2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)最新文献

{"title":"Effects of Voltage Stabilziers on the AC and DC Breakdown Strengths of EPDM","authors":"Wei Hu, Chunyang Li, Hong Zhao, Zhenguo Yue, S. Hou, M. Fu","doi":"10.1109/ICEMPE51623.2021.9509003","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509003","url":null,"abstract":"Voltage stabilizers are widely used to improve the electrical tree resistance and breakdown strength of cross-linked polyethylene (XLPE) insulating materials. Ethylene-Propylene-Diene Monomer rubber (EPDM), as a frequently-used material for the enhanced insulation of cable accessories or medium voltage power cable insulation, has also an urgent need for higher breakdown strength. Under working temperature, XLPE is a semi-crystalline polymer while EPDM is an amorphous polymer. As regards whether voltage stabilizers have positive effects in EPDM and whether they are easy to migrate and precipitate out of the rubber which has a loose aggregation structure, little is known. In this work, the effects of four voltage stabilizers on the AC and DC breakdown strengths of EPDM were investigated, and whether the voltage stabilizers are easy to migrate out of EPDM was verified by testing the DC breakdown strength of the samples after degassed in 80 °C vacuum oven for 100 days. Among the selected aromatic voltage stabilizers, only RBBT and AOHBP are slightly effective on improving the AC breakdown strengths of EPDM, while the four voltage stabilizers can all significantly improve the DC breakdown strength, and they are all unlikely to precipitate out of the rubber despite its looser aggregation structure than XLPE, which was confirmed by the further improved DC breakdown strength after degassed for 100d. It is proposed that voltage stabilizers can be expansively used in EPDM rubber to improve its breakdown strength.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"11 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80426391","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":"The Influence of Temperature on Draw Rod System of Converter Transformer Grid Side Bushing","authors":"Li Xining, T. Hao, Yang Fan, Cheng Huanchao, Zhang Shuqi","doi":"10.1109/ICEMPE51623.2021.9509049","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509049","url":null,"abstract":"At present, a typical type oil-paper insulation bushing with draw rod system is widely used as grid side bushing of UHV converter transformer in China. The current carrying and mechanical compensation structure of this special draw rod system is complex, and its internal pulling force and expansion size are affected by environmental temperature, structural size, elastic modulus, expansion coefficient and other factors, which leads to several draw rod system failures. It is urgent to accurately evaluate and verify the influence of draw rod system on the performance of that typical type bushing. Firstly, the calculation model of the draw rod system of the typical type grid side bushing is established. Then, the influence of temperature on the top size expansion and the pressure of the current carrying contact surface in draw rod system are measured, through sensors of temperature, pressure and displacement which are placed on actual gird side bushing. Finally, the calculated results should be compared with the experimental results. It is indicated that these two results are close to each other. The pulling force of the draw rod system increase with the increase of environmental temperature, and the axial load on the bottom contact increases, which accelerates the failure of screw connection. At last, serious discharge fault occurs due to the falling off of bottom contact. The failure mechanism of the current carrying structure at the bottom of the draw rod system under high ambient temperature is analyzed in this paper. The provided results can be a foundation to improve the reliability of the draw rod system of that typical type gird side bushing, as well as condition assessment and quality inspection methods.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"6 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80293234","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":"Numerical Simulation of Influence of Dust on Electric Field Distribution of Insulators in Northwest China","authors":"Jia Guimin, Zhou Yuanxiang, Sui Jiang Yuan, Ma Xudong, Jiang Ling, Wang Shengfu","doi":"10.1109/ICEMPE51623.2021.9509234","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509234","url":null,"abstract":"UHV DC transmission lines have large transmission capacity and have networking functions. Large-scale use of insulators in DC UHV lines is an significant part of ensuring the safe and stable operation of transmission lines. Once a pollution flashover occurs, the losses will be huge. The northwestern region has the characteristics of frequent sand and dust weather and high wind speed. In the sand and dust weather, pollution flashovers and other accidents may occur, causing large-scale blackouts and train delays. In response to the above problems, with the sand and dust environment in Xinjiang Uygur Autonomous Region and Qinghai province as the background, the impact of sand and dust on the electric field distribution of insulators under DC field was studied, and a numerical simulation model of insulator