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Journal articles on the topic 'Real in-line transmission'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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1

Akoh, H., S. Sakai, A. Yagi, and H. Hayakawa. "Real time fluxon dynamics in josephson transmission line." IEEE Transactions on Magnetics 21, no. 2 (March 1985): 737–40. http://dx.doi.org/10.1109/tmag.1985.1063760.

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2

Benkrid, A., A. Benallal, and K. Benkrid. "Real-Time Vocal Tract Modelling." Modelling and Simulation in Engineering 2007 (2007): 1–8. http://dx.doi.org/10.1155/2007/28456.

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To date, most speech synthesis techniques have relied upon the representation of the vocal tract by some form of filter, a typical example being linear predictive coding (LPC). This paper describes the development of a physiologically realistic model of the vocal tract using the well-established technique of transmission line modelling (TLM). This technique is based on the principle of wave scattering at transmission line segment boundaries and may be used in one, two, or three dimensions. This work uses this technique to model the vocal tract using a one-dimensional transmission line. A six-port scattering node is applied in the region separating the pharyngeal, oral, and the nasal parts of the vocal tract.
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3

Estin, A. J. "Data handling capacity of a real transmission line in a noiseless system." IEEE Transactions on Instrumentation and Measurement 39, no. 1 (1990): 140–45. http://dx.doi.org/10.1109/19.50433.

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4

Ward, A. G., N. R. Watson, C. P. Arnold, A. J. Turner, and B. J. Ring. "Inversion of real time spot prices in the direction of real power flow in a transmission line." IEEE Transactions on Power Systems 15, no. 4 (2000): 1197–203. http://dx.doi.org/10.1109/59.898090.

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5

Chen, Lei, Zai Chao Huang, Peng Wu, and Chuan Liu. "Transmission Line Condition Monitoring Based on Internet of Things in Smart Grid." Applied Mechanics and Materials 336-338 (July 2013): 2488–93. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.2488.

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In order to meet the demand for real-time monitoring of transmission line state in the construction of the smart grid, this paper adopt the transmission line condition monitoring system that is based on the Internet of Things technology, PON technology and the fuzzy expert diagnostic technology; with a large number of experiments and field pilots, we get ideal results. It can get real-time the state of the transmission line and make accurate judgments, which verify the accuracy and implementability of the system; This system has many advantages, such as comprehensive collection of information, stable network, high output accuracy, simple to deploy, and so on.
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Yang, Xiao Hui, Dong Yan, Yu Sheng Zheng, and Xiao Kuo Kou. "The Construction and Development of Comprehensive Test Centre Based on Real Transmission Line." Applied Mechanics and Materials 330 (June 2013): 163–71. http://dx.doi.org/10.4028/www.scientific.net/amm.330.163.

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Galloping of overhead transmission line is a low-frequency, large amplitude, wind-induced vibrations of both single and bundle of overhead transmission lines, which have been one of the largest threaten for the security and stability of power grid operation. On account of the uncertainty and probability of galloping events happening, most of the study on transmission line galloping had still stayed on simulation or model test, only less of the study were in accordance with the accident records on-site. Several ten years study on conductor galloping had been proved that the laboratory built on real transmission line was the essential foundation and the effective condition for the systemic study on galloping. Comprehensive Test Centre based on Real Transmission Line (CTC for short) is the first laboratory focus on the study of conductor galloping and ice-accretion. whose content of tower type,conductor arrangement and transmission line length, currently have been the most abundant in worldwide. The establishment of the Comprehensive test centre have been very important on promoting the fundamental and systemic study in the relative field. Since the frequent conductor galloping under the condition of natural climate achieved successfully, CTC have developed several essential and valuable scientific projects. In this paper, CTC would be introduced from the aspects of basic facilities configuration, mainly function design and implementation, focal capabilities and some study outcomes at moment.
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Liu, Bing Qi, Hui Lan Jiang, and Jing Peng Wang. "Client-Side in Management System of Transmission Line Passage Protection Based on Android." Advanced Materials Research 986-987 (July 2014): 2139–42. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.2139.

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To overcome the shortcoming of lack of real-time in traditional latent troubles information management, a transmission line passage protection system (TLPPS) Android client-side is developed in this paper. Basing on Android mobile’s real-time communication and good development performance, Android client is used to record the information of latent trouble. Web Service is adopted to realize the wireless communication between client and server, then the real-time upload and updating is realized, thus improving the accuracy and making it possible for the administrator to put up with the advice of dealing with the latent trouble in time. The security of power system is guaranteed.
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8

Tong, Bu Sheng, Yu Xiang Lv, Bei Ge Yang, Hui Xue, and Shan Zhi. "Design and Application of Aeolian Vibration Monitoring System for Overhead Transmission Line." Applied Mechanics and Materials 239-240 (December 2012): 456–61. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.456.

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Aim at the shortage of traditional Aeolian vibration fatigue tests and theoretical models for transmission line, the Aeolian vibration monitoring system of transmission line based on the ZigBee wireless network was designed. The system transfer real-time field data of meteorological factors, tension of conductor and acceleration of monitoring nodes to background computer. The line vibration curve integrated directly from the acceleration sensor recorded data will present a serious problem of baseline drift. Therefore, based on least-square theory, a new baseline correction method is proposed to eliminate effect on drifts, and then obtain distortion less vibration curve of transmission line by twice integrations. The system running results show that track fitted with monitoring data is in good agreement with the real recorded trajectory. The system can satisfy the needs of the real time monitoring on transmission line site and be well applied to the calculation of conductor fatigue damage.
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9

Wang, De Quan, Ke Xin Wang, Jin Hua Ding, Teng Gao, and Tian Ji. "Research and Development of Mes System for Gearbox Production Line." Applied Mechanics and Materials 385-386 (August 2013): 1827–30. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1827.

