CN112199834A - Scaling test method for +/-1100 kV extra-high voltage direct-current composite insulator - Google Patents
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Abstract
The invention relates to a +/-1100 kV extra-high voltage direct current composite insulator scaling test method, which comprises the following steps: 1. establishing an electric field calculation model of a true +/-1100 kV extra-high voltage direct-current composite insulator, and calculating an electric field and potential of the electric field calculation model to obtain the electric field and potential distribution of the electric field and potential; 2. deducing a scaling formula of the +/-1100 kV extra-high voltage direct-current composite insulator based on a similar theory, and establishing a scaling model of the extra-high voltage direct-current composite insulator; 3. calculating the electric field and the electric potential of the sample on the basis of a scaling model to obtain the electric field and the electric potential distribution of the sample; 4. and calculating the Pearson correlation coefficient of the electric field and the potential distribution of the true model and the scaling model, and verifying the scaling coefficient. The method solves the problems of insufficient true test conditions, high test cost, long period and the like of the current +/-1100 kV ultrahigh voltage direct current composite insulator, and fills the blank of scale test research of the +/-1100 kV ultrahigh voltage direct current composite insulator.
Description
Technical Field
The invention belongs to the technical field of extra-high voltage direct current transmission, and particularly relates to a +/-1100 kV extra-high voltage direct current composite insulator scaling test method.
Background
The Changji-ancient spring +/-1100 kV extra-high voltage project is an extra-high voltage direct current transmission project which has the highest voltage level, the largest transmission capacity, the farthest transmission distance and the most advanced technical level in the world at present, wherein the application of the composite insulator greatly reduces the pollution flashover accidents of a transmission line, lightens the heavy cleaning and zero value detection work of the original polluted area, and becomes one of the most effective methods for solving the problem of the external insulation pollution flashover of the transmission line in the polluted area in China. However, in actual operation, the composite insulator gradually deteriorates under the combined action of electricity, machinery and the external environment, and how to detect and evaluate the overall operation performance of the composite insulator in real time is a difficult problem to be solved urgently.
At present, practical operation experience for +/-1100 kV ultrahigh-voltage direct-current composite insulators at home and abroad is lacking, only few units have the real type test research conditions of the +/-1100 kV ultrahigh-voltage direct-current composite insulators, but the real type test cost is high, and the period is long. Therefore, it is necessary to perform a scaling test study on the ± 1100kV dc composite insulator based on a similar theory. However, no technical report on the aspect exists at present.
Disclosure of Invention
The invention aims to provide a +/-1100 kV extra-high voltage direct current composite insulator scaling test method which is beneficial to saving test cost and shortening test period.
In order to achieve the purpose, the invention adopts the technical scheme that: a +/-1100 kV extra-high voltage direct current composite insulator scaling test method comprises the following steps:
step 1: establishing an electric field calculation model of a true +/-1100 kV extra-high voltage direct-current composite insulator, and calculating an electric field and potential of the electric field calculation model to obtain the electric field and potential distribution of the electric field and potential;
step 2: deducing a scaling formula of the +/-1100 kV extra-high voltage direct-current composite insulator based on a similar theory, and establishing a scaling model of the extra-high voltage direct-current composite insulator;
and step 3: calculating the electric field and the electric potential of the sample on the basis of a scaling model to obtain the electric field and the electric potential distribution of the sample;
and 4, step 4: and calculating the Pearson correlation coefficient of the electric field and the potential distribution of the true model and the scaling model, and verifying the scaling coefficient.
Further, in the step 1, COMSOL software is adopted to calculate the electric field and the electric potential of the true +/-1100 kV ultrahigh-voltage direct-current composite insulator.
Further, in the step 2, according to the study of electric field and potential distribution characteristics of the ± 1100kV ultrahigh voltage direct current composite insulator, a maxwell equation set is selected as a characteristic equation set, and then a scaling formula is derived from the maxwell equation set based on a similar theory including a similar constant, a similar index, a similar criterion and a similar three-major theorem.
Further, based on the similarity theory, the specific method for carrying out scaling formula derivation on the maxwell equation set is as follows:
if each physical quantity of the scaling model is in a form of ()', the scaling model should satisfy the following maxwell equations:
assuming that the similarity factor of the original model is k, the scaled model parameter is expressed as () ═ k()() ', where () ' denotes the relevant physical quantities of the scaled model, the Maxwell's system of equations for the scaled model can be expressed as:
according to a similar theory, the similar relation of the equation set is obtained as follows:
taking the length, the current, the dielectric constant and the conductivity as basic scaling factors, obtaining the following scaling formula:
further, when a scaling model is established, the dielectric constant epsilon of the scaling model is completely the same as that of the original model, the scaling model is modeled according to the same structural composition, and the size of the scaling model is set according to the selected similarity factor.
