CN117572102A - Insulator detection system and method based on space electric field sensing technology - Google Patents
Insulator detection system and method based on space electric field sensing technology Download PDFInfo
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- 239000012212 insulator Substances 0.000 title claims abstract description 336
- 230000005684 electric field Effects 0.000 title claims abstract description 169
- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000005516 engineering process Methods 0.000 title claims abstract description 15
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- 229910052573 porcelain Inorganic materials 0.000 description 5
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- 238000003745 diagnosis Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 229910000831 Steel Inorganic materials 0.000 description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
- G01R29/14—Measuring field distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- 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
- G01R31/1245—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 line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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Abstract
The invention discloses an insulator detection system and method based on a space electric field sensing technology, and belongs to the technical field of operation and maintenance of power transmission and transformation equipment. According to the invention, the remote control analysis platform is used for remotely controlling the non-contact insulator electrified detection device to measure the spatial electric field distribution data of the insulator string, and wireless communication is adopted to transmit the spatial electric field distribution data to the remote control analysis platform for judgment, so that the information of the low-resistance insulator in the insulator string is accurately given. The invention can realize the accurate measurement of the electric field distribution of the insulator string under the electrified working condition, and the analysis and the processing of data, thereby realizing the accurate identification of the low-resistance insulator in the insulator string. Thereby solving the technical problem of low accuracy existing in the existing electrified detection low-resistance insulator method.
Description
Technical Field
The invention relates to the technical field of operation and maintenance of power transmission and transformation equipment, in particular to an insulator detection system and method based on a space electric field sensing technology.
Background
There are a large number of series-connected insulation devices in the power grid, such as transmission line insulator strings, substation post insulators, large-scale insulation brackets, etc., and the common characteristic is that the high-resistance insulators realize high-voltage-class insulation through series connection. When one or more insulating parts are mechanically damaged or breakdown is caused by uneven distribution voltage, the insulating effect is lost, the problem of uneven overall distribution voltage is further aggravated, and even overall breakdown discharge is caused. The disc-shaped porcelain insulator is used as a most commonly used element of a high-voltage direct-current overhead transmission line, plays a role in electric insulation between a high-voltage wire and a pole tower, bears the action of gravity or tensile force of the wire, is influenced by a plurality of factors such as lightning, haze, dust emission, natural aging and the like, the insulation performance of the disc-shaped porcelain insulator is inevitably reduced, and the reliability of the disc-shaped porcelain insulator influences the safe and stable operation of a power grid. The degradation rate of the disc-shaped porcelain insulator gradually increases along with the increase of the operation period, and the degradation insulator is mainly characterized by significantly reduced insulation resistance and even low resistance. The main hazard of the low-resistance insulator is to reduce the flashover voltage of the insulator string, which may cause internal insulation breakdown and cause insulator explosion, thereby causing disconnection accident. Therefore, in order to prevent an accident caused by the defect of the deteriorated insulator to the safe operation of the power grid, the operation states of the ac/dc line and the insulator for the transformer substation need to be periodically detected.
At present, common detection methods for the degradation state of the insulator of the power grid at home and abroad comprise an insulation resistance method, a voltage distribution method, a leakage current method, an infrared thermal imaging method, an ultraviolet imaging method and the like, but the methods have the defects of high labor cost, high safety risk, large environmental impact, complex testing method, low accuracy and the like. Up to now, the research on the degradation characteristics of the low-resistance insulator lacks the research on the failure formation mechanism, the existing insulation state electrified detection technology is not perfect, and no evaluation method for the degradation state and characteristic parameters of the low-resistance insulator is established, so that the existing electrified detection of the low-resistance insulator of the AC/DC line and the transformer substation lacks an electrified detection and evaluation method with high efficiency and high accuracy. Therefore, a safer, reliable and efficient low-resistance insulator diagnosis and identification method is needed in the operation of the power grid in China at present.
