2019 International Conference on High Voltage Engineering and Technology (ICHVET)最新文献_第6页

Analysis of Brittle Fracture of Composite Insulators by Using Finite Element Technique 复合绝缘子脆性断裂的有限元分析

2019 International Conference on High Voltage Engineering and Technology (ICHVET) Pub Date : 2019-02-01 DOI: 10.1109/ICHVET.2019.8724162

N. P., Ravindran Kn, V. N

{"title":"Analysis of Brittle Fracture of Composite Insulators by Using Finite Element Technique","authors":"N. P., Ravindran Kn, V. N","doi":"10.1109/ICHVET.2019.8724162","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724162","url":null,"abstract":"The Brittle fracture process causes cracks on the FRP rod of the Composite (Composite) insulator that leads to premature failure of Composite insulators. Major types of stress affecting the service life of an insulator are electrical, mechanical and environmental stress whereas the major physical threat is vandalism. For various transmission and subtransmission voltages, the insulators are required withstand the maximum tensile strength of the conductor. Therefore, understanding the mechanical stress withstanding capability of Composite insulator is important. Proper designing of the strength of FRP (Fibre Reinforced Plastic) rod is most important. FEA (Finite Element Analysis) analysis of voltage distribution along the length of the Composite insulator is also necessary for the understanding of electric field stress required for surface deterioration of Composite insulator. The mechanical stress analysis for various cross sections of FRP rods for a given mechanical load has to be carried out in order to optimize the diameter of the FRP rod for better reliability. FRP rods of different diameter were considered, it is observed that when diameter is increased the maximum stress is reduced and hence, by increasing the diameter of FRP road better results can be obtained. It is also observed that displacement is more in FRP rod of lower diameter.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"23 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":"115776831","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

Study of Reactive Power Consumption for Different Core Material of Distribution Transformers 配电变压器不同铁芯材料的无功功耗研究

2019 International Conference on High Voltage Engineering and Technology (ICHVET) Pub Date : 2019-02-01 DOI: 10.1109/ICHVET.2019.8724302

G. K. Kumar, Nithin Kumar, R. Kumar

{"title":"Study of Reactive Power Consumption for Different Core Material of Distribution Transformers","authors":"G. K. Kumar, Nithin Kumar, R. Kumar","doi":"10.1109/ICHVET.2019.8724302","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724302","url":null,"abstract":"Transformer in the Electrical network is the vital link between Generation, Transmission and Distribution. The magnetic circuit present forms the strategic link between primary and secondary. This link is due to the Electrical steel present in the Magnetic circuit, which is responsible for the flux linkage between the windings in the Transformers. The magnetic material used and its properties affects the efficiency of the Transformer. Due to high cost of Electrical steel, there are certain instances that inferior grade and core material from the dismantled Power Transformers are used in small rating Distribution Transformers affecting the reliability of the Distribution Network. The experimental study was conducted on 3 numbers of 25KVA Distribution transformers of identical designs are made with three different Cold Rolled Grain Oriented (CRGO) core material i.e., Prime CRGO material (New), Used CRGO core material (Removed from transformer after service of 20 years) and Mixed core (placing one new and one used lamination in alternating manner). This paper discusses the study on variation of Reactive Power consumption of different core materials and of the Distribution Transformers made with CRGO cores. And also, the changes in the Magnetizing Reactance in the Transformer. The Epstein results @ 1.5 tesla shows the deterioration in the magnetic properties for used core material as there is increase in reactive power. The transformer open circuit test results at 112% of rated voltages are very predominant in both Mixed and Used core transformer for Active and Reactive power. The results show that these transformers are probable to saturate at small changes in the voltages.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"120 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":"123235912","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

Numerical Investigation of Particle Effect on Water Drop Under High Voltage Silicone Rubber Insulator 高压硅橡胶绝缘子下水滴颗粒效应的数值研究

2019 International Conference on High Voltage Engineering and Technology (ICHVET) Pub Date : 2019-02-01 DOI: 10.1109/ICHVET.2019.8724263

