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22.9㎸ NGR 상용주파 자계발생장치 구축 및 모의 해석
임윤석(Yun-Seog Lim),이상윤(Sang-Yun Lee),서인진(In-Jin Seo) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
The 22.9㎸ neutral ground reactor(NGR) which is connected the secondary neutral line of 154㎸ main transformer is used for protecting electric facilities and security of life. This paper presents installation of 22.9㎸ NGR magnetic field generator and comparable result between magnetic field measurement and simulation in order to reduce magnetic field around NGR effectively.
초고압애자의 ESDD 및 NSDD 측정을 통한 내환경 특성 연구
이상윤(Sang-Yun Lee),임윤석(Yun-Seog Lim),이원교(Won-Kyo Lee),이동일(Dongil Lee),신구용(Koo-Yong Shin) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
송배전용 설비에 사용되는 애자의 신뢰성은 전기적인 절연성질과 기계적인 내구성 뿐만 아니라 애자가 설치된 송전선로의 오손에 의한 내환경성에 의해서도 결정될 수 있다. 지금까지 염분 및 분진이 심한 지역에서 오손물이 애자에 미치는 영향에 대한 연구는 전기적, 기계적 신뢰성에 영향을 미치는 오손물질의 성분 분석 등을 통해 저압과 고압의 환경에서 진행되어 왔다.[1] 본 논문에서는 2003년부터 우리나라에서 운전해 오고 있는 765㎸ 애자오손 신뢰성 검토와 미국 전력연구원(EPRI)에서 수탁받은 765㎸ 고분자애자 특성연구의 일환으로, 765㎸ 상용선로에 사용되는 애자류에 대한 장기열화특성을 연구하기 위해 765㎸ 실증 시험설비를 구축하였다. 아울러, 765㎸ 애자 장기열화특성 분석을 위한 기초연구로 염분 및 분진 오손도를 측정하여 765㎸ 환경에서 애자종류에 따른 오손 특성을 검토하였다. 그 결과, RTV 실리콘고무 코팅 애자가 자기 및 유리재 애자에 비해 염분 오손도 면에서 비교적 우수한 특성을 지님을 확인 할 수 있었다.
최인혁,신구용,임윤석,구자빈,손주암,임대연,오태근,윤영근,Choi, In-Hyuk,Shin, Koo-Yong,Lim, Yun-seog,Koo, Ja-Bin,Son, Ju-Am,Lim, Dae-Yeon,Oh, Tae-Keun,Yoon, Young-Geun 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.3
This paper investigates the soundness of porcelain insulators associated with the acoustic emission (AE) technique. The AE technique is a popular non-destructive method that measures and analyzes the burst energy that occurs mainly when a crack occurs in a high-frequency region. Typical AE methods require continuous monitoring with frequent sensor calibration. However, in this study, the AE technique excites a porcelain insulator using only an impact hammer, and it applies a high-pass filter to the signal frequency range measured only in the AE sensor by comparing the AE and the acceleration sensors. Next, the extracted time-domain signal is analyzed for the damage assessment. In normal signals, the duration is about 2ms, the area of the envelope is about 1,000, and the number of counts is about 20. In the damage signal, the duration exceeds 5ms, the area of the envelope is about 2,000, and the number of counts exceeds 40. In addition, various characteristics in the time and frequency domain for normal and damage cases are analyzed using the short-time Fourier transform (STFT). Based on the results of the STFT analysis, the maximum energy of a normal specimen is less than 0.02, while in the case of the damage specimen, it exceeds 0.02. The extracted high-frequency components can present dynamic behavior of crack regions and eigenmodes of the isolated insulator parts, but the presence, size, and distribution of cracks can be predicted indirectly. In this regard, the characteristics of the surface crack region were derived in this study.
자기재/폴리머 계면이 하이브리드 애자의 미세구조, 절연특성과 전계분포에 미치는 영향
조준영,김우석,안호성,안희성,김태완,임윤석,배성환,박찬,Cho, Jun-Young,Kim, Woo-Seok,An, Ho-Sung,An, Hee-Sung,Kim, Tae-wan,Lim, Yun-Seog,Bae, Sung-Hwan,Park, Chan 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.9
Hybrid insulators that have the advantages of both porcelain (high mechanical strength and chemical stability) as well as polymer (light weight and high resistance to pollution) insulators, can be used in place of individual porcelain and polymer insulators that are used for both mechanical support as well as electrical insulation of overhead power transmission lines. The most significant feature of hybrid insulators is the presence of porcelain/polymer interfaces where the porcelain and polymer are physically bonded. Individual porcelain and polymer insulators do not have such porcelain/polymer interfaces. Although the interface is expected to affect the mechanical/electrical properties of the hybrid insulator, systematic studies of the adhesion properties at the porcelain/polymer interface and the effect of the interface on the insulation characteristics and electric field distribution of the hybrid insulator have not been reported. In this study, we fabricated small hybrid insulator specimens with various types of interfaces and investigated the effect of the porcelain/polymer interface on the microstructure, insulating characteristics, and electric field distribution of the hybrid insulators. It was observed that the porcelain/polymer interface of the hybrid insulator does not have a significant effect on the insulating characteristics and electric field distribution, and the hybrid insulator can exhibit electrical insulating properties that are similar or superior to those of individual porcelain and polymer insulators.