CN111562467B - Halo-starting judgment method and system based on ground synthetic electric field measurement data - Google Patents

Abstract

The invention discloses a method and a system for determining blooming based on ground synthesized electric field measurement data, wherein the method comprises the following steps: collecting the synthetic electric field data of a plurality of positions preset on the periphery of the circuit; analyzing and processing the synthetic electric field data according to a preset rule to obtain ion current electric field logarithmic data; calculating to obtain the surface field intensity of the synthetic electric field data corresponding to each working condition; establishing a semilogarithmic coordinate system with surface field intensity as a horizontal coordinate and ion current electric field logarithmic data as a vertical coordinate to obtain semilogarithmic graphs of a plurality of measuring points; performing curve fitting on the plurality of measurement points to obtain a fitting curve; determining an environmental interference level according to a preset rule, and determining a starting corona field intensity through an intersection point of the environmental interference level and a fitting curve; the method and the system have strong adaptability, accord with the characteristic rule of experimental data, and are favorable for developing the corona onset field strength test of a large number of direct current leads around the circuit step by step.

Description

A halo initiation determination method and system based on ground synthetic electric field measurement data

technical field

The present invention relates to the field of electric power technology, and more specifically, to a halo initiation determination method and system based on ground synthetic electric field measurement data.

Background technique

The electromagnetic environment of UHV transmission lines is a major technical issue that must be considered in the design, construction and operation of UHV AC/DC transmission lines, and it is directly related to the corona characteristics of transmission lines. Considering economy, transmission lines are usually designed to allow a certain degree of corona discharge under normal operating voltage. Corona discharge will produce audible noise, radio interference and corona loss, etc., which will have a certain impact on the environment and operation. Considering construction and operation costs and environmental protection, it is very important for the development of UHV transmission to rationally design conductors and moderately control the corona effect.

These problems caused by corona are important technical issues that must be considered in the design, construction and operation of power transmission projects. In addition, with the continuous development of the economy and the enhancement of people's environmental awareness, its environmental impact has attracted more and more attention, and has become an important factor in determining the structure of transmission lines and affecting construction costs. Therefore, in order to strengthen the research on UHV transmission technology, reduce and avoid the occurrence of corona and the corona effect, it is necessary to analyze the corona characteristics of the wire and a series of problems it brings.

Corona cages are an economical and effective tool for simulating the electromagnetic environment of actual transmission lines. In the corona cage, it is more convenient to carry out the corona effect test of the true type wire under a wide range of voltages. However, the corona onset voltage test method of true wires in the corona cage is not yet mature, so it is necessary to carry out research on the corona inception voltage judgment method based on corona current in the corona cage.

my country has become a big DC power transmission country in the world. However, no systematic research has been carried out on the inception field strength of UHV DC transmission lines, so that it is impossible to accurately judge the inception field strength, and it is even more difficult to carry out the inception field strength of a large number of DC conductors. Halo field strength test, it is difficult to carry out follow-up research on halo field strength of UHV DC lines.

Contents of the invention

In order to solve the problem in the background technology that there is a lack of research on the halo initiation field strength of UHVDC transmission lines so that it is difficult to accurately judge the halo initiation field strength, the present invention provides a method and system for halo initiation judgment based on ground synthetic electric field measurement data; The method and system obtain the halo initiation field strength by collecting the ion current electric field and the wire surface field strength and establishing a corresponding relationship by considering the environmental interference level; the halo initiation determination method based on the ground synthetic electric field measurement data includes:

Collect synthetic electric field data from multiple preset positions around the line;

Analyze and process the synthetic electric field data shown according to preset rules to obtain the logarithmic data of the ion current electric field;

Calculate and obtain the surface field strength corresponding to each working condition of the synthetic electric field data;

Establish a semi-logarithmic coordinate system with the surface field strength as the abscissa and the logarithmic data of the ion current electric field as the ordinate, and obtain the semi-logarithmic line diagram of multiple measurement points;

performing curve fitting on the plurality of measurement points to obtain a fitting curve;

The environmental interference level is determined according to preset rules, and the halo inducing field strength is determined through the intersection of the environmental interference level and the fitting curve.

