2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)最新文献_第3页

Comparison of Mineral Oil Behavior with and Without the Presence of Catalysts During Accelerated Thermal Aging 矿物油在催化剂作用下和无催化剂作用下加速热老化行为的比较

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544778

P. Hahn, R. Polanský

{"title":"Comparison of Mineral Oil Behavior with and Without the Presence of Catalysts During Accelerated Thermal Aging","authors":"P. Hahn, R. Polanský","doi":"10.1109/CEIDP.2018.8544778","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544778","url":null,"abstract":"This article deals with an impact of the presence of catalysts on the properties of mineral oil during accelerated thermal aging. The mineral oil was thermally aged both in the catalytic and in the non-catalytic environments. The catalysts used were copper and electrical insulation paper (Kraft paper) which belongs to common parts of power transformers. The experiment was aimed to verify whether and how the catalysts influence the degradation rate. The oil was exposed to an elevated temperature (130 °C) during the process of accelerated thermal aging for 120 hours. During this time, selected parameters were continuously monitored and measured by the several diagnostic methods which include dielectric strength test, Fourier Transform Infrared Spectroscopy (FT-IR) and Differential Scanning Calorimetry (DSC). FT-IR and DSC were utilized to provide new observables and endpoint criteria to assess the remaining useful life of mineral transformer oil. Obtained results so far confirm that mineral oil aged with the presence of catalysts appeared to have a faster aging trend and some observables evaluated from FT-IR and DSC have promising trend desired for calculation of the remaining useful life of mineral transformer oil.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128716926","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

Feasibility of Partial Discharge Localization in Power Transformers based on a novel Curve Fitting Method 一种新的曲线拟合方法在电力变压器局部放电定位中的可行性

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544788

M. Rahimbakhsh, M. Mostoofi, P. Werle, E. Gockenbach

{"title":"Feasibility of Partial Discharge Localization in Power Transformers based on a novel Curve Fitting Method","authors":"M. Rahimbakhsh, M. Mostoofi, P. Werle, E. Gockenbach","doi":"10.1109/CEIDP.2018.8544788","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544788","url":null,"abstract":"This contribution focuses on feasibility of partial discharge (PD) localization for power transformers based on a novel curve fitting coefficient method. The measured partial discharge waveforms by high frequency current transformer (HFCT) are processed using the sinusoidal curve fitting (CF) method with a high rated fitting quality. The extracted coefficients of the selected function terms are then evaluated in order to find the location of the PD. The proposed method is implemented on the high voltage winding of a lab-transformer to verify its applicability and accuracy. The experiment is comprised of injecting PD pulses into different points along the winding and applying the proposed localization algorithm. Afterwards, error ranges are provided to evaluate the accuracy of the method. The proposed method is based on analyzing the PD waveforms, which could be obtained from two sides of the high voltage winding of power transformers using high frequency current transformers. The curve fitting coefficient method and complementary measured results are presented and discussed comprehensively in this paper. In this study, a novel curve fitting coefficient method is proposed in order to localize PD in power transformers. Furthermore, the feasibility of applying this method is discussed in details, which show that this method could be used for PD localization in power transformers.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130178789","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

Space Charge Behavior and Electrical Breakdown Strength of XLPE Film Sandwiched between Semiconducting Layers 夹在半导体层之间的XLPE薄膜的空间电荷行为和电击穿强度

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544774

K. Ogura, Hiroki Kasuga, H. Miyake, Y. Tanaka

{"title":"Space Charge Behavior and Electrical Breakdown Strength of XLPE Film Sandwiched between Semiconducting Layers","authors":"K. Ogura, Hiroki Kasuga, H. Miyake, Y. Tanaka","doi":"10.1109/CEIDP.2018.8544774","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544774","url":null,"abstract":"In the ordinary space charge distribution measurement using pulsed electro-acoustic (PEA) system, a semi-conductive (SC) layer is inserted between a high voltage metal electrode and a measurement sample to improve a mismatch of acoustic impedance between them. On the other hand, as a grounded electrode, an aluminum (AI) plate is usually used to increase a sensitivity of the measurement. However, in an actual XLPE (cross-linked polyethylene) cables, an inner and an outer SC layers are used as the electrodes, and XLPE insulating layer is sandwiched by them. Therefore, to understand the actual space charge effects in the actual cable on a breakdown property, it is important to study the space charge accumulation characteristics in XLPE using such electrode system. In this paper, we measured the space charge distribution and external circuit current density in XLPE sandwiched by the SC layers under dc high electric stress. As a result, a larger current was observed in the XLPE sandwiched by the SC layer, but the fracture strength appeared to be similar to that in the XLPE of a conventional electrode system. From this result, it is thought that even if XLPE is sandwiched between SC layers, it would not show any effect on the dielectric strength.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128894995","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

Organometallic-Organic Hybrid System as Flexible Dielectric Material 有机金属-有机杂化体系作为柔性介电材料

