• Proceedings of the KIEE Conference
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• 2004.05b
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• pp.113-116
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• 2004

We developed internal and external type sensor to measure ultra-high frequency (UHF) partial discharge (PD) in 170 kV gas-insulated switchgears (GIS). We also manufactured a PD-generator to verify and measure the detection sensitivity of those sensors. We measured the output power of the UHF PD sensors induced by PDs of 5 pC using the PD-generator. We measured UHF propagation loss of an 170 kV GIS for optimal arrangement of the sensors. We used swept UHF signal from a network analyzer into the GIS to measure the loss of various components of the GIS.

• Journal of the Korean Society of Safety
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• v.26 no.4
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• pp.41-46
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• 2011

The purpose of this paper is to analyze the causes of accidents related to the 3 phase 170 kV gas insulated switchgear of a power system collected from accident sites to secure data for the prevention of similar accidents and provide important points of view regarding diagnosis for the prevention of accidents involving gas insulated switchgears. The analysis results of the causes of accidents involving gas insulated switchgears showed deformation of the manipulation lever installed at the S-phase, disconnection of the insulation rod connection, melting of the upper conductor, a damaged tulip, damage to the lower spacer and the spacer at the breaker, etc. It is believed from this result that the potential for accidents has expanded due to accumulated energy as a result of repeated deterioration. The carbonization depth of a GIS was formed near the screw (T2, T3) used to secure the lower pole of the S-phase tulip. It is not known what has caused the screws to be extruded and melted. However, it is thought that an unbalanced electromagnetic force, micro-discharge, surface discharge, etc., have occurred at that point. In addition, even though 16 years have passed since its installation, there was no installation defect, act of arson, accidental fire, etc. General periodical inspection and diagnosis failed to find the factors causing the accidents. As a system contained in a closed metal container, it has a high risk factor. Therefore, it is necessary to design, install and operate a GIS in accordance with the standard operational procedure (SOP). In addition, it is necessary to apply conversion technology for periodical SF6 gas analysis and precision safety diagnosis. It is expected that tracking and managing these changes in characteristics by recording the results on the history card will provide a significant accident prevention effect.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1324-1325
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• 2008

근래 선진 중전기 메이커에서는 차단기, GIS 등의 전통적인 단품 위주에서 탈피하여 전력 IT 기술을 접목한 전력기기/변전소 자동화를 강력하게 추진하고 있다. 특히 전체 변전소를 감시, 제어, 계측, 보호할 수 있도록 전력 IT 기술을 기반으로 한 IEC 61850 적용 변전소 종합 자동화 시스템 개발에 역량을 집중하고 있다. 본 논문에서는 당사에서 개발한 최신 IT 기술을 적용한 IEC 61850 기반 170㎸ GIS용 Bay Controller 관련 구성, 기능, 성능시험 결과에 대해 기술하며, 변전소 내 노이즈로 인해 유발될 수 있는 전자장치 오동작 등을 보증하기 위해 실시한 전자파 장해시험 결과와 GIS와 동일한 환경에 설치되므로 온/습도, 진동/충격시험을 관련 국제규격인 IEC 60255-6, IEC 60255-21-1, 2, 3에 의거하여 실시한 내용을 기술하도록 한다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.896-897
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• 2007

산업사회의 발달과 정보통신의 발전 등으로 전송전압이 상승하고 도시의 인구 집중화 현상으로 전력설비의 대용량, 고전압으로 인해 가스절연개폐장치(GIS)의 사용도 증가하고 있다. 이에 따라 GIS를 구성하고 있는 중요부품 중의 하나인 절연스페이서의 사고도 증가하는 추세에 있어 한전 및 국외 사용자로부터 수명보증 등 신뢰성에 대한 공인 시험기관 성적서 또는 인증서가 요구되고 있다. 따라서 본 논문에서는 한전의 표준규격(ES 150-579)에 따른 신뢰성평가기준에 부합되는 냉열시험과 장기과전압시험을 실시하여 절연스페이서의 체계적인 수명평가를 실시하였다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.495-496
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• 2011

기존에 사용되고 있는 초고압 가스차단기(GCB : gas circuit breaker)는 대부분 퍼퍼형(puffer type) 소호방식의 가스 차단기를 사용하였다. 퍼퍼형 소호방식은 차단동작에 있어서 대단히 큰 조작력이 요구되고 소호부 size가 큰 단점을 가지고 있다. 이러한 문제를 해결하기 위해 아크 자체의 에너지를 아크 소호에 필요한 압력상승을 일으키는 데 이용하는 자력소호방식(self-extingishing type)에 작은 체적의 퍼퍼 실린더를 병용하는 복합소호방식(hybrid extingishing type) 차단부가 개발되어 사용이 확대되고 있다. 본 논문에서는 차단기의 소호방식별 특성을 비교 분석하고 최근 사용이 확대되고 있는 복합소호방식 차단기의 고장사례 분석을 통해 개선대책을 제시하였다.

