CN110931225A - Application of polymer material in gas-insulated transformer - Google Patents
Application of polymer material in gas-insulated transformer Download PDFInfo
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- CN110931225A CN110931225A CN201911227836.4A CN201911227836A CN110931225A CN 110931225 A CN110931225 A CN 110931225A CN 201911227836 A CN201911227836 A CN 201911227836A CN 110931225 A CN110931225 A CN 110931225A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
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Abstract
The invention provides an application of a polymer material on a gas-insulated transformer, wherein the polymer material is an insulating material with the heat resistance grade above E grade. Compared with the prior art, the invention provides the application of the polymer material on the gas-insulated transformer, and the polymer material has higher mechanical strength and insulating property and dielectric constant closer to SF when being used for the gas-insulated transformer compared with the traditional insulating paperboard6The gas and the wire turns are insulated, so that the uniformity of an electric field in the gas-insulated transformer can be improved; meanwhile, the polymer material also has higher heat-resistant temperature.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to application of a polymer material to a gas-insulated transformer.
Background
In recent years, gas-insulated transformers have been widely used in ac power grids, especially in underground substations and large urban population, because they are non-combustible, non-explosive, highly safe, and capable of realizing high voltage and large capacityMore centralized and places with high requirements on safety. Compared with an oil immersed transformer, the gas insulated transformer changes the insulating medium of the transformer oil into SF6A gas; because the dielectric constants of the two insulating media are different, the size and the distribution of an electric field in the coil can be different due to the change of the insulating media under the condition that the other materials in the coil are not changed at the same insulating level. To ensure safe operation of the transformer, the SF is required6The influence of the parametric properties of the gas on other insulating materials in the transformer is studied.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an application of a polymer material in a gas-insulated transformer, wherein the polymer material has high mechanical strength and insulation performance when being used in the gas-insulated transformer, and can improve uniformity of an electric field in the gas-insulated transformer.
The invention provides an application of a polymer material on a gas-insulated transformer, wherein the polymer material is an insulating material with the heat resistance grade above E grade.
Preferably, the polymer material includes one or more of a polymer material containing a ketone bond and an ether bond, an ultra high temperature polymer material containing an imide ring, and an aramid laminate polymer material.
Preferably, the thickness of the polymer material containing a ketone bond and an ether bond is 0.25mm to 170 mm.
Preferably, the dielectric constant of the polymer material containing ketone bonds and ether bonds is 3 to 3.6, and the electrical strength in air is 15kV/mm to 23 kV/mm.
Preferably, the heat resistant temperature of the polymer material containing a ketone bond and an ether bond is 240 to 280 ℃.
Preferably, the thickness of the superhigh temperature polymer material containing imide ring is 6-35 mm.
Preferably, the dielectric constant of the superhigh temperature polymer material containing the imide ring is 3.7-4.3, and the electric strength in the air is 34 kV/mm-40 kV/mm.
Preferably, the heat-resistant temperature of the superhigh temperature polymer material containing imide ring is 320-360 ℃.
Preferably, the thickness of the aromatic polyamide laminate polymer material is 1.4mm to 5 mm.
Preferably, the aromatic polyamide laminated plate polymer material has a dielectric constant of 2.6-3.5, an electrical strength of 19 kV/mm-22 kV/mm in air and a heat-resistant temperature of 200-240 ℃.
The invention provides an application of a polymer material on a gas-insulated transformer, wherein the polymer material is an insulating material with the heat resistance grade above E grade. Compared with the prior art, the invention provides the application of the polymer material on the gas-insulated transformer, and the polymer material has higher mechanical strength and insulating property and dielectric constant closer to SF when being used for the gas-insulated transformer compared with the traditional insulating paperboard6The gas and the wire turns are insulated, so that the uniformity of an electric field in the gas-insulated transformer can be improved; meanwhile, the polymer material also has higher heat-resistant temperature.