The existing low-resistance insulator diagnosis and identification method comprises an infrared imaging method and a contact measurement detection method. The infrared imaging method is characterized in that different temperatures are generated according to different voltages on an insulator string, heat signals radiated by different temperatures are different, the infrared imager converts the signals into visible two-dimensional images through processing the signals received by the heat radiation, and the difference between the hot spot position and the ambient temperature is used as a thermal characteristic parameter of a detection object. After the insulator is subjected to insulation degradation or serious surface pollution, distribution voltage change and leakage current abnormality of the insulator string in operation can be caused, and signs of heating or local cooling appear, which is the basic principle of detecting the degraded insulator by an infrared imaging method. For example, the invention application CN106124949a discloses an on-line monitoring method for insulator faults based on a thermal infrared imaging technology, a rectangular frame point selection method is adopted in a steel cap part, a line segment point selection method is adopted in an insulator string part for coordinate temperature conversion, four temperature parameter characteristic quantities of low-value insulator characteristic quantity, zero-value insulator characteristic quantity, insulator pollution accumulation characteristic quantity and insulator breakage characteristic quantity are obtained through an insulator fault detection algorithm, and two three-layer PNN probability neural networks are selected to respectively perform characteristic level fusion on the steel cap part and the insulator string part in combination with environmental temperature, humidity and pollution conditions, a result of local information fusion judgment is given, and the result is submitted to a decision level for global decision. However, the infrared imaging method is not very different from the ambient temperature at the initial stage of defect discharge, infrared detection is not sensitive, and when a heat source higher than the defect discharge exists in the detection area, the infrared imaging device focuses high Wen Zhe, so that the defect position is difficult to judge. When the insulation resistance of the deteriorated insulator is 5-10MΩ, the temperature change is not obvious, the difference is difficult to distinguish through infrared thermal imaging, and a detection blind area exists. The method is greatly influenced by the environment, the interference of the sun and the background radiation, the selection of the spectrum emissivity epsilon, the focusing condition, the meteorological condition and the like can influence the detection result. Therefore, there are some limitations in practical applications.
The characteristic of reduced voltage is utilized to detect by reducing the insulation resistance of the deteriorated insulator, and the method belongs to contact measurement. For example, the method of manually climbing a pole tower such as a short-circuit fork, a spark gap discharging fork or an insulator string voltage analyzer can grasp the insulation condition by detecting the change of the insulator bearing voltage value. In a similar sensitive insulator method, when a string of insulators are all good insulators, the distribution voltage of each insulator is called a standard distribution voltage. When a deteriorated insulator exists in an insulator string, the distribution voltage of each insulator in the insulator string is different from the standard distribution voltage due to the serious drop of the voltage borne by the deteriorated insulator, and the positions of the deteriorated insulators in the insulator string are different and the degree of deterioration is different. For 110kV lines and 220kV lines, when the insulator deteriorates to some extent, there is always one or two insulators regardless of the position of the deteriorated insulator, even if the difference value is not always maximum, but is relatively large, and the insulators are most sensitive in combination, which is called a sensitive insulator. The voltage bearing of the sensitive insulator is measured and compared with the standard distribution voltage, and whether the deteriorated insulator exists in the string of insulators or not can be judged. When the degraded insulator exists at other positions, the distribution voltage of the sensitive insulator is increased; when the sensitive insulator itself is a deteriorated insulator, its distribution voltage decreases. According to this characteristic, the positions of the deteriorated insulators can be completely distinguished.
However, the traditional insulator detection method adopts more power supply units at present, but has the defects of high labor intensity, poor safety, low efficiency, electromagnetic interference and the like, and is easy to cause false detection or omission. Taking spark gap discharge detection as an example, the spark fork may cause an insulator string to flashover when the detected insulator is shorted at the moment of spark generation. In addition, for the ultra-long insulator string of 500kV and 750kV lines, even if the resistance value of a certain piece of insulator is reduced, the voltage distribution change is not large, and the detection by the method is difficult.
The method for detecting the sensitive insulator is similar to the voltage distribution method in essence, but only detects the voltage value of the sensitive insulator, and detects the sensitive insulator piece by piece when the voltage value of the sensitive insulator is judged to be deteriorated, so that the workload is reduced compared with the traditional voltage distribution method. The disadvantages of this method are: the contact measurement is still needed to be carried out by climbing the tower, the workload is larger than that of a non-contact method, the detection sensitivity is related to the insulation degradation degree of the insulator and the position of the degraded insulator in the whole insulator string, and the detection effect on the voltage class above 330kV is to be verified.
