Method and system for calculating surface potential of direct-current wall bushing under high temperature and high airflow

Abstract

The invention discloses a direct-current wall bushing surface potential calculation method and system under high temperature and high airflow, and the method comprises the steps: calibrating a rotary passive electrostatic measurement instrument, and obtaining the electric field data of the rotary passive electrostatic measurement instrument under the condition of known potential through the calibrated rotary passive electrostatic measurement instrument; analyzing a mapping relation between the electric field data and the potential data to obtain a mathematical function expression for the electric field data and the potential data of an actual site; simulating a high-temperature and high-airflow environment based on preset environment parameters; the calibrated rotary passive electrostatic measurement device is used for measuring the surface electric field of the real-type direct-current wall bushing, and surface electric field data of the real-type direct-current wall bushing under different temperatures, different wind speeds and the combined action of the temperatures and the wind speeds are obtained; and determining potential data of the direct-current wall bushing under high temperature and high airflow by applying a mathematical function expression based on the surface electric field data of the real-type direct-current wall bushing.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment surface potential measurement, and more specifically, to a method and system for calculating the surface potential of a DC wall bushing under high temperature and high airflow. Background Art

[0002] my country's energy resources and energy consumption centers are inversely distributed, with more in the west and less in the east, and more in the north and less in the south. This imbalance is evident. To address this, efforts have been made to vigorously develop ultra-high voltage (UHV) transmission technology. Due to its significant advantages, such as large capacity, long distances, low losses, and reduced land use, it has been widely used in UHVDC transmission projects, back-to-back flexible DC projects, and offshore renewable energy access projects. UHVDC converter stations have been built in Xinjiang, Inner Mongolia, and Tibet. The equipment within these stations operates in harsh natural environments, particularly the wall bushings, which are subject to high temperatures, high humidity, and strong winds and sandstorms. DC wall bushings are installed on the walls of converter station valve halls, connecting equipment inside and outside the valve halls. They are essential channels for DC power transmission and serve as key equipment. Statistics show that DC wall bushings in converter stations both domestically and internationally primarily come in two types: pure SF6 gas-insulated and resin-impregnated paper capacitor structures. Both utilize composite silicone rubber sheds. Due to the structural characteristics of the wall bushing itself and the long-term operation under unipolar DC conditions, the surface potential distribution of the DC wall bushing is uneven. Under the action of the uneven synthetic electric field in space, a large amount of charge will accumulate on the surface of the shed, that is, a large amount of surface charge will accumulate at the interface between the shed and the air. If there are tiny defects or weak points in the bushing insulation components, the local electric field of the shed will be distorted, and the field strength it withstands will exceed the design value, eventually causing discharge breakdown failure, which seriously threatens the reliability and safety of the long-term operation of the bushing.

[0003] Active electrostatic probes are currently widely used to measure the surface potential of spherical insulators. Studies have shown that applying a DC voltage to 220 kV gas-insulated metal-enclosed transmission line spherical insulators, regardless of whether the voltage is positive or negative, results in significant charge accumulation. These studies primarily focus on the charge distribution characteristics of spherical insulators, and the measurement methods are not suitable for bushings, as the sheds of DC through-the-wall bushings have different shapes, varying in size from those of spherical insulators. Foreign researchers have proposed using a rotating passive electrostatic measuring instrument to measure the electric field of the sheds of DC bushings, but this method is unable to calculate the surface potential of the bushing.

[0004] Therefore, especially when measuring the surface electric field of the DC wall bushing under high temperature and high airflow, the surface potential distribution of the bushing is calculated, which is of great significance for studying the surface charge distribution and electrical performance of the DC wall bushing in high temperature and high airflow environment. Summary of the Invention

[0005] The technical solution of the present invention provides a method system for calculating the surface potential of a DC wall bushing under high temperature and high airflow, so as to solve the problem of how to measure the surface potential of the composite outer jacket of the DC wall bushing.

[0006] In order to solve the above problems, the present invention provides a method for calculating the surface potential of a DC wall bushing under high temperature and high airflow conditions, the method comprising:

[0007] Calibrate the rotating passive electrostatic measuring instrument, and obtain electric field data of the rotating passive electrostatic measuring instrument under a known potential through the calibrated rotating passive electrostatic measuring instrument;

[0008] Analyze the mapping relationship between electric field data and potential data to obtain mathematical function expressions of electric field data and potential data for actual field use;

[0009] Based on preset environmental parameters, a high-temperature, high-airflow environment was simulated. A calibrated rotary passive electrostatic measurement device was used to measure the surface electric field of a real DC wall bushing. Surface electric field data for the real DC wall bushing was obtained at different temperatures, wind speeds, and the combined effects of temperature and wind speed.

[0010] Based on the surface electric field data of the real DC wall bushing, the potential data of the DC wall bushing under high temperature and high airflow is determined by applying the mathematical function expression.

