• Title, Summary, Keyword: electric potential

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The Analysis on the Electric Potential Distribution of Dry and Submerged Condition by Electric Leakage in Street Lamp (가로등설비 누전시 건조상태와 침수상태에 대한 전위분포 분석)

  • Hon, Sung-Ho;Park, Sang-Tea;Kim, Sang-Chul
    • Journal of the Korean Society of Safety
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    • v.23 no.6
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    • pp.44-50
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    • 2008
  • This paper presents study on the electric potential distribution when have a short in street lamp. In order to measure electric potential testing ground is built in. A experiment is conducted to simulate dry and submerged situation of street lamp. The street lamp is leaked by artificial means. And electric potential is measured in grounded street lamp and street lamp alone. The results show that touch voltage of grounded street lamp is possible more high than street lamp alone. And the electric shock hazard is high because high electric potential is distributed near submerged street lamp. Also if street lamp is submerged ground is not useful to decrease electric shock hazard.

Development of Leakage Detector for Electric Equipment Failure in Fountain (분수대에서의 전기설비 고장에 대한 누전 감지 장치 개발)

  • Kim, Doo-Hyun;Kim, Sung-Chul;Park, Jong-Young
    • Journal of the Korean Society of Safety
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    • v.33 no.1
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    • pp.35-40
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    • 2018
  • This research aimed to develop an leakage detector of analyzing the electric potential generated from the electric leakage of electric equipment of the fountain. To accomplish this goal, the potential gradient was analyzed against path 1 ~ path 4; this was done by taking the lighting of a fountain as the electric leakage point based on code analyses in Korea and other countries. Lighting 1 was taken as the electric leakage point, and the earthing point was set against lightings(2~3). It appeared that the allowable touch voltage against the 1 type(under 2.5 V) exceeded 60.0%. Therefore, the lighting of fountain turned out to be the most dangerous point, and electric shock could be formed by the electric leakage of electric equipment in underwater as well as by the lighting. An leakage detector was developed based on this risk; this detector is capable of analyzing the electric potential of a electric equipments of the fountain in underwater. Then, a verification test was carried out. This leakage detector can be used to measure electric potential in various submerged areas such as swimming pools, flooded spaces, and fountains.

The Experimental Study on the Electric Potential Distribution by Electric Leakage in Street Lamp (가로등설비 누전시 전위분포에 대한 실험연구)

  • Park, Sang-Tae;Lee, Bok-Young;Hong, Sung-Ho;Choi, Chung-Suk;Gil, Hyung-Jun;Han, Woon-Ki
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.222-227
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    • 2005
  • This paper presents study on the electric potential distribution when have a short in skeet lamp. In order to measure electric potential testing ground is built in. A experiment is conducted to simulate dry and submerged situation of street lamp. The street lamp is leaked by artificial means. And electric potential is measured in grounded street lamp and street lamp alone. The results show that touch voltage of grounded street lamp is possible to more high than street lamp alone. And the electric shock hazard is high because high electric potential is distributed near submerged street lamp. Also if street lamp is submerged ground is not useful to decrease electric shock hazard.

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Differences in Electric Potential of Meridian System(3) - Analysis of Electrical Potentials in Arrhythmic Patients - (12경맥 전위측정 실험에 대한 연구(3) -부정맥 환자의 측정전위 비교-)

  • Nam, Bong-Hyun;Choi, Hwan-Soo
    • Journal of Acupuncture Research
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    • v.17 no.4
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    • pp.172-179
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    • 2000
  • Objectives : Assuming that the characteristic of meridian system has been similar to this of electric potentials in human body and that measurements of electric potential at well(井穴) and sea(合穴) points in branches of the twelve meridians will be representative of measurements of the twelve meridians, to measure the electric potentials in three patient groups with arrhythmia(AP group), with arrhythmia and cerebral infarction(CI group), and with arrhythmia and hemorrhage(CH group), and then to find out the characteristic of meridian system among 3 groups. Methods : Thirty arrhythmic patients diagnosed by EKG, CT, and deficiency of the heart blood(心血虛症) were divided into 3 groups(AP, CI, CH group). Their electric potential of well and sea points in the meridians were measured 3 times by physiograph. Results : Measurements were analyzed by statistical factor analysis, we obtained that the left side electric potential of well and sea points in branches of the twelves meridians in AP group was divided into two factors, which were the hand meridian without the lung meridian, the foot meridian and the lung meridian, but the right side electric potential was divided into the hand and the foot meridian. In CH group both the left and the right side electric potential was divided into three factors. In CI group the left side electric potential was divided into three factors, but the right side electric potential was divided into two factors. Conclusions : In conclusion, their electrical potentials were different each other among 3 groups. Thus electrical potentials of well and sea points might be the representative meridian to show their characteristics.

