CN113628816B - GIL/GIS metal particle lifting inhibition method based on insulator surface layer function gradient modification - Google Patents
GIL/GIS metal particle lifting inhibition method based on insulator surface layer function gradient modification Download PDFInfo
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Abstract
The invention discloses a GIL/GIS metal particle lifting inhibition method based on insulator surface layer function gradient modification. Based on the epoxy resin insulator surface layer functional gradient optimization design, the epoxy resin insulator is subjected to surface layer functional gradient modification by utilizing a fluorination treatment technology, so that the epoxy resin insulator with the surface layer functional gradient modification is obtained. The high-voltage direct current GIL/GIS system provided with the surface layer functional gradient modified epoxy resin insulator can reduce the axial gradient force required by the movement of metal particles to the weak insulation position, and has an obvious inhibiting effect on the lifting of the metal particles with different shapes at different positions away from the epoxy resin insulator. The surface layer function gradient modification treatment is carried out on the epoxy resin insulator, so that the inhibition of the movement of metal particles in a GIL/GIS system is realized. Has important value and significance for treating metal particle pollution in high-voltage direct current GIL/GIS.
Description
Technical Field
The invention relates to the field of high-voltage power transmission of electrical engineering, in particular to a GIL/GIS metal particle lifting inhibition method based on insulator surface layer function gradient modification.
Background
When the high-voltage direct-current GIL/GIS runs for a long time, the charge accumulation poles on the surface of a common basin-type insulator or a support insulator are uneven, and the axial gradient force of an electric field moving to the surface of the insulator is generated on nearby metal particles, so that the metal particles nearby the insulator easily move to the surface of the insulator, finally, insulation faults such as air gap breakdown, partial discharge, surface flashover and the like are caused, and the insulation performance of the high-voltage direct-current GIL/GIS is seriously deteriorated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a GIL/GIS metal particle lifting inhibition method based on epoxy resin insulator surface layer function gradient modification, and provides a new treatment idea in the aspect of metal particle movement treatment in a high-voltage direct-current GIL/GIS.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows, wherein the method for inhibiting the lifting of the metal particles of the GIL/GIS based on the functional gradient modification of the surface layer of the insulator comprises the following steps:
(1) The surface of the epoxy resin insulator is divided into three areas based on the surface potential distribution of the epoxy resin insulator (including a basin insulator/a post insulator) under the GIL/GIS operation working condition of high-voltage direct current (including +/-160 kV, + 200kV, + 320kV, + 550kV, + 800 kV). Before the epoxy resin insulator is installed, the polytetrafluoroethylene anti-corrosion adhesive tape for the second region and the third region is adhered. Placing the insulator in a reaction kettle, and filling the insulator into the reaction kettle in a volume ratio of 1: 10-1: 1, the temperature of reaction gas is 10-50 ℃, the gas pressure is 0.01-0.1 Mpa, the surface layer structure modification treatment is carried out on the epoxy resin insulator for 15-30min, and the surface conductivity of the first area after the modification treatment is 5.02 multiplied by 10 -14 S-5.05×10 - 14 S。
(2) And removing the polytetrafluoroethylene corrosion-resistant adhesive tape in the third area, and putting the insulator into a reaction kettle for fluorination treatment of the surface layer structure for 15-30min to obtain the epoxy resin insulator with the surface layer modified in a functional gradient manner. The surface conductivity of the epoxy resin insulator modified by the surface layer functional gradient is distributed in a gradient manner, wherein the surface conductivity of the first region: 6.50X 10 -13 S-6.55×10 - 13 S, surface conductivity of the second region: 5.80X 10 -15 S-5.85×10 -15 S, regional three-surface conductivity: 5.02X 10 -14 S-5.05×10 -14 S。
(3) And (2) carrying out rated direct current voltage prepressing for 1-10 hours on the high-voltage direct current GIL/GIS system provided with the surface layer functional gradient modified epoxy resin insulator, and testing the starting voltage of metal particles (including spherical metal particles, linear metal particles and metal dust) at different positions away from the convex surface of the epoxy resin insulator after the prepressing is finished.
Furthermore, the voltage grades involved in the high-voltage direct current GIL/GIS include +/-160 kV, + 200kV, + 320kV, + 550kV, + 800kV.
Furthermore, the epoxy resin insulator comprises a basin-type insulator and a post insulator.
Further, the metal fine particles include spherical metal fine particles, linear metal fine particles, and metal powder.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
according to the invention, the surface layer function gradient of the epoxy resin insulator is modified, the electric field distribution of the insulator under the operation working condition is optimized, the electric field axial gradient force generated by the metal particles moving to the surface of the insulator is weakened, and the inhibition of the movement of the metal particles in the high-voltage direct current GIL/GIS is further realized. The surface layer function gradient modified insulator manufacturing process flow is simple and reliable, the original mechanical structure of the high-voltage direct current GIL/GIS is not required to be changed, and the popularization and application of the high-voltage direct current GIL/GIS are facilitated.