[0011] Preferably, it also includes building a rotary passive electrostatic measuring instrument calibration system, the rotary passive electrostatic measuring instrument calibration system includes: a high voltage input end, a support, a metal cylinder, an upper rotary passive electrostatic measuring instrument, a frame, a right rotary passive electrostatic measuring instrument, a left rotary passive electrostatic measuring instrument, and a lower rotary passive electrostatic measuring instrument;

[0012] The metal cylinder is made of conductive material and is used to simulate a DC wall bushing. The diameter of the metal cylinder is equal to the diameter Ds of the DC wall bushing, and the length of the metal cylinder is at least twice the diameter Ds.

[0013] The support is connected to the metal cylinder and the high voltage input end and is made of conductive material;

[0014] The frame is made of epoxy insulating material and is used to fix the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument to the edge of the frame respectively; the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument are at a preset distance L from the metal cylinder;

[0015] The square frame can rotate 360 ​​degrees along the radial direction of the metal cylinder and move horizontally along the axial direction of the metal cylinder.

[0016] Preferably, based on preset environmental parameters, a high temperature and high airflow environment is simulated; a calibrated rotary passive electrostatic measurement device is used to measure the surface electric field of a real DC wall bushing, and the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed are obtained, including:

[0017] Applying different voltage values ​​and voltages of different polarities to the rotary passive electrostatic measuring instrument calibration system by a DC voltage source according to a preset step length, and maintaining the applied voltage values ​​of different levels for a preset time;

[0018] Obtain the electric field measurement values ​​generated by the simulated DC wall bushing measured by the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument at each voltage value, and determine the electric field data at each voltage value based on the electric field measurement values.

[0019] Preferably, analyzing the mapping relationship between the electric field data and the potential data to obtain a mathematical function expression of the electric field data and the potential data that can be used in an actual field includes:

[0020] Obtaining potential data of the simulated DC wall bushing at each voltage value;

[0021] By fitting the electric field data and potential data in different scenarios, the mapping relationship between the electric field data and the potential data is determined, and the mathematical function expressions of the electric field data and the potential data that can be used in actual scenes are obtained.

[0022] Preferably, it also includes building a rotating passive electrostatic measuring device, which includes a metal support frame, a DC wall bushing, a metal peak nest, a heating net, a fan and a blower;

[0023] The metal support frame is used to support the DC wall bushing, so that the distance between the rotary passive electrostatic measuring instruments arranged in four directions and the composite jacket large shed of the DC wall bushing is a preset distance L;

[0024] The fan blows air in a directional and uniform manner toward the DC wall bushing through the metal honeycomb and the heating net;

[0025] The heating network is used to heat the wind blown out by the fan.

[0026] Preferably, based on preset environmental parameters, a high temperature and high airflow environment is simulated; a calibrated rotary passive electrostatic measurement device is used to measure the surface electric field of a real DC wall bushing, and the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed are obtained, including:

[0027] Starting the fan and the heating network to generate environmental scenes with different wind speeds and temperatures;

[0028] A voltage is applied to the DC wall bushing to obtain electric field data generated by the DC wall bushing at a preset wind speed and a preset temperature.

[0029] Preferably, it also includes:

[0030] Applying a voltage to the DC wall bushing to obtain electric field data generated by the DC wall bushing at multiple preset wind speeds, multiple preset temperatures, and multiple wind directions;

[0031] By applying the mathematical function expression, the potential data of the DC wall bushing under high temperature and high airflow is determined.

[0032] According to another aspect of the present invention, a system for calculating the surface potential of a DC wall bushing under high temperature and high airflow conditions is provided, the system comprising:

[0033] The initialization unit is used to calibrate the rotary passive electrostatic measuring instrument and obtain the electric field data of the rotary passive electrostatic measuring instrument under a known potential through the calibrated rotary passive electrostatic measuring instrument. The fitting unit is used to analyze the mapping relationship between the electric field data and the potential data to obtain the mathematical function expression of the electric field data and the potential data for actual field use. The acquisition unit is used to simulate a high-temperature and high-airflow environment based on preset environmental parameters. The calibrated rotary passive electrostatic measuring device is used to measure the surface electric field of a real DC wall bushing to obtain the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed.

[0034] The result unit is used to determine the potential data of the DC wall bushing under high temperature and high airflow by applying the mathematical function expression based on the surface electric field data of the real DC wall bushing.

[0035] Preferably, the initial unit is also used to build a rotary passive electrostatic measuring instrument calibration system, which includes: a high-voltage input terminal, a support, a metal cylinder, an upper rotary passive electrostatic measuring instrument, a frame, a right-hand rotary passive electrostatic measuring instrument, a left-hand rotary passive electrostatic measuring instrument, and a lower rotary passive electrostatic measuring instrument;

[0036] The metal cylinder is made of conductive material and is used to simulate a DC wall bushing. The diameter of the metal cylinder is equal to the diameter Ds of the DC wall bushing, and the length of the metal cylinder is at least twice the diameter Ds.

[0037] The support is connected to the metal cylinder and the high voltage input end and is made of conductive material;

[0038] The frame is made of epoxy insulating material and is used to fix the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument to the edge of the frame respectively; the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument are at a preset distance L from the metal cylinder;

[0039] The square frame can rotate 360 ​​degrees along the radial direction of the metal cylinder and move horizontally along the axial direction of the metal cylinder.