Further, the collection of synthetic electric field data at preset positions in the corona cage includes:

Acquisition of raw synthetic electric field signals at multiple locations through an electric field sensing array at a preset location in the corona cage;

Perform analog-to-digital conversion on the original electric field signal and transmit it through an optical fiber to obtain synthetic electric field data.

Further, the analysis and processing of the synthetic electric field data shown according to preset rules to obtain the logarithmic data of the ion current electric field includes:

Extracting the synthetic electric field data of each position according to the preset ratio, and performing weighted calculation on the synthetic electric field of each position according to the preset weight value corresponding to the position, to obtain the weighted synthetic electric field data;

Judging the weighted synthetic electric field data according to a preset method, and eliminating abnormal data;

Eliminate the zero point error, and average the weighted synthetic electric field data of multiple positions for each measurement to obtain the processed synthetic electric field data;

Transforming the processed synthetic electric field data to obtain ion current electric field data, and performing logarithmic transformation on the ion current electric field data to obtain ion current electric field logarithmic data.

Further, the preset method includes the Grubbs criterion method, the Dixon criterion method and the Chauwell criterion method;

The abnormal number threshold is set, and when the abnormal number of weighted synthetic electric field data corresponding to any position reaches the abnormal frequency threshold within a preset time period, all the weighted synthetic electric field data of the measurement position are discarded.

Further, the calculation method of the surface field strength includes finite element method, simulated charge method and formula method.

Further, said performing curve fitting on said plurality of measurement points to obtain a fitting curve includes:

Calculate the curve fitting cut-off point according to the preset rules;

Carry out linear fitting to a plurality of measurement points whose abscissa is less than or equal to the abscissa of the demarcation point;

Logarithmic fitting is performed on multiple measurement points whose abscissa is greater than or equal to the abscissa of the cut-off point.

Further, the calculation formula of the curve fitting cut-off point is:

Among them, E′ _i is the logarithmic value of the ion current electric field at the i-th measurement point, and E _i is the surface field strength of the wire at the i-th measurement point.

Further, the halo initiation field strength includes the surface field strength value corresponding to the intersection point of the environmental interference level and the linear fitting curve, and the surface field strength value corresponding to the intersection point of the environmental interference level and the logarithmic fitting curve.

Further, the environmental interference level is a straight line parallel to the abscissa at the point of intersection of the ordinate in the semi-logarithmic line diagram; The average value in the number coordinates.

Described a kind of halo onset determination system based on ground synthetic electric field measurement data comprises:

A data acquisition unit, the data acquisition unit is used to collect synthetic electric field data of multiple positions preset in the corona cage;

A data processing unit, the data processing unit is used to analyze and process the synthetic electric field data shown according to preset rules, and obtain the logarithmic data of the ion current electric field;

A surface field strength calculation unit, the surface field strength calculation unit is used to calculate and obtain the surface field strength corresponding to each working condition of the synthetic electric field data;

A curve fitting unit, the curve fitting unit is used to establish a semi-logarithmic coordinate system with the surface field strength as the abscissa and the logarithmic data of the ion current electric field as the ordinate, to obtain a semi-logarithmic line diagram of a plurality of measurement points ;

The curve fitting unit is used to perform curve fitting on the plurality of measurement points to obtain a fitting curve;

A halo initiation field strength determination unit, the halo initiation field strength determination unit is configured to determine the environmental interference level according to preset rules, and determine the halo initiation field strength through the intersection of the environmental interference level and the fitting curve.

