Selecting the optimum type and size of conductors for planning and optimization of distribution networks is an essential part of the design process. In this paper, a new and efficient algorithm to the optimal selection of conductors of feeder sections of radial distribution networks is proposed. In optimization procedure, cost of conducting material, cost of energy losses, bus voltage profile and current carrying capacity of conductors are considered. This algorithm is easy to programming and needs no approximation of actual condition. The proposed method can be applied for optimal planning of radial electric distribution systems. Effectiveness of the proposed method is shown by case study in a radial network.

Abstract-Advantages of XLPE covered conductors in comparison with bare conductors of low voltage and medium voltage power distribution networks are introduced. The configuration, production and application of these conductors in Iran are discussed and the electromagnetic effects of them are studied through the simulation results carried out by finite element methods.

A result of development of computer technology, geographic information systems (GIS) is now being used in the operation of power distribution systems. GIS is a special-purpose digital database in which a common spatial coordinate system is the primary means of reference. Comprehensive GIS require a means of: data input (from maps, satellites, surveys, and other sources), data storage, data transformation, analysis, modelling, and data reporting (such as maps, reports, and plans). This paper presents a new methodology for perform distribution operation based on GIS. It uses a programming model for power distribution's dynamic data. This model, using static network information (network location, path lines, and geographic conditions) and the use of dynamic information network (at the moment, line voltage and current) will apply to the computation time. Customer's loads is calculated. By the proposed method, using the program modules, the customers load can be updated according to load balancing. To demonstrate the effectiveness of the integrated GIS system with application programs for distribution operation, a zone at East Azerbaijan electric power system distribution Co. is selected as a real case study.

This paper presents design and mass production procedure of 20 and 33 kV spacers of overhead spacer cable distribution systems. All mass production steps including the initial design, making the prototype, tests and mass production are presented. The proposed mechanical, lightning strike, power frequency dry/wet discharge/withstand voltage tests procedure and limiting values are presented and used on mass produced spacers.

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