Arrangement of Low-Voltage Network for Minimization of Number of Pole Transformers in Distribution System

T. Sugita, D. Iioka, Y. Yokomizu, T. Matsumura, K. Oishi, E. Umemura, and T. Mitsuishi (Japan)

Keywords

Power distribution, Lowvoltage line, Pole transformer,Optimum construction, Power system planning

Abstract

This paper proposes a new method to search the optimum low-voltage distribution network which can supply suffi cient power to customer's loads by a minimum number of pole transformers. The construction of pole transformers and low-voltage lines are arranged under the requirement that the voltage distribution along the low-voltage line re mains within a pre-determined tolerance level. It is found that there is a chance the number of transformers in the op timum system decreases by 50 % compared with a current system, while the total length of the low-voltage lines is longer by 50 %. As a result, it is possible to reduce the construction cost of the distribution system by 3 % 10 %, depending on the load density. The higher the load den sity in the area is, the better is reduction in the construction cost.

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