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According to the characteristics of manufacturing execution system and transmission manufacturing industry (MES) demand, the MES software architecture based on OPC Technology, establishment of real-time visualization of the gearbox assembly process based on workflow, real-time production process tracking, real-time and interactive technology of PLC framework. The system can meet the requirements of mixed production line, guiding device, realize the flexible production. The development of MES system has been applied in a transmission line and stable operation.
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10

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， one is caused by lightning counterattack trip，the other is the shielding failure of lightning around the line to strike the wound caused by the wire. The lightning fault type identification is based on the micro topography of UHV transmission tower，accumulation of historical data，the development of a more targeted and high voltage transmission line lightning protection scheme is of great significance. In this paper, a real-time identification system based on UV detection technology, which has high accuracy and fast response time, is proposed for lightning fault types of UHV transmission lines, the systems use ultraviolet light to realize online detection of high-voltage transmission line tower nearby lightning, can effective observation tower near lightning discharge, and it has the characteristics of continuous detection, longdistance, no power supply, no contact and no disassembly, it provides an advanced technology for the detection of lightning discharge in UHV transmission line.
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11

Zhang, Qi, Lu Dai, and Xiong Chen. "Acid Emission Automatic Real-Time Sampling Monitoring System." Applied Mechanics and Materials 602-605 (August 2014): 1646–49. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.1646.

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This paper introduces a novel on-line real-time monitoring system for acidic emission produced by acid pickling, which has been one of the greatest contaminant and major harness content. The system can monitor the HCL concentration in exhaust fumes on-line, and realize the real-time analysis and transmission of the acquisition data. HCL wet chemical sampling system form the whole on-line monitoring system. HCL wet chemical sampling system consists of integrated air velocity transducer, chloride ion analyzer, wet chemical sampling device and liquid level measurement device. It aims to collect HCL fog sample and convert the sampling analogue signal to digital data that can be analyzed. The system overcomes the influence by high temperature, high humidity and high concentration of dust. It realizes the monitoring, storage, analysis, warning and transmission of HCL concentration data in the exhaust. It is beneficial in practical industrial field and environmental protection.
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12

Huawei, Zhan, Liu Weina, Li Qiaoyu, Yan Tingting, and Zheng Jie. "Property Analysis and Experimental Study of the Broadband Transmission-Line Transformer in Multimode Feed Network." Open Electrical & Electronic Engineering Journal 9, no. 1 (May 29, 2015): 153–59. http://dx.doi.org/10.2174/1874129001509010153.

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Transmission-line transformers are circuits useful for microwave impedance matching applications due to their broad operating bandwidth. Multimode feed network is composed of two substructures, which are constituted by the transmission-line transformer. Beginning with the broadband transmission-line transformer with 4:1 impedance transformation, supposing the currents on the two lines are not equal but opposite and with the application of two line transmission- line theory, the current-voltage relationships of the asymmetrical (current) bifilar even transmission-line are obtained. An equivalent model with mutual coupling between the subject transmission-lines has been proposed, and its characteristics for impedance transformation have been analyzed. Also, a useful and effective analytic method for bifilar transmission- line transformer has been proposed. The calculated values are in good agreement with the metrical values. So in real application it can better improve the performance of the component and can be used more efficiently.
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13

Srivastava, Manish, Prakhar Singh, Sandeep Verma, and Prince Singh. "Power Flow Control in Transmission Line by Using UPFC." International Journal of Research in Engineering, Science and Management 4, no. 4 (April 28, 2021): 126–29. http://dx.doi.org/10.47607/ijresm.2021.670.

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The power transfer capacity of electrical transmission lines is typically constrained by the capacity of large signals. Economic considerations such as the high cost of long lines and the income from the supply of additional power make it possible to pursue both economically and technically viable ways to increase the stability cap intensively. On the other hand, the production of efficient ways to use the full thermal capacity of transmission systems. The power industry has already begun to be affected by fast development in the field of power electronics. This is one direct consequence of the idea of aspects of FACTS, which has become possible due to the progress realized in power electronic devices. In theory, the FACTS devices can provide rapid control of real and Var power through transmission line. The UPFC is a FACTS family member with very appealing characteristics. Many parameters can be independently controlled by this unit. An alternative means of minimizing transmission system oscillations is given by this unit. The choice of input signals and the adopted control strategy for this system in order to dampen power oscillations in an efficient and robust manner are an important issue. In order to achieve the maximum desire effect in solving the first swing stability problem, the UPFC parameters can be regulated. In bulky power transmission systems with long transmission lines, this problem arises. A MATLAB Simulink Model with UPFC to test the efficiency of the electrical transmission system is considered in this paper. The main purpose of this analysis paper is to research different studies performed in the past to minimize UPFC transmission line losses.
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14

G.Umale, V., Dr S.B.Warkad, S. Wadhankar, and H. S.Sakhare. "Optimal Pricing of Electricity in Restructured Electricity Market." International Journal of Engineering & Technology 7, no. 4.5 (September 22, 2018): 389. http://dx.doi.org/10.14419/ijet.v7i4.5.20189.

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An effective pricing scheme that to provide the useful information to generation, transmission section and customers. These transmission pricing depends on generator, load levels and transmission line constraints. Transmission line constraints result is variations in energy prices throughout the network. The proposed approach is based on AC-DC optimal power flow model with considering of losses. Resulting optimization problem is solved by linear programming approach. Locational Marginal Pricing methodology is used to determine the energy price for transacted power and to manage the network congestion and marginal losses. Variation of LMP values with transmission constraint conditions also studied. Simulation is carried out on IEEE 57 bus system, 400/765kV MSETCL system of Maharashtra transmission line for real data bus system and the results are presented.
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15

Ma, Yunpeng, Qingwu Li, Lulu Chu, Yaqin Zhou, and Chang Xu. "Real-Time Detection and Spatial Localization of Insulators for UAV Inspection Based on Binocular Stereo Vision." Remote Sensing 13, no. 2 (January 11, 2021): 230. http://dx.doi.org/10.3390/rs13020230.

