CN111562467B - Halo-starting judgment method and system based on ground synthetic electric field measurement data - Google Patents
Halo-starting judgment method and system based on ground synthetic electric field measurement data Download PDFInfo
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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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
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a system for determining blooming based on ground synthetic electric field measurement data.
Background
The electromagnetic environment problem of the extra-high voltage transmission line is a major technical problem which must be considered in the design, construction and operation of the extra-high voltage alternating current and direct current transmission line, and is directly related to the corona characteristic of the transmission line. In view of economy, transmission lines are typically designed to allow a certain degree of corona discharge at normal operating voltages. Corona discharge will produce audible noise, radio interference, corona loss, etc., which will have a certain impact on the environment and operation. The reasonable design of the conducting wire and the moderate control of the corona effect are very important for developing the ultra-high voltage transmission from the aspects of construction and operation cost, environmental protection and the like.
These problems caused by corona are significant technical issues that must be considered in the design, construction and operation of electrical transmission projects. In addition, with the continuous development of economy and the enhancement of environmental awareness of the people, the environmental influence problem is more and more concerned by people and strictly restricted by environmental protection, and the environmental influence problem becomes an important factor for determining the structure of the power transmission line and influencing construction cost and the like. Therefore, in order to strengthen the research of the ultra-high voltage transmission technology and reduce and avoid the occurrence of corona and the corona effect, the corona characteristic of the conducting wire and a series of problems caused by the corona characteristic must be analyzed.
The corona cage is an economic and effective tool for simulating the electromagnetic environment of an actual power transmission line. The corona effect test of the true conductor under a larger range of voltage can be conveniently carried out in the corona cage. However, the corona onset voltage test method for developing a true wire in a corona cage is not yet mature, and therefore, it is necessary to develop a corona current-based corona onset voltage determination method in the corona cage.
China becomes a world-wide direct-current transmission big country, however, systematic research has not been carried out on the aspect of the starting field intensity of the extra-high voltage direct-current transmission line, so that the starting field intensity cannot be accurately judged, the starting field intensity tests of a large number of direct-current wires are more difficult to carry out, and the subsequent research on the starting field intensity of the extra-high voltage direct-current line is difficult to carry out.
Disclosure of Invention
In order to solve the problem that the field intensity of the corona onset of an extra-high voltage direct current transmission line is lack of research in the background technology so that the field intensity of the corona onset is difficult to accurately judge, the invention provides a method and a system for determining the corona onset based on ground synthesized electric field measurement data; the method and the system acquire the ionic current electric field and the surface field intensity of the wire, establish a corresponding relation and obtain the corona onset field intensity by considering the environmental interference level; the halo judgment method based on the ground synthetic electric field measurement data 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 synthesized 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 the environmental interference level according to a preset rule, and determining the starting field intensity through the intersection point of the environmental interference level and the fitting curve.
Further, gather the synthetic electric field data of predetermineeing the position in the corona cage, include:
collecting original synthesized electric field signals at a plurality of positions through an electric field sensing array at a preset position in a corona cage;
and performing analog-to-digital conversion on the original electric field signal, and transmitting the analog-to-digital conversion through an optical fiber to obtain synthesized electric field data.
Further, the analyzing and processing the synthesized electric field data according to a preset rule to obtain ion current electric field logarithm data includes:
extracting the synthetic electric field data of each position according to a preset proportion, and performing weighted calculation on the synthetic electric field of each position according to a preset weight value corresponding to the position to obtain weighted synthetic electric field data;
judging the weighted synthesized electric field data according to a preset method, and rejecting abnormal data;
eliminating zero point errors, and averaging weighted synthesized electric field data of a plurality of positions measured each time to obtain processed synthesized electric field data;
and converting the processed synthesized electric field data to obtain ion current electric field data, and carrying out logarithmic conversion on the ion current electric field data to obtain ion current electric field logarithmic data.
