CN113325239A - Method and system for calculating corona starting field intensity of wire based on synthetic electric field - Google Patents
Method and system for calculating corona starting field intensity of wire based on synthetic electric field Download PDFInfo
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Abstract
The application discloses a method and a system for calculating the field intensity of wire corona starting field based on a synthetic electric field. Wherein, the method comprises the following steps: measuring the intensity of the ground synthetic electric field; calculating the nominal electric field intensity of the position of the ground synthetic electric field intensity measuring instrument under different voltages according to the structural parameters of the test lead and the type parameters of the erected lead; comparing the nominal electric field intensity under different voltages with the ground synthetic electric field intensity obtained by actual measurement, and determining the corresponding voltage as the apparent corona onset voltage when the electric field intensity difference value of the ground synthetic electric field intensity and the nominal electric field intensity is greater than a preset value; determining a specific voltage according to the apparent corona starting voltage, and measuring the specific synthetic electric field intensity at a specific position on the ground under the specific voltage; measuring the ion mobility in air; and determining the corona starting field intensity of the surface of the wire by iterative calculation according to the specific composite electric field intensity and the ion mobility at the specific position on 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 starting field intensity of a wire based on a synthetic electric field.
Background
The research on the field intensity of the corona onset field of the high-voltage direct-current line wire has important significance for predicting the electromagnetic environment of the direct-current line, and particularly has a key effect on the accuracy of the field intensity of the corona onset field of the wire for predicting a direct-current synthetic electric field.
At present, the Peek formula is commonly used at home and abroad in the aspect of predicting the corona-initiating field intensity of a wire, and the formula form is as follows
In the formula, EonIs the corona onset field strength of the wire; m is a roughness coefficient reflecting the surface condition of the wire, and is a positive number not greater than 1; r is the wire radius; δ is the relative density of air. The formula is simple in form, and the corona 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 expression of the Peek formula is obtained through a test, a smooth cylindrical wire is adopted in the test, which is equivalent to the case that m is 1, because a twisted wire is generally adopted as a wire of an actual power transmission line, the twisted wire may cause some scratches in the manufacturing and line erecting processes, and in addition, grease, dirt, dust, water drops and the like on the surface of the wire also cause the surface of the wire to be rough, so the actual corona field intensity of the wire is often much lower than that of the smooth wire. Therefore, although researchers at home and abroad carry out a great deal of experimental research on the actual corona field intensity of the transmission line conductor, the corona field intensity of the conductor obtained by different research methods is different due to various adopted test methods and criteria, such as a visual method, an ultraviolet photon counting method, a corona pulse method, a current-voltage curve fitting method and the like. Meanwhile, the research does not take the corona onset field intensity and the direct-current ground synthetic electric field as a unified whole to carry out research, so that the difference between the obtained wire corona onset field intensity and the corona onset field intensity used in the calculation of the direct-current ground synthetic electric field is large.
Aiming at the technical problem that the research on the corona starting field intensity obtained through the test in the prior art does not take the corona starting field intensity and the direct-current ground synthetic electric field as a unified whole, so that the difference between the obtained conducting wire corona starting field intensity and the corona starting field intensity used in the calculation of the direct-current ground synthetic electric field is large, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the disclosure provides a method and a system for calculating a wire corona starting field intensity based on a synthetic electric field, which at least solve the technical problem that the corona starting field intensity obtained through tests in the prior art does not take the corona starting field intensity and a direct-current ground synthetic electric field as a unified whole to carry out research, so that the difference between the obtained wire corona starting field intensity and the corona starting field intensity used in the calculation of the direct-current ground synthetic electric field is large.
According to an aspect of the embodiments of the present disclosure, there is provided a method for calculating a wire corona field strength based on a composite electric field, including: measuring the ground resultant electric field intensity E1; calculating the nominal electric field intensity E2 of the position of the ground synthetic electric field intensity measuring instrument under different voltages according to the structural parameters of the test lead and the type parameters of the erected lead; comparing the nominal electric field intensity E2 at different voltages with the actually measured ground combined electric field intensity E1, and determining the corresponding voltage as an apparent corona starting voltage U1 when the electric field intensity difference between the ground combined electric field intensity E1 and the nominal electric field intensity E2 is larger than a preset value; determining a specific voltage from the apparent corona onset voltage U1, measuring a specific resultant electric field strength E3 at a specific location on ground at the specific voltage; measuring the ion mobility in air; determining the corona starting field strength of the surface of the wire according to the specific resultant electric field strength E3 at the specific position on the ground and the ion mobility.
