2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)最新文献

{"title":"A novel furfural-detection-method for the aging prediction of paper insulation in power transformer","authors":"Lei Peng, Qiang Fu, Musong Lin, Yaohong Zhao, Yihua Qian, Shengli Li","doi":"10.1109/CEIDP.2018.8651071","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8651071","url":null,"abstract":"Paper insulation is an important kind of solid dielectric in power transformers which influences the safety and stable operation of the transformers. Furfural, as an important indicator in transformer oil, can evaluate the degradation degree of paper insulation and predict the remaining life of transformers. However, it is always inconvenient to detect furfural because of the extraction procedure. In this work, a novel no-extraction furfural-detection-method based on UV-Vis spectrometry was proposed to evaluate the aging of paper insulation by the degree of polymerization (DP). The results show that this furfuraldetection- method has a favorable linear relationship between the concentrations of furfural (Ck) and its characteristic absorbance. The coefficient of deviation is less than 6.9% (n=7) for the furfural detection, indicating the satisfactory accuracy of results. The correlation between DP of papers and Ck are simulated with the goodness of fit (R2=0.964). Then, the aging of paper insulation could be predicted by the calculation of DP.","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":"125802156","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}

{"title":"Variation of Current-Density as a Function of Electric-Field Intensity in Synthetic Nanoclay-filled Polypropylene","authors":"H. Hiziroglu, I. Shkolnik","doi":"10.1109/CEIDP.2018.8544831","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544831","url":null,"abstract":"Within the scope of this study variation of current-density with electric-field intensity is studied in polypropylene filled with 0% (plain polypropylene), 2%, 4% and 8% synthetic nano-clay by weight. While recording the rms voltage and current, the power-frequency voltage (60Hz) was raised across each specimen at a speed of 226 V/s. In order to see the reproducibility of the results, 5 samples, with the same nano-clay concentration, were subjected tests under the same conditions. Each specimen under test revealed that the current-density varied non-linearly with the electric-field intensity. Moreover, some degree of saturation was observed at relatively higher electric fields in all the specimens. The saturation of the synthetic-clay loaded nanocomposite started at higher electric fields than the plain polypropylene. Up to a critical electric field intensity the capacitance of the materials was found to be almost constant, but for the electric fields higher than the critical electric field, the material behaves non-linearly leading to a dramatic reduction in capacitance.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"50 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":"131634616","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}

{"title":"Research on Familial Defect Recognition Method of Transformer Based on Correlation Analysis","authors":"Jinzhong Li, Jianyi Wang, Shuangjing Zhu, B. Qi, Meng Huang, Peng Zhang, C. Gao, Chengrong Li","doi":"10.1109/CEIDP.2018.8544775","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544775","url":null,"abstract":"As the key equipment of power system, the reliability of the transformer directly affects the safe operation of the power system. Due to the existence of familial defects in design, materials, and manufacturing processes, the probability of familial defects is relatively high, resulting in a significantly higher fault rate after commissioning. At present, the research on the recognition method of transformer's familial defects is mainly based on a single parameter or a small number of parameters. There is no comprehensive systematic method to automatically analyze and identify familial defects. Therefore, this paper proposes a familial defect recognition method based on correlation analysis. The method of identifying the transformer's familial defects based on correlation analysis mainly includes the following four parts. Firstly, collecting data such as ledger information, defect record information, manufacturer information, and years of operation of transformers and so on. Then, using statistical analysis, correlation analysis to comprehensively analyze the data. Further, from the analysis results, the features closely related to familial defects are discovered, and the association relationship between state quantity and familial defects is established. Finally, using statistical analysis, multi-dimensional analysis, hierarchical analysis, correlation analysis to study the recognition method of the familial defect for transformer and establish analysis model. By analyzing the association relationship between feature quantities and the familial defects of the transformer, this paper proposes a method to identify the familial defects of the transformer. At the same time, the analysis model of transformer familial defect is also established. It can be concluded from this paper that the method of recognizing the familial defects based on correlation analysis is effective and accurate. Applying it to field data, the familial defects can be recognized efficiently and accurately.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"20 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":"128260620","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}