Further, the data acquisition unit includes an electric field sensor array, a data preprocessing module, an optical fiber data transmission module, and an optical fiber data transceiver module;

The electric field sensor array is arranged in the corona cage according to a plurality of preset positions; the electric field sensor array collects original synthetic electric field signals at their respective positions;

The data preprocessing module is arranged at a position close to the corona cage and connected to the electric field sensor array; the data preprocessing module is used to perform analog-to-digital conversion on the original electric field signal to obtain synthetic electric field data;

One end of the optical fiber data transmission module is connected to the data preprocessing module, and the other end is connected to the optical fiber data transceiver module far away from the corona cage; the optical fiber data transmission module is used to transmit the synthetic electric field data to the optical fiber through the optical fiber line Data transceiver module;

The optical fiber data transceiver module is used to connect with the data processing unit, and transmit the synthesized electric field data to the data processing unit.

Further, the data processing unit is used to extract the composite electric field data of each location according to a preset ratio, and perform weighted calculation on the composite electric field of each location according to a preset weight value corresponding to the location to obtain a weighted Synthetic electric field data;

The data processing unit is used to judge the weighted synthetic electric field data according to a preset method, and eliminate abnormal data;

The data processing unit is used to eliminate the zero point error, and average the weighted synthetic electric field data of multiple positions measured each time to obtain the processed synthetic electric field data;

The data processing unit is used to transform the processed synthetic electric field data to obtain ion current electric field data, and logarithmically transform the ion current electric field data to obtain ion current electric field logarithmic data.

Further, the preset method includes the Grubbs criterion method, the Dixon criterion method and the Chauwell criterion method;

The data processing unit is used to set the abnormal number threshold, and when the abnormal number of weighted synthetic electric field data corresponding to any position reaches the abnormal frequency threshold within a preset time period, all the weighted synthetic electric field data of the measurement position will be discarded.

Further, the method for calculating the surface field strength by the surface field strength calculation unit includes finite element method, simulated charge method and formula method.

Further, the curve fitting unit is used to calculate the curve fitting cut-off point according to preset rules;

The curve fitting unit is used to linearly fit a plurality of measurement points whose abscissa is less than or equal to the abscissa of the boundary point;

The curve fitting unit is used for performing logarithmic fitting on a plurality of measurement points whose abscissa is greater than or equal to the abscissa of the boundary point.

Further, the calculation formula of the curve fitting cut-off point is:

Among them, E′ _i is the logarithmic value of the ion current electric field at the i-th measurement point, and E _i is the surface field strength of the wire at the i-th measurement point.

Further, the halo initiation field strength includes the surface field strength value corresponding to the intersection point of the environmental interference level and the linear fitting curve, and the surface field strength value corresponding to the intersection point of the environmental interference level and the logarithmic fitting curve.

Further, the environmental interference level is a straight line parallel to the abscissa at the point of intersection of the ordinate in the semi-logarithmic line diagram; The average value in the number coordinates.

The beneficial effects of the present invention are: the technical scheme of the present invention provides a halo initiation determination method and system based on ground synthetic electric field measurement data; the method and system collect ion current electric field and wire surface field strength, and establish Corresponding relationship, by considering the environmental interference level to obtain the halo field strength; the method and system have strong adaptability, conform to the characteristics of the experimental data, and are conducive to carrying out the halo field strength test of a large number of DC wires step by step in the corona cage, It is also a good technical reserve for the study of the haloing characteristics of the true type split wire.

Description of drawings

A more complete understanding of the exemplary embodiments of the present invention can be had by referring to the following drawings:

Fig. 1 is a flow chart of a method for judging haloing based on ground synthetic electric field measurement data according to a specific embodiment of the present invention;

Fig. 2 is the schematic diagram that the linear fitting curve in the semi-logarithmic line figure of the specific embodiment of the present invention intersects with the environmental interference level to determine the field intensity of haloing;

Fig. 3 is the schematic diagram that the logarithmic fitting curve intersects with the environmental interference level in the semi-logarithmic diagram of the specific embodiment of the present invention to determine the field intensity of haloing;

Fig. 4 is a structural diagram of a halo initiation judgment system based on ground synthetic electric field measurement data according to a specific embodiment of the present invention;

Fig. 5 is a schematic layout diagram of an electric field sensor array according to a specific embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units/elements are given the same reference numerals.

Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overly formal meanings.

Fig. 1 is the flow chart of a kind of halo initiation determination method based on ground synthetic electric field measurement data of the specific embodiment of the present invention; As shown in Fig. 1, described method comprises:

Step 110, collecting synthetic electric field data at multiple preset locations around the line;

Specifically, in this embodiment, the test platform of the corona cage is used to realize the determination of the corona field strength of the wire by collecting the actual ground synthetic electric field measurement data in the corona cage; in the corona cage, The electric field sensors with multiple positions are preset to collect the synthetic electric field; specifically:

Acquisition of raw synthetic electric field signals at multiple locations through an electric field sensing array at a preset location in the corona cage;

Perform analog-to-digital conversion on the original electric field signal to convert it into a digital signal to obtain synthetic electric field data.

Generally, the system corresponding to this method is set at a position away from the corona cage, so the synthetic electric field data is transmitted through pre-laid and connected optical fibers.

Step 120, analyzing and processing the synthetic electric field data shown according to preset rules to obtain the logarithmic data of the ion current electric field;

For the original synthetic electric field data, there may be abnormal points that will affect the accuracy of the subsequent curve fitting, so the data needs to be preliminarily processed; the methods used to eliminate the abnormal data include the Rabs criterion method and the Dixon criterion method And the Shawiller criterion method; one or several criterion methods can be selected according to the needs to realize the elimination of abnormal data; specifically:

Step 121, extracting the synthetic electric field data of each position according to the preset ratio, and performing weighted calculation on the synthetic electric field of each position according to the preset weight value corresponding to the position, to obtain the weighted synthetic electric field data;

In order to improve the calculation efficiency, it is not necessary to use all the synthetic electric field data, but to extract according to a certain ratio, the certain ratio can be 50%, or all the data can be used to set the ratio to 100%;

At the same time, because the electric field sensor array is arranged in different positions in the corona cage, and the relative position to the wire is also different, the synthetic electric field measured by it needs to be converted to be comparable, so it is necessary to determine the predetermined position by feeling the position. Set the weight value to realize the weighted calculation.

Step 122, judge the weighted synthetic electric field data according to a preset method, and eliminate abnormal data;

In particular, an abnormal number threshold is set, and when the abnormal number of weighted composite electric field data corresponding to any location reaches the abnormal number threshold within a preset time period, all weighted composite electric field data at the measurement location are discarded.

Step 123, eliminate the zero point error, and average the weighted synthetic electric field data of multiple positions for each measurement to obtain processed synthetic electric field data;

Step 124, transforming the processed synthetic electric field data to obtain ion current electric field data, and performing logarithmic transformation on the ion current electric field data to obtain ion current electric field logarithmic data.

Step 130, calculating and obtaining the surface field strength corresponding to each working condition of the synthetic electric field data;

The calculation method of the surface field strength includes finite element method, simulated charge method and formula method.

The calculated surface field strength is in one-to-one correspondence with the logarithmic data of the ion current electric field;

Step 140, establishing a semi-logarithmic coordinate system with the surface field strength as the abscissa and the ion current electric field logarithmic data as the ordinate, to obtain a semi-logarithmic line diagram of multiple measurement points;

The surface field strength calculated in the previous step is in one-to-one correspondence with the logarithmic data of the ion current electric field to form a plurality of measurement points, which are marked in a semi-logarithmic line diagram.

Step 150, performing curve fitting on the plurality of measurement points to obtain a fitting curve;

According to the actual characteristics of the data, when performing curve fitting, perform segmented curve fitting; when the guide just enters the halo state, although the surface field strength of the ion current increases steadily, it is in a linear form; In the semi-logarithmic line graph, the trend is relatively slow, and the logarithmic form should be used for fitting;

Between curve fitting and logarithmic fitting, there is a cutoff point for piecewise curves;

The calculation formula of the curve fitting cut-off point is:

Among them, E′ _i is the logarithmic value of the ion current electric field at the i-th measurement point, and E _i is the surface field strength of the wire at the i-th measurement point.