Further, the preset method includes a grabbs criterion method, a dixon criterion method, and a scheimpflug criterion method;
and setting an abnormal frequency threshold, and discarding all weighted synthesized electric field data at the measuring position when the abnormal frequency of the weighted synthesized electric field data corresponding to any position reaches the abnormal frequency threshold in a preset time period.
Further, the calculation method of the surface field intensity comprises a finite element method, a simulated charge method and a formula method.
Further, performing curve fitting on the plurality of measurement points to obtain a fitted curve includes:
calculating curve fitting demarcation points according to a preset rule;
performing linear fitting on a plurality of measuring points of which the abscissa is less than or equal to the abscissa of the dividing point;
and carrying out logarithmic fitting on a plurality of measuring points with the abscissa larger than or equal to the abscissa of the dividing point.
Further, the formula for calculating the curve fitting demarcation point is as follows:
wherein, E' i Logarithmic ion current and electric field values for the ith measurement point, E i The wire surface field strength of the ith measurement point.
Further, the corona onset field strength includes a surface field strength value corresponding to an intersection of the ambient interference level and the linear fit curve, and a surface field strength value corresponding to an intersection of the ambient interference level and the logarithmic fit curve.
Further, the environmental interference level is a straight line which is constant at an intersection point with a vertical coordinate and is parallel to a horizontal coordinate in the semi-logarithmic graph; the constant is the average value of the nominal electric field data in a semi-logarithmic coordinate before the ion current electric field is subjected to logarithmic transformation.
The halo determining system based on the ground synthesized electric field measurement data comprises:
the data acquisition unit is used for acquiring the data of a synthesized electric field at a plurality of positions preset in the corona cage;
the data processing unit is used for analyzing and processing the synthesized electric field data according to a preset rule to obtain ion current electric field logarithmic data;
the surface field intensity calculating unit is used for calculating and obtaining the surface field intensity of the synthesized electric field data corresponding to each working condition;
the curve fitting unit is used for establishing a semilogarithmic coordinate system which takes surface field intensity as a horizontal coordinate and takes ion current electric field logarithmic data as a vertical coordinate, and obtaining a semilogarithmic line graph of a plurality of measuring points;
the curve fitting unit is used for performing curve fitting on the plurality of measuring points to obtain a fitting curve;
and the corona onset field intensity determining unit is used for determining the environmental interference level according to a preset rule and determining the corona onset field intensity through the intersection point of the environmental interference level and the fitting curve.
Furthermore, the data acquisition unit comprises an electric field sensor array, a data preprocessing module, an optical fiber data transmission module and an optical fiber data receiving and transmitting 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 synthesized electric field signals of respective positions;
the data preprocessing module is arranged at a position close to the corona cage and connected with the electric field sensor array; the data preprocessing module is used for carrying out analog-to-digital conversion on the original electric field signal to obtain synthesized electric field data;
one end of the optical fiber data transmission module is connected with the data preprocessing module, and the other end of the optical fiber data transmission module is connected with an optical fiber data receiving and transmitting module far away from the corona cage; the optical fiber data transmission module is used for transmitting the synthesized electric field data to the optical fiber data receiving and transmitting module through an optical fiber line;
and the optical fiber data transceiver module is used for being connected with the data processing unit and transmitting the synthesized electric field data to the data processing unit.
Further, the data processing unit is configured to extract the synthesized electric field data of each position according to a preset ratio, and perform weighted calculation on the synthesized electric field of each position according to a preset weight value corresponding to the position, so as to obtain weighted synthesized electric field data;
the data processing unit is used for judging the weighted synthesized electric field data according to a preset method and rejecting abnormal data;
the data processing unit is used for eliminating zero errors and averaging weighted composite electric field data of a plurality of positions measured each time to obtain processed composite electric field data;
and the data processing unit is used for converting the processed synthesized electric field data to obtain ion current electric field data and carrying out logarithmic conversion on the ion current electric field data to obtain ion current electric field logarithmic data.
