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Journal articles on the topic 'UHV'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Li, Long, Liangliang Cheng, Xiang Li, Lingping Yue, and Hongbin Zhang. "Research on Multi Machine Cooperative Autonomous Inspection Strategy for UHV Dense Transmission Channel Based on 5G Technology." Journal of Sensors 2022 (August 25, 2022): 1–11. http://dx.doi.org/10.1155/2022/8524817.

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With the continuous progress of UAV technology and 5G technology, the safety and reliability of UAV are gradually improved. In addition, UAV has many advantages, such as light weight, small size, low cost, and fast response in view of the low economy, high labor intensity, low efficiency, and other problems of the traditional inspection of UHV intensive transmission channels. This paper proposes a multi machine collaborative autonomous inspection scheme for UHV dense transmission channels based on 5G technology. This method is to realize the intelligent detection service for UHV dense transmis

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2

Li, Yong, Xin Ge, and Xue Liang Hou. "The Research of Application Mode of Unmanned Aircraft Patrol in UHV Transmission Lines." Applied Mechanics and Materials 536-537 (April 2014): 989–92. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.989.

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In the UHV AC transmission lines will be rapid development momentum of main frame China grid, inspection of UHV transmission line for the realization of unmanned aircraft utility,this article makes an analysis for the structure characteristics and defects of the UHV transmission line , finds out the defect characteristics, and summarizes the characteristics of the UAV and inspection instrument. According to the characteristic of UHV defect, we display its properties of unmanned aerial vehicles and inspection instrument, construct the application mode of four kinds of unmanned aerial vehicle in

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3

Gockenbach, Ernst. "UHV technology." e & i Elektrotechnik und Informationstechnik 129, no. 4 (2012): 192–99. http://dx.doi.org/10.1007/s00502-012-0023-2.

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4

Lei, Ting, Zhiwen Xie, Ke Wang, Liqiang Zhong, and Dekai Chen. "Control and application of ultra-high voltage insulator cleaning and detecting robot." Journal of Physics: Conference Series 2087, no. 1 (2021): 012044. http://dx.doi.org/10.1088/1742-6596/2087/1/012044.

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Abstract With the development of global energy Internet and demand for UHV transmission, uHV transmission lines will increase rapidly and become more and more important for national economic development. The uHV transmission lines will increase year by year and become increasingly important to the economic development of the country. It is necessary to study the cleaning and detection technology of transmission line insulators that the insulators of UHVDC transmission lines such as large leakage rate, low detection efficiency and difficult cleaning of insulators. Therefore, the development of

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5

Zheng, Xu, Jiang Hong Wang, Mei Li, et al. "Impacts of UHV on Short Circuit Currents in China's Central 500kV Grid and Its Countermeasures." Advanced Materials Research 960-961 (June 2014): 891–95. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.891.

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Ultra-high voltage (UHV) projects are making power system growing lager and resulting in sharp increase of short circuit currents in some area especially in the vicinity of UHV access points. The paper presented the damage of short circuit current increases and common methods to limit fault current. Taking the construction and development of UHV grid in a province of central China as background, the over short circuit currents in 500kV Grid within UHV were showed and several countermeasures including choosing proper UHV access scheme, implementing UHV substation lower voltage bus partition run

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6

Posth, Oliver, Heiko Wunderlich, Michael Flämmich, and Ute Bergner. "Reinigung von Vakuumbauteilen für UHV- und UCV-Anwendungen." Vakuum in Forschung und Praxis 24, no. 6 (2012): 18–25. http://dx.doi.org/10.1002/vipr.201200511.

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7

He, Chang, Ziwei He, and Qiang Xie. "Experimental Evaluations on Seismic Performances of Porcelain and GFRP Composite UHV GIS Bushings." Materials 15, no. 11 (2022): 4035. http://dx.doi.org/10.3390/ma15114035.

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To evaluate the seismic performances of the ultra-high voltage (UHV) gas-insulated switchgear (GIS) bushings made by porcelain and glass fiber reinforced polymer (GFRP) composite materials, shaking table tests were conducted on the two full-scale GIS bushings. The dynamic characteristics and seismic responses of the two UHV GIS bushings were obtained. The experimental results indicated that the two UHV GIS bushings meet the seismic requirements in the corresponding standards. The supporting frame and bus canister amplify the seismic responses of the UHV GIS bushings. Under earthquakes, the GFR

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8

Rao, Yu Fei, and Lin Lin Yu. "UHV AC and DC Coordinated Operation Techniques Based on Continuous Simulation." Applied Mechanics and Materials 713-715 (January 2015): 1347–50. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.1347.

