One-large two-small umbrella-shaped DC composite post insulator used for high altitude area

Abstract

The invention discloses a one-large two-small umbrella-shaped DC composite post insulator used for high altitude areas. The composite post insulator is formed by a glass core rod, an outer umbrella cover, and end metal flanges, wherein the core rod is provided with a silicone rubber sheath. The silicone rubber sheath is uniformly provided with silicone rubber umbrella skirts. The umbrella skirts are formed by arranging a plurality of large umbrella skirts which are equal in diameters, and two small umbrella skirts between each two adjacent large umbrella skirts. The distance between the adjacent large umbrella skirts is 90-180 mm. Average umbrella extension of an umbrella skirt unit is 55-90 mm. The extension difference of large umbrella skirt and small umbrella skirt is 20-60 mm. Through cooperative effect of the umbrella extension of the large umbrella skirts and small umbrella skirts, umbrella distances, and other parameters, umbrella skirt structural parameters of the composite post insulator whose DC flashover performance is optimal are obtained, so that the composite post insulator has excellent stain-resistant wet-flashover performance under the condition of the same structure height, and consumption of umbrella skirt materials of the insulator is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of insulator manufacture, and in particular relates to a DC composite post insulator and its shed structure. Background technique [0002] Post insulators are essential components in power transmission engineering. In converter stations, they play an important role in supporting equipment and electrical insulation, and play a very important role in power systems. With the continuous improvement of the voltage level, in order to meet the requirements of external insulation, the diameter of the main body and the height of the structure of the traditional porcelain post insulator are bound to become larger and larger. However, for manufacturers, it is very difficult to manufacture porcelain post insulators that meet both external insulation requirements and mechanical strength. Composite insulating materials are widely used in my country because of their excellent pollution flashover resistance. [0003] At p...

AI Technical Summary

Problems solved by technology

But so far, the research on the optimal design of shed structure parameters for composite post insulators is still blank.

[0004] For the selection and design of DC composite post insulators, at present, most of them start from operating experience, and only from the perspective of increasing the creepage distance to ensure the external insulation performance of the insulator

Images