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< Page ,Total 17 >
A Semi-Analytical Method to Evaluate Lightning-Induced Overvoltages on Overhead Lines Using the Matrix Pencil Method EI Scopus
期刊论文 | 2018 | IEEE Transactions on Power Delivery
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Abstract :

Lightning electromagnetic fields can couple to overhead power transmission and distribution lines, causing serious effects to the power system. Lightning electromagnetic fields that couple to overhead lines have a non-uniform distribution along the line conductors. Therefore, to ensure the accuracy of the numerical calculation results, a large number of discretization points are needed along the line, which might dramatically increase the computation time since the evaluation of lightning electromagnetic fields in presence of a lossy soil involves, in general, Sommerfeld integrals. This paper proposes a new approach to address this problem. The proposed approach is based on the Agrawal et al. coupling model, in which the horizontal lightning electric field along the line is represented by a series of first-order exponential functions in the frequency domain using the matrix pencil method. The method is highly efficient in terms of computation time since the lightning induced response of the line can be solved semi-analytically. The proposed approach is validated by two different validation examples. IEEE

Keyword :

Distributed parameter circuit Lightning electric field Lightning electromagnetic field Lightning-induced overvoltages Matrix pencil method Non-uniform distribution Power transmission and distributions Semi-analytical methods

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GB/T 7714 Guo, Jun , Xie, Yan-Zhao , Rachidi, Farhad . A Semi-Analytical Method to Evaluate Lightning-Induced Overvoltages on Overhead Lines Using the Matrix Pencil Method [J]. | IEEE Transactions on Power Delivery , 2018 .
MLA Guo, Jun 等. "A Semi-Analytical Method to Evaluate Lightning-Induced Overvoltages on Overhead Lines Using the Matrix Pencil Method" . | IEEE Transactions on Power Delivery (2018) .
APA Guo, Jun , Xie, Yan-Zhao , Rachidi, Farhad . A Semi-Analytical Method to Evaluate Lightning-Induced Overvoltages on Overhead Lines Using the Matrix Pencil Method . | IEEE Transactions on Power Delivery , 2018 .
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高压XLPE绝缘电力电缆缓冲层与金属护层结构设计仿真计算与优化
期刊论文 | 2018 , (3) , 6-12,16 | 电线电缆
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Abstract :

针对近年来电力系统运行的XLPE绝缘高压电缆因缓冲层发生的故障与隐患增多,就缓冲层、金属护层对电缆的作用,通过测量缓冲层等材料的相关参数,运用有限元 (Ansys)软件仿真计算了高压电缆的电场分布,分析了不同优化条件下缓冲层结构的影响,提出了高压电缆缓冲层与金属护层结构设计优化建议.

Keyword :

仿真计算 XLPE绝缘高压电缆 结构设计 缓冲层 金属护层

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GB/T 7714 汪传斌 , 金海云 . 高压XLPE绝缘电力电缆缓冲层与金属护层结构设计仿真计算与优化 [J]. | 电线电缆 , 2018 , (3) : 6-12,16 .
MLA 汪传斌 等. "高压XLPE绝缘电力电缆缓冲层与金属护层结构设计仿真计算与优化" . | 电线电缆 3 (2018) : 6-12,16 .
APA 汪传斌 , 金海云 . 高压XLPE绝缘电力电缆缓冲层与金属护层结构设计仿真计算与优化 . | 电线电缆 , 2018 , (3) , 6-12,16 .
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Experiments on W-band extended interaction oscillator with pseudospark sourced post-accelerated electron beam EI SCIE Scopus
期刊论文 | 2017 , 24 (6) | PHYSICS OF PLASMAS | IF: 1.941
WoS CC Cited Count: 2
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Abstract :

The experimental study of a pseudospark discharge sourced electron beam with post acceleration (PA) is presented. The PA circuit was used to drive a W-band extended interaction oscillator. The experiments showed a significant increase in the output power, with 200 W at 94 GHz measuring corresponding to a 5 times increase in the output power as compared to when post acceleration is not used. The microwave device developed has the advantage of not requiring an external magnetic field making it a low cost, compact, and portable sub-terahertz radiation source. Published by AIP Publishing.