Drawings
FIG. 1 is a schematic structural diagram of a simulation calculation model according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the electric field calculation results using conventional insulating paperboard materials;
FIG. 3 is a graph showing the results of electric field calculations using a polymeric material containing both a ketone linkage and an ether linkage;
FIG. 4 is a graph showing the electric field calculation results using an ultrahigh temperature polymer material containing an imide ring;
FIG. 5 is a graph showing the results of electric field calculations using an aromatic polyamide 994 laminate.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an application of a polymer material on a gas-insulated transformer, wherein the polymer material is an insulating material with the heat resistance grade above E grade. In the invention, the polymer material is applied to the insulating material of the gas-insulated transformer, in particular to the insulating material with the heat-resisting grade above E grade; meanwhile, the polymer material also has high mechanical strength and insulating property. The gas-insulated transformer of the present invention is not particularly limited, and may be one using SF known to those skilled in the art6A gas-insulated transformer in which gas is an insulating medium.
In the present invention, the polymer material preferably includes one or more of a polymer material containing a ketone bond and an ether bond, an ultra high temperature polymer material containing an imide ring, and an aramid laminate polymer material, and more preferably a polymer material containing a ketone bond and an ether bond, an ultra high temperature polymer material containing an imide ring, or an aramid laminate polymer material.
In a preferred embodiment of the present invention, the polymer material is a polymer material containing ketone bonds and ether bonds, and specifically comprises a polyetheretherketone plate. The source of the polymer material having a ketone bond and an ether bond in the present invention is not particularly limited, and commercially available products known to those skilled in the art may be used. In the present invention, the thickness of the polymer material containing a ketone bond and an ether bond is preferably 0.25mm to 170mm, and more preferably 3mm to 8 mm.
In the present invention, the dielectric constant of the polymer material containing a ketone bond and an ether bond is preferably 3 to 3.6, and more preferably 3.3; the polymer material having a ketone bond and an ether bond preferably has an electrical strength in air of 15kV/mm to 23kV/mm, more preferably 19 kV/mm.
In the present invention, the heat resistant temperature of the polymer material containing a ketone bond and an ether bond is preferably 240 to 280 ℃, and more preferably 260 ℃ (class C).
In addition, the polymer material containing the ketone bond and the ether bond also has high mechanical strength, and the tensile strength is preferably 150MPa to 160MPa, and more preferably 155 MPa; the compressive strength is preferably 210MPa to 220MPa, more preferably 215 MPa.
In a preferred embodiment of the present invention, the polymer material is an ultrahigh temperature polymer material containing an imide ring, and specifically includes a polyimide sheet. The source of the ultrahigh temperature polymer material containing an imide ring is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. In the present invention, the thickness of the ultrahigh temperature polymer material containing an imide ring is preferably 6mm to 35mm, and more preferably 6mm to 8 mm.
In the invention, the dielectric constant of the superhigh temperature polymer material containing imide ring is preferably 3.7-4.3, and more preferably 3.7; the electrical strength in the air of the ultrahigh-temperature polymer material containing the imide ring is preferably 34 kV/mm-40 kV/mm, and more preferably 37 kV/mm.
In the present invention, the heat resistant temperature of the ultra high temperature polymer material containing imide ring is preferably 320 ℃ to 360 ℃, more preferably 340 ℃ (class C).
In addition, the superhigh temperature polymer material containing imide ring has high mechanical strength, and the tensile strength is preferably greater than or equal to 120MPa, more preferably greater than or equal to 130 MPa; the compressive strength is preferably 150MPa or more, more preferably 160MPa or more.
In a preferred embodiment of the present invention, the polymeric material is an aramid laminate polymeric material, specifically including aramid 994 laminate. The source of the aromatic polyamide laminate polymer material is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. In the present invention, the thickness of the aromatic polyamide laminate polymer material is preferably 1.4mm to 5mm, more preferably 3.2 mm.
In the invention, the dielectric constant of the aromatic polyamide laminated plate polymer material is preferably 2.6-3.5, and more preferably 3.5; the electrical strength in air of the aromatic polyamide laminate polymer material is preferably 19kV/mm to 22 kV/mm.
In the present invention, the heat resistant temperature of the aromatic polyamide laminate polymer material is preferably 200 to 240 ℃, more preferably 220 ℃ (class C).
