2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)最新文献

{"title":"Measuring Thermal Diffusivity of Thin Films in Thickness Direction","authors":"Shijie Chen, F. Zheng, Chenyu Huang, Yewen Zhang","doi":"10.1109/ICPADM49635.2021.9493955","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493955","url":null,"abstract":"Thin polymer films are widely used in electric and electronic industries, due to their outstanding electrical insulation properties. The accurate thermal parameters of thin film are beneficial to describe the thermal characteristics of electronic devices, which may improve their stability and service life. Therefore, it is important to measure the thermal parameters of thin films in high accuracy. We propose a novel method based on thermal response current to achieve the measurement of the thermal diffusivity of thin film with thickness several micrometers. In this paper, a two-layer sample structure is utilized, where one of the layers acts as the detector with known thermal parameters and the other as measured film. We record the thermal displacement current of the detector film and analyze the time-domain characteristics of the thermal displacement current. The temperature distribution in the two-layer structure and the displacement current by the thermal pulse exciting detector layer were simulated by numerical calculation, the optimal solution of the thermal diffusivity of the thin film is achieved through multiple iterations. This method can quickly measure the thermal diffusivity of thin film in thickness direction with high accuracy, especially suitable for polymer films with a thickness of a few microns.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131035226","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":"Prediction of a Transformer’s Loading and Ambient Temperature based on SARIMA Approach for Hot-Spot Temperature and Loss-Of-Life Analyses","authors":"Naji Saleh, N. Azis, J. Jasni, Mohd Zainal Abidin Ab Kadir, Mohd Aizam Talib","doi":"10.1109/ICPADM49635.2021.9493865","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493865","url":null,"abstract":"Hot-Spot Temperature (HST) is among the important parameters that can be used to evaluate the Loss-Of-Life (LOL) of transformers. HST can be determined through thermal modeling of which loading is one of the important parameter that needs to be obtained. This paper presents the prediction transformer’s loading of a 132/33 kV, 60 MVA Oil Natural Air Natural (ONAN) transformer and ambient temperature based on Seasonal Autoregressive Integrated Moving Average (SARIMA). First, the computed loading profile was validated with the measured data. Next, the loading profile was forecasted for 1 year to evaluate the HST and LOL of the transformer. Differential model in IEC60076-7 was used to determine the HST based on the forecasted data. Based on Mean Absolute Percentage Error (MAPE), Mean Absolute Error (MAE) and Root Mean Square Error (RMSE), the best fit of SARIMA model are used to represent the transformer loading. This leads to the prediction of transformer HST that fluctuates along the 365 days and the LOL increases linearly with multiple fluctuations. It is also found that the prediction estimates the maximum HST is 66.93°C and the corresponding LOL based on predicted 1 yearly data is 666 minutes.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132928446","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":"Polarization and Depolarization Current Analysis for Field Degraded Cross Linked Polyethylene Cables","authors":"S. Sulaiman, A. M. Ariffin, T. M. Kuan, M. Osman, N. H. Nik Ali, H. Illias","doi":"10.1109/ICPADM49635.2021.9493953","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493953","url":null,"abstract":"Gradual deterioration in polymeric cable insulation system, whether due to continuous applications of high voltages or ageing mechanisms, may lead to eventual cable failure and subsequent electricity disruption. This has led to the growth in need for power utility companies to explore methods to closely monitor and assess the health of cable insulation, through condition-based monitoring (CBM) exercises. Polarization and depolarization current (PDC) analysis is a non-destructive insulation monitoring method that has been widely applied to assess the health of insulation for high voltage equipment especially power transformers. This study proposes to expand on the recent interest in PDC’s assessment of cross-linked polyethylene (XLPE) cable insulation degradation. It attempts to investigate the PDC behaviour by performing experimental and simulation studies on in-service field degraded XLPE cables. Comparisons between PDC measurements and simulations for 39 field cables saw matching patterns in terms of categorization by conductivity values. Based on works done by established researchers, a five level PDC based CBM categorization for cable maintenance was proposed, ranging from healthy to moderately degraded to severely degraded cable insulation conditions. Comparison between the proposed and existing PDC based CBM table of a power utility company saw a 76.92% match, suggesting that the technique can be used to ascertain cable insulation degradation.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132325857","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":"High Dielectric and Energy Storage Polymer Dielectrics","authors":"Shengtao Li, Yang Feng","doi":"10.1109/ICPADM49635.2021.9493998","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493998","url":null,"abstract":"The continuous miniaturization of electronic devices and electric equipment requires high energy-storable dielectric capacitors. Therefore, seeking dielectric materials with high power density and high energy density becomes more urgent for ensuring their reliability. However, the contradiction between the increase in the dielectric constant and breakdown strength severely limits the sustainable increase in the energy density of polymer dielectrics. Here, recent advances in high dielectric and energy storage polymer dielectrics will be introduced. Polymer structure is an important factor in determining dielectric properties and energy storage characteristics of polymers, while the relationship between them is still unclear, which hinders the design of high energy-storable polymers. Our emphasis will be given to how to tailor the polymer structures for high dielectric and energy-storable polymer dielectrics. The effect of the polymer structures on the polarization and charge transport characteristics are also carefully discussed for further understanding the structure-property relationship. Finally, the follow-up research is briefly introduced. We intend that this work will help academics and industry toward high energy-storable polymer capacitors.