CN113325239B - Method and system for calculating conductor corona onset field intensity based on composite electric field - Google Patents
Method and system for calculating conductor corona onset field intensity based on composite electric field Download PDFInfo
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Abstract
The application discloses a method and a system for calculating corona onset field intensity of a wire based on a composite electric field. Wherein the method comprises the following steps: measuring the intensity of the ground resultant electric field; calculating the nominal electric field intensity of the position of the ground composite electric field intensity measuring instrument under different voltages according to the structural parameters of the test wires and the type parameters of the erected wires; comparing the nominal electric field intensity under different voltages with the actually measured ground composite electric field intensity, and determining the corresponding voltage as the apparent corona onset voltage when the electric field intensity difference between the ground composite electric field intensity and the nominal electric field intensity is larger than a preset value; determining a specific voltage according to the apparent corona onset voltage, and measuring a specific resultant electric field intensity at a specific position on the ground at the specific voltage; measuring ion mobility in air; and determining the corona onset field intensity of the surface of the lead through iterative calculation according to the specific composite electric field intensity and the ion mobility at the specific position of the ground.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a method and a system for calculating the corona onset field intensity of a wire based on a composite electric field.
Background
The research of the corona onset field intensity of the high-voltage direct-current line wire has important significance for the prediction of the electromagnetic environment of the direct-current line, and particularly has a key effect on the prediction of the direct-current composite electric field, and the accuracy of the corona onset field intensity of the wire.
At present, peek formula is commonly used at home and abroad in the aspect of predicting the corona onset field intensity of a wire, and the formula is as followsWherein E is on The corona onset field intensity of the lead; m is a roughness coefficient reflecting the surface condition of the wire and is a positive number not more than 1; r is the radius of the wire; delta is the relative density of air. The formula is simple in form, and the corona onset field intensity on the surface of the wire can be calculated only by giving the radius of the wire, so that the method is widely applied to engineering.
However, the Peek formula is obtained through a test, a smooth cylindrical wire is adopted in the test, which is equivalent to the situation of m=1, and because the wire of the actual power transmission line generally adopts a stranded wire, the stranded wire can cause some flaws in the manufacturing and line erection processes, and grease, dirt, dust, water drops and the like on the surface of the wire can also roughen the surface of the wire, the corona-rising field intensity of the actual wire is often much lower than that of the smooth wire. Therefore, although researchers at home and abroad develop a great deal of test research on the actual corona onset field intensity of the transmission line wire, the corona onset field intensity of the conductor obtained by different research methods is different due to various adopted test methods and criteria, such as a visual inspection method, an ultraviolet photon counting method, a corona pulse method, a current-voltage curve fitting method and the like. Meanwhile, the above researches do not take the corona onset field intensity and the DC ground combined electric field as a unified whole for research, so that the obtained conductor corona onset field intensity has a larger difference from the corona onset field intensity used in the calculation of the DC ground combined electric field.
Aiming at the technical problems that the corona onset field intensity obtained through experiments in the prior art does not take the corona onset field intensity and the direct current ground combined electric field as a unified whole for research, the obtained conductor corona onset field intensity and the corona onset field intensity used in the calculation of the direct current ground combined electric field have larger gap, and no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the disclosure provides a method and a system for calculating the corona onset field intensity of a wire based on a composite electric field, which at least solve the technical problem that the corona onset field intensity obtained through experiments in the prior art does not take the corona onset field intensity and a direct current ground composite electric field as a unified whole for research, so that the obtained wire corona onset field intensity and the corona onset field intensity used in the calculation of the direct current ground composite electric field have larger difference.