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In the process of China's ultra high-voltage (UHV) construction, Henan UHV power grid is the important part. Summer great load mode of Henan power gird is chosen as the typical method. In the background of completing Nanyang UHV extension project, based on single pole running and double pole running of Hami-Zhengzhou UHVDC project respectively, it is simulated and analyzed. The results indicate that power grid cannot maintain stability when single pole block fault or double pole block fault occurs. Through theoretical analysis and simulation, under UHV AC running certain limit, HVDC latching g

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9

Guo, Jiayi, Jianghai Geng, and Fangcheng Lü. "Influence of voltage fluctuations on core vibration of a UHV shunt reactor." International Journal of Applied Electromagnetics and Mechanics 66, no. 4 (2021): 561–80. http://dx.doi.org/10.3233/jae-201564.

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A new core vibration calculation method of UHV shunt reactors is proposed to deal with the problem that vibration parameters of the core of an ultra-high voltage (UHV) shunt reactor cannot be measured on site. A series of tests have validated that the method can calculate the vibration parameters of a UHV shunt reactor core with different voltage ratios. The method is adopted to study the influence of nodal voltage fluctuations of the UHV AC tie line on the core vibration characteristics of a UHV shunt reactor under normal and abnormal operating conditions. The conclusion is drawn as follows:

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10

Tomita, T., Y. Kokubo, Y. Harada, H. Daimon, and S. Ino. "Development of an Ultrahigh-Vacuum Ultrahigh-Resolution Scanning Electron Microscope." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 1 (1990): 440–41. http://dx.doi.org/10.1017/s0424820100180951.

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An ultrahigh-vacuum (UHV) ultrahigh-resolution (UHR) 100kV scanning electron microscope with a UHV specimen preparation chamber has been developed for in situ observation of clean specimen surfaces. The measured vacuum in the specmen area was about 2.2 × 10-8 Pa, and a 0.14nm lattice image of Au (220) was observed.Field emission scanning electron microscopes have been developed for the past ten years for sub-nanometer analysis. However, in recent analytical electron microscopy of so-called “new materials” such as ceramics and semiconductors, half nanometer analysis in UHV has become extremely

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11

R Gillham, Alex. "How Problematic is an Unpopulated Hell?" Forum Philosophicum 25, no. 1 (2020): 107–21. http://dx.doi.org/10.35765/forphil.2020.2501.7.

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The Problem of Suffering (PoS) claims that there is tension between the existence of a perfect God and suffering. The Problem of Hell (PoH) is a version of PoS claiming that a perfect God would lack morally sufficient reasons to allow individuals to be damned to Hell eternally. A few traditional solutions have been developed to PoH, but each of them is problematic. As such, if there is a solution to PoH that is resilient to these problems, then it deserves our attention. In this paper, I develop such a solution. I call this the Unpopulated Hell View (UHV), which claims that Hell exists as a pl

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12

Kruglov, Ivan A., Alexander G. Kvashnin, Alexander F. Goncharov, et al. "Uranium polyhydrides at moderate pressures: Prediction, synthesis, and expected superconductivity." Science Advances 4, no. 10 (2018): eaat9776. http://dx.doi.org/10.1126/sciadv.aat9776.

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Hydrogen-rich hydrides attract great attention due to recent theoretical (1) and then experimental discovery of record high-temperature superconductivity in H3S [Tc = 203 K at 155 GPa (2)]. Here we search for stable uranium hydrides at pressures up to 500 GPa using ab initio evolutionary crystal structure prediction. Chemistry of the U-H system turned out to be extremely rich, with 14 new compounds, including hydrogen-rich UH5, UH6, U2H13, UH7, UH8, U2H17, and UH9. Their crystal structures are based on either common face-centered cubic or hexagonal close-packed uranium sublattice and unusual H

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13

Wang, Jin, Lu Wang, Yang Xu, Xiao Yu Wang, and Zong Yun Song. "Financial Management Risk Identification and Measurement in UHV Project." Applied Mechanics and Materials 740 (March 2015): 972–76. http://dx.doi.org/10.4028/www.scientific.net/amm.740.972.