According to the manufacturing scheme, the basin-type insulator surface conductivity subjected to surface functional gradient modification is in gradient distribution, the surface charge distribution of the basin-type insulator under the long-term operation condition is optimized, the axial gradient force of an electric field required by movement of metal particles to an insulation weak position is reduced, and the effect of obviously inhibiting the lifting of the metal particles at different positions away from the insulator is achieved. Therefore, the design and manufacture of the surface layer functional gradient modified basin-type insulator with the function of inhibiting the movement of metal particles in the high-voltage direct current GIL/GIS have practical significance for treating the metal particle pollution in the high-voltage direct current GIL/GIS.
Drawings
In order to clearly illustrate the implementation of the technical solution of the present invention, the drawings required in the description of the implementation are briefly introduced below. The following drawings are illustrative only and are not limiting.
FIG. 1 is a schematic diagram of a design of a +/-160 kV basin-type insulator with functionally graded modification on the surface;
FIG. 2 is a graph comparing the results of the lift voltages of metal particles at different positions of the convex surface of a conventional basin insulator and a basin insulator with functionally gradient modified surface layer installed in a + -160 kV DC GIL/GIS.
Detailed Description
The invention is further described in detail with reference to the following figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
The invention relates to a GIL/GIS metal particle lifting inhibition method based on basin-type insulator surface structure gradient modification, which utilizes a surface structure gradient modification technology to carry out gradient structure modification on the surface of a basin-type insulator, compared with the common basin-type insulator, the surface charge distribution of the basin-type insulator with high conductivity surface structure gradient modification is more uniform under the long-term operation condition, the axial gradient force of an electric field required by the movement of metal particles to the basin-type insulator is fundamentally reduced, and the inhibition of the movement of high-voltage direct-current GIL/GIS metal particles is realized.
The specific process flow of the basin-type insulator surface function gradient fluorination treatment is as follows:
(1) The surface layer of the basin-type insulator is divided into three areas based on electric field distribution of the epoxy resin basin-type insulator in actual operation, wherein the surface layer structure modification treatment is carried out on the area I and the area III at different time, and the surface layer structure modification treatment is not carried out on the area II.
(2) Adhering the polytetrafluoroethylene corrosion-resistant adhesive tapes for the second region and the third region, then placing the epoxy resin basin-type insulator in a vacuum fluorination reaction kettle, and filling the reaction kettle with a volume ratio of 1:6, mixing fluorine gas and nitrogen gas, and reacting under the following conditions: the first zone of the epoxy resin basin-type insulator is processed at the gas temperature of 10 ℃ and the gas pressure of 0.04MpaSurface layer structure modification treatment for 15min, wherein the surface conductivity of the modified surface structure of the first region after the modification treatment is 5.02 multiplied by 10 -14 S-5.05×10 -14 S。
(3) Removing the polytetrafluoroethylene corrosion-resistant adhesive tape in the third area, putting the epoxy resin basin-type insulator into a vacuum fluorination reaction kettle for 15min to carry out surface structure treatment, and obtaining the surface conductivity of the first area after the surface structure modification treatment: 6.50X 10 -13 S-6.55×10 -13 S, surface conductivity of the second region: 5.80X 10 -15 S-5.85×10 -15 S, regional three-surface conductivity: 5.02X 10 -14 S-5.05×10 -14 S, the surface layer structure gradient modified basin-type insulator has the function of inhibiting the high-voltage direct current GIL/GIS metal particle lifting.
(4) And analyzing the lifting inhibition effect of the gradient modified basin-type insulator with the high-conductivity surface layer on the concave-convex surface and the metal particles at different positions away from the insulator under different operating conditions by using a scaling direct current GIL/GIS system.
(5) According to the experimental result, compared with the common GIL/GIS basin-type insulator, the GIL/GIS basin-type insulator with the surface structure modified in the gradient way has obvious inhibition effect on the movement of metal particles at different positions, as shown in figure 2.
Example 2
The invention relates to a GIL/GIS metal particle lifting inhibition method based on the gradient modification of a surface layer structure of a post insulator, which utilizes the surface layer structure gradient modification technology to carry out the gradient structure modification on the surface of the post insulator, compared with the common post insulator, the surface charge distribution of the high-conductivity surface structure gradient modified post insulator is more uniform under the long-term operation condition, the axial gradient force of an electric field required by the movement of metal particles to the post insulator is radically reduced, and the inhibition of the movement of high-voltage direct-current GIL/GIS metal particles is realized.