[0040] Preferably, the initialization unit is configured to simulate a high-temperature and high-airflow environment based on preset environmental parameters; use a calibrated rotary passive electrostatic measurement device to measure the surface electric field of a real DC wall bushing, and obtain surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed; and further configured to:

[0041] Applying different voltage values ​​and voltages of different polarities to the rotary passive electrostatic measuring instrument calibration system by a DC voltage source according to a preset step length, and maintaining the applied voltage values ​​of different levels for a preset time;

[0042] Obtain the electric field measurement values ​​generated by the simulated DC wall bushing measured by the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument at each voltage value, and determine the electric field data at each voltage value based on the electric field measurement values.

[0043] Preferably, the fitting unit is used to analyze the mapping relationship between the electric field data and the potential data to obtain a mathematical function expression of the electric field data and the potential data that can be used in an actual field, and is also used to:

[0044] Obtaining potential data of the simulated DC wall bushing at each voltage value;

[0045] By fitting the electric field data and potential data in different scenarios, the mapping relationship between the electric field data and the potential data is determined, and the mathematical function expression of the electric field data and the potential data that can be used in the actual field is obtained.

[0046] Preferably, the acquisition unit is further used to build a rotary passive electrostatic measuring device, which includes a metal support frame, a DC wall bushing, a metal peak nest, a heating net, a fan and a blower;

[0047] The metal support frame is used to support the DC wall bushing, so that the distance between the rotary passive electrostatic measuring instruments arranged in four directions and the composite jacket large shed of the DC wall bushing is a preset distance L;

[0048] The fan blows air in a directional and uniform manner toward the DC wall bushing through the metal honeycomb and the heating net;

[0049] The heating network is used to heat the wind blown out by the fan.

[0050] Preferably, the acquisition unit is configured to simulate a high-temperature and high-airflow environment based on preset environmental parameters; use a calibrated rotary passive electrostatic measurement device to measure the surface electric field of a real DC wall bushing, and obtain surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed; and further configured to:

[0051] Starting the fan and the heating network to generate environmental scenes with different wind speeds and temperatures;

[0052] A voltage is applied to the DC wall bushing to obtain electric field data generated by the DC wall bushing at a preset wind speed and a preset temperature.

[0053] Preferably, the acquiring unit is further configured to:

[0054] Applying a voltage to the DC wall bushing to obtain electric field data generated by the DC wall bushing at multiple preset wind speeds, multiple preset temperatures, and multiple wind directions;

[0055] By applying the mathematical function expression, the potential data of the DC wall bushing under high temperature and high airflow is determined.

[0056] Based on another aspect of the present invention, the present invention provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and the computer program is used to execute a method for calculating the surface potential of a DC wall bushing under high temperature and high airflow.

[0057] According to another aspect of the present invention, the present invention provides an electronic device, characterized in that the electronic device includes: a processor and a memory; wherein,

[0058] The memory is a memory for storing instructions executable by the processor;

[0059] The processor is configured to read the executable instructions from the memory and execute the instructions to implement a method for calculating the surface potential of a DC wall bushing under high temperature and high airflow.

[0060] The technical solution of the present invention provides a method and system for calculating the surface potential of a DC wall bushing under high temperature and high airflow. The method includes: calibrating a rotary passive electrostatic measuring instrument, and obtaining electric field data of the rotary passive electrostatic measuring instrument under a known potential through the calibrated rotary passive electrostatic measuring instrument; analyzing a mapping relationship between the electric field data and the potential data to obtain a mathematical function expression for the electric field data and the potential data for actual field use; simulating a high temperature and high airflow environment based on preset environmental parameters; using the calibrated rotary passive electrostatic measuring device to measure the surface electric field of a real DC wall bushing, and obtaining surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined action of temperature and wind speed; and determining the potential data of the DC wall bushing under high temperature and high airflow by applying the mathematical function expression based on the surface electric field data of the real DC wall bushing. The technical solution of the present invention proposes a method and system for calculating the surface potential of the composite jacket of a DC wall bushing. By building a rotary passive electrostatic measuring instrument calibration system, different polarities and different voltage values ​​are applied to the calibration cylinder, and the corresponding relationship between the electric field measurement value and the applied voltage value of the rotary passive electrostatic instrument at a distance of L is obtained. The mapping relationship between the electric field strength measurement result and the surface potential of the conductor is obtained using a mathematical fitting formula. Based on this, the surface potential of the bushing is accurately reflected. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0062] Figure 1 This is a flow chart of a method for calculating the surface potential of a DC wall bushing under high temperature and high airflow according to a preferred embodiment of the present invention;

[0063] Figure 2 The figure is a flow chart of calculating the surface potential of the composite casing of the casing according to a preferred embodiment of the present invention.