Further, in step 3, based on the established scaling model, applying a voltage corresponding to the similarity factor to the insulator, and performing electric field and potential calculation to obtain electric field and potential distribution thereof, so as to compare with the original model and verify the scaling coefficient.
Further, in the step 4, when the validity of the scaling factor is verified, the pearson correlation factor of the electric field and the electric potential distribution of the original model and the scaling model is calculated.
Compared with the prior art, the invention has the following beneficial effects: the method establishes a scaling model based on a similar theory, can better ensure the consistency with the original model, and solves the problems of high test cost, long period and the like of the true +/-1100 kV ultrahigh voltage direct current composite insulator. The defect detection is carried out through the obtained scaling model, the potential safety hazard of the operation of the +/-1100 kV ultrahigh-voltage direct-current transmission line can be reduced, effective precaution strategies and technical means are provided for preventing the composite insulator brittle failure and the string breakage failure, the loss caused by the unplanned power failure is reduced, the continuous power supply capacity, the stability and the safe operation level of a power grid are improved, the power consumption quality of a user side is improved, and the power consumption satisfaction degree of the user is improved.
Drawings
FIG. 1 is a flow chart of a method implementation of an embodiment of the present invention.
FIG. 2 is a model of a +/-1100 kV ultrahigh-voltage direct-current composite insulator prototype model by utilizing COMSOL software in the embodiment of the invention.
FIG. 3 is an electric field/potential distribution diagram of the original model of the + -1100 kV extra-high voltage DC composite insulator in the embodiment of the invention.
FIG. 4 is a graph of electric field/potential curves of the original model of the + -1100 kV extra-high voltage DC composite insulator in the embodiment of the present invention.
FIG. 5 is a model of a +/-1100 kV extra-high voltage direct current composite insulator scaling model by utilizing COMSOL software in the embodiment of the invention.
FIG. 6 is an electric field/potential distribution diagram of a +/-1100 kV extra-high voltage direct current composite insulator scaling model in the embodiment of the invention.
FIG. 7 is a graph of electric field/potential curves of a +/-1100 kV extra-high voltage direct-current composite insulator scaling model in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Referring to fig. 1, the invention provides a +/-1100 kV extra-high voltage direct current composite insulator scaling test method, which comprises the following steps:
step 1: and establishing an electric field calculation model of the true +/-1100 kV extra-high voltage direct current composite insulator, and performing electric field/potential calculation on the electric field/potential calculation model to obtain the electric field/potential distribution of the electric field/potential.
Wherein, COMSOL software is adopted to calculate the electric field/potential of the true +/-1100 kV ultrahigh voltage direct current composite insulator. Establishing a true model +/-1100 kV extra-high voltage direct current composite insulator model, wherein the material is as follows: the sheath is made of silicon rubber, the core rod is made of resin material, the end hardware is made of 40Cr forged steel, and the grading ring is made of metal aluminum material and has a corresponding dielectric constant. The boundary/excitation conditions were set to a voltage of ± 1100kV at the high-voltage side end fitting and the grading ring, 0kV at the low-voltage side end fitting and the grading ring, and the air-domain, mesh generation and solver settings.
Step 2: based on a similar theory, a scaling formula of the +/-1100 kV ultrahigh voltage direct current composite insulator is deduced, and a scaling model of the ultrahigh voltage direct current composite insulator is established.
Firstly, according to the research of the electric field/potential distribution characteristics of the +/-1100 kV ultrahigh voltage direct current composite insulator, a Maxwell equation set is selected as a characteristic equation set, and then the derivation of a scaling formula is carried out on the Maxwell equation set on the basis of a similar theory.
Wherein, maxwell equation set is:
in the formula, J ═ σ E, D ═ E, and B ═ μ H. Here,. epsilon.,. mu.and. gamma. represent the dielectric constant, permeability and conductivity, respectively, and E and D represent the electric field intensity and electric flux density, respectively.
The similarity theory comprises a similarity constant, a similarity index, a similarity criterion, a similarity three theorems and the like.
The similarity constant refers to a ratio at which the corresponding physical quantity remains unchanged at all corresponding points and corresponding times in two similar systems.
The similarity index refers to the relation of system-related physical quantity transformation coefficients.
