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检索条件"机构=8State Key Laboratory of Advanced Electromagnetic Engineering and Technology"

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Arc erosion characteristics of nanocrystalline CuCr contact material

Arc erosion characteristics of nanocrystalline CuCr contact ...

引用

2011 1st International Conference on Electric Power Equipment - Switching technology, ICEPE2011

作者： Zhao, Laijun Li, Zhenbiao Zhou, Youwu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China College of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 China

ISBN: (纸本)9781457712722

The objective of this paper is to investigate vacuum arc erosion characteristics of a nanocrystalline CuCr (Cr 50 wt%) contact material. The vacuum contact simulation device was used to conduct contact materials arc erosion tests, and voltage waveforms of make and break arcs between the electrodes were recorded with LabVIEW. Using electricity-ray analytical balance and scanning electron microscopy, the mass loss and the surface structure of CuCr contact materials were obtained. Experiments indicate that the average break arc duration and the cathode contact mass loss of nanocrystalline CuCr50 material were higher than those of two microcrystalline CuCr50 materials. The eroded contact surface structure showed a clear difference: the cathode contact surface of nanocrystalline CuCr50 contact material was uniform, while each cathode contact surface of two microcrystalline CuCr50 materials had an obvious arc erosion pit. © 2011 IEEE.

关键词： Binary alloys

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A new tool for lightning performance assessment of overhead transmission lines

A new tool for lightning performance assessment of overhead ...

引用

2011 7th Asia-Pacific International Conference on Lightning, APL2011

作者： Xie, Yaoheng Dong, Manlin He, Hengxin He, Junjia Cai, Hansheng Chen, Xipeng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China China Southern Power Grid Electric Power Research Institute Guangzhou China

ISBN: (纸本)9781457714665

A new tool has been developed for the evaluation of the lightning performance of overhead transmission lines. The tool can take into account actual ground flash density distribution along line corridor, cumulative probability function of the lightning current, geometric parameters, insulator string configuration and the topography for each tower of the entire line, etc. Moreover, the tool incorporates several lightning attachment models and a method of ATP-based automated simulation for lightning surge analysis. An application to a typical 500 kV double circuit line of the Chinese transmission system shows that it is convenient for estimating the lightning performance of a total line and studying the effects of different models and criteria on the lightning performance of the line. © 2011 IEEE.

关键词： Electric lines

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Observation on the attachment processes of competition tests under switching impulse voltage

Observation on the attachment processes of competition tests...

引用

2011 7th Asia-Pacific International Conference on Lightning, APL2011

作者： Xie, Shijun He, Hengxin He, Junjia Chen, Weijiang Chen, Jiahong Gu, Shanqiang Xiang, Nianwen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Corporation of China Beijing China State Grid Electric Power Research Institute Wuhan China

ISBN: (纸本)9781457714665

The attachment processes of competition tests under switching impulse voltage were studied in this paper. A series of competition tests with rod-rod gap configuration for these studies were carried out. In these competition tests, a high-speed CCD video camera was used to clarify the attachment processes, assisting by current measurement of the grounded rods and the voltage measurement of the discharge gap. The experimental results indicated that the processes can be divided into two stages related to the downward discharge and the upward discharge respectively, both in positive and negative competition tests. However, the scale of the two stages and the discharge process in the two stages are different, and these differences affect the striking probability finally. © 2011 IEEE.

关键词： Electric grounding

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Theoretical analysis of surface microwave discharge resonantly excited by surface plasmon polaritons

Theoretical analysis of surface microwave discharge resonant...

引用

2011 Cross Strait Quad-Regional Radio Science and Wireless technology Conference, CSQRWC 2011

作者： Chen, Zhaoquan Hong, Lingli Hu, Yelin Zheng, Xiaoliang Yang, An Li, Ping Zhu, Longji Liu, Minghai Cheng, Lili Zhou, Qiyan Hu, Xiwei College of Electrical and Information Engineering Anhui University of Science and Technology Huainan Anhui 232001 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China

ISBN: (纸本)9781424497904

The generation mechanism of surface microwave discharge is studied by analyzing the simplified surface-wave plasma model, from which we show the spatial distribution characteristics of the surface electromagnetic waves. According to the characteristics of overdense plasma interacting with high-frequency electromagnetic waves, we get there is the surface plasmon polaritons (SPPs) phenomenon placed at the interface between overdense plasmas and dielectric. The characteristic parameters of SPPs in overdense plasmas are obtained by altering the plasma density and the collision frequency. © 2011 IEEE.

关键词： Plasma density

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Slot-array antenna devising for surface microwave discharge of surface plasmon polaritons

Slot-array antenna devising for surface microwave discharge ...

引用

2011 Cross Strait Quad-Regional Radio Science and Wireless technology Conference, CSQRWC 2011

ISBN: (纸本)9781424497904

The production of surface microwave discharge is verified as a stable discharge excited by surface electromagnetic waves which is carried by surface plasmon polaritons. In order to achieve the purpose of coupling microwave energy efficiently and surface-wave discharge stably, in addition based on the dipole near-field radiation theory, we design the subwavelength diffraction grating. Moreover, the near-field radiation electric field distribution is studied by special proposed computation method and further the aim of design is achieved. © 2011 IEEE.

