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정재기(J. K Jeong),최윤종(Y. J. Choi),강창익(C. I. Kang),장훈기(H. K. Jang),곽희섭(H. S. Gwak) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.5
This research is focused on the development of GIS Diagnostic SYSTEM to prevent accidents beforehand by inspecting the internal defects of GIS (Gas Insulated Switchgear) which is a main power-facility for substations. GIS Diagnostic SYSTEM is categorized as 'Real time on-line test type' and 'Portable test type' depending on the types of testing, it uses PD(partial discharge) which mostly incurs in GIS internal defects, to inspect. As of now, mostly foreign equipments are imported for use due to the lack of the technology localization, and these are installed and operated on only some parts of highly-graded GIS power-facilities such as in 765㎸ or 345㎸ for its being expensive. Furthermore, other than foreign equipments being costly, it also has a weak point of very long unavailability in case of Diagnostic system break-down while using, because it takes a comparatively long period of corrective maintenance processes. We have localized to develop personal real-time multi-functional GIS Diagnostic system which can test on all GIS power-facility comprehensively and economically therefore overcome all these problems mentioned above, a market expansion is expected from the decrease of price and replacing the import equipments in the future. As the equipment was developed to be personal for the simple ways of installing and utilizing, it can be operated without any complex cable installation like other existing GIS Diagnostic system requires, therefore also decrease the cost of cable installation.
장훈(H Jang),김영범(Y.B Kim),권갑주(K.J Kwon),윤인식(I.S Yoon),윤재원(J.W Yoon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Unsteady state fluid flow is caused by the very high-potential energy of fluid like cavitation, flashing and hammering in the Nuclear Power Plants. The main components of a valve are damaged by them. The control valve under high pressure drop that limites velocity of fluid on 30m/s is used to solve the problems. In this case, the reduction of generating power is caused by fail to the control of fluid. In this paper, the control valve trim under high pressure drop which is called Helical Trim was developed to control fluid flow. The pressure, velocity, and movement Pattern of fluid in control valve were analyzed by using numerical analysis program which is called ANSYS CFX. It was performed to compare calculated valve flow coefficient using dynamic characteristics test facility and design data and relevance of high-precision fluid control was analyzed.