According to one aspect of an embodiment of the present disclosure, there is provided a method of calculating a wire stunning field strength based on a composite electric field, comprising: measuring the ground composite electric field intensity E1; calculating the nominal electric field intensity E2 of the position of the ground composite electric field intensity measuring instrument under different voltages according to the structural parameters of the test wires and the type parameters of the erected wires; comparing the nominal electric field intensity E2 under different voltages with the actually measured ground composite electric field intensity E1, and determining the corresponding voltage as the apparent corona onset voltage U1 when the electric field intensity difference between the ground composite electric field intensity E1 and the nominal electric field intensity E2 is larger than a preset value; determining a specific voltage according to the apparent corona onset voltage U1, and measuring a specific resultant electric field intensity E3 at a specific ground position under the specific voltage; measuring ion mobility in air; and determining the corona onset field intensity of the surface of the lead according to the specific composite electric field intensity E3 at the specific position of the ground and the ion mobility.
According to another aspect of the disclosed embodiments, there is also provided a system for calculating wire stunning field strength based on a composite electric field, comprising: the ground composite electric field intensity measuring module is used for measuring the ground composite electric field intensity E1; the nominal electric field intensity calculating module is used for calculating the nominal electric field intensity E2 of the position of the ground composite electric field intensity measuring instrument under different voltages according to the structural parameters of the test wires and the type parameters of the erected wires; the visual corona onset voltage determining module is used for comparing the nominal electric field intensity E2 under different voltages with the actually measured ground synthesized electric field intensity E1, and determining the corresponding voltage as the visual corona onset voltage U1 when the electric field intensity difference between the ground synthesized electric field intensity E1 and the nominal electric field intensity E2 is larger than a preset value; a module for measuring the specific resultant electric field intensity, which is used for determining a specific voltage according to the apparent corona onset voltage U1 and measuring the specific resultant electric field intensity E3 at a specific ground position under the specific voltage; the ion mobility measuring module is used for measuring ion mobility in the air; and the corona onset field intensity determining module is used for determining the corona onset field intensity of the surface of the lead according to the specific composite electric field intensity E3 at the specific position of the ground and the ion mobility.
According to the application, the ground composite electric field measurement result of the direct current transmission line is obtained through theoretical iterative calculation, and the method has the advantages of simplicity, easiness and high accuracy. According to the ground composite electric field test result under the direct current transmission line, the surface corona onset field intensity of the lead of the direct current transmission line is determined by combining theoretical calculation, and the lead corona onset field intensity determined according to the method has higher accuracy in the aspect of predicting the direct current composite electric field. Provides a basis for accurately predicting the ground composite electric field of the DC transmission line in China, and can ensure that the ground composite electric field level of the transmission line can better meet the environmental protection requirement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the present disclosure, and together with the description serve to explain the present disclosure. In the drawings:
FIG. 1 is a flow diagram of a method for calculating wire stunning field strength based on a composite electric field according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an arrangement of a DC test wire and a resultant electric field strength measurement instrument according to an embodiment of the present disclosure;
FIG. 3 is a plot of nominal and resultant electric field strength as a function of voltage according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a comparison of calculated ground resultant electric field distribution curves with actual measurements in accordance with an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a system for calculating wire stunning field strength based on a composite electric field according to an embodiment of the present disclosure.
Detailed Description
The exemplary embodiments of the present application will now be described with reference to the accompanying drawings, however, the present application may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present application and fully convey the scope of the application to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the application. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
According to a first aspect of the present application, a method 100 of calculating wire stunning field strength based on a composite electric field is provided. Referring to fig. 1, the method includes:
s102, measuring the ground composite electric field intensity E1;
s104, calculating the nominal electric field intensity E2 of the position of the ground composite electric field intensity measuring instrument under different voltages according to the structural parameters of the test wires and the type parameters of the erected wires;
s106, comparing the nominal electric field intensity E2 under different voltages with the actually measured ground synthesized electric field intensity E1, and determining the corresponding voltage as apparent corona onset voltage U1 when the electric field intensity difference between the ground synthesized electric field intensity E1 and the nominal electric field intensity E2 is larger than a preset value;
s108, determining a specific voltage according to the apparent corona onset voltage U1, and measuring a specific resultant electric field intensity E3 at a specific ground position under the specific voltage;
s110, measuring ion mobility in air;
s112, determining the corona onset field intensity of the surface of the wire according to the specific composite electric field intensity E3 at the specific position of the ground and the ion mobility.
