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변전소 자동화를 위한 Alarm Processing 방법 개발
진보건(B.G. Jin),현승호(S.H. Hyun),이승재(S.J. Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
There are many alarms in Substation Automation System because of data types and quantities increasing, so it is very difficult for operators to know the actual situations. In order to help operators easily make decision, some unnecessary alarms should be removed or combined as one. In this paper, alarm processing is using the structure of substation system and the relation of measured data and events to make some rules. Conventional alarm processing just gives data, but proposed alarm processing gives the whole information. In a simulation model system, the data such as voltage, current and CB status are collected by HyperSim and saved in DB, then proposed alarm processing has been testified using those data based on real-time simulation.
권영진(Y.J Kwon),강상희(S.H Kang),현승호(S.H Hyun),한문섭(M.S Han),이재경(J.K Lee) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
A DC railway system has low feeder voltage, The fault current can be smaller than the current of load starting. So it is important to discriminate between the small fault current and the load starting current. The load starting current increases step by step but the fault current increases all at once. As for the load starting current, the time constant of load current at each step is much smaller than that of the fault current. First, to detect faults in DC railway systems, an algorithm using the time constant calculated by the method of least squares is presented in this paper.