In addition, the aromatic polyamide laminated plate polymer material also has high mechanical strength, the tensile strength (longitudinal direction) of the aromatic polyamide laminated plate polymer material is preferably 105MPa to 110MPa, more preferably 107MPa, and the tensile strength (transverse direction) of the aromatic polyamide laminated plate polymer material is preferably 90MPa to 95MPa, more preferably 93 MPa; the compressive strength is preferably 400MPa to 500MPa, more preferably 450 MPa.
The invention provides an application of a polymer material on a gas-insulated transformer, wherein the polymer material is an insulating material with the heat resistance grade above E grade. Compared with the prior art, the invention provides the application of the polymer material on the gas-insulated transformer, and the polymer material has higher mechanical strength and insulating property and dielectric constant closer to SF when being used for the gas-insulated transformer compared with the traditional insulating paperboard6The gas and the wire turns are insulated, so that the uniformity of an electric field in the gas-insulated transformer can be improved; meanwhile, the polymer material also has higher heat-resistant temperature.
To further illustrate the present invention, the following examples are provided for illustration. The structural schematic diagram of the simulation calculation model used in the following embodiment of the invention is shown in fig. 1, wherein 1 is a coil wire cake, 2 is outer wrap insulation, 3 is a coil end electrostatic plate, 4 is an upper end angle ring of the electrostatic plate, 5 is an insulating paper board, 6 is a grounding body, 7 is a paper tube, 8 is an insulating material between wire cakes, and the rest positions between 1 to 8 are filled with SF6A gas. The invention calculates the distribution condition of the coil electric field by changing the insulating material 8 between the wire cakes, and determines whether the new material meets the insulation requirement of the transformer or not by comparing the electric field calculation results of the conventional insulating paperboard material and the polymer material.
Comparative example
A conventional insulating paperboard material is adopted as the insulating material 8, and a schematic diagram of electric field calculation results is shown in fig. 2; FIG. 2 is a schematic diagram of the electric field calculation results using conventional insulating paperboard materials; the included angle between the wire outer wrapped turn insulation 2 and the insulation cushion block 8 is SF6The electric field intensity in the gas is the largest, the maximum value is 2.748V/m, and the electric field intensity at the rest positions is smaller than that at the rest positions.
Example 1
A polyether ether ketone plate is used as an insulating material 8, and a schematic diagram of an electric field calculation result is shown in fig. 3; FIG. 3 is a graph showing the results of electric field calculations using a polymeric material containing both a ketone linkage and an ether linkage; after the insulating material 8 is changed, the included angle between the wire outer wrapped turn insulation 2 and the insulating cushion block 8 is SF6The electric field intensity in the gas is also maximum, but the maximum value is reduced to 2.129V/m, and the electric field intensity of the rest positions is smaller than that of the rest positions.
Example 2
A polyimide plate is used as the insulating material 8, and a schematic diagram of the electric field calculation result is shown in fig. 4; FIG. 4 is a graph showing the electric field calculation results using an ultrahigh temperature polymer material containing an imide ring; after the insulating material 8 is changed, the included angle between the wire outer wrapped turn insulation 2 and the insulating cushion block 8 is SF6The electric field intensity in the gas is also maximum, but the maximum value is reduced to 2.379V/m, and the electric field intensity at the rest positions is smaller than that at the rest positions.
Example 3
The aromatic polyamide 994 laminated board is adopted as the insulating material 8, and the electric field calculation result is schematically shown in fig. 5; FIG. 5 is a graph showing the electric field calculation results using an aromatic polyamide 994 laminate; after the insulating material 8 is changed, the included angle between the wire outer wrapped turn insulation 2 and the insulating cushion block 8 is SF6The electric field intensity in the gas is also maximum, but the maximum value is reduced to 2.259V/m, and the electric field intensity at the rest positions is smaller than that at the rest positions.
The comparison of the performance parameters of the polymer material provided in examples 1-3 of the present invention and the insulating paperboard (T4) is shown in Table 1.
