CN110010312A - High-voltage direct-current sleeve pressure-equalizing device and method based on nonlinear conductance epoxy resin - Google Patents
High-voltage direct-current sleeve pressure-equalizing device and method based on nonlinear conductance epoxy resin Download PDFInfo
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- CN110010312A CN110010312A CN201910280800.6A CN201910280800A CN110010312A CN 110010312 A CN110010312 A CN 110010312A CN 201910280800 A CN201910280800 A CN 201910280800A CN 110010312 A CN110010312 A CN 110010312A
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- casing
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- flange
- nonlinear
- nonlinear conductance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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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
- H01B17/26—Lead-in insulators; Lead-through insulators
- H01B17/28—Capacitor type
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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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- 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
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
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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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
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- General Engineering & Computer Science (AREA)
- Mathematical Optimization (AREA)
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- Insulators (AREA)
Abstract
The present invention relates to high voltage DC transformers and related insulating materials, for the electric field distortion degree for improving converter transformer sleeve flange and end, the present invention, high-voltage direct-current sleeve pressure-equalizing device and method based on nonlinear conductance epoxy resin, converter power transformer oil sealing is immersed in casing one end connecting flange, the flange lower end, and upper end is exposed to air, the capacitor core of wrapped epoxy impregnation paper and aluminium foil composition around casing guide rod, as major insulation；Capacitor core and the outer inner room of casing fill SF6Insulating gas, casing housing constitute external insulation using the full skirt of silicon rubber composite material composition；One cylindrical metallic flange, which is used as, to be mechanically fixed, and full skirt and lower end are connected；Lower end outgoing line device dielectric is that the step-like special cardboard of arrangement is presented to access in transformer oil, and upper end connects conductor and accesses valve hall, respectively in air, SF6End pressure-equalizing device annular in shape is provided in gas and transformer oil.Present invention is mainly applied to the design and manufacture of high voltage DC transformers.
Description
Technical field
The present invention relates to high voltage direct current insulating materials, and in particular to the high voltage direct current set based on nonlinear conductance epoxy resin
Pipe method for equalizing voltage.
Background technique
Converter transformer bushings are an insulation weak links of converter power transformer, and especially cannula center guide rod fever makes
The radial direction temperature difference that fuse generates, conductance are affected by temperature, cause electric field distortion, easily occur insulation fault in the process of running.
With the increase that casing loads, radial temperature difference is distorted the field distribution of flange casing fuse, the distortion near flange
Field strength full load is up to 12kV/mm.Meanwhile field strength decline of the casing fuse near guide rod makes end SF6The electricity that gas is born
Gas intensity increases nearly 3 times, easily causes gas discharge.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention is directed to improve converter transformer sleeve method using nonlinear conductance epoxy resin
The blue electric field distortion degree with end.For this reason, the technical scheme adopted by the present invention is that the height based on nonlinear conductance epoxy resin
Press DC bushing pressure-equalizing device, structure is as follows: converter power transformer oil sealing is immersed in casing one end connecting flange, the flange lower end,
Upper end is exposed to air, the capacitor core of wrapped epoxy impregnation paper and aluminium foil composition around casing guide rod, as major insulation；Capacitor
Core and the outer inner room of casing fill SF6Insulating gas, casing housing constitute external insulation using the full skirt of silicon rubber composite material composition；
One cylindrical metallic flange, which is used as, to be mechanically fixed, and full skirt and lower end are connected；Lower end outgoing line device dielectric is to present
In the step-like special cardboard access transformer oil of arrangement, upper end connects conductor and accesses valve hall, to prevent end paradoxical discharge, respectively
In air, SF6End pressure-equalizing device annular in shape is provided in gas and transformer oil,
Aluminium foil barrier is reduced to 23 layers, and every thickness degree 0.02mm, internal layer connects with guide rod, outer ground flange.