Therefore, the existing electrified detection low-resistance insulator method has the technical problems of low accuracy, high operation risk, high working strength, complex detection device and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an insulator detection system and method based on a space electric field sensing technology.
According to one aspect of the present invention, there is provided an insulator detection system based on a spatial electric field sensing technique, comprising: the insulator electrified detection device and the remote control analysis platform; wherein the method comprises the steps of
The insulator electrified measuring device comprises an electric field measuring module, a walking module, a balancing module and a main control module; the electric field measurement module is used for measuring the spatial electric field distribution data of the insulator string and sending the spatial electric field distribution data to the remote control analysis platform; the walking module is used for driving the insulator live measurement device to move on the insulator string; the balancing module is used for adjusting the balance of the insulator live measurement device in the moving process; the main control module is used for receiving a control instruction sent by the remote control analysis platform and controlling the electric field measurement module, the walking module and the balancing module according to the control instruction;
the remote control analysis platform comprises a control module and a data analysis module; the control module is used for sending a control instruction to the insulator electrified detection device and remotely controlling the movement, electric field measurement and data transmission of the insulator electrified detection device; the data analysis module is used for analyzing the spatial electric field distribution data measured by the insulator live measurement device and judging whether the insulator string contains an abnormal insulator with the resistance value lower than a preset threshold value or not according to the analysis result.
Optionally, the electric field measurement module comprises a circuit unit and an acquisition unit; the circuit unit is used for sensing the spatial electric field distribution parameters of the insulator string to the acquisition unit, and the acquisition unit is used for digitizing the spatial electric field distribution parameters to obtain the spatial electric field distribution data of the insulator string and then sending the spatial electric field distribution data to the remote control analysis platform.
Optionally, the electric field measurement module adopts an anti-electromagnetic shielding structure design.
Optionally, the insulator live measurement device further comprises a first power module, and the first power module is used for providing power for the insulator live measurement device.
Optionally, the remote control analysis platform further comprises a second power module, and the second power module is used for providing power for the remote control analysis platform.
Optionally, the analyzing the spatial electric field distribution data measured by the insulator live measurement device, and judging whether the insulator string contains an abnormal insulator with a resistance value lower than a preset threshold according to the analysis result, includes:
analyzing the spatial electric field distribution data measured by the insulator live measurement device by utilizing a filtering algorithm, determining the electric field distribution characteristics of the insulator string, and drawing an electric field distribution characteristic curve of the insulator string based on the electric field distribution characteristics;
external characteristic information of the insulator string is determined, wherein the external characteristic information comprises atmospheric environment parameters, a tower structure, a string type, an arrangement mode and a voltage level;
determining the electric field distortion degree of the insulator string based on a preset database, an electric field distribution characteristic curve of the insulator string and external characteristic information;
determining whether an abnormal insulator is contained in the insulator string according to the electric field distortion degree of the insulator string;
and under the condition that the insulator string contains an abnormal insulator, judging whether the resistance value of the abnormal insulator is lower than a preset threshold value.
According to another aspect of the present invention, there is provided an insulator detection method based on a spatial electric field sensing technology, including:
measuring the spatial electric field distribution data of the insulator string through an insulator live measuring device and sending the spatial electric field distribution data to a remote control analysis platform; the insulator electrified measuring device comprises an electric field measuring module, a walking module, a balancing module and a main control module; the electric field measurement module is used for measuring the spatial electric field distribution data of the insulator string and sending the spatial electric field distribution data to the remote control analysis platform; the walking module is used for driving the insulator live measurement device to move on the insulator string; the balancing module is used for adjusting the balance of the insulator live measurement device in the moving process; the main control module is used for receiving a control instruction sent by the remote control analysis platform and controlling the electric field measurement module, the walking module and the balancing module according to the control instruction;
analyzing the spatial electric field distribution data measured by the insulator live measurement device through a remote control analysis platform, and judging whether an abnormal insulator with a resistance value lower than a preset threshold value is contained in the insulator string according to an analysis result; the remote control analysis platform comprises a control module and a data analysis module; the control module is used for sending a control instruction to the insulator electrified detection device and remotely controlling the movement, electric field measurement and data transmission of the insulator electrified detection device; the data analysis module is used for analyzing the spatial electric field distribution data measured by the insulator live measurement device and judging whether the insulator string contains an abnormal insulator with the resistance value lower than a preset threshold value or not according to the analysis result.
