2019 International Conference on High Voltage Engineering and Technology (ICHVET)最新文献

{"title":"Classification of Arc Fault in Sphere-Gap and Rod-Gap Using Stockwell Transform and Machine Learning Based Approach","authors":"Himadri Lala, S. Karmakar","doi":"10.1109/ICHVET.2019.8724248","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724248","url":null,"abstract":"There are different types of arc may occur depending on the arcing conditions and involved surfaces. The severity of the arc is determined by the involved arcing surface and the arcing current flowing path. In this study, arc in Sphere-Gap and Rod-Gap surfaces is considered for the time-frequency domain analysis. The voltage characteristics for both the arc events are recorded in different voltage levels and gap length. A Stockwell Transform (ST) based approach is applied on the arc signals for the harmonic decomposition. Further, K-Nearest Neighbor (KNN) machine learning algorithm is applied on the ST coefficients for the classification of real-time arc signals of different arcing conditions. The results obtained using ST and KNN algorithm successfully classifies different arc faults due to rod-gap and sphere-gap by their harmonic signature.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131145440","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":"Significance of Tank Current Measurement During Short Circuit Testing of Power Transformer","authors":"G. Venkateswarlu, Yugal Agarwal, M. S. Takkher, Wadhwani M K, Santhosh J","doi":"10.1109/ichvet.2019.8724333","DOIUrl":"https://doi.org/10.1109/ichvet.2019.8724333","url":null,"abstract":"Transformers are very costly equipment, when failure of the transformer happens, it affects the power supply and cost of repair is too excessive. During system operation transformers faces electrical, mechanical and thermal stresses. One of the critical situation during the short-circuits is which produces high currents in the transformer windings and hence high radial and axial forces in the windings. Transformers are specified and designed to withstand the effects of limited duration short-circuits at their terminals. Generally, Transformers undergoes various quality assurance checks, in which one of the main quality assurance checks is demonstration of ability to withstand short circuit test. Short-circuit tests are destructive test if the clamping system is not capable of sustaining the forces, it will cause permanent winding deformation, damage of core may occur. This paper will explain the importance of ability to withstand short circuit test and possible causes of failure due to short circuit forces during short circuit testing. This paper also explains the significance of tank current measurement and its evaluation with case studies. The result shows that if there is any tank current during short circuit test, it is the indication of some abnormality inside the transformer.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"164 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134127127","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 New Approach to Study Partial Discharge Inception due to Particles in Transformer Oil Using Electric Field Analysis","authors":"Muhammed Faisal Rahman, P. Nirgude","doi":"10.1109/ICHVET.2019.8724179","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724179","url":null,"abstract":"The presence of particle in transformer oil can cause significant deterioration to breakdown voltage and partial discharge inception voltage of transformer insulation. Although many studies are carried to understand the effect of particle in oil primarily concentrated on breakdown and discharge inception activities, contribution towards understanding the electric field stress distribution due to particle in oil are very limited. Electric stress distribution in transformer oil due to particle presence in oil gap between winding and pressboard barrier is simulated and studied using Finite Element Method (FEM). An attempt is made to correlate partial discharge (PD) inception caused by the local electric field distribution in transformer oil with respect to variation in conductivity of the particle. Effect of variation in size and shape of the particle on the electric field distribution is also considered in this study. The result of this new approach will be useful to understand partial discharge inception caused by electric field stress enhancement in transformer oil due to particle presence in oil gap between winding and pressboard barrier.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116678720","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":"Comparative Analysis of Dielectric Characteristics of Differently Manufactured High Voltage Insulation System for Generator Stator Winding","authors":"K. K. Kumar, K. M. Reddy, P.G.S. Kumar","doi":"10.1109/ICHVET.2019.8724283","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724283","url":null,"abstract":"In the year 2018, two turbo generators (TG) of 150 MVA, 11KV rating at different power plants were tested for condition assessment by the authors. TG1 was at a base load power plant and completed 25 years of service. TG2 was at combined cycle power plant and served for 15 years. Based on the year of installation, it was established that high voltage insulation system of stator winding in TG1 was processed with resin rich (RR) thermo set technology and that in TG2 was processed with global vacuum pressure impregnation (GVPI), an advanced technology. In this paper, comparative finding on RR and GVPI technologies for insulation of stator winding in these two TGs was presented for familiarization. Condition assessment tests such as insulation resistance (IR), dielectric loss factor (tan δ), partial discharge (PD), natural frequency test (NFT) and slot wedge tightness (WTD) had been carried to detect the defects in insulation. Analysis of the test data was presented to interpret the dielectric behavior of these two variants. It was concluded that the dielectric parameters of insulation systems in both TGs were at satisfactory levels due to timely corrective actions on TG1 stator winding and due to GVPI processed insulation on TG2 stator winding.