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544816

S. Nasreen, M. Tefferi, M. Baczkowski, G. Sotzing, Yang Cao

引用次数: 0

A Novel Wavelet Selection Scheme for Partial Discharge Signal Detection under Low SNR Condition 低信噪比条件下局部放电信号检测的小波选择新方法

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544802

Jiajia Liu, W. H. Siew, J. Soraghan, E. Morris

{"title":"A Novel Wavelet Selection Scheme for Partial Discharge Signal Detection under Low SNR Condition","authors":"Jiajia Liu, W. H. Siew, J. Soraghan, E. Morris","doi":"10.1109/CEIDP.2018.8544802","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544802","url":null,"abstract":"Over the past two decades, wavelet-based techniques have been widely used to extract partial discharge (PD) signals from noisy signals. To effectively select the correct technique to minimize the effect of noise on PD detection, three aspects are considered: wavelet selection, decomposition scale, and noise or threshold estimation. For wavelet selection, popular techniques, including correlation-based wavelet selection scheme (CBWSS) and energy-based wavelet selection scheme (EBWSS), are applied to select an appropriate wavelet basis function. These two schemes, however, have their limitations. CBWSS is not as effective as expected when the signal to noise ratio (SNR) is very low. EBWSS selects the optimal wavelet that can maximize the energy ratio of the PD signal in approximation coefficients through wavelet decomposition. It is not strictly true for damped oscillating PD signals, particularly when the decomposition scale increases. As such, a novel wavelet selection scheme, wavelet entropy-based wavelet selection scheme (WEBWSS), is proposed to provide an alternative to CBWSS and EBWSS for PD denoising. PD signals are simulated and also obtained through laboratory experiments to demonstrate that this new method has better performance in the removal of noise, particularly when SNR is low.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131240126","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: 9

Electron and Ion Swarm Parameters in Gas Mixtures of Ar, He with Dry Air by Pulsed Leaser-Induced Plasma Method 用脉冲激光诱导等离子体法研究氩、氦与干燥空气混合气体中的电子和离子群参数

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544915

R. Sasamoto, R. Nomiyama, N. Tanaka, Y. Izawa, K. Nishijima

{"title":"Electron and Ion Swarm Parameters in Gas Mixtures of Ar, He with Dry Air by Pulsed Leaser-Induced Plasma Method","authors":"R. Sasamoto, R. Nomiyama, N. Tanaka, Y. Izawa, K. Nishijima","doi":"10.1109/CEIDP.2018.8544915","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544915","url":null,"abstract":"We measured electron and ion swarm parameters in gas mixtures of Ar or He with Dry Air at atmospheric pressure. This paper presents the average drift velocity of three kinds of charged particles and the effective ionization coefficient of electrons using two types of gas mixtures: Ar with Dry Air (Ar/Dry Air) and He with Dry Air (He/Dry Air). The Pulsed Laser-induced Plasma method was used in this experiment because this way can measure discharge current easily. Each gas were injected into discharge chamber to total gaseous pressure 760 Torr (1013 hPa) converted by 20 °C. As a result, the average drift velocity of electrons in Ar/Dry Air depended on mixing rate of Ar and changed remarkably at low reduced electrical field: E/P = about 5 – 18 V/cm Torr. On the other hand, it showed almost same value in a range of E/P = about 23 – 33 V/cm Torr. In case of the average drift velocity of ions, the drift velocity in He/Dry Air was faster than that in Ar/Dry Air at same E/P. Moreover, the drift velocity of positive and negative ions in Ar/Dry Air almost had no effect on injected Ar gas amount. Regarding the effective ionization coefficient of electrons, Ar/Dry Air and He/Dry Air depended on Air concentration. Especially, the critical reduced field strength Ec/P depended on Air concentration, remarkably.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121289751","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

Pattern Analysis of Discharge Characteristics for Condition Evaluation of Polymer Insulators in Fog-Haze Environment 雾霾环境下聚合物绝缘子状态评估放电特性模式分析

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544782

Kai Zhou, Yong Liu, Kuan Ye, Chunsheng Li, Qian Wang, Yingmiao Cai, Liang Yang, Ruizhe Zhang

{"title":"Pattern Analysis of Discharge Characteristics for Condition Evaluation of Polymer Insulators in Fog-Haze Environment","authors":"Kai Zhou, Yong Liu, Kuan Ye, Chunsheng Li, Qian Wang, Yingmiao Cai, Liang Yang, Ruizhe Zhang","doi":"10.1109/CEIDP.2018.8544782","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544782","url":null,"abstract":"With the frequent appearance of fog-haze weather in China, outdoor insulators are exposed to the new contamination problem, which is characterized as the long-term heavy humidity and severe fine polluted particles, which can enhance the probability of the surface discharges, even flashover. An artificial fog-haze system was established to simulate typical fog-haze conditions of outdoor insulators in the operation. The salt fog and fine particles were simultaneously injected into the artificial climate chamber. The fog was generated by an ultrasonic vibration salt fog generator filled with saline water solution. The fine particles were prepared by both conductive and nonconductive particles at different components. When the experimental condition was sustained for different duration, the transition of surface discharges until the flashover was recorded by using an analog to digital (A/D) converter, with the sampling frequency of 10kHz. Then, pattern identification of discharge currents was carried out based on non-linear analysis method to reflect the process and underlying mechanism of surface flashover in fog-haze environments. The obtained results show that with the duration of fog-haze conditions, the flashover voltage show the rapid decreasing tendency, especially with the increase in the conductive components of fine-particles and fog conductivity. The nonlinear analysis of discharge currents can reveal the prominent increase of peak value with the experimental duration, and with the increase in the conductive components of fine-particles and fog conductivity, which is well in accordance with the transition of surface discharges to the flashover. The investigation is beneficial to reflect the discharge characteristics and flashover mechanism of outdoor insulators in fog-haze environments, which is helpful to enhance the operating reliability of outdoor insulator in power system.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124928999","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

