Processing method for improving insulator flashover voltage through atmospheric pressure plasma jet method

A plasma and flashover voltage technology, applied in the direction of insulators, circuits, electrical components, etc., can solve the problems of pot insulator local field strength distortion along the surface, frequent insulator failures, increased flashover along the surface, etc., to improve operation stability performance, increase the flashover voltage, and reduce the effect of electric field distortion

Inactive Publication Date: 2020-02-28
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even in the demanding ±800kV DC UHV project, epoxy cast insulators still have frequent failures
[0003] It is generally believed that when GIS / GIL is operated under DC voltage for a long time, the surface of the pot insulator will accumulate a large amount of charge under the extremely large field strength between the high-voltage guide rod and the grounded metal shell, resulting in serious local field distortion along the surface of the pot insulator , thus increasing the probability of flashover along the surface

Method used

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  • Processing method for improving insulator flashover voltage through atmospheric pressure plasma jet method
  • Processing method for improving insulator flashover voltage through atmospheric pressure plasma jet method

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Effect test

Embodiment 1

[0023] A treatment method for improving the flashover voltage of insulators by atmospheric pressure plasma jet method, ionizing tetraethyl orthosilicate TEOS / argon mixed gas in the plasma jet tube to generate plasma, spraying it onto the surface of DC basin insulators to form different thicknesses The surface deposition of different surface conductivities to obtain high-voltage DC basin insulators, including the following steps:

[0024] 1) Use a quartz glass tube as the main body of the jet tube. The high-voltage electrode and the ground electrode adopt a needle ring electrode structure: use a round solid copper rod as the internal high-voltage electrode, and tightly cover a quartz glass tube on the outside, and use copper foil to stick to the jet tube. the outer end of the tube;

[0025] 2) The plasma power supply is used as the excitation source, the discharge repetition frequency of the power supply is 30kHz, the output voltage amplitude is 6kV, and the current is 200mA; ...

Embodiment 2

[0032] A treatment method for improving the flashover voltage of insulators by atmospheric pressure plasma jet method, ionizing tetraethyl orthosilicate TEOS / argon mixed gas in the plasma jet tube to generate plasma, spraying it onto the surface of DC basin insulators to form different thicknesses The surface deposition of different surface conductivities to obtain high-voltage DC basin insulators, including the following steps:

[0033] 1) Use a quartz glass tube as the main body of the jet tube. The high-voltage electrode and the ground electrode adopt a needle ring electrode structure: use a round solid copper rod as the internal high-voltage electrode, and tightly cover a quartz glass tube on the outside, and use copper foil to stick to the jet tube. the outer end of the tube;

[0034] 2) The plasma power supply is used as the excitation source, the discharge repetition frequency of the power supply is 25kHz, the output voltage amplitude is 4kV, and the current is 100mA; ...

Embodiment 3

[0041] A treatment method for improving the flashover voltage of insulators by atmospheric pressure plasma jet method, ionizing tetraethyl orthosilicate TEOS / argon mixed gas in the plasma jet tube to generate plasma, spraying it onto the surface of DC basin insulators to form different thicknesses The surface deposition of different surface conductivities to obtain high-voltage DC basin insulators, including the following steps:

[0042] 1) Use a quartz glass tube as the main body of the jet tube. The high-voltage electrode and the ground electrode adopt a needle ring electrode structure: use a round solid copper rod as the internal high-voltage electrode, and tightly cover a quartz glass tube on the outside, and use copper foil to stick to the jet tube. the outer end of the tube;

[0043] 2) The plasma power supply is used as the excitation source, the discharge repetition frequency of the power supply is 35kHz, the output voltage amplitude is 7kV, and the current is 250mA; ...

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Abstract

The invention discloses a processing method for improving insulator flashover voltage through an atmospheric pressure plasma jet method. The method comprises steps of ionizing tetraethyl orthosilicateTEOS mixed gas in a plasma jet pipe to obtain plasmas; the plasmas are sprayed to a surface of a direct-current basin-type insulator to form surface deposition of 500nm-2mu m to obtain a high-voltagedirect-current basin-type insulator with different conductivities, specifically, a quartz glass tube is used as a jet tube body, a hollow or solid conductor tube is used as a plasma guide tube and aninternal high-voltage electrode, and a copper foil is attached to a tail end of an outer side of the jet tube; the TEOS liquid filled with the precursor is heated; one path of 150-250sccm argon is introduced into a gas washing bottle, the precursor TEOS molecules are brought into a jet pipe, the precursor TEOS molecules are fully mixed with the other path of 5-7slm argon, the mixture is introduced into the jet pipe, and the plasmas are formed through ionization. The method is advantaged in that a mechanical arm is adopted to clamp the jet pipe, the jet pipe is controlled to spray the plasmasperpendicular to a surface of an insulating material and move parallel to a surface of the insulating material, and a modified object is subjected to plasma treatment.

Description

technical field [0001] The invention belongs to the field of insulation preparation for high-voltage equipment, and in particular relates to a treatment method for improving the flashover voltage of insulators by an atmospheric pressure plasma jet method. Background technique [0002] In recent years, with the development of high-voltage and large-capacity power transmission in power systems, gas-insulated metal-enclosed switchgear (GIS) and gas-insulated metal-enclosed transmission lines (GIL) have advantages, has been widely concerned and applied. Among them, the pot insulator not only plays the role of mechanical support, but also acts as an electrical insulator, which plays a decisive key role in the safe and stable operation of the entire GIS and GIL. However, even in the demanding ±800kV DC UHV project, epoxy cast insulators still have frequent failures. [0003] It is generally believed that when GIS / GIL is operated under DC voltage for a long time, the surface of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B19/04
CPCH01B19/04
Inventor 杜伯学刘浩梁冉昭玉王国利傅明利王婷婷廖一帆罗兵
Owner TIANJIN UNIV
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