CN114709034A - GIS/GIL (gas insulated switchgear/gas insulated switchgear) surface electric field regulation and self-diagnosis method based on functional gradient coating - Google Patents
GIS/GIL (gas insulated switchgear/gas insulated switchgear) surface electric field regulation and self-diagnosis method based on functional gradient coating Download PDFInfo
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- CN114709034A CN114709034A CN202210247711.3A CN202210247711A CN114709034A CN 114709034 A CN114709034 A CN 114709034A CN 202210247711 A CN202210247711 A CN 202210247711A CN 114709034 A CN114709034 A CN 114709034A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
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- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
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- C08K2003/3036—Sulfides of zinc
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Abstract
The invention discloses a GIS/GIL (geographic information System/general information acquisition) surface electric field regulation and self-diagnosis method based on a functional gradient coating, which mainly comprises the following steps: performing gradient optimization design on the surface of the GIS/GIL basin-type insulator, dividing the surface of the whole basin-type insulator into 3-8 annular regions along the radial direction, and sequentially reducing the relative dielectric constant of the coating material selected by each annular region; mixing an epoxy resin matrix with zinc sulfide filler doped with different metals to prepare composite materials with different dielectric constants; attaching a plurality of dielectric constant gradient regions on the surface of the GIS/GIL basin-type insulator according to the design; and finally, self-diagnosing the electric field optimization effect according to the light intensity distribution on the surface of the basin-type insulator under the normal working voltage. The method has important application value in the aspects of optimizing the gas-solid-interface electric field of the GIS/GIL basin-type insulator and improving the stability of a power transmission system.
Description
Technical Field
The invention belongs to the field of high-voltage equipment insulation, and particularly relates to a GIS/GIL surface electric field regulation and self-diagnosis method based on a functional gradient coating.
Background
In recent years, the GIS/GIL power transmission technology has become a research hotspot and development direction in the field of current extra-high voltage power transmission due to the advantages of high transmission voltage level, large transmission capacity, stable operation, small electric energy loss and the like. The basin-type insulator is a core component in the GIS/GIL, and plays roles of mechanical support, electrical insulation and gas isolation, the GIS/GIL has obvious electric field distortion at the gas-solid interface of the basin-type insulator in the operation process, the problems of insulation faults such as local discharge, air gap breakdown, surface flashover and the like are easily caused due to overhigh local electric field intensity, and the faults caused by the electric field distortion at the gas-solid interface can greatly weaken the insulation strength of the GIS/GIL and seriously affect the operation stability of the whole GIS/GIL system.
Aiming at the problem of insulation failure caused by uneven distribution of the gas-solid interface electric field of the basin-type insulator, two solutions mainly exist, one solution realizes optimization of the gas-solid interface electric field distribution by optimizing the electrode and insulation structure of the GIS/GIL; the other scheme is that the formula or the preparation process of the existing insulator is improved, for example, nano-filler is introduced in the preparation process of the insulator so as to achieve the purpose of adjusting and controlling the dielectric constant distribution and optimizing the electric field distribution. But has certain limitation on how to assess the optimization effect of the surface electric field of the basin-type insulator. Aiming at the limitation, the invention provides a GIS/GIL surface electric field regulation and self-diagnosis method based on a functional gradient coating.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a GIS/GIL surface electric field regulation and self-diagnosis method based on a functional gradient coating.
The invention provides a GIS/GIL surface electric field regulation and self-diagnosis method based on a functional gradient coating, which is characterized in that zinc sulfide with electroluminescence characteristic is selected, an epoxy resin matrix and zinc sulfide fillers of different metals are mixed to prepare a composite material with different dielectric constants, and a plurality of designed dielectric constant gradient regions are attached to the surface of a GIS/GIL basin-type insulator, so that the electric field distribution of a gas-solid interface under an operation condition can be optimized, and the electric field optimization effect is self-diagnosed according to the light intensity distribution under the voltage of the gas-solid interface.
The technical scheme provided by the invention is a GIS/GIL (geographic information System/graphic information System) edge electric field regulation and self-diagnosis method based on a functional gradient coating, the surface of a basin-type insulator is divided into 3-8 annular regions along the radial direction according to the insulator edge electric field distribution result, each annular region is coated with epoxy resin/zinc sulfide composite materials with different dielectric constants, the light intensity distribution of the surface of the running basin-type insulator is detected, and the gradient optimization effect of the surface of the insulator is evaluated according to the detection result of the light intensity distribution.
Specifically, the epoxy resin/zinc sulfide composite material for GIS/GIL gas-solid interface electric field regulation and self-diagnosis has electroluminescent characteristics.