The specific process flow of the functional gradient fluorination treatment on the surface of the pillar insulator is as follows:
1) The surface layer of the post insulator is divided into three areas based on the electric field distribution of the epoxy resin post insulator in actual operation, wherein the surface layer structure modification treatment is carried out on the area I and the area III at different time, and the surface layer structure modification treatment is not carried out on the area II.
2) Adhering the polytetrafluoroethylene corrosion-resistant adhesive tapes for the second region and the third region, then placing the epoxy resin post insulator in a vacuum fluorination reaction kettle, and filling the reaction kettle with a volume ratio of 1:10, mixing fluorine gas and helium gas, and reacting under the following conditions: carrying out surface layer structure modification treatment on the first region of the epoxy resin post insulator for 25min at the gas temperature of 30 ℃ and the gas pressure of 0.1Mpa, wherein the surface conductivity of the modified first region is 5.02 multiplied by 10 after the surface structure modification -14 S-5.05×10 -14 S。
3) Removing the polytetrafluoroethylene corrosion-resistant adhesive tape in the third area, putting the epoxy resin post insulator into a vacuum fluorination reaction kettle for 30min to carry out surface structure treatment, and obtaining the surface conductivity of the first area after the surface structure modification treatment: 6.50X 10 -13 S-6.55×10 -13 S, surface conductivity of the second region: 5.80X 10 -15 S-5.85×10 -15 S, regional three-surface conductivity: 5.02X 10 -14 S-5.05×10 -14 S, the surface structure gradient modified post insulator has the function of inhibiting the high-voltage direct current GIL/GIS metal particle lifting.
4) And analyzing the lifting inhibition effect of the gradient modified post insulator with the high-conductivity surface layer on the concave-convex surface and the metal particles at different positions away from the insulator under different operating conditions by using a scaling direct current GIL/GIS system.
Example 3
1) Dividing the surface of the epoxy resin insulator into three areas based on the surface potential distribution of the epoxy resin insulator under the high-voltage direct current GIL/GIS operation condition;
2) Before the epoxy resin insulator is installed, adhering the polytetrafluoroethylene anti-corrosion adhesive tapes used for the second region and the third region;
3) Placing the insulator in a reaction kettle, and filling the insulator into the reaction kettle in a volume ratio of 1:1, carrying out surface layer structure modification treatment on the epoxy resin insulator for 15min at the reaction gas temperature of 10 ℃ and the gas pressure of 0.01MPa, wherein the surface conductivity of the first region after the modification treatment is 5.02 multiplied by 10 -14 S-5.05×10 -14 S；
4) Removing the polytetrafluoroethylene corrosion-resistant adhesive tape in the third area, and putting the insulator into a reaction kettle for fluorination treatment of a surface layer structure for 15-30min to obtain an epoxy resin insulator with a surface layer modified in a functional gradient manner;
the surface conductivity of the epoxy resin insulator with the surface layer modified in a functional gradient manner is distributed in a gradient manner, wherein the surface conductivity of the first region is as follows: 6.50X 10 -13 S-6.55×10 -13 S, surface conductivity of the second region: 5.80X 10 -15 S-5.85×10 -15 S, regional three-surface conductivity: 5.02X 10 -14 S-5.05×10 -14 S。
Example 4
1) Dividing the surface of the epoxy resin insulator into three areas based on the surface potential distribution of the epoxy resin insulator under the high-voltage direct-current GIL/GIS operation condition;
2) Before the epoxy resin insulator is installed, adhering the polytetrafluoroethylene anti-corrosion adhesive tapes used for the second region and the third region;
3) Placing the insulator in a reaction kettle, and filling the insulator into the reaction kettle in a volume ratio of 1:6, carrying out surface layer structure modification treatment on the epoxy resin insulator for 30min at the reaction gas temperature of 50 ℃ and the gas pressure of 0.1MPa, wherein the surface conductivity of the first region after the modification treatment is 5.02 multiplied by 10 -14 S-5.05×10 -14 S；
4) Removing the polytetrafluoroethylene corrosion-resistant adhesive tape in the third area, and putting the insulator into a reaction kettle for fluorination treatment of a surface layer structure for 15-30min to obtain an epoxy resin insulator with a surface layer modified in a functional gradient manner;
the surface conductivity of the epoxy resin insulator with the surface layer modified in a functional gradient manner is distributed in a gradient manner, wherein the surface conductivity of the first region is as follows: 6.50X 10 -13 S-6.55×10 -13 S, surface conductivity of the second region: 5.80X 10 -15 S-5.85×10 -15 S, regional three-surface conductivity: 5.02X 10 -14 S-5.05×10 -14 S；
4) And (3) carrying out 10-hour rated direct-current voltage prepressing on the high-voltage direct-current GIL/GIS system provided with the surface layer functional gradient modified epoxy resin insulator, and testing the metal particle lifting voltage at different positions away from the convex surface of the epoxy resin insulator after the prepressing is finished.