The cut-off point is calculated by a large number of experimental data, and the generally selected value is 0.003.

Carry out linear fitting to a plurality of measurement points whose abscissa is less than or equal to the abscissa of the demarcation point;

Logarithmic fitting is performed on multiple measurement points whose abscissa is greater than or equal to the abscissa of the cut-off point.

Step 160, determine the environmental interference level according to preset rules, and determine the halo inducing field strength through the intersection point of the environmental interference level and the fitting curve.

Described environmental interference level refers to the straight line that is constant and parallel to the abscissa in the semi-logarithmic line diagram with the intersection point of the ordinate; The average value in the number coordinates.

In the semi-logarithmic line diagram, it is generally the first two to three minimum values; and because there is an error in the synthetic electric field measurement system itself, the error interval is of the same order of magnitude as the minimum value, so the ion current electric field is often used to 0 as the constant.

Fig. 2 is the schematic diagram that the intersection of linear fitting curve and environmental disturbance level intersects and determines haloing field strength in semi-logarithmic line graph;

This figure is the experimental data of the 4*400mm ² type wire selected for the test; the environmental interference level in the semi-logarithmic line graph is selected as the horizontal line where the electric field of the ion current is 0;

In the part where the logarithmic data of the ion current electric field rises steadily with the surface field strength, the fitting curve is obtained by linear fitting, as shown in the dotted line. By intersecting with the environmental interference level (solid line), the surface field strength at the intersection point is determined as 23.7805Kv/cm;

Figure 3 is a schematic diagram of determining the haloing field strength by the intersection of the logarithmic fitting curve and the environmental interference level in the semi-logarithmic line graph; in the part where the logarithmic data of the ion current electric field gradually becomes gentle with the surface field strength, the logarithmic fitting is obtained. The fitting curve is shown as a dotted line, and the surface field strength at the intersection point is determined to be 28.4132Kv/cm through the intersection with the environmental interference level (solid line);

Fig. 4 is a structural diagram of a halo initiation judgment system based on ground synthetic electric field measurement data according to a specific embodiment of the present invention; as shown in Fig. 4 , the system includes:

A data collection unit 410, the data collection unit 410 is used to collect synthetic electric field data at multiple preset positions around the line;

Further, the data acquisition unit 410 includes an electric field sensor array, a data preprocessing module, an optical fiber data transmission module, and an optical fiber data transceiver module;

As shown in Figure 5, it is a kind of way that the electric field sensor array is arranged in the corona cage; The electric field sensor array is arranged in the corona cage according to a plurality of preset positions; The electric field sensor array collects its respective The raw synthetic electric field signal of the position;

The data preprocessing module is arranged at a position close to the corona cage and connected to the electric field sensor array; the data preprocessing module is used to perform analog-to-digital conversion on the original electric field signal to obtain synthetic electric field data;

One end of the optical fiber data transmission module is connected to the data preprocessing module, and the other end is connected to the optical fiber data transceiver module far away from the corona cage; the optical fiber data transmission module is used to transmit the synthetic electric field data to the optical fiber through the optical fiber line Data transceiver module;

The optical fiber data transceiver module is used to connect with the data processing unit, and transmit the synthesized electric field data to the data processing unit 420 .

A data processing unit 420, the data processing unit 420 is configured to analyze and process the synthetic electric field data shown according to preset rules to obtain logarithmic data of the ion current electric field;

Further, the data processing unit 420 is configured to extract the combined electric field data of each position according to a preset ratio, and perform weighted calculation on the combined electric field of each position according to a preset weight value corresponding to the position, to obtain Weighted synthetic electric field data;

The data processing unit 420 is used for judging the weighted synthetic electric field data according to a preset method, and removing abnormal data;

The data processing unit 420 is used to eliminate the zero point error, and average the weighted synthetic electric field data of multiple positions of each measurement to obtain the processed synthetic electric field data;

The data processing unit 420 is used to transform the processed synthetic electric field data to obtain ion current electric field data, and logarithmically transform the ion current electric field data to obtain ion current electric field logarithmic data.

