Extra high voltage electric porcelain external insulation wire outlet sleeve tube

Abstract

The invention relates to an extra high voltage electric porcelain external insulation wire outlet sleeve tube which can be used for an extra high voltage GIS, a pipe mother, a circuit breaker and other equipment. The extra high voltage electric porcelain external insulation wire outlet sleeve tube comprises a porcelain sleeve, a grounding flange, and a conductive rod arranged in the center of the porcelain sleeve. A cylindrical grounding electrode is arranged between the conductive rod and the grounding flange. The porcelain sleeve at least has two adjacent sub sleeve tubes which are fixed to be a whole body through a transition member. A cylindrical middle electrode which goes through a below sub sleeve tube is arranged between the grounding electrode and the conductive rod. The middle electrode and the grounding electrode and the coductive rod are in an insulation state. According to the structure of the extra high voltage electric porcelain external insulation wire outlet sleeve tube, the electrical performance of the sleeve tube can be obviously improved, especially the wet flashover voltage and bending strength of the sleeve tube can be improved obviously, and the manufacture difficulty and manufacture cost of the extra high voltage porcelain sleeve are reduced at the same time.

Description

technical field [0001] The invention relates to an ultra-high voltage bushing, in particular to a porcelain jacket outlet bushing which can be used on busbars, GIS, circuit breakers and similar equipment. Background technique [0002] At present, there are two types of outer insulation for 550kV and above UHV circuit breakers and GIS outlet bushings: electric porcelain and composite. For outlet bushings with electric porcelain as the outer insulation, the porcelain bushings are basically tower-shaped structures (also known as cones). For 750kV products, the height is above 7m. Due to the technical characteristics of the molding and firing stages in the manufacturing process of the electric porcelain bushing, the height of the fired electric porcelain element does not exceed 2m, so the porcelain bushing of 550kV and above is made of several single-section porcelain bushings through inorganic bonding for secondary firing. The higher the porcelain piece, the higher the difficu...

AI Technical Summary

Problems solved by technology

In addition, since the grounding electrode will not be made too high, generally not more than 20% of the height of the porcelain sleeve (too high will cause the potential difference between the grounding electrode and the outer insulating surface of the porcelain sleeve to be too large and cause breakdown), so the voltage of the outer insulation The distribution is very uneven. Less than 20% of the height of the porcelain bushing at the lower end accounts for more than 50% of the distribution of the external insulation voltage. In the rainy state, the pagoda-like shape makes the rainwater at the lower end very dense, so the lower end is very prone to wet flashover

Images