CN112735702A - Direct current sleeve pressure-equalizing device based on low-conductivity temperature coefficient epoxy composite material - Google Patents
Direct current sleeve pressure-equalizing device based on low-conductivity temperature coefficient epoxy composite material Download PDFInfo
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- CN112735702A CN112735702A CN202011394072.0A CN202011394072A CN112735702A CN 112735702 A CN112735702 A CN 112735702A CN 202011394072 A CN202011394072 A CN 202011394072A CN 112735702 A CN112735702 A CN 112735702A
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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
- H01B17/56—Insulating bodies
- H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
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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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Abstract
The invention relates to a direct current bushing voltage-sharing device based on an epoxy composite material with a low temperature coefficient of conductivity, which is technically characterized in that: the current-carrying conductor is arranged in the center of the sleeve, the outer conductor is coaxially arranged outside the current-carrying conductor, a thermal insulation air gap is arranged between the current-carrying conductor and the outer conductor, an epoxy capacitor core is wrapped outside the outer conductor, voltage-sharing aluminum foil is arranged inside the epoxy capacitor core, the sleeve capacitor core is positioned inside the sleeve, and SF is filled between the sleeve capacitor core and the sleeve6An insulating gas; the metal flanges are arranged at the lower end of the sleeve and outside the sleeve capacitor core, and the lower end of the sleeve capacitor core is immersed in the transformer oil. After the epoxy resin in the high-voltage direct-current bushing is replaced by the epoxy resin composite material with low temperature coefficient of conductivity, the electric field in the capacitor core is remarkably homogenized,the maximum radial and axial electric field intensity is effectively reduced, and the electric field distortion is weakened.
Description
Technical Field
The invention belongs to the technical field of high-voltage direct-current bushings, and particularly relates to a direct-current bushing voltage-sharing device based on an epoxy composite material with a low temperature coefficient of conductivity.
Background
The high-voltage direct-current sleeve is used as key equipment of a converter station, and the safe and reliable operation of the high-voltage direct-current sleeve is directly related to the stability of a direct-current transmission system. However, in actual operation, the bushing capacitor core is subjected to the combined action of electrothermal coupling, which becomes the main cause of its failure.
The direct current sleeve usually adopts the design mode of an alternating current sleeve, namely a design method of equal capacitance and equal steps, and the method can ensure that the axial field intensity and the radial field intensity inside the capacitor core are uniformly distributed. However, under nominal operating conditions, joule heating and dielectric loss of the current carrying conductor form a temperature gradient inside the capacitor core. Under such a temperature gradient, a uniform conductivity profile is transformed into a radially decreasing conductivity profile, the conductivity gradient of which is often up to several orders of magnitude higher. In this case, the use of the capacitor core made of pure epoxy resin material results in an electric field increasing in the radial direction, and the maximum field strength in the radial direction is as high as 9.3kV/mm and higher than the designed field strength of 8kV/mm, which is very easy to cause discharge.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a direct current bushing voltage-sharing device based on an epoxy composite material with a low temperature coefficient of conductivity, and solves the problem of electric field distortion of a high-voltage direct current bushing caused by temperature gradient.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a direct current bushing voltage-sharing device based on an epoxy composite material with a low temperature coefficient of electrical conductivity comprises a bushing, a bushing capacitor core, a metal flange, a current-carrying conductor and an outer conductor, wherein the current-carrying conductor is arranged in the center of the bushing, the outer conductor is coaxially arranged outside the current-carrying conductor, a thermal insulation air gap is arranged between the current-carrying conductor and the outer conductor, and the epoxy capacitor core is used for wrapping around the outer conductor; the multilayer coaxial voltage-sharing aluminum foil is wrapped inside an epoxy capacitor core, the sleeve capacitor core is made of epoxy resin/graphene oxide nano composite insulating materials, the sleeve capacitor core is arranged between an outer conductor and a metal flange and positioned inside a sleeve, and SF is filled between the sleeve capacitor core and the sleeve6An insulating gas; the metal flange is arranged at the lower end of the sleeve and outside the sleeve capacitor core, the sleeve and the converter transformer oil tank are fixed together by the metal flange as a fixing device, and the lower end of the sleeve capacitor core is immersed in the transformer oil.
Further, the grading rings are installed at the upper end and the lower end of the sleeve, the inner grading ring is installed inside the upper end of the sleeve, and the current-carrying conductor is installed in the center of the sleeve and is fixed with the grading rings at two ends.
