Preparation and application of basin-type insulator with modified coating

Abstract

The invention relates to the field of design and manufacturing of high-voltage switch equipment, and discloses preparation and application of a basin-type insulator with a modified coating. The methodspecifically comprises the following steps: forming a central insert and an epoxy casting body through a vacuum casting process, and then assembling the central insert and the epoxy casting body witha grounding shell into a whole on a GIS or a GIL; and respectively connecting the central insert with a concave surface conductor and a convex surface conductor into a whole to form a high-voltage conductive channel, and adding a modified coating on the creepage edge surface of the epoxy casting body. According to the invention, a nano modified coating is applied to a high-voltage basin-type insulator, the electric field distribution of the whole structure is adjusted through different dielectric constants of the nano coating, and the relationship between the dielectric constants and the voltage distribution is utilized, so that the field intensity of the flange air gap is reduced, and the partial discharge of the air gap is eliminated; and the problem of three-intersection-point field intensity concentration of high potential and low potential is solved by adjusting the distribution of the electric field along the surface of the basin-type insulator, so that the reliability of the product in the use process is improved, and the overall miniaturization is also facilitated.

Description

technical field [0001] The invention relates to the field of design and manufacture of high-voltage switchgear, in particular to the preparation and application of a basin-type insulator with a modified coating. Background technique [0002] As a key component of GIS and GIL equipment, the basin insulator plays the role of isolating the air chamber, supporting the conductor and insulating. The current structure of the basin insulator is mainly composed of epoxy resin casting basin body, central conductor insert and external method Flange (can be epoxy resin or metal flange), the reliability of the pot insulator as a key part of GIS and GIL is very important to the operation of the overall equipment line, so in the design and production process of the pot insulator, for The requirements for electrical performance and mechanical performance are becoming more and more stringent. With the rapid development of high-voltage and ultra-high voltage, the requirements for electrical p...

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Problems solved by technology

[0003] A Chinese patent discloses a nano-silicon oxide insulator for suppressing VFTO (authorized notification number CN107359028B). From the perspective of the application of the pot insulator and the overall electric field distribution, the field strength of this patent is mainly concentrated in the high-voltage area (around the central insert) The three-point of intersection, and the position of the three-point of intersection of low potential (fixed flange), and in the actual test, it often starts to discharge from the appeal area and finally forms a flashover along the surface, so the solution in the patent cannot effectively solve this problem ;

Although the patented solution increases the creepage distance, it will cause the field strength to be too high at the transition position of the round corner, thereby causing the charge to accumulate

[0005] A Chinese patent discloses a flexible gradient surface treatment method for tub-type insulators used in UHV AC GIL (authorized announcement number CN111599553A). This patent uses electrospinning to electrospin PVA with a gradient distribution of dielectric constant on the surface of epoxy resin substrates. / BaTiO3 material thin film forms a deposition layer with a two-dimensional gradient distribution of dielectric constant on the surface of the pot insulator. Because of its single substrate, it can only make the distribution trend of dielectric gradient decrease, and cannot make flexible according to the specific electric field distribution. Adjust the configuration. At the same time, the coating quality of this treatment method is not as good as the strength and bonding performance of the nano-coating, and it cannot exactly solve the problem of the field strength along the surface at the position of the three intersection points of the product.

[0007] 1. Due to the design and manufacturing process of the current pot insulator, there will be a certain gas gap between the epoxy resin and the metal flange of the outer ring. The gas gap is an air gap. As the voltage level increases, the gap is prone to partial Discharge problem;

[0008] 2. In addition, due to the development of high-voltage and ultra-high voltage and the demand for product miniaturization, the creeping field strength of pot insulators is getting higher and higher when the overall structure and creepage distance remain unchanged, especially in low-potential and high-voltage areas. The problem of the three-point intersection is very prominent, and gap discharge and flashover along the surface are easy to occur during the experiment, which affects the performance and life of the product. Therefore, those skilled in the art provide a pot-type insulator with a modified coating. application, to solve the problems raised in the above-mentioned background technology

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