According to another aspect of the embodiments of the present disclosure, there is also provided a system for calculating a wire corona starting field strength based on a combined electric field, including: the module for measuring the terrestrial combined electric field intensity is used for measuring the terrestrial combined 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 synthetic electric field intensity measuring instrument under different voltages according to the structural parameters of the tested lead and the type parameters of the erected lead; an apparent corona onset voltage determining module, configured to compare a nominal electric field strength E2 at different voltages with an actually measured ground combined electric field strength E1, and determine a corresponding voltage as an apparent corona onset voltage U1 when an electric field strength difference between the ground combined electric field strength E1 and the nominal electric field strength E2 is greater than a predetermined value; a module for measuring specific synthesized electric field intensity, which is used for determining specific voltage according to the apparent corona starting voltage U1, and measuring specific synthesized electric field intensity E3 at a specific position on the ground under the specific voltage; the ion mobility measuring module is used for measuring the ion mobility in the air; and the module for determining the field intensity of the corona starting field is used for determining the field intensity of the corona starting field on the surface of the wire according to the specific composite electric field intensity E3 at the specific position on the ground and the ion mobility.
In the invention, the measurement result of the ground synthesized electric field of the direct current transmission line is obtained through theoretical iterative calculation, and the method has the advantages of simplicity, convenience, practicability and high accuracy. According to the test result of the ground synthetic electric field under the direct current transmission line, the wire surface corona field intensity of the direct current transmission line is determined by combining theoretical calculation, and the wire corona field intensity determined by the method has higher accuracy in predicting the direct current synthetic electric field. The method provides a basis for accurate prediction of the ground synthetic electric field of the direct current transmission line in China, and can ensure that the level of the ground synthetic electric field of the transmission line can better meet the requirement of environmental protection.
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The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
FIG. 1 is a schematic flow chart of a method for calculating a wire corona starting 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 lead and a resultant electric field strength meter according to an embodiment of the disclosure;
FIG. 3 is a plot of nominal and composite electric field strength versus voltage according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a comparison of a calculated surface resultant electric field distribution curve and actual measurements according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a system for calculating a wire corona onset field strength based on a composite electric field according to an embodiment of the disclosure.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention 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 invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those 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 a wire corona onset field strength based on a composite electric field is provided. Referring to fig. 1, the method includes:
s102, measuring the ground combined electric field intensity E1;
s104, calculating the nominal electric field intensity E2 of the position of the ground synthetic electric field intensity measuring instrument under different voltages according to the structural parameters of the test lead and the type parameters of the erected lead;
s106, comparing the nominal electric field intensity E2 under different voltages with the actually measured ground combined electric field intensity E1, and determining the corresponding voltage as an apparent corona starting voltage U1 when the electric field intensity difference between the ground combined 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 starting voltage U1, and measuring a specific resultant electric field intensity E3 at a specific position on the ground under the specific voltage;
s110, measuring the ion mobility in the air;
and S112, determining the corona starting field intensity of the surface of the wire according to the specific composite electric field intensity E3 at the specific position on the ground and the ion mobility.
Specifically, the method for calculating the corona starting field intensity of the wire based on the synthetic electric field comprises the following steps:
(1) a test wire is erected on the test line section, a direct current voltage is applied to the wire from 0, a combined electric field intensity measuring instrument is arranged at a specific position of the ground below the circuit along the direction vertical to the wire at the central position along the length direction of the wire, and the combined electric field intensity E1 at the ground is measured.
(2) And calculating the nominal electric field intensity E2 of the position of the ground combined electric field intensity measuring instrument under different voltages according to the structural parameters of the test line segment and the type parameters of the erected conductor.
(3) Comparing the nominal electric field intensity E2 at different voltages with the actually measured ground combined electric field intensity E1, when E1-E2 are greater than a specified value, the corresponding voltage is recorded as the apparent corona starting voltage U1.
(4) An appropriate voltage is selected in a range above the apparent corona onset voltage U1, and the resultant electric field strength E3 at a specific location on ground at that voltage is measured.
(5) The ion mobility in air was measured.
(6) And determining the surface corona starting field intensity of the wire by iterative calculation by utilizing the ground synthesized electric field intensity measurement result at the specific position.