{"title":"Determination of the Effects of Accelerated Ageing on the Dielectric Properties of LLDPE and LLDPE/HNT Composites","authors":"P. Kadlec, R. Polanský, P. Prosr","doi":"10.1109/CEIDP.2018.8544903","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544903","url":null,"abstract":"Composites based on a linear low-density polyethylene (LLDPE) and containing clay filler halloysite nanotubes (HNT) are perspective due to advantageous fire retardancy. This paper is focused on an impact assessment of an accelerated aging on dielectric properties of these composites (LLDPE/HNT), more specifically, accelerated aging by intensive ultraviolet (UV) radiation is taken into account. Evaluation of this type of aging is important in every practical situation when electrically insulating layers are exposed to sunlight. Composites were prepared with three different weight percentage of clay filler and pure LLDPE is used as the reference material. Samples were exposed to UV radiation for 50 h, 100 h, and 150 h. Emphasis is placed primarily on the characterization of changes in dielectric strength in a harmonic electric field and volume resistivity of tested materials. Furthermore, tested materials were also analyzed by broadband dielectric spectroscopy to describe an influence of the exposure to UV radiation on the frequency and temperature dependent relative permittivity. Detection of a minimal deterioration and, in some cases, even a slight improvement of selected dielectric parameters of LLDPE/HNT caused by UV radiation, is very positive. Results obtained by broadband dielectric spectroscopy prove changes of polarization processes in tested composites which occurred as an effect of UV irradiation.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"110 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":"120891869","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}

{"title":"Influence of DC Component on Partial Discharge Activity","authors":"F. Guastavino, A. Bruzzone, C. Gianoglio, E. Torello","doi":"10.1109/CEIDP.2018.8544901","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544901","url":null,"abstract":"The purpose of this work is to analyze how the presence of combined AC-DC voltages can influence the partial discharge (PD) activity. A DC offset can be introduced by power electronics components affecting the partial discharge inception voltage (PDIV). If the PD phenomenon is the main cause of the electrical insulation degradation, the lifetime can be influenced by the presence of a DC component in the voltage waveform. In this work a simplified configuration has been considered in order to analyze the influence of the DC offset on the PD behavior. Twisted Pair samples have been taken into account representing surface PD activity conditions. The enameled wires have been subjected to PD activity after a conditioning in oven at 150 °C. The effect introduced by the DC continuous component offset is considerable. The number of discharges increases and the level of inception voltage decreases proportionally with the decrease of the continuous component, consequently the lifetime values vary since they are influenced by the PD activity. It has been possible to observe how the DC component influences the PD activity and the relevant degradation processes. This preliminary work suggests to perform exhaustive studies to better understand how the presence of a AC-DC voltage waveform can influence the PD behavior in case in different types of defects.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"47 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":"128907445","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}

{"title":"Measurement of Carrier Mobility in Polyethylene based on the Pulsed Electro-acoustic Method","authors":"Rui Su, Kai Wu, Chuanhui Cheng, Yang Wu, Wei Zheng, K. Qian, Liangliang An","doi":"10.1109/CEIDP.2018.8544839","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544839","url":null,"abstract":"As the uncertainty of transportation parameters in space charge simulation, it is our attempt to extract the fundamental parameters from experiments. In this paper, with the design of unipolar charge injection and migration experiment on the basis of space charge measurement by PEA method, the carrier mobilities of positive and negative charge in LDPE have been estimated. The value of calculated mobility of negative charges is in agreement with other estimation methods. Moreover, it is found that the carrier mobility of positive charge is larger than negative charge in LDPE, which might be owning to the less amount of amorphous-crystalline interfaces in the process of hole transportation.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"18 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":"134210135","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}

{"title":"Influence of Dicumy1 Peroxide Content on DC Performance of Polyethylene for DC Cables","authors":"Lianghong Cao, L. Zhong, Yinge Li, Haiyang Ren, Jinghui Gao, Guanghui Chen, Wenpeng Li, Weikang Li, Chong Zhang","doi":"10.1109/CEIDP.2018.8544884","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544884","url":null,"abstract":"Peroxide crosslinked polyethylene (XLPE) has become the primary insulation material for extruded high voltage direct current (HVDC) power cables. Crosslinking process can influence the performance of XLPE cable insulation, especially the content of dicumyl peroxide (DCP) plays an important role on the DC properties of XLPE. This paper discusses DC performance of XLPE with a series of DCP contents, leading to different crosslinking degrees. The corresponding gel content and crystallization of XLPE with different crosslinking degrees were systematically investigated, and DC properties were characterized by space charge measurement, conductivity test and breakdown test. The results show that with the increase of gel content (0~90%), crystallinity of XLPE does not show much change with a reduction less than 5%, and the accumulated space charge changes from homocharges (negative) to heterocharges. Conductivity (~10–14S/m) of XLPE with different crosslinking degrees does not show significant differences. Moreover, DC breakdown strength of XLPE tends to increase with the increase of crosslinking degrees in the temperature range of 50°C~90°C. It thus suggests that the designing of crosslinking network of XLPE has great impact on the DC performance of cable insulation, and is vital in HVDC cable development.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"47 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":"132029311","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}

