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이복희,길경석,주문노,이성헌 ( Bok Hee Lee,Gyung Suk Kil,Mun No Ju,Sung Heon Lee ) 한국센서학회 1996 센서학회지 Vol.5 No.3
This paper deals with the capacitive voltage divider which can measure a transient voltages generated by operating a high voltage impulse generator. The transient voltage measuring system using the capacitive electric field sensor consists of the planar-type electric field sensor having a fast response characteristic and the wide bandwidth voltage follower, and the input impedance of which is extremely high, about 10^(12)Ω. In order to analyze the response characteristics to a step input, the newly developed calibration method is proposed, and the error of voltage dividing ratio associated with set-up condition is investigated. Also the optimal set-up condition that is to be maintained within the range of 0.5 % is taken. From the calibration experiment, the frequency bandwidth of the transient voltage measuring system whose response time to a step input is about 15.8 ns, is from 6.37 Hz to 27.3 141Hz. Therefore it is possible to measure the commercial frequency voltages as well as the transient overvoltages without signal distortions.
우정민(Jeong Min Woo),주문노(Mun No Ju),강성만(Sung-Man Kang) 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.5
가공전선로에 의한 유도전압이 미치는 영향을 평가하기 위하여 장갑에 의한 접촉저항과 신발과 대지 간의 저항을 각각 변화시키면서 인체에 가해지는 유도전압과 전류를 측정하였다. 계산식을 통해 주요 파라미터를 추출하고, 해당 결과를 시뮬레이션 도구를 통해 비교하였다. 4 ㎸/m의 전기장에 노출되었을 때 인체와 대지 사이에 약 900 V의 유도전압이 발생하였고, 방전전류의 최대값과 지속시간은 장갑과 신발 저항의 변화에 따라 변화하였다. 또한 차폐선을 통한 유도전압 저감 효과를 확인하였다. The induced voltage and current were measured while changing the contact resistance of gloves and the resistance between the shoes and ground, respectively, to evaluate the human impact of the voltage induced by overhead power lines. The major parameters were extracted using a formula, and the results were compared using a simulation tool. When exposed to an electric field of 4㎸/m, an induced voltage between the human body and the ground of approximately 600 V was generated. The maximum value and duration of the discharge current varied according to the change in the gloves and shoe resistance. In addition, the induced voltage-reduction effect through the shielding wire was also confirmed.
±500㎸ HVDC 2회선 송전선로의 전기환경특성 예측 및 평가
우정민(Jeong Min Woo),주문노(Mun-No Ju),신구용(Koo Yong Shin),권구민(Gu Min Kwon),최우정(Woo Jung Choi),이재현(Jae Hyun Lee) 대한전기학회 2018 전기학회논문지 Vol.67 No.4
Since Korea has a small land area, it is expected to construct the conductor return type with neutral wire in the case of ± 500㎸ HVDC double bipole transmission line. Therefore, in order to apply ± 500㎸ HVDC double bipole transmission line with neutral wire in Korea, it is necessary to develop technology for insulation and environmental designs. In this study, radio interference, audible noise, electric field and ion current density according to the polarity arrangement were compared and assessed in the ± 500㎸ HVDC double bipole transmission line with the conductor return method. And the optimum configuration of HVDC double bipole transmission line was determined from the viewpoint of electrical environment.
765kV 송전선로용 특수 다중도체 방식의 코로나 잡음특성 및 전계분포 해석
민석원,김용준,신구용,이동일,주문노,양광호,Min, Seok-Won,Kim, Yong-Jun,Sin, Gu-Yong,Lee, Dong-Il,Ju, Mun-No,Yang, Gwang-Ho 대한전기학회 2001 전기학회논문지A Vol.50 No.12
To solve aeolian noise, we have tried several special conductor bundles equipped with spiral rod and one kind of low aeolian noise conductor with a special shape. Charge simulation method was applied to analyze electric field distributions of them in transmission line and corona cage for investigating the corona characteristics. This paper describes the electric field distributions and the performances of audible noise and radio interference from the special bundles in 765 kV transmission line by using corona characteristics obtained from corona cage simulation.
디지털 제어장치의 고출력 전자기펄스에 대한 취약성 사례 분석
우정민(Jeong Min Woo),주문노(Mun-No Ju),이홍식(Hong-Sik Lee),강성만(Sung-Man Kang),최승규(Seung-Kyu Choi),이재복(Jae-Bok Lee) 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.9
디지털 제어 시스템에서 주로 사용되는 설비인 PLC(Programmable Logic Controller)와 통신선로에 대한 HPEM(High Power Electromagnetic) 펄스의 노출 위험이 최근 증가되고 있다. 본 연구에서는 서로 다른 주파수 대역을 가지는 HPEM 발생장치를 이용하여 분리된 독립 객체로써 전자 장치의 HPEM에 대한 취약성을 평가하였다. 전자장치가 어떠한 영향을 받는지 상황별로 나누어 비교하였고, HPEM에 노출된 피 시험 기기의 취약성을 분석하였다. 피 시험 기기는 특정 이상의 HPEM에 노출되면, 제어 장치의 전압 및 통신 파형에 왜곡된 특성을 보였으며, UTP(Unshielded Twisted Pair) 케이블에 연결된 장치는 유도전압에 의해 작동 불량을 나타났다. 그러나 FTP(Foiled Twisted Pair) 케이블에 연결된 장치인 경우에는 HPEM 노출로부터 효율적으로 보호되었다. 따라서 현재 전력설비 및 산업현장에서 이용되고 있는 디지털 제어시스템에 대한 HPEM 노출 취약성과 보호대책의 필요성을 입증하였다. The risk of high power electromagnetic(HPEM) pulse exposure to the devices used in digital control system such as PLC(programmable logic controller) and communication cable is increasing. In this paper, two different frequency ranges HPEMs were exposed to those control systems to assess the each vulnerability. The vulnerability of the EUTs exposed from HPEM were analyzed and compared with a variation of distances and source power. As the EUTs were exposed to higher level of HPEM, the voltage and communication waveform of the control system had shown a distorted response. And the unshielded twisted pair(UTP) cable connected to the EUTs showed operation failures with induced voltage. However, the foiled twisted pair(FTP) cable shielded the connected device efficiently from the HPEM exposure. Therefore, the necessity of the protection measures against the vulnerability of HPEM exposure for the digital control system used in power facilities and industrial site were verified.