The optimization effect of the basin-type insulator surface electric field is examined, and the optimal selection parameters are as follows:
specifically, the relative dielectric constant of the epoxy resin/zinc sulfide composite material for GIS/GIL surface electric field regulation and self-diagnosis is controlled to be 7-15.
Specifically, the functional gradient region of the basin-type insulator for GIS/GIL surface electric field regulation and self-diagnosis is divided into 3-8 annular regions along the radial direction.
The method comprises the following steps:
(1) mixing epoxy resin, a curing agent and an alumina filler according to a mass ratio of 100:33:330, pouring the mixture into a basin-type insulator mold, and preparing a basin-type insulator sample;
(2) dividing the surface of the basin-type insulator into 3-8 annular regions in the radial direction based on the surface electric field distribution of the basin-type insulator under actual working conditions, wherein the annular regions are respectively marked as n1、n2、n3...；
(3) Uniformly mixing epoxy resin and zinc sulfide filler doped with different metals to prepare a plurality of epoxy resin/zinc sulfide composite materials with relative dielectric constants distributed between 7 and 15, and respectively marking the composite coatings as m according to the relative dielectric constants of the composite materials from high to low1、m2、m3...；
(4) Removing n from the surface of the insulator1All the outer areas are covered by polytetrafluoroethylene tapesBlocking, using epoxy resin/zinc sulfide composite material m1To n1Uniformly coating the surface of the region, and curing the composite material, and then adding n2Zone tape removal and n-pair with absolute ethanol2Cleaning the area and drying, and using m2Paint pair n2And carrying out surface coating treatment on the regions, and finishing the coating of all annular regions on the surface of the basin-type insulator by the same method.
(5) And putting the prepared basin-type insulator into a GIL/GIS system for pressurization treatment, and observing the surface light intensity distribution of the basin-type insulator to check the optimization effect of the surface electric field.
The preparation process of the epoxy resin/zinc sulfide composite material comprises the following steps:
(1) weighing 100g of epoxy resin and curing agent according to the mass ratio of 100:33, placing the epoxy resin and the curing agent in a vacuum stirring device, and stirring for 20 minutes at the temperature of 80 ℃ to uniformly mix the epoxy resin and the curing agent;
(2) uniformly doping zinc sulfide powder with the particle size of 1 mu m and metal powder, putting the mixture into a vacuum stirring device, stirring the mixture for 10min at the temperature of 100 ℃, and uniformly mixing the mixture to prepare the epoxy resin/zinc sulfide composite coating;
(3) the relative dielectric constant of the epoxy resin/zinc sulfide composite coating can be regulated and controlled by changing the type of the doped metal powder and the mass ratio of the doped metal powder to the zinc sulfide;
(4) and after the preset time is reached, taking out the composite coating, and coating the surface of the basin-type insulator.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the composite material with different dielectric constants and electroluminescence characteristics is prepared by mixing the epoxy resin and the zinc sulfide filler doped with different metals, and the composite material is attached to the surface of the GIS/GIL basin-type insulator according to a plurality of designed dielectric constant gradient regions, so that the basin-type insulator with the functional gradient coating can optimize the distribution of a gas-solid interface electric field under the operation working condition, and can perform self-diagnosis on the electric field optimization effect according to the light intensity distribution on the surface of the insulator.
1. The epoxy resin is mixed with zinc sulfide filler doped with different metals to prepare the composite material with different dielectric constants.
2. The relative dielectric constant of the composite material is regulated and controlled by regulating and controlling the mass ratio of the doped metal to the zinc sulfide, and the relative dielectric constant of the epoxy resin/zinc sulfide composite material is distributed in the range of 7-15.
3. The functional gradient coating on the surface of the basin-type insulator has the electroluminescence characteristic, and the optimization effect of the gas-solid interface electric field can be evaluated according to the light intensity distribution on the surface of the basin-type insulator in actual operation.
Drawings
Fig. 1 is a schematic view of a basin-type insulator with electric field regulation and self-diagnosis functions.
FIG. 2 is a flow chart of the preparation of the epoxy/zinc sulfide composite.
Fig. 3 is a surface light intensity distribution diagram of a general basin insulator, an evenly coated basin insulator and a basin insulator with a functionally graded coating under the same working condition: (a) a common insulator; (b) uniformly coating the basin-type insulator; (c) a functional gradient coating basin-type insulator.
Detailed Description
How the GIS/GIL surface electric field regulation and self-diagnosis method based on the functional gradient coating is realized is further described below by combining the attached drawings and specific embodiments.
