Rod-shaped column type porcelain-polymer composite insulator for electrified railway and preparation method thereof

Abstract

The invention discloses an electrified railway-used bar-shaped column type porcelain polymer composite insulator. The composite insulator comprises a porcelain core bar with more than one porcelain umbrella skirt. Two ends of the porcelain core bar are adhered with metal fittings via an adhering agent. The external surface of the porcelain core bar is covered with a polymer sheath with more than one polymer umbrella skirt. The surface of the porcelain core bar is processed via a coupling agent. The sheath and the umbrella skirt are solidified via high temperature and formed in one step on the porcelain core bar via an overall injection or pouring process. The umbrella skirt on the sheath comprises more than one large umbrella-shaped protrusion which is coaxially arranged with the porcelain core bar. The umbrella of the large umbrella-shaped protrusion is from 30mm to 60mm after the umbrella stretches out. The electrified railway-used bar-shaped column type porcelain polymer composite insulator which is pollution-flashover-resistant, bird-pecking-resistant and wind-and-sand-resistant is high in pollution flashover voltage so that crack and break in the process of using can be prevented. Meanwhile, the electrified railway-used bar-shaped column type porcelain polymer composite insulator has characteristics of being bird-trouble-resistant, wind-and-sand-resistant, external-force-damage-resistant and assistant in climbing and stepping.

Description

technical field [0001] The invention relates to a composite insulator, in particular to a rod-shaped column type porcelain-polymer composite insulator for electrified railways and a preparation method thereof. Background technique [0002] Composite insulators are favored by the industry because of their great advantages over porcelain insulators in terms of weight 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. [0003] The influence of the umbrella diameter on the pollution flashover characteristics of the composite insulator is as follows: the increase of the umbrella diameter increases the equivalent diameter of the composite insulator, which has a negative im...

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Problems solved by technology

If the umbrella spacing is reduced, the creepage distance of the composite insulator can be increased when the insulation height is constant, but the pollution flashover voltage does not increase linearly with the increase of the creepage distance. The utilization rate is relatively lower

[0005] Existing composite insulators are basically made of glass fiber reinforced epoxy rods inside. Because of their poor weather resistance, they cannot be exposed to the atmospheric environment. At the same time, according to incomplete statistics, there have been many insulator brittle fracture accidents in domestic power systems. , brittle fracture often occurs at the high-voltage end of the composite insulator where the field strength is concentrated, and the composite insulators that have brittle fracture accidents generally have damaged sheaths and end seals

It is generally believed that the probability of brittle fracture is very small, it cannot be prevented, it cannot be detected, and it is extremely harmful to the catenary

[0006] Composite insulators used in electrified railway catenary operate in a wide geographical range, and different regions have their own geographical particularities, resulting in complex operating conditions. At the same time, there are external uncertainties in the transportation, installation and maintenance of composite insulators, which affect the safe operation of composite insulators

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