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Device and method for inhibition of charge injection under transient electric field

A technology for suppressing transient and charge injection, applied to circuits, electrical components, conductor/cable insulation, etc., can solve problems such as flashover faults, electric field distortion aggravation, breakdown, etc., to suppress injection, improve insulation life, and improve The effect of starting voltage

Inactive Publication Date: 2018-01-12
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the injection of charges will lead to the intensification of local electric field distortion, which is likely to cause internal breakdown and flashover faults along the surface

Method used

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  • Device and method for inhibition of charge injection under transient electric field

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Comparison scheme
Effect test

Embodiment 1

[0023] An embodiment of the present invention provides a method for suppressing charge injection under a transient electric field, the method comprising the following steps:

[0024] Select a magnesium oxide target with a purity of 99.99% and put it into a magnetron sputtering apparatus, fix the substrate on the base of the magnetron sputtering apparatus for magnetron sputtering, and form a layer of magnesium oxide film on the surface of the substrate;

[0025] Insulate and cover the surface of the base body on the current-carrying module of the high-voltage equipment.

[0026] Before forming an insulating layer on the surface of the current-carrying part of the high-voltage equipment, the target material is a magnesium oxide target with a purity of 99.99%, and a layer of magnesium oxide film is formed on the surface of the substrate by magnetron sputtering coating or evaporation coating, and then, After the high-voltage equipment current-carrying module is insulated and cover...

Embodiment 2

[0028] see figure 1 , an embodiment of the present invention provides a method for suppressing charge injection under a transient electric field, the method comprising the following steps:

[0029] Select a magnesium oxide target with a purity of 99.99% and put it into a magnetron sputtering apparatus, fix the substrate on the base of the magnetron sputtering apparatus for magnetron sputtering, and form a layer of magnesium oxide film on the surface of the substrate;

[0030] Insulate and cover the surface of the base body on the current-carrying module of the high-voltage equipment.

[0031] Optionally, the working mode of the magnetron sputtering apparatus is a pulse excitation source, the sputtering power is 300W, the sputtering chamber is evacuated to 0.35Pa, and high-purity argon gas is introduced into the chamber, and the gas flow rate is set to 35sccm, where sccm means standard milliliter per minute flow.

[0032] Optionally, the sputtering time of the magnetron sputt...

Embodiment 3

[0037] see figure 1 , An embodiment of the present invention provides a device for suppressing charge injection under a transient electric field, including the current-carrying module of a high-voltage equipment that has been insulated and covered according to any one of claims 1-5.

[0038] Optionally, the device includes a high-voltage motor provided with transformer winding insulation, a high-voltage circuit breaker provided with a combination switch and a gas-insulated metal pipe insulator, a medium-high voltage AC-DC bushing or a medium-high voltage AC-DC cable.

[0039]By magnetron sputtering coating or evaporation coating, a layer of magnesium oxide film with a thickness greater than 120nm is formed on the surface of the insulating material or metal conductor, and then, after the insulation covering of the high-voltage equipment current-carrying module module, it can be on the insulating material layer or A layer of dense magnesium oxide film is formed between the metal...

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Abstract

The invention relates to the technical field of power transmission and distribution equipment, in particular to a device and method for inhibition of charge injection under a transient electric field.When a high-voltage electric appliance operates in a transient overvoltage waveform, a local high-voltage electric field enables charge injection into an insulating medium and enables continuous physical processes of charge injection and extraction and the like under the action of external stress, and consequently local electric field distortion is aggravated, and internal breakdown and surface flashover faults can be probably caused. The method for inhibition of charge injection under the transient electric field includes steps: selecting a magnesium oxide target material, and adopting a magnetron sputtering instrument to form a magnesium oxide film on the surface of a substrate; performing insulating coverage on a high-voltage equipment current-carrying module by the aid of the substrate. The electron work function of a metal insulating interface can be increased, the surface secondary electron emission coefficient is increased, and insulating surface flashover starting voltage under a high vacuum condition is raised.

Description

technical field [0001] The present application relates to the technical field of power transmission and distribution equipment, in particular to a method and device for suppressing charge injection under a transient electric field. Background technique [0002] Dielectric composite materials have strong electrical insulation strength, excellent mechanical properties and low cost, and are widely used in the manufacture of insulation parts in the field of power transmission and distribution, as well as the main insulation of various high-voltage electrical equipment. At present, most medium and high-voltage motors and generators use polyimide film to wrap and wind the flat copper wire of the stator winding, and then use alkali-free glass fiber reinforced epoxy mica tape composite insulating material to form the winding. The final stator winding is wrapped, and after hot molding, it is used as the main insulation of the stator winding; the insulators in the gas-insulated electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/06H01B19/04H02K3/32H02K3/30H02K15/10
Inventor 何顺马宏明程志万谭向宇
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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