Further, the preset method includes a grabbs criterion method, a dixon criterion method, and a scheimpflug criterion method;
the data processing unit is used for setting an abnormal time threshold, and when the abnormal time of the weighted combined electric field data corresponding to any position reaches the abnormal time threshold in a preset time period, all weighted combined electric field data of the measuring position are discarded.
Further, the method for calculating the surface field intensity by the surface field intensity calculating unit comprises a finite element method, an analog charge method and a formula method.
Further, the curve fitting unit is used for calculating curve fitting demarcation points according to a preset rule;
the curve fitting unit is used for performing linear fitting on a plurality of measuring points of which the abscissa is less than or equal to the abscissa of the dividing point;
the curve fitting unit is used for carrying out logarithmic fitting on a plurality of measuring points of which the abscissa is greater than or equal to the abscissa of the dividing point.
Further, the formula for calculating the curve fitting demarcation point is as follows:
wherein, E' i Logarithmic ion current and electric field values for the ith measurement point, E i The wire surface field strength of the ith measurement point.
Further, the corona onset field strength includes a surface field strength value corresponding to an intersection of the ambient interference level and the linear fit curve, and a surface field strength value corresponding to an intersection of the ambient interference level and the logarithmic fit curve.
Further, the environmental interference level is a straight line which is in the semilogarithmic graph, has a constant intersection point with the ordinate and is parallel to the abscissa; the constant is an average value of nominal electric field data under a semilogarithmic coordinate before the ion current electric field is subjected to logarithmic transformation.
The invention has the beneficial effects that: the technical scheme of the invention provides a method and a system for determining the starting of corona based on the measurement data of a ground synthetic electric field; the method and the system acquire the ionic current electric field and the surface field intensity of the wire, establish a corresponding relation and obtain the corona onset field intensity by considering the environmental interference level; the method and the system have strong adaptability, accord with the characteristic rule of experimental data, are favorable for carrying out the corona onset field strength test of a large number of direct current conductors step by step in the corona cage, and make technical reserve for the research of the corona onset characteristic of the true split conductor.
Drawings
Exemplary embodiments of the invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flowchart of a halo decision method based on ground-based synthetic electric field measurement data according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of determining a corona onset field strength as a linear fit curve intersects with an environmental interference level in a semi-logarithmic graph in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of determining a corona onset field strength at the intersection of a log-fit curve with an ambient interference level in a semi-logarithmic graph in accordance with an embodiment of the present invention;
FIG. 4 is a block diagram of a halo estimation system based on ground synthesized electric field measurement data in accordance with one embodiment of the present invention;
FIG. 5 is a schematic diagram of an arrangement of an electric field sensor array according to an embodiment of the present invention.
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.
FIG. 1 is a flowchart of a halo determination method based on ground-based synthetic electric field measurement data according to an embodiment of the present invention; as shown in fig. 1, the method includes:
specifically, in this embodiment, the determination of the corona field intensity of the wire is realized by collecting actual ground-synthesized electric field measurement data in the corona cage by using a test platform, which is the corona cage; in the corona cage, electric field sensors at a plurality of positions are preset for collecting a synthesized electric field; specifically, the method comprises the following steps:
collecting original synthesized electric field signals at a plurality of positions through an electric field sensing array at a preset position in a corona cage;
and performing analog-to-digital conversion on the original electric field signal, converting the original electric field signal into a digital signal, and obtaining synthetic electric field data.
Generally, the system corresponding to the method is arranged at a position far away from the corona cage, so that the resultant electric field data is transmitted through optical fibers laid in advance for connection.
for original synthetic electric field data, abnormal points possibly exist to influence the accuracy of subsequent curve fitting, so that preliminary processing needs to be carried out on the data; the method for eliminating abnormal data comprises a Labrus criterion method, a Dixon criterion method and a ShowWiler criterion method; one or more standard methods can be selected according to requirements to eliminate abnormal data; specifically, the method comprises the following steps:
step 121, extracting the synthetic electric field data of each position according to a preset proportion, and performing weighted calculation on the synthetic electric field of each position according to a preset weight value corresponding to the position to obtain weighted synthetic electric field data;
in order to improve the operation efficiency, the data of the total synthesized electric field is not used, but extracted according to a certain proportion, wherein the certain proportion can be 50%, or the proportion can be set to be 100% by using the total data;
meanwhile, the electric field sensor array is arranged at different positions in the corona cage, the relative position of the electric field sensor array and the conducting wire is different, and the measured synthetic electric field can be compared only through certain conversion, so that the weighting calculation is realized through a preset weight value determined by sensing the position.