关键词： Photons

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Research on overload protection inverse time characteristic for pumped storage generator-motors

Research on overload protection inverse time characteristic ...

引用

2011 IEEE Power engineering and Automation Conference, PEAM 2011

作者： Fu, Qiuling Yin, Xianggen Luo, Hang Li, Zhenxing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China Electrical Power Security and High Efficiency Laboratory Huazhong University of Science and Technology Wuhan Hubei 430074 China

ISBN: (纸本)9781424496884

Overload protection plays an important role in safeguarding the operation security and efficiency of large-capacity pumped storage units. Different types of inverse time characteristics of overload protection are utilized in practical protection devices. In order to improve the performance of overload protection in practical applications, a real pumped storage unit model is adopted to analyze the relationship among different inverse time characteristics of overload protection. © 2011 IEEE.

关键词： Electric equipment protection

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Appling improvement of the inverse time overload protection of large generating units

Appling improvement of the inverse time overload protection ...

引用

2011 IEEE Power engineering and Automation Conference, PEAM 2011

作者： Fu, Qiuling Yin, Xianggen Li, Xinjing Li, Zhenxing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China Electrical Power Security and High Efficiency Laboratory Huazhong University of Science and Technology Wuhan Hubei 430074 China

ISBN: (纸本)9781424496884

Inverse time protection is widely used in overload protection scheme of large generating units, but the operation curve adopted by inverse-time overload protection is different from the practical overload curve of generating units. Hence, there are many inconveniences for application of inverse-time overload protection. Problems about constitution of inverse-time characteristic curve, realization of micro-computer and curve-fitting are analyzed in this paper. Setting principles for inverse-time overload protection of large generating units are described, based on its application in protection scheme of large-scaled generating units installed in Three Gorges Right Bank Power Station. © 2011 IEEE.

关键词： Curve fitting

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Mechanical monitoring and risk assessment under ice disaster based on wireless sensor network

Mechanical monitoring and risk assessment under ice disaster...

引用

2011 IEEE Power engineering and Automation Conference, PEAM 2011

作者： Liu, Yingtong Yin, Xianggen Xu, Jian Li, Zhenxing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China Electrical Power Security and High Efficiency Laboratory Huazhong University of Science and Technology China Faculty of Electrical Engineering Wuhan University Wuhan Hubei 430074 China

ISBN: (纸本)9781424496884

Ice disaster has becoming a significant threat to power system security since recent years. Wireless sensor networks guarantee reliability of information communication under ice disasters, due to their self-organization and the advantage that master stations are not involved. It is recommended to be applied on power grid structure security monitoring and assessment. It is proposed that different type of sensor nodes should be settled on overhead transmission lines, to comprehensively monitor mechanical status of a certain area. A two-layer sensor network model is presented for overcoming the communication range limitations of sensor nodes. Using the data obtained, a novel power system financial risk assessment method is proposed to balance the probability and seriousness of icing caused supports break, which helps grid structure progress in a long term. © 2011 IEEE.

关键词： Risk assessment

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Fault location in distribution networks using Prony analysis

Fault location in distribution networks using Prony analysis

引用

2011 International Conference on advanced Power System Automation and Protection, APAP 2011

作者： Tang, JinRui Yin, XiangGen Zhang, Zhe He, ZhiQin Ye, Lei Wang, Yuxue State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Hubei Electric Power Security and High Efficiency Key Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424496198

This paper proposes a new fault location method in distribution networks using Prony analysis. This method just needs the measured voltage transients without multi-recording nodes. Fault-originated traveling waves propagate along the distribution network and reflect at the discontinuity points, so the recorded transients contain some characteristic frequencies associated with specific paths, which can reveal the fault position. Firstly, model and simulate the distribution network using PSCAD/EMTDC to get the recorded signals associated with the typical fault positions. Secondly, extract the frequencies of the recorded signal using Prony analysis to generate the database for fault location. Finally, the real fault-originated signal will be analyzed to locate the fault point by searching the database for fault location based the matching rule. The matching rule is the least squares between the frequencies of the real fault-originated signal and the frequencies corresponding one typical fault position in the database. The simulation results demonstrate that the method is practical, reliable and effective. © 2011 IEEE.

关键词： Electric power distribution

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Observation of the positive leader propagation in the inverted rod-plane gap

Observation of the positive leader propagation in the invert...

引用

2011 7th Asia-Pacific International Conference on Lightning, APL2011

作者： He, Hengxin Xiang, Nianwen Gu, Shanqiang Chen, Jiahong Chen, Weijiang Xie, Shijun He, Junjia State Grid Electric Power Research Institute Wuhan 430074 China State Grid Corporation of China Beijing 100031 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781457714665

The characteristics of the positive leader propagation in the inverted rod-plane gap are investigated in this paper. The discharge experiments in a 3-m inverted rod-plane gap were carried out under switching impulse voltage. The positive leader propagation process was recorded by using a high speed CCD camera. The aspects to describe the positive leader propagation characteristics of the inverted rod-plane gaps are obtained and compared with the traditional rod-plane gaps. The critical corona radius and continuous leader inception voltage of rod derived in the 3-m inverted rod-plane gap are lower than that of the traditional rod-plane gaps. © 2011 IEEE.

关键词： CCD cameras

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