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Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena最新文献

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Variation of ice surface conductivity during flashover 闪络过程中冰表面电导率的变化
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483767
J. Zhang, M. Farzaneh, X. Chen
{"title":"Variation of ice surface conductivity during flashover","authors":"J. Zhang, M. Farzaneh, X. Chen","doi":"10.1109/CEIDP.1995.483767","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483767","url":null,"abstract":"In this paper, the variation of conductivity of melting water which drips from ice samples during the de-icing process and flashover was investigated. An equivalent surface conductivity was introduced and the relationship between it and the conductivity of freezing water was determined. These results are used in the modeling of flashover along ice-covered insulators.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121466291","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: 16
A new method for solving ionized fields associated with HVDC transmission lines 求解高压直流输电线路电离场的新方法
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483761
Xin Li, M. Raghuveer, I. Ciric
{"title":"A new method for solving ionized fields associated with HVDC transmission lines","authors":"Xin Li, M. Raghuveer, I. Ciric","doi":"10.1109/CEIDP.1995.483761","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483761","url":null,"abstract":"In this paper, a new method for solving the ionized fields associated with HVDC transmission lines is presented. The boundary value problem is transformed into an optimization problem by using the finite element method. Numerical tests on a coaxial cylindrical geometry show that the new method is very efficient. This method has also been applied to a practical line-plane geometry.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"213 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116230860","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: 6
Detection of impulse current caused ageing in valve element of a distribution class metal oxide surge arrester 分布类金属氧化物避雷器阀芯脉冲电流老化的检测
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483708
M. Raghuveer, Xiangxiao Qiu
{"title":"Detection of impulse current caused ageing in valve element of a distribution class metal oxide surge arrester","authors":"M. Raghuveer, Xiangxiao Qiu","doi":"10.1109/CEIDP.1995.483708","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483708","url":null,"abstract":"One of the factors which causes ageing of the valve elements in Metal Oxide Surge Arresters (MOSA) is the passage of current impulses. This paper reports the results of experiments conducted with the valve elements of distribution class MOSA. The valve elements were subjected to a serious of impulse current tests comprising of a specified number of \"shots\" at different current levels up to and including 70 kA. The progressive change in the element characteristics was assessed by application of six diagnostic methods. It is shown that impulse current caused ageing results in an increased magnitude of resistive current flow. As ageing progresses the resistive current becomes asymmetrical. Although the ageing is irreversible it is possible to maintain symmetry to the resistive current if the valve element is subjected to impulse current passages in the opposite direction. The effectiveness of the diagnostic methods in detecting impulse current caused ageing is discussed.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123713405","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
Computer modelling of Trichel pulses in air 空气中Trichel脉冲的计算机模拟
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483590
J. MacAlpine, W. Yim
{"title":"Computer modelling of Trichel pulses in air","authors":"J. MacAlpine, W. Yim","doi":"10.1109/CEIDP.1995.483590","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483590","url":null,"abstract":"A program has been developed to model negative corona pulse trains (Trichel pulses) in air. A spherically-symmetrical system comprising a small negatively-charged spherical electrode concentric with a large grounded spherical electrode was used. This system facilitates calculation of fields and charged particle densities in the air-gap as compared with the conventional point/plane electrode where only the axial field is usually considered. To test the program, an equivalent practical geometry was used: a hemispherically-tipped electrode concentric with a large concave hemispherical electrode. Recordings of pulse rates over a range of pressures from 0.2 to 1 bar were made over the voltage range for which corona pulses were produced: these were found to give good agreement with the pulse rates obtained at the same voltages and pressures from the simulation. The shape of the individual pulses was also closely similar to those recorded.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123543973","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: 8
Gas/adsorbent interaction dynamics: an experimental approach 气体/吸附剂相互作用动力学:实验方法
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483599
T. Lussier, M. Frechette, R. Larocque
{"title":"Gas/adsorbent interaction dynamics: an experimental approach","authors":"T. Lussier, M. Frechette, R. Larocque","doi":"10.1109/CEIDP.1995.483599","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483599","url":null,"abstract":"A procedure for the study of gas/adsorbent dynamics is presented. As an example, the interaction between CO/sub 2//He with trace amount of CF/sub 4/ and alumina was studied under low-level CO/sub 2/ concentrations. Gas chromatography coupled with a thermal conductivity detector was utilized for assessing the temporal variation of the compound concentrations. The chromatographic technique allowed to follow the CO/sub 2/ and CF/sub 4/ concentrations with a precision of 15 ppm, and 1 ppm, respectively. Up to CO/sub 2/ contents of 10/sup 4/ ppm/sub v/, the results showed that the interactional dynamics is controlled by the magnitude of the initial concentration. The sorption capacity of alumina was found to be low, not exceeding 0.5% g [CO/sub 2/]/g alumina. Considerations based on the material properties were made explicit in order to explain the preferential CO/sub 2/ adsorption by alumina.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124932804","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: 11
Recovery conditions for AC arc on ice surfaces 冰面上交流电弧的回收条件
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483746
X. Chen, M. Farzaneh, J. Zhang