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Stress and Electric Potential Fields in Piezoelectric Smart Spheres

  • Ghorbanpour, A.;Golabi, S.;Saadatfar, M.
    • Journal of Mechanical Science and Technology
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    • v.20 no.11
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    • pp.1920-1933
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    • 2006
  • Piezoelectric materials produce an electric field by deformation, and deform when subjected to an electric field. The coupling nature of piezoelectric materials has acquired wide applications in electric-mechanical and electric devices, including electric-mechanical actuators, sensors and structures. In this paper, a hollow sphere composed of a radially polarized spherically anisotropic piezoelectric material, e.g., PZT_5 or (Pb) (CoW) $TiO_3$ under internal or external uniform pressure and a constant potential difference between its inner and outer surfaces or combination of these loadings has been studied. Electrodes attached to the inner and outer surfaces of the sphere induce the potential difference. The governing equilibrium equations in radially polarized form are shown to reduce to a coupled system of second-order ordinary differential equations for the radial displacement and electric potential field. These differential equations are solved analytically for seven different sets of boundary conditions. The stress and the electric potential distributions in the sphere are discussed in detail for two piezoceramics, namely PZT _5 and (Pb) (CoW) $TiO_3$. It is shown that the hoop stresses in hollow sphere composed of these materials can be made virtually uniform across the thickness of the sphere by applying an appropriate set of boundary conditions.

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.

Significance Test for Electric Potential of Meridian System - Between hand and foot meridian, yin and yang meridian, exterior and interior of the body, and among the five elements - (정상인의 12경맥 측정전위에 대한 유의성 분석 - 고전경락이론의 수족 . 음양 . 장부의 표리와 오행 . 육기의 표리와 오행을 중심으로 -)

  • Choi, Hwan-Soo;Nam, Bong-Hyun
    • Korean Journal of Oriental Medicine
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    • v.6 no.1
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    • pp.69-80
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    • 2000
  • Objectives : Assuming that the characteristic of meridian system has been similar to this of electric potentials in human body and that measurements of electric potential at well(井穴) and sea(合穴) points in branches of the twelves meridians will be representative of measurements of the twelve meridians, to measure the electric potentials in twenty healthy volunteers when they were sleeping or waking respectively, to do significance test for electric potential of meridian system between hand and foot meridian, yin and yang meridian, exterior and interior of the body, and among the five elements. Methods : When twenty healthy volunteers were sleeping, their electric potentials of well and sea points in branches of the twelve meridians were simultaneously measured by physiograph. After a minute we measured them again, totally 5 times. And then when they were waking, their electric potentials were measured 5 times by the above method. Results : Measurements were analyzed by statistical t-test, we obtained that the left side electric potential of hand or yin meridian was significantly different from that of foot or yang meridian both sleeping and waking. The right side of electric potential was the same result as the left side's. Most of the t-test was significant between exterior and interior of the body, and among the five elements. That meaned that it was partly possible to apply the ancient theory of meridians to the study of electric potential at well and sea points in branches of the twelves meridians.