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Compared with the general power engineering projects, UHV projects have characteristics of large construction scale, wide radius of management, long management chain and many units involved. Therefore, UHV projects have many financial risks which are different from general power projects. Identifying and measuring risks of financial management in the UHV project is of great significance to avoid important financial risks and improve the efficiency of project financial management. After combing the present situation and characteristics of the UHV project financial management, we use the “three

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14

Yu, Lin Lin, and Yu Fei Rao. "UHV AC Placement Selection Method Based on the Short Circuit Current Coordination." Applied Mechanics and Materials 738-739 (March 2015): 1280–84. http://dx.doi.org/10.4028/www.scientific.net/amm.738-739.1280.

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UHV AC transmission has a high transmission capacity, long distance, low loss, covers save etc. significant advantages, so it’s widely used in our country. But the placement of the UHV which was sent to select still major use projects empirical methods. This method lacks clarity and systematic. Meanwhile, it is difficult to adapt to complex changes in the overall demand for power grid. This paper developed a UHV AC placement selection method based on short-circuit current coordination. According to UHV grid and nearby 500kV grid short-circuit current coordination constraint, unreasonable impac

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15

Su, Yong Chun, and Kai Xuan Chang. "Influence Assessment of UHV Project on Jiangxi Power Grid." Advanced Materials Research 960-961 (June 2014): 1029–33. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.1029.

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In order to face the challenge of our economy and the environment, it is needed to speed up the energy structure transition and UItra High voltage (UHV) transmission has become an inevitable choice. Researches on the influence of UHV project to Jiangxi power grid are carried out in this paper. Using advanced digital power system simulator (ADPSS), the real-time simulation model of Jiangxi power grid is build up including the UHV project. Based on the simulation model, the problem of low frequency oscillation in Jiangxi power system is studied after the UHV power transmission project accessed.

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16

Zhang, Yong Gao, Kai Xuan Chang, and Yong Chun Su. "Shunt Reactors Compensation Research of UHV Accessed to Jiangxi Power Grid." Advanced Materials Research 1070-1072 (December 2014): 1029–34. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1029.

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Jiangxi ultra high voltage (UHV) accessed program is introduced. Based on uniform transfer equation, UHV π-type equivalent circuit is derived by considering the distributed parameter characteristics of UHV transmission line without conductance. Based on advanced digital power system simulator, the relationship of shunt reactor and steady-state voltage, as well as the relationship of shunt reactor and transient voltage, is achieved by using electromechanical and electromagnetic hybrid simulation, where the UHV between Hubei and Jiangxi is considered. Influences of shunt reactors’ location and t

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17

Oversluizen, T., and G. Watson. "UHV piezoelectric translator." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 246, no. 1-3 (1986): 787–89. http://dx.doi.org/10.1016/0168-9002(86)90193-2.

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18

Heppell, T. A. "UHV pumping equipment and the expanding field of UHV activity." Vacuum 41, no. 7-9 (1990): 1931–34. http://dx.doi.org/10.1016/0042-207x(90)94135-d.

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19

Lü, Fang Cheng, Chun Xu Qin, Yun Peng Liu, and Wen Yi Guo. "Study on the Ultra-High Voltage DC Insulators Long-Term Running Research Platform." Advanced Materials Research 718-720 (July 2013): 1782–85. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.1782.

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This paper established the Ultra-High Voltage DC Insulators Long Term Running Research Platform in the National Engineering Laboratory for UHV Engineering Technology (Kunming). The research platform included the following parts: the long-term live examination field for UHV DC equipments, the UHV DC insulators, the leakage current on-line monitoring equipments, the wireless automatic weather station, the infrared monitoring and the ultraviolet monitoring system. The data were real-time processed by the software of the UHV DC insulator information synthetic evaluation system.

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20

Rad, Zahra Jahanshah, Mikko Miettinen, Marko Punkkinen, et al. "Effects of Ultrahigh Vacuum Treatments on Wet Chemically Cleaned Si Surfaces." Solid State Phenomena 346 (August 14, 2023): 57–62. http://dx.doi.org/10.4028/p-zj2yot.