A similarity criterion refers to a quantity in one system that has different values at different points in the system, but that remains the same at the corresponding points and at the corresponding times when this system is converted to another system similar to it.
A similar first law means that the relation between some physical quantities within a system in a similar system is constant.
The similarity second theorem refers to phenomena similar to each other, and similarity criteria at corresponding points and corresponding moments are equal.
The third theorem of similarity refers to that for the same type of physical phenomena, the phenomena are similar if the singular-valued conditions are similar and the similarity criterion consisting of the physical quantities of the singular-valued conditions is numerically equal.
The specific method for deducing the scaling formula from the Maxwell equation set based on the similarity theory comprises the following steps:
if each physical quantity of the scaling model is in a form of ()', the scaling model should satisfy the following maxwell equations:
assuming that the similarity factor of the original model is k, the scaled model parameter is expressed as () ═ k()() ', wherein ()' denotes the relevant physical quantity of the scaling model, e.g. E ═ kBE ', the electric field strength of the actual model is E ', the electric field strength of the scaled model is E ', and the corresponding similarity factor is kBThe maxwell equation set of the scaled model can be:
according to a similar theory, the similar relation of the equation set is obtained as follows:
taking the length, the current, the dielectric constant and the conductivity as basic scaling factors, obtaining the following scaling formula:
the present invention focuses on the partial scaling relational expressions related to the electric field, that is, the electric field strength E, the dielectric constant E, the electric flux density D, and the like. When the scaling model is established, the dielectric constant epsilon of the scaling model is completely the same as that of the true model, namely the original model, the scaling model is modeled according to the same structural composition, and the size of the scaling model is set according to the selected similarity factor.
And step 3: and based on the scaling model, applying voltage corresponding to the similarity factor to the insulator, and performing electric field/potential calculation to obtain electric field/potential distribution of the insulator so as to compare the electric field/potential distribution with the original model and verify the scaling coefficient.
And 4, step 4: and calculating the Pearson correlation coefficient of the electric field/potential distribution of the true model and the scale model, and verifying the scale coefficient.
When corresponding software is used for modeling a scaling model, geometric parameters are all 1/N of the original model, the voltage applied by the end fitting on the high-voltage side and the equalizing ring is +/-1100/N kV, the potential of the end fitting on the low-voltage side and the equalizing ring is set to be 0kV, and the dielectric constant of each component is consistent with the original model.
And comparing whether the electric field/potential distribution of the obtained scaling model is consistent with that of the original model or not, wherein the scaling coefficient is effective when the Pearson correlation coefficient of the two electric fields/potentials is greater than 0.9.
The beneficial effects of the invention are further illustrated by taking the scaling test method of FXBZ- +/-1100 kV/300(240) extra-high voltage direct current composite insulator as an example.
1) And performing electric field/potential calculation on the true +/-1100 kV ultrahigh voltage direct current composite insulator by adopting COMSOL software. The method comprises the following steps of establishing a true +/-1100 kV extra-high voltage direct current composite insulator model, wherein the materials are as follows: the sheath is made of silicon rubber, and the dielectric constant is set to be 3.5; the core rod is made of resin material, and the dielectric constant is set to be 4.8; the end fittings were 40Cr forged steel and the grading rings were made of metallic aluminum material, as shown in fig. 2. The boundary/excitation condition was set such that the voltage of ± 1100kV was set to the high-voltage side end fitting and the equalizing ring, and the potential of the low-voltage side end fitting and the equalizing ring was set to 0 kV. And adopting extremely-refined grid subdivision and software default solver parameters. After running calculation, the electric field/potential distribution and the curve chart of the original model are obtained, which are respectively shown in fig. 3 and 4.
2) And selecting a scaling number of 1/10 according to the deduced scaling formula, scaling the geometric dimension to 1/10 of the original model, keeping the dielectric constant epsilon of each component structure consistent with that of the original model, and establishing the scaling model.
3) Geometric modeling is carried out on the scaling model, as shown in fig. 5, the material setting, the grid subdivision and the solver are all consistent with the original model, the boundary condition/excitation setting is that the voltage of +/-110 kV is set for the high-voltage side end fitting and the equalizing ring, the potential of the low-voltage side end fitting and the equalizing ring is set to be 0kV, and the electric field/potential distribution and the curve graph of the scaling model are obtained after operation and calculation, as shown in fig. 6 and 7 respectively.
