• Title/Summary/Keyword: Leakage characteristics

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Electrical Characteristics of ZnO Blocks by a Lightning Impulse Current and the Expert System to Diagnose Arrester Deterioration (뇌충격전류에 의한 산화아연형 피뢰기 소자의 전기적 특성과 피뢰기 열화진단 전문가 시스템)

  • Gil, Gyeong-Seok;Han, Ju-Seop;Song, Jae-Yong;Kim, Myeong-Jin;Kim, Jeong-Bae;Jo, Han-Gu
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.51 no.4
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    • pp.152-157
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    • 2002
  • This paper describes an effect of a single- and a quadruple-lightning impulse currents on electrical characteristics of ZnO blocks, and an expert system to diagnose arrestor deterioration. To deduce the parameters needed for diagnosing arrester deterioration, an accelerate deterioration teat is carried out. In the experiment, leakage current components are measured. Also, wave height distribution of the leakage current according to the progress of arrester deterioration is analyzed. From the experimental results, the wave height distribution of the leakage current showed conspicuous difference even in an immaterial leakage current increase. Therefore, the use of wave height distribution of the leakage current in deterioration diagnostic technique makes more accurate diagnosis than the conventional method by using only a leakage currant value. Finally, the expert system based on the experimental results is developed and the system can diagnose arrestor deterioration by measuring the leakage current and its wade height distribution.

Self-healing and leakage performance of cracks in the wall of a reinforced concrete water tank

  • Gao, Lin;Wang, Mingzhen;Guo, Endong;Sun, Yazhen
    • Earthquakes and Structures
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    • v.16 no.6
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    • pp.727-741
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    • 2019
  • A reinforced concrete water tank is a typical functional liquid storage structure and cracks are the greatest threat to the liquid storage structure. Tanks are readily cracked due to seismic activity, thereby leading to the leakage of the stored liquid and a loss of function. In order to study the effect of cracks on liquid storage tanks, self-healing and leakage tests for bending cracks and through cracks in the walls of a reinforced concrete water tank were conducted. Material performance tests were also performed. The self-healing performance of bending cracks in a lentic environment and through cracks in a lotic environment were tested, thereby the self-healing width of bending micro-cracks in the lentic environment in the short term were determined. The through cracks had the capacity for self-healing in the lotic environment was found. The leakage characteristics of the bending cracks and through cracks were tested with the actual water head on the crack. The effects on liquid leakage of the width of bending cracks, the depth of the compression zone, and the acting head were determined. The relationships between the leakage rate and time with the height of the water head were analyzed. Based on the tests, the relationships between the crack characteristics and self-healing as well as the leakage were obtained. Thereby the references for water tank structure design and grading earthquake damage were provided.

A Study on the characteristics of degradation sensor for insulation oil (절연유(絶緣油) 열화(劣化)센서 특성(特性) 연구(硏究))

  • Chon, Y.K.;Sun, J.H.;Kang, D.S.;Joo, B.S.;Yoon, J.Y.;Chung, S.J.
    • Proceedings of the KIEE Conference
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    • 1995.07c
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    • pp.1371-1374
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    • 1995
  • It is well known that the degradation of transformer oil conseqently lead to the failure of transformer. This paper discussed the characteristics of the degradation sensor checking transformer oil condition in live line. The degadation sensor is composed of base ring, electrodes and porous ceramic, passed through the transformer oil and checks the transformer oil condition through sensor's leakage current. So it is important to minimize the leakage current of base ring and connection parts. To investigate the leakage current of base ring and connection parts the characteristics of V-T-I and DC 2 KV and other examinations were performed. It is verified that ionized transformer oil caused by the expansion of temperature increases in the leakage current of porous ceramic sensor. It is certification that the leakage current of other parts of porous ceramic is very small(about 2%) compared with the porous ceramic body and it is confirmed that the leakage current in porous ceramic is changed sensitively according to the new oil(NO) and and the degradation oil(DO).

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Detection of Personal Information Leakage using the Network Traffic Characteristics (네트워크 트래픽 특성을 이용한 개인정보유출 탐지기법)

  • Park, Jung-Min;Kim, Eun-Kyung;Jung, Yu-Kyung;Chae, Ki-Joon;Na, Jung-Chan
    • The KIPS Transactions:PartC
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    • v.14C no.3 s.113
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    • pp.199-208
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    • 2007
  • In a ubiquitous network environment, detecting the leakage of personal information is very important. The leakage of personal information might cause severe problem such as impersonation, cyber criminal and personal privacy violation. In this paper, we have proposed a detection method of personal information leakage based on network traffic characteristics. The experimental results indicate that the traffic character of a real campus network shows the self-similarity and Proposed method can detect the anomaly of leakage of personal information by malicious code.

A study on the characteristics of degradation sensor for transformer insulation oil (변압기(變壓器) 절연유(絶緣油) 열화(劣化)센서의 특성연구(特性硏究))

  • Chon, Y.K.;Sun, J.H.;Kang, D.S.;Kim, M.D.;Kweon, D.J.
    • Proceedings of the KIEE Conference
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    • 1996.07c
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    • pp.1765-1768
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    • 1996
  • It is well known that the degradation transformer oil is mainly effected to the failure of transformer. In this paper it is discussed the characteristics of the degradation sensor checking transformer oil condition in live line. The degadation sensor composed with base ring, electrodes and porous ceramic passed through the transformer oil and checked the transformer oil condition with sensor's leakage current. It is important to minimize the leakage current of base ring and connection parts. To investigate the leakage current of base ring and connection parts it is examined the characteristics of V-T-I and DC 2 KV and other examinations. It is verified that ionized transformer caused by the expansion of oil temperature increase in the leakage current of porous ceramic sensor. It is certificated that the leakage current of other parts of porous ceramic is very small (about 2 %) than the porous ceramic and it is confirmed that the leakage current in porous ceramic is changed sensitively according to the new oil(NO) and and the degradation oil(DO).