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Ultrahigh vacuum (UHV) environment has been widely used in surface science, but UHV technology has been often considered too complex and expensive methodology for large-scale industrial use. Because the preparation of atomically smooth and clean Si surfaces has become relevant to some industrial processes, we have re-addressed the question if UHV could be utilized in these surface tasks using industrially feasible parameters. In particular, we have studied how UHV treatments might be combined with the widely used semiconductor cleaning methodology of wet chemistry.

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21

An, Li Qiang, Yu Chu Liu, and Bing Zhang. "Dynamic Characteristics Analysis for 1000kV UHV Steel Tubular Tower under Seismic Loading." Applied Mechanics and Materials 494-495 (February 2014): 1815–19. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1815.

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In this paper, the dynamic characteristics of a 1000kV UHV steel tubular tower with double circuit transmission lines on the same tower are analyzed under seismic loading with 8 degrees fortification intensity. Firstly, the finite element model of the tower and simulation of the earthquake are built in ANSYS finite element software. The dynamic characteristics of steel tube tower under Seismic Loads, such as the time-domain curves of displacement, velocity and force of UHV steel tower under Seismic Loads are obtained. The impact of 1000kV UHV transmission tower under nonlinear vibration of sim

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22

R Gillham, Alex. "Threats, Coercion, and Willingness to Damn." Forum Philosophicum 25, no. 2 (2020): 235–54. http://dx.doi.org/10.35765/forphil.2020.2502.16.

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In this paper, I develop and evaluate three new objections to the Un- populated Hell View (UHV). First, I consider whether UHV is false because it presupposes that God makes threats, which a perfect being would not do. Second, I evaluate the argument that UHV is false because it entails that God coerces us and therefore limits our freedom to an objectionable degree. Third, I consider whether UHV is false because it implies that God is willing to damn some individuals to Hell. I conclude that none of these objections defeats UHV. First, even if God’s creation or allowance of Hell constitutes a

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23

Cheng, Yongfeng, Sen Lin, Hongbing You, Zhicheng Lu, and Ersong Chen. "Study on Response Spectrum of Seismic Design of Ultra High Voltage Converter Valves in Bedrock Site." Journal of Physics: Conference Series 2083, no. 2 (2021): 022101. http://dx.doi.org/10.1088/1742-6596/2083/2/022101.

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Abstract It is difficult to evaluate seismic performance of ultra-high voltage (UHV) converter valves reasonably because the response spectrum period used in seismic design of electrical equipment fails to cover the structural period of UHV converter valves at present. Bedrock response spectrum is the basis of seismic design response spectrum. 471 records of long period strong earthquakes in bedrock were analysed. The amplification power spectra and average spectra of all records were calculated. The seismic hazard analysis of 17 typical UHV converter stations was carried out, and the bedrock

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24

Kaspi, Shai. "The Variable High-Velocity Outflows Seen in X-Ray Spectra." Proceedings of the International Astronomical Union 5, S267 (2009): 370–76. http://dx.doi.org/10.1017/s1743921310006733.

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AbstractSeveral AGNs have been reported to have ultra-high velocity (UHV) outflows (of order 0.3 ≳ ν/c ≳ 0.05) that are detected in their X-ray spectrum. Re-visiting these outflow observations reveal that the spectrum has changed along with the claimed outflows. The luminous quasar PDS 456 is the brightest AGN in which a UHV outflow has been claimed to be present in its grating spectrum. We report on an XMM–Newton observation of this source, as well as analysis of past observations, which reveal its variable nature and the variable nature of UHV outflows. In this object, as well as in a few ot

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25

Kerui, Chen, Han Yang, Wang Lei, et al. "Typical Construction Technology and Method of UHV Main Transformer." E3S Web of Conferences 38 (2018): 04003. http://dx.doi.org/10.1051/e3sconf/20183804003.

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According to the latest experience of UHV transformer on-site installation work, according to the rules and regulations requirements, the construction process and process of UHV transformer are summarized, and a typical UHV transformer construction method commonly used at present is obtained. Operation comes down to the arrival of acceptance, annex installation, vacuum oiling and hot oil circulation, sealing inspection, standing five processes. In accordance with the above process steps, this paper is divided into five parts to introduce the process and method of UHV transformer construction i

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26

GAN, Zheyuan, Jiangong ZHANG, Jun ZHAO, and ying Lu. "Analysis of passive interference on radio station from AC UHV power." E3S Web of Conferences 64 (2018): 05002. http://dx.doi.org/10.1051/e3sconf/20186405002.