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GB/T 7714 Zhao, J. , Yin, H. , Zhang, L. et al. Experiments on W-band extended interaction oscillator with pseudospark sourced post-accelerated electron beam [J]. | PHYSICS OF PLASMAS , 2017 , 24 (6) .
MLA Zhao, J. et al. "Experiments on W-band extended interaction oscillator with pseudospark sourced post-accelerated electron beam" . | PHYSICS OF PLASMAS 24 . 6 (2017) .
APA Zhao, J. , Yin, H. , Zhang, L. , He, W. , Zhang, Q. , Phelps, A. D. R. et al. Experiments on W-band extended interaction oscillator with pseudospark sourced post-accelerated electron beam . | PHYSICS OF PLASMAS , 2017 , 24 (6) .
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Advanced post-acceleration methodology for pseudospark-sourced electron beam EI SCIE Scopus
期刊论文 | 2017 , 24 (2) | PHYSICS OF PLASMAS | IF: 1.941
WoS CC Cited Count: 7
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Abstract :

During its conductive phase, a pseudospark discharge is able to generate a low energy electron beam with a higher combined current density and brightness compared with electron beams formed from any other known type of electron source. In this paper, a configuration is proposed to postaccelerate an electron beam extracted from a single-gap pseudospark discharge cavity in order to achieve high quality high energy intense electron beams. The major advancement is that the triggering of the pseudospark discharge, the pseudospark discharge itself, and the post-accelerating of the electron beam are all driven by a single high voltage pulse. An electron beam with a beam current of similar to 20 A, beam voltage of 40 kV, and duration of similar to 180 ns has been generated using this structure. The beam energy can be adjusted through adjusting the amplitude of the voltage pulse and the operating voltage of the whole structure, which can be varied from 24 to 50 kV with an efficient triggering method under fixed gas pressure below similar to 10 Pa. Published by AIP Publishing.

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GB/T 7714 Zhao, J. , Yin, H. , Zhang, L. et al. Advanced post-acceleration methodology for pseudospark-sourced electron beam [J]. | PHYSICS OF PLASMAS , 2017 , 24 (2) .
MLA Zhao, J. et al. "Advanced post-acceleration methodology for pseudospark-sourced electron beam" . | PHYSICS OF PLASMAS 24 . 2 (2017) .
APA Zhao, J. , Yin, H. , Zhang, L. , Shu, G. , He, W. , Zhang, Q. et al. Advanced post-acceleration methodology for pseudospark-sourced electron beam . | PHYSICS OF PLASMAS , 2017 , 24 (2) .
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Characteristics and Diffusion of Electrical Explosion Plasma of Aluminum Wire in Argon Gas EI SCIE Scopus
期刊论文 | 2017 , 45 (2) , 185-192 | IEEE TRANSACTIONS ON PLASMA SCIENCE | IF: 1.253
WoS CC Cited Count: 1
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Abstract :

Electrical explosion of aluminum wire is a very promising method for aluminum nanoparticle production. The exploding wire plasma has significant influence on the formation of the nanoparticles. In this paper, the electron temperatures and the electron densities in the plasma are estimated through Boltzmann plot and Stark broadening effect. The aluminum particle densities, charge state distributions, and the energy relaxation in the plasma are estimated accordingly. The diffusion of the plasma into protective argon gas is studied through its spatial distribution. The electron temperatures of the electrical explosion of wire (EEW) plasma with an aluminum wire in argon gas are 1 similar to 2 eV, and the electron densities are of the order of magnitude similar to 1019/cm(3), which decrease rapidly over time after the EEW occurs. The diffusion of the EEW plasma of aluminum wire into ambient argon gas can be divided into two main phases, namely, the previous fast diffusion phase and the subsequent slow diffusion phase. The plasma is with quite different diffusion features due to the differences of the corresponding relative number density of the plasma to argon gas. For plasma with relative density much higher than 1, the diffusion velocity in the fast diffusion phase is significantly higher than that with relative density near 1, and in the slow diffusion phase, the distribution radius of the plasma can continue to increase significantly due to the considerable energy coupled from the circuit to the aluminum particles. Dependence of the plasma radii on the deposited energies are derived from the experimental data. For plasma with relative density near 1, due to the much longer relaxation time during the slow diffusion phase, very little energy can be transferred from the circuit to the aluminum particles and the plasma radii only increase slightly during this phase after the aluminum particles spent most of their kinetic energy in the previous fast diffusion phase.

