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정재기(J. K. Jeong),윤시영(S. Y. Yun),김석중(S. J. Kim),김근규(K. G. Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.5
SC(Static Condenser) in KEPCO is used in voltage control and power factor compensation. Currently KEPCO uses SC to 154㎸ 50MVA and 23㎸ 5MVA. It is not important in old days, because a SC bank accident has no effect on power system. But we are interested in the SC bank for power quality in these days. The SC Bank has a reactor and a condenser using series connection. It is operated in critical point for resonance circuit normally. Therefore the SC bank has a small reliability against other power instruments. If a 4th harmonic frequency as a resonance frequency is supplied in system, the condenser is damaged because of a resonance current. And a trip and a closing for CB(Circuit Breaker) in many times will have a big influence of SC bank destruction. General OCR(Over Current Relay) observing SC bank is not useful for this protection. We think that protection relay must be have the SC bank characteristics. A solution for this problem is active power, resonance frequency and impedance.
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.