Further, the current-carrying conductor is a hollow structure.
Further, the voltage-sharing aluminum foil is 15 layers, wherein the outermost layer is connected with a metal flange.
Further, the voltage-sharing aluminum foil is of an equal-capacitance and equal-step structure.
Further, the outer umbrella skirt of the sleeve is made of a silicon rubber composite insulating material.
Furthermore, the lower end of the sleeve capacitor core is in a stepped layered structure.
The invention has the advantages and positive effects that:
1. the invention has reasonable design, the electric field in the capacitor core is obviously homogenized after the epoxy resin in the high-voltage direct-current bushing is replaced by the epoxy resin composite material with the low-conductivity temperature coefficient, the electric field strength in the maximum radial direction and the axial direction is effectively reduced and controlled within the designed field strength, and the effect of electric field distortion is effectively weakened by the epoxy resin composite material with the low-conductivity temperature coefficient through the electro-thermal coupling simulation verification.
2. The inner equalizing rings are arranged at the upper end, the lower end and the inner part of the sleeve, so that abnormal discharge can be effectively prevented, and the normal and stable operation of the converter transformer is ensured.
Drawings
FIG. 1 is a structural diagram of a high-voltage direct-current bushing voltage-sharing device according to the invention;
FIG. 2 is an enlarged view of part A of FIG. 1;
FIG. 3 is a time-voltage waveform diagram of a converter transformer valve side bushing using the device under a rated working condition;
FIG. 4 is a graph of the electric field distribution of a bushing capacitor core using different insulating materials, wherein (a) is constant conductivity; (b) is an epoxy resin material; (c) is EP/GO-0.05; (d) EP/GO-0.1& 0.5; (EP/GO-the latter figure being the weight content wt% of the filler)
FIG. 5 is a radial electric field distribution diagram for a bushing capacitor core using different insulating materials;
FIG. 6 is a graph of the axial electric field distribution of a bushing capacitor core using different insulating materials;
in the figure, 1-grading ring, 2-sleeve, 3-inner grading ring, 4-Sleeve capacitor core, 5-voltage-sharing aluminum foil, 6-metal flange, 7-transformer oil, 8-air, 9-current-carrying conductor, 10-SF6Gas, 11-air gap, 12-outer conductor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A direct current sleeve voltage-sharing device based on an epoxy composite material with a low temperature coefficient of electrical conductivity is shown in figures 1 and 2 and comprises a sleeve 2, a sleeve capacitor core 4, a metal flange 6, a current-carrying conductor 9 and an outer conductor 12. The sleeve pipe outside is outer full skirt, all installs equalizer ring 1 in sleeve pipe upper end, lower extreme, and equalizer ring 3 in sleeve pipe upper end internally mounted can be used for preventing abnormal discharge. The current-carrying conductor is arranged in the center of the sleeve, two ends of the current-carrying conductor are fixed with the equalizing ring, the current-carrying conductor is of a hollow structure, air 8 is arranged in the center of the current-carrying conductor, and epoxy impregnated paper is used for wrapping the current-carrying conductor. The outer conductor is coaxially arranged outside the current-carrying conductor, a thermal insulation air gap 11 is arranged between the current-carrying conductor and the outer conductor, voltage-sharing aluminum foils 5 are wound outside the outer conductor in an equal capacitance and equal step mode, wherein the innermost aluminum foil is connected with the outer conductor, and the outermost aluminum foil is grounded through a metal flange. The sleeve capacitor core is arranged outside the voltage-sharing aluminum foil and the outer conductor, the upper end of the sleeve capacitor core is positioned inside the sleeve, and SF is filled between the sleeve capacitor core and the sleeve6An insulating gas 10. The metal flange is arranged at the lower end of the sleeve and outside the capacitor core, the sleeve and the converter transformer oil tank are fixed together by the metal flange as a fixing device, and the capacitor core of the sleeve in the converter transformer oil tank is in a stepped layer shape and is immersed in transformer oil 7.
In the invention, an epoxy capacitor core is wrapped around the outer conductor and a screen aluminum foil is wrapped around the outer conductor to be used as main insulation; SF between capacitor core and sleeve6An insulating gas as an auxiliary insulation; the outer umbrella skirt of the sleeve is made of silicon rubber composite insulating material and serves as external insulation.