Keyword :

Diffusion processes plasma relaxation processes explosion velocity measurement

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GB/T 7714 Zhao, Junping , Xu, Zhuo , Yan, Wenyu et al. Characteristics and Diffusion of Electrical Explosion Plasma of Aluminum Wire in Argon Gas [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2017 , 45 (2) : 185-192 .
MLA Zhao, Junping et al. "Characteristics and Diffusion of Electrical Explosion Plasma of Aluminum Wire in Argon Gas" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 45 . 2 (2017) : 185-192 .
APA Zhao, Junping , Xu, Zhuo , Yan, Wenyu , Liu, Haoyu , Zhang, Qiaogen . Characteristics and Diffusion of Electrical Explosion Plasma of Aluminum Wire in Argon Gas . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2017 , 45 (2) , 185-192 .
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Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam SCIE
期刊论文 | 2017 , 24 (3) | PHYSICS OF PLASMAS | IF: 1.941
WoS CC Cited Count: 2
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Abstract :

A pseudospark-sourced electron beam is a promising candidate for driving a THz millimeter wave radiation source. However, the physics governing the electron beam density profile and the beam center deviation from the axis of the structure, which may be caused by the randomness in the pseudospark discharge process, remains still unclear especially for the high energy component of the pseudospark-sourced electron beam, which is usually non-mono-energetic. It is essential to study the electron beam density profile and the beam center position distribution for optimizing the pseudospark discharge configuration. In this paper, images of some single-shot electron beam pulses have been captured using a 50 mu m thickness stopping copper foil and a phosphor screen coated with a P47 scintillator to study the electron beam density profile and the beam center position distribution of the high energy component of the electron beam. The experiments have been carried out on two pseudospark discharge configurations with two different size hollow cathode cavities. The influence of the cathode aperture of each configuration has also been studied according to the beam images. Experimental results show that the beam profile of the high energy component has a Lorentzian distribution and is much smaller than the axial aperture size with the beam centers dispersing within a certain range around the axis of the discharge structure. The pseudospark-sourced electron beam with a larger hollow cathode cavity shows a smaller full width at half maximum radius and a more concentrated beam center distribution. Published by AIP Publishing.

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GB/T 7714 Zhao, J. , Yin, H. , Zhang, L. et al. Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam [J]. | PHYSICS OF PLASMAS , 2017 , 24 (3) .
MLA Zhao, J. et al. "Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam" . | PHYSICS OF PLASMAS 24 . 3 (2017) .
APA Zhao, J. , Yin, H. , Zhang, L. , Shu, G. , He, W. , Phelps, A. D. R. et al. Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam . | PHYSICS OF PLASMAS , 2017 , 24 (3) .
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Influence of Impulse Wave Front Time on Flashover Characteristics of Coaxial Bus line of 220kV GIS EI CPCI-S Scopus
会议论文 | 2017 , 266-269 | 1st International Conference on Electrical Materials and Power Equipment (ICEMPE)
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Abstract :

In order to find out the detection effectiveness of GIS insulation defects when suffering different overvoltages, a coaxial bus line of 220kV with a needle attached to it was established as an experimental sample to simulate the practical condition that there existed a metallic particle on the bus line of real GIS. Research was carried on with the help of 1MV steep-fronted impulse generator. By changing the wave front resistance of Marx generator, different kinds of double exponential impulse voltages could be produced. Influence of wave front time (tf) on 50% discharge voltage (U-50) and voltage-time (v-t) characteristic of GIS was studied in this article. Results indicate that with t(f) increasing, U-50 presents an increasing tendency overall; with pressure (P) increasing, when tf is short, U-50 hardly changes with P, but when t(f) becomes long enough, U-50 changing with P appears as a hump curve. As for v-t characteristic, it turns out that, with the length (l) of needle decreasing, both breakdown voltage and its dispersibility increase; it's also found that the shorter the needle is, the shorter delay that turning point occurs becomes. When tf changes, shape of v-t characteristic changes too, the v-t characteristic integration of different wave front times looks like a concave basin. The above phenomena are explained in the view of the ionization, diffusion and recombination of space charges.

