• Title/Summary/Keyword: Transmission

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Dynamic response of an overhead transmission tower-line system to high-speed train-induced wind

  • Zhang, Meng;Liu, Ying;Liu, Hao;Zhao, Guifeng
    • Wind and Structures
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    • v.34 no.4
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    • pp.335-353
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    • 2022
  • The current work numerically investigates the transient force and dynamic response of an overhead transmission tower-line structure caused by the passage of a high-speed train (HST). Taking the CRH2C HST and an overhead transmission tower-line structure as the research objects, both an HST-transmission line fluid numerical model and a transmission tower-line structure finite element model are established and validated through comparison with experimental and theoretical data. The transient force and typical dynamic response of the overhead transmission tower-line structure due to HST-induced wind are analyzed. The results show that when the train passes through the overhead transmission tower-line structure, the extreme force on the transmission line is related to the train speed with a significant quadratic function relationship. Once the relative distance from the track is more than 15 m, the train-induced force is small enough to be ignored. The extreme value of the mid-span dynamic response of the transmission line is related to the train speed and span length with a significant linear functional relationship.

Transmission Loss Prediction of KHST's Wall Section (KHST 차량 벽면의 투과손실값 예측)

  • Kim, Kwan-Ju;Yoon, Tae-Jung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.104-109
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    • 2002
  • The purpose of this study is to calculate transmission loss of KHST passenger vehicle's wall section accurately Typical transmission loss measurement of wall in the laboratory condition was carried out in advance, which is easier than KHST. Transmission loss results were compared with those by statistical acoustic method. Transmission loss values of KHST calculated by experimental method are compared with those from closed form solution.

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Progress and application on the insulation design of overhead transmission line in Korea (국내 가공송전선로 절연설계기술의 발전 및 적용)

  • Yoo, Chol-Hwan;Kim, Kyeong-Ho;Park, Soon-Kyu
    • Proceedings of the KIEE Conference
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    • 2000.07a
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    • pp.416-418
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    • 2000
  • Main power transmission network in Korea is consist of 154kV, 345kV transmission lines. Also 765kV transmission lines are on construction currently. There are some differences in the insulation design concept, methods and contents on 154kV, 345kV and 765kV overhead transmission lines respectively. In this paper, we described and summarized the applied insulation design concept, methods and features on each transmission lines.

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Transmission Loss Prediction of KHST′s Wall (KHST 차량 벽면의 투과손실값 예측)

  • Kim, Kwanju;Taejung Yoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.317.2-317
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    • 2002
  • Transmission loss of KHST passenger vehicle was calculated using measured acoustic data: In order to verify the transmission loss results for KHST case, similar experiment was carried out in laboratory condition, which result was compared those by geometric acoustic method. The computational results shows good agreement with the transmission loss magnitude from experiments. This paper also mentions items to obtain more accurate transmission loss values, i. e. how to assure reverberant field condition, the selection of source speaker' location.

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A study on Subspan Oscillation Analysis of 6 Bundle Conductor Transmission lines (6도체방식 송전선로의 서브스판진동 해석에 관한 연구)

  • 이형권
    • Journal of KSNVE
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    • v.7 no.5
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    • pp.729-736
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    • 1997
  • The subspan oscillation is the most important in bundled transmission lines, which can cause conductor damage and transmission line hardware failures. So it is necessary to analyze the subspan oscillation in details for transmission lines. This paper suggests the basic concept and theoretical analysis method of subspan oscillation for 6 bundle conductor transmission line, which considers wind speed, subspan length and conductor tension. Especially this paper uses a spacer damper model with clamp-arm flexibility and damping characteristics. Theoretical analysis results are proposed.

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On the Limitation of Telegrapher′s Equations for Analysis of Nonuniform Transmission Lines

  • Kim, Se-Yun
    • Journal of electromagnetic engineering and science
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    • v.4 no.2
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    • pp.68-71
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    • 2004
  • The limitation of telegrapher's equations for analysis of nonuniform transmission lines is investigated here. It is shown theoretically that the input impedance of a nonuniform transmission line cannot be derived uniquely from the Riccati equation only except for the exponential transmission line of a particular frequency-dependent taper. As an example, the input impedance of an angled two-plate transmission line is calculated by solving the telegrapher's equations numerically. The numerical results suffer from larger deviation from its rigorous solution as the plate angle increases.

Cost Comparison of FACTS Devices and Conventional Transmission Devices (FACTS 송전 설비와 기존 송전 설비의 경제성 비교)

  • Choi, Joon-Young
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.308-310
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    • 1998
  • In this paper, cost of FACTS devices and that of conventional 345kV transmission devices that transmit scheduled amount of electricity from one point to other point for thirty years is calculated and compared to each other. In case of long distant transmission, cost of FACTS devices is smaller compared to that of conventional 345kV transmission devices, and in case of short distant transmission cost of FACTS devices is bigger than that of conventional transmission devices.

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Improved Method of Characteristics for Two way Subscriber Transmission Systems

  • Phetsomphou, Douangsamone;Tsuchiya, Naosuke;Tanaka, Kimio
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.1355-1359
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    • 2004
  • The two way subscriber transmission systems have tendency to spread its carrier frequency bandwidth or information bit rate and average bit error rate according to popularization of high speed information through the digital communication system, transmission medium and the Internet. This fact is an important incentive to realize new systems. These two way subscriber transmission systems usually use same cable or same carrier frequency bandwidth for up stream channel and down stream channel. In the systems, the disturbances of noise, crosstalk or fading affect the characteristics. Specifically, these disturbances cause the decrease of information bit rate and degradation of transmission quality. This paper proposes the improved method of their degradations using the particular feature of two way subscriber transmission systems and it makes clear proposed method is effective by theoretically and some numerical examples.

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A Study on a Criterion of Transmission Planning in a Competitive Electricity Market (경쟁적 전력시장에서 혼잡을 고려한 송전설비계획 기준설정에 관한 연구)

  • Kim Jong-Man;Han Suck-Man;Kim B.H.
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.7
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    • pp.358-365
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    • 2005
  • Transmission networks play an important role which transfer generated electric power to a consumer in power system operation. In a competitive environment of electric power industry, developing the technological criterions and methodologies on transmission planning is becoming new challenge to transmission system planner. The use of a locational signal and the provision of a indicative plan to control the transmission investment reasonably is very important in the viewpoint of a regulator. The main target of this study is to develop a systematic criterion of transmission expansion planning. And system congestion cost is considered. The proposed methodology was demonstrated with several case studies.

An Energy-Efficient Transmission Strategy for Wireless Sensor Networks (무선 센서 네트워크에서 에너지 효율적인 전송 방안에 관한 연구)

  • Phan, Van Ca;Kim, Jeong-Geun
    • Journal of Internet Computing and Services
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    • v.10 no.3
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    • pp.85-94
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    • 2009
  • In this work we propose an energy-efficient transmission strategy for wireless sensor networks that operate in a strict energy-constrained environment. Our transmission algorithm consists of two components: a binary-decision based transmission and a channel-aware backoff adjustment. In the binary-decision based transmission, we obtain the optimum threshold for successful transmission via Markov decision process (MDP) formulation. A channel-aware backoff adjustment, the second component of our proposal, is introduced to favor sensor nodes seeing better channel in terms of transmission priority. Extensive simulations are performed to verify the performance of our proposal over fading wireless channels.

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