CN109494029B - Superconducting GIL insulator electric field homogenization method based on surface gradient conductance - Google Patents
Superconducting GIL insulator electric field homogenization method based on surface gradient conductance Download PDFInfo
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- 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
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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Abstract
The invention discloses a superconducting GIL insulator electric field homogenization method based on surface gradient conductance, which realizes electric field optimization by regulating and controlling the surface layer conductance distribution of a circular truncated cone insulator; the method comprises the following steps: (1) establishing an axial coordinate system of the insulator; (2) the surface conductivity sigma (z) of the insulator and the axial coordinate z of the insulator satisfy the following conditions: σ (z) ═ k (z-z)0)2+σ0Where k is a parameter to be optimized in the calculation, S/m2；z0Is the coordinate of the bottom surface of the insulator, m; sigma0Is the surface conductivity of the bottom of the insulator, S/m; (3) setting k to n different values respectively, wherein n is more than or equal to 2; (4) calculating the axial electric field distribution of the insulator under the direct-current voltage m kV by using an AC/DC module in COMSOL Multiphysics software; (5) according to the simulation result, when the integral distribution uniformity of the electric field is highest, the optimal parameter k is selected, namely the optimal gradient distribution of the surface conductivity is constructed, and the effect of homogenizing the electric field is the best at the moment.
Description
Technical Field
The invention belongs to the field of high-voltage equipment design and manufacture, and particularly relates to a superconducting GIL insulator electric field homogenizing method based on surface gradient conductance.
Background
High Temperature Superconducting (HTS) technology has attracted considerable attention to date due to its many advantages. At the same time, Gas Insulated Lines (GIL) have also made great progress in practical applications, and their electrical design may be referred to as superconducting gas insulated transmission lines (S-GIL) in HTS systems. According to the current research situation and the operation experience of the traditional GIL, under a direct current electric field, charges are always accumulated on the surface of an insulator when the direct current electric field operates for a long time, and electric field distortion at three joint points of a high-voltage electrode, a gas phase and the surface of the insulator can cause partial discharge and even flashover along the surface of the insulator, so that the safe operation of the whole system is greatly threatened. Therefore, there is an urgent need for suitable insulation designs to meet the requirements of gaseous cryogen HTS systems. The surface design is carried out on the circular truncated cone insulator, so that the circular truncated cone insulator has surface layer conductivity two-dimensional gradient distribution, the integral electric field distribution is homogenized, a new thought is provided for further improving the reliability of the GIL insulator, and the circular truncated cone insulator has great significance for promoting the further development of a direct-current power system.
The circular truncated cone insulator in the actual electrical system mostly adopts epoxy resin/Al2O3A composite material is provided which comprises a composite material,the invention aims at the circular truncated cone insulator, and designs and realizes the gradient distribution of the surface layer conductance of the circular truncated cone insulator, and the non-linear increase is realized from the grounding electrode to the high-voltage electrode so as to homogenize the electric field distribution of the circular truncated cone insulator. Research shows that the uniform degree of electric field distribution of the epoxy round platform insulator with the surface layer electric conduction showing the gradient distribution rule is obviously improved. Therefore, the design of the surface-layer conductivity gradient circular truncated cone insulator has important theoretical value and guiding significance for optimizing the insulating property of the S-GIL insulator and improving the whole reliability of a power transmission system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a superconducting GIL insulator electric field homogenizing method based on surface gradient conductance. According to the gradient design principle, the epoxy resin insulator has gradient distribution of surface layer conductance nonlinear increase, electric field distribution is optimized, and the insulation performance of the S-GIL insulator and the overall reliability of a power transmission system are improved.
The purpose of the invention is realized by the following technical scheme:
a superconducting GIL insulator electric field homogenization method based on surface gradient conductance comprises the following steps:
(1) establishing an axial coordinate system of the insulator;
(2) the surface conductivity sigma (z) of the insulator and the axial coordinate z of the insulator satisfy the following conditions: σ (z) ═ k (z-z)0)2+σ0Where k is a parameter to be optimized in the calculation, S/m2；z0Is the coordinate of the bottom surface of the insulator, m; sigma0Is the surface conductivity of the bottom of the insulator, S/m;
(3) setting k to n different values respectively, wherein n is more than or equal to 2;
(4) calculating the axial electric field distribution of the insulator under the direct-current voltage m kV by using an AC/DC module in COMSOL Multiphysics software;
(5) according to the simulation result, when the integral distribution uniformity of the electric field is highest, the optimal parameter k is selected, namely the optimal gradient distribution of the surface conductivity is constructed, and the effect of homogenizing the electric field is the best at the moment.
Furthermore, the surface layer conductance of the circular truncated cone insulator is in gradient distribution, and the surface layer conductance of the circular truncated cone insulator is increased in a nonlinear mode from the grounding electrode to the high-voltage electrode along the axial direction of the circular truncated cone insulator.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the invention designs the surface conductivity distribution of the epoxy resin insulator in a gradient manner to obtain the insulator with the surface conductivity in nonlinear increasing distribution, regulates the electric field distribution and achieves the purpose of improving the performance of the insulator. Therefore, the method has important value and significance for optimizing the performance of the insulator in the GIL system and the overall safety and reliability of the power transmission system.
