CN110853848A - Treatment method for improving insulator flashover voltage by atmospheric pressure plasma jet method - Google Patents
Treatment method for improving insulator flashover voltage by atmospheric pressure plasma jet method Download PDFInfo
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Abstract
The invention discloses a processing method for improving flashover voltage of an insulator by an atmospheric pressure plasma jet method, which comprises the following steps of ionizing tetraethyl orthosilicate TEOS mixed gas into plasma in a plasma jet tube, spraying the plasma to the surface of a direct current basin-type insulator to form surface deposition of 500nm-2 mu m, and obtaining high-voltage direct current basin-type insulators with different surface conductivities, wherein the processing method comprises the following specific steps: a quartz glass tube is used as a jet tube main body, a hollow or solid conductor tube is used as a plasma guide tube and an internal high-voltage electrode, and a copper foil is attached to the tail end of the outer side of the jet tube; heating TEOS liquid filled with a precursor; introducing one path of 150-plus 250sccm argon gas into a gas washing bottle, taking out a precursor TEOS molecule into a jet pipe, fully mixing with the other path of 5-7slm argon gas, introducing into the jet pipe, and ionizing to form plasma; and clamping the jet pipe by using a mechanical arm, controlling the jet pipe to jet plasma vertical to the surface of the insulating material and move parallel to the surface of the insulating material, and carrying out plasma treatment on the modified object.
Description
Technical Field
The invention belongs to the field of insulation preparation of high-voltage equipment, and particularly relates to a treatment method for improving flashover voltage of an insulator by an atmospheric pressure plasma jet method.
Background
In recent years, with the development demand of high-voltage and high-capacity power transmission of a power system, gas insulated metal enclosed switchgear (GIS) and gas insulated metal enclosed power transmission lines (GIL) have attracted attention and are widely used due to the advantages of large transmission capacity, small floor area, high reliability and the like. The basin-type insulator plays a role in mechanical support and also plays a decisive key role in the safe and stable operation of the whole GIS and GIL as an electrical insulator. However, even in the +/-800 kV direct-current extra-high voltage project with severe quality, the epoxy casting insulator still has frequent failure.
Generally, when the GIS/GIL operates under direct-current voltage for a long time, a large amount of charges are accumulated on the surface of the basin-type insulator under the condition of extremely high field intensity between the high-voltage guide rod and the grounding metal shell, so that local field intensity of the edge surface of the basin-type insulator is seriously distorted, and the probability of surface flashover is increased. The surface treatment is carried out on the basin-type insulator, the surface conductivity is changed, the dissipation of surface charges is facilitated, the charge accumulation is reduced, the distortion degree of an electric field is reduced, and therefore the generation of surface flashover discharge is restrained. The plasma jet is applied to the surface modification of the high-voltage basin-type insulator, has the advantages of simple and convenient operation, easy control, short treatment time, high treatment accuracy and the like, and provides a brand new method for rapid industrialized surface treatment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a processing method for improving the flashover voltage of an insulator by an atmospheric pressure plasma jet method.
The invention provides a processing method for improving insulator flashover voltage by an atmospheric pressure plasma jet method, which is used for ionizing tetraethyl orthosilicate TEOS mixed gas into plasma in a plasma jet tube and spraying the plasma to the surface of a direct current basin-type insulator to form surface deposition of 500nm-2 mu m and obtain high-voltage direct current basin-type insulators with different surface conductivities, and comprises the following steps:
1) the quartz glass tube is used as a jet tube main body, and the high-voltage electrode and the ground electrode adopt a needle ring electrode structure: a hollow or solid conductor tube is used as a plasma guide tube and an internal high-voltage electrode, and a copper foil is attached to the outer end of the jet tube;
2) a plasma power supply is adopted as an excitation source, the discharge repetition frequency is 25-35kHz, the output voltage amplitude is 4-7kV, and the current is 100-250 mA;
3) heating a gas washing bottle filled with a precursor TEOS liquid in water bath at 60-80 ℃;
4) introducing one path of 150-plus 250sccm argon gas into a gas washing bottle, taking out a precursor TEOS molecule into a jet pipe, fully mixing with the other path of 5-7slm argon gas, introducing into the jet pipe, and ionizing to form plasma;
5) and clamping the jet pipe by using a mechanical arm, controlling the jet pipe to jet plasma vertical to the surface of the insulating material and move parallel to the surface of the insulating material, and carrying out plasma treatment on the modified object.
