• 제목/요약/키워드: ground resistance

검색결과 1,049건 처리시간 0.031초

고로슬래그 미분말 콘크리트의 공극구조가 동결융해 저항성능에 미치는 영향 (Effects of Pore Structure of Ground Granulated Blast-Furnace Slag Concrete on Freezing-Thawing Resistance)

  • 이보경;김규용;김래환;신경수;이준
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2014년도 춘계 학술논문 발표대회
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    • pp.284-285
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    • 2014
  • In this study, effects of pore structure of ground granulated blast-furnace slag concrete on freezing-thawing resistance are reviewed. As a result, degradation of freezing-thawing resistance performance was occurred as replacement ratio of ground granulated blast-furnace slag increases under same specified concrete strength condition. It is considered that pore structure of internal binder affects freezing-thawing resistance performance.

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변이율을 활용한 접지저항 측정 기술 (Ground Resistance Measurement Technology Utilizing the Variation Rate)

  • 이상무
    • 조명전기설비학회논문지
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    • 제19권3호
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    • pp.51-56
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    • 2005
  • 접지의 성능을 결정하는 기본 요소인 접지저항을 측정하는 것은 성능평가를 위한 중요한 기술이 된다. 접지저항의 정확한 측정을 위하여는 측정 환경상 고려하여야 할 주요한 변수들이 있는데 실제의 측정 현장에서 이러한 변수들을 알고 측정하기는 곤란한 것이 현실이다. 본 논문에서는 3점전위강하법상의 전류전극에 이르기까지 나타나는 전위차 특성 곡선에 대하여 측정 환경 변수의 특성을 내포하고 있는 변이율이라는 개념을 도입하여 미지의 측정 환경 변수중에서도 가능한 접지저항의 참값에 근접한 측정을 지향하는 방법을 제의한 것이다. 이 이론은 이미 기검증된 논문들의 결과 내용을 분석함으로써 귀납적인 결론을 유도한 것이다.

Analysis of behavioral characteristics of liquefaction of sand through repeated triaxial compression test and numerical analysis

  • Hyeok Seo;Daehyeon Kim
    • Geomechanics and Engineering
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    • 제38권2호
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    • pp.165-177
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    • 2024
  • Liquefaction phenomenon refers to a phenomenon in which excess pore water pressure occurs when a dynamic load such as an earthquake is rapidly applied to a loose sandy soil ground where the ground is saturated, and the ground loses effective stress and becomes liquid. The laboratory repetition test for liquefaction evaluation can be performed through a repeated triaxial compression test and a repeated shear test. In this regard, this study attempted to evaluate the effects of the relative density of sand on the liquefaction resistance strength according to particle size distribution using repeated triaxial compression tests, and additional experimental verification using numerical analysis was conducted to overcome the limitations of experimental equipment. As a result of the experiment, it was confirmed that the liquefaction resistance strength increased as the relative density increased regardless of the classification of soil, and the liquefaction resistance strength of the SP sample close to SW was quite high. As a result of numerical analysis, it was confirmed that the liquefaction resistance strength increased as the confining pressure increased under the same relative density, and the liquefaction resistance strength did not decrease below a certain limit even though the confining pressure was significantly reduced at a relatively low relative density. This is judged to be due to a change in confining pressure according to the depth of the ground. As a result of analyzing the liquefaction resistance strength according to the frequency range, it was confirmed that there was no significant difference from the laboratory experiment results in the basic range of 0.1 to 1.0 Hz.

고주파수 영역에서 심매설 접지전극의 접지임피던스 (Ground impedance of deeply driven rod in high frequency domain)

  • 이복희;이태형;이수봉;정현욱;정동철
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2004년도 학술대회 논문집
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    • pp.247-250
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    • 2004
  • A ground resistance is a good index of performance in a grounding system, but it does not reflect the performance in transient states. Recently long vertical ground rods in urban areas are often installed. But because of the inductance of long ground rods the ground impedance at high frequency might be greater than its resistance at low frequency. In this paper, a ground impedance of deeply driven ground rod has been measured in the frequency range from 10 kHz to 50 MHz. As a result, the ground impedances of a deeply driven ground rods are almost constant at the frequency range less than 100 kHz. However at high frequency the ground impedance showed the strong frequency dependance.

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보조전극의 위치에 따른 매설지선의 접지임피던스 측정정확도의 평가 (Evaluation of Measurement Accuracy of Ground Impedances in Counterpoise according to Location of Auxiliary Electrodes)

  • 이복희;최영철;최종혁;김동규;이규선;양순만;김태기
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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    • pp.352-355
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    • 2009
  • The ground resistance has been used as a method of estimating the capability of counterpoise. When transient currents blow through a ground electrode, it is reasonable to evaluate the performance of ground electrode system as a ground impedance instead of ground resistance. However, the measurement method of ground impedance for counterpoise is not clearly presented. This paper describes the measurement method of ground impedance considering the earth mutual resistances and AC mutual coupling. When we measure the ground impedance, the error due to earth mutual resistances depends on the distance between the auxiliary electrodes and the electrode under test. The measurement accuracy of high frequency ground impedance is mainly influenced by the location of the current electrode and the potential electrode.