[0064] Figure 3 A diagram showing the arrangement and composition of a calibration system for a rotary passive electrostatic measuring instrument according to a preferred embodiment of the present invention;

[0065] Figure 4 A schematic diagram of the arrangement and composition of a rotary passive electrostatic measuring instrument calibration system according to a preferred embodiment of the present invention;

[0066] Figure 5 Schematic diagram of the arrangement and structure of a device for measuring the surface electric field of a DC wall bushing in a high-temperature and high-airflow environment according to a preferred embodiment of the present invention;

[0067] Figure 6 is a schematic diagram of a fitting curve of the measured value and the applied voltage value of the rotary passive electrostatic measuring instrument according to a preferred embodiment of the present invention in a two-dimensional coordinate system; and

[0068] Figure 7 This is a structural diagram of a system for calculating the surface potential of a DC wall bushing under high temperature and high airflow according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0069] 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. These embodiments are provided to provide a thorough 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 shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0070] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0071] Figure 1 The present invention is a flowchart of a method for calculating the surface potential of a DC wall bushing under high temperature and high airflow according to a preferred embodiment of the present invention.

[0072] The present invention provides a device for measuring the electric field on the surface of a composite jacket of a DC wall bushing in a high-temperature and high-airflow environment. By calibrating the electric field measuring device, a method for calculating the surface potential of the composite jacket of the bushing is proposed. The specific purposes are as follows:

[0073] (1) The present invention builds a high-temperature and high-airflow simulation environment to carry out experiments on the influence of a single airflow velocity or airflow direction, temperature and airflow velocity and direction on the surface electric field of the composite jacket of the DC wall bushing based on a rotary passive electrostatic measuring instrument, and obtains the variation law of the surface electric field of the composite jacket of the DC wall bushing under the combined action of a single factor and multiple factors.

[0074] (2) The present invention proposes a method for calculating the surface potential of the composite jacket of the bushing. By building a rotary passive electrostatic measuring instrument calibration system, the mapping relationship between the electric field strength measurement results and the conductor surface potential is obtained based on the mathematical fitting formula, thereby accurately reflecting the surface potential of the bushing.

[0075] The present invention provides a device for measuring the electric field on the surface of a composite outer jacket of a wall bushing under a high-temperature and high-airflow environment and a method for calculating the potential. A calibration system is established with reference to the size of the large shed of the composite outer insulation of a DC wall bushing to obtain a fitting relationship between the measured electric field and the potential of a rotary passive electrostatic instrument. The calibrated rotary passive electrostatic instrument is used to carry out a surface electric field measurement test of a DC wall bushing under high-temperature and high-airflow conditions. The flow chart for calculating the surface potential of the composite outer jacket of the bushing is shown in FIG. Figure 2 As shown in the figure, the flow chart of DC wall bushing surface electric field measurement in high temperature and high airflow environment is as follows Figure 3 shown.

[0076] The present invention provides a method for calculating the surface potential of a DC wall bushing under high temperature and high airflow conditions, the method comprising:

[0077] Step 101: calibrating the rotary passive electrostatic measuring instrument, and obtaining electric field data of the rotary passive electrostatic measuring instrument under a known potential through the calibrated rotary passive electrostatic measuring instrument; preferably, the step further includes building a rotary passive electrostatic measuring instrument calibration system, the rotary passive electrostatic measuring instrument calibration system including: a high-voltage input terminal, a support, a metal cylinder, an upward rotary passive electrostatic measuring instrument, a frame, a rightward rotary passive electrostatic measuring instrument, a leftward rotary passive electrostatic measuring instrument, and a downward rotary passive electrostatic measuring instrument;

[0078] The metal cylinder is made of conductive material and is used to simulate the DC wall bushing. The diameter of the metal cylinder is equal to the diameter Ds of the DC wall bushing, and the length of the metal cylinder is at least twice the diameter Ds.

[0079] The support is connected to the metal cylinder and the high voltage input end and is made of conductive material;

[0080] The frame is made of epoxy insulating material and is used to fix the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument to the edge of the frame respectively; the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument are at a preset distance L from the metal cylinder;

[0081] The frame can rotate 360 ​​degrees along the radial direction of the metal cylinder and move horizontally along the axial direction of the metal cylinder.

[0082] Preferably, based on preset environmental parameters, a high temperature and high airflow environment is simulated, and the calibrated rotary passive electrostatic measurement device is used to measure the surface electric field of a real DC wall bushing. The surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed are obtained, including:

[0083] Applying different voltage values ​​and voltages of different polarities to the calibration system of the rotary passive electrostatic measuring instrument by a DC voltage source according to a preset step length, and maintaining the applied voltage values ​​of different levels for a preset time;

[0084] Obtain electric field measurement values ​​generated by the simulated DC wall bushing measured by an upward rotating passive electrostatic measuring instrument, a right rotating passive electrostatic measuring instrument, a left rotating passive electrostatic measuring instrument, and a downward rotating passive electrostatic measuring instrument at each voltage value, and determine electric field data at each voltage value based on the electric field measurement values.

[0085] The rotary passive electrostatic measuring instrument calibration system provided by the present invention mainly includes a high voltage input terminal 1, a support 2, a metal cylinder 3, an upper rotary passive electrostatic meter 4, a frame 5, a right rotary passive electrostatic meter 6, a left rotary passive electrostatic meter 7, and a lower rotary passive electrostatic meter 8. Figure 4 shown.

[0086] The metal cylinder 3 is made of conductive material, has no scratches, and is chamfered at the cross section. Its diameter is equal to the diameter Ds of the large shed skirt of the composite jacket of the DC wall bushing, and its length is greater than 2*Ds.