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Unmanned aerial vehicles (UAVs) have become important tools for power transmission line inspection. Cameras installed on the platforms can efficiently obtain aerial images containing information about power equipment. However, most of the existing inspection systems cannot perform automatic real-time detection of transmission line components. In this paper, an automatic transmission line inspection system incorporating UAV remote sensing with binocular visual perception technology is developed to accurately detect and locate power equipment in real time. The system consists of a UAV module, embedded industrial computer, binocular visual perception module, and control and observation module. Insulators, which are key components in power transmission lines as well as fault-prone components, are selected as the detection targets. Insulator detection and spatial localization in aerial images with cluttered backgrounds are interesting but challenging tasks for an automatic transmission line inspection system. A two-stage strategy is proposed to achieve precise identification of insulators. First, candidate insulator regions are obtained based on RGB-D saliency detection. Then, the skeleton structure of candidate insulator regions is extracted. We implement a structure search to realize the final accurate detection of insulators. On the basis of insulator detection results, we further propose a real-time object spatial localization method that combines binocular stereo vision and a global positioning system (GPS). The longitude, latitude, and height of insulators are obtained through coordinate conversion based on the UAV’s real-time flight data and equipment parameters. Experiment results in the actual inspection environment (220 kV power transmission line) show that the presented system meets the requirement of robustness and accuracy of insulator detection and spatial localization in practical engineering.
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Ma, Yunpeng, Qingwu Li, Lulu Chu, Yaqin Zhou, and Chang Xu. "Real-Time Detection and Spatial Localization of Insulators for UAV Inspection Based on Binocular Stereo Vision." Remote Sensing 13, no. 2 (January 11, 2021): 230. http://dx.doi.org/10.3390/rs13020230.

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Unmanned aerial vehicles (UAVs) have become important tools for power transmission line inspection. Cameras installed on the platforms can efficiently obtain aerial images containing information about power equipment. However, most of the existing inspection systems cannot perform automatic real-time detection of transmission line components. In this paper, an automatic transmission line inspection system incorporating UAV remote sensing with binocular visual perception technology is developed to accurately detect and locate power equipment in real time. The system consists of a UAV module, embedded industrial computer, binocular visual perception module, and control and observation module. Insulators, which are key components in power transmission lines as well as fault-prone components, are selected as the detection targets. Insulator detection and spatial localization in aerial images with cluttered backgrounds are interesting but challenging tasks for an automatic transmission line inspection system. A two-stage strategy is proposed to achieve precise identification of insulators. First, candidate insulator regions are obtained based on RGB-D saliency detection. Then, the skeleton structure of candidate insulator regions is extracted. We implement a structure search to realize the final accurate detection of insulators. On the basis of insulator detection results, we further propose a real-time object spatial localization method that combines binocular stereo vision and a global positioning system (GPS). The longitude, latitude, and height of insulators are obtained through coordinate conversion based on the UAV’s real-time flight data and equipment parameters. Experiment results in the actual inspection environment (220 kV power transmission line) show that the presented system meets the requirement of robustness and accuracy of insulator detection and spatial localization in practical engineering.
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17

Yang, Bo, Kui Hua Wu, Yi Qun Wang, and Shen Quan Yang. "Analysis on Capacity of Transmission Line Based on Thermal Rating." Advanced Materials Research 986-987 (July 2014): 239–42. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.239.

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The rapid growth of power grid load put forward higher requirements on the transmission capacity of line, with the growing tension of line corridors, building new transmission lines is becoming more and more difficult. Therefore, it is of realistic significance to analyze the transmission capacity of existing transmission line and fully tap the existing power grid transmission capacity. On the basis of previous studies, and consulting a large number of references, this paper summarizes and expounds the methods of improving transmission capacity by using the thermal rating analysis, introducing static thermal rating and real-time static thermal rating. Also, this paper verifies applications of the above methods in actual running environment.
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18

Xie, Wen Ping, Bo Chen, Peng Yun Li, and Xiao Fen Gong. "Research on Dynamic Responses of a Transmission Tower under Monsoon Wind." Applied Mechanics and Materials 744-746 (March 2015): 248–52. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.248.

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The research on dynamic responses of a transmission tower under monsoon wind is actively carried out in this study. A real transmission tower-line system constructed in the southern coastal areas of China is taken as an example to investigate the structural performance subjected to monsoon wind. The finite element model of the transmission tower-line system is established with the aiding of commercial package. The equation of motion of the transmission tower-line system under monsoon wind is established. The dynamic wind loading are applied on the tower-line system to examine the structural responses.
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M Hilterbrand, Charles. "The Potential Impact Radius of a Natural Gas Transmission Line and Real Estate Valuations: A Behavioral Analysis." Muma Business Review 4 (2020): 087–89. http://dx.doi.org/10.28945/4514.

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This study intended to address the question, “How would a purchase price be impacted if a seller provided buyers a notice that the residential property that has been listed for sale is located within a Potential Impact Radius (PIR) of a natural gas transmission line?” Does the notice of the location affect the purchase value a buyer is willing to offer for a residential property? Does the perceived risk associated with PIR affect the amount a potential buyer would offer? To address these questions, a Qualtrics survey that included three video tour treatments of a residential property was sent to three groups. A control group was presented a video tour without any residential disclosure notice. A second group was presented a video tour with an audible notice that the residence is located within 500 feet of a natural gas transmission line. A third group was presented a video tour with an audible notice that the residence is located within the potential impact radius (PIR) of a natural gas transmission line. Each respondent was asked to state a fair offer value for the residential property shown in their respective video. No statistically significant difference was found in the fair offer value mean between the control group and the group with notice the residence is located within 500 feet of a natural gas transmission line was found. No statistically significant difference was found in the fair market value between the group with notice the residence is located within 500 feet of a natural gas transmission line and the group with notice the residence is located within the potential impact radius (PIR) of a natural gas transmission line was found. A statistical significance was found where the control group was compared to the group with notice the residence is located within the potential impact radius (PIR).
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20

Wang, Chun Jie, and Bo Xiang Xin. "Abnormal Image Monitoring for Transmission Line Based on Digital Image Processing." Advanced Materials Research 710 (June 2013): 613–16. http://dx.doi.org/10.4028/www.scientific.net/amr.710.613.