The test lead can be erected in a single-pole erection mode, a single-circuit horizontal erection mode and a single-circuit vertical erection mode. The principle of the synthetic electric field intensity measuring instrument can be a field grinding type, a polar plate vibration type and a Micro Electro Mechanical System (MEMS). And selecting any position within a range of 3-6m outside the ground projection of the positive lead or the negative lead at the specific position of the ground below the line. The nominal electric field strength can be calculated by an analog charge method, a successive mirror image method, a finite element method, or the like. The proper test voltage is selected within the range above the apparent corona starting voltage U1, and the selection range of the test voltage is recommended to be between 1.1U1 and 1.4U 1. The ion mobility measurement method may be a voltage-current curve method, a pulse method, and a mobility tube method.
The method comprises the following specific steps of determining the surface corona field intensity of the wire through iterative calculation:
1) setting an initial value of the field intensity of the corona starting on the surface of a wire;
2) according to the ion mobility obtained by actual measurement, calculating the synthetic electric field intensity E4 at the specific position on the ground by using the existing mature direct-current ground synthetic electric field intensity calculation method;
3) the terrestrial combined electric field strength measurement E3 is compared to the calculated value E4. If the relative error is larger than a specified value delta, changing an initial value of the field intensity of the starting corona; when the relative error is smaller than a prescribed value delta, the calculation is stopped. The current field intensity value of the corona starting is the real field intensity value of the corona starting of the wire.
The method for calculating the direct current ground synthetic 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 invention is illustrated 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 trial segment parameters are: the single circuit is horizontally arranged, the height of the lead to the ground is 7m, and the lead is 6 multiplied by 95mm2And the altitude is 1700 m. And arranging a composite electric field measuring instrument at certain intervals at the outer sides of the projections of the anode and cathode leads of the test line segment to the ground.
Applying bipolar direct-current voltage from 0 to the test line segment, wherein the voltage range is 0-300 kV, measuring the ground combined electric field intensity at the position 2m outside the ground projection of the negative electrode lead under different voltages, and calculating the nominal electric field intensity at the position according to an analog charge method to obtain the curves of the ground combined electric field intensity and the nominal electric field intensity along with the voltage change, as shown in FIG. 3. By comparing the difference between the nominal electric field strength and the synthesized electric field strength, the two curves begin to have obvious difference under the voltage of 160kV (the difference between the synthesized electric field strength and the nominal electric field strength is more than 1kV/cm), and 160kV is the apparent corona onset voltage.
Selecting a test voltage according to the apparent corona onset voltage of 1.1-1.4 times, wherein the test voltage range is 176 kV-224 kV, and selecting 200kV as the test voltage to obtain the statistical average value of the ground synthetic electric field intensity of 2m outside the ground projection of the negative electrode conductor of the test voltage, wherein the statistical average value is 13.8 kV/cm.
Setting the initial value of the corona field intensity on the surface of the lead to be 14kV/cm, continuously changing the corona field intensity on the surface of the lead, and calculating the ground synthetic electric field at the 2m position outside the ground projection of the negative lead corresponding to the corona field intensity on the surface of the lead by using a direct current ground synthetic electric field calculation method based on a flux line method. Comparing the actual measured value with the calculated value of the ground synthetic electric field intensity, and increasing the initial value of the corona field intensity on the surface of the wire if the calculated value is greater than the measured value; and if the calculated value is smaller than the measured value, reducing the initial value of the corona field intensity on the surface of the wire. When the calculated value is less than 5% of the relative error of the measured value, the surface field intensity of the wire at the moment can be considered as the real wire surface corona field intensity. Calculated to obtain 6 multiplied by 95mm2The corona onset field strength of the wire at an altitude of 1700m is about 15.8 kV/cm. Calculating to obtain ground synthetic electric field component based on the corona-starting field intensityThe graph, compared to the actual measurement results, is shown in fig. 4.
Therefore, the measurement result of the ground synthesized electric field of the direct current transmission line is obtained through theoretical iterative calculation, and the method has the advantages of simplicity, convenience, practicability and high accuracy. According to the test result of the ground synthetic electric field under the direct current transmission line, the wire surface corona field intensity of the direct current transmission line is determined by combining theoretical calculation, and the wire corona field intensity determined by the method has higher accuracy in predicting the direct current synthetic electric field. The method provides a basis for accurate prediction of the ground synthetic electric field of the direct current transmission line in China, and can ensure that the level of the ground synthetic electric field of the transmission line can better meet the requirement of environmental protection.
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, comprising: determining initial values of field intensity of corona starting on the surface of the wire; calculating the composite electric field intensity E4 at a specific position on the ground according to the ion mobility; comparing the specific synthesized electric field strength E3 with the synthesized electric field strength E4 to determine a relative error; if the relative error is larger than a preset error value delta, changing an initial value of the initial corona field intensity; and when the relative error is smaller than a specified value delta, determining the current corona-starting field intensity value as the real corona-starting field intensity value of the wire.