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Biophysical Characteristics of Meridian System with Two Pain Diseases (통증에 따른 경락의 생체 물리적 정보 분석 연구)

  • Kaptchuk, Ted J.;Nam, Bong-Hyun
    • Korean Journal of Acupuncture
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    • v.22 no.4
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    • pp.29-41
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    • 2005
  • Objectives : Although previous anatomic, physiological and biophysics studies have examined the acupuncture meridian system, much remains unclear and controversial. This study was undertaken to examine electrical potential aspects of the meridian system. Electric potential was measured at the well and sea acupoints on the twelve acupuncture meridians (AM), on forty patients half with loin lesions, and pain of loin and lower extremities(LL) and half with shoulder lesions, and aching of shoulder and arm(SA). The object was to determine to what extent electric potential is an important risk factor between LL and SA. Methods : At the left and the right side with each of twenty LL and twenty SA patients, physiograph was used to measure electric potentials of AM ten sessions. T-test was used to compare the mean of electric potential between the two different pain groups and multiple logistic regression was used to analyze the risk of the 24 electric potentials measured. Results and Conclusions : In the LL, the only electric potential that was statistically significantly greater than SA was the bladder meridian on the left side. On the contrary, electric potentials in SA, which includes the large intestine, pericardium, triple burner, spleen, stomach, kidney and gallbladder meridians, were statistically larger than those of LL at the same side. On the right side, the five kinds of electric potentials(lung, large intestine, small intestine, pericardium and gallbladder meridian) of LL were statistically larger than those of SA. On the triple burner, stomach and kidney meridians electric potentials of SA were larger than those in LL. After adjusting for 24 electric potentials, pain risk factors, and different illness categories, multiple stepwise selection logistic regression modeling, resulted in the final selection of a total of 13 statistically significant electric potentials. These were 7 electric potentials at left side - small intestine, triple burner, spleen, stomach, bladder, liver and gallbladder meridian, and 6 at rght side - lung, large intestine, heart, pericardium, kidney and bladder meridian.

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A Comparison of Electrical Stimulation for Electrodic and EDTA-Enhanced Phytoremediation of Lead using Indian Mustard (Brassica juncea)

  • Lim, Jae-Min;Jin, Biao;Butcher, David J.
    • Bulletin of the Korean Chemical Society
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    • v.33 no.8
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    • pp.2737-2740
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    • 2012
  • The use of plants to remove toxic metals from soil (phytoremediation) is emerging as a cost-effective alternative to conventional methods for the removal of heavy metals from contaminated soil. Indian mustard (Brassica juncea) was used as the plant to accumulate high tissue concentrations of lead when grown in contaminated soil. For this study, the application of an electric field combined effectively with EDTA-enhanced phytoremediation. A stimulation of direct and alternating electric potential was compared and EDTA-enhanced phytoremediation of lead using Indian mustard has been performed. The effects of experimental parameters such as operating voltage with different concentration of EDTA, the number of graphite electrodes, and cultivation period on the removal of toxic metal were studied. Shoot lead accumulations in Indian mustard increased as the concentration of EDTA and dc electric potential was increased. Two to four folds was increased when EDTA plus a dc electric potential was applied, compared to an ac electric potential. The maximum lead accumulation in the shoots was achieved by applying EDTA plus dc electric potential with 6 graphite electrodes.

The Usability of Zinc Electrode using Wireless Measuring System of Electric Potential (무선전위측정시스템에 사용하는 아연전극 활용성 검토)

  • Lee, Jong-Rark;Leem, Sa-Hawn;Kim, Sang-O
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.177-180
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    • 2006
  • This study is to make a basic study if solid zinc (Zn) can be used for buried reference electrode, so we examined the adequacy of zinc as reference electrode by using zinc which showed regular electrode for buried period. The deference of electric potential if zinc electrode for corrosion factor such as soil resistivity or pH didn't show fixed trend and there was no clear trend on the change of measurement period. From field test, it is known that the natural electric potential difference of CSE electrode and zinc electrode is 1,100mV, but the electric potential of zinc electrode for CSE electrode in the natural soil and copying soil was 1,094~1,158mV. There was no fixed trend on the change of measurement period and electric potential difference of zinc electrode for corrosion factors such as soil resistivity or pH. Consequently, there was 40~60mV of electric potential difference in every copying soil during the experiment measurement.

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