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In the high-voltage transmission line system, the accidents have often occurred, and as a result of power line icing accidents are particularly prominent. In this paper, the author presents a DSP-based image monitoring of high voltage transmission line method. This method is use of high-voltage transmission tower-lines camera to collect the high voltage transmission line image in real time, and directly processing the image in DSP. If wires normal, it will not send pictures to the center and if the abnormal occurred, it will calculate the thickness of ice covering wires, converting the image to JPEG. This article designed and implemented the DSP-based image monitoring of high voltage transmission line algorithm exception, run successfully in the simulation and emulation system which can be used for monitoring of high voltage transmission line icing conditions online.
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21

Guanyao, Wang, and Wang Xu. "Abnormality detection method for transmission lines based on video code stream analysis." E3S Web of Conferences 245 (2021): 01028. http://dx.doi.org/10.1051/e3sconf/202124501028.

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As the demand for electricity continues to grow, the coverage of transmission lines is getting larger. Despite the continuous improvement of the grid system, transmission lines are still vulnerable to various natural disasters. At the same time, many transmission lines are installed in areas with harsh environments and other places that are difficult for operation and maintenance personnel to reach, which brings huge challenges to the operation and maintenance of transmission lines. Therefore, how to effectively detect the status of the transmission line and ensure the normal operation of the power grid has become an important research topic in the power system. The existing video surveillance-based methods need to decode the video, which has poor real-time performance. Therefore, this paper proposes a transmission line abnormality monitoring method based on video stream analysis. Using the extracted parameters for judgment before decoding the video stream can effectively improve the real-time performance of online monitoring of the transmission line and greatly shorten the time required for abnormal alarms.
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22

Yasuda, Yuji, Akihiko Yokoyama, and Yasuyuki Tada. "A Study on Modeling of Transmission Line in Digital Type Real-Time Power System Simulator." IEEJ Transactions on Power and Energy 124, no. 3 (2004): 422–30. http://dx.doi.org/10.1541/ieejpes.124.422.

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23

Amari, S., and U. Rosenberg. "Synthesis and Design of Novel In-Line Filters With One or Two Real Transmission Zeros." IEEE Transactions on Microwave Theory and Techniques 52, no. 5 (May 2004): 1464–78. http://dx.doi.org/10.1109/tmtt.2004.827023.

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24

Wei, Meifang, Jing Yang, Xuhua Zeng, Haiyan Wu, and Di Huang. "Research on the Device Design for Calculation Distribution Line Loss Based on Dynamic Three-phase Unbalance Degree." E3S Web of Conferences 118 (2019): 02071. http://dx.doi.org/10.1051/e3sconf/201911802071.

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For the power distribution network line loss calculation, there are some problems, such as backward method, long calculation period, large workload and poor real-time performance. To this end, this paper proposes a real-time calculation method for distribution line loss based on dynamic three-phase unbalance, and a hardware device system with unbalanced phase sequence identification function, three-phase unbalance detection function and line loss real-time calculation function has been developed. The system uses a master-slave design based on the principle of wireless transmission. The slave collects standard three-phase current signals and transmits them to the host through wireless transmission. The host is installed on the low voltage side of the transformer in the transformer region, and the current signal of the transformer region is collected in real time. Unbalanced phase sequence identification, unbalance calculation, and line loss calculation based on dynamic unbalance are performed by comparing the current signals collected by the master and the slave. The above algorithm implementation process can be displayed online in real time. In addition to the core data processing and waveform display functions, the device also includes a battery power supply and management system, a signal storage and transmission system, and temperature measurement, and overcurrent and overvoltage protection. The test results of the device show that the device has the characteristics of convenient carrying, fast detection of three-phase unbalance, and accurate calculation of line loss. The device can monitor the running status of the distribution network transformer region in real time.
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Li, Bo, Bo Chen, and Chun Xia. "Dynamic Energy of a Large Scale Transmission Tower Subjected to Wind Excitations." Advanced Materials Research 383-390 (November 2011): 3645–51. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3645.

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Evaluation on energy characteristics of a wind-excited transmission tower-line system is actively carried out in this study. The analytical method of a transmission tower-line system is established. The evaluation criteria of energy responses is developed and applied to the wind response analysis of a transmission tower. A real transmission tower-line system constructed in China is taken as an example to examine the feasibility and reliability of the proposed approach. The observations from numerical investigation indicate that the proposed energy evaluation criteria can be effectively utilized in the examination on structural dynamic performance.
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Karelin, Sergey Y., Vitaly B. Krasovitsky, Igor I. Magda, Valentin S. Mukhin, and Victor G. Sinitsin. "Radio Frequency Oscillations in Gyrotropic Nonlinear Transmission Lines." Plasma 2, no. 2 (June 8, 2019): 258–71. http://dx.doi.org/10.3390/plasma2020018.

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The paper considers the quasi-monochromatic radio frequency oscillations that are observable in transmission lines of doubly connected cross-sections, partially filled with a magnetized ferrite. The frequencies and amplitudes of the oscillations appearing under the impact of short carrier-free electric pulses are determined by dispersive and non-linear properties of the line’s structure. The dispersion characteristics are governed by the geometry and size of the line and the spatial arrangement in the line of the ferromagnetic material with its intrinsic dispersion. The dependences shown by the oscillation parameters in real physical experiments are reproduced and analyzed via numerical simulation within models which account separately for different physical properties of the material and the structure.
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Poun Raj, K., V. Raja Sekaren, S. Selvaperumal, and N. Mageswari. "Performance Investigation of D-Q Model for PI and Fuzzy Controller Based UPFC." Applied Mechanics and Materials 573 (June 2014): 310–16. http://dx.doi.org/10.4028/www.scientific.net/amm.573.310.