Vinit Srivastava, B. Rajpurohit, M. Kaur

{"title":"Numerical Investigation of Particle Effect on Water Drop Under High Voltage Silicone Rubber Insulator","authors":"Vinit Srivastava, B. Rajpurohit, M. Kaur","doi":"10.1109/ICHVET.2019.8724263","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724263","url":null,"abstract":"Surface roughness due to the presence of particle settling leads to frequent discharges, flashovers on the insulator surface and reducing the breakdown voltages of the insulators, hence it is necessary to investigate the effect of the presence of particle over silicone rubber insulator. In this paper, the work has been done to investigate the electrostatic effects on the triple point junction due to the presence of the particle deposited around the water drops under high voltage stress. In this paper, four cases have been investigated from the electric field and polarization density distribution point of view. First by changing particle position, second by changing relative permittivity of the particle, third by changing the number of particles and forth by changing the particle size. All four cases have been investigated by using finite element method based software in 2D space dimension. This software is used for numerical calculation of normalized electric field and polarization density distribution. The simulation results showed that, at the triple point junction, the electric field and polarization density has been shifted from the both sides end of the drop to the left-hand side where the particle heterogeneity is present. Furthermore, the electric field and polarization density have also been increased as particle came near to water drop, as relative permittivity of the particle is increasing, the number of particles is increased and as the size of the particle is decreasing.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"35 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":"132115607","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

Optimization of LV Winding Lead Routing in Three Phase Power Transformers to Minimize Induced Losses in Tank 三相电力变压器低压绕组引线走线优化以减小槽内感应损耗

2019 International Conference on High Voltage Engineering and Technology (ICHVET) Pub Date : 2019-02-01 DOI: 10.1109/ICHVET.2019.8724272

Pradeep Adusumilli, M. M. Bhaway

{"title":"Optimization of LV Winding Lead Routing in Three Phase Power Transformers to Minimize Induced Losses in Tank","authors":"Pradeep Adusumilli, M. M. Bhaway","doi":"10.1109/ICHVET.2019.8724272","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724272","url":null,"abstract":"The most economical design of a power transformer, taking capitalization costs into account, should offer a compact design with minimum stray losses. The design clearances between the tank on low voltage (LV) side and active part is dependent on induced magnetic flux density which generates eddy currents and resulting hot spot temperatures. Design of tank with clearances below the required values will lead to increase in tank eddy losses, while large tank clearances make the equipment uneconomical. The stray losses in structural components of large rating transformers account for 20-30% of the total load losses. The common practice of minimizing these losses is by arrangement of magnetic laminated shunts or copper screens on tank wall, which minimizes the incident winding leakage flux from reaching the tank. However, in higher rating transformers the additional flux generated by leads pose a serious problem, as the tangential flux generated by the high current carrying leads cannot be effectively shunted or screened by above arrangements. The distribution of eddy currents on the tank surfaces is quite complex, especially for higher rating three phase transformers where high current carrying LV leads are routed from winding bottom end to the turret covering the whole of top tank. Investigations were carried out on 3D electromagnetic model of three phase transformer to evaluate the eddy current distribution and resultant losses in tank wall for different combinations of lead routing. Based on the detailed studies, an optimal routing of LV leads is proposed, which will minimize the induced losses and hot spot temperatures in large three phase power transformers.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"405 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":"127597847","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

Investigation of the Effect of High Voltage Impulse Stress on Transformer Oil by Infrared Spectroscopy 高压冲击应力对变压器油影响的红外光谱研究

2019 International Conference on High Voltage Engineering and Technology (ICHVET) Pub Date : 2019-02-01 DOI: 10.1109/ICHVET.2019.8724336

S. Karmakar, Anurag Dutta, Hussain Kalathiripi

{"title":"Investigation of the Effect of High Voltage Impulse Stress on Transformer Oil by Infrared Spectroscopy","authors":"S. Karmakar, Anurag Dutta, Hussain Kalathiripi","doi":"10.1109/ICHVET.2019.8724336","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724336","url":null,"abstract":"With the aging of transformers, degradation of internal condition occurs and as a result, they become more susceptible to failures. Extreme conditions like lightning strikes, switching transients, short circuits or other incidents cause failures in transformers. Among these, lightning strikes and switching transients are impulsive in nature and have a degrading effect on transformer insulation. The most widely used insulating liquid for high voltage transformers is mineral oil because it performs the functions of cooling as well as electrical insulation. Due to lightning strikes and switching impulses, transformers are subjected to massive electrical as well as thermal stresses, causing degradation of the insulating oil present inside the transformer. Hence, impulse testing of transformer oil is of utmost importance. All the three characteristics of transformer oil viz. electrical, physical and chemical were examined. The breakdown voltage (BDV) test was carried out to evaluate the electrical characteristics. The refractive index test was done to assess the physical characteristics and the Fourier transform infrared spectroscopy (FTIR) was performed to evaluate the chemical characteristics of the transformer oil.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"22 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":"128681761","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: 5

