The transmission lines are very important in the transmitted of electrical power, and the process of selecting the voltage of the line is an important task in the design and implementation process. The process of transferring electrical power from one side then onto the next place for long away. While maintaining the percentage regulation within the permissible limits is an important problem in the transfer of energy. In electrical transmission line there are important elements are resistance, inductance and capacitance. The purpose of this paper is to study and calculate economic high-tension voltage and selection of overhead line conductor ACSR.
A line bus security index is added to the generation cost forming a new objective function a suitable for optimal power system dispatch. The value of this security index is directly proportional to the sum of the squares of voltages of both bus voltage and line flows. Normal as well as contingency states of a power system are successfully dispatched. Result obtaining during a normal state of both the 6-bus and modified 30-bus cost. Both systems are also dispatched when the outage contingencies are assumed. Successful dispatch results are obtained without any load shedding. Power system reliability is seen to be greatly improved through the present reliable optimum dispatch.
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