Optionally, the electric field measurement module comprises a circuit unit and an acquisition unit; the circuit unit is used for sensing the spatial electric field distribution parameters of the insulator string to the acquisition unit, and the acquisition unit is used for digitizing the spatial electric field distribution parameters to obtain the spatial electric field distribution data of the insulator string and then sending the spatial electric field distribution data to the remote control analysis platform.
Optionally, the electric field measurement module adopts an anti-electromagnetic shielding structure design.
Optionally, the insulator live measurement device further comprises a first power module, and the first power module is used for providing power for the insulator live measurement device.
Optionally, the remote control analysis platform further comprises a second power module, and the second power module is used for providing power for the remote control analysis platform.
Optionally, the analyzing the spatial electric field distribution data measured by the insulator live measurement device, and judging whether the insulator string contains an abnormal insulator with a resistance value lower than a preset threshold according to the analysis result, includes:
analyzing the spatial electric field distribution data measured by the insulator live measurement device by utilizing a filtering algorithm, determining the electric field distribution characteristics of the insulator string, and drawing an electric field distribution characteristic curve of the insulator string based on the electric field distribution characteristics;
external characteristic information of the insulator string is determined, wherein the external characteristic information comprises atmospheric environment parameters, a tower structure, a string type, an arrangement mode and a voltage level;
determining the electric field distortion degree of the insulator string based on a preset database, an electric field distribution characteristic curve of the insulator string and external characteristic information;
determining whether an abnormal insulator is contained in the insulator string according to the electric field distortion degree of the insulator string;
and under the condition that the insulator string contains an abnormal insulator, judging whether the resistance value of the abnormal insulator is lower than a preset threshold value.
According to the invention, the remote control analysis platform is used for remotely controlling the non-contact insulator electrified detection device to measure the spatial electric field distribution data of the insulator string, and wireless communication is adopted to transmit the spatial electric field distribution data to the remote control analysis platform for judgment, so that the information of the low-resistance insulator in the insulator string is accurately given. The invention can realize the accurate measurement of the electric field distribution of the insulator string under the electrified working condition, and the analysis and the processing of data, thereby realizing the accurate identification of the low-resistance insulator in the insulator string. Thereby solving the technical problem of low accuracy existing in the existing electrified detection low-resistance insulator method.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
fig. 1 is a schematic structural view of an insulator electrification measuring device according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic diagram of a remote control analysis platform according to an exemplary embodiment of the present invention;
FIG. 3 is a schematic diagram of an electric field distribution curve of a normal insulator string according to an exemplary embodiment of the present invention;
fig. 4 is a schematic diagram of an electric field distribution curve of an insulator string with low resistance insulator according to an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present invention and not all embodiments of the present invention, and it should be understood that the present invention is not limited by the example embodiments described herein.
The invention provides an insulator detection system and method based on a space electric field sensing technology by taking a porcelain insulator as a research object, and provides a good method guidance for operation and maintenance diagnosis of insulator strings running in a power grid. After the achievement is converted and applied in the power grid of China, a safe, reliable, intelligent and efficient technical means is provided for detecting the low-resistance insulators of the ultra-high voltage direct-current transmission line and the convertor station, the zero-detection operation risk and intensity of operation and maintenance personnel are effectively reduced, considerable economic and social benefits are continuously generated, and the method has important significance for improving the operation and maintenance level of the power grid of China.
