Abstract
The distribution system is the closest network to the customer. Therefore, the distribution network should be designed economically to obtain a particular level of quality. A good long-term planning needs to be carried out to get such a system. One such plan is to get the optimal sizing and placement of distribution transformers. The objective of the study is to obtain optimal location and capacity of the distribution transformer in PT PLN (Persero) East Medan, North Sumatra. The location and optimum capacity are obtained by minimizing the investment costs and operational costs of electric power distribution system without violating voltage constraint. Genetic Algorithm method is used to get the optimal costs. The results show that optimal sizing and placement distribution transformers problem in PT PLN (Persero) East Medan, Sumatera Utara can be solved efficiently using Genetic Algorithm in less than 200 generations. Sensitivity analysis on the utilization factor, demand factor and coincidence factor have been reported. The increase of the demand factor and coincidence factor are directly proportional to the increase in investment costs. Meanwhile, the utilization factor is inversely proportional to the value of the investment cost.
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