The solid conductor tube is made of copper.
The solid conductor tube has a diameter of 3mm,
the outer diameter of the hollow conductor tube is 4-14mm, and the thickness of the hollow conductor tube is 1 mm.
The copper foil is 1-1.5cm away from the tail end of the jet pipe.
The jet pipe is composed of a pipe body and electrodes, the pipe body adopts a quartz glass pipe as a pipe body material, the diameter of the pipe body is 1-2cm, and the length of the pipe body is 15-25 cm.
Advantageous effects
1. The high-voltage direct-current basin-type insulator is subjected to surface treatment, so that the surface conductance of a treatment position is increased, the electric field distortion is reduced, and the flashover voltage of the insulator is improved.
2. The surface of the insulator is modified through plasma jet, so that the dissipation of surface charges of the insulator is accelerated, the insulating property of the high-voltage direct-current basin-type insulator is improved, and the operation stability and the safety of a power system are improved.
Drawings
FIG. 1 shows the dissipation of surface charge at different plasma jet treatment times.
Figure 2 shows the flashover voltage of the insulator at different plasma jet treatment times.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
Example 1
A treatment method for improving flashover voltage of an insulator by an atmospheric pressure plasma jet method ionizes tetraethyl orthosilicate TEOS/argon mixed gas into plasma in a plasma jet tube, and the plasma is sprayed to the surface of a direct current basin-type insulator to form surface deposits with different thicknesses, so that high-voltage direct current basin-type insulators with different surface conductivities are obtained, and the treatment method comprises the following steps:
1) the quartz glass tube is used as a jet tube main body, and the high-voltage electrode and the ground electrode adopt a needle ring electrode structure: a round solid copper bar is used as an internal high-voltage electrode, a quartz glass tube is tightly sleeved on the outer side of the round solid copper bar, and a copper foil is attached to the tail end of the outer side of the jet pipe;
2) a plasma power supply is adopted as an excitation source, the discharge repetition frequency of the power supply is 30kHz, the output voltage amplitude is 6kV, and the current is 200 mA;
3) heating a gas washing bottle filled with a precursor TEOS liquid in a water bath at 70 ℃;
4) introducing one path of 200sccm argon gas into a gas washing bottle, taking out a precursor TEOS molecule into a jet pipe, fully mixing the precursor TEOS molecule with the other path of 6slm argon gas, introducing the mixture into the jet pipe, and ionizing to form plasma;
5) and clamping the jet pipe by using a mechanical arm, jetting plasma by the jet pipe in a way of being vertical to the surface of the insulating material, and moving in a way of being parallel to the surface of the insulating material to carry out plasma treatment on the modified object.
The diameter of the solid copper rod is 3mm, the outer diameter of the quartz glass tube sleeved on the copper rod is 4mm, and the distance between the copper foil and the tail end of the jet pipe is 1 cm.
The jet pipe is composed of a pipe body and electrodes, the pipe body adopts a quartz glass pipe as a pipe body material, the diameter of the pipe body is 1cm, and the length of the pipe body is 15 cm.