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– The unified power flow controller (UPFC) is the most versatile and complex power electronic equipment that has emerged as the indispensable equipment for the control and optimization of power flow in electrical power transmission system. In this manuscript is investigated the control of real and reactive power flow through a transmission line with the use of UPFC at the sending end. Computer simulation using MATLAB Simulink is done and the behavior of the UPFC is studied. In the UPFC based control of transmission line parameter control systems, it is observed that whenever the SSSC sources some real power into the transmission line it is manifested as a voltage drop across the DC link. Reactive power demand is indicated as fall in the bus bar AC voltage. The fall of the DC link voltage is an indication of real power demand from the receiving end. Similarly a fall of the bus bar AC voltage is an indication of reactive power demand from the receiving end. Fuzzy Logic and PI controllers are used in this works, the control of DC voltage, AC voltage and power transfer.
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Kononov, Yuri, Evgenii Zelenskii, Olga Rybasova, Dmitrii Kostyukov, and Ekaterina Bakaushina. "Estimation of 500 kV power transmission line parameters with PMU." E3S Web of Conferences 279 (2021): 01014. http://dx.doi.org/10.1051/e3sconf/202127901014.

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This work is devoted to the research of the real-time estimation of 500 kV power transmission lines parameters with PMU based on the solution of the optimization problem of minimizing the root-mean-square deviations of the specific line parameters or the sum of the modules of the correlation coefficients between the specific parameters and the sum of the squares of the voltages or currents measured at the ends of the line. Independent optimization variables are the correction factors of the measuring systems of currents and voltages. Based on an artificially simulated PMU dataset with specified Gaussian noise and systematic errors, it is shown that the use of correlation coefficients in the objective function is more effective than standard deviations. All 5 estimated coefficients turned out to be closer to the reference values. The results of calculations are obtained from the data of real PMUs for an operating 500 kV line with a length of 504.6 km. The deviation of the specific capacitive conductivity from the nominal value is 0.13%, compared with - 0.29% when using the sum of squares of deviations as an objective function.
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29

Siddiqui, Zahid Ali, and Unsang Park. "A Drone Based Transmission Line Components Inspection System with Deep Learning Technique." Energies 13, no. 13 (June 30, 2020): 3348. http://dx.doi.org/10.3390/en13133348.

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Defects in high voltage transmission line components such as cracked insulators, broken wires rope, and corroded power line joints, are very common due to continuous exposure of these components to harsh environmental conditions. Consequently, they pose a great threat to humans and the environment. This paper presents a real-time aerial power line inspection system that aims to detect power line components such as insulators (polymer and porcelain), splitters, damper-weights, power lines, and then analyze these transmission line components for potential defects. The proposed system employs a deep learning-based framework using Jetson TX2 embedded platform for the real-time detection and localization of these components from a live video captured by remote-controlled drone. The detected components are then analyzed using novel defect detection algorithms, presented in this paper. Results show that the proposed detection and localization system is robust against highly cluttered environment, while the proposed defect analyzer outperforms similar researches in terms of defect detection precision and recall. With the help of the proposed system automatic defect analyzing system, manual inspection time can be reduced.
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Wang, De Quan, Jia Lin Li, Jin Hua Ding, Teng Gao, and Tian Ji. "Application of Digital Factory Technology for Transmission Production Line." Applied Mechanics and Materials 385-386 (August 2013): 1823–26. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1823.

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In order to meet the development of economic globalization, a gearbox manufacturers need to optimize the production management through using digital factory technology to improve their market competitiveness. According a transmission production line industry characteristics and business processes, the digital factory information systems integrate ERP, MES and ANDON system making the real-time information flow. The system has been actually run in the company, passed technical appraisal and meet the design requirements.
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31

Yang, Zhen Wei, Wei Yi, and Yu Jin. "Application Research on the Intellectual Inspection System of Transmission Line Based on the “Mobile Information Platform”." Applied Mechanics and Materials 596 (July 2014): 719–22. http://dx.doi.org/10.4028/www.scientific.net/amm.596.719.

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The power transmission line is one of the important parts of electrical power system, the management and in-spection of the transmission lines have been significant routine job ensuring the reliability of the transmission system. According to actual requirements and characteristics of Transmission line inspection, the intellectual inspection system of transmission line based on Mobile information platform was designed using Geographic Information System (GIS). This novel inspection system was composed of GIS,Global Positioning System (GPS), PDA and GPRS. The system changes the traditional inspection modes.Owing to the advantages of high reliability, practicability and scalability, the practical application of this intellectual inspection system shows that it completely meets the requirements for fast speed, high efficiency and real-time performance.
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32

Hassanein, Wael S., Marwa M. Ahmed, Mohamed I. Mosaad, and A. Abu-Siada. "Estimation of Transmission Line Parameters Using Voltage-Current Measurements and Whale Optimization Algorithm." Energies 14, no. 11 (June 1, 2021): 3239. http://dx.doi.org/10.3390/en14113239.

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Real-time estimation of transmission line (TL) parameters is essential for proper management of transmission and distribution networks. These parameters can be used to detect incipient faults within the line and hence avoid any potential consequences. While some attempts can be found in the literature to estimate TL parameters, the presented techniques are either complex or impractical. Moreover, none of the presented techniques published in the literature so far can be implemented in real time. This paper presents a cost-effective technique to estimate TL parameters in real time. The proposed technique employs easily accessible voltage and current data measured at both ends of the line. For simplicity, only one quarter of the measured data is sampled and utilized in a developed objective function that is solved using the whale optimization algorithm (WOA) to estimate the TL parameters. The proposed objective function comprises the sum of square errors of the measured data and the corresponding estimated values. The robustness of the proposed technique is tested on a simple two-bus and the IEEE 14-bus systems. The impact of uncertainties in the measured data including magnitude, phase, and communication delay on the performance of the proposed estimation technique is also investigated. Results reveal the effectiveness of the proposed method that can be implemented in real time to detect any incipient variations in the TL parameters due to abnormal or fault events.
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33

Lis, Robert Andrzej. "Decision Tree Algorithm for Real-Time Identification of Critical Voltage Control Areas." Applied Mechanics and Materials 666 (October 2014): 132–37. http://dx.doi.org/10.4028/www.scientific.net/amm.666.132.