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The problems of Electromagnetic Interference in Airborne Intelligence Radar Stations near the AC UHV Transmission Lines is researched in this paper, which is mainly passive interference. And then analyzed the passive interference of AC UHV lines. It mainly studied the influence of the tower and line on the distance detection performance of the air-to-air intelligence radar of the UHV transmission lines. and integrated the influence of the surface reflection surface, the shadowing effect and the secondary radiation echo interference, Proposed a passive interference protection distance for UHV t

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27

Chen, Yingcui, Xinru Yu, Wangyuan Xie, and Chao Wu. "Quality Management and Evaluation of UHV Transformer Based on Cloud Matter Element." E3S Web of Conferences 292 (2021): 01022. http://dx.doi.org/10.1051/e3sconf/202129201022.

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As the critical component of power control and transformation in UHV transmission link, the effective management of UHV Transformer's whole life quality cycle is an important guarantee for the safe and stable operation of power grid. In this paper, through the analysis of UHV Transformer quality management mode, on the basis of summarizing the existing management shortcomings, the cloud matter-element model of UHV Transformer quality statistics is constructed. This model realizes the uncertain transformation of qualitative concept and quantitative value through specific algorithm, and uses sho

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28

Wang, Yunlong, Lidong Yan, Yongning Wang, and Guochao Yang. "The Research of real-time identification system of types of lightning failures of UHV transmission lines based on UV detection technique." E3S Web of Conferences 185 (2020): 01048. http://dx.doi.org/10.1051/e3sconf/202018501048.

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Egineering running experience shows that with the increase of the operating voltage of the transmission line, the lightning trip rate is increasing. According to theoretical calculation ， UHV transmission lines should be provided with full lightning protection characteristics；however，running experience shows that the lightning withstand level of UHV transmission lines is high，not completely lightning protection; it puts forward higher requirements for lightning protection design of UHV transmission line in China. UHV transmission line is mainly against direct lightning stroke characteristics，

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29

Bharti, Satyadharma, and Satya P. Dubey. "Controlled Shunt Reactor for UHVAC System Reactive Power Control." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, no. 3 (2020): 417–25. http://dx.doi.org/10.2174/2352096512666190130095341.

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Background: In this paper, a novel technique for reactive power management of the Ultra High Voltage (UHV) lines having voltage level of 1200 kV line and above is suggested. The UHV power grid has to frequently face the problems associated with the power- frequency and switching over-voltages. Methods: The technique involves the use of three-phase UHV Transformers as a Controlled Shunt Reactor (CSR) in combination with the use of a fixed reactor. The performance of the UHV AC transmission line is studied using PSCAD software and working of CSR is evaluated. Results: Standard parameters of the

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30

Ye, Qi Ming, Liang Xie, Xiao Qing Luo, and Feng Huo. "Test Research on Phase-to-Ground Air-Gap Discharge Characteristics of UHV Substation." Applied Mechanics and Materials 492 (January 2014): 162–68. http://dx.doi.org/10.4028/www.scientific.net/amm.492.162.

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In order to optimize the design of UHV substation and reduce its construction investment, it is necessary to take further research of UHV substation air-gap discharge characteristics. In this paper, by using sub-conductor and tower to simulate UHV substation air-gap, lightning and switching impulse discharge characteristics tests of UHV substation are taken in the UHV AC test base of SGCC. The results show that, when the distance of conductor between tower is in range of 4m to 7m, the 50% lightning impulse and switching impulse discharge voltage rise along with the rise of air gap distance. As

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31

Lv, Wei, and Lihong Zhang. "The Seismic Response of Ultra-High Voltage Gas-Insulated Transmission Lines." Journal of Physics: Conference Series 2557, no. 1 (2023): 012065. http://dx.doi.org/10.1088/1742-6596/2557/1/012065.

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Abstract As an important part of the substation, the seismic capacity of ultra-high voltage (UHV) electrical equipment is related to the safe and stable operation of the substation and the whole power grid. The UHV gas-insulated transmission lines (GIL) have many structural characteristics, such as long pipeline distance, the large span between supports and the obvious amplification effect of supports. Its natural frequency is close to the predominant frequency of the seismic wave, resulting in its susceptibility to resonance or resonance-like and high seismic susceptibility. In order to analy

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32

Song, Dan, Ya Xu Cao, and Zhi Rui Liang. "Leading the Smart Grid Revolution with UHV." Advanced Materials Research 614-615 (December 2012): 1862–65. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.1862.

