CN108320874A - The method of inhibition GIS insulator surface charge accumulations based on linear gradient processing - Google Patents
The method of inhibition GIS insulator surface charge accumulations based on linear gradient processing Download PDFInfo
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- CN108320874A CN108320874A CN201810217661.8A CN201810217661A CN108320874A CN 108320874 A CN108320874 A CN 108320874A CN 201810217661 A CN201810217661 A CN 201810217661A CN 108320874 A CN108320874 A CN 108320874A
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- linear gradient
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- epoxy resins
- surface charge
- resins insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/02—Drying; Impregnating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/04—Treating the surfaces, e.g. applying coatings
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Insulating Bodies (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention discloses a kind of method of the inhibition GIS insulator surface charge accumulations handled based on linear gradient, and this method comprises the following steps：1) epoxide resin material is prepared：2) epoxide resin material is handled using gradient temperature solidification method；3) gradient design is carried out to epoxy resins insulation sample：(1) epoxy resins insulation specimen surface is divided into five closely coupled rectangles from left to right, and the relative dielectric constant of rectangle is enabled to be sequentially reduced；(2) epoxy resins insulation sample is positioned in magnetron sputtering apparatus, sputters different time in different location, time range is 0min~60min to get the epoxide resin material being distributed to two-dimensional gradient.The present invention inhibits the accumulation of Spacer Under AC Voltage surface charge, promotes insulator electric durability energy, improves the safety of GIS operation stabilities and electric system.
Description
Technical field
Modified polymeric material and its preparation field in being manufactured the invention belongs to high voltage installation, and be related to a kind of based on linear
The method of the inhibition GIS insulator surface charge accumulations of gradient processing.
Background technology
In recent years, with electric system high voltage, the growth requirement of large capacity transmission, gas-insulated metal enclosed switchgear is set
Standby (GIS) and gas-insulated metal closed power transmission line (GIL) are excellent because its transmission capacity is big, floor space is small, reliability is high etc.
Point has obtained extensive concern and application.Wherein, disc insulator not only plays the role of mechanical support, but also as electric insulation
Body plays conclusive key effect to the safe and stable operation of entire GIS, GIL.However, even if harsh in quality
In 1000kV AC extra high voltage engineerings, epoxy casting class insulator remains unchanged Frequent Troubles.
It is generally believed that in GIS/GIL operational process, disc insulator surface can be in high pressure guide rod and grounded metal enclosure
Between greatly gather a large amount of charge under field strength, cause disc insulator serious along the local field strength distortion in face, to increase
The probability that edge flashing occurs.
Functionally graded material (FunctionallyGradedMaterial, the FGM) concept in materialogy field is applied to
Electric insulation field by building the insulation system of relative dielectric constant non-uniform Distribution, and then inhibits the lower sublist that insulate of exchange
The accumulation of surface charge.Magnetron sputtering method is modified applied to epoxy resin primary surface, two dimension FGM is constructed by controlling sputtering time
Insulator, have many advantages, such as it is easy to operate, easily controllable, for inhibit exchange GIS insulator surface charge accumulations provide completely newly
Method.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of inhibition GIS based on linear gradient processing
The method of insulator surface charge accumulation constructs the insulation with two-dimentional dielectric constant gradient distribution by controlling sputtering time
Son, and then inhibit the accumulation of Spacer Under AC Voltage surface charge, insulator electric durability energy is promoted, it is stable to improve GIS
The safety of property and electric system.