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Voltage stability, is driven by the balance of reactive power in a transmission power grid, and depends on the reactive power produced by the power stations and the value generated by the capacitive power lines and static compensators. Of particular interest is to identify those Critical Voltage Control Areas (CVCAs) in a transmission power grid, that may suffer reactive power deficiencies. Since speed of analysis is critical for on-line applications the approach will address the development of a scheme whereby CVCAs can be identified using data mining techniques from on-line power system snapshot (PMU). The database for storing/retrieving result of Modal Analysis can be used to construct decision trees (DTs) for each of the identified CVCAs using key power system attributes. The objective of this paper is to propose an new real-time methodology for identification of CVCAs, which is key function for preventive and remedial actions against instability of the Electrical Power System (EPS). This is carried out under various system operation and contingency conditions by using off-line trained decision trees generated and on-line PMU measurements. Numerical results on the 12-bus test system, shows the suitability and effectiveness of the proposed method.
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34

Karuppiah, N., S. Muthubalaji, S. Ravivarman, Md Asif, and Abhishek Mandal. "Enhancing the performance of Transmission Lines by FACTS Devices using GSA and BFOA Algorithms." International Journal of Engineering & Technology 7, no. 4.6 (September 25, 2018): 203. http://dx.doi.org/10.14419/ijet.v7i4.6.20463.

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Flexible Alternating Current Transmission System devices have numerous applications in electrical transmission lines like improvement of voltage stability, reactive power compensation, congestion management, Available Transfer Capacity enhancement, real power loss reduction, voltage profile improvement and much more. The effectiveness of these FACTS devices is enhanced by the placement of these devices in the transmission lines. The placement is based on transmission line sensitivity factors such as Bus voltage stability index and line voltage stability index. This research article focuses on optimizing the location, number and ratings of FACTS devices using Evolutionary Algorithms like Bacterial Foraging Algorithm and Gravitational search algorithm. FACTS devices such as Static Var Compensator, Thyristor Controlled Series Capacitor and Unified Power Flow Controller are placed on IEEE 14 bus and IEEE 30 bus systems for reducing the real power loss in the transmission system. The results show that the performance of the transmission lines is enhanced more using Bacterial Foraging Algorithm than Gravitational Search Algorithm.
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35

Beryozkina, Svetlana. "Evaluation Study of Potential Use of Advanced Conductors in Transmission Line Projects." Energies 12, no. 5 (March 1, 2019): 822. http://dx.doi.org/10.3390/en12050822.

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Transmission networks recently faced new technical and economic challenges. The direct use of advanced technologies and modern methods could solve these issues. This paper discusses the potential application of straightforward technology such as high-temperature low-sag conductors (HTLScs) as an additional measure for the protection and effective operation of overhead power lines. An evaluation was conducted to determine an approach for selecting the cross-sectional area and type of conductor with respect to a fault current limitation. It showed the potential benefits of using HTLScs based on an assessment of the throughput capacity and up-front capital costs. A case study considered two scenarios: the construction of a new power line and reconductoring of the existing one. The data for a real project with two overhead power lines were used. The obtained results are analyzed and discussed in detail in this paper.
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36

Gu, Teng Fei, Jun Wen, Jia Liang Wen, Jing Wu, Xiao Xia Liu, and Yu Gao. "Comparative Study of the Methods to Increase AC Transmission Lines Capacity." Applied Mechanics and Materials 347-350 (August 2013): 1363–67. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.1363.

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There are some traditional methods to increase AC transmission lines capacity, such as: improve voltage level, increase wire cross section area, use compact transmission line, add FACTS equipment and improve the temperature of the wire. A new method with converting ac line to dc line to increase the power capacity of AC transmission lines was put out in recent years. The fundamental principal and working characteristics of the method mentioned above are described in this paper together with the comparative analysis based on the existing experimental results and real data on technical level and economic level.
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37

Tian, Li, Wenming Wang, and Hui Qian. "The Effect Analysis of Strain Rate on Power Transmission Tower-Line System under Seismic Excitation." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/314605.

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The effect analysis of strain rate on power transmission tower-line system under seismic excitation is studied in this paper. A three-dimensional finite element model of a transmission tower-line system is created based on a real project. Using theoretical analysis and numerical simulation, incremental dynamic analysis of the power transmission tower-line system is conducted to investigate the effect of strain rate on the nonlinear responses of the transmission tower and line. The results show that the effect of strain rate on the transmission tower generally decreases the maximum top displacements, but it would increase the maximum base shear forces, and thus it is necessary to consider the effect of strain rate on the seismic analysis of the transmission tower. The effect of strain rate could be ignored for the seismic analysis of the conductors and ground lines, but the responses of the ground lines considering strain rate effect are larger than those of the conductors. The results could provide a reference for the seismic design of the transmission tower-line system.
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38

Pabst, Willi, Jan Hostaša, and Laura Esposito. "Porosity and pore size dependence of the real in-line transmission of YAG and alumina ceramics." Journal of the European Ceramic Society 34, no. 11 (September 2014): 2745–56. http://dx.doi.org/10.1016/j.jeurceramsoc.2013.12.053.

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39

Tian, Li, Qian Wang, Qiqi Yu, and Nuwen Xu. "Wind-induced Vibration Optimal Control for Long Span Transmission Tower-line System." Open Civil Engineering Journal 7, no. 1 (October 31, 2013): 159–63. http://dx.doi.org/10.2174/1874149501307010159.

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In this paper, tuned mass dampers with optimal parameters for long span transmission tower-line system are investigated. Equations of motion for a structure-TMD system are derived, and the parameters of TMD, stiffness and damping are optimized, respectively. According to a real project, three-dimensional finite element models of both transmission tower and transmission tower-line system are created and their vibration performances are analyzed using SAP2000 software, respectively. Wind load time history is simulated based on wind theory. Using numerical simulation, vibration control with optimal tuned mass damper installed in transmission tower-line system is carried out. Time history curves and the maximum responses of system without and with tuned mass damper under wind excitation are analyzed and discussed. The results show that the optimal tuned mass damper could effectively decrease the wind-induced response of long span transmission tower-line system.
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40

Chen, Bo, Xiang Xiao, Peng-yun Li, and Wan-li Zhong. "Performance Evaluation on Transmission Tower-Line System with Passive Friction Dampers Subjected to Wind Excitations." Shock and Vibration 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/310458.