{"title":"Genesis, Identification and Bayes Estimation of the Inverse Power Model for Insulation Reliability Assessment","authors":"E. Chiodo, L. D. di Noia, F. Mottola, G. Mazzanti","doi":"10.1109/CEIDP.2018.8544863","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544863","url":null,"abstract":"Physical/mathematical laws describing electrical insulation aging play a key role for the reliability model identification of the insulation itself. This holds for the popular Inverse Power Model, too. The paper first discusses the deduction of the Inverse Power Model from reasonable physical and mathematical models of ageing, described via proper characterization of the random variables or the stochastic processes involved. Then, some analytical aids are given in order to perform its identification and Bayes Estimation, also by means of numerical applications with reference to in-service electrical failure data.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"180 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":"132224268","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}

{"title":"Combined Effect of Temperature and Humidity of Magnet-Wires on Partial Discharge Inception Voltage under Inverter-Surge Voltage","authors":"T. Kaji, H. Asai, H. Kojima, N. Hayakawa","doi":"10.1109/CEIDP.2018.8544745","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544745","url":null,"abstract":"We investigated the combined effect of temperature and humidity on partial discharge inception voltage (PDIV) of magnet wires under repetitive surge-wave voltages. As the results, the PDIV increased as the temperature increased under uncontrolled humidity, which is peculiar under surge-wave voltage. On the other hand, the PDIV decreased lineally as the temperature increased under controlled humidity. From these results, we found that the PDIV increase under uncontrolled humidity was attributed to the effect of the relative humidity decrease corresponding to the temperature increase. Furthermore, the PDIV was also influenced by the moisture amount in insulation film. Under uncontrolled humidity, the PDIV during the temperature increase was lower than that during the temperature decrease with the hysteresis. We found two reasons for the PDIV hysteresis. One reason is the humidity increase in the air gap due to moisture evaporation from the film. Another reason is the electron emission from the film with the lower first ionization energy. Based on the above reasons, the generation probability of initial electrons during the temperature increase is higher than that during the temperature decrease, which decreases PDIV.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"15 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":"130057924","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}

{"title":"Electro-Mechanical and Chemical Strength Analysis of Thermally Aged Nanofluid Impregnated Kraft Paper","authors":"Mrutyunjay Maharana, Niharika Baruah, S. K. Nayak, N. Sahoo","doi":"10.1109/CEIDP.2018.8544795","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544795","url":null,"abstract":"The transformer is a long run device in a power system network. When transformer oil comes in contact with cellulosic insulation in the presence of heat, the solid insulation undergoes polymerization. As a result, dielectric, mechanical and chemical properties of the oil and kraft paper get affected. In this present study, electrical, mechanical and chemical degradation of the thermally aged nanofluid (NF), and mineral oil (MO) impregnated kraft papers are analysed. To understand the degradation of the aforementioned properties of the kraft paper, thermal ageing study has been performed. A comparative study of the aged kraft paper is carried out to study the electrical breakdown, tensile strength and the degree of polymerization. The thermal ageing experiment is performed for two different insulating oils, namely: MO and exfoliated hexagonal boron nitride (Eh-BN)/MO-NF impregnated kraft paper. 0.01wt.% of nanofiller concentration is chosen for the preparation of Eh-BN/MO-NF. Highly insulating, thermally conducting and superior physicochemical properties of the NF are suitably chosen for the thermal ageing. An ageing study of both MO and NF impregnated kraft paper is performed in two different ageing vessels at 160°C for different aging durations such as 100, 500, 1000 and 2000 hours respectively. It is observed from the experimental results that both modulus and tensile strength of Eh-BN/MO-NF aged kraft papers are superior than that of MO aged kraft papers. Electrical strength of the NF impregnated aged kraft paper has minimum decrement in the AC breakdown voltage. Early polymerization in MO impregnated kraft paper is the reason for drastic degradation of its mechanical strength. Eh-BN/MO-NF reduces the effect of early polymerization and minimum affinity towards polar contamination during thermal ageing and hence provides better electro-mechanical stability to the insulating NF impregnated kraft paper.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"7 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":"132179743","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}