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Effect of Leakage on the Noise Reduction Characteristics of Helmholtz Resonator (누출이 헬름홀츠 공명기의 소음저감 특성에 미치는 영향)

  • Lee, Il-Jae
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.6
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    • pp.634-640
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    • 2009
  • Helmholtz resonator has been used, especially in intake and exhaust systems of vehicles, due to its good noise reduction characteristics at low frequencies. Many approaches have been developed to predict the acoustic behavior of the resonator with the assumption that there is no leakage from the resonator. However, its behavior may be affected by leakage which may exist in manufacturing processes or on purpose. This study investigates the effect of leakage on the noise reduction characteristics of Helmholtz resonator with two practical examples. One is a resonator with a gap between baffle and housing of the resonator and the other one is a resonator with two drain holes on the baffle. The measured transmission loss shows that the resonance frequencies are considerably shifted to higher frequency due to the leakage. The Boundary Element Method was applied to predict the transmission loss of the Helmholtz resonator with drain holes. The comparison between the measured and predicted transmission loss shows that the acoustic impedance of the holes is essential for accurate predictions of the transmission loss.

Electrical Leakage Levels Estimated from Luminescence and Photovoltaic Properties under Photoexcitation for GaN-based Light-emitting Diodes

  • Kim, Jongseok;Kim, HyungTae;Kim, Seungtaek;Choi, Won-Jin;Jung, Hyundon
    • Current Optics and Photonics
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    • v.3 no.6
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    • pp.516-521
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    • 2019
  • The electrical leakage levels of GaN-based light-emitting diodes (LEDs) containing leakage paths are estimated using photoluminescence (PL) and photovoltaic properties under photoexcitation conditions. The PL intensity and open-circuit voltage (VOC) decrease because of carrier leakages depending on photoexcitation conditions when compared with reference values for typical LED chips without leakage paths. Changes of photovoltage-photocurrent characteristics and PL intensity due to carrier leakage are employed to assess the leakage current levels of LEDs with leakage paths. The current corresponding to the reduced VOC of an LED with leakage from the photovoltaic curve of a reference LED without leakage is matched with the leakage current calculated using the PL intensity reduction ratio and short-circuit current of the LED with leakage. The current needed to increase the voltage for an LED with a leakage under photoexcitation from VOC of the LED up to VOC of a reference LED without a leakage is identical to the additional current needed for optical turn-on of the LED with a leakage. The leakage current level estimated using the PL and photovoltaic properties under photoexcitation is consistent with the leakage level measured from the voltage-current characteristic obtained under current injection conditions.

Design Effect of Sealing Characteristics of Non-Contact Type Seal for High Speed Spindle (형상설계에 관한 고속주축용 비접촉 시일의 밀봉특성 연구)

  • 나병철;전경진;한동철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.610-614
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    • 1996
  • Sealing of lubricat-air mixture in the high performance machining conte is one of most the important characteristics to carry out enhanced lubrication. High speed spindle requires non-contact type of sealing mechanism. Evaluating an optimum seal design to minimize leakage is concerned in the aspect of flow control. Effect of geometry and leakage path are evaluated according to variation of sealing geometry, Velocity, pressure, turbulence intensity of profile is calculated to fina more efficient geometry and variables. This offers a methodological way of enhancement seal design for high speed spindle. The working fluid is regarded as two phases that are mixed flow of oil phase and air phase. It is more reasonable to simulate an oil jet or oil mist type high speed spindle lubrication. Turbulence and compressible flow model are used to evaluate a flow characteristic, This paper arranges a geometry of mostly used non-contact type seal and analyzes leakage characteristics to minimize a leakage on the same sealing area.

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Evaluation of Corrosion Characteristics on Welding Part of Leakage Water Pipe by Underwater Welding Electrode (수중용접봉으로 용접한 누수 배관 용접부위의 부식 특성 평가)

  • Kim, Jin-Gyeong;Moon, Kyung-Man
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2006.06a
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    • pp.93-94
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    • 2006
  • The repair welding of small leakage parts on the water pipeline in engine room is often and important factor in standby and emergency condition in a ship. So, the purpose of this study is to evaluate the corrosion characteristics of welding part of leakage water pipe in case of some underwater welding electrodes. The corrosion current density between welding metal and base metal was considerably different according to used underwater welding electrodes. In case of DC welding, its corrosion characteristics was better than that of AC welding.

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Hydrostatic Bearing Characteristics of Slipper in Piston Pump . Motor (액셜 피스톤 펌프 . 모터의 피스톤 구면부 정압 윤활특성)

  • 박경민;김종기;오석형;송규근;정재연
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2001.11a
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    • pp.186-193
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    • 2001
  • In the high pressure state, the leakage flow rate of hydraulics is one of serious problems and the great reason to decrease the volume efficiency. In this paper, I tried to clarify tribology characteristics for the slipper hydrostatic bearing in swash plate type axial piston pumps and motors by means of experiment . I measured the leakage flow rate between swash plate and piston shoe with change the supply pressure and oil temperature at a swash plate angle of 0。 . And I also investigated the slipper pocket pressure and calculated oil film thickness for theoretical method. So. 1 have analyzed the tribology characteristics of hydrostatic bearing for leakage flow rate and oil film thickness with oil temperature and supply pressure.

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