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With the rapid development of the grid, smart grid has become an undoubted trend. World's major power companies are searching for local smart grid technologies in transmission intelligence, substation intelligence and distribution intelligence and other areas. And China is leading our own smart grid revolution with world-class UHV power technologies, both in AC and DC. Chinese UHV have suffered countless hardships on our road. The development of UHV and smart grid technologies in China and their position in the world prove that the UHV technologies line with China's national conditions. It is

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33

Duan, Ding Qiang, and Li Ting Jiao. "Analysis of UHV Power Grid Operation and Maintenance System Construction and Optimization Strategy - Taking Shan-Xi UHV Grid as an Example." Advanced Materials Research 960-961 (June 2014): 1108–11. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.1108.

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Compared with the traditional power grid, UHV power grid has the character of stronger system function, higher control requirement, and also set a higher request to the daily maintenance management. The operation and maintenance experience of Shan-xi province electric power company on the UHV power grid proved the importance of establishing the new mode of management, strengthening the application of automation technology, and guarenteeing the technology and resources . In order to improve the efficience and quality of UHV power grid operation and maintenance, we should speed up the formulatio

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Gong, Jie, Lixing Zhou, Lawu Zhou, and Mengdi Zhou. "Non-characteristic Harmonic Analysis of Uhv ac/dc Systems." MATEC Web of Conferences 260 (2019): 02011. http://dx.doi.org/10.1051/matecconf/201926002011.

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Uhv direct current transmission has developed rapidly in China due to its unique advantages of large capacity, long distance and high voltage. A series of researches have been carried out on the non-characteristic harmonic current in the grid side of uhv dc transmission system. This paper is aimed at the analysis of non-characteristic harmonics in the uhv direct current transmission system using a 12-pulse converter. Under ideal operating conditions, the system has characteristic non-characteristic harmonics. However, the actual operation condition of HVDC project is not ideal, so there are no

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35

Takeguchi, M., T. Honda, Y. Ishida, M. Kersker, M. Tanaka, and K. Furuya. "Ultrahigh-Vacuum Field-Emission Electron Microscope as Applied to Observation and Analysis of Crystal Surface." Microscopy and Microanalysis 3, S2 (1997): 597–98. http://dx.doi.org/10.1017/s1431927600009879.

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UHV(ultrahigh-vacuum) TEM has long been used as a powerful tool for studying crystal surfaces, particularly for both the direct imaging of the surface structure and for in-situ observation of surface reaction processes with atomic resolution.This paper reports a newly developed 200kV UHV TEM equipped with a field emission gun(FEG). The instrument is designed to obtain information about elemental or bonding states of surfaces in addition to observation of surface atomic structure with high contrast. Basic performances of the UHV FE-TEM includes a specimen vacuum of 2.0X10-8Pa, probe size less t

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Liu, Ji Wu, Yan Hong Xiong, and Yang Ji. "The Research of the Status Quo and Development of UHV Transmission Lines Construction in China." Advanced Materials Research 516-517 (May 2012): 1555–59. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1555.

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The construction of UHV (ultra-high voltage) transmission lines has become an important part of the planning of “smart grid" and “solid grid” in China. This article elaborated in recent years the UHV transmission lines construction status and possible problems, has made a comparative analysis on the angle of environmental carrying capacity, and put forward three effective suggestions, in order to improve the construction efficiency of UHV transmission lines engineering.

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Liu, Meng, Wei Yong Jiang, Yi Wei Zhang, and Yong Min. "Available Transmission Capacity Analysis for the Receiving-End Grid of UHV-DC Transmission System." Applied Mechanics and Materials 740 (March 2015): 390–96. http://dx.doi.org/10.4028/www.scientific.net/amm.740.390.