The present invention is to solve the technical solution that its technical problem proposes to be：Inhibition GIS insulation based on linear gradient processing
The method of sub- surface charge accumulation, this method comprises the following steps：
1) epoxide resin material is prepared：
(1) by epoxy resin-matrix and curing agent according to 3:1 mass ratio is mixed, and epoxy resin composition is obtained；
(2) mechanical agitator, which stirs 60~90min, makes it be uniformly mixed；
(3) 40~60min being de-gassed to epoxy resin composition using aspiration pump and vacuum tank, vacuum degree is-
0.1MPa；
(4) it pours into and is coated in the mold of releasing agent；
2) epoxide resin material is handled using gradient temperature solidification method, and solidification process is divided into two steps：
(1) mold and base-material are heated to curing 4 hours at 70 DEG C；
(2) 130 DEG C are again heated to cure 4 hours；
(3) after being fully cured, cooling, demoulding obtains epoxy resins insulation sample；
3) gradient design is carried out to epoxy resins insulation sample：
(1) epoxy resins insulation specimen surface is divided into five closely coupled rectangles from left to right, and enables the phase of rectangle
Dielectric constant is sequentially reduced；
(2) epoxy resins insulation sample is positioned in magnetron sputtering apparatus, different time, time is sputtered in different location
Ranging from 0min~60min is to get the epoxide resin material being distributed to two-dimensional gradient.
The step 3) is specifically：
(1) gradient design is carried out according to bar shaped pattern to epoxy resins insulation sample, i.e., be divided on its surface from left to right
Five closely coupled rectangles, and the relative dielectric constant of rectangle is enabled to be sequentially reduced；
(2) epoxy resins insulation sample is positioned in magnetron sputtering apparatus, is distributed according to the linear gradient of bar shaped pattern
Different time is sputtered in different location, sputtering time is respectively 60min, 45min, 30min, 15min, 0min from left to right.
The step 3) is specifically：
(1) gradient design is carried out according to annular pattern to epoxy resins insulation sample, i.e., be divided on its surface from inside to outside
Five closely coupled annulars, and the relative dielectric constant of annular is enabled to be sequentially reduced；
(2) epoxy resins insulation sample is positioned in magnetron sputtering apparatus, is distributed according to the linear gradient of annular pattern
Different time is sputtered in different location, sputtering time is respectively 60min, 45min, 30min, 15min, 0min from inside to outside.
The radio-frequency voltage in (2) sputtering process is 650V, electric current 120mA step by step in the step 3).
(2) sputter under argon atmosphere and carry out step by step in the step 3), and argon gas flow velocity is 50~60SCCM.
The preferred TiO of target that (2) magnetron sputtering apparatus uses step by step in the step 3)2。
The bisphenol A epoxide resin of the preferred glycidol ethers of step 1) epoxy resin base.
The preferred low-molecular-weight polyamide resin HY-651 of curing agent in the step 1).
Advantageous effect
The present invention uses for reference the theory of absorption function functionally gradient material (FGM) (FGM), innovatively uses the method for magnetron sputtering will be high
Dielectric constant inorganic matter TiO2Etc. being sputtered onto epoxy resin primary surface, and passes through control and sputter duration and form epoxy resin surface and be situated between
The two-dimensional gradient of electric constant is distributed, and builds surface dielectric functionally graded material, and then is reached and inhibited epoxy resin surface charge product
Purpose that is poly- and promoting electric durability energy.
The present invention has important theory value and engineering to improving the operation stability of GIS and the safety of electric system
Meaning.
Description of the drawings
Fig. 1 is the two-dimentional dielectric constant linear gradient distribution schematic diagram of bar shaped pattern；
Fig. 2 is the two-dimentional dielectric constant linear gradient distribution schematic diagram of annular pattern；
Fig. 3 is the relation curve for measuring the various sample surface potential of obtained bar shaped pattern and changing with surface location.
Specific implementation mode
Below by specific embodiments and the drawings, the present invention is further illustrated.The embodiment of the present invention is in order to more
So that those skilled in the art is more fully understood the present invention well, any limitation is not made to the present invention.