Specifically, the method for calculating the corona onset field strength of the lead based on the composite electric field comprises the following steps:
(1) A test wire is erected on a test wire segment, direct current voltage is applied to the wire from 0, a composite electric field intensity measuring instrument is arranged at a specific position on the ground below the wire in the direction perpendicular to the wire at the central position along the length direction of the wire, and the composite electric field intensity E1 at the ground is measured.
(2) And calculating the nominal electric field intensity E2 of the position of the ground composite electric field intensity measuring instrument under different voltages according to the structural parameters of the test line segments and the type parameters of the erected wires.
(3) And comparing the nominal electric field intensity E2 under different voltages with the actually measured ground composite electric field intensity E1, and recording the corresponding voltage as the apparent corona onset voltage U1 when the E1-E2 is larger than a certain specified value.
(4) And selecting a proper voltage in a range above the apparent corona onset voltage U1, and measuring the resultant electric field intensity E3 at a specific position on the ground under the voltage.
(5) Ion mobility in air was measured.
(6) And determining the corona onset field intensity of the surface of the lead through iterative calculation by using the ground composite electric field intensity measurement result at the specific position.
The test wire can be erected in a single-pole manner, a Shan Huishui flat manner and a single-loop vertical manner. The principle of the composite electric field strength measuring instrument can be field grinding type, polar plate vibration type and Micro Electro Mechanical System (MEMS). And a specific position below the line on the ground is recommended to select any position within the range of 3-6m outside the projection of the positive electrode lead or the negative electrode lead to the ground. The calculation method of the nominal electric field intensity can adopt an analog charge method, a successive mirror image method, a finite element method and the like. And selecting a proper test voltage in a range above the apparent corona onset voltage U1, wherein the selection range of the test voltage is suggested to be between 1.1U1 and 1.4U1. The ion mobility measurement method may be a voltage-current curve method, a pulse method, or a migration tube method.
The corona onset field intensity of the surface of the lead is determined through iterative calculation, and the specific calculation steps are as follows:
1) Setting an initial value of corona onset field intensity on the surface of a wire;
2) According to the actually measured ion mobility, calculating the synthesized electric field intensity E4 at a specific ground position by using the existing mature direct current ground synthesized electric field intensity calculation method;
3) The ground composite electric field strength measurement E3 is compared with the calculated value E4. If the relative error is larger than the specified value delta, changing the initial value of the corona onset field intensity; and stopping calculation when the relative error is smaller than the specified value delta. The current corona onset field intensity value is the actual corona onset field intensity value of the lead.
The calculation method of the direct current ground synthesized electric field intensity can adopt a flux line method, a finite element method and the like. The value of the specified value delta is recommended to be within 5 percent.
The detailed implementation of the present application will be described by taking the test results on the Tibet high altitude test line segment at an altitude of 1700m as an example.
Referring to fig. 2, the test line parameters are: shan Huishui, the height of the wires to the ground is 7m, and the wires are 6X 95mm 2 The altitude is 1700m. And arranging a composite electric field measuring instrument at a certain distance outside the projection of the positive electrode and the negative electrode of the test line segment to the ground.
And (3) applying bipolar direct current voltage from 0 to 300kV on a test line segment, measuring the ground resultant electric field intensity at the position 2m outside the projection of the negative electrode lead to the ground under different voltages, and simultaneously calculating the nominal electric field intensity at the position according to an analog charge method to obtain a curve of the ground resultant electric field intensity and the nominal electric field intensity along with the voltage change, wherein the curve is shown in figure 3. By comparing the difference between the nominal electric field strength and the resultant electric field strength, the two curves begin to have a significant difference (the difference between the resultant electric field strength and the nominal electric field strength is greater than 1 kV/cm) at 160kV, which is the apparent corona onset voltage.