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The vibration control and performance evaluation on a transmission-tower line system by using friction dampers subjected to wind excitations are carried out in this study. The three-dimensional finite element (FE) model of a transmission tower is firstly constructed. A two-dimensional lumped mass model of a transmission tower is developed for dynamic analysis. The analytical model of transmission tower-line system is proposed by taking the dynamic interaction between the tower and the transmission lines into consideration. The mechanical model of passive friction damper is presented by involving the effects of damper axial stiffness. The equation of motion of the transmission tower-line system incorporated with the friction dampers disturbed by wind excitations is established. A real transmission tower-line system is taken as an example to examine the feasibility and reliability of the proposed control approach. An extensive parameter study is carried out to find the optimal parameters of friction damper and to assess the effects of slipping force axial stiffness and hysteresis loop on control performance. The work on an example structure indicates that the application of friction dampers with optimal parameters could significantly reduce wind-induced responses of the transmission tower-line system.
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41

Mejdoub, Youssef, Hicham Rouijaa, and Abdelilah Ghammaz. "Optimization circuit model of a multiconductor transmission line." International Journal of Microwave and Wireless Technologies 6, no. 6 (February 28, 2014): 603–9. http://dx.doi.org/10.1017/s1759078714000129.

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This paper presents an optimization circuit model of multiconductor transmission lines in the time domain. Several methods allow calculation of the currents and the tensions distributed on the uniform transmission line. Most of these methods are limited to lines with constant losses, and only for linear loads. The macro-model we propose, using Pade approximant, employs more variables and allows it to reduce the necessary cells' number in modelization than the traditional cells cascade method. This macro-model, using the Modified Nodal Analysis method (MNA), is suitable for an inclusion in circuit simulator, such as Esacap, Spice, and Saber. The MNA method offers an efficient means to discretize transmission lines on real and complex cells compared to the conventional lumped discretization. In addition, the model can directly handle frequency-dependent line parameters in the time domain. An example, with experimental measures taken from literature, is presented to validate the model we propose, and show its importance. It is necessary for assuring the results validity obtained from Pade macro-model to study its stability and passivity.
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42

Chen, Bo, Shun Weng, Lunhai Zhi, and Dongming Li. "Response control of a large transmission tower-line system under seismic excitations using friction dampers." Advances in Structural Engineering 20, no. 8 (December 26, 2016): 1155–73. http://dx.doi.org/10.1177/1369433216679999.

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The transmission tower-line system is widely used in electric infrastructures across the world and generally possesses a small stiffness and low structural damping. The excessive vibration of a transmission tower-line system subjected to seismic excitations may induce a structural damage or failure. To avoid the excessive vibration under strong earthquakes, a large transmission tower-line system requires some measures to abate their dynamic responses. Friction damper is a solution to realize the response control of a transmission tower-line system. In this regard, the response mitigation and performance assessment on a transmission tower-line system with friction dampers under strong earthquakes are actively carried out in this study. The analytical model of a transmission line is proposed based on Hamilton’s variational statement of dynamics and Lagrange’s formulation. A two-dimensional lumped mass model of a transmission tower is developed for the dynamic analysis by simplifying the three-dimensional finite element model. The mechanical model of a friction damper is established by considering the effect of damper axial stiffness. The equations of motion and dynamic analytical method of a transmission tower-line system without/with friction dampers subjected to seismic excitations are proposed. In addition, the approach for assessing energy responses of a transmission tower-line system without/with friction dampers subjected to seismic excitations is also developed. A real transmission tower-line system is taken as an example to examine the feasibility of the proposed control approach. The parametric study is conducted to investigate the effects of damper control force, damper stiffness, earthquake intensity, and damper location. The made observations demonstrate that the implementation of friction dampers in a transmission tower-line system can substantially suppress the seismic responses with optimal damper parameters.
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43

Abdelkader, Ben Slimane, and Chelleli Benachiba. "Power Quality Enhancement Using the Interline Power Flow Controller." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 3 (September 1, 2015): 415. http://dx.doi.org/10.11591/ijpeds.v6.i3.pp415-422.

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Interline Power Flow Controller (IPFC) is one of the latest generation Flexible AC Transmission system (FACTS). It is able to control simultaneously the power flow of multiple transmission lines. This paper presents a study of the impact the IPFC on profile of voltage, real and reactive power flow in transmission line in power system. The obtained results are interesting.
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44

Chen, Zai Ping, Feng Liu, and Quan Sheng Sun. "Zigbee Technology in the Application of Remote Monitoring System of Tubular Furnace." Advanced Materials Research 753-755 (August 2013): 2252–55. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2252.

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In view of the problem about off-line monitoring lagging and the high cost of cable transfer with present traditional petrochemical enterprise, this article provides remote monitoring system design and implementation of the heating furnace based on the Zigbee wireless transmission technology. Specifically, configuration software can realized real-time monitoring of furnace combustion condition by sending detected smoke real-time data which goes through flue gas analyzer to Siemens PLC, and transferring it to the industrial computer by Zigbee wireless transmission technology. Simulation result shows that the system has well real-time performance and low power consumption advantages which can complete effective monitoring in the wireless environment of furnace combustion state.
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45

Lin, Yi Feng, Hong Yang Jin, and Ke Ding. "Research on Positioning System of Insulator String Flashover in High Voltage Transmission Line." Advanced Materials Research 655-657 (January 2013): 753–56. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.753.

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Considering that insulator flashover accident frequently occurs in high voltage transmission line, a kind of insulator string flashover positioning system is designed. The positioning system is on based on the fact that ultrasonic and ultraviolet energy is released when flashover occurs. To make sure whether a flashover accident occurred, sensors are used to detect ultrasonic and ultraviolet waves near the insulators in real time. The detecting results and accident position information will be uploaded to the monitoring center wirelessly using GSM/GPRS (Global System of Mobile communication / General Packet Radio Service), which can make it easy and fast for operating personnel to locate the accident, reduce troubleshooting work and quickly recovery power transmission. The experiment shows that the system has lots of advantages such as high sensitivity, high positioning accuracy, more stable and so on.
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46

CHEN, BO, JIN ZHENG, and WEILIAN QU. "CONTROL OF WIND-INDUCED RESPONSE OF TRANSMISSION TOWER-LINE SYSTEM BY USING MAGNETORHEOLOGICAL DAMPERS." International Journal of Structural Stability and Dynamics 09, no. 04 (December 2009): 661–85. http://dx.doi.org/10.1142/s0219455409003235.