A kind of method of the inhibition GIS insulator surface charge accumulations based on linear gradient processing of the present invention, the present invention make
Epoxy resin-matrix is the bisphenol A epoxide resin of glycidol ethers；Curing agent is low-molecular-weight polyamide resin HY-651；
The target that magnetron sputtering uses includes but not limited to TiO2, and provided by middle promise green wood (Beijing) Science and Technology Ltd.；Magnetic control splashes
It is DK-92L types power control cabinet and BILON-T-5001 type sub-cooled circulator to penetrate corollary apparatus.
The present invention realizes the inhibition of the insulator surface charge accumulation handled based on linear gradient by magnetically controlled sputter method；
The type of two-dimensional gradient distribution is dull is distributed；The pattern of two-dimensional gradient distribution is divided into bar shaped gradient and annular gradient.
Embodiment 1
1) by epoxy resin-matrix and curing agent according to 3:1 mass ratio is mixed, and is stirred using mechanical agitator
60min makes it be uniformly mixed；Then 40min is de-gassed to epoxy resin composition using aspiration pump and vacuum tank, very
Reciprocal of duty cycle is -0.1MPa；Then be poured into the mold for being coated with releasing agent, solidification, it is cooling, demould to get.
2) epoxide resin material is handled using gradient temperature solidification method, and solidification process is divided into two steps, first by mold and base-material
It is heated to curing 4 hours at 70 DEG C, is then again heated to 130 DEG C and cures 4 hours, after being fully cured, cooling, demoulding obtains ring
Oxygen insulation resin sample.
3) gradient design is carried out according to bar shaped pattern to epoxy resins insulation sample, i.e., its surface is divided into five from left to right
A closely coupled rectangle, and the relative dielectric constant of rectangle is enabled to be sequentially reduced：Epoxy resins insulation sample is positioned over magnetic control
In sputtering equipment, it is distributed in different location according to the linear gradient of bar shaped pattern and sputters different time, from left to right sputtering time
Respectively 60min, 45min, 30min, 15min, 0min, you can obtain the epoxide resin material of two-dimensional gradient distribution.
As shown in Figure 1, the two-dimentional dielectric constant linear gradient distribution schematic diagram of bar shaped pattern.
Radio-frequency voltage in sputtering process is 650V, electric current 120mA；It sputters under argon atmosphere and carries out, argon gas flow velocity
For 50SCCM.
Embodiment 2
1) by epoxy resin-matrix and curing agent according to 3:1 mass ratio is mixed, and is stirred using mechanical agitator
90min makes it be uniformly mixed；Then 60min is de-gassed to epoxy resin composition using aspiration pump and vacuum tank, very
Reciprocal of duty cycle is -0.1MPa, is then poured into the mold for being coated with releasing agent, solidification, it is cooling, demould to get.
2) epoxy resin is handled using gradient temperature solidification method, and solidification process is divided into two steps, first heats mold and base-material
Cure 4 hours to 70 DEG C, be then again heated to 130 DEG C and cure 4 hours, after being fully cured, cooling, demoulding can be obtained epoxy
Insulation resin sample.
3) gradient design is carried out according to annular pattern to epoxy resins insulation sample, i.e., its surface is divided into five from inside to outside
A closely coupled annular, and the relative dielectric constant of annular is enabled to be sequentially reduced：Epoxy resins insulation sample is positioned over magnetic control
In sputtering equipment, it is distributed in different location according to the linear gradient of annular pattern and sputters different time, from inside to outside sputtering time
Respectively 60min, 45min, 30min, 15min, 0min, you can obtain the epoxide resin material of two-dimensional gradient distribution.
As shown in Fig. 2, the two-dimentional dielectric constant linear gradient distribution schematic diagram of annular pattern.
Radio-frequency voltage in sputtering process is 650V, electric current 120mA；It sputters under argon atmosphere and carries out, argon gas flow velocity
For 60SCCM.
Fig. 3 shows that the initial potential peak value of the pure epoxy resin handled without gradient surface is 2446, and based on linear ladder
The initial potential peak value for spending the epoxy resin of surface treatment is 2222, has dropped about 9.16%.