Fig. 1 is a schematic structural diagram of an insulator live measurement device according to an exemplary embodiment of the present invention, and fig. 2 is a schematic structural diagram of a remote control analysis platform according to an exemplary embodiment of the present invention. Referring to fig. 1 and 2, an insulator detection system based on a spatial electric field sensing technology includes: the insulator electrified detection device and the remote control analysis platform; the insulator electrified measuring device comprises an electric field measuring module, a walking module, a balancing module and a main control module; the electric field measurement module is used for measuring the spatial electric field distribution data of the insulator string and sending the spatial electric field distribution data to the remote control analysis platform; the walking module is used for driving the insulator live measurement device to move on the insulator string; the balancing module is used for adjusting the balance of the insulator live measurement device in the moving process; the main control module is used for receiving a control instruction sent by the remote control analysis platform and controlling the electric field measurement module, the walking module and the balancing module according to the control instruction; the remote control analysis platform comprises a control module and a data analysis module; the control module is used for sending a control instruction to the insulator electrified detection device and remotely controlling the movement, electric field measurement and data transmission of the insulator electrified detection device; the data analysis module is used for analyzing the spatial electric field distribution data measured by the insulator live measurement device and judging whether the insulator string contains an abnormal insulator with the resistance value lower than a preset threshold value or not according to the analysis result.
Optionally, the electric field measurement module comprises a circuit unit and an acquisition unit; the circuit unit is used for sensing the spatial electric field distribution parameters of the insulator string to the acquisition unit, and the acquisition unit is used for digitizing the spatial electric field distribution parameters to obtain the spatial electric field distribution data of the insulator string and then sending the spatial electric field distribution data to the remote control analysis platform.
Optionally, the electric field measurement module adopts an anti-electromagnetic shielding structure design.
Optionally, the insulator live measurement device further comprises a first power module, and the first power module is used for providing power for the insulator live measurement device.
Optionally, the remote control analysis platform further comprises a second power module, and the second power module is used for providing power for the remote control analysis platform.
In the embodiment of the invention, the system mainly comprises the insulator live detection device and the remote control analysis platform, and can realize accurate measurement of insulator string electric field distribution under a live working condition and analysis and processing of data.
As shown in fig. 1, the insulator live measurement device is composed of an electric field measurement module, a walking module, a balancing module, a main control module and a first power module. The electric field measurement module adopts an anti-electromagnetic shielding structure design, and senses the spatial electric field distribution parameters of the insulator string through the circuit unit, and finally digitizes the spatial electric field distribution parameters through the acquisition unit to realize checking, displaying and analyzing; the walking module and the balancing module adopt motors to drive crawler belts to drive the charged detection devices to walk, so that the charged detection devices stably move on the surface of the insulator string; the main function of the walking module is to drive the insulator live measuring device to move on the insulator string; in the moving process, the insulator live measurement device can be influenced by various factors (such as wind force, insulator string radian and the like), the situation that the insulator live measurement device swings too much in the moving process possibly occurs, and the balance module is mainly used for adjusting the balance of the insulator live measurement device in the moving process so that the insulator live measurement device stably moves in the moving process. The main control module has the functions of receiving signals, wirelessly transmitting signals and controlling the traveling module, and realizes the functions of receiving signals of the electrified device, transmitting the signals and controlling the traveling module to move on the surface of the insulator string; the first power module is used for providing power for the electrified detection device.
As shown in fig. 2, the remote control and analysis platform is composed of a control module, a data analysis module and a second power module. The control module can remotely send a control instruction to the insulator live detection device, remotely control the movement of the insulator live detection device, electric field measurement and data transmission, and realize the wireless transmission functions of the movement of the live detection device on the insulator string, the accurate measurement of the electric field and the measurement data; the data analysis module analyzes the electric field data measured by the electrified detection device, analyzes electric field distribution characteristics by utilizing a filtering algorithm, draws an electric field distribution characteristic curve and judges the low-resistance insulator. The second power module provides power support for the remote control analysis platform.