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Transmission tower-line system is a high-rise structure with low damping and it is therefore prone to strong wind excitation. In this paper, the control of wind-induced response of transmission tower-line system is carried out by using magnetorheological (MR) dampers. The effects of brace stiffness of damper are introduced and a multi-degree-of-freedom (MDOF) model is developed for both in-plane/out-of-plane vibration of transmission tower-line system. Two semi-active control strategies are proposed for the vibration mitigation of tower-line system. The first one is based on fixed increment of controllable damper force whereas the second one is a clipped-optimal strategy based on fuzzy control principle. The optimal parameters of the MDOF model of transmission line are investigated. A real transmission tower-line system constructed in China is taken as an example to examine the feasibility and reliability of the proposed approach. A parametric study is conducted for the effects of brace stiffness of MR damper, wind loading intensity, and parameters of MR fluids on the control performance. The results demonstrate that the incorporation of MR dampers into the transmission tower-line system can substantially suppress the wind-induced responses of transmission tower if the damper parameters are optimally determined. The performance of the two kinds of semi-active control approaches is better than that of a passive control approach.
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47

Feng, Wei Ming, Su Quan Zhou, Tai Shan Xu, Qiang Liu, and Ji Lai Yu. "The Calculation of Line Fault Probability in Ice Storm." Applied Mechanics and Materials 441 (December 2013): 300–303. http://dx.doi.org/10.4028/www.scientific.net/amm.441.300.

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In this paper a line fault probability calculation method by the combined effects of icing and wind is developed. Considering the force effect of icing and wind on the transmission lines, an icing-wind load is presented. It can be used to calculated the real-time or predict line fault probability using the characteristic exponential model reflecting metal resisting capacity. The example using historical meteorological data and simulating grid is given and the results show that, icing-wind load presented in this paper makes the calculate result of failure probability more serious. The line fault probability is helpful for the further grid security control.
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48

Liu, Song Xiang, Wei Xiao, Hong Bo Chen, Huan Bai, Yun Feng, and Xin Fang. "Temperature Measurements for Transmission Lines Based on Passive Optical Sensing." Applied Mechanics and Materials 543-547 (March 2014): 1035–41. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.1035.

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In order to achieve real-time monitoring of high-voltage lines, a temperature measurement system for transmission lines based on the online passive FBG sensors is proposed. The temperature linearity of the FBG sensors designed by bi-metal package is greater than 0.999, which guarantees great mechanical strength and temperature measurement performance. The sensors are fixed to the lines by a specially designed fixture. This temperature measurement system for transmission lines based on optical sensing is running on 110kV line with strong scalability, which could monitor temperature changes of the conductor in real time.
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49

Akgün, Ömer, Tahir Çetin Akıncı, Gökhan Erdemir, and Serhat Şeker. "Analysis of instantaneous frequency, instantaneous amplitude and phase angle of ferroresonance in electrical power networks." Journal of Electrical Engineering 70, no. 6 (December 1, 2019): 494–98. http://dx.doi.org/10.2478/jee-2019-0084.

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Abstract Ferroresonance is a nonlinear phenomenon that damages the undesired, destructive system for energy transmission lines. The formation and development of this overvoltage ferroresonance phenomenon is an important research topic as a mysterious event in energy power systems. In this study, Seyit Omer-Iklar energy transmission line from Turkey’s electrical transmission networks was modelled using real parameters. Ferroresonance scenario was created on the model. The energy transmission system with the scenario is set to a simulation time of 4 seconds. The first two seconds are set to normal. By cutting off the transmission line in the 2nd sec., the system is provided with ferroresonance drift. According to the data obtained therefrom, spectrograms, instantaneous amplitude, instantaneous frequency and instantaneous phase were conducted. The analyses have made clear that the instantaneous frequency amplitude defined the system’s ferroresonance moment very well.
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50

Parmantier, J. P., C. Guiffaut, D. Roissé, C. Girard, F. Terrade, S. Bertuol, I. Junqua, and A. Reinex. "Modelling EM-Coupling on Electrical Cable-Bundles with a Frequency-Domain Field-to-Transmission Line Model Based on Total Electric Fields." Advanced Electromagnetics 9, no. 3 (December 7, 2020): 15–31. http://dx.doi.org/10.7716/aem.v9i3.1531.

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This article deals with modelling of EM-coupling on cable-bundles installed in 3D structures. It introduces a modified-Field-to-Transmission-Line model for which the specificity is to account for the reciprocal interaction between EM-fields and induced currents by considering equivalent total field sources. The first part of the paper is devoted to the derivation of this model starting from Agrawal’s classical Field-to-Transmission-Line applied on a two-wire Transmission-Line and leads to a Transmission-Line model in which the signal-wire is now referenced to a fictitious surrounding cylinder acting as a return conductor. The modified-Field-to-Transmission-Line model is then obtained by modifying this derived-model in such a way that is made compatible with numerical approaches and tools based on Agrawal’s Field-to-Transmission-Line model. This modification involves a kL coefficient equal to the ratio of the two per-unit-length inductances of the classical and derived Field-to-Transmission-Line models. Validations of this modified formulation clearly show the capability of this model to predict precise wire responses including EM-radiation losses. The second part of the paper is devoted to its extension to Multiconductor-Transmission-Line-Networks. The process relies on the capability to define an equivalent wire model of the cable-bundle in order to derive the kL coefficient and to numerically evaluate equivalent total field sources. Validation of this extrapolation is presented on a real aircraft test-case involving realistic cable-bundles in order to assess the potentiality of the method for future problems of industrial complexity.
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