Step 122, judging the weighted synthesized electric field data according to a preset method, and eliminating abnormal data;
specifically, an abnormal frequency threshold is set, and when the abnormal frequency of the weighted combined electric field data corresponding to any position reaches the abnormal frequency threshold within a preset time period, all weighted combined electric field data of the measuring position are discarded.
Step 123, eliminating zero point errors, and averaging weighted synthesized electric field data of a plurality of positions measured each time to obtain processed synthesized electric field data;
and 124, converting the processed synthetic electric field data to obtain ion current electric field data, and carrying out logarithmic conversion on the ion current electric field data to obtain ion current electric field logarithmic data.
the calculation method of the surface field intensity comprises a finite element method, an analog charge method and a formula method.
Calculating the obtained surface field intensity, and corresponding to the ion current electric field logarithmic data one by one;
and the surface field intensity obtained by the calculation in the previous step corresponds to the ion current electric field logarithmic data one by one to form a plurality of measuring points which are marked in a semilogarithmic graph.
according to the actual characteristics of the data, when curve fitting is carried out, segmented curve fitting is carried out; when the guide just enters a corona starting state, although the surface field intensity of ion flow data is stably increased, the ion flow data is in a linear form; after the comprehensive corona starts, the trend in the semi-logarithmic line graph is relatively slow, and a logarithmic form fitting is used;
between the curve fit and the logarithmic fit, there are demarcation points for the piecewise curve;
the calculation formula of the curve fitting demarcation point is as follows:
wherein, E' i Logarithmic ion current and electric field values for the ith measurement point, E i The wire surface field strength of the ith measurement point.
The cut-off point is generally selected to be 0.003 through statistics of a large number of test data.
Performing linear fitting on a plurality of measuring points of which the abscissa is less than or equal to the abscissa of the dividing point;
and carrying out logarithmic fitting on a plurality of measuring points with the abscissa greater than or equal to the abscissa of the dividing point.
And 160, determining the environmental interference level according to a preset rule, and determining the starting field intensity through the intersection point of the environmental interference level and the fitting curve.
The environment interference level refers to a straight line which is constant at the intersection point of the semi-logarithmic graph and the ordinate and is parallel to the abscissa; the constant is the average value of the nominal electric field data in a semi-logarithmic coordinate before the ion current electric field is subjected to logarithmic transformation.
The first two to three minima are typical in semi-logarithmic graphs; since the synthetic electric field measurement system has an error, and the error interval and the minimum value are of the same order, the ion current electric field is usually 0 as the constant.