operating characteristics under wind and sand environment was established to analyze wind speed, particle size and concentration of sand dust. The influence of peripheral flow field on the pressure and electric field distribution of composite insulators. The study found that wind and sand have a significant impact on the electric field and potential distribution along the insulator. In a dusty environment, the electric field along the shed at both ends of the insulator is still the largest, and the particle charging makes the electric field at both ends increase, and the field strength distortion intensity near the middle shed Compared with the same position in a clean environment, the field strength value becomes lower; the arc is prone to occur at the high voltage end during sandstorm, and the increase of dust particles can directly distort the field strength along the surface; the effect of wind speed on the surface pressure of the insulator is obvious. With the increase of particle size and concentration, its effect on surface pressure tends to be stable. Severe electric field distortion may cause the insulation performance of insulators to fail. Therefore, it is necessary to pay attention to the influence of wind and sand on the electric field changes of insulators during power grid operation to prevent pollution flashover caused by this.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"6 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80287001","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":"Characteristics Analysis and Experimental Verification of Amorphous Metal Distribution Transformer Core Vibration Coupled by Electromagnetic - Mechanical Field","authors":"Jiacheng Li, Daosheng Liu, Peng Li","doi":"10.1109/ICEMPE51623.2021.9509074","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509074","url":null,"abstract":"With the requirement of high efficiency and low cost for distribution transformer, amorphous metal distribution transformer (AMDT), fabricated by employing amorphous alloy strip as the core, shows a great developmental potential in power equipment industry. However, due to the disadvantages of large magnetostriction and excessive sensitive to stress, the AMDT core can not be fully clamped, which leads to higher vibration magnitude than silicon steel one. The core vibration characteristic analysis environment is a typical multi-physical field, and many researchers tried to calculate the magnetic and dynamic parameters by FEA, but the simulation results are not convinced because of lacking experimental verification. In this paper, a 3-D model of AMDT core was established, and the magnetic flux density and electromagnetic force were calculated by coupling analysis of electromagnetic and mechanical field. To verify the simulation results, a vibration testing platform of the AMDT core was built, and the piezoelectric vibration acceleration sensor were adopted to obtain the vibration signals. The experiment results show that the vibration intensity at upper yoke is larger than other area, which is consistent with the simulation result.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"11 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82217793","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 Modular Over-voltage Trigger Device for Two-electrode Spark-gap Switches","authors":"Xuedi Liu, Zicheng Zhang, Huibo Zhang, Haoran Zhang, Shifei Liu, Longchun Yan","doi":"10.1109/ICEMPE51623.2021.9509071","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509071","url":null,"abstract":"In order to meet the requirement of high repetitive operation of Marx generator, which is normally restricted by the ablation and self-breakdown problems of three-electrode spark-gap switches, a modular over-voltage trigger device for two-electrode spark-gap switches is designed in this paper. The proposed two-electrode spark-gap switches are designed on the basis of an eight-level inductive isolated Marx generator. Numerical simulations and experiments are carried out for a single stage over-voltage trigger device, respectively. The influence of the transformer parameters, pulse width, and peak value of output voltage on the trigger waveform is discussed. Furthermore, the overall simulation model of the Marx-generator triggered using over-voltage triggering method is established. The results show that trigger waveforms with amplitude of 5.8 kV, front edge of 160 ns, and half-width of $1.8 mumathrm{s}$ are achieved for a single stage trigger when the input voltage is 220 V. A programmable SiC MOSFET driver circuit based on FPGA platform is designed and will be used in the following study of the device.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"264 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79720067","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":"Failure Analysis of HVDC Cable Accessories During R&D Tests","authors":"Yi Luo, Mingyu Zhou, T. Fechner, Haitian Wang","doi":"10.1109/ICEMPE51623.2021.9509159","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509159","url":null,"abstract":"HVDC cable accessories are key components of the future electricity transmission system. In the last three years, our team has been working on the research and development of HVDC cable accessories with a voltage level of 500 kV. Until the recently successfully passed type test, multiple failures have been experienced during R&D tests. This paper summarizes and analyses the recorded failures and may serve as a reference for future work on cable accessories design.