Direct current cable accessory silicon rubber insulation surface layer molecular structure regulation and control device and method

Abstract

The present invention discloses a direct current cable accessory silicon rubber insulation surface layer molecular structure regulation and control device and method. The method comprises the following steps: (1) employing a vacuum pump to extract internal air of a reactor, closing the vacuum pump after vacuum pumping is completed, opening a nitrogen cylinder reducing valve, injecting nitrogen into the reactor and reaching an environment air pressure, and repeatedly performing the process for at least five times; (2) slowing filling fluorine and nitrogen gas mixture with 20% of volume fraction of fluorine into the reactor to allow the air pressure in the reactor to reach up to 300 mbar; (3) going on filling fluorine into the reactor until the air pressure of the reactor reaches up to 500 mbar to allow the fluorine and nitrogen gas mixture to react with silicone rubber samples, keeping the temperature in the reactor at 25 DEG C, replacing C-H bond in the silicone rubber sample surface layer molecule with C-F bond after a certain reaction time, and obtaining the silicone rubber samples with a surface layer molecular structure forming a space charge shielding layer having electronegativity. The direct current cable accessory silicon rubber insulation surface layer molecular structure regulation and control device and method can enhance the charge screening effect of the direct current cable accessory silicon rubber insulation space.

Description

Technical field [0001] The invention relates to the field of enhanced insulation space charge shielding methods, and more specifically, to a device and method for regulating and controlling the molecular structure of a silicon rubber insulating surface layer of a DC cable accessory. Background technique [0002] With the continuous development of industrialization and the continuous progress of science and technology, polymer-based solid dielectric materials are increasingly used in high-voltage engineering, power electronics, microelectronic insulation, and various special sensors that rely on charge retention and polarization behaviors. The more extensive. Especially in recent years, polymer nanocomposites based on polymers have sprung up and become a research hotspot in electrical insulation and related professional fields. [0003] Silicone rubber composite insulation is used as a reinforced insulation for cable accessories due to its excellent dielectric properties, high and ...

AI Technical Summary

Problems solved by technology

At present, the commonly used method is to paste a layer of insulating film on the surface of the polymer, but although this method can suppress the injection of space charges, it also changes the insulating structure and electric field distribution, directly affecting the dielectric and shock properties of silicone rubber insulation. Wear and flashover properties, etc., so this kind of method has not yet been reported on related applications

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