According to the apparent corona onset voltage of 1.1-1.4 times, the test voltage is selected, the test voltage range is 176 kV-224 kV, the 200kV voltage is selected as the test voltage, and the statistical average value of the ground synthetic electric field intensity at the position 2m outside the projection of the negative electrode lead to the ground is 13.8kV/cm.
Setting the initial value of the corona onset field intensity of the surface of the wire to be 14kV/cm, continuously changing the corona onset field intensity of the surface of the wire, and calculating the ground synthesized electric field at the position 2m outside the ground projection of the negative electrode wires corresponding to the corona onset field intensity of different surfaces of the wire by using a DC ground synthesized electric field calculation method based on a flux line method. Comparing the actual measured value of the ground composite electric field strength with a calculated value, and if the calculated value is larger than the measured value, increasing the initial value of the corona onset field intensity on the surface of the lead; if the calculated value is smaller than the measured value, the initial value of the corona onset field intensity of the surface of the wire is reduced. When the calculated value is smaller than the measured value and the relative error is smaller than 5%, the surface field intensity of the wire at the moment can be considered to be the actual surface corona onset field intensity of the wire. Calculated to be 6X 95mm 2 The corona onset field strength of the wire at an altitude of 1700m is about 15.8kV/cm. The ground composite electric field distribution curve is calculated based on the corona onset field strength, and the comparison with the actual measurement result is shown in fig. 4.
Therefore, the method is obtained through theoretical iterative calculation according to the ground composite electric field measurement result of the direct current transmission line, and has the advantages of simplicity, easiness and high accuracy. According to the ground composite electric field test result under the direct current transmission line, the surface corona onset field intensity of the lead of the direct current transmission line is determined by combining theoretical calculation, and the lead corona onset field intensity determined according to the method has higher accuracy in the aspect of predicting the direct current composite electric field. Provides a basis for accurately predicting the ground composite electric field of the DC transmission line in China, and can ensure that the ground composite electric field level of the transmission line can better meet the environmental protection requirement.
Optionally, determining the wire surface corona onset field strength according to the specific resultant electric field strength E3 at the specific position of the ground and the ion mobility comprises: determining the initial value of the corona onset field intensity on the surface of the lead; according to the ion mobility, calculating the synthetic electric field intensity E4 at a specific ground position; comparing the specific synthesized electric field intensity E3 with the synthesized electric field intensity E4 to determine a relative error; if the relative error is greater than a preset error value delta, changing the initial value of the corona onset field intensity; when the relative error is smaller than the prescribed value delta, the current stunning field intensity value is determined as the true stunning field intensity value of the lead.
Optionally, calculating the resultant electric field intensity E4 at the specific position of the ground based on the ion mobility includes: and according to the ion mobility, calculating the synthetic electric field intensity E4 at the specific position of the ground by adopting an analog charge method, a successive mirror image method or a finite element method.
Optionally, the method further comprises: and (5) erecting the lead on the test line section in a single-pole erection mode, a Shan Huishui horizontal erection mode or a single-loop vertical erection mode.
Optionally, measuring ion mobility in air includes: ion mobility in air is measured by a voltage-current curve method, a pulse method, or a migration tube method.
Therefore, the method is obtained through theoretical iterative calculation according to the ground composite electric field measurement result of the direct current transmission line, and has the advantages of simplicity, easiness and high accuracy. According to the ground composite electric field test result under the direct current transmission line, the surface corona onset field intensity of the lead of the direct current transmission line is determined by combining theoretical calculation, and the lead corona onset field intensity determined according to the method has higher accuracy in the aspect of predicting the direct current composite electric field. Provides a basis for accurately predicting the ground composite electric field of the DC transmission line in China, and can ensure that the ground composite electric field level of the transmission line can better meet the environmental protection requirement.