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122394887","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 Study on AC/DC Tracking and Erosion Resistance of Liquid Silicone Rubber","authors":"Ashitha Pn, K. K, M. Naskar","doi":"10.1109/ICHVET.2019.8724382","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724382","url":null,"abstract":"In this study the AC and DC tracking and erosion resistance of 58% by weight loading of Aluminum Trihydrate micro sized filler in liquid silicone rubber polymer is studied. Tracking and erosion resistance test is performed as per IEC 60587:2007. For DC tests a partially modified test circuit was employed. Constant tracking test voltage method was used for the tests. Preliminary measurements of hydrophobicity and surface resistance were taken prior to the start of Inclined Plane Tracking (IPT) tests. To ascertain the degree of changes, post measurements were also performed. To analyse the morphological changes in the specimen, EDAX studies were performed. + DC IPT tests showed increased mass loss due to erosion, - DC IPT tests showed increased loss of hydrophobicity. The study forms a comprehensive work analyzing the effects of DC field on the liquid silicone rubber specimens.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117041969","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":"Stability Predictions of Zinc Oxide Surge Arrester by Employing Finite Element Solutions","authors":"Mihir N. Velani, S. C. Vora","doi":"10.1109/ICHVET.2019.8724129","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724129","url":null,"abstract":"A well-designed metal oxide (ZnO, zinc oxide) surge arrester offers a desired nonlinear characteristic to ground the surges and overvoltages at the safest level. Although a revolutionary work has been carried out in material research, the apparatus still suffers from a few limitations e.g., nonidentical ZnO block characteristics and its nonuniform thermal and structural behaviour. It becomes imperative to test device prototype for their electrical, mechanical and thermal performances. The cost for actual testing is huge and varies with the rating of the surge arrester. The software-based technique offers near actual behaviour assessment / functional visualization of the lightning arrester prior to prototype making and saves on costly testing set-up and charges. In this paper, the metal oxide arrester has been modelled and analysed using finite element (FE) technique. Standard tests for surge arresters have been simulated with various configurations and these are analysed in the electrical and mechanical domain. The results and analysis of these simulated tests under normal and transient conditions are presented and discussed.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123085111","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 on Room Temperature Vulcanized Silicon Insulation With and Without ATH Filler Loading by Incline Plane Tracking & Erosion Test Method","authors":"Chirag.K. Vibhakar, Rafiq Mathersa, B. Dutta, M. Vasavada, N. Vasudev","doi":"10.1109/ICHVET.2019.8724231","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724231","url":null,"abstract":"Insulation flashovers because of tainting are still a worldwide issue in the power System. In some dirtied areas, up to 33% of all blackout issues are credited to contamination. So strength of the power supply is a first worry in the power System. Robustness in the dielectric materials crosswise over shifting severe conditions is required. Insulator producing has changed over from porcelain and glass protectors to silicon rubber because of its light weight and high mechanical quality and better contaminant opposing execution. Be that as it may, silicon rubber has powerlessness to following and disintegration because of dry band arcing, alongside the qualities like maturing and long haul conduct is obscure. These are the reasons, for which, substitution of the current structure of porcelain coatings in the power System by silicon rubber is troublesome. In this way, Room Temperature Vulcanized (RTV) Silicon coatings is utilized as a part of strong protecting material tending to solutions for these issues. Additionally, resistive properties of RTV covering against contaminant streak over rely on substance structure and filler material. In this way, the present review explores the encasing execution amid following, disintegration and leakage current reviews on RTV Silicon with and without filler stacking examples according to IEC 60587 measures for consistent following voltage. This standard portrays the development of electrical protecting materials utilized under extreme surrounding conditions at power frequencies by estimation of the imperviousness to following and disintegration, utilizing a fluid contaminant and inclined plane examples. For the leakage current estimation, Pico scope interface and a protective circuit were made over the shunt. The leakage current example has been examined with connected voltage for the RTV with and without ATH (Aluminum Tri Hydroxide) filler stacking silicon rubber material. Compound investigation on RTV tests like FTIR, thermal study TGA and morphological study by SEM-EDXA; have been done before and in the wake of following and disintegration test. Comes about and conclusion demonstrates that RTV tests with ATH filler stacking are all the more electrically resistive amid following and disintegration and displays fantastic properties contrasted with RTV tests without ATH filler stacking.