Claims (8)
1. the method for the inhibition GIS insulator surface charge accumulations based on linear gradient processing, which is characterized in that this method includes
Following steps：
1) epoxide resin material is prepared：
(1) by epoxy resin-matrix and curing agent according to 3:1 mass ratio is mixed, and epoxy resin composition is obtained；
(2) mechanical agitator stirring 60~90min makes it be uniformly mixed；
(3) 40 are de-gassed to epoxy resin composition using aspiration pump and vacuum tank~60min, vacuum degree be-
0.1MPa；
(4) it pours into and is coated in the mold of releasing agent；
2) epoxide resin material is handled using gradient temperature solidification method, and solidification process is divided into two steps：
(1) mold and base-material are heated to curing 4 hours at 70 DEG C；
(2) 130 DEG C are again heated to cure 4 hours；
(3) after being fully cured, cooling, demoulding obtains epoxy resins insulation sample；
3) gradient design is carried out to epoxy resins insulation sample：
(1) epoxy resins insulation specimen surface is divided into five closely coupled rectangles from left to right, and enables opposite Jie of rectangle
Electric constant is sequentially reduced；
(2) epoxy resins insulation sample is positioned in magnetron sputtering apparatus, different time, time range is sputtered in different location
It is 0min~60min to get the epoxide resin material being distributed to two-dimensional gradient.
2. the method for the inhibition GIS insulator surface charge accumulations according to claim 1 based on linear gradient processing,
It is characterized in that, the step 3) is specifically：
(1) gradient design is carried out according to bar shaped pattern to epoxy resins insulation sample, i.e., its surface is divided into five from left to right
Closely coupled rectangle, and the relative dielectric constant of rectangle is enabled to be sequentially reduced；
(2) epoxy resins insulation sample is positioned in magnetron sputtering apparatus, is distributed in not according to the linear gradient of bar shaped pattern
Different time is sputtered with position, sputtering time is respectively 60min, 45min, 30min, 15min, 0min from left to right.
3. the method for the inhibition GIS insulator surface charge accumulations according to claim 1 based on linear gradient processing,
It is characterized in that, the step 3) is specifically：
(1) gradient design is carried out according to annular pattern to epoxy resins insulation sample, i.e., its surface is divided into five from inside to outside
Closely coupled annular, and the relative dielectric constant of annular is enabled to be sequentially reduced；
(2) epoxy resins insulation sample is positioned in magnetron sputtering apparatus, is distributed in not according to the linear gradient of annular pattern
Different time is sputtered with position, sputtering time is respectively 60min, 45min, 30min, 15min, 0min from inside to outside.
4. the method for the inhibition GIS insulator surface charge accumulations according to claim 1 based on linear gradient processing,
It is characterized in that, the radio-frequency voltage in (2) sputtering process is 650V, electric current 120mA step by step in the step 3).
5. the method for the inhibition GIS insulator surface charge accumulations according to claim 1 based on linear gradient processing,
It is characterized in that, (2) sputter under argon atmosphere and carry out step by step in the step 3), and argon gas flow velocity is 50~60SCCM。
6. the method for the inhibition GIS insulator surface charge accumulations according to claim 1 based on linear gradient processing,
It is characterized in that, the preferred TiO of target that (2) magnetron sputtering apparatus uses step by step in the step 3)2。
7. the method for the inhibition GIS insulator surface charge accumulations according to claim 1 based on linear gradient processing,
It is characterized in that, the bisphenol A epoxide resin of the preferred glycidol ethers of step 1) epoxy resin base.