4) And comparing the Pearson correlation coefficients of the electric field intensity and the electric potential of the calculated scaling model and the original model, wherein the Pearson correlation coefficients are respectively 0.987 and 0.972, and are both more than 0.9, and verifying that the scaling coefficient is 1/10 and has effectiveness, thereby demonstrating the equivalence of the + -1100 kV ultrahigh-voltage direct-current composite insulator scaling test method.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (7)
1. A +/-1100 kV extra-high voltage direct current composite insulator scaling test method is characterized by comprising the following steps:
step 1: establishing an electric field calculation model of a true +/-1100 kV extra-high voltage direct-current composite insulator, and calculating an electric field and potential of the electric field calculation model to obtain the electric field and potential distribution of the electric field and potential;
step 2: deducing a scaling formula of the +/-1100 kV extra-high voltage direct-current composite insulator based on a similar theory, and establishing a scaling model of the extra-high voltage direct-current composite insulator;
and step 3: calculating the electric field and the electric potential of the sample on the basis of a scaling model to obtain the electric field and the electric potential distribution of the sample;
and 4, step 4: and calculating the Pearson correlation coefficient of the electric field and the potential distribution of the true model and the scaling model, and verifying the scaling coefficient.
2. The +/-1100 kV extra-high voltage direct current composite insulator scaling test method according to claim 1, characterized in that in the step 1, COMSOL software is adopted to perform electric field and potential calculation on a true +/-1100 kV extra-high voltage direct current composite insulator.
3. The + -1100 kV extra-high voltage direct current composite insulator scaling test method as claimed in claim 1, wherein in the step 2, according to the study on electric field and potential distribution characteristics of the + -1100 kV extra-high voltage direct current composite insulator, a Maxwell equation set is selected as a characteristic equation set, and then the scaling formula is derived from the Maxwell equation set based on a similar theory including a similar constant, a similar index, a similar criterion and a similar three-major theorem.
4. The + -1100 kV extra-high voltage direct-current composite insulator scaling test method of claim 3, wherein based on a similarity theory, a specific method for deriving a scaling formula from a Maxwell equation set comprises the following steps:
if each physical quantity of the scaling model is in a form of ()', the scaling model should satisfy the following maxwell equations:
assuming that the similarity factor of the original model is k, the scaled model parameter is expressed as () ═ k( )() ', where () ' denotes the relevant physical quantities of the scaled model, the Maxwell's system of equations for the scaled model can be expressed as:
according to a similar theory, the similar relation of the equation set is obtained as follows:
taking the length, the current, the dielectric constant and the conductivity as basic scaling factors, obtaining the following scaling formula:
5. the +/-1100 kV extra-high voltage direct current composite insulator scaling test method according to claim 4, characterized in that when a scaling model is established, the dielectric constant epsilon of the scaling model is completely the same as that of an original model, the scaling model is modeled according to the same structural composition, and the size of the scaling model is set according to the selected similarity factor.
6. The method for testing the scaling of the +/-1100 kV extra-high voltage direct-current composite insulator according to claim 1, wherein in the step 3, based on the established scaling model, the voltage corresponding to the similarity factor is applied to the insulator, electric field and potential calculation is performed, electric field and potential distribution of the insulator are obtained, and the electric field and potential distribution are compared with an original model to verify the scaling coefficient.
7. The + -1100 kV extra-high voltage direct current composite insulator scaling test method according to claim 6, wherein in the step 4, when verifying the effectiveness of the scaling coefficient, the Pearson correlation coefficient of the electric field and the potential distribution of the original model and the scaling model is calculated.
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| CN104090190A (en) * | 2014-07-22 | 2014-10-08 | 武汉大学 | Design method of scale model of extra-high voltage converter transformer |
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| CN110749799A (en) * | 2019-12-02 | 2020-02-04 | 华北电力大学 | Extra-high voltage transformer direct current magnetic bias equivalent test method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105358802A (en) * | 2013-06-05 | 2016-02-24 | 弗拉奥·费兰蒂 | Charging system of an engine |
| CN104090190A (en) * | 2014-07-22 | 2014-10-08 | 武汉大学 | Design method of scale model of extra-high voltage converter transformer |
| CN110749799A (en) * | 2019-12-02 | 2020-02-04 | 华北电力大学 | Extra-high voltage transformer direct current magnetic bias equivalent test method and system |
Non-Patent Citations (2)
| Title |
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| 普子恒: "换流变压器绕组冲击电压下短路故障模拟与诊断方法", 《中国优秀博硕士学位论文全文数据库(博士)工程科技Ⅱ辑》 * |
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