FIG. 2 is a schematic diagram of a linear fit curve in a semi-logarithmic graph intersecting an ambient interference level to determine a corona onset field strength;
the figure is drawn at 4 x 400mm 2 Experimental data of the model wire; selecting the environment interference level as a horizontal line with an ion current electric field of 0 in the semilogarithmic graph;
the ion current electric field logarithmic data is subjected to linear fitting at the part which is stably raised along with the surface field intensity to obtain a fitting curve as shown by a dotted line, and the surface field intensity of the intersection point is determined to be 23.7805Kv/cm through the intersection with the environmental interference level (solid line);
FIG. 3 is a schematic diagram of a logarithmic fit curve in a semi-logarithmic graph intersecting an ambient interference level to determine a corona onset field strength; obtaining a fitting curve as shown by a dotted line by log fitting at the part of the ion current electric field logarithmic data gradually gentle along with the surface field intensity, and determining the surface field intensity of the intersection point to be 28.4132Kv/cm through the intersection with the environmental interference level (solid line);
FIG. 4 is a block diagram of a halo determination system based on ground synthesized electric field measurement data in accordance with an embodiment of the present invention; as shown in fig. 4, the system includes:
the data acquisition unit 410 is used for acquiring the synthetic electric field data of a plurality of positions preset on the periphery of 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 fig. 5, one way in which an array of electric field sensors is arranged in a 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 original synthesized electric field signals of respective positions;
the data preprocessing module is arranged at a position close to the corona cage and connected with the electric field sensor array; the data preprocessing module is used for carrying out analog-to-digital conversion on the original electric field signal to obtain synthesized electric field data;
one end of the optical fiber data transmission module is connected with the data preprocessing module, and the other end of the optical fiber data transmission module is connected with the optical fiber data receiving and transmitting module far away from the corona cage; the optical fiber data transmission module is used for transmitting the synthesized electric field data to the optical fiber data receiving and transmitting module through an optical fiber line;
the optical fiber data transceiver module is configured to connect to the data processing unit, and transmit the synthesized electric field data to the data processing unit 420.
The data processing unit 420 is configured to analyze and process the synthetic electric field data according to a preset rule to obtain ion current electric field logarithm data;
further, the data processing unit 420 is configured 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 a preset weight value corresponding to the position, so as to obtain weighted synthetic electric field data;
the data processing unit 420 is configured to determine the weighted synthesized electric field data according to a preset method, and reject abnormal data;
the data processing unit 420 is configured to eliminate a zero error, and average weighted composite electric field data at a plurality of positions measured each time to obtain processed composite electric field data;
the data processing unit 420 is configured to convert the processed synthesized electric field data to obtain ion current electric field data, and perform logarithmic conversion on the ion current electric field data to obtain ion current electric field logarithmic data.
Further, the preset method includes a grabbs criterion method, a dixon criterion method, and a schowerland criterion method;
the data processing unit 420 is configured to set an anomaly threshold, and discard all weighted synthesized electric field data at any measurement position when the anomaly of the weighted synthesized electric field data corresponding to any position reaches the anomaly threshold within a preset time period.
The surface field intensity calculating unit 430, the surface field intensity calculating unit 430 is configured to calculate and obtain the surface field intensity of the synthesized electric field data corresponding to each working condition;
further, the method of calculating the surface field intensity by the surface field intensity calculating unit 430 includes a finite element method, an analog charge method, and a formula method.
The curve fitting unit 440 is used for establishing a semilogarithmic coordinate system which takes surface field intensity as a horizontal coordinate and ion current electric field logarithmic data as a vertical coordinate, and obtaining a semilogarithmic line graph of a plurality of measuring points;
the curve fitting unit 440 is configured to perform curve fitting on the plurality of measurement points to obtain a fitted curve;
and the corona onset field strength determining unit 450, wherein the corona onset field strength determining unit 450 is configured to determine an environmental interference level according to a preset rule, and determine a corona onset field strength through an intersection point of the environmental interference level and a fitting curve.
Further, the curve fitting unit 440 is configured to calculate a curve fitting dividing point according to a preset rule;
the curve fitting unit 440 is configured 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 configured to perform a logarithmic fitting on a plurality of measurement points whose abscissa is greater than or equal to the abscissa of the dividing point.
Further, the formula for calculating the curve fitting demarcation point is as follows:
wherein, E' i Logarithmic ion current and electric field values for the ith measurement point, E i The surface field strength of the wire at the ith measurement point.
Further, the corona onset field strength includes a surface field strength value corresponding to an intersection of the ambient interference level and the linear fit curve, and a surface field strength value corresponding to an intersection of the ambient interference level and the logarithmic fit curve.