Optionally, calculating a resultant electric field strength E4 at the ground specific location according to the ion mobility, including: and calculating the synthetic electric field intensity E4 at the specific position on the ground by adopting an analog charge method, a successive image method or a finite element method according to the ion mobility.
Optionally, the method further comprises: and erecting the lead on the test line section by adopting a single-pole erection mode, a single-circuit horizontal erection mode or a single-circuit vertical erection mode.
Optionally, measuring ion mobility in air comprises: the ion mobility in air is measured by a voltage-current curve method, a pulse method, or a migration tube method.
Therefore, the measurement result of the ground synthesized electric field of the direct current transmission line is obtained through theoretical iterative calculation, and the method has the advantages of simplicity, convenience, practicability and high accuracy. According to the test result of the ground synthetic electric field under the direct current transmission line, the wire surface corona field intensity of the direct current transmission line is determined by combining theoretical calculation, and the wire corona field intensity determined by the method has higher accuracy in predicting the direct current synthetic electric field. The method provides a basis for accurate prediction of the ground synthetic electric field of the direct current transmission line in China, and can ensure that the level of the ground synthetic electric field of the transmission line can better meet the requirement of environmental protection.
According to another aspect of the present application, there is also provided a system 500 for calculating a wire corona onset field strength based on a composite electric field. Referring to fig. 5, the system 500 includes: a module 510 for measuring a terrestrial combined electric field intensity, E1; a nominal electric field strength calculating module 520, configured to calculate a nominal electric field strength E2 at a location where the ground synthetic electric field strength measuring instrument is located under different voltages according to the structural parameters of the test conductor and the type parameters of the erected conductor; an apparent corona onset voltage determining module 530, configured to compare the nominal electric field strength E2 at different voltages with an actually measured terrestrial combined electric field strength E1, and determine a corresponding voltage as an apparent corona onset voltage U1 when an electric field strength difference between the terrestrial combined electric field strength E1 and the nominal electric field strength E2 is greater than a predetermined value; a measure specific resultant electric field strength module 540 for determining a specific voltage from the apparent starting voltage U1, measuring a specific resultant electric field strength E3 at a specific location on the ground at the specific voltage; a measure ion mobility module 550 for measuring ion mobility in air; and a determining corona onset field strength module 560 for determining the wire surface corona onset field strength according to the specific resultant electric field strength E3 at the specific location on the ground and the ion mobility.
Optionally, the module 560 for determining a corona onset field strength includes: the initial value submodule for determining the initial value of the field intensity of the corona starting on the surface of the lead is used for determining the initial value of the field intensity of the corona starting on the surface of the lead; a module for calculating the synthetic electric field intensity, which is used for calculating the synthetic electric field intensity E4 at the specific position on the ground according to the ion mobility; a determine relative error sub-module for comparing the particular combined electric field strength E3 with the combined electric field strength E4 to determine a relative error; the module for changing the initial value of the field intensity of the starting corona is used for changing the initial value of the field intensity of the starting corona if the relative error is larger than a preset error value delta; and the submodule for determining the actual corona onset field intensity value is used for determining the current corona onset field intensity value as the actual corona onset field intensity value of the wire when the relative error is smaller than a specified value delta.
Optionally, the calculating the composite electric field strength submodule includes: and a unit for calculating the synthetic electric field intensity, wherein the synthetic electric field intensity E4 at the specific position on the ground is calculated by adopting an analog charge method, a successive image method or a finite element method according to the ion mobility.
Optionally, the method further comprises: and the erecting wire module is used for erecting wires on the test line section in a single-pole erecting mode, a single-circuit horizontal erecting mode or a single-circuit vertical erecting mode.
Optionally, the measure ion mobility module 550 comprises: and the sub-module for measuring the ion mobility in the air by a voltage-current curve method, a pulse method or a migration tube method.
The system 500 for calculating the wire corona onset field strength based on the synthetic electric field according to the embodiment of the present invention corresponds to the method 100 for calculating the wire corona onset field strength based on the synthetic electric field according to another embodiment of the present invention, and is not described herein again.