Example 2
A treatment method for improving flashover voltage of an insulator by an atmospheric pressure plasma jet method ionizes tetraethyl orthosilicate TEOS/argon mixed gas into plasma in a plasma jet tube, and the plasma is sprayed to the surface of a direct current basin-type insulator to form surface deposits with different thicknesses, so that high-voltage direct current basin-type insulators with different surface conductivities are obtained, and the treatment method comprises the following steps:
1) the quartz glass tube is used as a jet tube main body, and the high-voltage electrode and the ground electrode adopt a needle ring electrode structure: a round solid copper bar is used as an internal high-voltage electrode, a quartz glass tube is tightly sleeved on the outer side of the round solid copper bar, and a copper foil is attached to the tail end of the outer side of the jet pipe;
2) a plasma power supply is adopted as an excitation source, the discharge repetition frequency of the power supply is 25kHz, the output voltage amplitude is 4kV, and the current is 100 mA;
3) heating a gas washing bottle filled with a precursor TEOS liquid in a water bath at 60 ℃;
4) introducing one path of argon gas of 150sccm into a gas washing bottle, taking out a precursor TEOS molecule into a jet pipe, fully mixing with the other path of argon gas of 5slm, introducing into the jet pipe, and ionizing to form plasma;
5) and clamping the jet pipe by using a mechanical arm, jetting plasma by the jet pipe in a way of being vertical to the surface of the insulating material, and moving in a way of being parallel to the surface of the insulating material to carry out plasma treatment on the modified object.
The diameter of the solid copper rod is 3mm, the outer diameter of the hollow conductor pipe is 6mm, and the distance between the copper foil and the tail end of the jet pipe is 1.5 cm.
The jet pipe comprises a pipe body and an electrode, wherein the pipe body adopts a quartz glass pipe as a pipe body material, the diameter of the pipe body is 2cm, and the length of the pipe body is 25 cm.
Example 3
A treatment method for improving flashover voltage of an insulator by an atmospheric pressure plasma jet method ionizes tetraethyl orthosilicate TEOS/argon mixed gas into plasma in a plasma jet tube, and the plasma is sprayed to the surface of a direct current basin-type insulator to form surface deposits with different thicknesses, so that high-voltage direct current basin-type insulators with different surface conductivities are obtained, and the treatment method comprises the following steps:
1) the quartz glass tube is used as a jet tube main body, and the high-voltage electrode and the ground electrode adopt a needle ring electrode structure: a round solid copper bar is used as an internal high-voltage electrode, a quartz glass tube is tightly sleeved on the outer side of the round solid copper bar, and a copper foil is attached to the tail end of the outer side of the jet pipe;
2) a plasma power supply is adopted as an excitation source, the discharge repetition frequency of the power supply is 35kHz, the output voltage amplitude is 7kV, and the current is 250 mA;
3) heating a gas washing bottle filled with a precursor TEOS liquid in a water bath at 80 ℃;
4) introducing one path of 250sccm argon gas into a gas washing bottle, taking out a precursor TEOS molecule into a jet pipe, fully mixing with the other path of 7slm argon gas, introducing into the jet pipe, and ionizing to form plasma;
5) and clamping the jet pipe by using a mechanical arm, jetting plasma by the jet pipe in a way of being vertical to the surface of the insulating material, and moving in a way of being parallel to the surface of the insulating material to carry out plasma treatment on the modified object.
The diameter of the solid copper rod is 3mm, the outer diameter of the hollow conductor pipe is 14mm, and the distance between the copper foil and the tail end of the jet pipe is 1.5 cm.
The jet pipe comprises a pipe body and an electrode, wherein the pipe body adopts a quartz glass pipe as a pipe body material, the diameter of the pipe body is 1.5cm, and the length of the pipe body is 25 cm.
Although the preferred embodiments of the present invention have been described, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make various modifications without departing from the spirit and scope of the present invention, which falls within the protection scope of the present invention.