Example 5
1) Dividing the surface of the epoxy resin insulator into three areas based on the surface potential distribution of the epoxy resin insulator under the high-voltage direct current GIL/GIS operation condition;
2) Before the epoxy resin insulator is installed, adhering the polytetrafluoroethylene corrosion-resistant adhesive tapes for the second region and the third region;
3) Placing the insulator in a reaction kettle, and filling the insulator into the reaction kettle in a volume ratio of 1:8, the temperature of reaction gas is 30 ℃, and the gas pressure is 0.05Mpa, the epoxy resin insulator is subjected to surface layer structure modification treatment for 20min, and the surface conductivity of the first region after the modification treatment is 5.02 multiplied by 10 -14 S-5.05×10 -14 S；
4) Removing the polytetrafluoroethylene corrosion-resistant adhesive tape in the third area, and putting the insulator into a reaction kettle for fluorination treatment of a surface layer structure for 15-30min to obtain an epoxy resin insulator with a surface layer modified in a functional gradient manner;
the surface conductivity of the epoxy resin insulator modified by the surface layer functional gradient is distributed in a gradient manner, wherein the surface conductivity of the first region: 6.50X 10 -13 S-6.55×10 -13 S, surface conductivity of the second region: 5.80X 10 -15 S-5.85×10 -15 S, regional three-surface conductivity: 5.02X 10 -14 S-5.05×10 -14 S；
4) And (3) carrying out rated direct-current voltage prepressing for 1-10 hours on the high-voltage direct-current GIL/GIS system provided with the surface layer functional gradient modified epoxy resin insulator, and testing the metal particle starting voltage at different positions away from the convex surface of the epoxy resin insulator after the prepressing is finished.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A GIL/GIS metal particle lift inhibition method based on insulator surface layer function gradient modification is characterized by comprising the following steps
1) Dividing the surface of the epoxy resin insulator into three areas based on the surface potential distribution of the epoxy resin insulator under the high-voltage direct current GIL/GIS operation condition;
2) Before the epoxy resin insulator is installed, adhering the polytetrafluoroethylene corrosion-resistant adhesive tapes for the second region and the third region;
3) Placing the insulator in a reaction kettle, and filling the insulator into the reaction kettle in a volume ratio of 1: 10-1: 1, the temperature of reaction gas is 10-50 ℃, the gas pressure is 0.01-0.1 Mpa, the surface layer structure modification treatment is carried out on the epoxy resin insulator for 15-30min, and the surface conductivity of the first area after the modification treatment is 5.02 multiplied by 10 -14 S-5.05×10 - 14 S；
4) Removing the polytetrafluoroethylene corrosion-resistant adhesive tape in the third area, and putting the insulator into a reaction kettle for fluorination treatment of a surface layer structure for 15-30min to obtain an epoxy resin insulator with a surface layer modified in a functional gradient manner;
the surface conductivity of the epoxy resin insulator with the surface layer modified in a functional gradient manner is distributed in a gradient manner, wherein the surface conductivity of the first region is as follows: 6.50X 10 -13 S-6.55×10 -13 S, surface conductivity of the second region: 5.80X 10 -15 S-5.85×10 -15 S, conductivity of surface of region: 5.02X 10 -14 S-5.05×10 -14 S；
4) And (3) carrying out rated direct current voltage prepressing for 1-10 hours on the high-voltage direct current GIL/GIS system provided with the surface layer functional gradient modified epoxy resin insulator, and testing the metal particle lifting voltage at different positions away from the convex surface of the epoxy resin insulator after the prepressing is finished.
2. The method for inhibiting the initiation of the GIL/GIS metal particles based on the functional gradient modification of the surface layer of the insulator, as claimed in claim 1, is characterized in that the inert gas is selected from nitrogen, argon or helium.
3. The method for inhibiting lifting of GIL/GIS metal particles based on insulator surface layer function gradient modification of claim 1, wherein the test metal particles comprise spherical metal particles, linear metal particles and metal dust.
4. The method for inhibiting initiation of metal particles in GIL/GIS based on insulator surface layer function gradient modification according to claim 1, wherein the voltage classes involved in high voltage direct current GIL/GIS include +/-160 kV, + 200kV, + 320kV, + 550kV, + 800kV.
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