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UHV-DC transmission system presents certain adverse reactive characteristics to its receiving-end grid. Based on the approach of P-V curve and V-Q curve, this paper presents a method of voltage stability analysis for the receiving-end grid of UHV-DC transmission system, which gives its available transmission capacity (ATC), voltage limit and reactive power margin, with the consideration of the normal, N-1 and N-2 operation situations and the situation of the commutation failure. Different with traditional ATC analysis, the characteristics of UHV-DC transmission system is included here. With th

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38

Ma, Guo-Liang, Qiang Xie, and Andrew Whittaker. "Seismic Performance Assessment of an Ultra-High–Voltage Power Transformer." Earthquake Spectra 35, no. 1 (2019): 423–45. http://dx.doi.org/10.1193/111217eqs234m.

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Ultra-high–voltage (UHV) power distribution systems are seeing increased use in the seismically active regions of developing world, including China, as backbone power grids are being built out over long distances. This paper presents a study of the seismic performance of a UHV power transformer. Construction details for a typical Chinese UHV power transformer are described. The seismic behavior of the UHV power transformer is evaluated numerically, including calculation of modal properties and response to design basis earthquake shaking. The amplification of ground motion to the points of atta

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ZHANG, Jiangong, Zheyuan GAN, Jun ZHAO, and ying Lu. "Analysis of active interference on radio station from AC UHV power." E3S Web of Conferences 64 (2018): 05003. http://dx.doi.org/10.1051/e3sconf/20186405003.

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The problems of Electromagnetic Interference in Airborne Intelligence Radar Stations near the AC UHV Transmission Lines are researched in this paper, which is mainly active interference. The calculation method for the interferences is analysed, and then the proper protection distances of the AC UHV transmission line to the radar station are given. The paper analyzed the active interference of AC UHV transmission lines, and focuses on the active interference caused by the line corona on the active radar of nearby airborne intelligence when the transmission line is under normal operation. In the

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Zhang, Shuqi, Xinru Yu, Chao Wu, Pengfei Jia, Junyu Deng, and Huanchao Cheng. "Manufacturing process optimization and quality grading method of insulating paperboard for converter transformer." Journal of Physics: Conference Series 2254, no. 1 (2022): 012031. http://dx.doi.org/10.1088/1742-6596/2254/1/012031.

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Abstract Oil paper insulation is the main form of transformer internal insulation. Different from the conventional transformer, the insulating paperboard bears a higher electric field component in the interior of the converter transformer. Therefore, the performance of insulating paperboard plays a vital role in the reliability of converter operation. Many insulation faults have occurred in the operation of UHV converter transformer. The production process and detection standard of conventional transformer insulating paperboard can not meet the operation requirements of UHV converter transform

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Zhang, Shuqi, Xinru Yu, Chao Wu, Pengfei Jia, Junyu Deng, and Huanchao Cheng. "Manufacturing process optimization and quality grading method of insulating paperboard for converter transformer." Journal of Physics: Conference Series 2254, no. 1 (2022): 012031. http://dx.doi.org/10.1088/1742-6596/2254/1/012031.

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Abstract Oil paper insulation is the main form of transformer internal insulation. Different from the conventional transformer, the insulating paperboard bears a higher electric field component in the interior of the converter transformer. Therefore, the performance of insulating paperboard plays a vital role in the reliability of converter operation. Many insulation faults have occurred in the operation of UHV converter transformer. The production process and detection standard of conventional transformer insulating paperboard can not meet the operation requirements of UHV converter transform

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Chen, Fuan, Hui Zeng Tang, and Hong Gang Li. "Application of On-Line Ultrasonic and UHF Partial Discharge Detection in 1000kV GIS." Applied Mechanics and Materials 644-650 (September 2014): 3480–84. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.3480.

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This paper introduces the detecting principle、range of application and interferencerejection of Ultrasonic And UHF Partial Discharge Detection In GIS(Gas Insulated Switchgear).In view of the advantages and disadvantages of ultrasonic and UHF detection,this paper proposesa quick joint detection method, which uses UHF (Ultra High Frequency) method to online detectthe suspected discharge range in real time, adopts ultrasonic method to determine the specificdischarge points, finally through a concrete instance in a 1000KV UHV(Ultra High Voltage)Substation verified the feasibility of the joint dete

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Takata, Shintaro, Yoshihiro Miura, and Yuji Matsumoto. "Evidence for the intrinsic nature of band-gap states electrochemically observed on atomically flat TiO2(110) surfaces." Phys. Chem. Chem. Phys. 16, no. 45 (2014): 24784–89. http://dx.doi.org/10.1039/c4cp03280b.