Optionally, the analyzing the spatial electric field distribution data measured by the insulator live measurement device, and judging whether the insulator string contains an abnormal insulator with a resistance value lower than a preset threshold according to the analysis result, includes: analyzing the spatial electric field distribution data measured by the insulator live measurement device by utilizing a filtering algorithm, determining the electric field distribution characteristics of the insulator string, and drawing an electric field distribution characteristic curve of the insulator string based on the electric field distribution characteristics; external characteristic information of the insulator string is determined, wherein the external characteristic information comprises atmospheric environment parameters, a tower structure, a string type, an arrangement mode and a voltage level; determining the electric field distortion degree of the insulator string based on a preset database, an electric field distribution characteristic curve of the insulator string and external characteristic information; determining whether an abnormal insulator is contained in the insulator string according to the electric field distortion degree of the insulator string; and under the condition that the insulator string contains an abnormal insulator, judging whether the resistance value of the abnormal insulator is lower than a preset threshold value.
In the embodiment of the invention, the insulator with the resistance value lower than 500M ohm or 300M ohm belongs to a low-resistance insulator (different voltage grades are slightly different, the resistance of more than 500kV is lower than 500M ohm and belongs to low resistance, and the resistance of less than 330kV is lower than 300M ohm and belongs to low resistance). The system measures the space electric field of the insulator string, and the steps comprise original data acquisition, data processing, algorithm analysis and judgment results. The original data acquisition is that an electrified detection device acquires induction signals around a single insulator and information such as temperature, humidity and the like of the atmospheric environment of the site where the insulator string is operated; the data processing is to filter the collected signals, namely to exclude interference signals, to reserve effective signals, and to draw the effective signals into an electric field distribution characteristic curve; the algorithm analysis is to compare and analyze the measured electric field distribution characteristic curve with the information such as atmospheric environment parameters, tower structure, string type, arrangement mode, voltage level and the like and the characteristic curve in the database according to the database established in the earlier stage, analyze the electric field distortion degree of the electric field distribution characteristic curve, and compare the electric field distortion degree to obtain an abnormal insulator; the judgment result is to analyze according to an algorithm to obtain abnormal insulator points and judge whether the abnormal insulator points are low-resistance insulators or not.
Fig. 3 is a schematic diagram of an electric field distribution curve of a normal insulator string according to an exemplary embodiment of the present invention, and fig. 4 is a schematic diagram of an electric field distribution curve of an insulator string including a low-resistance insulator according to an exemplary embodiment of the present invention.
In addition, the electromagnetic shielding resistant structure is composed of a plurality of layers of shielding materials, and is formed by Al5083 aluminum magnesium alloy, permalloy and silicon steel in sequence from inside to outside, insulating paper is used for isolating the three materials, and all splicing parts are attached by copper foil. The shielding body box cover is a part of an anti-electromagnetic shielding structure and is composed of AL5083 aluminum magnesium alloy, permalloy and silicon steel, insulating paper is used for isolating the shielding body box cover, the screws are necessarily metal screws, the screw hole spacing is not more than 40mm, and after the box cover is assembled, copper foil is used for attaching the periphery of the box cover to cover the screws. The shield inlet wire department, for shielding effect, the pencil can not directly enter into the shielding main part in, can cause the shielding to reveal, uses the connector that takes shielding function here to carry out the switching.
The invention also provides an insulator detection method based on the space electric field sensing technology, which comprises the following steps: measuring the spatial electric field distribution data of the insulator string through an insulator live measuring device and sending the spatial electric field distribution data to a remote control analysis platform; the insulator electrified measuring device comprises an electric field measuring module, a walking module, a balancing module and a main control module; the electric field measurement module is used for measuring the spatial electric field distribution data of the insulator string and sending the spatial electric field distribution data to the remote control analysis platform; the walking module is used for driving the insulator live measurement device to move on the insulator string; the balancing module is used for adjusting the balance of the insulator live measurement device in the moving process; the main control module is used for receiving a control instruction sent by the remote control analysis platform and controlling the electric field measurement module, the walking module and the balancing module according to the control instruction; analyzing the spatial electric field distribution data measured by the insulator live measurement device through a remote control analysis platform, and judging whether an abnormal insulator with a resistance value lower than a preset threshold value is contained in the insulator string according to an analysis result; the remote control analysis platform comprises a control module and a data analysis module; the control module is used for sending a control instruction to the insulator electrified detection device and remotely controlling the movement, electric field measurement and data transmission of the insulator electrified detection device; the data analysis module is used for analyzing the spatial electric field distribution data measured by the insulator live measurement device and judging whether the insulator string contains an abnormal insulator with the resistance value lower than a preset threshold value or not according to the analysis result.