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"63 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83868943","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":"Preparation and electrical property of carbon foam grounding material by pyrolysis of cyanate esters modified with phosphorus contained Schiff-base","authors":"Mian Fan, H. He, Bo Tan, Xianghan Wang, Xuefang Tong, Min Dai","doi":"10.1109/ICEMPE51623.2021.9509146","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509146","url":null,"abstract":"Compared with metallic grounding material, flexible graphite grounding material is widely applied in grounding field of power system, due to its resistance of corrosion and high impulse current. Novel phosphorus contained Schiff-base is synthesized by 9, 10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide and furfuryl amine, salicylaldehyde, and is incorporating with CE to prepare a carbon foam by property of the resin blend under nitrogen atmosphere. The curing behavior and pyrolysis mechanism of the resin are investigated by DMA, TGA, FTIR and Raman spectrum. The results indicated that incorporating of PSF leads to incomplete combustion during the pyrolysis processing and results in more residues formed. As the consequence, the carbon foam exhibits good electrical conductivity, due to the formed residues consist of graphite structure.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"41 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89510784","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":"Diagnosis of overall 10kV cable insulation state based on transient voltage transfer characteristics","authors":"Qingsong Jie, Qing Yang, Yu Zhang, Hao Cui","doi":"10.1109/ICEMPE51623.2021.9509249","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509249","url":null,"abstract":"The online detection of the cable insulation status is of great significance to ensure the stable operation of the cable. Based on the transmission characteristics of the transient voltage in the cable, this paper proposes a method for detecting the cable insulation state. By establishing the cable distributed parameter model, the relationship between the cable transfer function and the insulation parameters is theoretically deduced. A simulation test platform for cable insulation testing was built based on PSCAD, and the aging of the cable insulation was simulated by changing the thickness of the cable insulation layer and the relative permittivity. The simulation results verified the feasibility of the method.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"2 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89771239","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":"Noise analysis and device improvement of composite probe for space charge measuring based on PIPWP method","authors":"Kong Jiaying, Zhang Yewen, Zebin Cao, Zheng Feihu, T. Qian","doi":"10.1109/ICEMPE51623.2021.9509180","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509180","url":null,"abstract":"In order to find the source of noise signal which always appears in the process when using the composite probe, this paper proposes a hypothesis which is based on experimental facts. Through the establishing a pressure wave transmission model and analyzing the equivalent circuit, the correctness of the assumption is verified from the perspective of time and amplitude. Finally, the noise signal is moved forward by modifying the structure of the composite probe.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"81 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73022865","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 Nano-doping on the Interface Charge Characteristics of SIR/XLPE Composite Insulation","authors":"Chunmiao Ma, Yunxiao Zhang, Yuanxiang Zhou, Ling Zhang, Xin Huang","doi":"10.1109/ICEMPE51623.2021.9509050","DOIUrl":"https://doi.org/10.1109/ICEMPE51623.2021.9509050","url":null,"abstract":"In the accessories of the HVDC cables, cross-linked polyethylene (XLPE) as the main insulation and silicone rubber (SIR) as the accessory insulation form a composite insulation structure. Due to the mismatch of the conductivity and permittivity of the two materials, interface charges will accumulate and affect the electrical properties of the composite insulation under DC voltage. Nano-doping of SIR is one of the means to improve its electrical properties. This paper compares the space charge distribution of the composite insulation composed of nano-TiO2 doped SIR and XLPE and the composite insulation composed of pure SIR and XLPE under different DC electric fields. The experiment results show that nano-doping of SIR can reduce the accumulation of the interface charge in the composite insulation structure when the electric field strength is high, while the interface between pure SIR and XLPE accumulates more charges when electric field strength increases.","PeriodicalId":7083,"journal":{"name":"2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)","volume":"153 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78145994","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}