Example 1
The invention aims to provide a GIS/GIL surface electric field regulation and self-diagnosis method based on a functional gradient coating, which is used for preparing an epoxy resin/zinc sulfide composite material with different relative dielectric constants, attaching a plurality of designed dielectric constant gradient regions to the surface of a GIS/GIL basin-type insulator, optimizing the distribution of a gas-solid interface electric field under an operation working condition and self-diagnosing the electric field optimization effect according to the light intensity distribution under the voltage, and comprises the following specific implementation steps:
1) preparing a basin-type insulator, wherein an epoxy resin matrix selected for preparing the basin-type insulator is CT-5531 type epoxy resin of Hensman company, a curing agent is polyimide resin HY-651, an alumina filler is TAIAN flourishing source-RF-2-alpha type alumina, the epoxy resin, the curing agent and the alumina filler are added into an epoxy vacuum stirring device according to the mass ratio of 100:33:330 for uniform mixing and vacuumizing treatment, the temperature in a final mixing tank is set to be 100 ℃, the mixture is injected into a basin-type insulator mold in a pouring chamber after stirring for 30min, and a basin-type insulator sample is obtained after curing;
2) based on the distribution of the electric field along the surface of the basin-type insulator under the actual working condition, the surface of the basin-type insulator is subjected to gradient layered partition design, the surface of the insulator is radially divided into 3-8 tightly connected annular regions, the electric field intensity of each annular region is respectively marked as n1, n2 and n3. from strong to weak during operation, and the region division of the surface of the basin-type insulator is shown in figure 1;
3) mixing epoxy resin and a copper powder-doped zinc sulfide filler to prepare a composite material with a relative dielectric constant distributed in a range of 7-15, and changing the dielectric constant of the composite material by changing the type and mass fraction of doped metal;
4) the preparation process of the epoxy resin/zinc sulfide composite material is shown in figure 2, and the prepared epoxy resin/zinc sulfide composite material is marked as m1, m2 and m3 … in sequence from large to small according to the relative dielectric constant;
5) removing n from the surface of the insulator1All the other areas are shielded by polytetrafluoroethylene adhesive tape and epoxy resin/zinc sulfide composite material m1To n1Uniformly coating the surface of the area, and curing the composite material, and then, adding n2Zone tape removal and n-pair with absolute ethanol2Cleaning the area and drying the area by using a drying device2Paint pair n2And carrying out surface coating treatment on the regions, and finishing the coating of all annular regions on the surface of the basin-type insulator by the same method.
6) The basin-type insulator with the functional gradient coating is installed in the GIS/GIL, the effect of electric field optimization is evaluated according to the light intensity distribution on the surface of the basin-type insulator when the GIS/GIL normally operates, and the top view of the light intensity distribution on the surface of the ordinary basin-type insulator, the basin-type insulator with the uniform coating and the basin-type insulator with the functional gradient coating under the same working condition is shown in figure 3.
Claims (6)
1. The GIS/GIL surface electric field regulation and self-diagnosis method based on the functional gradient coating is characterized in that composite materials with different dielectric constants are prepared by mixing epoxy resin and zinc sulfide fillers doped with different metals, and a plurality of designed dielectric constant gradient regions are attached to the surface of the GIS/GIL basin-type insulator, so that the electric field optimization effect can be self-diagnosed according to the light intensity distribution under the voltage while the gas-solid interface electric field distribution under the operation working condition is optimized.
The method comprises the following steps:
2. the GIS/GIL in-plane electric field regulation and self-diagnosis method based on the functional gradient coating as claimed in claim 1, comprising the steps of:
1) mixing epoxy resin, a curing agent and an alumina filler, and pouring the mixture into a basin-type insulator mold to prepare a basin-type insulator sample;
2) dividing the surface of the basin-type insulator into a plurality of annular regions along the radial direction based on the surface electric field distribution of the basin-type insulator under the actual working condition, wherein the annular regions are respectively marked as n1、n2、n3...；
3) Uniformly mixing epoxy resin and zinc sulfide filler doped with different metals to prepare epoxy resin/zinc sulfide composite material, and respectively marking the composite coating as m according to the relative dielectric constant of the composite material from high to low1、m2、m3...；
4) Removing n from the surface of the insulator1All the other areas are shielded by polytetrafluoroethylene tapes and epoxy resin/zinc sulfide composite material m1To n1Uniformly coating the surface of the region, and curing the composite material, and then adding n2Zone tape removal and n-pair with absolute ethanol2Cleaning the area and drying the area by using a drying device2Paint pair n2Carrying out surface coating treatment on the regions, and finishing the coating of all annular regions on the surface of the basin-type insulator in sequence by the same method;
the relative dielectric constant of the epoxy resin/zinc sulfide composite material prepared in the step 3) is controlled to be 7-15.