High-voltage direct-current sleeve method for equalizing voltage based on nonlinear conductance epoxy resin, steps are as follows:
1) the every electrical, calorifics and underlying parameter of casing different materials are set；
The conductivity of ordinary epoxy resin is reduced to be only about the function of temperature[19],
γ0=45.4 [S/m] e-10860[K]/T (1)
2) using the silicon carbide or zinc oxide semiconductive filler of doping different proportion, epoxy resin composite material is obtained
Conductivity is,
Wherein, Ek is nonlinear conductance threshold field strength temperature controlled, V/m；β is nonlinear conductance temperature controlled
The measurement result of coefficient, existing nonlinear material conductivity shows the nonlinear conductance threshold value E of nonlinear conductance insulating materialsk
With nonlinear factor β as temperature reduces, on this basis, the E under different temperatures is setkAnd β；
3) finite element model of high-voltage direct-current sleeve is established, and mesh generation is carried out to model: is set at the beginning of one first
Beginning field distribution E0 (r, z) and thermo parameters method T0 (r, z), and determine that the conductivity of casing fuse is divided according to formula (1) and (2)
Cloth is distributed E (r, z) with DC Steady field distribution equation calculation dielectric internal electric field according to distribution of conductivity.It will be situated between
Matter joule heat is loaded into steady state heat transfer equation, and the thermo parameters method T (r, z) of casing is calculated, is calculated according to above step
The distribution of conductivity of electric field and thermo parameters method the amendment casing fuse arrived, according to amendment attribute, again with field distribution equation
It is secondary to seek field distribution, and substitute into and correct thermo parameters method in heat transfer equation, repeatedly until adjacent iterative calculation electricity twice
Field and temperature gap meet control accuracy requirement.
The features of the present invention and beneficial effect are:
Fig. 3 is shown ordinary epoxy resin fuse is replaced with nonlinear conductance epoxy resin after, A under casing full-loading condition,
B, the radial electric field distribution of tri- positions C.By Fig. 3 (a) it can be seen that electric field distortion degree of the non-linear casing in position A is opposite
It is greatly improved in ordinary casing.The electric field distortion maximum value of flange is reduced to 7kV/mm or so by 12kV/mm, and
Field strength close to guide rod then increased.Due to pressure effect of the foil shielding layer in casing fuse axial direction, non-linear casing
In position, the barrier zones electric field intensity inside high of B and C are consequently increased.As shown in Fig. 3 (b) and (c), non-linear casing is in position B and C
SF6/ transformer oil region in, electric field strength is reduced relative to ordinary casing.Since the dielectric strength of epoxy resin is greater than
SF6 and transformer oil, so that epoxy resin is born bigger electric field strength reduces the insulation burden of SF6 and transformer oil, has
Help improve casing integral insulation level.
Detailed description of the invention:
Fig. 1 ± 600kV super-pressure converter transformer bushings insulation system
Fig. 2 finite element electric-thermal-stream coupling model iterates to calculate process
Fig. 3 nonlinear conductance casing radial electric field is distributed preferred forms
After nonlinear conductance epoxy resin, the casing fuse electric field distortion of flange is greatly improved,
Maximum distortion field strength has dropped 33%.Meanwhile the electric field strength in the SF6 gas and transformer oil of cannula tip also drops therewith
It is low.
Specific embodiment
After conventional epoxies are replaced with nonlinear conductance epoxy resins insulation herein, the casing fuse electric field of flange
Distortion is greatly improved, while the SF of cannula tip has also been effectively relieved6The insulation of gas and transformer oil is born.It is imitative
True result is demonstrated inhibits casing fuse electric field distortion to reduce probability of malfunction using nonlinear conductance epoxy resins insulation
Feasibility.
The technical solution adopted by the present invention are as follows:
Establish ± a 600kV, two axisymmetric models of rated current 3600A, as shown in Fig. 1.Casing overall length
Transformer oil is immersed in 11.6m, casing maximum outside diameter 0.45m, flange lower end, and upper end is exposed to air.It is wrapped around casing guide rod
The capacitor core of epoxy impregnation paper and aluminium foil composition, as major insulation；Capacitor core and the outer inner room of casing fill SF6Insulating gas,
Casing housing constitutes external insulation using the full skirt of silicon rubber composite material composition；One cylindrical metallic flange, which is used as, to be mechanically fixed, even
Connect full skirt and lower end；Lower end outgoing line device dielectric is that the step-like special cardboard of arrangement is presented to access transformer oil
In, upper end connects conductor and accesses valve hall, due to outgoing line device complexity, simplifies processing in modeling.To prevent end paradoxical discharge, point
Not in air, SF6In gas and transformer oil be provided with end pressure-equalizing device annular in shape, radius be respectively 0.48m, 0.25m,
0.28m.Aluminium foil barrier is reduced to 23 layers herein, every thickness degree 0.02mm, internal layer connects with guide rod, outer ground flange.