Further, the environmental interference level is a straight line which is constant at an intersection point with a vertical coordinate and is parallel to a horizontal coordinate in the semi-logarithmic graph; the constant is an average value of nominal electric field data under a semilogarithmic coordinate before the ion current electric field is subjected to logarithmic transformation.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the 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 an understanding of this description.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Reference to step numbers in this specification is only used to distinguish steps and is not intended to limit temporal or logical relationships between steps, and relationships between steps include possible ones, unless the context clearly dictates otherwise.
Moreover, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the disclosure and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination.
Various component embodiments of the disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure may also be embodied as device or system programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present disclosure may be stored on a computer-readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or 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 may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware.
The foregoing is directed to embodiments of the present disclosure, and it is noted that numerous improvements, modifications, and variations may be made by those skilled in the art without departing from the spirit of the disclosure, and that such improvements, modifications, and variations are considered to be within the scope of the present disclosure.
Claims (14)
1. A halo judgment method based on ground synthesized electric field measurement data is characterized by comprising 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 which takes surface field intensity as a horizontal coordinate and ion current electric field logarithmic data as a vertical coordinate, and obtaining semilogarithmic graphs of a plurality of measuring points;
performing curve fitting on the plurality of measurement points to obtain a fitting curve;
performing curve fitting on the plurality of measurement points to obtain a fitted curve, including:
calculating curve fitting demarcation points according to a preset rule;
performing linear fitting on a plurality of measuring points of which the abscissa is less than or equal to the abscissa of the dividing point;
carrying out logarithmic fitting on a plurality of measuring points of which the abscissa is greater than or equal to the abscissa of the dividing point;
the calculation formula of the curve fitting demarcation point is as follows:
wherein, E' i Logarithmic ion current and electric field values for the ith measurement point, E i The surface field intensity of the wire at the ith measuring point;
determining the environmental interference level according to a preset rule, and determining the starting field intensity through the intersection point of the environmental interference level and the fitting curve.
2. The method of claim 1, wherein the collecting the resultant electric field data at the predetermined location around the line comprises:
acquiring original synthesized electric field signals at a plurality of positions through an electric field sensing array at a preset position on the periphery of the circuit;
and performing analog-to-digital conversion on the original synthesized electric field signal, and transmitting the analog-to-digital conversion through an optical fiber to obtain synthesized electric field data.
3. The method according to claim 1, wherein the analyzing the synthetic electric field data according to a preset rule to obtain ion current electric field logarithm data comprises:
extracting the synthetic electric field data of each position according to a preset proportion, and performing weighted calculation on the synthetic electric field of each position according to a preset weight value corresponding to the position to obtain weighted synthetic electric field data;
judging the weighted synthesized electric field data according to a preset method, and rejecting abnormal data;
eliminating zero point errors, and averaging weighted composite electric field data of a plurality of positions measured each time to obtain processed composite electric field data;
and converting the processed synthetic electric field data to obtain ion current electric field data, and carrying out logarithmic conversion on the ion current electric field data to obtain ion current electric field logarithmic data.
4. The method of claim 3, wherein:
the preset method comprises a Grasbus criterion method, a Dixon criterion method and a ShowWiler criterion method;
and setting an abnormal frequency threshold, and discarding all weighted synthesized electric field data at any position when the abnormal frequency of the weighted synthesized electric field data corresponding to any position reaches the abnormal frequency threshold in a preset time period.
5. The method of claim 1, wherein: the calculation method of the surface field intensity comprises a finite element method, an analog charge method and a formula method.
6. The method of claim 1, wherein:
the onset field strength includes a surface field strength value corresponding to an intersection of the ambient interference level and the linear fit curve, and a surface field strength value corresponding to an intersection of the ambient interference level and the logarithmic fit curve.
7. The method of claim 1, wherein: the environment interference level is a straight line which is in the semi-logarithmic graph, has a constant intersection point with the ordinate and is parallel to the abscissa; the constant is the average value of the nominal electric field data in a semi-logarithmic coordinate before the ion current electric field is subjected to logarithmic transformation.