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133234237","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":"A Comprehensive Survey on Alternating Fluids Used For The Enhancement of Power Transformers","authors":"Gopakumar S, Sree Renga Raja.T","doi":"10.1109/ICPADM49635.2021.9493912","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493912","url":null,"abstract":"In recent days, the insulating fluids plays an essential role in the design of power transformers, because the performance of the power system is highly depends on the transformers used in the system. Conventionally, the mineral oils are used in the transformers for increasing the cooling effect, but is less biodegradable and has a reduced fire resistant characteristics. So, it is important to identify an alternating insulating oil for enhancing the power transformers. Due to this reason, this research work intends to survey the characteristics of various alternating oils used for the power transformers. In this analysis, the oils and its characteristics have been surveyed with the specific usage. It includes the vegetable oil, ester oil, magnetic oil, silicone gel, and nano fluids. Based on this, the characteristics of the transformer oil can be enhanced by mixing the nano particles with the vegetable oil. Then, the conditional assessment of these oils are validated by using the measures of breakdown voltage, viscosity, dielectric constant, flash point, fire point, and acidity.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127381332","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":"Air Bubble in Liquid Food under Pulsed Electric Field Pasteurization using Coaxial Chamber","authors":"Rai Naveed Arshad, Z. Abdul-Malek, Abdullah Munir, Mohd Hafizi Ahmad, M. Sidik, Z. Nawawi","doi":"10.1109/ICPADM49635.2021.9493962","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493962","url":null,"abstract":"Dielectric breakdown of air bubbles embedded in liquid food is a limiting factor in the pulsed electric field (PEF) pasteurization. Therefore, a proper chamber's geometry, air degasification, and estimation of electric field enhancements (due to gas bubbles) are powerful strategies to overcome this limitation. In this study, a coaxial treatment geometry loaded by an orange liquid sample encompassing a gas bubble demonstrated importance in the electric field distributions. The development of a gas bubble induces the non-uniform electric field near the bubble surface. A numerical analysis through COMSOL Multiphysics was done to observe the effects of a bubble diameter and the liquid's flow inside the coaxial chamber geometry. An air bubble with a comparable diameter has influenced more to the electric potential difference, and the position of the air bubble also affects the value of perturbation in the electric potential. This study supports the development of an electroporator for PEF pasteurization of liquid food.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131700155","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":"Effect of Large Mechanical Stress on Electrical Tree Characteristics of Silicone Rubber","authors":"Wei Jiaxing, Miao Siping, Xu Man","doi":"10.1109/ICPADM49635.2021.9493916","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493916","url":null,"abstract":"Silicone rubber (SIR) is widely used in the field of high-voltage cable accessories insulation due to its excellent electrical properties. However, according to statistics, in 2016 alone, there were many cable accidents at home and abroad, among which cable accessories failure accounted for 85.5%. In order to fit closely with the cable, the high-voltage cable accessories adopt the installation method of pre-expanding and maintain the expanding state in the long-term operation of the cable. The silicone rubber is deteriorated by the circumferential mechanical stress, which is easy to lead to electrical tree and finally cause breakdown fault. At present, because the steel needle electrode is easy to form gas gap with the insulating material which results in the error of electrical tree experiment under the large deformation, the research on mechanical stress is mainly focused under 30% deformation, which is far less than the actual diameter expansion ratio of 45%. In this paper, in order to approach the actual working state of the insulation material of accessories, the initial voltage and morphological characteristics of silicone rubber electrical tree under large tensile ratio of 0%, 25%, 45% and 60% were studied. In order to avoid the stress concentration at the tip of the traditional steel needle electrode, a new semi conducting needle electrode was designed and successfully manufactured, and a real-time observation system of electrical tree under power frequency was built. The results showed that the initial voltage of semi conducting needle electrode was higher than that of traditional needle electrode under the same tree initiation condition. With the increase of tensile mechanical stress, the initial voltage decreased from 15.30kV to 14.33kV, and the electrical tree tended to grow in the direction of stress application. Combined with the test results of Differential scanning calorimetry and Thermogravimetric Analysis, it can be seen that the \"melting point\" and the temperature of maximum thermogravimetric rate increased first and then decreased with the increase of tensile ratio. At low tensile ratio, small-scale fracture of SIR molecular chain occurred, and the amorphous region increased. At high tensile ratio, the number of broken molecular chains increased. On the whole, the physical crosslinking of silicone rubber was destroyed, some molecular segments cracked, the free volume inside the material became larger, the electrical tree was more easily induced, and the electrical tree resistance of the material decreased.