In this embodiment, the capacitor core uses an epoxy/graphene oxide nanocomposite insulating material as an insulating material.
The application effect of the invention is verified by electrothermal coupling finite element simulation.
Simulation tests were carried out using a 800kV converter transformer valve side bushing. The total length of the bushing is 13500mm, the inner diameter of the current-carrying conductor is 40mm and the outer diameter is 120 mm. The inner diameter of the outer conductor is 130mm and the outer diameter is 160 mm. A thermal insulation air gap with the thickness of 5mm is arranged between the current-carrying conductor and the outer conductor. The capacitor core thickness is 265 mm. The upper part of the sleeve and the grounding flange are positioned in the valve hall, and the lower end of the sleeve is immersed in the transformer oil. In order to avoid electric field distortion, grading rings are arranged at the upper end, the lower end and the inner part of the sleeve to realize grading. In order to ensure that the field intensity inside the capacitor core is uniformly distributed, an aluminum foil shield is designed and is coaxially embedded into the capacitor core in the winding process. The radii and lengths of the aluminum foils were designed and calculated according to the equal capacitance equal step method. The aluminum foil in the simulation was reduced to 15 layers in consideration of calculation time and calculation resources. Table 1 gives the detailed parameters of the electric heating of the material; table 2 gives the detailed thermo-fluidic parameters of the materials;
TABLE 1 Sleeve pipe electric heating simulation parameter table
TABLE 2 thermal-flow simulation parameter table for casing
As the conductivity of the sleeve capacitor core is insensitive to the electric field intensity under the actual operation working condition, the epoxy resin and the epoxy resin/graphene oxide (EP/GO) nano composite insulating material are simplified into functions only related to the temperature
Wherein W represents activation energy, kBRepresenting Boltzmann coefficients, 1.3807 × 10-23J/K, T represents temperature (K). Table 3 shows the epoxy resin/graphene oxideConductivity function of the nanocomposite insulation, wherein the number behind EP/GO is the weight content wt% of the filler;
TABLE 3 temperature and conductivity function chart of EP/GO nano composite insulating material
In the above table, EP/GO is an epoxy resin/graphene oxide nanocomposite insulating material, and EP/GO-post numbers represent the additive content, respectively representing 0.05 wt%,. 0.1 wt%, and 0.5 wt%.
Establishing a finite element model of a plus or minus 800kV converter transformer valve side sleeve, and setting materials by using data in tables 1 and 2;
carrying out electric field simulation setting:
the current carrying conductor and the outer conductor are set to actual operating voltages, and the waveform diagram is shown in FIG. 3; the grounding flange is set to zero potential; the aluminum foil shielding layer in the capacitor core is set to be a suspension potential; to simulate the actual situation, the outside air domain of the casing is set to the infinite element domain.
Carrying out thermal field simulation setting:
the current-carrying conductor, the outer conductor, the capacitor core, the flange, the outer umbrella and the grading ring are arranged to be solid for heat transfer; air, SF6The insulating gas and the transformer oil are arranged to transfer heat by fluid; the contact part of the sleeve with air and transformer oil is set to be natural convection heat transfer; SF inside the casing6The insulating gas is set to be a laminar flow model; according to the test standard, air and transformer oil are set to an isothermal zone of 50 ℃ and 90 ℃.
Performing heat source setting:
wherein Q is1Representing heat generation of the guide bar, Q2Representing the dielectric loss of the insulation. P0Is the Joule heating power (W), and V is the conductor volume (m)3)，IAIs effective value of current 4500(A), and beta is skin effect coefficientλ is conductor resistivity (Ω · m), α is temperature coefficient of resistivity (1/K), T is conductor temperature (K), L is conductor length (m), and S is conductor (m)2) γ is the conductivity of the insulation (S/m) and E is the electric field (V/m). It is to be noted that since the loss generated by the ac component of the voltage is small compared to the total loss, it is omitted here.
After all conditions are set, subdivision of a geometric domain is carried out, a field concentration position is finely subdivided, and other parts are roughly subdivided, so that the calculation time and the calculation resources are saved; and finally, performing electrothermal coupling simulation to obtain an electric field simulation result.