1) the every electrical, calorifics and underlying parameter of casing different materials are set, as shown in appendix 1.
The parameter of 1 casing each section material of table
The conductivity of ordinary epoxy resin is reduced to herein to be only about the function of temperature[19],
γ0=45.4 [S/m] e-10860[K]/T (3)
2) using the silicon carbide or zinc oxide semiconductive filler of doping different proportion, epoxy resin composite material is obtained
Conductivity is,
Wherein, EkFor nonlinear conductance threshold field strength temperature controlled, V/m；β is nonlinear conductance temperature controlled
Coefficient.The measurement result of existing nonlinear material conductivity shows the nonlinear conductance threshold value E of nonlinear conductance insulating materialsk
With nonlinear factor β as temperature reduces[20].On this basis, the Ek under setting different temperatures and β are as shown in table 2 herein.
E under 2 different temperatures of tablekAnd β
3) finite element model of high-voltage direct-current sleeve is established, and mesh generation is carried out to model.It is set at the beginning of one first
Beginning field distribution E0 (r, z) and thermo parameters method T0 (r, z), and determine that the conductivity of casing fuse is divided according to formula (1) and (2)
Cloth.According to distribution of conductivity, E (r, z) is distributed with DC Steady field distribution equation calculation dielectric internal electric field.It will be situated between
Matter joule heat is loaded into steady state heat transfer equation, and the thermo parameters method T (r, z) of casing is calculated.It is calculated according to above step
The distribution of conductivity of electric field and thermo parameters method the amendment casing fuse arrived.According to amendment attribute, again with field distribution equation
It is secondary to seek field distribution, and substitute into and correct thermo parameters method in heat transfer equation.Repeatedly until adjacent iterative calculation electricity twice
Field and temperature gap meet control accuracy requirement.
Claims (3)
1. a kind of high-voltage direct-current sleeve pressure-equalizing device based on nonlinear conductance epoxy resin, characterized in that structure is as follows: casing
Converter power transformer oil sealing is immersed in one end connecting flange, the flange lower end, and upper end is exposed to air, wrapped ring around casing guide rod
The capacitor core of oxygen impregnated paper and aluminium foil composition, as major insulation；Capacitor core and the outer inner room of casing fill SF6Insulating gas, set
Pipe housing constitutes external insulation using the full skirt of silicon rubber composite material composition；One cylindrical metallic flange, which is used as, to be mechanically fixed, and is connected
Full skirt and lower end；Lower end outgoing line device dielectric is that the step-like special cardboard of arrangement is presented to access transformer oil
In, upper end connects conductor and accesses valve hall, to prevent end paradoxical discharge, respectively in air, SF6It is arranged in gas and transformer oil
End pressure-equalizing device annular in shape.
2. as described in claim 1 based on the high-voltage direct-current sleeve pressure-equalizing device of nonlinear conductance epoxy resin, characterized in that
Aluminium foil barrier is reduced to 23 layers, and every thickness degree 0.02mm, internal layer connects with guide rod, outer ground flange.