[0087] The support member 2 is a component connecting the metal cylinder 3 and the high-voltage input terminal 1. The material is a conductive metal, so that the metal cylinder 3 and the high-voltage input terminal 1 are at the same potential;

[0088] The frame 5 is made of epoxy insulating material and is used to fix the upward rotating passive electrostatic meter 4, the rightward rotating passive electrostatic meter 6, the leftward rotating passive electrostatic meter 7 and the downward rotating passive electrostatic meter 8. The frame can rotate 360° radially and move horizontally along the axial direction.

[0089] Step 102: Analyze the mapping relationship between the electric field data and the potential data to obtain a mathematical function expression of the electric field data and the potential data that can be used in actual field conditions;

[0090] Preferably, the mapping relationship between the electric field data and the potential data is analyzed to obtain a mathematical function expression of the electric field data and the potential data that can be used in an actual field; including:

[0091] Obtain the potential data of the simulated DC wall bushing at each voltage value;

[0092] By fitting the electric field data and potential data in different scenarios, the mapping relationship between the electric field data and the potential data is determined, and the mathematical function expression of the electric field data and the potential data that can be used in the actual field is obtained.

[0093] The present invention is based on Figure 2 Calculation process, calculation method of surface potential of casing composite jacket:

[0094] Step 1: Build a calibration system for the rotary passive electrostatic meter, and keep the distance between the rotary passive electrostatic meter and the metal cylinder at L in all four directions.

[0095] Step 2: Use a DC voltage source to apply different voltage values ​​and polarity voltages to the calibration system of the rotary passive electrostatic measuring instrument. The voltage range is from -40kV to +40kV with a step-up interval of 10kV. Each voltage value is stabilized for 30 minutes.

[0096] Step 3: Obtain the electric field measurement value of the rotary passive electrostatic measuring instrument at each voltage value and calculate the average value of the electric field measurement within 30 minutes;

[0097] Step 4: Fit the average value of the electric field measurement and the conductor potential value through mathematical formulas. The fitting results are as follows: Figure 6 As shown, there is a linear relationship between the two, and the proposed linear proportional coefficient is a;

[0098] Step 5: Write the fitting mathematical formula into the software calculation, so that the surface potential of the DC wall bushing can be directly calculated by measuring the electric field through the rotating passive electrostatic measuring instrument.

[0099] Step 103: Based on preset environmental parameters, a high-temperature, high-airflow environment is simulated; the calibrated rotary passive electrostatic measurement device is used to measure the surface electric field of a real DC wall bushing, and surface electric field data of the real DC wall bushing is obtained under different temperatures, different wind speeds, and the combined effects of temperature and wind speed.

[0100] Preferably, it also includes building a rotating passive electrostatic measuring device, which includes a metal support frame, a DC wall bushing, a metal peak nest, a heating net, a fan and a blower;

[0101] The metal support frame is used to support the DC wall bushing so that the distance between the rotary passive electrostatic measuring instruments arranged in four directions and the composite jacket large shed of the DC wall bushing is a preset distance L;

[0102] The fan blows air in a directional and uniform manner toward the DC wall bushing through the metal honeycomb and heating mesh;

[0103] The heating net is used to heat the air blown out by the fan.

[0104] Preferably, based on preset environmental parameters, a high temperature and high airflow environment is simulated; a calibrated rotary passive electrostatic measurement device is used to measure the surface electric field of a real DC wall bushing, and the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed are obtained, including:

[0105] Start the fans and heating network to generate environmental scenes with different wind speeds and temperatures;

[0106] A voltage is applied to the DC wall bushing to obtain electric field data generated by the DC wall bushing at a preset wind speed and a preset temperature.

[0107] Preferably, it also includes:

[0108] Applying voltage to the DC wall bushing to obtain electric field data generated by the DC wall bushing at multiple preset wind speeds, multiple preset temperatures, and multiple wind directions;

[0109] By applying the mathematical function expression, the potential data of the DC wall bushing under high temperature and high airflow is determined.

[0110] Step 104: Based on the surface electric field data of the real DC wall bushing, the potential data of the DC wall bushing under high temperature and high airflow is determined by applying the mathematical function expression.

[0111] The device for measuring the surface electric field of a DC wall bushing in a high-temperature and high-airflow environment provided by the present invention mainly includes a metal support frame 9, a DC wall bushing 10, a metal honeycomb 11, a heating network 12, a fan 13 and a blower 14.

[0112] The metal support frame 9 provided by the present invention plays the role of fixing the DC wall bushing at a certain height, so that the distance between the rotary passive electrostatic measuring instrument and the large shed of the composite jacket of the DC wall bushing is L;

[0113] The metal honeycomb 11 provided by the present invention is made of stainless steel and plays a role in uniform wind speed, so that the wind blowing toward the DC wall bushing is uniform in one direction, which can eliminate the influence of wind from other directions on the measurement results;

[0114] The heating net 12 provided by the present invention can make the wind have temperature, thereby effectively simulating a high temperature and high airflow environment.

