Bar-shaped composite insulator

Abstract

The invention discloses a bar-shaped composite insulator comprising a core bar, fittings arranged at two ends of the core bar and sheaths with an umbrella skirt structure; the sheaths are covered on the core bar externally; fittings at compression joint positions of the fittings and the sheaths are internally provided with two annular grooves respectively; the upper dip angle of the umbrella skirt structure is 8 degrees and the lower dip angle of the umbrella skirt structure is 0 degree; the umbrella structure comprises large umbrellas with the same diameter and two small umbrellas with the same diameter between every two adjacent large umbrellas, or large umbrellas with the same diameter and one umbrella with the same diameter between every two adjacent large umbrellas, wherein the large umbrellas are coaxially arranged with the core bar; and umbrella spacing, extension ratio of the umbrellas and umbrella extension are designed reasonably so as to optimize the umbrella structure, thereby reaching the optimal pollution flashover property. The annular grooves are arranged inside the fittings at the compression joint positions of the fittings and the sheaths, thus the grooves are full of the compressed sheaths, thereby realizing the high-intensity sealing and preventing the composite insulator from breaking in use.

Description

technical field [0001] The invention relates to the field of composite insulators for electrified railway contact nets, in particular to a rod-shaped composite insulator used in electrified railway contact nets with a speed of 350 km / h. Background technique [0002] Composite insulators are favored by the industry because of their great advantages over porcelain insulators in terms of weight, zero value, and pollution flashover voltage, especially the high pollution flashover voltage. The study found that there is a certain relationship between the shed structure of the composite insulator and the pollution flashover voltage, so that the composite insulators with the same other conditions but different shed structures have different pollution flashover voltages. The equal-diameter umbrella structure is not conducive to suppressing arc bridging between umbrellas caused by continuous water film and water flow, so its overall performance is poor. The influence of the umbrella ...

AI Technical Summary

Problems solved by technology

[0004] In addition, the composite insulator running on the catenary will be subjected to the long-term action of the electromechanical load, and the mechanical strength of the composite insulator will decrease with time. The main reason for this phenomenon is that the mandrel material itself has creep characteristics, and if the crimping process The unreasonable design of the medium crimping parameters causes the stress in the crimping area between the fittings and the mandrel to be too concentrated. Under the action of long-term electromechanical loads, the mechanical strength of the composite insulator will decline faster

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