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131732081","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":"Dissolved Gas Analysis of Thermally Aged Mineral Oil and Vegetable Oil Based Nanofluids","authors":"Prabhat Kumar Maiti, Manas Chakraborty","doi":"10.1109/ICPADM49635.2021.9493964","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493964","url":null,"abstract":"Mineral oil (MO) is widely used as insulating liquid in transformers. However, environmental impact, reducing availability of petroleum resources and issues with disposal of used oil; vegetable ester oil (VO) is being considered as potential replacement of MO. However, with the adoption of ultra-high voltage AC and DC power transmission systems; there is a need for liquid insulator with superior electrical and thermal properties. In recent times, evolution of nanotechnology has prompted research work on MO and VO based Nano fluids (NFs) suitable as liquid insulators. Though the NFs are superior in electrical and thermal properties compared to their base fluids, further studies are needed to establish their stability to thermal and electrical stresses and applicability of existing fault diagnostic tools. In this study MO, VO, MO/VO mixture (1:1) and their NFs of 0.01% Al2O3 and 0.01% SiO2 were subjected to accelerated thermal ageing at 150°C for 168 hours in presence of Kraft paper and copper wire in sealed glass bottles with Argon blanket. Dissolved Gas Analysis (DGA) was conducted as per IEC 60567 on all the samples after ageing. The DGA result showed variation in gas concentrations in MO, VO and MO/VO mixture. Presence of nanoparticle was observed to affect the quantity of gas generated. The concentration of gases generated in MO and its NFs were relatively less compared to VO and its NFs. Gas analysis was carried out using conventional ratio techniques, Duval Triangle and Duval Pentagon for establishing suitability of diagnostic techniques applicable to various oils.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123680937","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":"Simulation Analysis and Improvement Design of Electric Field Distribution for Shielding Device in UHV Converter Station Indoor DC Yard","authors":"Zichen Zhao, Zehua Wu, Zongren Peng, Yongjie Li, Wei Zhang, Guohua Yang","doi":"10.1109/ICPADM49635.2021.9493944","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493944","url":null,"abstract":"In recent years, ultrahigh-voltage direct current (UHVDC) project has become an important direction of power system development and application. In UHVDC converter station, corona discharge may occur if the maximum electric field of metal electrode surface reaches corona electric field. The reasonable design of shielding device for different equipment in the converter station can not only effectively ensure the safety and stability operation of the system but also reduce the operation and maintenance cost. The shape and structure of different equipment are having large difference for ±800kV UHVDC project indoor DC yard, and the zero potential wall and roof are presented and increase the surface electrical field. The filter capacitor of DC yard has a large number of components which needs high requirement for internal insulation coordination. In this paper, a 3-D finite element simulation model of filter capacitor in UHVDC project indoor DC yard was established by using COMSOL. The potential and electric field distribution of filter capacitor shielding devices were calculated and analyzed. Based on the permitted value requirement, the electrode shape was continuously optimized. The research results of this paper could provide references for development and optimization design of filter capacitor in UHVDC project.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121552551","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":"Investigation of Transformer Oil Properties with advanced Multidimensional Methods","authors":"S. Schreiter, Holger Lohmeyer, P. Werle","doi":"10.1109/ICPADM49635.2021.9493982","DOIUrl":"https://doi.org/10.1109/ICPADM49635.2021.9493982","url":null,"abstract":"Power Transformers are basic elements in electric power systems. In case of an unplanned outage due to failure at the transformer not only to the costs reflected to the repair costs but also the costs related to interrupted power supply or the stop of production will occur. Therefore, it is necessary to assess the condition of power transformers and to identify risks early. For this, different diagnostic techniques were developed. In this context oil test, such as the measurement of the oil properties and the DGA, are well established and easy to perform methods.With the help of the insulation oil properties, possible aging of the oil can be identified and the remaining capability withstand dielectric stresses can be investigated. Because some parameters indicate the same properties (such as ageing state) it could be possible that there are pairs or groups of parameters, which give redundant results. Therefore, in this contribution it is investigated if a correlation between different insulation oil properties can be found. Furthermore, it was investigated if relationships between insulation oil properties and DGA results can be found.Both investigations were based on a huge number of oil test results of real transformers of different voltage levels, applications, age, and manufacturers.","PeriodicalId":191189,"journal":{"name":"2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124186534","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}