Voltage Waveforms 与类pwm电压波形相关的PD模式分析

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705345

L. Briano, A. Bruzzone, F. Gallesi, F. Guastavino, E. Torello

引用次数: 1

Electrical conduction and polarization of silica-based capacitors under electro-thermal poling 电热极化下硅基电容器的导电性和极化特性

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705450

C. Nieves, R. Wilke, S. Bishop, M. Lanagan, P. Clem

{"title":"Electrical conduction and polarization of silica-based capacitors under electro-thermal poling","authors":"C. Nieves, R. Wilke, S. Bishop, M. Lanagan, P. Clem","doi":"10.1109/CEIDP50766.2021.9705450","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705450","url":null,"abstract":"Electrical conduction in silica-based capacitors under a combined effect of intermediate electric field and temperature (2.5 – 10 kV/mm, 50-300°C) is dominated by localized motion of high mobility ions such as sodium. Thermally stimulated polarization and depolarization current (TSPC/TSDC) characterization was carried out on poled fused silica and AF32 glass samples. Two relaxation mechanisms were found during the depolarization step and an anomalous response for the second TSDC peak was observed. Absorption current measurements were performed on the glass samples and a time-dependent response was observed when subjected to different electro-thermal conditions. It was found that at low temperature (T = 175 °C) and short times, the current follows a linear behavior (I α V) while at high temperature (T = 250 °C), the current follows V0.5. TSPC/TSDC and absorption current measurements results led to the conclusion that (1) Poole-Frenkel dominates conduction at high temperatures and at longer times and that (2) ionic blockage and/or H+/H3O+ injection are responsible for the observed anomalous current response.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"11 1","pages":"171-174"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82396129","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 Breakdown Strength of Hydrocarbon Thermosetting Resin in Low Temperature Environment 低温环境下烃类热固性树脂的击穿强度特性

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705372

Takaaki Matsuki, Y. Inoue, K. Hamasuna, M. Kozako, M. Hikita, Naoki Fukumoto, N. Kamei

{"title":"Characteristics of Breakdown Strength of Hydrocarbon Thermosetting Resin in Low Temperature Environment","authors":"Takaaki Matsuki, Y. Inoue, K. Hamasuna, M. Kozako, M. Hikita, Naoki Fukumoto, N. Kamei","doi":"10.1109/CEIDP50766.2021.9705372","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705372","url":null,"abstract":"Dicyclopentadiene (DCP) resin is a hydrocarbon-based thermosetting resin (HTR) with better crack resistance than epoxy (EP) resin, as an organic insulating material used in low-temperature regions such as liquid helium (LHe) and liquid nitrogen (LN2). This paper presents dielectric breakdown strength, Eb, of DCP under AC and standard lightning impulse (Imp) voltage application at room temperature and LN2 temperature while comparing with results of EP resin. It was found that Eb of DCP at LN2 temperature exceeded that at room temperature, indicating ∂Eb∂/T < 0, and larger than that of EP. Experimental results showed that Eb of EP and DCP at room temperature decreased with increasing the sample thickness d, indicating ∂Eb∂/d < 0. Since EP exhibited ∂Eb∂/T < 0 and ∂Eb/∂d < 0, an attempt is made to discuss breakdown mechanism in terms of the electron avalanche breakdown theory as a dominant one in EP. As a result, the ionization coefficient H of EP was evaluated as 1670 kV/mm, the mean free path λ as 195 nm, and the mobility μ as 65.4×10-4 m2/Vs. On the other hand, since DCP shows a negative temperature dependence (∂Eb/∂T < 0) in the low temperature region, the breakdown mechanism is discussed with the electronic thermal breakdown mechanism proposed by Frohlich based on the balance between the energy gain due to the interaction between electrons in the excited impurity level (ΔV) and electrons in the conduction band, and the energy loss to the lattice system. As a result, ΔV was evaluated to be 5.7 meV in DCP.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"24 1","pages":"578-581"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91044528","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

