• Title/Summary/Keyword: Power line noise

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An Experimental Study on the Interior Noise for Passenger and Power cars (객차 및 동력차 실내소음에 관한 실험적 연구)

  • 문경호;유원희;김재철
    • Proceedings of the KSR Conference
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    • 2000.11a
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    • pp.150-156
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    • 2000
  • The purpose of this paper is to evaluate the noise level and the noise source for domestic trains. We measured and analyzed the interior noise, the rolling noise and the engine noise at Honam line(Seodaejeon-Jangseong) for passenger and power cars. The noise level is below 69㏈A for Seamaeul PMC(Powered Motor Car) coachs, below 65㏈A for Seamaeul and Mukungwha coachs, over 80㏈A for the driver's room of PMC and diesel-electric locomotives.

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Environmental Noise Prediction of Power Plants (발전소 환경소음 예측)

  • 조대승;유병호
    • Journal of KSNVE
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    • v.7 no.4
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    • pp.621-629
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    • 1997
  • For computer aided design and costruction of low noisy power plants, indoor and outdoor noise prediction program has been developed. The program utilizes the predefined data of noise sources and building materials and has the faculty to estimate the source level using the empirical formula in case of the measured data not being available. In the noise prediction, the mutual noise propagation between indoor and outdoor sites are considered. The outdoor noise source in the calculation of geometric divergence effects is modelled as the omni-directional finite line or planar source according to the source geometry and the receiving points. Outdoor noise prediction is carried out to consider the diffraction effect due to plant structures as well as the attenuation effect due to atmospheric absorption and soft ground. The results of indoor and outdoor noise prediction for a recently constructed diesel engine power plant show good agreement with the measured.

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Prediction of Noise Power Disturbance from Antenna to Transmission Line System (안테나로부터 인접 전송선로에 전달되는 노이즈 전력 예측)

  • Ryu, Soojung;Jeon, Jiwoon;Kim, Kwangho;Jo, Jeongmin;Lee, Seungbae;Kim, SoYoung;Nah, Wansoo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.11
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    • pp.1172-1182
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    • 2014
  • In these days, many kinds of goods are more light and more integrated. As frequency range of mobile applications have increased to improve performance of antenna furthermore, EMI(ElectroMagnetic Interference) problem has frequently caused by disturbance of antenna in device which aggravates other circuit. This paper proposes a technique for the prediction of noise power to the transmission line from antenna located near the line. Although noise power transferred to transmission line is varied by source impedance of antenna and load impedance of transmission line basically, the power magnitude can be presented in a square form of S-parameter between antenna and transmission line due to small variation of transferred power. For this reason, we can use the index expressed the transferred power varied along geometrical shapes of transmission line. As a result, big difference is occurred along location of antenna especially the bended line. And this such experiment is correspond with simulation, these results have meaning physically considering electromagnetic field distribution in near and far field. HFSS of Ansys and CPW with ground is used in this paper.

Power Line Simulator Development for Communication Channel (통신 채널로써 전력선 시뮬레이터 개발)

  • Park, Chong-Yeun;Jung, Dong-Youl
    • Journal of Industrial Technology
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    • v.19
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    • pp.81-89
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    • 1999
  • We have developed a power line simulator which is one of the basic tools for the research of the power line communication and its control system. In the developed simulators, we have considered the transfer function of the power line, noises and signal attenuation characteristics. Simulator was made using the matlab tool program. We made the power line modern using the FSK chip(ST7537) and experimentalized to show the efficiency grade of simulator. We have expected that the developed simulators are very useful in the area for the power line communication research and the control system design.

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Construction of Spread Spectrum Power Line Communication Equipment Using Power Line Synchronization (전원동기를 이용한 스펙트럼 확산 전원선 통신장치의 구성)

  • 이동욱;변건식;김명기
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.15 no.6
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    • pp.475-484
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    • 1990
  • This paper proposes a method for the implementation of a power line communication equipment using power line synchronization in a direct-sequence spread spectrum communication system. In order to implement a network using a power line as a transmission channel we have investigated the utilization of direct-sequence speread spctrum which gives such advantages as robustness against narrow-band interference and noise, and realization of multiple access. In a power line, however, complexity of synchronization makes it difficult to realize a multiple access and cost down and system simplification. The proposed technique of power line synchronization makes it possible to get cost down and system size small, and the realization of multiple communication can be achieved by the addition of address setting circuit.

