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Nonlinear material-based voltage-sharing electrode in basin type insulator

A nonlinear material, basin-type insulator technology, applied in insulators, circuits, electrical components, etc., can solve problems such as dwell simulation analysis

Inactive Publication Date: 2018-08-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, most of the relevant research is still limited to simulation analysis, and research on the modification of small samples and small samples. The relevant research on new high-voltage DC GIL basin insulators with industrial application potential is still rarely reported.

Method used

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  • Nonlinear material-based voltage-sharing electrode in basin type insulator
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  • Nonlinear material-based voltage-sharing electrode in basin type insulator

Examples

Experimental program
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Effect test

Embodiment 1

[0026] figure 2 It is a schematic diagram of the nonlinear coating resistivity of the voltage equalizing electrode in the pot insulator of the nonlinear material of the present invention changing with the electric field intensity, as figure 2 As shown, the epoxy coating modified by nonlinear material SiC is added to the surface of the central insert of the pot insulator. The coating has the characteristics of resistance nonlinearity, that is, the resistivity of the coating increases with the increase of the electric field intensity , and the rate of increase in resistivity increases. This feature enables a sharp drop in resistivity under high field strength, thereby realizing charge discharge under high field strength.

Embodiment 2

[0028] Apply a voltage of -300kV at the central electrode, image 3 is the electric field modulus distribution diagram of the present invention after applying -300kV voltage at the central electrode place, such as image 3 As shown, the electric field intensity near the embedded central electrode without surface coating is as high as 7kV / mm, while the electric field intensity near the embedded central electrode with surface coating is reduced to the level of 2kV / mm, which can largely Weaken the discharge phenomenon at the center electrode, thereby reducing the surface charge injected from the electrode.

Embodiment 3

[0030] Apply a voltage of -300kV at the central electrode, Figure 4 is the normal electric field modulus distribution diagram of the present invention after applying -300kV voltage at the central electrode; Figure 5 is the tangential electric field modulus distribution diagram of the present invention after applying a -300kV voltage at the central electrode, such as Figure 4 , Figure 5 As shown, the normal electric field strength is reduced from 6.5kV / mm to 2kV / mm, which can reduce the charge adsorption phenomenon on the surface of the pot insulator near the center electrode to a certain extent, thereby reducing the surface charge adsorbed from the space. The tangential electric field is basically unchanged, which can ensure that the surface flashover voltage of the pot insulator does not decrease under the condition of no charge accumulation.

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Abstract

Disclosed is a nonlinear material-based voltage-sharing electrode in a basin type insulator. The voltage-sharing electrode comprises central electrodes, a central embedded part and a ground electrode;the central embedded part is mounted in the connecting position of the two central electrodes; the central embedded part and the ground electrode are connected through an insulator; and a nonlinear material coating layer is arranged between the insulator and the central embedded part and on the exteriors of the central electrodes. Beneficial effects are achieved as follows: the nonlinear materialcoating layer is prepared by adopting a specific nonlinear material formula; in the structure, in the operating process of the basin type insulator in a direct current environment, electric field regulation on the end, close to the central electrodes, of the insulator can be realized by the internal nonlinear material coating layer; in addition, when the surface electric field of the nonlinear material coating layer almost reaches a set electric field distortion value, the surface electric field distribution can be adjusted adaptively; and therefore, according to the electric field intensityin the region, the surface charge accumulation amount at the proximal electrode end can be adjusted adaptively so as to limit the surface charge amount to be within a safe range constantly.

Description

technical field [0001] The invention relates to the field of insulating components of power transmission and distribution equipment, in particular to a voltage equalizing electrode in a basin-type insulator based on nonlinear materials. Background technique [0002] Gas-insulated metal-enclosed transmission line (GIL) has many characteristics such as large transmission capacity, low loss, high safety and environmental friendliness. It is an effective means for large-capacity and long-distance power transmission. In special environments such as dense transmission corridors, dangerous landforms, rivers, lakes and seas, gas-insulated metal-enclosed lines become the best choice for power transmission. At present, although gas-insulated metal-enclosed transmission lines have gradually been widely used in the world, however, they are mainly used in AC power grids, and the application of GIL in DC transmission systems is rarely reported. In recent years, many manufacturing units i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B17/42
CPCH01B17/42
Inventor 胡军何金良李传扬林川杰李琦张波
Owner TSINGHUA UNIV
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