Compound insulator with core rod structure

Abstract

A composite insulator with an inner mandrel structure relates to an insulator used in a high-voltage transmission line. It consists of a mandrel, an shed outside the mandrel and metal ends at both ends of the mandrel. An inner mandrel is embedded in the mandrel, and glass fibers impregnated with an epoxy resin matrix are arranged in parallel along the longitudinal direction of the mandrel, or partially Wrap or weave at an angle to the longitudinal direction as required. The invention adds an inner mandrel to the outer mandrel, increases the metal part of the composite insulator, improves the problem of extremely uneven electric field of the traditional composite insulator; increases the mechanical strength of the outer mandrel, and increases the creep of the outer mandrel The backup protection is improved; the skeleton effect of the outer mandrel is enhanced, which can effectively prevent the mandrel from being brittle; it also solves the problem that the longitudinal insulation strength of the mandrel is not as high as that of the transverse direction.

Description

technical field [0001] The invention relates to an insulator used in a high-voltage transmission line. Background technique [0002] The function of the insulator is to separate the conductors with different potentials, so as not to allow current to pass between the conductors, so as to maintain different potentials between them. Insulators are generally made of insulating materials with extremely high resistance. This material can be used to isolate charged or different potential conductors, so that current can flow in a certain direction. [0003] According to different insulating materials, insulators can be divided into three categories: porcelain insulators, glass insulators and composite insulators. Composite insulators consist of three parts: mandrel, shed and metal end. The core rod of the composite insulator is the bearing part of the mechanical load of the insulator, and at the same time it is the main part of the internal insulati...

AI Technical Summary

Problems solved by technology

[0011] 4. Creep

[0012] If the load on the drawing rod does not reach the short-term tensile failure load, but as long as the load reaches the load that causes the fiber defects inside the drawing rod to gradually break and develop, the drawing rod will not crack immediately, but after a long enough After the accumulation of internal damage over time, fracture damage will still occur when the strength of the drawing rod drops below the load. This is the creep characteristic of the drawing rod material. This characteristic must be given sufficient consideration in the design and use of composite insulators. Pay attention to

[0013] 5. The problem that the longitudinal dielectric strength is lower than the transverse dielectric strength

[0015] 6. Hydrolytic destructiveness

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