Partial discharges in electrical trees grown at 0.1 (VLF) and 50 Hz analyzed using PRPD and NLTSA 使用PRPD和NLTSA分析0.1 (VLF)和50 Hz生长的电树的部分放电

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705339

Pablo Donoso, R. Schurch, J. Ardila-Rey

{"title":"Partial discharges in electrical trees grown at 0.1 (VLF) and 50 Hz analyzed using PRPD and NLTSA","authors":"Pablo Donoso, R. Schurch, J. Ardila-Rey","doi":"10.1109/CEIDP50766.2021.9705339","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705339","url":null,"abstract":"Electrical treeing is one of the main degradation mechanisms in high voltage polymeric insulation that could lead to electrical equipment failure. Electrical trees grow under partial discharge (PD) activity; therefore, PD measurement is a fundamental tool for electrical insulation diagnosis. In this paper, PDs are analyzed for electrical trees grown in epoxy resin needle-plane samples at very low frequency (VLF) 0.1 Hz and 50 Hz excitation voltages. PD analysis was carried out through the traditional PRPD analysis and with nonlinear time series analysis (NLTSA) tools, which is more recent in this context. For PRPD analysis at VLF, the discharge power and the 95th percentile of PD amplitude showed a nearly linear increase with the tree length. However, at 50 Hz, these parameters showed an oscillatory behavior which could be a consequence of a more conductive structure. For NLTSA, we calculated the correlation dimension and Lyapunov exponent. This last parameter showed positive values for VLF and 50 Hz tests, indicating a deterministic chaotic behavior for both cases.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"2 1","pages":"200-203"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86300417","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

Electrical Tree Initiation and Growth in LDPE Under Negative DC Fields 负直流电场下LDPE材料电树的形成与生长

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705315

F. Liu, S. Rowland, V. Peesapati, H. Zheng

引用次数: 2

Influence of Concentration of Nanoparticles on the Dielectric Frequency Response of an Insulating Nanofluid 纳米颗粒浓度对绝缘纳米流体介电频率响应的影响

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705334

S. Rohith, Niharika Baruah, S. K. Nayak

{"title":"Influence of Concentration of Nanoparticles on the Dielectric Frequency Response of an Insulating Nanofluid","authors":"S. Rohith, Niharika Baruah, S. K. Nayak","doi":"10.1109/CEIDP50766.2021.9705334","DOIUrl":"https://doi.org/10.1109/CEIDP50766.2021.9705334","url":null,"abstract":"Liquid insulation is employed in transformers along with the solid insulation for the reliable operation. The transformer insulation has technologically advanced over time and a number of varieties are explored. Every insulation is found to have some or the other advantages and disadvantages. The application of a particular liquid insulation is chosen based on its properties. Among the insulating oils being studied for transformer application, nanofluids are delivering promising electrical and thermal characteristics compared to the base oils. The dielectric frequency response is one of the non-destructive and offline technique to analyze a few dielectric properties of the insulating oil and it is used to estimate the moisture content of pressboard and the conductivity of the insulating oils, unlike the power frequency test which can only be used for estimating the contaminants. The frequency response is observed over a wide range of frequencies. The low frequency response is very much crucial in characterizing the dipole moment as it is significant at lower frequencies. In this paper, the concentration of the insulating nanoparticle in base oil is varied and the frequency response, polarization, and conductivity are studied at room temperature. The response is a depiction of the condition of the liquid insulation. The conductivity, relative permittivity and the dissipation factor are plotted. All these parameters are in the frequency range from 1 mHz to 10 kHz, which is the suitable range to study the liquid insulation.","PeriodicalId":6837,"journal":{"name":"2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"34 1","pages":"418-421"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82734549","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

Non-intrusive technique for measuring space charges in dc cables 直流电缆中空间电荷的非侵入式测量技术

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI: 10.1109/CEIDP50766.2021.9705386

M. Jebli, T. Martiré, J. Laurentie, P. Notingher, L. Boyer, J. Castellon

引用次数: 0