• Proceedings of the KIEE Conference
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• 1994.11a
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• pp.39-41
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• 1994

In this paper, an expert system is proposed to deal with restoration problem in a unmanned substation to improve the reliability of power supply and the efficiency of power system management. The proposed expert system searches a switching sequence to rectorate the blackout region using heuristic rules and displays the operation sequence. The expert system uses the X-window on UNIX for the graphics of the expert system. The proposed expert system show a promissing result to a future application.

• Proceedings of the KIEE Conference
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• 1988.11a
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• pp.111-114
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• 1988

With the increase of size and complicacy of power systems, distribution system need to operate effectively for high reliability. In order to achieve this purpose, the study which apply expert system to operating plan, restoration on fault and distribution system operating, has developing actively. The essential element of the study is system line state which make a system observe. The development of expert system on power system operation make a system be able to judge state of loading and looping system line, related current direction, substation, and distribution line, atomatically by breaker operation. Finally, this paper developed expert system which decides itself atomatically by rules for deciding system line state.

• Proceedings of the KIEE Conference
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• 2001.05a
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• pp.319-321
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• 2001

When the fault occurred at distribution system, the restoration was late. There are 2 reasons The one is the error of fault location the other is multiple possible candidates of fault location. This paper presents two of new techniques for diagnosing fault regions. The proposed diagnosis scheme is capable of accurately identifying the location of fault upon its occurrence. based on the integration of information available from protective devices and measured load current change at the substation. In this paper expert system for real fault region is presented using these facts. Testing of the developed system using EMTP Simulation Model has demonstrated.

• Transactions on Electrical and Electronic Materials
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• v.15 no.3
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• pp.117-124
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• 2014

The calculation of short-circuit currents is important for power systems operation and restoration, and for determining the means to protect human lives and properties. In this paper, a part of a power system network, around the D$\breve{e}$tmarovice power station in Czech Republic, was simulated by the well known program EMTP-ATPDraw (Electromagnetic Transients Program-Alternative Transient Program), and short-circuit currents and voltages were calculated at different points in the electric network and presented as a time function by the PlotXY program. Calculations were done just for phase-to-ground, and for the three-phase short-circuit at the Kun$\check{c}$ice substation. The results were important for determining the characteristics of the equipment required to withstand or break the short-circuit current; for this reason, the calculations were repeated using earth-fault resistances only for the case of busbar KUN shown in Figs. 5 and 6.