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길경석,김명진,한주섭 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-
This paper describes with an effect of a single- and a quadruple- lightning impulse currents on electrical characteristics of ZnO blocks, and an expert system to diagnose deterioration of arresters. In this study, an accelerated deterioration test is carried out to deduce the parameters needed for diagnosing arrester deterioration, and leakage current components are measured. Also, wave height distribution of the leakage current with the progress of arrester deterioration is analyzed. From the experimental results, the wave height distribution of the leakage current showed a conspicuous difference even in an immaterial leakage current increase. The use of wave height distribution of the leakage current in deterioration diagnostic technique makes more accurate diagnosis than the conventional method using only a leakage current value. Finally, the expert system based on the experimental reslts is developed, and the effectiveness of the system is estimated in a 18[kV] lightning arrester.
길경석,손원진,송재용,김일권 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-
An objection of this study is to develop a measuring circuits and a analytic system for radioactive pulses. The proposed system consists of a pulse detection units for neutrons and gamma-rays, a programmable high voltage supply unit and a digital signal processor. Gamma-ray detection circuit can count pulse up to 10,000[pps]. The pulse detection parts consists of an active integrator, a pole-zero circuit, and a 3-stage amplifier of 60[dB], and its frequency bandwidth is from 37[Hz] to 300[kHz]. Also, pulse height distribution in accordance with pulse counts is important data in analyzing radioactive pulses. In this study, A/D converter (12[bit], 100[ns] and DSP [TMS 320C31-60) are used to analyze the pulse height, and the analytic system is designed to be operated in PC-base. Radioactive pulse has superior penetration ability to all kind of materials, and it is also possible to evaluate the soundness of electrical insulation materials by analyzing the pulse counts and/or pulse height distribution.
길경석,김일권,송재용 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-
This paper describes a technique that can predict electric fires by detecting a spark signal generated from operation of electric facilities. An electric fire lead a loss of life as well as huge property, therefore it is very important to predict an electric fire and eliminate the causes of it. Electrical spark which is ranked as majority causes of electric fires has a characterized frequency bandwidth distinguished from power frequency. In this experiment, various spark signals are simulated in a condition such as short circuit, flashover, and surface discharge. The results showed that the monitoring of spark signals can predict electric fires.
A Simulator for Potential Distribution Analysis
Gyung-Suk Kil,Hyong-Jun Gil,Dae-Won Park 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.2
This paper proposes a reduced-scale simulator that can replace numerical analytic methods for the estimation of potential distribution caused by ground faults in various grounding systems. The simulator consists of a hemispherical electrolytic tank, a three-dimensional potential probe, a grounding electrode, and a data acquisition module. The potential distribution is measured using a potentiometer with a position-tracing function when a test current flows to the grounding electrode. Using the simulator, we could clearly analyze the potential distribution for a reduced- scale model by one-eightieth of the buried depth and length of the grounding rod and grounding grid. Once both the shape of the grounding electrode and the fault current are known, the actual potential distribution can be estimated.
Study on a Partial Discharge Test for Low-Voltage Electronic Components
Gyung-Suk Kil,Dong-sik Kang,Don-ha Hwang,Jae-man Song,Jae-yong Song,Yong-ju Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
This paper deals with a partial discharge (PD) test on low-voltage electronic components, which is increasingly being accepted as a non-destructive and effective dielectric test. A comparative experiment, combined with the withstand voltage test (WVT) specified in IEC standards, was carried out on low-voltage insulation transformers. The results show that the insulation degradation of the sample progresses during the WVT. However, if an apparent charge of below 1 pC is detected, the PD test can be performed within the range of 30 . 50 % of the test voltage specified in the WVT. Therefore, the PD test can be applied successfully in place of the WVT as a non-destructive test on low-voltage electronic components.e6
A Simulator for Potential Distribution Analysis
Kil, Gyung-Suk,Gil, Hyong-Jun,Park, Dae-Won The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.2
This paper proposes a reduced-scale simulator that can replace numerical analytic methods for the estimation of potential distribution caused by ground faults in various grounding systems. The simulator consists of a hemispherical electrolytic tank, a three-dimensional potential probe, a grounding electrode, and a data acquisition module. The potential distribution is measured using a potentiometer with a position-tracing function when a test current flows to the grounding electrode. Using the simulator, we could clearly analyze the potential distribution for a reduced- scale model by one-eightieth of the buried depth and length of the grounding rod and grounding grid. Once both the shape of the grounding electrode and the fault current are known, the actual potential distribution can be estimated.
Measurement Method of the Resistive Leakage Current for Lightning Arrester Diagnosis
Kil, Gyung-Suk,Han, Ju-Seop,Song, Jae-Yong,Seo, Hwang-Dong The Korean Institute of Electrical and Electronic 2005 Transactions on Electrical and Electronic Material Vol.6 No.2
Several ways for monitoring the soundness of ZnO lightning arresters have been suggested, and all of which are based on the measurement of leakage current since it is well known that the resistive leakage current is a main indicator of arrester deterioration. In this paper, we proposed an algorithm to measure the resistive leakage current, which is quite different from the conventional method that eliminates capacitive current from the total leakage current. The proposed algorithm is based on that the magnitudes of the resistive leakage current are equal at the same applied voltage levels. To confirm the reliability of the algorithm, we fabricated a leakage current detector and designed an analysis program. Experimental results showed that the method does not need a complex circuitry and is useful to analyze the resistive leakage current.
길경석(Gyung-Suk Kil),지홍근(Hong-Keun Ji),박대원(Dae-Won Park),김일권(Il-Kwon Kim),김영일(Young-Il Kim),조영진(Young-Jin Cho) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.12
기존의 누진차단기는 병렬아크에 대해서 차단을 실패하거나 차단시간이 길어지는 결함이 있었다. 본 논문에서는 저압 옥내배선 계통에서 벙렬아크를 모의하여 기존 누진차단기의 차단특성을 분석하고, 병렬아크 검출에 적합한 공심형 잔류센서와 신호변환회로를 설계하여 기존 방식의 누천차단기에 적용하였다. 제안한 방식은 병렬아크의 발생위치와 관계없이 누전차단기를 동작시켰으며, 차단시간은 아크가 발생한 위상에 따라 1.74~8.3[ms]의 범위로 기존 차단기에 비해 약 5배 빠른 특성이다. Conventional Earth Leakage Circuit Breakers (ELCBs) have defects of a breaking failure or a long breaking-time against parallel arc current. In this paper, breaking characteristics of conventional ELCBs were analyzed by simulation of parallel arc in a low-voltage indoor wiring system, and an air-core current sensor and a signal converter being most available for parallel arc detection were developed and applied to a conventional ELCB. The proposed tripped the ELCB regardless of the location of parallel arc. The breaking-time was in ranges of 1.74~8.3[ms] depending on the phase of arc generation, which is about 5 times as fast as conventional ELCBs with the breaking-time of 50[ms].