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117087322","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":"Understanding of HV Current Transformer Failures During Short-Time Current Tests - An Insight of Current Density Calculations Beyond IEC Standards","authors":"N. M. Rao, B. R. Vasudevamurthy, G. Girija, S. A. Rao, S. Das, R. Deshpande","doi":"10.1109/ICHVET.2019.8724249","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724249","url":null,"abstract":"Abnormal current is the result of a power system fault for which all components must be well designed. And also it is highly difficult to estimate the number of such occurrences in the network. As a part of this, it is very important to design an instrument transformer in a manner that it should withstand short-time thermal current and dynamic currents. In general, these tests have been considered as type tests as per IEC and IEEE standards. Short circuit tests on inductive current transformers shall be made on the primary conductor with all secondary windings short-circuited so that the required thermal energy and peak current is created. Dynamic peak test can be combined with thermal test also but major peak current must be at least rated dynamic current (Idyn). Therefore, primary conductor design is to be given a key attention with regard to short circuit withstand capability. Enough cross sectional area along with its support structure decides the performance during these tests. Otherwise it leads to failure at various instants viz. opening of tank in case of oil filled inductive current transformers, cracking of body in case of dry type current transformers and failure during post accuracy measurements. Further as per IEC standard it is mandatory that the immediate insulation covered on conductor must not show any kind of deterioration. In this paper methodology of short-time thermal current and dynamic current tests as per IEC and IEEE standards have been described. Insights of temperature calculations as per IEEE standards have considered for arriving critical current densities. Further, optimum current densities are proposed for oil filled as well as dry type current transformers. Visual inspection is clearly reviewed and necessary recommendations were made. Few failure case studies were analyzed which further helps to manufacturers to improvise the primary conductor designs and its mechanical structure.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116650812","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":"Switching Capability of Air Insulated High Voltage Disconnectors","authors":"M. Rohmann, Subba Challa, Gurumoorthy Kurra, Sateeswara Mogatala, Dirk Schraeder","doi":"10.1109/ICHVET.2019.8724315","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724315","url":null,"abstract":"Need and realization of air insulated high voltage disconnectors switching capabilities (e.g. bus transfer switching), as well as its limits and challenges will be described and discussed.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122556928","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":"Development of High Dielectric Constant Epoxy Composite with Nano Graphene Platelets","authors":"H. Shivakumar, N. Renukappa, J. S. Rajan, K. Shivakumar","doi":"10.1109/ICHVET.2019.8724299","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724299","url":null,"abstract":"This paper presents the details of fabrication of epoxy graphene nanoplatelet composites with high dielectric constant. Different weight percentages of graphene nanoplatelets of 0.5, 1, 2, 3 and 5 wt.% have been incorporated in to the base epoxy and by using three roll mill, uniform dispersion of the nano filler has been achieved. The variations in dielectric constant and ac conductivity in the frequency range of 100 Hz to 10 MHz and dc voltage-current characteristics have been investigated. From the results, it is observed that the highest dielectric constant is achieved in the epoxy system used with 3 wt % of graphene nanoplatelets. Further, higher dielectric constants are observed only below 1 kHz but at higher frequencies, the dielectric constant is very much reduced. The dielectric constant is also observed to reduce at 5 wt. % of graphene below the values of 3 wt. %. The observed results are explained based on the percolation theory. The results of variations in dielectric constant of the composites are also discussed as a function of frequency at higher temperatures of 50 and 75°C. The DC voltage current characteristics of the composites is also discussed for different weight percentages of graphene.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125519628","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}