Drawings
FIG. 1 shows the gradient distribution of the nonlinear increase of the surface conductance of the epoxy resin circular truncated cone insulator.
Fig. 2 is a diagram of the electric field distribution of the insulator.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A superconducting GIL insulator electric field homogenization method based on surface gradient conductance realizes electric field optimization by regulating and controlling the surface layer conductance distribution of a truncated cone insulator; the surface layer conductance of the circular truncated cone insulator is in gradient distribution, and the surface layer conductance of the circular truncated cone insulator is increased in a nonlinear mode from the grounding electrode to the high-voltage electrode along the axial direction of the insulator, as shown in figure 1. The specific implementation steps are as follows:
1. an insulator axial coordinate system is established, an axial coordinate z is increased from the bottom surface to the upper surface of the insulator, and-4 < z < 0 (cm).
2. The surface conductivity sigma (z) of the insulator and the axial coordinate z of the insulator satisfy the following conditions: σ (z) ═ k (z-z)0)2+σ0Where k is a parameter to be optimized in the calculation, S/m2；z0Is the coordinate of the bottom surface of the insulator, m; sigma0Is the surface conductivity of the bottom of the insulator, S/m.
3. K is set to 8 different values respectively: 0. 0.5E-19, 1E-19, 1.5E-19, 2E-19, 2.5E-19, 3E-19, 3.5E-19S/m2。
4. And calculating the electric field distribution of the insulator along the axial direction under the direct-current voltage of 150kV by utilizing an AC/DC module in COMSOL Multiphysics software.
5. According to simulation results, when the integral distribution uniformity of the electric field is highest, selecting an optimal parameter k, namely k is 1.5E-19S/m2The best results were obtained when the surface gradient conductance homogenized the electric field, see figure 2.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A superconducting GIL insulator electric field homogenization method based on surface gradient conductance is characterized by comprising the following steps:
(1) establishing a circular truncated cone insulator axial coordinate system;
(2) the surface conductivity sigma (z) of the round platform insulator and the axial coordinate z of the round platform insulator meet the following conditions: σ (z) ═ k (z-z)0)2+σ0Where k is a parameter to be optimized in the calculation, S/m2；z0Is the coordinate m of the bottom surface of the circular truncated cone insulator; sigma0Is the surface conductivity of the insulator bottom, S;
(3) setting k to n different values respectively, wherein n is more than or equal to 2;
(4) calculating the axial electric field distribution of the circular truncated cone insulator under the direct-current voltage m kV by using an AC/DC module in COMSOL Multiphysics software;
(5) according to the simulation result, when the integral distribution uniformity of the electric field is highest, the optimal parameter k is selected, namely the optimal gradient distribution of the surface conductivity is constructed, and the effect of homogenizing the electric field is the best at the moment.
2. The superconducting GIL insulator electric field homogenization method based on surface gradient conductance of claim 1, wherein the surface layer conductance of the circular truncated cone insulator is in gradient distribution, and the surface layer conductance of the circular truncated cone insulator increases nonlinearly from a grounding electrode to a high-voltage electrode along the axial direction of the circular truncated cone insulator.
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| CN111460642B (en) * | 2020-03-25 | 2022-07-01 | 天津大学 | High-voltage GIL gas-solid interface electric field distribution optimization method |
| CN113470907B (en) * | 2021-06-23 | 2022-07-12 | 西安交通大学 | Method for inhibiting partial discharge at flange of GIS/GIL supporting insulator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11126526A (en) * | 1997-10-23 | 1999-05-11 | Toshiba Corp | Gas bushing |
| CN105137298A (en) * | 2015-08-25 | 2015-12-09 | 国家电网公司 | Transmission line suspension insulator string external insulation state assessment method |
| CN105243239A (en) * | 2015-11-10 | 2016-01-13 | 南通河海大学海洋与近海工程研究院 | Method for composite insulator electric field optimization of power transmission line |
| WO2017035533A1 (en) * | 2015-08-27 | 2017-03-02 | Massachusetts Institute Of Technology | Guided-wave photodetector apparatus employing mid-bandgap states of semiconductor materials, and fabrication methods for same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11126526A (en) * | 1997-10-23 | 1999-05-11 | Toshiba Corp | Gas bushing |
| CN105137298A (en) * | 2015-08-25 | 2015-12-09 | 国家电网公司 | Transmission line suspension insulator string external insulation state assessment method |
| WO2017035533A1 (en) * | 2015-08-27 | 2017-03-02 | Massachusetts Institute Of Technology | Guided-wave photodetector apparatus employing mid-bandgap states of semiconductor materials, and fabrication methods for same |
| CN105243239A (en) * | 2015-11-10 | 2016-01-13 | 南通河海大学海洋与近海工程研究院 | Method for composite insulator electric field optimization of power transmission line |
Non-Patent Citations (1)
| Title |
|---|
| 500 kV直流GIL支撑绝缘子的电场优化;贾志杰等;《高压电器》;20100630;第46卷(第6期);第18-24页 * |
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