• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.872-873
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• 2008

In this paper, a new type of switchgear, electro magnetic force driving actuator (EMFA), is developed and analyzed, applicable to high voltage gas circuit breaker (HGCB). Transient analysis is performed in order to obtain the dynamic characteristics of the EMFA. The distribution of static magnetic flux is obtained using the finite element method (FEM). The governing electric and kinematical equations are solved using the time difference method (TDM). Fabrication and experiments were performed in order to prove the applicability of HGCB for overall class. In comparing the experiment with simulated data, it is confirmed that analysis of the dynamic characteristics of EMFA is appropriate for design.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.980-981
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• 2008

Mechanical spring and hydraulic pressure operated mechanisms are applied in most of today's High Voltage Gas Insulated Switchgear(GIS)s. This paper proposes a new type of operation mechanism for GIS circuit breakers rated at 245kV and 40kA. The Motor-Direct-Drive-Mechanism (MDDM) has many advantages compared to conventional operating mechanisms. It has a very simple structure with only one moving part, low mechanical stress and audible noise. It also allows monitoring, operation speed control and self-diagnosis functions.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1364-1365
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• 2008

가스 절연 개폐장치(Gas Insulated Switchgear)의 고체 스페이서에 다양한 유전율 분포를 가진 경사기능성 재료(Functionally Graded Material)를 적용할 때, 전계의 완화를 예상할 수 있다. FGM 스페이서는 전계의 집중을 완화시킬 수 있고, 내부의 전계를 더 균일하게 분포시킬 수 있다. 본 연구에서는 유한요소법을 이용하여 상용 GIS의 FGM 스페이서에서 전계의 세기를 계산하였다. 계산 결과를 통해 스페이서의 유전율이 빠르게 변화하는 경우, 더 효율적으로 최대전계를 감소시켰고, 스페이서 내부의 전계를 균일하게 하였다. 결과적으로 FGM 스페이서는 단일 유전율을 가진 스페이서에 비해 절연 성능을 향상시킬 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.872-873
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• 2015

여러 전력기기를 안전성과 편의성 등을 위하여 함(enclosure)에 설치하였을 때, 이러한 제품을 배전반(Switchgear and controlgear assemblies)이라고 한다. 내부에 설치되는 기기들을 서로 접속할 때 전선(cable) 또는 부스바(busbar)를 사용하고 있는데, 사용시 필연적으로 전력손실에 의한 발열로 인하여 배전반 내부온도 및 기기의 온도가 상승한다. 기기에 대한 온도 상승 허용범위는 각 기기의 해당규격에 규정되어 있으며 배전반 규격(고압배전반 : IEC 62271-200 및 SPS-KEMC 2101-0609, 저압배전반 : IEC 61439 series 및 SPS-KEMC 2102-0610)에는 외부접속용 단자 등 배전반 내부에 사용되는 전선 또는 부스바의 온도상승 허용범위가 규정되어 있다. 본 고찰에서는 배전반의 각 정격전류에 따른 전선 또는 부스바의 사이즈, 특히 부스바의 사이즈 및 형상에 따른 온도상승의 영향을 살펴보고자 한다.

• 한국전기전자재료학회논문지
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• 제17권5호
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• pp.567-571
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• 2004

Recently, GIS(Gas Insulated Switchgear) has been recognizing of importance on development of diagnosis technique which is happened problem on confidence for a long time use. Therefore, the measurement and analysis of PD with prior phenomenon of insulation breakdown is used many method of diagnosis for GIS. In this paper, we simulate trouble condition in DS and analysis trouble signal to use electrical and mechanical methods, interpretation of detected signal has analysed with to use ø-q-n pattern and neural network. For this analysis, we have used the induction and AE(acoustic emission) sensors. For the simulation experiment, we make DS for 170 KV GIS and analyze the classification and characteristics of detected signals with the application of neural network algorithm.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 C
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• pp.1804-1806
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• 2002

KEPCO has a plan to operate 765kV electric power network from June, 2001, by the KEPCO's plan. We have developed the extra-high voltage class equipments for 765kV substation. Inpecial, we have proceeded the developments of 800kV Gas Insulated Switchgear from January 1998 to now. Until now we completed the test of a general characteric tests of GIS, the short-circuit test of GCB. DS. ES. HSGS.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.942-945
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• 2002

A garter spring, which is a long. special, close-coiled extension spring with its ends joined to form a ring, is used in connection between vacuum circuit breaker and bus bar in switchgear. To carry short-time current and resist welding at the contact surface in the connection, the garter spring must transmits an uniform contact force to the contact surface through the contact chips arranged in the circumference of bus bar. In this paper, the system for measurement of the contact force by the garter spring is developed. Using the developed measurement system, the design of the connection structure including the garter spring is reviewed to obtain the uniform contact forces in all of contact chips.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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• pp.403-405
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• 2001

This paper presents the detection method of partial discharge in metal clad switchgear(MCS) using electromagnetic technique. Two antennas are located in the inside and outside of the MCS, and electromagnetic waves detected by these antennas are analyzed and compared by FFT method in order to identify an insulation abnormality. As a result of the experiment by the proposed method, we show the detection possibility for partial discharge in the MCS. The proposed method is expected to apply to insulation condition observation and an accident prevention in the MCS effectively.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 추계학술대회 논문집 학회본부 C
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• pp.516-518
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• 2000

정상 상태의 gas-insulated switchgear (CIS) 내부에서 발생한 부분방전 신호를 검출 할 수 있는 UHF 부분방전 검출 센서를 실험용 362 kV GIS에 적용하였다. GIS 내부에 알루미늄 이물질을 투입한 다음 120 - 180 kVrms 전압을 단계적으로 인가하고 장시간 인가전압 위상에 대한 UHF 부분방전 신호를 측정하였다. 인가전압을 높일수록 검출된 방전신호의 간격이 늘어났으며, 이물질로 사용한 알루미늄선의 길이가 길어질수록 이물질의 상승고도는 증가하였다. GIS 내부에서 이물질의 운동에 대한 간단한 계산에서도 비슷한 경향을 보임을 확인하였다.

• Journal of Electrical Engineering and Technology
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• 제13권2호
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• pp.881-885
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• 2018

In order to develop a gas circuit breaker (GCB), the breaking performance of the short line fault (SLF) should be prioritized over that of the breaker terminal fault (BTF). In brief, it is necessary to evaluate the thermal characteristics of the insulating gas that is filled in a GCB. In the process of developing a GCB, many companies use the simplified synthetic testing facility (SSTF).In order to evaluate the SLF breaking performance of a GCB with a long minimum arcing time, a modifications to the conventional SSTF was proposed. In this study, we developed the SSTF with a modified transient recovery voltage circuit. The performance of the newly developed SSTF was verified by an $L_{90}$ breaking performance test on a rating combination of 170 kV, 50 kA, and 60 Hz.