[0115] according to Figure 5 The test arrangement and the surface electric field measurement process of DC wall bushing in high temperature and high airflow environment are as follows:

[0116] Step 1: Place the rotary passive electrostatic measuring instrument at four positions on the DC wall bushing. The distance from the bushing to the composite outer insulation shed is L, which should be consistent with that during calibration.

[0117] Step 2: Start the fan and heating device to obtain different wind speed and temperature combined environments, especially to simulate high temperature and high airflow environments;

[0118] Step 3: Pressurize the bushing for a long time until it enters a steady state, and obtain the change process of the DC wall bushing surface electric field from transient to steady state under high temperature and high airflow conditions;

[0119] Step 4: By using the surface potential calculation method of the bushing composite jacket, the electric field change process on the surface of the DC wall bushing is converted into the potential change process, which can be used to analyze the charge accumulation and dissipation on the surface of the DC wall bushing.

[0120] Step 5: Reset step 2, change the wind speed, temperature, or change the bushing installation direction to obtain different wind directions, and then repeat steps 3 to 4 to obtain the results of the combined effect of multiple factors on the bushing surface potential.

[0121] The present invention proposes a method for calculating the surface potential of the composite jacket of a DC wall bushing. By building a calibration system for a rotary passive electrostatic measuring instrument and applying different polarities and voltage values ​​to the calibration cylinder, the correspondence between the electric field measurement value and the applied voltage value of the rotary passive electrostatic instrument at a distance of L is obtained. The mapping relationship between the electric field strength measurement result and the conductor surface potential is obtained using a mathematical fitting formula. Based on this, the surface potential of the bushing is accurately reflected.

[0122] The present invention builds a high-temperature and high-airflow simulation environment to carry out experiments on the influence of single temperature or airflow velocity or airflow direction, or the combined influence of temperature, airflow velocity and direction on the surface electric field measurement of the composite jacket of a DC wall bushing based on a rotary passive electrostatic measuring instrument. A method for measuring the surface electric field of a DC wall bushing under high temperature and high airflow is proposed, which provides an experimental basis for studying the changes in the surface electric field and potential of the composite jacket of a DC wall bushing under the combined action of single factors and multiple factors.

[0123] The present invention uses a ±100kV pure SF6 gas-insulated DC wall bushing as an example to illustrate the surface electric field and potential of this type of DC wall bushing under high temperature and high airflow. First, the surface potential of the bushing composite jacket is calculated using a rotary passive electrostatic measuring instrument calibration system. The fitting results of the measured parameters are as follows: Figure 6 Then, a device for measuring the surface electric field of DC wall bushings in a high-temperature and high-airflow environment was built. Finally, a test on the influence of single factors and multiple factors on the surface electric field measurement of DC wall bushings can be carried out. The specific process is as follows:

[0124] 1. Calculation method of surface potential of casing composite jacket:

[0125] Step 1: Build a calibration system for the rotary passive electrostatic meter, and keep the distance between the rotary passive electrostatic meter and the metal cylinder at L in all four directions.

[0126] Step 2: Use a DC voltage source to apply different voltage values ​​and polarity voltages to the calibration system of the rotary passive electrostatic measuring instrument. The voltage range is from -40kV to +40kV with a step-up interval of 10kV. Each voltage value is stabilized for 30 minutes.

[0127] Step 3: Obtain the electric field measurement value of the rotary passive electrostatic measuring instrument at each voltage value and calculate the average value of the electric field measurement within 30 minutes;

[0128] Step 4: Fit the average value of the electric field measurement and the conductor potential value through mathematical formulas. The fitting results are as follows: Figure 6 As shown, there is a linear relationship between the two, and the proposed linear proportional coefficient is a;

[0129] Step 5: Write the fitting mathematical formula into the software calculation, so that the surface potential of the DC wall bushing can be directly calculated by measuring the electric field through the rotating passive electrostatic measuring instrument.

[0130] 2. The process of measuring the surface electric field of DC wall bushing in high temperature and high airflow environment is as follows:

[0131] Step 1: Place the rotary passive electrostatic measuring instrument at four positions on the DC wall bushing. The distance from the bushing to the composite outer insulation shed is L, which should be consistent with that during calibration.

[0132] Step 2: Start the fan and heating device to obtain different wind speed and temperature combined environments, especially to simulate high temperature and high airflow environments;

[0133] Step 3: Pressurize the bushing for a long time until it enters a steady state, and obtain the change process of the DC wall bushing surface electric field from transient to steady state under high temperature and high airflow conditions;

[0134] Step 4: By using the surface potential calculation method of the bushing composite jacket, the electric field change process on the surface of the DC wall bushing is converted into the potential change process, which can be used to analyze the charge accumulation and dissipation on the surface of the DC wall bushing.

[0135] Step 5: Reset step 2, change the wind speed, temperature, or change the bushing installation direction to obtain different wind directions, and then repeat steps 3 to 4 to obtain the results of the combined effect of multiple factors on the bushing surface potential.

[0136] Figure 7 This is a structural diagram of a system for calculating the surface potential of a DC wall bushing under high temperature and high airflow according to a preferred embodiment of the present invention.