TABLE 1 comparison of the Property parameters of the polymeric materials and the insulating paper boards (T4) provided in examples 1 to 3 of the present invention
As can be seen by comparing FIGS. 2-5: under the same insulation level, the polymer material provided by the invention is used as the insulation material of the gas-insulated transformer, compared with the conventional insulation paperboard material, the maximum field intensity of the transformer in an insulation medium can be reduced, the effect is obvious, the maximum field intensity is reduced by 13.43-22.53%, and the safety and reliability of the transformer are improved. Meanwhile, it can also be seen that: the closer the dielectric constant is to the gaseous cooling medium, the lower its maximum electric field strength.
The comparison of the performance parameters in fig. 2-5 and table 1 shows that: on the premise of meeting the requirements of tensile strength, elongation, compression strength, electrical strength in air and heat-resistant temperature, the polymer material containing ketone bonds and ether bonds, the ultrahigh-temperature polymer material containing imide rings and the aromatic polyamide laminated board polymer material provided by the invention can replace an insulating paperboard (T4) material to be used for a gas-insulated transformer, so that the electric field strength in gas can be better reduced, and the gas-insulated transformer is safer and more reliable.
In conclusion, compared with the conventional insulating paperboard material, the polymer material provided by the invention has the characteristics of high tensile strength, high electric strength resistance, high heat resistance grade and the like, and is more suitable for the gas-insulated transformer when being applied to the gas-insulated transformer as the insulating material.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The application of the polymer material on the gas-insulated transformer is characterized in that the polymer material is an insulating material with the heat resistance grade above E grade.
2. Use according to claim 1, wherein the polymer material comprises one or more of a polymer material containing ketone and ether linkages, an ultra high temperature polymer material containing imide rings and an aromatic polyamide laminate polymer material.
3. Use according to claim 2, wherein the thickness of the polymeric material containing ketone and ether linkages is between 0.25mm and 170 mm.
4. The use according to claim 2, wherein the polymeric material containing a ketone bond and an ether bond has a dielectric constant of 3 to 3.6 and an electrical strength in air of 15 to 23 kV/mm.
5. Use according to claim 2, wherein the polymeric material containing both ketone and ether linkages has a heat resistance temperature of 240 ℃ to 280 ℃.
6. Use according to claim 2, characterised in that the thickness of the superhigh temperature polymer material containing an imide ring is between 6mm and 35 mm.
7. The use according to claim 2, wherein the dielectric constant of the superhigh temperature polymer material containing imide ring is 3.7-4.3, and the electric strength in air is 34-40 kV/mm.
8. Use according to claim 2, characterised in that the heat resistant temperature of the ultra high temperature polymeric material containing imide rings is 320 ℃ to 360 ℃.
9. Use according to claim 2, wherein the thickness of the aramid laminate polymer material is 1.4mm to 5 mm.
10. The use according to claim 2, wherein the aramid laminate polymer material has a dielectric constant of 2.6 to 3.5, an electrical strength of 19 to 22kV/mm in air, and a heat resistance temperature of 200 to 240 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911227836.4A CN110931225A (en) | 2019-12-04 | 2019-12-04 | Application of polymer material in gas-insulated transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911227836.4A CN110931225A (en) | 2019-12-04 | 2019-12-04 | Application of polymer material in gas-insulated transformer |
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| CN110931225A true CN110931225A (en) | 2020-03-27 |
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| CN201911227836.4A Pending CN110931225A (en) | 2019-12-04 | 2019-12-04 | Application of polymer material in gas-insulated transformer |
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2019
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| CN102464886A (en) * | 2010-11-12 | 2012-05-23 | 日东电工株式会社 | Polyamide imide resin composition and insulating sheet including the polyamide imide resin composition |
| CN202711735U (en) * | 2012-07-09 | 2013-01-30 | 上海川叶电子科技有限公司 | Three-layered tinned stranded insulation wire |
| CN103545025A (en) * | 2012-07-09 | 2014-01-29 | 上海川叶电子科技有限公司 | Insulated winding wire used for transformer or high-frequency coil |
| CN104321833A (en) * | 2013-02-07 | 2015-01-28 | 古河电气工业株式会社 | Insulating laminated body of enamel resin, and insulated wire and electric appliance using the same |
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Application publication date: 20200327 |