• Title/Summary/Keyword: Electric power System

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Measurement of Ultra-high Frequency(UHF) noise spectra (GIS 변전소의 극초단파대역 잡음환경 측정)

  • Lim, Jae-Sup;Park, Ki-Jun;Goo, Sun-Geun;Yoon, Jin-Yul;Jung, Kil-Jo
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1768-1769
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    • 2003
  • 가스절연개폐장치(Gas-insulated Switchgear, GIS)의 예방진단 기술의 한 방법으로, 극 초단파(Ultrahigh frequency) 부분방전(Partial discharge) 센서를 사용하여 결함의 유무를 판별할 수 있다. 그러나 UHF PD 센서에는 부분방전신호 이외에 외부 잡음의 유입 가능성이 크다. 따라서 본 논문에서는 PD 센서 주변 잡음을 측정하기 위하여 $0{\sim}2$ GHz 의주파수영역에서 산지, 도심 지역의 변전소의 위치에 따른 외부 잡음을 측정하였다. 주파수 대역별로 FM 방송, TV 방송, 이동전화, 등의 신호를 판별하였다.

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Development of Monitoring and Control System of Utility-Pipe Conduit (Power Tunnel) using PLC

  • Lee, Tae-Young;Park, Byung-Seok;Ju, Seong-Ho;You, Dong-Hee;Lim, Yong-Hoon;Song, Seok-Young
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.116-119
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    • 2004
  • The existing monitoring and control systems of utility-pipe conduit (power tunnel, cable tunnel etc) have established communication lines using optical fiber, leaky coaxial cable (LCX), and several kinds of control cable. Due to the properties of the used media, the cost of equipment is considerably high and the maintenance of the system is difficult. Also, the term of carrying out is long so that the extension of the system is in difficulty. Now it is desirable to adopt Power Line Communication (hereinafter, PLC) technology in the monitoring and control systems and use the existing low-voltage power-line for lamplight as communication line. This will lead the reduction of the construction cost and the easy maintenance of the system. In this paper, we research the characteristics of PLC in conduit, design and manufacture the field test system, and analyze the performance of the system by field test. Then, we introduce the reliable monitoring and control system of utility-pipe conduit using PLC.

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Electric Leakage Point Detection System of Underground Power Cable Using Half-period Modulated Transmission Waveform and Earth Electric Potential Measurement (반주기 변조된 송신파형과 대지전위 측정을 이용한 지중 케이블 누전 고장점 탐지 시스템)

  • Jeon, Jeong Chay;Yoo, Jae-Geun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.12
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    • pp.2113-2118
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    • 2016
  • The precise detection of electric leakage point of underground power cable is very important to reduce cost and time of maintenance and prevent electric shock accident through expedite repair of electric leakage point. This paper proposes a electric leakage point detection system underground power cable using of half-period modulated transmission waveform and earth electric potential measurement. The developed system is composed of transmitter to generate the wanted pulse waveform, receiver to measure and display earth electric potential by the transmitted pulse in electric leakage point and PC Software program to display of GPS coordinate on detection cable line. The performance of the electric leakage point detection system was tested in the constructed underground cable leakage detection test bed. The test results on signal generation voltage precision of signal transmitter, mean detection earth voltage, mean detection leakage current and electric leakage point detection error showed the developed system can be used in electric leakage point detection underground power cable.

Study on the Estimation of Seasonal Ambient Current for the Application of Ambient Adjusted Line Rating(AAR) in Overhead Transmission Lines Using Risk Tolerance(RT) Method (가공송전선로의 AAR 적용 시 Risk Tolerance 분석을 이용한 계절별 최대 허용전류 산정 및 적용에 관한 연구)

  • Lee, Jaegul;Bae, Youngjae;Song, Jiyoung;Shin, Jeonghoon;Kim, Yonghak;Kim, Taekyun;Yoon, Yongbeum
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.1
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    • pp.7-15
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    • 2017
  • Ambient Adjusted line Rating(AAR) method for overhead transmission lines considering Risk Tolerance(RT) was proposed in this paper. AAR is suitable for system operators to plan their operation strategy and maintenance schedule because this can be designed as a seasonal line rating. Several candidate transmission lines are chosen to apply the proposed method in the paper. As a result, it is shown that system reliability was significantly enhanced through maximizing transfer capability, solving the system constraints.