Claims (6)
1. A treatment method for improving insulator flashover voltage by an atmospheric pressure plasma jet method is characterized in that tetraethyl orthosilicate TEOS mixed gas is ionized into plasma in a plasma jet tube and is jetted to the surface of a direct current basin-type insulator to form surface deposition of 500nm-2 mu m, so that high-voltage direct current basin-type insulators with different surface conductivities are obtained, and the treatment method comprises the following steps:
1) the quartz glass tube is used as a jet tube main body, and the high-voltage electrode and the ground electrode adopt a needle ring electrode structure: a hollow or solid conductor tube is used as a plasma guide tube and an internal high-voltage electrode, and a copper foil is attached to the outer end of the jet tube;
2) a plasma power supply is adopted as an excitation source, the discharge repetition frequency is 25-35kHz, the output voltage amplitude is 4-7kV, and the current is 100-250 mA;
3) heating a gas washing bottle filled with a precursor TEOS liquid in water bath at 60-80 ℃;
4) introducing one path of 150-plus 250sccm argon gas into a gas washing bottle, taking out a precursor TEOS molecule into a jet pipe, fully mixing with the other path of 5-7slm argon gas, introducing into the jet pipe, and ionizing to form plasma;
5) and clamping the jet pipe by using a mechanical arm, controlling the jet pipe to jet plasma vertical to the surface of the insulating material and move parallel to the surface of the insulating material, and carrying out plasma treatment on the modified object.
2. The method of claim 1, wherein the solid conductor tube is made of copper.
3. The method for improving insulator flashover voltage by the atmospheric pressure plasma jet method according to claim 1, wherein the diameter of the solid conductor tube is 3 mm.
4. The method for processing the insulator flashover voltage by the atmospheric pressure plasma jet method according to claim 1, wherein the hollow conductor tube has an outer diameter of 4-14mm and a thickness of 1 mm.
5. The treatment method for improving the flashover voltage of the insulator by the atmospheric pressure plasma jet method according to claim 1, wherein the copper foil is 1-1.5cm away from the tail end of the jet pipe.
6. The treatment method for improving the flashover voltage of the insulator by the atmospheric pressure plasma jet method according to claim 1, wherein the jet pipe is composed of a pipe body and electrodes, the pipe body adopts a quartz glass pipe as a pipe body material, the diameter of the pipe body is 1-2cm, and the length of the pipe body is 15-25 cm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114496430A (en) * | 2022-02-14 | 2022-05-13 | 南京工业大学 | Surface crack accurate repairing device and method based on plasma jet |
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| CN107333376A (en) * | 2017-04-21 | 2017-11-07 | 南京航空航天大学 | A kind of atomic plasma jet generating device of atmospheric pressure |
| CN109830348A (en) * | 2019-01-29 | 2019-05-31 | 天津大学 | A kind of high voltage direct current disc insulator fast industrialization surface conductivity processing method |
| CN109830347A (en) * | 2019-01-29 | 2019-05-31 | 天津大学 | The high voltage direct current GIL quick industrial processing method of surface function gradient insulator |
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- 2019-11-18 CN CN201911126832.7A patent/CN110853848A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006253495A (en) * | 2005-03-11 | 2006-09-21 | Sumitomo Heavy Ind Ltd | Surface cleaning device and cleaning method |
| KR20110027396A (en) * | 2009-09-10 | 2011-03-16 | 주성엔지니어링(주) | Apparatus and method for plasma processing |
| CN205726632U (en) * | 2016-04-18 | 2016-11-23 | 浙江大学 | A kind of brush low-temperature plasma jet device of band porous media |
| CN107333376A (en) * | 2017-04-21 | 2017-11-07 | 南京航空航天大学 | A kind of atomic plasma jet generating device of atmospheric pressure |
| CN109830348A (en) * | 2019-01-29 | 2019-05-31 | 天津大学 | A kind of high voltage direct current disc insulator fast industrialization surface conductivity processing method |
| CN109830347A (en) * | 2019-01-29 | 2019-05-31 | 天津大学 | The high voltage direct current GIL quick industrial processing method of surface function gradient insulator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114496430A (en) * | 2022-02-14 | 2022-05-13 | 南京工业大学 | Surface crack accurate repairing device and method based on plasma jet |
| CN114496430B (en) * | 2022-02-14 | 2023-06-02 | 南京工业大学 | Accurate surface crack repairing device and method based on plasma jet |
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