[0137] like Figure 7 As shown, the present invention provides a system for calculating the surface potential of a DC wall bushing under high temperature and high airflow conditions, the system comprising:

[0138] An initialization unit 701 is used to calibrate the rotary passive electrostatic measuring instrument, and obtain electric field data of the rotary passive electrostatic measuring instrument under a known potential through the calibrated rotary passive electrostatic measuring instrument;

[0139] Preferably, the initial unit 701 is also used to build a rotary passive electrostatic measuring instrument calibration system, which includes: a high-voltage input terminal, a support, a metal cylinder, an upper rotary passive electrostatic measuring instrument, a frame, a right-hand rotary passive electrostatic measuring instrument, a left-hand rotary passive electrostatic measuring instrument, and a lower rotary passive electrostatic measuring instrument;

[0140] The metal cylinder is made of conductive material and is used to simulate the DC wall bushing. The diameter of the metal cylinder is equal to the diameter Ds of the DC wall bushing, and the length of the metal cylinder is at least twice the diameter Ds.

[0141] The support is connected to the metal cylinder and the high voltage input end and is made of conductive material;

[0142] The frame is made of epoxy insulating material and is used to fix the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument to the edge of the frame respectively; the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument, and the downward rotating passive electrostatic measuring instrument are at a preset distance L from the metal cylinder;

[0143] The frame can rotate 360 ​​degrees along the radial direction of the metal cylinder and move horizontally along the axial direction of the metal cylinder.

[0144] Preferably, the initialization unit 701 is configured to obtain electric field data generated by a simulated DC wall bushing in different scenarios using a calibrated rotary passive electrostatic measuring instrument, and is further configured to:

[0145] Applying different voltage values ​​and voltages of different polarities to the calibration system of the rotary passive electrostatic measuring instrument by a DC voltage source according to a preset step length, and maintaining the applied voltage values ​​of different levels for a preset time;

[0146] Obtain electric field measurement values ​​generated by the simulated DC wall bushing measured by an upward rotating passive electrostatic measuring instrument, a right rotating passive electrostatic measuring instrument, a left rotating passive electrostatic measuring instrument, and a downward rotating passive electrostatic measuring instrument at each voltage value, and determine electric field data at each voltage value based on the electric field measurement values.

[0147] The fitting unit 702 is used to analyze the mapping relationship between the electric field data and the potential data to obtain a mathematical function expression of the electric field data and the potential data that can be used in actual field conditions;

[0148] Preferably, the fitting unit 702 is used to analyze the mapping relationship between the electric field data and the potential data to obtain a mathematical function expression of the electric field data and the potential data that can be used in an actual field, and is also used to:

[0149] Obtain the potential data of the simulated DC wall bushing at each voltage value;

[0150] By fitting the electric field data and potential data in different scenarios, the mapping relationship between the electric field data and the potential data is determined, and the mathematical function expression of the electric field data and the potential data that can be used in the actual field is obtained.

[0151] An acquisition unit 703 is configured to simulate a high-temperature, high-airflow environment based on preset environmental parameters; use the calibrated rotary passive electrostatic measurement device to measure the surface electric field of a real DC wall bushing, and obtain surface electric field data for the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed;

[0152] Preferably, the acquisition unit 703 is further configured to construct a rotary passive electrostatic measurement device, the rotary passive electrostatic measurement device comprising a metal support frame, a DC wall bushing, a metal nest, a heating net, a fan, and a blower;

[0153] The metal support frame is used to support the DC wall bushing so that the distance between the rotary passive electrostatic measuring instruments arranged in four directions and the composite jacket large shed of the DC wall bushing is a preset distance L;

[0154] The fan blows air in a directional and uniform manner toward the DC wall bushing through the metal honeycomb and heating mesh;

[0155] The heating net is used to heat the air blown out by the fan.

[0156] Preferably, the acquisition unit 703 is configured to simulate a high-temperature and high-airflow environment based on preset environmental parameters; use the calibrated rotary passive electrostatic measurement device to measure the surface electric field of a real DC wall bushing, and obtain surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed; and further configured to:

[0157] Start the fans and heating network to generate environmental scenes with different wind speeds and temperatures;

[0158] A voltage is applied to the DC wall bushing to obtain electric field data generated by the DC wall bushing at a preset wind speed and a preset temperature.

[0159] Preferably, the acquiring unit 703 is further configured to:

[0160] Applying voltage to the DC wall bushing to obtain electric field data generated by the DC wall bushing at multiple preset wind speeds, multiple preset temperatures, and multiple wind directions;

[0161] By applying mathematical function expressions, the potential data of DC wall bushing under high temperature and high airflow are determined.

[0162] Result unit 704 is used to simulate a high-temperature, high-airflow environment based on preset environmental parameters; the calibrated rotary passive electrostatic measurement device is used to measure the surface electric field of a real DC wall bushing, and the surface electric field data of the real DC wall bushing is obtained under different temperatures, different wind speeds, and the combined effects of temperature and wind speed.

[0163] A system for calculating the surface potential of a DC wall bushing under high temperature and high airflow in a preferred embodiment of the present invention corresponds to a method for calculating the surface potential of a DC wall bushing under high temperature and high airflow in another preferred embodiment of the present invention, and will not be described in detail here.