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접지전류 측정에 의한 다중 접지계통의 접지저항 측정 (Measurement of Resistance of Multi-Grounded System by Ground Current Measurement)

  • 최종기;안용호;정길조;한병성;김경철
    • 대한전기학회논문지:전력기술부문A
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    • 제53권4호
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    • pp.234-237
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    • 2004
  • Measuring ground resistance has been a popular method of evaluation of the grounding electrode performance. If some portions of grounding electrodes are lost by corrosion, aging or other reasons, consequent deteriotation of the grounding performance would be resulted. It is one of the reasons why it is required to evaluate the performance of grounding systems regularly. However, in case of the electric facilities with multi-grounded system such as power substations with multi-grounded overhead ground wires and/or distribution line neutrals, it is practically difficult to disconnect neutrals or skywires from the substation grounding mesh for the ground resistance measurement. In this paper, a method for the grounding performance measurement of multi-grounded systems, which is based on the measuring ground current distributions, has been proposed. A field test results has shown the validity of the proposed test method.

접지전류 측정에 의한 다중 접지계통의 접지저항 측정 (Measurement of Resistance of Multi-Grounded System by Ground Current Measurement)

  • 최종기;안용호;정길조;한병성;김경철
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제53권4호
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    • pp.234-234
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    • 2004
  • Measuring ground resistance has been a popular method of evaluation of the grounding electrode performance. If some portions of grounding electrodes are lost by corrosion, aging or other reasons, consequent deteriotation of the grounding performance would be resulted. It is one of the reasons why it is required to evaluate the performance of grounding systems regularly. However, in case of the electric facilities with multi-grounded system such as power substations with multi-grounded overhead ground wires and/or distribution line neutrals, it is practically difficult to disconnect neutrals or skywires from the substation grounding mesh for the ground resistance measurement. In this paper, a method for the grounding performance measurement of multi-grounded systems, which is based on the measuring ground current distributions, has been proposed. A field test results has shown the validity of the proposed test method.

22.9kV-Y 다중접지 배전계통 접지극의 임펄스 응답 특성 실증연구 (A Study On the Impulse Response Behavior of Ground Rods in Power Distribution System)

  • 강문호;장상옥;박상만;하동혁;이흥호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 하계학술대회 논문집 C
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    • pp.1858-1860
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    • 2003
  • Ground rods as the discharge path are commonly installed to ensure the safety of human beings and facilities from the surge. Accordingly, proper grounding resistance are specified by the grounding types, and the specified resistance are also required to install the lightning protective facilities. it is needed to analyze the difference between these two resistance through the field test. Therefore, in this paper, the impulse response behavior of the ground rods is analyzed by constructing the test facilities and by testing the ground rods in multi-ground power distribution systems. The impulse responses were analyzed, in transient state, by testing the concrete poles as well since the grounding wires are installed in the concrete poles.

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Effects of Position of Auxiliary Probe on Ground Resistance Measurement Using Fall-of-Potential Method

  • Gil, Hyoung-Jun;Kim, Dong-Woo;Kim, Dong-Ook;Lee, Ki-Yeon;Kim, Hyang-Kon
    • International Journal of Safety
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    • 제7권2호
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    • pp.1-6
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    • 2008
  • In this paper, the effects of the position and the angle of the potential probes on the measurements of the ground resistance using the fall-of-potential method are described and the testing techniques for minimizing the measuring errors are proposed. The fall-of-potential method is theoretically based on the potential and current measuring principle and the measuring error is primarily caused by the position and angle of auxiliary probes. In order to analyze the relative error in the measured value of the ground resistance due to the position of the potential probe, the ground resistance was measured for the case in which the distance of the current probe was fixed at 50[m] and the distance of the potential probe was located from 10[m] to 50[m]. Also, the potential probe was located in turn at $30[^{\circ}]$, $45[^{\circ}]$, $60[^{\circ}]$, $90[^{\circ}]$, and $180[^{\circ}]$. As a consequence, relative error decreased with increasing distance of the potential probe and decreasing angle between the current probe and potential probe. The results could help to determine the position of the potential probe during the ground resistance measurement.

집재기계의 견인저항예측에 관한 연구 (A Study on Tractive Resistance Prediction of Logging machine)

  • 오재헌;차두송
    • Journal of Forest and Environmental Science
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    • 제17권1호
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    • pp.62-73
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    • 2001
  • 본 연구는 지면끌기집재에 사용되는 기계에 의해 견인되는 견인목의 견인저항을 예측하기 위해 견인목의 중량, 견인저항계수, 지면의 경사 등의 함수로 표현된 수학적 모델들을 개발하였다. 또한 만능재료시험기와 토양조를 이용한 실험실조건에서 4개 수종(잣나무, 일본잎갈나무, 신갈나무, 굴참나무)의 견인저항계수를 산출하였다. 산출한 견인저항계수와 가상 조건을 이용하여 개발된 3가지의 수학적 견인저항 모델에 적용하였다. 그 결과 견인목 중량에 대한 견인저항력의 비(T/Wt)는 지면의 경사가 증가할수록 전형적으로 증가하였으며, 반지면끌기집재가 지면끌기집재보다 견인저항력이 더 작게 나타났다. 본 연구의 결과는 집재작업기계의 선정과 집재윈치의 동력요구량 산정엔 기본적인 자료로 활용할 수 있을 것이다.

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