Keyword :

discharge voltage (U-50) space charges 50 voltage-time (v-t) characteristic wave front time (t(f)) Gas-insulated metal-enclosed switchgear (GIS)

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GB/T 7714 Zhang, Lingli , Liu, Xuandong , Guo, Can et al. Influence of Impulse Wave Front Time on Flashover Characteristics of Coaxial Bus line of 220kV GIS [C] . 2017 : 266-269 .
MLA Zhang, Lingli et al. "Influence of Impulse Wave Front Time on Flashover Characteristics of Coaxial Bus line of 220kV GIS" . (2017) : 266-269 .
APA Zhang, Lingli , Liu, Xuandong , Guo, Can , Chen, Ming , Wen, Tao , Zhang, Qiaogen . Influence of Impulse Wave Front Time on Flashover Characteristics of Coaxial Bus line of 220kV GIS . (2017) : 266-269 .
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Pseudospark excited sub-THz frequency sources CPCI-S Scopus
会议论文 | 2017 , 149 | 10th International Workshop on Strong Microwaves and Terahertz Waves - Sources and Applications
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GB/T 7714 Yin, H. , Zhang, L. , Yin, Y. et al. Pseudospark excited sub-THz frequency sources [C] . 2017 .
MLA Yin, H. et al. "Pseudospark excited sub-THz frequency sources" . (2017) .
APA Yin, H. , Zhang, L. , Yin, Y. , Zhao, J. , Shu, G. , He, W. et al. Pseudospark excited sub-THz frequency sources . (2017) .
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Study of Millimetre Wave Extended Interaction Oscillation using Pseudospark-sourced E-Beams EI CPCI-S Scopus
会议论文 | 2017 , 560-563 | 47th European Microwave Conference (EuMC)
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Abstract :

This article presents the investigation of millimetre wave extended interaction oscillation (EIO) using both pencil and sheet-shaped pseudospark (PS)-sourced electron beams. A W-band (75-110 GHz) pencil beam Extended Interaction Oscillator (EIO) was designed and constructed to operate for the first experiment with the output power of 38 W achieved from a four-gap PS discharge operating at 30.5 kV. To increase the output power of the EIO, PS-sourced beam generation was further advanced with an integrated post-acceleration section and a PS sheet-beam.

Keyword :

pseudospark millimetre wave electron beam EIO

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GB/T 7714 Cross, A. W. , Yin, H. , Zhang, L. et al. Study of Millimetre Wave Extended Interaction Oscillation using Pseudospark-sourced E-Beams [C] . 2017 : 560-563 .
MLA Cross, A. W. et al. "Study of Millimetre Wave Extended Interaction Oscillation using Pseudospark-sourced E-Beams" . (2017) : 560-563 .
APA Cross, A. W. , Yin, H. , Zhang, L. , He, W. , Shu, G. , Zhao, J. et al. Study of Millimetre Wave Extended Interaction Oscillation using Pseudospark-sourced E-Beams . (2017) : 560-563 .
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Investigation of millimeter wave extended interaction oscillation using improved pseudospark-sourced electron beams EI Scopus
会议论文 | 2017 , 0 | 42nd International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2017
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Abstract :

This article presents the investigation of millimeter wave extended interaction oscillation using both pencil and sheet-shaped pseudospark (PS)-sourced electron beams. A W-band (75-110 GHz) pencil beam extended interaction oscillator (EIO) was designed and constructed. In the first experiment the output power of 38 W was achieved from a four-gap PS discharge operating at 30.5 kV. PS-sourced beam generation was further improved by combining a single-gap PS structure with an integrated post-acceleration section in order to enhance the beam quality and increase the output power of the EIO to 200W. The study of a PS-sourced sheet beam EIO structure will also be presented. © 2017 IEEE.

Keyword :

Beam generation Extended interaction Extended interaction oscillators Output power Pencil beam Pseudospark Sheet beam W bands

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GB/T 7714 Yin, H. , Zhang, L. , He, W. et al. Investigation of millimeter wave extended interaction oscillation using improved pseudospark-sourced electron beams [C] . 2017 .
MLA Yin, H. et al. "Investigation of millimeter wave extended interaction oscillation using improved pseudospark-sourced electron beams" . (2017) .
APA Yin, H. , Zhang, L. , He, W. , Shu, G. , Zhao, J. , Yin, Y. et al. Investigation of millimeter wave extended interaction oscillation using improved pseudospark-sourced electron beams . (2017) .
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