The following tests can be carried out:
fig. 4 shows the internal field strength distribution of the core of a bushing capacitor using different insulating materials, and for comparative analysis the electric field distribution at constant conductivity is also given. As can be seen from fig. 4, the electric field distribution is relatively uniform at constant conductivity; the electric field using pure epoxy generates severe distortion in the radial direction; the electric field of the epoxy resin/graphene oxide nano composite insulating material becomes more uniform, the effect of the uniform electric field is stronger with the increase of the filler content, but the effect of the addition weight content reaching 0.1 wt% tends to be stable. Fig. 5 and 6 show radial and axial electric field distributions of capacitor cores using different materials, and the selected radial and axial positions are shown in fig. 1. It can be seen that the electric field using pure epoxy resin produces severe distortion, the maximum radial direction, the upper and lower end axial electric fields reach 9.30,0.65 and 1.30 kV/mm; the electric field of EP/GO-0.1&0.5 is used to obtain effective electric field homogenization, the maximum radial direction, the axial electric field of the upper end and the lower end reach 6.40, 0.46 and 0.93kV/mm, the axial electric field is respectively reduced by 31 percent, 29 percent and 28 percent, and the electric field distortion is effectively weakened.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (7)
1. The utility model provides a direct current sleeve pipe voltage-sharing device based on low conductance temperature coefficient epoxy combined material which characterized in that: the capacitor comprises a sleeve, a sleeve capacitor core, a metal flange, a current-carrying conductor and an outer conductor, wherein the current-carrying conductor is arranged in the center of the sleeve, the outer conductor is coaxially arranged outside the current-carrying conductor, a thermal insulation air gap is arranged between the current-carrying conductor and the outer conductor, and the epoxy capacitor core is used for wrapping around the outer conductor; the multilayer coaxial voltage-sharing aluminum foil is wrapped inside an epoxy capacitor core, the sleeve capacitor core is made of epoxy resin/graphene oxide nano composite insulating materials, the sleeve capacitor core is arranged between an outer conductor and a metal flange and positioned inside a sleeve, and SF is filled between the sleeve capacitor core and the sleeve6An insulating gas; the metal flange is arranged at the lower end of the sleeve and outside the sleeve capacitor core, the sleeve and the converter transformer oil tank are fixed together by the metal flange as a fixing device, and the lower end of the sleeve capacitor core is immersed in the transformer oil.
2. The direct current bushing voltage-sharing device based on the epoxy composite material with low temperature coefficient of electrical conductivity according to claim 1, wherein: grading rings are installed at the upper end and the lower end of the sleeve, an inner grading ring is installed inside the upper end of the sleeve, and the current-carrying conductor is installed in the center of the sleeve and is fixed with the grading rings at two ends.
3. The direct current bushing voltage-sharing device based on the low-conductivity temperature coefficient epoxy composite material according to claim 1 or 2, characterized in that: the current-carrying conductor is of a hollow structure.
4. The direct current bushing voltage-sharing device based on the low-conductivity temperature coefficient epoxy composite material according to claim 1 or 2, characterized in that: the pressure-equalizing aluminum foil is 15 layers, wherein the outermost layer is connected with a metal flange.
5. The direct current bushing voltage-sharing device based on the low-conductivity temperature coefficient epoxy composite material according to claim 1 or 2, characterized in that: the voltage-sharing aluminum foil is of an equal-capacitance equal-step structure.
6. The direct current bushing voltage-sharing device based on the low-conductivity temperature coefficient epoxy composite material according to claim 1 or 2, characterized in that: the outer umbrella skirt of the sleeve is made of silicon rubber composite insulating materials.
7. The direct current bushing voltage-sharing device based on the low-conductivity temperature coefficient epoxy composite material according to claim 1 or 2, characterized in that: the lower end of the sleeve capacitor core is in a stepped layered structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011394072.0A CN112735702A (en) | 2020-12-03 | 2020-12-03 | Direct current sleeve pressure-equalizing device based on low-conductivity temperature coefficient epoxy composite material |
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| CN202011394072.0A CN112735702A (en) | 2020-12-03 | 2020-12-03 | Direct current sleeve pressure-equalizing device based on low-conductivity temperature coefficient epoxy composite material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114050532A (en) * | 2021-09-22 | 2022-02-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | 800kV flexible direct-current wall bushing |
| CN114295669A (en) * | 2021-12-15 | 2022-04-08 | 西南交通大学 | Method for calculating natural convection cooling characteristic coefficient of inclined transformer bushing |
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