Ageing Characteristics of Alkali Neutralized Neem oil for Liquid Insulation 液体绝缘用碱中和印楝油的老化特性

2019 International Conference on High Voltage Engineering and Technology (ICHVET) Pub Date : 2019-02-01 DOI: 10.1109/ICHVET.2019.8724216

Ann Pamla Cruze, K. Lokesh

{"title":"Ageing Characteristics of Alkali Neutralized Neem oil for Liquid Insulation","authors":"Ann Pamla Cruze, K. Lokesh","doi":"10.1109/ICHVET.2019.8724216","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724216","url":null,"abstract":"Mineral insulating oil is used in transformers and electrical equipments as an insulant and coolant. After prolonged usage, these oils deteriorate and progressively develop sludge and need to be replaced. Disposal of the waste insulating oil leads to contamination of natural resources. There is a need to find an alternative source for insulating oils. This study explores the possibility of using alternative insulating oils that are safe to dispose off after use. Experiments are carried out using non-edible vegetable oil extracted from neem seeds as a source of sustainable and environment-friendly insulating oil. Characteristics such as viscosity, acidity, electric strength, dielectric dissipation factor, resistivity, flash point and fire point have been evaluated. The results of crude neem oil are compared to the acceptable limits of IEC 62770 - 2013 to understand the suitability of crude neem oil. It is found that crude neem oil has acceptable values with respect to density, viscosity, electric strength, flash point and fire point values and poor performance with respect to total acidity dielectric dissipation factor, specific resistance. Hence, the crude neem oil is processed by alkali neutralization followed by vacuum filtration to alter the performance of crude neem oil. The alkali neutralized neem oil shows better performance with respect to acidity, dielectric dissipation factor, specific resistance, electric strength parameters and flash point and fire point values. Further, the processed oil is subjected to ageing conditions to study the long term performance of the alkali neutralized neem oil.","PeriodicalId":165193,"journal":{"name":"2019 International Conference on High Voltage Engineering and Technology (ICHVET)","volume":"44 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":"131215478","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

Design and Simulation of Re-Ignition Circuit for Synthetic Testing of HV/EHV Circuit Breakers 高压/超高压断路器综合试验重点火电路的设计与仿真

2019 International Conference on High Voltage Engineering and Technology (ICHVET) Pub Date : 2019-02-01 DOI: 10.1109/ICHVET.2019.8724200

Rajaramamohanarao Chennu, Sudhakara Reddy S, Anupam Awasthi, Maroti

引用次数: 2

Life Estimation of XLPE Cable Under Electrical and Thermal Stress 电热应力下交联聚乙烯电缆的寿命估算

2019 International Conference on High Voltage Engineering and Technology (ICHVET) Pub Date : 2019-02-01 DOI: 10.1109/ICHVET.2019.8724227

Darshan Prakash Borthakur, S. Das

{"title":"Life Estimation of XLPE Cable Under Electrical and Thermal Stress","authors":"Darshan Prakash Borthakur, S. Das","doi":"10.1109/ICHVET.2019.8724227","DOIUrl":"https://doi.org/10.1109/ICHVET.2019.8724227","url":null,"abstract":"Estimating the lifetime of XLPE insulated cables is utmost important as it determines the reliability of the cable under service. The cable insulation under normal service condition experiences various stress such as cyclic thermal stresses associated with load cycles, electric stress produced due to applied voltage, humidity etc. In this work, lifetime of a single core 33 kV XLPE insulated cable being employed in wind farms is estimated, considering the impact of different stress conditions. The effect of electrical stress i.e. produced due to applied voltage, thermal stress associated with load cycle and combination of both the stresses are studied. The electric field and thermal stress distibution analysis in cable insulation is carried out using FLUX, an electromagnetic field and thermal distribution analysis software. The stress values obtained from FLUX are used in insulation life models to estimate the approximate life of XLPE cable insulation. Further, the lifetime analysis is performed at higher stress levels compared to rated conditions in order to understand the feasibility to carried out experiments under laboratory conditions. This study shows that electrical and thermal stress has strong impact on insulation lifetime. Also it is observed that the estimated life depends on applied voltage profile and insulation thickness. In addition, the lifetime estimation models also plays an important role.","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":"114055497","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: 4

2019 International Conference on High Voltage Engineering and Technology (ICHVET2019) 2019高压工程与技术国际会议(ICHVET2019)

2019 International Conference on High Voltage Engineering and Technology (ICHVET) Pub Date : 1900-01-01 DOI: 10.1109/ichvet.2019.8724221

引用次数: 0