Further, the preset method includes the Grubbs criterion method, the Dixon criterion method and the Chauwell criterion method;

The data processing unit 420 is used to set a threshold of abnormal times. When the abnormal times of the weighted synthetic electric field data corresponding to any position reaches the threshold of abnormal times within a preset time period, all the weighted synthetic electric field data of the measurement position will be discarded.

The surface field strength calculation unit 430, the surface field strength calculation unit 430 is used to calculate and obtain the surface field strength corresponding to each working condition of the synthetic electric field data;

Further, the methods for calculating the surface field strength by the surface field strength calculation unit 430 include finite element method, simulated charge method and formula method.

Curve fitting unit 440, the curve fitting unit 440 is used to establish a semi-logarithmic coordinate system with the surface field strength as the abscissa and the ion current electric field logarithmic data as the ordinate, to obtain the semi-logarithm of a plurality of measurement points line graph;

The curve fitting unit 440 is used to perform curve fitting on the plurality of measurement points to obtain a fitting curve;

The halo initiation field strength determination unit 450, the halo initiation field strength determination unit 450 is configured to determine the environmental interference level according to preset rules, and determine the halo initiation field strength through the intersection of the environmental interference level and the fitting curve.

Further, the curve fitting unit 440 is used to calculate the curve fitting cut-off point according to preset rules;

The curve fitting unit 440 is used to perform linear fitting on a plurality of measurement points whose abscissa is less than or equal to the abscissa of the dividing point;

The curve fitting unit 440 is used for performing logarithmic fitting on a plurality of measurement points whose abscissa is greater than or equal to the abscissa of the boundary point.

Further, the calculation formula of the curve fitting cut-off point is:

Among them, E′ _i is the logarithmic value of the ion current electric field at the i-th measurement point, and E _i is the surface field strength of the wire at the i-th measurement point.

Further, the halo initiation field strength includes the surface field strength value corresponding to the intersection point of the environmental interference level and the linear fitting curve, and the surface field strength value corresponding to the intersection point of the environmental interference level and the logarithmic fitting curve.

Further, the environmental interference level is a straight line parallel to the abscissa at the point of intersection of the ordinate in the semi-logarithmic line diagram; The average value in the number coordinates.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure the understanding of this description.

Those skilled in the art can understand that the modules in the device in the embodiment can be adaptively changed and arranged in one or more devices different from the embodiment. Modules or units or components in the embodiments may be combined into one module or unit or component, and furthermore may be divided into a plurality of sub-modules or sub-units or sub-assemblies. All features disclosed in this specification (including accompanying claims, abstract and drawings) and any method or method so disclosed may be used in any combination, except that at least some of such features and/or processes or units are mutually exclusive. All processes or units of equipment are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. The step numbers involved in this specification are only used to distinguish each step, and are not used to limit the time or logical relationship between each step. Unless otherwise clearly defined in the text, the relationship between each step includes various possible Happening.

In addition, those skilled in the art will understand that although some embodiments described herein include some features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the present disclosure. and form different embodiments. For example, any one of the embodiments claimed in the claims may be used in any combination.

The various component embodiments of the present disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure can also be implemented as an apparatus or system program (eg, computer program and computer program product) for performing a part or all of the methods described herein. Such a program realizing the present disclosure may be stored on a computer-readable medium, or may have the form of one or more signals. Such a signal may be downloaded from an Internet site, or provided on a carrier signal, or provided in any other form.

It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a unit claim enumerating several systems, several of these systems can be embodied by one and the same item of hardware.