Tree Propagation and Partial Discharge Phenomena of Nanocomposite Epoxy 纳米复合环氧树脂的树形繁殖及局部放电现象

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544829

T. Nakamura, T. Yoshimitsu, T. Yokoi, A. Kumada, K. Hidaka, H. Hirai, T. Imai

{"title":"Tree Propagation and Partial Discharge Phenomena of Nanocomposite Epoxy","authors":"T. Nakamura, T. Yoshimitsu, T. Yokoi, A. Kumada, K. Hidaka, H. Hirai, T. Imai","doi":"10.1109/CEIDP.2018.8544829","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544829","url":null,"abstract":"Tree propagation and partial discharge phenomena in nano-filled epoxy under the application of 50-Hz sinusoidal wave are studied. Silica particles whose diameters are 12 nm are filled in epoxy samples by 5 wt% and 10 wt%. Trees in a pure sample and a 5-wt% sample propagate and approach close to the grounded electrode. On the other hand, a tree in a 10-wt% sample stopped without approaching close to the ground. Luminescence of a partial discharge is also investigated. In a pure sample and a 5-wt% sample, luminescence of partial discharges is observed at the only tree tip. On the other hand, luminescence of a partial discharge in a 10-wt%sample is observed from the needle tip to the tree tip. The result suggests that conductivity of trees in nanocomposite epoxy becomes lower than that in pure epoxy. The difference of conductivity is an important factor to suppress propagation of electrical trees. SEM observation of tree walls shows that nano particles are attached to the tree walls in a nanocomposite sample. With these results, we propose the suppression model of tree propagation in a nanocomposite sample. In a nanocomposite sample, nano particles on tree walls prevent trees from carbonization, in other words, becoming conductive. Therefore, energy of a partial discharge hardly concentrates only at the tree tip in a nanocomposite sample because partial discharges in trees occur from the needle tip to the tree tip.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125173796","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: 10

Influence of Aluminum Foil and External Conductor on the Temperature Distribution of RIP Condenser Converter Transformer Bushings 铝箔和外导体对RIP冷凝器换流变压器衬套温度分布的影响

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544743

Xi Yang, Qingyu Wang, Zongren Peng

引用次数: 5

Partial Discharge Erosion on Gamma-Ray Irradiated Epoxy/Al2O3 Nanocomposites γ射线辐照环氧/Al2O3纳米复合材料局部放电侵蚀性能研究

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544769

Y. Gao, X.F. Wang, J.L. Wang, B.B. Xu, T. Han, Y. Liu, B. Du

{"title":"Partial Discharge Erosion on Gamma-Ray Irradiated Epoxy/Al2O3 Nanocomposites","authors":"Y. Gao, X.F. Wang, J.L. Wang, B.B. Xu, T. Han, Y. Liu, B. Du","doi":"10.1109/CEIDP.2018.8544769","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544769","url":null,"abstract":"In this paper, epoxy based nanocomposites with Al2O3as filler have been prepared to study the influence of gamma-irradiation on its partial discharge erosion behavior. The filler content was selected at 1 wt%, 3 wt% and 5 wt%, respectively. A Cobalt-60 gamma source was employed for the irradiation treatment with the doses up to 1000 kGy. Partial discharge erosion was attained by a pair of rod-plane electrode. Simultaneously, a 3D surface profiler was used to detect the erosion morphology. In order to have a more comprehensive understanding of the radiation effect on the epoxy sample, isothermal surface potential decay and differential scanning calorimetry have been measured to obtain the Tg and trap distribution features. Test results indicated that the maximum erosion depth appeared to decrease firstly and tended to increase afterward with the sample exposed from 0 kGy to 1000 kGy. The addition of nano-Al2O3 had a positive effect on modifying the resistance to partial discharge of epoxy resin irrespective of the irradiation dose, and 3 wt% of nano-Al-O, addition contributed to the smallest erosion depth among all the nanocomposites. It is suggested that the partial discharge erosion on the nanocomposites is varied since the chemical reaction induced by radiation depends on the radiation dose. Deeper trap leads to better resistance to the discharge erosion.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134557172","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