The insulator detection method based on the space electric field sensing technology corresponds to an insulator detection system based on the space electric field sensing technology, and is not described herein.
The insulator live measurement device adopts a reliable electromagnetic field resistance shielding structure design, and realizes accurate measurement of electric field distribution of insulator strings under a strong electromagnetic field by the live detection device. The insulator live measurement device is based on a walking module, a balancing module and a main control module to realize a falling prevention structure, so that the insulator live measurement device can stably move on an insulator string when crawling on the insulator string, and cannot fall under external interference, so that stable crawling on the insulator string is realized. The remote control analysis platform adopts a wireless communication mode to carry out signal transmission with the insulator live measurement device, so that long-distance wireless control is realized, complicated wiring is avoided, and the remote control analysis platform is convenient and quick. The remote control analysis platform establishes the low-resistance subspace electric field distribution characteristics and the low-resistance insulator judgment algorithm based on a large number of experiments and simulations, and realizes the accurate identification of the low-resistance insulator in the insulator string.
It should be noted that the invention is mainly aimed at live measurement of insulator strings, and determines low-resistance insulators in the insulator strings according to measurement results, and can analyze degradation states of composite insulators. The invention adopts a non-contact insulator chain electric field distribution measuring method to be photoelectric sensing, and can be also used in the electric field sensor measurement of a capacitance flat plate, and the high-precision space electric field measuring method is in the protection range of the scheme.
In summary, the remote control analysis platform is used for remotely controlling the non-contact insulator electrified detection device to measure the spatial electric field distribution data of the insulator string, and wireless communication is adopted to transmit the spatial electric field distribution data to the remote control analysis platform for judgment, so that the information of the low-resistance insulator in the insulator string is accurately given. The invention can realize the accurate measurement of the electric field distribution of the insulator string under the electrified working condition, and the analysis and the processing of data, thereby realizing the accurate identification of the low-resistance insulator in the insulator string. Thereby solving the technical problem of low accuracy existing in the existing electrified detection low-resistance insulator method.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the invention to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (12)
1. An insulator detection system based on a space electric field sensing technology, which is characterized by comprising: the insulator electrified detection device and the remote control analysis platform; wherein the method comprises the steps of
The insulator electrified measuring device comprises an electric field measuring module, a walking module, a balancing module and a main control module; the electric field measurement module is used for measuring the spatial electric field distribution data of the insulator string and sending the spatial electric field distribution data to the remote control analysis platform; the walking module is used for driving the insulator live measurement device to move on the insulator string; the balancing module is used for adjusting the balance of the insulator live measurement device in the moving process; the main control module is used for receiving a control instruction sent by the remote control analysis platform and controlling the electric field measurement module, the walking module and the balancing module according to the control instruction;
the remote control analysis platform comprises a control module and a data analysis module; the control module is used for sending a control instruction to the insulator electrified detection device and remotely controlling the movement, electric field measurement and data transmission of the insulator electrified detection device; the data analysis module is used for analyzing the spatial electric field distribution data measured by the insulator live measurement device and judging whether the insulator string contains an abnormal insulator with the resistance value lower than a preset threshold value or not according to the analysis result.
2. The system of claim 1, wherein the electric field measurement module comprises a circuit unit and an acquisition unit; the circuit unit is used for sensing the spatial electric field distribution parameters of the insulator string to the acquisition unit, and the acquisition unit is used for digitizing the spatial electric field distribution parameters to obtain the spatial electric field distribution data of the insulator string and then sending the spatial electric field distribution data to the remote control analysis platform.
3. The system of claim 1, wherein the electric field measurement module is configured with an anti-electromagnetic shielding structure.
4. The system of claim 1, wherein the insulator live measurement device further comprises a first power module for providing power to the insulator live measurement device.
5. The system of claim 1, wherein the remote control analysis platform further comprises a second power module for providing power to the remote control analysis platform.
