• 제목/요약/키워드: Discharges

검색결과 1,134건 처리시간 0.039초

유역모델 CAMEL 기반 식생여과대 모듈의 개발 (Development of a Vegetation Buffer Strip Module for a Distributed Watershed Model CAMEL)

  • 박민혜;조홍래;구본경
    • 환경영향평가
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    • 제24권5호
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    • pp.516-531
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    • 2015
  • 본 연구에서는 분포형 유역모델이면서, 국내 환경에 적합하도록 개발된 CAMEL에 기반하여 식생여과대 효과분석을 위한 모듈을 개발하였다. 식생여과대의 주요 모의기능은 기존의 CAMEL과 동의하나 릴에서의 유사포착 현상과 수평둔덕을 추가로 설계하여 모듈에 반영하였다. 식생여과대 모듈을 검증하기 위하여 시험 격자를 이용하여 식생여과대의 길이, 조도계수, 토성, 식생의 높이 및 뿌리 깊이 등 다양한 매개변수에 대한 민감도 분석을 실시하였다. 식생여과대 모듈의 민감도 분석결과를 종합해 보면, 유사 지표유출량은 조도계수 변화에 따라 민감하게 반응하였으며, 전반적으로는 유사와 TP의 지표유출량 저감률이 시나리오 변화에 상관없이 전반적으로 높은 것으로 분석되었다. TOC, TN의 저감률은 식생여과대의 길이, 토성변화에 따라 민감하게 반응하는 것으로 나타났으며, 유사와 TP의 지표유출량 저감률에 비해 상대적으로 저감률이 낮은 것으로 분석되었다. 본 연구에서 개발된 식생여과대 모듈은 환경변화에 따른 오염물질 저감효과를 합리적으로 재현하는 것으로 나타났으며, 향후 식생여과대 조성 지역에 적용되어 비점오염 물질 제거 효과를 정량적으로 산정하고 효율적인 관리방안을 평가하는데 기여할 것으로 기대된다.

뇌방전에 의한 유도전압과 자장의 측정 (Measurement of the Induced Voltages and Magnetic Fields Produced by Multiple Lightning Discharges)

  • 이복희;조성철;이우철;심응보;우정욱
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 하계학술대회 논문집 C
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    • pp.1866-1868
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    • 2004
  • This paper deals with the device for measuring the time-varying magnetic fields and induced voltages caused by lightning discharges. The system consists of two loop antennas for the measuring the magnetic flux density and induced voltages caused by the lightning current, an integrator a data acquisition and a personal computer with a software package that was developed for the analysis of the measurements.

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유중 부분방전에 의한 방사전자파의 측정 (Measurement of Electromagnetic Wave Generated by Partial Discharges in an Insulation Oil)

  • 박대원;이정윤;조향은;김민수;길경석
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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    • pp.1453-1458
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    • 2011
  • This paper dealt with the measurement and analysis of electromagnetic waves generated by partial discharges in insulation oil to develop insulation diagnostic techniques for power transformer. Two types of narrow-band monopole antennas with the resonant frequency of 500 MHz and 1 GHz were designed and fabricated. We simulated defects which consist of a needle electrode with curvature radius of 10 ${\mu}m$ and a plane electrode with diameter of 60 mm in insulation oil. From the experiment, the maximum output voltage of the fabricated antennas was measured; 620 $mV_{max}$ for 500 MHz resonant frequency and 920 $mV_{max}$ for 1 GHz resonant frequency.

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2개 센서를 이용한 부분방전 위치추정 기법 연구 (A Study on the Partial Discharge Location Method using 2 Sensors)

  • 김정태;김동욱
    • 전기학회논문지
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    • 제61권2호
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    • pp.251-256
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    • 2012
  • This study deals with the location of partial discharges(PDs) for power cables and GIS using 2 PD sensors and long coaxial signal cables. Throughout the experiments by use of simulated PD pulses and corona discharges in the power cable system, it is found out that the impedance matching between the coaxial signal cable and the measuring equipment should be done for good S/N ratio and the on-site measurement using more than 100m-long coaxial signal cable is possible. In addition, new PD location algorithm with the polarities of PD pulses and the arrival time difference between two pulses was proposed and was proved through the partial discharge experiments for the cable joint defect and artificial void defect.

전력케이블 접속재 XLPE/EPDM 계면의 부분방전 특성 (Partial Discharge Characteristics of the XLPE/EPDM Interface in Power Cable Joint)

  • 조경순;홍진웅
    • 한국전기전자재료학회논문지
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    • 제20권9호
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    • pp.780-786
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    • 2007
  • This paper describes the influence on partial discharge characteristics of defects at the model XLPE/EPDM interfaces of power cable joints. The defects of void and copper which could inadvertently be present at the joint interface. We measured ${\Phi}-n,\;{\Phi}-q$ patterns by a computer-aided partial discharge measuring system. Several parameters i, e, maximum discharge $q_{max}$ [pC], average discharge q [pC/cycle], and average angle of discharge ${\Theta}g$ [deg] were found to depend upon the defect type varying applied voltage. As the result of time evaluation, partial discharges are small different at copper defects, but is decreasing obviously about 20 minutes at void defect. It considered that difference of magnitude of total positive discharge of Q+ [pC] and total negative discharge of Q- [pC] is SPMD(swarming pulsive micro discharges).