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Simulator Development for Power Line Communication Channel (전력선 통신채널의 시뮬레이터 개발)

  • Park, Jong-Yeon;Jeong, Dong-Yeol
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.49 no.9
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    • pp.546-553
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    • 2000
  • W e have developed a power line simulator which is one of the basic tools for the research of the power line communication and its control system. In the developed simulators, we have considered the transfer function of the power line, noises and signal attenuation characteristics. Simulator was made using the matlab tool program. We made the power line modem using the FSK chip(ST7537) and experimentalized to show the efficiency grade of simulator. We have expected that the developed simulators are very useful in the area for the power line communication research and the control system design.

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A Realization Method of DS/SS System for A Cyclic Noise Adaptation on Power Line Channels (전력선 채널의 주기적 잡음 적응형 DS/SS 시스템의 구현 방법)

  • Jung, Kwang-Hyun;Park, Chong-Yeun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.47 no.2
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    • pp.47-55
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    • 2010
  • The power line communication channel has characteristic variation problems which are caused by load. The spread spectrum technique has been used to overcome these problems. One of that is the direct sequence spread spectrum(DS/SS) system which is not necessary to additional hardwares. The BER of DS/SS system is decreased by longer length of PN code, but data transfer rate is decreases, so data transfer rate is hard to satisfies their own specifications especially in narrowband PLC systems. Spread Spectrum system with Dual-processing Gain tries to reflect cyclic characteristics of power line noise. But that system assumes that shapes of power line channel are symmetrical with respect to the 1/4 point of main frequency(60Hz in Korea), therefore cannot achieves various shapes of real power line noise. Thus in this paper, noise adaptive DS/SS system which PN code is changed by noise levels for various channel noises is proposed and simulated. The different kinds of noises are modeled and measured for simulation, the proposed system is verified that has lower data transfer rate and lower error rate than conventional system by simulation results.

Performance Analysis of Direct-Sequence Spread Spectrum(DSSS) System in Power Line Communications (전력선통신에서 직접확산 스펙트럼(DSSS) 계의 성능 분석)

  • Suh, Heejong;Zhou, Xiaozheng
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.11
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    • pp.25-32
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    • 2004
  • In this paper, we first analysed the ability of DSSS resistance against noises, which are main interferences to the four types in power line communications. Based on the characteristic of these noises, we made a noise source of power line which is similar with the result measured, in practice. We simulated and analysed the BER performance of BPSK with DSSS over this noise model and one without the DSSS, for comparison. Result showed that the BPSK with DSSS system has improved by 8 dB, as compared to those without the DSSS, as against power line noises.

Design and Frequency Characteristic Analysis of Shielded Isolation Transformer for the Power Line Noise Reduction (전원노이즈 억제용 차폐절연변압기의 설계 및 주파수특성 해석)

  • 이재복;허창수;이태호
    • Journal of the Korean Magnetics Society
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    • v.9 no.1
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    • pp.55-63
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    • 1999
  • It is necessary to eliminate the broad band noise whose frequency is in the range of several kHz to tens MHz generated from the AC power line to supply the power to electrical and electronic equipments. Because this kind of noise could damage or malfunction such equipments. To suppress those noises, some conventional devices such as a filter or surge suppressor have been used. However, they can not be isolated from the common-mode noise widely spreaded in all power line, which results in poor common-mode rejection performance. In this paper, we proposed a design method of shielded isolation transformer and a jumped circuit analysis model for shielded isolation transformer applicable to filtering common-mode noise as well as normal-mode noise. The analysis model has been verified as a suitable one for shielded isolation transformer through comparison of the simulation with experiment. In addition, it has been shown that the reduction performance for conducted noise of prototype 3 kVA shielded isolation transformer is superior to a unshielded isolation transformer.

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An Analysis of Characteristics of Underground Power line Communication Channel (지중 전력선 통신채널의 특성 해석)

  • Eom, Ki-Hwan;Shin, Jai-Ho;Lee, Seung-Joon
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.48 no.5
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    • pp.40-45
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    • 2011
  • In this paper, to develop a broadband power line communication modem and network technologies, we analysis the characteristics of underground power line communication channel through actual tests. To measure the amount of attenuation by length and structure of broadband power line communication channel, we configure a measurement system of the channel with signal generator, spectrum analyzer and non-contacted coupler. For actual tests, we choose two of the longest lines among medium-voltage lines as a single line in the test lines and measure the characteristics of noise and signal attenuation level of the channel. The experimental results show that the channel has a impulse noise which can remarkably reduce communication capability. In the case of long lines, high-frequency attenuation appeared by length of the lines.