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According to electricity development, development of a new porcelain insulator design applied to distribution networks is an important work. The new porcelain insulator replaces the crossarms.
Abstract:
Insulator design applied to distribution networks in Brazil. The mechanical modeling allows the analysis of the flexural strength. In the electrical modeling an axi-symmetric electrostatic formulation is applied to study the porcelain insulator performances. This analysis allows to examine if the electric field values are above of the dielectric strength values of the material, which would result in the rupture of the dielectric. After this, the prototypes are manufactured based on the simulations and tested electrically according to Brazilian standard. The use of this new porcelain system in replacement of the current system presented the following characteristics: higher insulation weather resistance, higher safety, lower maintaining, the same installation cost, and the advantage of being more aesthetically pleasant.
Introduction
Distribution networks in Brazil are predominantly overhead lines and built with bared conductors, requiring a constructive pattern that uses reliable insulators and a variety of accessories for mechanical fastening, as crossarms and hardware. The need to increase the reliability of distribution networks as well as reduction of construction cost and mainly for its operation and maintenance motivated the development of a new design for mounting and insulation of medium voltage networks.
The current system of insulation for distribution networks of medium voltage consists of crosshead, metal fittings and electrical insulator (Fig. 1). This system has a low weather resistance, difficulty in installation and maintenance and in some cases low levels of electrical insulation. This paper presents the development of a new porcelain insulator design applied to distribution networks in Brazil. The use of this new porcelain system (Fig. 2) in replacement of the current system presented the following characteristics: higher insulation weather resistance, higher safety, lower maintaining, the same installation cost, and the advantage of being more aesthetically pleasant.
FIg.1 Fig.2
Development of insulator geometry
The new porcelain system is designed to replace the current system in distribution line until 25 kV of the CELESC.
Fig. 3 shows the initial basic geometry. In this geometry the mechanical and electrical simulations were performed.
The definition of dimensions and materials that form the insulator was obtained by mechanical simulation of the assembly. These simulations were performed using the Solid Edge ST and the solver NX Nastran. For this, one insulator extremity was setting and in other extremity was applied loads of 5000 N, 8000 N and 10000 N (Fig. 4).
The mechanical simulations indicated the need of the use of strengthening core to improve the mechanical behavior and ease of assembly.
This paper presented some results of a new porcelain insulator design applied to distribution networks in Brazil. Now, the prototypes will be tested through application of the insulating porcelain systems in a distribution network located in a region of great severity of use. Development of a new porcelain insulator design applied to distribution networks are possible widely used in electrical system.
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