The above descriptions are only specific implementations of the present disclosure. It should be noted that those skilled in the art can make several improvements, modifications, and variations without departing from the spirit of the present disclosure. These improvements, Modifications and deformations should be considered as falling within the scope of protection of this application.

Claims (14)

1. a method for judging haloing based on ground synthetic electric field measurement data, is characterized in that, described method comprises: Collect synthetic electric field data from multiple preset positions around the line; Analyzing and processing the synthetic electric field data according to preset rules to obtain logarithmic data of the ion current electric field; Calculate and obtain the surface field strength corresponding to each working condition of the synthetic electric field data; Establish a semi-logarithmic coordinate system with the surface field strength as the abscissa and the logarithmic data of the ion current electric field as the ordinate, and obtain the semi-logarithmic line diagram of multiple measurement points; performing curve fitting on the plurality of measurement points to obtain a fitting curve; The described method of performing curve fitting on the plurality of measurement points to obtain a fitting curve includes: Calculate the curve fitting cut-off point according to the preset rules; Carry out linear fitting to a plurality of measurement points whose abscissa is less than or equal to the abscissa of the demarcation point; Carry out logarithmic fitting to a plurality of measurement points whose abscissa is greater than or equal to the abscissa of the demarcation point; The calculation formula of the curve fitting cut-off point is:

Among them, E' _i is the logarithmic value of the ion current electric field at the i-th measurement point, E _i is the surface field strength of the wire at the i-th measurement point; The environmental interference level is determined according to preset rules, and the halo inducing field strength is determined through the intersection of the environmental interference level and the fitting curve. 2. The method according to claim 1, wherein the collection of synthetic electric field data at preset positions around the line comprises: The original synthetic electric field signals of multiple positions are collected through the electric field sensing array at the preset position around the line; Perform analog-to-digital conversion on the original synthetic electric field signal and transmit it through optical fiber to obtain synthetic electric field data. 3. method according to claim 1, is characterized in that, described synthetic electric field data is analyzed and processed according to preset rules, obtains ion flow electric field logarithmic data, comprising: Extracting the synthetic electric field data of each position according to the preset ratio, and performing weighted calculation on the synthetic electric field of each position according to the preset weight value corresponding to the position, to obtain the weighted synthetic electric field data; Judging the weighted synthetic electric field data according to a preset method, and eliminating abnormal data; Eliminate the zero point error, and average the weighted synthetic electric field data of multiple positions for each measurement to obtain the processed synthetic electric field data; Transforming the processed synthetic electric field data to obtain ion current electric field data, and performing logarithmic transformation on the ion current electric field data to obtain ion current electric field logarithmic data. 4. The method according to claim 3, characterized in that: The preset methods include Grubbs' criterion, Dixon's criterion and Chauvier's criterion; An abnormal number threshold is set, and when the abnormal number of weighted synthetic electric field data corresponding to any position reaches the abnormal frequency threshold within a preset time period, all weighted synthetic electric field data at any position is discarded. 5. The method according to claim 1, characterized in that: the calculation method of the surface field strength includes finite element method, simulated charge method and formula method. 6. The method according to claim 1, characterized in that: The halo initiation field strength includes a surface field strength value corresponding to the intersection point of the environmental interference level and the linear fitting curve, and a surface field strength value corresponding to the intersection point of the environmental interference level and the logarithmic fitting curve. 7. The method according to claim 1, characterized in that: the environmental interference level is a straight line that is constant and parallel to the abscissa in the semi-logarithmic graph with the intersection point of the ordinate; The average value of the nominal electric field data in semi-logarithmic coordinates before logarithmic transformation of the electric field. 8. A halo initiation judgment system based on ground synthetic electric field measurement data, is characterized in that, described system comprises: A data acquisition unit, the data acquisition unit is used to collect synthetic electric field data at multiple preset positions around the line; A data processing unit, the data processing unit is used to analyze and process the synthetic electric field data according to preset rules to obtain logarithmic data of the ion current electric field; A surface field strength calculation unit, the surface field strength calculation unit is used to calculate and obtain the surface field strength corresponding to each working condition of the synthetic electric field data; A curve fitting unit, the curve fitting unit is used to establish a semi-logarithmic coordinate system with the surface field strength as the abscissa and the logarithmic data of the ion current electric field as the ordinate, to obtain a semi-logarithmic line diagram of a plurality of measurement points ; The curve fitting unit is used to perform curve fitting on the plurality of measurement points to obtain a fitting curve; The described method of performing curve fitting on the plurality of measurement points to obtain a fitting curve includes: Calculate the curve fitting cut-off point according to the preset rules; Carry out linear fitting to a plurality of measurement points whose abscissa is less than or equal to the abscissa of the demarcation point; Carry out logarithmic fitting to a plurality of measurement points whose abscissa is greater than or equal to the abscissa of the demarcation point; The calculation formula of the curve fitting cut-off point is:

Among them, E' _i is the logarithmic value of the ion current electric field at the i-th measurement point, E _i is the surface field strength of the wire at the i-th measurement point; A halo initiation field strength determination unit, the halo initiation field strength determination unit is configured to determine the environmental interference level according to preset rules, and determine the halo initiation field strength through the intersection of the environmental interference level and the fitting curve. 9. The system according to claim 8, wherein the data acquisition unit includes an electric field sensor array, a data preprocessing module, an optical fiber data transmission module, and an optical fiber data transceiver module; The electric field sensor array is arranged in the corona cage according to a plurality of preset positions; the electric field sensor array collects original synthetic electric field signals at their respective positions; The data preprocessing module is arranged at a position close to the corona cage and is connected to the electric field sensor array; the data preprocessing module is used for performing analog-to-digital conversion on the original synthetic electric field signal to obtain synthetic electric field data; One end of the optical fiber data transmission module is connected to the data preprocessing module, and the other end is connected to the optical fiber data transceiver module far away from the corona cage; the optical fiber data transmission module is used to transmit the synthetic electric field data to the optical fiber through the optical fiber line Data transceiver module; The optical fiber data transceiver module is used to connect with the data processing unit, and transmit the synthesized electric field data to the data processing unit. 10. The system of claim 8, wherein: The data processing unit is used to extract the synthetic electric field data of each position according to a preset ratio, and perform weighted calculation on the synthetic electric field of each position according to the preset weight value corresponding to the position, to obtain weighted synthetic electric field data ; The data processing unit is used to judge the weighted synthetic electric field data according to a preset method, and eliminate abnormal data; The data processing unit is used to eliminate the zero point error, and average the weighted synthetic electric field data of multiple positions measured each time to obtain the processed synthetic electric field data; The data processing unit is used to transform the processed synthetic electric field data to obtain ion current electric field data, and logarithmically transform the ion current electric field data to obtain ion current electric field logarithmic data. 11. The system according to claim 10, wherein the preset method includes Rabbs', Dixon's and Chauvier's criteria; The data processing unit is used to set an abnormal number threshold, and when the abnormal number of weighted synthetic electric field data corresponding to any position reaches the abnormal number threshold within a preset time period, all weighted synthetic electric field data at any position is discarded . 12. The system according to claim 8, characterized in that: the method for calculating the surface field strength by the surface field strength calculation unit includes finite element method, simulated charge method and formula method. 13. The system according to claim 8, characterized in that: the halo initiation field strength includes the surface field strength value corresponding to the intersection point of the environmental interference level and the linear fitting curve, and the level of environmental interference and the logarithmic fitting The intersection of the curves corresponds to the value of the surface field strength. 14. The system according to claim 8, characterized in that: the environmental interference level is a straight line parallel to the abscissa as a constant and parallel to the abscissa in the semi-logarithmic graph; The average value of the nominal electric field data in semi-logarithmic coordinates before logarithmic transformation of the electric field.

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