3. The GIS/GIL in-plane electric field regulation and self-diagnosis method based on the functional gradient coating of claim 1 or 2, wherein the voltage level involved in the GIS/GIL comprises 110/220/550/750/1000 kV.
4. The GIS/GIL in-plane electric field regulation and self-diagnosis method based on functional gradient coating of claim 2, wherein the selected functional gradient area is divided into 3-8 annular areas along the radial direction.
5. The GIS/GIL in-plane electric field regulation and control and self-diagnosis method based on the functional gradient coating of claim 2, wherein the mass ratio of the epoxy resin, the curing agent and the alumina filler is 100:33: 330.
6. The GIS/GIL surface electric field regulation and control and self-diagnosis method based on the functional gradient coating of claim 2, wherein the preparation process of the epoxy resin/zinc sulfide composite material is as follows:
(1) weighing 100g of epoxy resin and curing agent according to the mass ratio of 100:33, placing the epoxy resin and the curing agent in a vacuum stirring device, stirring for 20 minutes at the temperature of 80 ℃, and uniformly mixing;
(2) uniformly doping zinc sulfide powder with the particle size of 1 mu m and metal powder, putting the mixture into a vacuum stirring device, stirring the mixture for 10min at the temperature of 100 ℃, and uniformly mixing the mixture to prepare the epoxy resin/zinc sulfide composite coating;
(3) the relative dielectric constant of the epoxy resin/zinc sulfide composite coating can be regulated and controlled by changing the type of the doped metal powder and the mass ratio of the doped metal powder to the zinc sulfide;
(4) and after the preset time is reached, taking out the composite coating, and coating the surface of the basin-type insulator.
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| CN202210247711.3A CN114709034A (en) | 2022-03-14 | 2022-03-14 | GIS/GIL (gas insulated switchgear/gas insulated switchgear) surface electric field regulation and self-diagnosis method based on functional gradient coating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116936009A (en) * | 2023-09-13 | 2023-10-24 | 国网山东省电力公司东营供电公司 | Electric field distribution regulation and control method and system for high-voltage insulating dielectric functionally-graded material |
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| JP2004335390A (en) * | 2003-05-12 | 2004-11-25 | Hitachi Ltd | Cone type insulation spacer |
| CN108428523A (en) * | 2018-03-16 | 2018-08-21 | 天津大学 | GIS insulator design methods with the distribution of two-dimentional dielectric constant linear gradient |
| CN111239505A (en) * | 2020-01-20 | 2020-06-05 | 西安交通大学 | Test system for measuring surface field intensity distribution of insulator |
| CN111599555A (en) * | 2020-05-28 | 2020-08-28 | 天津大学 | Manufacturing method of flexible surface functional gradient basin-type insulator for extra-high voltage direct current GIL |
| CN112087836A (en) * | 2020-08-06 | 2020-12-15 | 复旦大学 | Flexible electroluminescent device capable of changing color dynamically and preparation method thereof |
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- 2022-03-14 CN CN202210247711.3A patent/CN114709034A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004335390A (en) * | 2003-05-12 | 2004-11-25 | Hitachi Ltd | Cone type insulation spacer |
| CN108428523A (en) * | 2018-03-16 | 2018-08-21 | 天津大学 | GIS insulator design methods with the distribution of two-dimentional dielectric constant linear gradient |
| CN111239505A (en) * | 2020-01-20 | 2020-06-05 | 西安交通大学 | Test system for measuring surface field intensity distribution of insulator |
| CN111599555A (en) * | 2020-05-28 | 2020-08-28 | 天津大学 | Manufacturing method of flexible surface functional gradient basin-type insulator for extra-high voltage direct current GIL |
| CN112087836A (en) * | 2020-08-06 | 2020-12-15 | 复旦大学 | Flexible electroluminescent device capable of changing color dynamically and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116936009A (en) * | 2023-09-13 | 2023-10-24 | 国网山东省电力公司东营供电公司 | Electric field distribution regulation and control method and system for high-voltage insulating dielectric functionally-graded material |
| CN116936009B (en) * | 2023-09-13 | 2023-11-28 | 国网山东省电力公司东营供电公司 | Electric field distribution regulation and control method and system for high-voltage insulating dielectric functionally-graded material |
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