In accordance with another aspect of the present application, a system 500 for calculating wire stunning field strength based on a composite electric field is also provided. Referring to fig. 5, the system 500 includes: a ground resultant electric field intensity measurement module 510 for measuring a ground resultant electric field intensity E1; the nominal electric field intensity calculating module 520 is configured to calculate nominal electric field intensity E2 of the position of the ground composite electric field intensity measuring instrument under different voltages according to the structural parameters of the test wire and the type parameters of the erected wire; the apparent corona onset voltage determining module 530 is configured to compare the nominal electric field intensity E2 at different voltages with the actually measured ground resultant electric field intensity E1, and determine the corresponding voltage as the apparent corona onset voltage U1 when the electric field intensity difference between the ground resultant electric field intensity E1 and the nominal electric field intensity E2 is greater than a predetermined value; a specific resultant electric field intensity measurement module 540 for determining a specific voltage from the apparent corona onset voltage U1, and measuring a specific resultant electric field intensity E3 at a specific position on the ground at the specific voltage; a measure ion mobility module 550 for measuring ion mobility in air; a determining corona onset field strength module 560 for determining a conductor surface corona onset field strength based on a specific resultant electric field strength E3 at a specific location on the ground and the ion mobility.
Optionally, determining the stun field strength module 560 includes: the sub-module is used for determining the initial value of the corona onset field intensity of the surface of the lead; the sub-module for calculating the intensity of the synthesized electric field is used for calculating the intensity E4 of the synthesized electric field at the specific position of the ground according to the mobility of the ions; a relative error determination sub-module for comparing the specific resultant electric field intensity E3 with the resultant electric field intensity E4 to determine a relative error; the initial value change corona onset field intensity sub-module is used for changing the initial value of the corona onset field intensity if the relative error is larger than a preset error value delta; and the real corona onset field intensity value determining submodule is used for determining the current corona onset field intensity value as the real corona onset field intensity value of the lead when the relative error is smaller than a specified value delta.
Optionally, the calculating the composite electric field strength sub-module includes: and calculating the synthesized electric field intensity E4 at a specific ground position by adopting an analog charge method, a successive mirror image method or a finite element method according to the ion mobility.
Optionally, the method further comprises: and the lead erection module is used for erecting leads on the test line section in a single-pole erection mode, a Shan Huishui horizontal erection mode or a single-loop vertical erection mode.
Optionally, the measure ion mobility module 550 includes: the ion mobility measuring submodule is used for measuring the ion mobility in the air through a voltage-current curve method, a pulse method or a migration tube method.
A system 500 for calculating a wire stunning field strength based on a composite electric field according to an embodiment of the present application corresponds to a method 100 for calculating a wire stunning field strength based on a composite electric field according to another embodiment of the present application, and is not described herein.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A method for calculating a wire stunning field strength based on a composite electric field, comprising:
measuring the ground composite electric field intensity E1;
calculating the nominal electric field intensity E2 under different voltages according to the structural parameters of the test wires and the type parameters of the erected wires;
comparing the nominal electric field intensity E2 under different voltages with the actually measured ground composite electric field intensity E1, and determining the corresponding voltage as the apparent corona onset voltage U1 when the electric field intensity difference between the ground composite electric field intensity E1 and the nominal electric field intensity E2 is larger than a preset value;
determining a specific voltage according to the apparent corona onset voltage U1, and measuring a specific resultant electric field intensity E3 at a specific ground position under the specific voltage, wherein a proper voltage is selected in a range above the apparent corona onset voltage U1, the resultant electric field intensity E3 at the specific ground position under the voltage is measured, and the specific voltage is selected in a range above the apparent corona onset voltage U1, namely, a proper test voltage is selected, and the selection range of the test voltage is suggested to be between 1.1U1 and 1.4U1;
measuring ion mobility in air;
determining the corona onset field intensity of the surface of the lead according to the specific composite electric field intensity E3 at the specific position of the ground and the ion mobility;
determining a surface corona onset field strength per wire based on a specific resultant electric field strength E3 at a specific location on the ground and the ion mobility, comprising:
determining the initial value of the corona onset field intensity on the surface of the lead;
according to the ion mobility, calculating the synthetic electric field intensity E4 at a specific ground position;
comparing the specific synthesized electric field intensity E3 with the synthesized electric field intensity E4 to determine a relative error;
if the relative error is greater than a preset error value delta, changing the initial value of the corona onset field intensity;
when the relative error is smaller than the prescribed value delta, the current stunning field intensity value is determined as the true stunning field intensity value of the lead.
