The problem of losses in the distribution system assumes greater importance with the price of fuels no longer a relatively minor factor in the supply of electric energy. It is difficult to measure the actual energy losses in such a system, as many other factors are included in the different between the energy consumed by each of the consumers connected to it and the energy sent out by the power plant. In general the loss varies with the square of the current flowing; reducing the value of such current will reduce losses. The present paper is focused on methodologies for power planning and operation of distribution system so the power plan just run smoothly and reduces the loss. This paper concentrates around the development of knowledge based methodology for some of DA functions. The major areas of the research are: Planning of distribution system, Sequence switching and service restoration of distribution system and optimal reactive power control in distribution system.

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