Research and Analysis of Difference Hybrid DC Circuit Breaker Topologies for MVDC Distribution System (MVDC 배전시스템에서 다양한 복합형 직류 차단기의 토폴로지 연구 및 분석)

  • Go, Yu-Ran;Min, Myung-Hwan;An, Tae-Pung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.6
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    • pp.503-510
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    • 2020
  • The importance of DC breakers as key protection equipment is increasing in accordance with growing concerns on MVDC distribution network systems without DC/AC conversion. Different from the situation in AC systems, no natural zero-crossing point exists in DC systems. Thus, DC breaker technology is more difficult than AC breaker technology. The solutions for DC breakers can be divided into three types: mechanical, power electronics, and hybrid. In this study, the operating principles of several topologies of hybrid circuit breakers and that of the proposed DC breaker are analyzed and simulated by sorting two types. The breakers are compared in terms of the type and number of semiconductors, volume, power loss, auxiliary components, isolation, and other aspects. The advantages and disadvantages of the breakers are also analyzed.

Development and application for intelligent rail mobile system for monitoring the underground electric power facilities (지하구 상태감시 고도화를 위한 지능형궤도주행 이동 감시장치 개발적용)

  • Park, Soo-Shin;Kim, Tai-Ok;Choi, kyeong-Gyu;Kim, Sun-In;Bae, Tae-Woo
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.400-401
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    • 2015
  • It is brought up the electric power shortage for particular dense population areas. Due to this, the high quality economical and eco friendly electric power facilities are needed. Also, the inconvenience of maintenance is significantly increasing in case of power cut and black out. For avoiding power failure of underground electric power facilities, the precise preventive maintenance is compulsory but there are apparent limitations. In this paper, the intelligent rail mobile system is described to overcome the limitations.

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Renewable Power Generation Forecasting Method for Distribution System: A Review (배전시스템 운영계획을 위한 신재생에너지원 발전량 예측 방법)

  • Cho, Jintae;Kim, Hongjoo;Ryu, Hosung;Cho, Youngpyo
    • KEPCO Journal on Electric Power and Energy
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    • v.8 no.1
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    • pp.21-29
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    • 2022
  • Power generated from renewable energy has continuously increased recently. As the distributed generation begins to interconnect in the distribution system, an accurate generation forecasting has become important in efficient distribution planning. This paper explained method and current state of distributed power generation forecasting models. This paper presented selecting input and output variables for the forecasting model. In addition, this paper analyzed input variables and forecasting models that can use as mid-to long-term distributed power generation forecasting.

A Study on the Procedure of Fault on Electric Power Systems by Special Fibers (특수섬유에 의한 전력계통의 고장유발 과정 고찰)

  • Rim, One-Kwon;Kim, Seong-Shik;Jung, Dong-Hak
    • Journal of the Korea Institute of Military Science and Technology
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    • v.12 no.5
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    • pp.667-675
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    • 2009
  • Faults can be generated at electric power systems by variety of both certain and uncertain reasons, which may cause harmful effects on electrical apparatuses under operation and stability of electric power system operations, and may also lead to great confusions and inconveniences to individual livings, public works, industrial activities, services, military affairs, etc.. In some cases, intentional inductions of faults are committed for specific purposes, and it is necessary to understand the procedures of fault by some foreign materials. In this paper, compositions and operations of electric power systems, summaries of electrical fault phenomena and fault protection, and restrictions to power system operation were outlined. And the analogies on the procedure of faults from former papers were introduced, and test results that revealed the validity of those analogies were also introduced.

Development of Independent 1 kW-class PEMFC-Battery Hybrid System for a Building (건물용 독립형 1kW급 PEMFC-배터리 하이브리드 시스템 기술 개발)

  • Yang, Seug Ran;Kim, Jung Suk;Choi, Mi Hwa
    • KEPCO Journal on Electric Power and Energy
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    • v.5 no.2
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    • pp.113-120
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    • 2019
  • We have developed 1 kW-class PEMFC-battery hybrid system independently powering to the building, through the process of system design, current load characteristics analysis, power system configuration for demonstration site and performance evaluation. In order to use the fuel cell and battery as the hybrid type, a control technology for the charging/discharging decision and charging speed of the battery is required rather than using fuel cell. Also output power distribution between PEMFC and the battery is a core of energy management technology. It is confirmed that it is possible to supply independently 1kW powering the building to ensure optimal energy management through the power control experiment of the hybrid system.