2. The method of claim 1, wherein calculating the resultant electric field strength E4 at the specific location of the ground based on the ion mobility comprises:
and according to the ion mobility, calculating the synthetic electric field intensity E4 at the specific position of the ground by adopting an analog charge method, a successive mirror image method or a finite element method.
3. The method as recited in claim 1, further comprising:
and (5) erecting the lead on the test line section in a single-pole erection mode, a Shan Huishui horizontal erection mode or a single-loop vertical erection mode.
4. The method of claim 1, wherein measuring ion mobility in air comprises:
ion mobility in air is measured by a voltage-current curve method, a pulse method, or a migration tube method.
5. A system for calculating a wire stunning field strength based on a composite electric field, comprising:
the ground composite electric field intensity measuring module is used for measuring the ground composite electric field intensity E1;
the nominal electric field intensity calculating module is used for calculating the nominal electric field intensity E2 of the position of the ground composite electric field intensity measuring instrument under different voltages according to the structural parameters of the test wires and the type parameters of the erected wires;
the visual corona onset voltage determining module is used for comparing the nominal electric field intensity E2 under different voltages with the actually measured ground synthesized electric field intensity E1, and determining the corresponding voltage as the visual corona onset voltage U1 when the electric field intensity difference between the ground synthesized electric field intensity E1 and the nominal electric field intensity E2 is larger than a preset value;
a module for measuring the specific resultant electric field intensity, which is used for determining the specific voltage according to the apparent corona onset voltage U1, measuring the specific resultant electric field intensity E3 at the specific ground position under the specific voltage, wherein the specific voltage is selected in a range above the apparent corona onset voltage U1, measuring the resultant electric field intensity E3 at the specific ground position under the voltage, namely, the specific voltage is selected in a range above the apparent corona onset voltage U1, and the selection range of the test voltage is suggested to be between 1.1U1 and 1.4U1;
the ion mobility measuring module is used for measuring ion mobility in the air;
the corona onset field intensity determining module is used for determining the corona onset field intensity of the surface of the lead according to the specific composite electric field intensity E3 at the specific position of the ground and the ion mobility;
a module for determining a stunning field strength, comprising:
the sub-module is used for determining the initial value of the corona onset field intensity of the surface of the lead;
the sub-module for calculating the intensity of the synthesized electric field is used for calculating the intensity E4 of the synthesized electric field at the specific position of the ground according to the mobility of the ions;
a relative error determination sub-module for comparing the specific resultant electric field intensity E3 with the resultant electric field intensity E4 to determine a relative error;
the initial value change corona onset field intensity sub-module is used for changing the initial value of the corona onset field intensity if the relative error is larger than a preset error value delta;
and the real corona onset field intensity value determining submodule is used for determining the current corona onset field intensity value as the real corona onset field intensity value of the lead when the relative error is smaller than a specified value delta.
6. The system of claim 5, wherein the calculate composite electric field strength sub-module comprises:
and calculating the synthesized electric field intensity E4 at a specific ground position by adopting an analog charge method, a successive mirror image method or a finite element method according to the ion mobility.
7. The system of claim 5, further comprising:
and the lead erection module is used for erecting leads on the test line section in a single-pole erection mode, a Shan Huishui horizontal erection mode or a single-loop vertical erection mode.
8. The system of claim 5, wherein measuring the ion mobility module comprises:
the ion mobility measuring submodule is used for measuring the ion mobility in the air through a voltage-current curve method, a pulse method or a migration tube method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110494383.2A CN113325239B (en) | 2021-05-07 | 2021-05-07 | Method and system for calculating conductor corona onset field intensity based on composite electric field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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