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Flexible gradient surface treatment method of post insulator for extra-high voltage direct current GIL

A post insulator and UHV DC technology, which is applied in the field of preparation of modified insulating polymer materials, can solve problems such as manufacturing process defects, insulator electrical resistance reduction, flashover accidents along the surface, etc., so as to improve operation stability and prolong service life Effect

Inactive Publication Date: 2020-08-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the surface flashover voltage of post insulators is lower than the breakdown voltage of epoxy resin and the breakdown voltage of air, even in strict UHV projects, epoxy resin insulators are prone to failure due to insufficient insulation design, complex working environment or The electric field distortion caused by manufacturing process defects and the like lead to the occurrence of flashover accidents along the surface, which poses a huge threat to the stable operation of the power system
The mismatch between the electrical parameters of the insulating material and the atmosphere environment leads to local electric field intensity concentration at the position of the three junctions of the insulator, metal electrode and gas, and the reduction of the electrical resistance of the insulator is the main reason for the low initial voltage of the insulator's flashover along the surface. reason

Method used

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  • Flexible gradient surface treatment method of post insulator for extra-high voltage direct current GIL
  • Flexible gradient surface treatment method of post insulator for extra-high voltage direct current GIL

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Polish the surface of the insulator with sandpaper to remove impurities attached to the surface;

[0040] 2) Dissolve the PVA powder in deionized water, and disperse the CCTO (copper barium titanate) powder in absolute ethanol, and mix the two solutions uniformly at a certain ratio, stir with a motor at 90°C for 1 hour, and ultrasonically Shake for 2 hours to mix thoroughly, and degas in a vacuum oven for 40 minutes to obtain a PVA / CCTO mixed solution;

[0041] 3) Place the epoxy resin post insulator in the electrospinning equipment, and the needle port is perpendicular to the surface of the insulator; connect the power supply of the electrode needle at the needle port to charge the electrode needle; turn on the syringe propeller switch, and the paint is drawn from the needle port Spray to the surface of the insulator in a filamentary form; according to the gradient distribution of the insulator, the surface is divided into 4 adjacent rings from the center to the out...

Embodiment 2

[0043] 1) Polish the surface of the insulator with sandpaper to remove impurities attached to the surface;

[0044] 2) Dissolve the PVA powder in deionized water, and disperse the CCTO (copper barium titanate) powder in absolute ethanol, and mix the two solutions uniformly at a certain ratio, stir with a motor at 90°C for 1 hour, and ultrasonically Shake for 2 hours to mix thoroughly, and degas in a vacuum oven for 40 minutes to obtain a PVA / CCTO mixed solution;

[0045]3) Place the epoxy resin post insulator in the electrospinning equipment, and the needle port is perpendicular to the surface of the insulator; connect the power supply of the electrode needle at the needle port to charge the electrode needle; turn on the syringe propeller switch, and the paint is drawn from the needle port Spray to the surface of the insulator in a filamentary form; according to the gradient distribution of the insulator, the surface is divided into 4 adjacent rings from the center to the outs...

Embodiment 3

[0047] 1) Polish the surface of the insulator with sandpaper to remove impurities attached to the surface;

[0048] 2) Dissolve the PVA powder in deionized water, and disperse the CCTO (copper barium titanate) powder in absolute ethanol, and mix the two solutions uniformly at a certain ratio, stir with a motor at 90°C for 1 hour, and ultrasonically Shake for 2 hours to mix thoroughly, and degas in a vacuum oven for 40 minutes to obtain a PVA / CCTO mixed solution;

[0049] 3) Place the epoxy resin post insulator in the electrospinning equipment, and the needle port is perpendicular to the surface of the insulator; connect the power supply of the electrode needle at the needle port to charge the electrode needle; turn on the syringe propeller switch, and the paint is drawn from the needle port Spray to the surface of the insulator in a filamentary form; according to the gradient distribution of the insulator, the surface is divided into 4 adjacent rings from the center to the out...

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Abstract

The invention provides a flexible gradient surface treatment method of a post insulator for an extra-high voltage direct current GIL. A PVA / CCTO material film is electrospun on the surface of an epoxyresin substrate through an electrostatic spinning method, a deposition layer with conductivity in two-dimensional gradient distribution is formed on the surface of the post insulator, and the purposes of regulating and controlling distribution of a direct-current electric field on the surface of the post insulator and improving the electrical resistance of the insulator are achieved. According tothe invention, the epoxy resin post insulator with two-dimensional conductivity gradient distribution is constructed by controlling the electrospinning position and the spinning time, so that the electric field distribution condition of the surface of the post insulator under the alternating voltage is flexibly regulated and controlled, the surface flashover voltage of the post insulator in GIL equipment is improved, and the electrical resistance of the post insulator is improved.

Description

technical field [0001] The invention belongs to the field of preparation of modified insulating polymer materials in the field of high-voltage equipment manufacturing, and specifically relates to a method for manufacturing post insulators with a two-dimensional surface conductivity linear gradient distribution, which is mainly used in UHV DC GIL equipment to improve UHV DC The stability of GIL equipment operation and the safety and reliability of the power system. Background technique [0002] Gas-insulated metal-enclosed transmission line (GIL) devices have the advantages of high voltage level and compact structure. In recent years, with the development of high-voltage and large-capacity power transmission in power systems, GIL equipment has been widely used. As a key insulating component in GIL equipment, epoxy resin cast insulators are built into the GIL shell and play the roles of mechanical support, electrical insulation and unit isolation, which are of great significan...

Claims

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Application Information

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IPC IPC(8): H01B19/00H01B19/04B29C39/42B29C35/02B29C71/00B29L31/34B29K63/00
CPCB29C35/02B29C39/42B29C71/0009B29K2063/00B29L2031/3412H01B19/00H01B19/04
Inventor 杜伯学姚航李进梁虎成陈允冉昭玉
Owner TIANJIN UNIV
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