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Wetting에 의한 필댐 상류측 shell의 거동특성
임희대,백장열,이영섭 충남대학교 산업기술연구소 1999 산업기술연구논문집 Vol.14 No.2
The primary objective of this paper is to see the behavior characteristics of rockfill dam due to wetting. There are many factors which affect the dam failure. One of them is the influence of reservoir filling. Differential movements in dam and foundation develop during reservoir filling, they induced cracking and consequent erosion, and sometimes caused dam failure. One of the major factors contributing to the development of differential movements during reservoir filling is the compression due to wetting which occurs in a wide variety of different types of soils including rockfill. To perform the numerical analysis of dam behavior adequately, the large-scaled triaxial test is needed to consider the effect of wetting on dry and wet rockfill material. But, As the large-scaled triaxial test is high capital cost and not available apparatus for a number of other experiment, it is not applied many case in the country. In this paper, the data of Oroville dam which performed the large-scaled triaxial test is referenced to find out stress-strain curve and hyperbolic parameters on wetting for modeled dam which is not performed the large-scaled triaxial test. So, effect of wetting on modeled dam can be considered for numerical analysis of dam behavior. As a result of numerical analysis, they estimate that horizontal and vertical displacement are increased with the rate of increasing wetting, and shear stress too. Because compression and shear strength is decreased with proceeding wetting. And results of analysis show that load transfer is not affect significantly by the wetting.
적외선방사카메라를 이용한 변압기 부싱 온도분포 모니터링
임장섭,이우선,이영식 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
An electrical accident such as mishap electricity institution occurs frequently because of the increase of demand for electricity, complexity of electricity institution. The techniques that discovered a mishap to electricity institution are electric signal method and supersonic waves method, thermal sensing method by infrared rays. The IRR-camera which is effective monitoring method of electricity institution is diffused in industrial field. Specially, infrared rays monitoring can perceive heat which was visually poor observed objection. Also, infrared rays monitoring can monitor an area of difficulty of access of work human power. In this study, infrared rays monitoring of a transformer substation is periodically performed. The connection between possibility of application and operation, blazing fire occurrence and progress process of body and bushing of large capacity transformer are performed by IRR-camera.
임장섭,정우성,이진 木浦大學校 工業技術硏究所 1995 工業技術硏究誌 Vol.5 No.-
The tree observation tehnique is being highlighted as a reasearch area for deterioration of insulation because of high-voltage power system. Many reseachers make efforts to develop not only diagnosis of aging state but also detection of defects in the initial stage from preventive diagnosis system. For the measurement of tree, image processing is actively studied as a experimental technique of electrical tree, because the conventional directed visual impossible to analyze on the tree degradation area, progressed direction, and tree pattern etc. In this paper, we have developed the tree measuring system using image processing. By using an image processing technique, the tree features which appear immediately after the tree initiation as well as changes in the configuration of the tree can be easily measured and observed than the conventional visual methods.
임장섭 木浦海洋大學校 2001 論文集 Vol.9 No.2
The conventional tracking testing as IEC-60587 is widely used in surface aging measurement of outdoor insulator because those testing can carry out very short time in Lab-testing. Also IEC-60587 testing is able to offer the standard judgement of relative degradation level of outdoor HV machine/system. Therefore it is very useful method compare to previous conventional tracking testing method and effective Lab-testing method. But surface discharges(SD) have very complex characteristics of discharge pattern so it is required estimation research to development of precise analysis method. In recent, the study of IRR-camera is carrying out discover of temperature of power equipment through condition diagnosis and system development of degradation diagnosis. In this study, SD occurred from procelain insulator, used 22.9[KV] distribution, is measured with partial temperature distribution in real time, the degradation grade of SD is analyzed through produced patterns in SD concentration according to applied time.
박용식,임장섭 木浦海洋大學校 1998 論文集 Vol.6 No.1
Fractal mathematics using image processing is being highlighted as a research method for classification of electrical tree. for image analysis of tree pattern, the fractal mathematics processing is actively studied as a experimental new technique of electrical tree.. But the application of Fractal dimension(FD) has been required the complicated calculation method because of its complex repetition progressing. In this paper, it has been developed the new approach method to express the Semi-Fractal Dimension(SFD) for high-speed calculation and on-line measurement system using special image processing algorithm. As a result after SFD testing, the recognized area of SFD has a good linear characteristics compared to FD.
조학현,임장섭 木浦海洋大學校 1998 論文集 Vol.6 No.1
This paper presents a study of new Al technique based partial discharge (PD) pattern classifier to power system application. After referring briefly to the developments of artificial neural network and diagnosis system theory based PD measurements, the paper outlines how the introduction of new emerging technology, namely chaos and fractal engineering methodologies has resulted in the design of a number of PD diagnostic systems for practical application of residual lifetime prediction. For an experimental study an appropriate PD database structure and selection of learning data size of PD pattern based on (semi)fractal dimension are introduced, and 3-D PD-normalization, extraction of relevant characteristic feature of a PD model are discussed. Some practical aspects encountered with unknown stress in the neural network techniques based real time PD recognition are also addressed.