Internal electrode for composite insulator and equalizing ring configuring method as well as composite insulator thereof

Abstract

The invention relates to a method for improving the distribution of the electrical level of a composite insulator in a power transmission line and controlling an end electric filed thereof. According to the method, an inner electrode and an equalizing ring are arranged on the conducting wire side of the composite insulators for the high-voltage power transmission line; and the pole tower side is only provided with an inner electrode. The composite insulator formed by the method comprises an epoxy core bar with an umbrella skirt and a jacket covered outside, and hardware fittings on two ends; the conducting wire side of the core bar and a bar body of the pole tower side are respectively embedded with an inner slender electrode made of metal material; the conducting wire side of the core bar is provided with an equalizing ring which is made of the metal material and consists of a bracket and a ring; and the shape of the ring can be a cirque, an opening ring, an elliptical ring, etc. The method can realize the even distribution of the electric field of the conducting wire side and the pole tower side of the composite insulator, reduces the distribution of the electric levels on two sides, inhibits the corona discharge and electric deterioration of the composite insulator and improves the reliability of safe operation of an electric power system.

Description

technical field [0001] The invention belongs to the technical field of insulators for high-voltage transmission lines, and in particular relates to a configuration method for an inner electrode and a voltage equalizing ring of a composite insulator and a composite insulator which is applied to various voltage levels and equipped with inner electrodes on both sides Background technique [0002] With the development of power systems and the continuous improvement of voltage levels, composite insulators have gradually been widely used in high-voltage transmission lines due to their advantages in pollution flashover and wet flashover, and their usage is increasing. In the prior art, composite insulators for overhead transmission lines only have metal fittings of small size at the upper and lower ends, and the main capacitance formed by them and the epoxy mandrel is much smaller than that of porcelain or glass insulator strings. The influence of capacitance leads to the extremely...

AI Technical Summary

Problems solved by technology

Since this kind of inner end bears and transmits the mechanical load of the composite insulator, the size is very large, which leads to the weakness of the epoxy resin mandrel at the end part, which also causes the mechanical load capacity of this part of the mandrel to be low, whether it is tensile or torsion

In addition, the structure of this kind of composite insulator is also relatively complex and difficult to process

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