8. the method for the inhibition GIS insulator surface charge accumulations according to claim 1 based on linear gradient processing,
It is characterized in that, the preferred low-molecular-weight polyamide resin HY-651 of curing agent in the step 1).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109575339A (en) * | 2018-11-30 | 2019-04-05 | 天津大学 | A kind of the nano coating insulator and preparation method of resistance to direct current flashover |
| CN109767884A (en) * | 2018-12-29 | 2019-05-17 | 南方电网科学研究院有限责任公司 | A kind of GIL insulator production method with surface conductance gradient distribution |
| 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 |
| CN110183825A (en) * | 2019-06-14 | 2019-08-30 | 清华大学深圳研究生院 | Dielectric gradient material and its application |
| CN110256813A (en) * | 2019-06-14 | 2019-09-20 | 清华大学深圳研究生院 | The preparation method of dielectric gradient material and the encapsulating method of electronic component |
| CN111462961A (en) * | 2020-03-25 | 2020-07-28 | 天津大学 | Preparation method of high-voltage GI L surface functional gradient insulator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840757A (en) * | 2010-05-21 | 2010-09-22 | 扬州东宇电气有限公司 | Manufacturing method for environment-friendly type insulator shell |
| CN105504685A (en) * | 2015-12-31 | 2016-04-20 | 平高集团有限公司 | High-arc resistance epoxy insulating material and preparation method thereof and insulator |
| CN105542399A (en) * | 2016-01-18 | 2016-05-04 | 西安交通大学 | Centrifugal manufacturing method for dielectric functional gradient insulator |
| CN105679473A (en) * | 2016-01-18 | 2016-06-15 | 西安交通大学 | Lamination fabrication method of dielectric functionally graded insulator |
| CN107578861A (en) * | 2017-09-01 | 2018-01-12 | 云南电网有限责任公司电力科学研究院 | Charge injection and device under a kind of transient suppression electric field |
-
2018
- 2018-03-16 CN CN201810217661.8A patent/CN108320874B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840757A (en) * | 2010-05-21 | 2010-09-22 | 扬州东宇电气有限公司 | Manufacturing method for environment-friendly type insulator shell |
| CN105504685A (en) * | 2015-12-31 | 2016-04-20 | 平高集团有限公司 | High-arc resistance epoxy insulating material and preparation method thereof and insulator |
| CN105542399A (en) * | 2016-01-18 | 2016-05-04 | 西安交通大学 | Centrifugal manufacturing method for dielectric functional gradient insulator |
| CN105679473A (en) * | 2016-01-18 | 2016-06-15 | 西安交通大学 | Lamination fabrication method of dielectric functionally graded insulator |
| CN107578861A (en) * | 2017-09-01 | 2018-01-12 | 云南电网有限责任公司电力科学研究院 | Charge injection and device under a kind of transient suppression electric field |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109575339A (en) * | 2018-11-30 | 2019-04-05 | 天津大学 | A kind of the nano coating insulator and preparation method of resistance to direct current flashover |
| CN109575339B (en) * | 2018-11-30 | 2021-10-15 | 天津大学 | Direct-current flashover resistant nano-coating insulator and preparation method thereof |
| CN109767884A (en) * | 2018-12-29 | 2019-05-17 | 南方电网科学研究院有限责任公司 | A kind of GIL insulator production method with surface conductance gradient distribution |
| 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 |
| CN110183825A (en) * | 2019-06-14 | 2019-08-30 | 清华大学深圳研究生院 | Dielectric gradient material and its application |
| CN110256813A (en) * | 2019-06-14 | 2019-09-20 | 清华大学深圳研究生院 | The preparation method of dielectric gradient material and the encapsulating method of electronic component |
| CN110183825B (en) * | 2019-06-14 | 2022-02-25 | 清华大学深圳研究生院 | Dielectric gradient material and application thereof |
| CN110256813B (en) * | 2019-06-14 | 2022-02-25 | 清华大学深圳研究生院 | Preparation method of dielectric gradient material and encapsulation method of electronic component |
| CN111462961A (en) * | 2020-03-25 | 2020-07-28 | 天津大学 | Preparation method of high-voltage GI L surface functional gradient insulator |
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