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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,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,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.
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.
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.
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
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.
길경석(Gyung-Suk Kil),박대원(Dae-Won Park),김일권(Il-Kwon Kim),최수연(Su-Yeon Choi),안창환(Chang-Hwan Ahn),이영근(Young-Kun Lee) 한국조명·전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.10
뇌경보시스템은 낙뢰에 의한 인적 물적 피해를 예방하는 중요한 장치이다. 본 논문에서는 뇌경보시스템의 주요 기능으로 뇌운의 이동과 활동을 감시할 수 있는 뇌방전 위치표정 알고리즘 및 회로에 대해 연구하였다. 뇌방전시 발생하는 전계성분은 Whip 안테나와 공진주파수 300(㎑)의 협대역 공진증폭기로 검출한다. 자계파형 측정회로는 직교루프코일과 적분증폭기로 구성되며 주파수 대역은 5[㎑] ~l.2[㎒]이다. 전계파형으로 뇌방전의 극성을 판별하고, 자계파형의 크기와 영점교차점에 의해 방향과 거리를 산출하여 뇌방전의 위치를 표정한다. Lightning warning system plays an important role in protecting human life and other facilities from lightning return strokes. This paper dealt with lightning positioning algorithms and circuits as a main function of lightning warning system, which monitor movements and activities of thunderclouds. Electric field component produced by lightning discharge is detected by the configuration of a whip antenna and a narrow-band resonance amplifier with center frequency of 3OO[㎑]. Measurement circuit of magnetic field waveform consists of a crossed-loop coil and an integral amplifier, and its frequency bandwidth is ranges from 5[㎑] to 1.2[㎒]. The polarity of lightning discharge is discriminated by electric field component After fixing the polarity, we can calculate the direction and distance of lightning discharge by the peak and the zero-cross time of magnetic field waveform.