6. The system of claim 1, wherein the analyzing the spatial electric field distribution data measured by the insulator live measuring device and determining whether the insulator string contains an abnormal insulator with a resistance value lower than a preset threshold value according to the analysis result comprises:
analyzing the spatial electric field distribution data measured by the insulator live measurement device by utilizing a filtering algorithm, determining the electric field distribution characteristics of the insulator string, and drawing an electric field distribution characteristic curve of the insulator string based on the electric field distribution characteristics;
external characteristic information of the insulator string is determined, wherein the external characteristic information comprises atmospheric environment parameters, a tower structure, a string type, an arrangement mode and a voltage level;
determining the electric field distortion degree of the insulator string based on a preset database, an electric field distribution characteristic curve of the insulator string and external characteristic information;
determining whether an abnormal insulator is contained in the insulator string according to the electric field distortion degree of the insulator string;
and under the condition that the insulator string contains an abnormal insulator, judging whether the resistance value of the abnormal insulator is lower than a preset threshold value.
7. The insulator detection method based on the space electric field sensing technology is characterized by comprising the following steps of:
measuring the spatial electric field distribution data of the insulator string through an insulator live measuring device and sending the spatial electric field distribution data to a remote control analysis platform; the insulator electrified measuring device comprises an electric field measuring module, a walking module, a balancing module and a main control module; the electric field measurement module is used for measuring the spatial electric field distribution data of the insulator string and sending the spatial electric field distribution data to the remote control analysis platform; the walking module is used for driving the insulator live measurement device to move on the insulator string; the balancing module is used for adjusting the balance of the insulator live measurement device in the moving process; the main control module is used for receiving a control instruction sent by the remote control analysis platform and controlling the electric field measurement module, the walking module and the balancing module according to the control instruction;
analyzing the spatial electric field distribution data measured by the insulator live measurement device through a remote control analysis platform, and judging whether an abnormal insulator with a resistance value lower than a preset threshold value is contained in the insulator string according to an analysis result; the remote control analysis platform comprises a control module and a data analysis module; the control module is used for sending a control instruction to the insulator electrified detection device and remotely controlling the movement, electric field measurement and data transmission of the insulator electrified detection device; the data analysis module is used for analyzing the spatial electric field distribution data measured by the insulator live measurement device and judging whether the insulator string contains an abnormal insulator with the resistance value lower than a preset threshold value or not according to the analysis result.
8. The method of claim 7, wherein the electric field measurement module comprises a circuit unit and an acquisition unit; the circuit unit is used for sensing the spatial electric field distribution parameters of the insulator string to the acquisition unit, and the acquisition unit is used for digitizing the spatial electric field distribution parameters to obtain the spatial electric field distribution data of the insulator string and then sending the spatial electric field distribution data to the remote control analysis platform.
9. The method of claim 7, wherein the electric field measurement module is designed with an anti-electromagnetic shielding structure.
10. The method of claim 7, wherein the insulator live measurement device further comprises a first power module for providing power to the insulator live measurement device.
11. The method of claim 7, wherein the remote operated analysis platform further comprises a second power module for providing power to the remote operated analysis platform.
12. The method of claim 7, wherein analyzing the spatial electric field distribution data measured by the insulator live measuring device and determining whether the insulator string contains an abnormal insulator with a resistance value lower than a preset threshold value according to the analysis result comprises:
analyzing the spatial electric field distribution data measured by the insulator live measurement device by utilizing a filtering algorithm, determining the electric field distribution characteristics of the insulator string, and drawing an electric field distribution characteristic curve of the insulator string based on the electric field distribution characteristics;
external characteristic information of the insulator string is determined, wherein the external characteristic information comprises atmospheric environment parameters, a tower structure, a string type, an arrangement mode and a voltage level;
determining the electric field distortion degree of the insulator string based on a preset database, an electric field distribution characteristic curve of the insulator string and external characteristic information;
determining whether an abnormal insulator is contained in the insulator string according to the electric field distortion degree of the insulator string;
and under the condition that the insulator string contains an abnormal insulator, judging whether the resistance value of the abnormal insulator is lower than a preset threshold value.
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