3. a kind of high-voltage direct-current sleeve method for equalizing voltage based on nonlinear conductance epoxy resin, characterized in that steps are as follows:
1) the every electrical, calorifics and underlying parameter of casing different materials are set；
The conductivity of ordinary epoxy resin is reduced to be only about the function of temperature[19],
γ0=45.4 [S/m] e-10860[K]/T (1)
2) using the silicon carbide or zinc oxide semiconductive filler of doping different proportion, the conductance of epoxy resin composite material is obtained
Rate is,
Wherein, EkFor nonlinear conductance threshold field strength temperature controlled, V/m；β is nonlinear conductance coefficient temperature controlled,
The measurement result of existing nonlinear material conductivity shows the nonlinear conductance threshold value E of nonlinear conductance insulating materialskWith it is non-thread
Property coefficient β is as temperature reduces, and on this basis, sets the E under different temperatureskAnd β；
3) finite element model of high-voltage direct-current sleeve is established, and mesh generation is carried out to model: setting an initial electricity first
Field distribution E0 (r, z) and thermo parameters method T0 (r, z), and determine according to formula (1) and (2) distribution of conductivity of casing fuse,
According to distribution of conductivity, E (r, z) is distributed with DC Steady field distribution equation calculation dielectric internal electric field.By medium
Joule heat is loaded into steady state heat transfer equation, and the thermo parameters method T (r, z) of casing is calculated, is calculated according to above step
Electric field and thermo parameters method amendment casing fuse distribution of conductivity, according to amendment attribute, again with field distribution equation
Field distribution is sought, and substitutes into and corrects thermo parameters method in heat transfer equation, repeatedly until adjacent iterate to calculate electric field twice
Meet control accuracy requirement with temperature gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910280800.6A CN110010312A (en) | 2019-04-09 | 2019-04-09 | High-voltage direct-current sleeve pressure-equalizing device and method based on nonlinear conductance epoxy resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910280800.6A CN110010312A (en) | 2019-04-09 | 2019-04-09 | High-voltage direct-current sleeve pressure-equalizing device and method based on nonlinear conductance epoxy resin |
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| Publication Number | Publication Date |
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| CN110010312A true CN110010312A (en) | 2019-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910280800.6A Pending CN110010312A (en) | 2019-04-09 | 2019-04-09 | High-voltage direct-current sleeve pressure-equalizing device and method based on nonlinear conductance epoxy resin |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112038015A (en) * | 2020-09-01 | 2020-12-04 | 沈阳工业大学 | Wall bushing of capacitive high-temperature solid electric heat storage device and design method |
| CN112735702A (en) * | 2020-12-03 | 2021-04-30 | 全球能源互联网研究院有限公司 | Direct current sleeve pressure-equalizing device based on low-conductivity temperature coefficient epoxy composite material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201392722Y (en) * | 2009-04-24 | 2010-01-27 | 西安爱博电气有限公司 | Resin impregnated paper capacitor-type transformer bushing |
| CN205050651U (en) * | 2015-08-19 | 2016-02-24 | 北京天威瑞恒高压套管有限公司 | High -tension bushing and isolated bus |
| CN106531418A (en) * | 2016-12-26 | 2017-03-22 | 山东彼岸电力科技有限公司 | Composite insulation oil immersion capacitive transformer bushing |
| CN107257116A (en) * | 2017-06-19 | 2017-10-17 | 清华大学 | Using the wall bushing of the equal laminated structure of nonlinear conductance composite |
-
2019
- 2019-04-09 CN CN201910280800.6A patent/CN110010312A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201392722Y (en) * | 2009-04-24 | 2010-01-27 | 西安爱博电气有限公司 | Resin impregnated paper capacitor-type transformer bushing |
| CN205050651U (en) * | 2015-08-19 | 2016-02-24 | 北京天威瑞恒高压套管有限公司 | High -tension bushing and isolated bus |
| CN106531418A (en) * | 2016-12-26 | 2017-03-22 | 山东彼岸电力科技有限公司 | Composite insulation oil immersion capacitive transformer bushing |
| CN107257116A (en) * | 2017-06-19 | 2017-10-17 | 清华大学 | Using the wall bushing of the equal laminated structure of nonlinear conductance composite |
Non-Patent Citations (3)
| Title |
|---|
| HONG-YANG ZHOU 等: "Impact of Temperature on Surface Charges Accumulation on Insulators in SF6-filled DC-GIL", 《IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION》 * |
| 张施令，彭宗仁，冯骅: "复合绝缘非线性电场的有限元迭代计算", 《电网技术》 * |
| 王飞风，张沛红，高铭泽: "纳米碳化硅/硅橡胶复合物非线性电导特性研究", 《物理学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112038015A (en) * | 2020-09-01 | 2020-12-04 | 沈阳工业大学 | Wall bushing of capacitive high-temperature solid electric heat storage device and design method |
| CN112038015B (en) * | 2020-09-01 | 2022-06-03 | 沈阳工业大学 | Design method of wall bushing of capacitive high-temperature solid electric heat storage device |
| CN112735702A (en) * | 2020-12-03 | 2021-04-30 | 全球能源互联网研究院有限公司 | Direct current sleeve pressure-equalizing device based on low-conductivity temperature coefficient epoxy composite material |
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