8. A halo determination system based on surface-synthesized electric field measurement data, the system comprising:
the data acquisition unit is used for acquiring the synthetic electric field data of a plurality of positions preset on the periphery of the line;
the data processing unit is used for analyzing and processing the synthesized electric field data according to a preset rule to obtain ion current electric field logarithmic data;
the surface field intensity calculation unit is used for calculating and obtaining the surface field intensity of the synthetic electric field data corresponding to each working condition;
the curve fitting unit is used for establishing a semilogarithmic coordinate system which takes surface field intensity as a horizontal coordinate and takes ion current electric field logarithmic data as a vertical coordinate, and obtaining a semilogarithmic line graph of a plurality of measuring points;
the curve fitting unit is used for performing curve fitting on the plurality of measuring points to obtain a fitting curve;
performing curve fitting on the plurality of measurement points to obtain a fitted curve, including:
calculating curve fitting demarcation points according to a preset rule;
performing linear fitting on a plurality of measuring points of which the abscissa is less than or equal to the abscissa of the dividing point;
carrying out logarithmic fitting on a plurality of measuring points of which the abscissa is greater than or equal to the abscissa of the dividing point;
the calculation formula of the curve fitting demarcation point is as follows:
wherein, E' i Logarithmic ion current and electric field values for the ith measurement point, E i The surface field intensity of the wire at the ith measuring point;
and the corona onset field intensity determining unit is used for determining the environmental interference level according to a preset rule and determining the corona onset field intensity through the intersection point of the environmental interference level and the fitting curve.
9. The system of claim 8, wherein: the data acquisition unit comprises an electric field sensor array, a data preprocessing module, an optical fiber data transmission module and an optical fiber data transceiving 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 synthesized electric field signals of respective positions;
the data preprocessing module is arranged at a position close to the corona cage and connected with the electric field sensor array; the data preprocessing module is used for performing analog-to-digital conversion on the original synthesized electric field signal to obtain synthesized electric field data;
one end of the optical fiber data transmission module is connected with the data preprocessing module, and the other end of the optical fiber data transmission module is connected with an optical fiber data receiving and transmitting module far away from the corona cage; the optical fiber data transmission module is used for transmitting the synthesized electric field data to the optical fiber data receiving and transmitting module through an optical fiber line;
and the optical fiber data transceiver module is used for being connected with the data processing unit and transmitting the synthesized electric field data to the data processing unit.
10. The system of claim 8, wherein:
the data processing unit is used for extracting the synthetic electric field data of each position according to a preset proportion, and carrying out weighted calculation on the synthetic 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 is used for judging the weighted synthesis electric field data according to a preset method and rejecting abnormal data;
the data processing unit is used for eliminating zero errors and averaging weighted composite electric field data of a plurality of positions measured each time to obtain processed composite electric field data;
and the data processing unit is used for converting the processed synthesized electric field data to obtain ion current electric field data and carrying out logarithmic conversion on the ion current electric field data to obtain ion current electric field logarithmic data.
11. The system of claim 10, wherein: the preset method comprises the following steps
The Labbs criterion method, the Dixon criterion method, and the ShowWiler criterion method;
the data processing unit is used for setting an abnormal frequency threshold, and when the abnormal frequency of the weighted combined electric field data corresponding to any position reaches the abnormal frequency threshold in a preset time period, all the weighted combined electric field data at any position are discarded.
12. The system of claim 8, wherein: the method for calculating the surface field intensity by the surface field intensity calculating unit comprises a finite element method, an analog charge method and a formula method.
13. The system of claim 8, wherein: the corona onset field strength comprises a surface field strength value corresponding to an intersection point of the environmental interference level and the linear fitting curve and a surface field strength value corresponding to an intersection point of the environmental interference level and the logarithmic fitting curve.
14. The system of claim 8, wherein: the environment interference level is a straight line which is in the semi-logarithmic graph, has a constant intersection point with the ordinate and is parallel to the abscissa; the constant is an average value of nominal electric field data under a semilogarithmic coordinate before the ion current electric field is subjected to logarithmic transformation.
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