• Proceedings of the KIEE Conference
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• 2002.11a
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• pp.19-21
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• 2002

Recently, it has become more competitive to take larger market share among domestic companies manufacturing high-power apparatus. Unfortunately, the size of total market in this field is being smaller than before because the business of transmission and distribution of electric power is being shifted from government control to private management. To save this situation, we are trying to develop new high-voltage Gas Insulated Switchgear for export such as 245kV GIS and 300kV GIS. It is very important to make GIS compact size to have international competitiveness against European companies. By reducing GIS's dimensions same as 170kV class, we expect to launch abroad successfully. Many factors should be considered to achieve good performance during short-circuit making-breaking. Analysis on cold gas flow is one method widely used to evaluate small-current interruption. Through this analysis, we can examine the dielectric characteristics at the weak points in the circuit-breaker. In this paper, we describe the results of cold-gas flow analyses on 245kV and 300kV circuit-breakers.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.6
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• pp.1083-1088
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• 2016

25.8kV GIS part generated by sensors to measure contact an inflow of noise depending on the extent of the measured discharge occurs often not easy. Partial discharge signal measurement sensor suitable for developing a more useful measurements at the scene to this, partial discharge waveform analysis developed a sensor, and to utilize forSensor on the development of the most important is VSWR decided to (voltage standing wave ratio) voltage standing-wave ratio less than 1.5 and decided less than at the full spectrum bands that are measured, this time Return loss, as measured value by absolute criteria 14.0 dB produced the sensor, designed to or more. UHF 1.5~0.5 GHz bandwidth spectrum to be measured in GIS. UHF bands were designed to be able to measure the best signal. Recently, 25.8kV GIS production company has been increasing variety of GIS were made open spacer in partial discharge in accordance with the not very easy to detect the signal. The sensor is designed height of four cm external spacer is attachment GIS in an influx of outside noise measurement, and be so manufactured as to facilitate the least we've done. Also, since partial discharge which occur can measure the frequency of the 170kV GIS external partial-discharge signals that occur at the scene of insulation applied to the spacer. Features, and also derived good results using global positioning. Also measured discharge point about sensors that are stable and the reliability of the development and local substation equipment failure occurring signal analysis through the discharge for the prevention of widely. There should be to believe that used.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.687-688
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• 2015

기존의 Porcelain Bushing은 기계적 성능이 약하여 작은 충격에도 손상이나 파손 등이 발생되며 오손에 의한 전기적 성능의 저하로 오염이 심한지역에서의 사용이 제한되며 정기적으로 세정등 유지보수가 필요하다. 이러한 문제점을 보완하기 위해 절연성능 및 내 오손 특성이 우수한 Composite Bushing으로 바뀌고 있는 추세이다. 당사에서는 최근에 170kV GIS용 Composite Bushing 인증을 완료하였으며 본 논문에서는 362kV급 GIS용 Composite Bushing에 대한 개발 내용을 기술하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.11a
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• pp.679-682
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• 2004

GIS equipment has problems on confidence according to long-time usage, development of diagnosis technique has been importantly recognized accordingly. Therefore. measurement and analysis of PD has been generally used much equipment of GIS. But, in case of measurement of PD at field, real trouble signals are difficult to classify noise. Accordingly, a variety of trouble conditions for DS were simulated, and detected signals were analyzed by the application of electrical and mechanical methods. For this analysis, detected signals were accumulated according to phase-magnitude with the application of Induction sensor, and then we analyzed the characteristics. For the simulation experiment, we made DS for 170kV GIS and analyzed the characteristics of detected signals with the application of neural network algorithm.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.07b
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• pp.1207-1210
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• 2004

Recently, because GIS equipment has problems on confidence according to long-time usage, development of diagnosis technique has been importantly recognized. Therefore. measurement and analysis of PD has been generally used much equipment of GIS. But, in case of measurement of PD at field, real trouble signals are difficult to classify noise. Accordingly, a variety of trouble conditions for DS were simulated, and detected signals were analyzed by the application of electrical and mechanical methods. For this analysis, detected signals were accumulated according to phase-magnitude with the application of Induction sensor, and then we analyzed the characteristics. For the simulation experiment, we made DS for 170kV GIS and analyzed the characteristics of detected singals with the application of neural network algorithm