{"title":"Recovery conditions for AC arc on ice surfaces","authors":"X. Chen, M. Farzaneh, J. Zhang","doi":"10.1109/CEIDP.1995.483746","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483746","url":null,"abstract":"This paper presents the results of research undertaken with the aim of obtaining the recovery conditions for an AC arc on iced surfaces. Using a cylindrical ice sample, the relationship linking the arc current, minimum arc recovery voltages and the voltage across the arc may be obtained. The results provided by this model may be used to calculate the AC flashover voltage of industrial ice-covered insulators.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126062508","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
Electrohydrodynamic instability and electrical discharge initiation in hexane 正己烷中电流体动力学不稳定性和放电起始
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483601
K.L. Stricklett, R. Altafim
{"title":"Electrohydrodynamic instability and electrical discharge initiation in hexane","authors":"K.L. Stricklett, R. Altafim","doi":"10.1109/CEIDP.1995.483601","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483601","url":null,"abstract":"An experimental technique is described that tests the hydrodynamic stability of the fluid boundary in a fluid-insulated system: A quasi-uniform field configuration is used and a pulsed, Nd:YAG laser is employed to create a micro-bubble at the surface of one electrode. The gap is pulse-charged and the laser is synchronized with the time-of-application of the voltage pulse. Under appropriate experimental conditions of voltage and laser pulse energy, the bubble evolves to produce full electrical breakdown by the onset and propagation of instabilities in the bubble surface. Experimental data obtained in hexane are presented.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124729017","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
Charge transport through polymer thin films for second order nonlinear optics 二阶非线性光学聚合物薄膜中的电荷输运
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483808
T. Pasmore, J. Talbot, H. Lackritz
{"title":"Charge transport through polymer thin films for second order nonlinear optics","authors":"T. Pasmore, J. Talbot, H. Lackritz","doi":"10.1109/CEIDP.1995.483808","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483808","url":null,"abstract":"Charge transport through molecularly doped polymer thin films for second order nonlinear optical applications has been investigated using Monte Carlo simulations. By implementing disorder into the molecular energetics to approximate the polymer properties, a simulation has been developed to calculate time of flight current transients. The dopant molecules, nonlinear optically active chromophores, are modeled as individual sites with a discrete energy spectra, while the monomer units of the polymer matrix are modeled as individual sites with energies described by a single gaussian distribution. Parameters such as temperature, magnitude of the applied electric field, and chromophore concentration are used in the simulation to predict physically realistic processing conditions. Other important parameters include the size and shape of the dopant chromophores, the polarity and polarization effects of both the polymer and chromophore, and the intermolecular interaction between the chromophore and polymer molecules. Dielectric relaxation and isothermal current decay measurements are being used to experimentally determine the magnitude of the intermolecular interactions. The characterization of charge transport properties is crucial to the development of any potential second order nonlinear optical device.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125079367","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
Experimental investigation of the influence of different wetting conditions on DC strength of a flat insulating surface 不同润湿条件对平坦绝缘表面直流强度影响的实验研究
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483764
L. Tang, M. Raghuveer, N. J. Tarko
{"title":"Experimental investigation of the influence of different wetting conditions on DC strength of a flat insulating surface","authors":"L. Tang, M. Raghuveer, N. J. Tarko","doi":"10.1109/CEIDP.1995.483764","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483764","url":null,"abstract":"This paper reports some results of experiments conducted using a flat plate geometry, in order to understand the unevenly wetted DC wall bushing flashover problem. Two basic configurations are considered, i.e. a bushing-type configuration in which both longitudinal and normal electric field components exist and an insulator-type configuration in which the longitudinal component of E-field is dominant. The electric field distributions of these configurations under different surface conditions are mapped, and the influence of uneven wetting conditions on the E-field distribution and DC flashover are investigated.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125413763","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
Monitoring insulation surface conditions using neural networks 利用神经网络监测绝缘表面状况
Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1995-10-22 DOI: 10.1109/CEIDP.1995.483738
D. Auckland, M. Uğur, B. Varlow
{"title":"Monitoring insulation surface conditions using neural networks","authors":"D. Auckland, M. Uğur, B. Varlow","doi":"10.1109/CEIDP.1995.483738","DOIUrl":"https://doi.org/10.1109/CEIDP.1995.483738","url":null,"abstract":"Surface tracking in solid insulators is an unwanted phenomenon, which cannot be accurately predicted. A wide range of relays can detect failure in a transmission line and prevent a total breakdown in the system, but in many cases it is too late to save the insulator from total damage. The method described here is mainly employed in detecting several conditions, such as discharges, leakage current, dry conditions, severe damage and tracking initiation. Initially a BPN (back propagation network) type neural network is trained with different signal types. Due to the nature of neural networks, which always require similar values for input nodes, the system uses the FFT of the input signal, which might have high amplitude frequency components other than the fundamental frequency due to the conditions on the surface. The system works on a real time basis and is able to make an estimate every 2-3 seconds, which can be reduced to milliseconds by using fast DSP boards. The program warns the user with the first indication of severe damage on the surface and can protect the insulator from excessive damage.","PeriodicalId":121919,"journal":{"name":"Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131144880","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: 3
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