As will be appreciated by one skilled in the art, 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 implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 the 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. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method for calculating the field intensity of wire corona starting field based on a synthetic electric field is characterized by comprising the following steps:
measuring the ground resultant electric field intensity E1;
calculating the nominal electric field intensity E2 under different voltages according to the structural parameters of the test lead and the type parameters of the erected lead;
comparing the nominal electric field intensity E2 at different voltages with the actually measured ground combined electric field intensity E1, and determining the corresponding voltage as an apparent corona starting voltage U1 when the electric field intensity difference between the ground combined electric field intensity E1 and the nominal electric field intensity E2 is larger than a preset value;
determining a specific voltage from the apparent corona onset voltage U1, measuring a specific resultant electric field strength E3 at a specific location on ground at the specific voltage;
measuring the ion mobility in air;
determining the corona starting field strength of the surface of the wire according to the specific resultant electric field strength E3 at the specific position on the ground and the ion mobility.
2. The method of claim 1, wherein determining a corona onset field strength per wire surface based on a specific resultant electric field strength E3 at a specific location in the ground and the ion mobility comprises:
determining initial values of field intensity of corona starting on the surface of the wire;
calculating the composite electric field intensity E4 at a specific position on the ground according to the ion mobility;
comparing the specific synthesized electric field strength E3 with the synthesized electric field strength E4 to determine a relative error;
if the relative error is larger than a preset error value delta, changing an initial value of the initial corona field intensity;
and when the relative error is smaller than a specified value delta, determining the current corona-starting field intensity value as the real corona-starting field intensity value of the wire.
3. The method of claim 1, wherein calculating a composite electric field strength E4 at a ground-specific location based on the ion mobility comprises:
and calculating the synthetic electric field intensity E4 at the specific position on the ground by adopting an analog charge method, a successive image method or a finite element method according to the ion mobility.
4. The method of claim 1, further comprising:
and erecting the lead on the test line section by adopting a single-pole erection mode, a single-circuit horizontal erection mode or a single-circuit vertical erection mode.
5. The method of claim 1, wherein measuring the mobility of ions in air comprises:
the ion mobility in air is measured by a voltage-current curve method, a pulse method, or a migration tube method.
6. A system for calculating a wire corona onset field strength based on a composite electric field, comprising:
the module for measuring the terrestrial combined electric field intensity is used for measuring the terrestrial combined 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 synthetic electric field intensity measuring instrument under different voltages according to the structural parameters of the tested lead and the type parameters of the erected lead;
an apparent corona onset voltage determining module, configured to compare a nominal electric field strength E2 at different voltages with an actually measured ground combined electric field strength E1, and determine a corresponding voltage as an apparent corona onset voltage U1 when an electric field strength difference between the ground combined electric field strength E1 and the nominal electric field strength E2 is greater than a predetermined value;
a module for measuring specific synthesized electric field intensity, which is used for determining specific voltage according to the apparent corona starting voltage U1, and measuring specific synthesized electric field intensity E3 at a specific position on the ground under the specific voltage;
the ion mobility measuring module is used for measuring the ion mobility in the air;
and the module for determining the field intensity of the corona starting field is used for determining the field intensity of the corona starting field on the surface of the wire according to the specific composite electric field intensity E3 at the specific position on the ground and the ion mobility.
7. The system of claim 6, wherein the determining a corona onset field strength module comprises:
the initial value submodule for determining the initial value of the field intensity of the corona starting on the surface of the lead is used for determining the initial value of the field intensity of the corona starting on the surface of the lead;
a module for calculating the synthetic electric field intensity, which is used for calculating the synthetic electric field intensity E4 at the specific position on the ground according to the ion mobility;
a determine relative error sub-module for comparing the particular combined electric field strength E3 with the combined electric field strength E4 to determine a relative error;
the module for changing the initial value of the field intensity of the starting corona is used for changing the initial value of the field intensity of the starting corona if the relative error is larger than a preset error value delta;
and the submodule for determining the actual corona onset field intensity value is used for determining the current corona onset field intensity value as the actual corona onset field intensity value of the wire when the relative error is smaller than a specified value delta.
8. The system of claim 6, wherein the calculate composite electric field strength submodule comprises:
and a unit for calculating the synthetic electric field intensity, wherein the synthetic electric field intensity E4 at the specific position on the ground is calculated by adopting an analog charge method, a successive image method or a finite element method according to the ion mobility.
9. The system of claim 6, further comprising:
and the erecting wire module is used for erecting wires on the test line section in a single-pole erecting mode, a single-circuit horizontal erecting mode or a single-circuit vertical erecting mode.
10. The system of claim 6, wherein the means for measuring ion mobility comprises:
and the sub-module for measuring the ion mobility in the air by a voltage-current curve method, a pulse method or a migration tube method.
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| 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 |
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