• Electrical & Electronic Materials
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• v.5 no.1
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• pp.89-98
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• 1992

가스절연개폐장치에서 단로기의 조작시에 발생하는 과도과전압의 측정은 최적절연설계, 신뢰성 향상, 고장탐지 등에 있어 대단히 중요하다. 본 논문은 과도과전압과 시변전계의 정확한 측정이 가능한 용량성 전계센서에 관한 것으로 측정이론, 설계, 교정기술과 실규모 GIS실험장치에서의 과도과전압의 측정에 관한 모의 실험에 대하여 기술하였다. 시제작된 센서의 변환특성은 응답매개변수에 의하여 지배되어지며 센서와 측정계의 주파수대역폭은 수 Hz~ 약 200MHz정도이었다. 실규모 GIS실험장치에 적용하여 과도과전압을 측정한 결과 센서의 우수한 응답특성이 확인되었다.

• Electrical & Electronic Materials
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• v.6 no.3
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• pp.255-260
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• 1993

본 논문은 과도고전압 측정시스템의 단위계단응답으로부터 구한 보정계수를 사용하여 수치계산에 의해 출력값을 보정하는 방법에 대하여 기술하였다. 또한 실규모 용량성분압기의 분압비와 상승시간을 갖는 모의등가회로를 구성하여 측정한 바, 본 연구에서 제안된 보정방법은 급준파 및 차단파 등의 어떠한 입력에도 유용하게 사용할 수 있다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.11a
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• pp.281-284
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• 2005

This paper deals with the parametric analysis of electric and magnetic fields generated by lightning discharges. The measuring system consisted of the plate-type electric field and loop-type magnetic field sensor, the voltage follower, the active integrator and LabVIEW software. The parameters of the electric and magnetic field waveforms produced by intracloud lightning strokes were presented.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.11a
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• pp.261-263
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• 2005

This paper presents the potential interferences between various grounding electrodes. The ground potential rise and potential interference coefficient between grounding grid and ground rod were calculated. The potential rise and potential interference coefficient strongly depend on the distance between grounding electrodes.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1990.10a
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• pp.47-51
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• 1990

This paper deals with the electric field sensor. A capacitive voltage sensor is designed and manufactured for measuring the very fast transients generated by operating disconnection switch in GIS. It is certified that the voltage sensor has a good specific characteristic in high frequency domain and is able to measure the very fast transients included the harmonic components of 200[MHz].

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2283-2285
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• 2005

Electrical conduction in soils depends on the grain site, compactness, humidity and etc. When a high current is injected into the soil, and the breakdown phenomenon occurs and electrical behaviors in the vicinity of grounding electrodes may be changed. In the present work, electrical behaviors in the vicinity of ground rod due to the injection of impulse current were investigated. Spark-over phenomena at the tip of ground rod depend on the grain size and kinds of soils.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2003.11a
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• pp.373-376
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• 2003

A new method measuring soil resistivity in frequency range of 5-500[KHz] using variable frequency inverter was presented, and soil resistivity was analysed by resistive and reactive components on the basis of magnitude and phase of measured ground impedance. The test lead arrangement was proposed to reduce the inductive coupling in test circuit for measuring the soil resistivity. The frequency dependence of soil resistivity was mainly caused by the inductive current flowing through grounding conductors over the frequency of 70[KHz].

• Proceedings of the KIEE Conference
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• 2001.07c
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• pp.1718-1720
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• 2001

The route of surge arrester connection is very important because bends and kinds of leads increase the impedance to lightning surges and tend to nullify the effectiveness of a grounding electrode conductor. There is a need to know how effective installation of lightning surge arresters is made in order to control voltage and to absorb energy at high lightning currents. The effectiveness of a grounding conductor and bonding for 18[kV] metal oxide distribution line arresters was experimentally investigated with lightning and oscillating impulse voltages.

• Proceedings of the KIEE Conference
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• 1996.07c
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• pp.1882-1884
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• 1996

This paper deals with the lightning surge counter. In order to install the effective surge protective devices, it is important to find the parameters of incident surges. For the purpose of observing the occurrence frequency as a parameter of the amplitude of surge, two type surge counters were designed and fabricated. One is operated by surge currents, and the other is operated by surge voltages. The former consists of current sensor, metal oxide varister (MOV), rectifier, capacitor and electromagnetic counter. The latter consists of rectifier, voltage divider, comparator, photo coupler and counter circuit, and is useful for detecting the surge voltages.

• Proceedings of the KIEE Conference
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• 1996.07c
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• pp.1876-1878
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• 1996

This paper describes the combination surge generator for applying performance tests of surge protective devices. The $8/20{\mu}s$ waveform applies to low impedance circuits and components and is commonly used to determine the characteristics of surge protective devices. And the $1.2/50{\mu}s$ waveform applies to high impedance circuits and components and is used for testing dielectric behavior. Therefore, the combination surge generator, which generates $1.2/50{\mu}s$ voltage waveform under open-circuit conditions and $8/20{\mu}s$ current waveform under short-circuit condition, was proposed. Also this generator can produce $10/1000{\mu}s$ as well as $0.5{\mu}s/100kHz$ ring waveform.