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Guo, Zhen, Hui Yuan Zhang, Bo Wang, Ren Min Gong, and Yong Hao Zhang. "Research on the Influence of Closing Resistor inside Circuit Breaker on Magnetizing Inrush Current of UHV Transformer." Advanced Materials Research 986-987 (July 2014): 2001–5. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.2001.

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Using Matlab/Simulink software established the simulation model of UHV transformer and UHV power grid.The characteristic of magnetizing inrush current for UHV transformer was obtained by simulation.The paper also analyzed the impact on differential protection from it. Closing resistor inside circuit breaker method was proposed to restrain magnetizing inrush current.The method cuts down the amplitude and accelerated the attenuation speed of it, so as to restrain it. The simulation analysis verified the effectiveness of the method.

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Zhang, Xuesong, Meigen Cao, and Zhicheng Lu. "Seismic Reliability of UHV Porcelain arrester with Damping System." Open Electrical & Electronic Engineering Journal 8, no. 1 (2014): 222–28. http://dx.doi.org/10.2174/1874129001408010222.

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The vulnerability of the UHV porcelain arrester is very high under strong earthquake. To rise seismic reliability of the UHV porcelain arrester, a new type lead damper, which is a new patent product, is installed at the bottom of the equipment. To investigate the damping effect of the dampers, the experimental research and finite element analysis on seismic behavior of the UHV porcelain arrester with and without the dampers are carried out by means of single point input and single point output(SISO)measurement. The analyzed results show that the damper is well functioning, effectively decreasi

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Xu, Li, Hao Guo, Yanyi Fu, et al. "Research of 3D trajectory Hovering Points Determination Method of UAV Patrol Inspection Transmission Tower." Journal of Physics: Conference Series 2378, no. 1 (2022): 012088. http://dx.doi.org/10.1088/1742-6596/2378/1/012088.

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Abstract It is necessary to set UAV hovering points before programming the trajectory of a UAV patrol inspection transmission tower body and accessories such as fittings and insulators. The choice of the hover point will affect the work safety and inspection efficiency of the UAV. Therefore, a 500kV UHV AC double-drum tower and UAV three-dimensional simulation model are established and Electromagnetic field is emulated at first. Finally, UAV hovering points are determined by considering the simulation results and functional parameters of UAV. The research method is of great significance for th

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Marks, L. D., R. Ai, J. E. Bonevich, et al. "UHV microscopy of surfaces." Ultramicroscopy 37, no. 1-4 (1991): 90–102. http://dx.doi.org/10.1016/0304-3991(91)90009-u.

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Ai, R., M. I. Buckett, D. Dunn, T. S. Savage, J. P. Zhang, and L. D. Marks. "UHV microscopy of surfaces." Ultramicroscopy 39, no. 1-4 (1991): 387–94. http://dx.doi.org/10.1016/0304-3991(91)90219-v.

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Zhou, Jing, Ke Wang, Ya Ping Li, and Dan Zeng. "Exploration of AGC Control Mode for North China-Central China-East China UHV Synchronous Power Grid." Applied Mechanics and Materials 433-435 (October 2013): 1230–36. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.1230.

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With the continuous construction of ultra high voltage (UHV) power grid, East China-Central China North China will be interconnected via UHV lines to be a UHV synchronous grid in the future. Further expansion of the grid scale, the existing active power and frequency control mode has been unable to adapt to the new features. Based on the future structure of North China-Central China-East China synchronized power grid, the article built the whole network of the AGC control model using PSD-FDS full dynamic simulation program. By the simulation of examples, the problems of AGC control mode for UH

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Buckett, M. I., S. R. Singh, H. Fan, T. Wagner, and L. D. Marks. "Electron-stimulated damage processes in oxides under ultra-high vacuum (UHV) conditions." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 636–37. http://dx.doi.org/10.1017/s0424820100155153.

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HREM has recently entered the surface science arena as a complementary technique for studies of electron-stimulated damage of oxide surfaces. The primary advantage offered is the ability to observe in-situ structural changes of the surface, as has been exemplified in the literature for NiO, WO3, V2O5, and TiO2, among other oxide crystals. One major drawback has been the inability to perform experiments under UHV conditions comparable to those used in conventional surface science techniques. Previous HREM reports have not considered the effect of the microscope environment in surface radiation

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