[0164] The present invention provides a computer-readable storage medium storing a computer program for executing a method for calculating the surface potential of a DC wall bushing under high temperature and high airflow.

[0165] The present invention provides an electronic device, which includes: a processor and a memory; wherein,

[0166] Memory for storing processor-executable instructions;

[0167] The processor is used to read executable instructions from a memory and execute the instructions to implement a method for calculating the surface potential of a DC wall bushing under high temperature and high airflow.

[0168] It will be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0169] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0170] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0171] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0172] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0173] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

[0174] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0175] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / the [means, component, etc.]" are to be interpreted openly as referring to at least one instance of the means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily need to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A method for calculating the surface potential of a DC wall bushing under high temperature and high airflow, the method comprising: Calibrate the rotary passive electrostatic measuring instrument, and obtain the electric field data of the rotary passive electrostatic measuring instrument under a known potential through the calibrated rotary passive electrostatic measuring instrument; Analyze the mapping relationship between electric field data and potential data to obtain mathematical function expressions of electric field data and potential data for actual field; Based on the preset environmental parameters, a high temperature and high airflow environment is simulated; the calibrated rotary passive electrostatic measurement device is used to measure the surface electric field of the real DC wall bushing, and the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed are obtained; Based on the surface electric field data of the real DC wall bushing, the potential data of the DC wall bushing under high temperature and high airflow is determined by applying the mathematical function expression.

2. The method according to claim 1 further comprises building a rotary passive electrostatic measuring instrument calibration system, wherein the rotary passive electrostatic measuring instrument calibration system comprises: High voltage input terminal, support, metal cylinder, upward rotating passive electrostatic measuring instrument, frame, rightward rotating passive electrostatic measuring instrument, leftward rotating passive electrostatic measuring instrument, downward rotating passive electrostatic measuring instrument; The metal cylinder is made of conductive material and is used to simulate a DC wall bushing. The diameter of the metal cylinder is equal to the diameter Ds of the DC wall bushing, and the length of the metal cylinder is at least twice the diameter Ds. The support is connected to the metal cylinder and the high voltage input end and is made of conductive material; The frame is made of epoxy insulating material and is used to fix the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument and the downward rotating passive electrostatic measuring instrument to the edge of the frame respectively; the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument and the downward rotating passive electrostatic measuring instrument are at a preset distance L from the metal cylinder; The square frame can rotate 360 ​​degrees along the radial direction of the metal cylinder and move horizontally along the axial direction of the metal cylinder.

3. The method according to claim 2, wherein based on preset environmental parameters, a high temperature and high airflow environment is simulated; the calibrated rotary passive electrostatic measurement device is used to measure the surface electric field of the real DC wall bushing, and the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds and the combined action of temperature and wind speed are obtained, including: Applying different voltage values ​​and voltages of different polarities to the rotary passive electrostatic measuring instrument calibration system by a DC voltage source according to a preset step length, and maintaining the applied voltage values ​​of different levels for a preset time; Obtain the electric field measurement values ​​generated by the simulated DC wall bushing measured by the upward rotating passive electrostatic measuring instrument, the right rotating passive electrostatic measuring instrument, the left rotating passive electrostatic measuring instrument and the downward rotating passive electrostatic measuring instrument at each voltage value, and determine the electric field data at each voltage value based on the electric field measurement values.

4. The method according to claim 1, wherein the analyzing the mapping relationship between the electric field data and the potential data to obtain a mathematical function expression of the electric field data and the potential data that can be used in the actual field comprises: Obtaining potential data of the simulated DC wall bushing at each voltage value; By fitting the electric field data and potential data in different scenarios, the mapping relationship between the electric field data and the potential data is determined, and the mathematical function expressions of the electric field data and the potential data that can be used in the actual field are obtained.

5. The method according to claim 1 further comprises building a rotary passive electrostatic measuring device, wherein the rotary passive electrostatic measuring device comprises a metal support frame, a DC wall bushing, a metal peak nest, a heating net, a fan and a blower; The metal support frame is used to support the DC wall bushing, so that the distance between the rotary passive electrostatic measuring instruments arranged in four directions and the composite jacket large shed of the DC wall bushing is a preset distance L; The fan blows air in a directional and uniform manner toward the DC wall bushing through the metal honeycomb and the heating net; The heating network is used to heat the wind blown out by the fan.

6. The method according to claim 5, wherein based on preset environmental parameters, a high temperature and high airflow environment is simulated; the calibrated rotary passive electrostatic measurement device is used to measure the surface electric field of the real DC wall bushing, and the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds and the combined action of temperature and wind speed are obtained, including: Starting the fan and the heating network to generate environmental scenes with different wind speeds and different temperatures; A voltage is applied to the DC wall bushing to obtain electric field data generated by the DC wall bushing at a preset wind speed and a preset temperature.

7. The method according to claim 6, further comprising: Applying voltage to the DC wall bushing to obtain electric field data generated by the DC wall bushing at multiple preset wind speeds, multiple preset temperatures, and multiple wind directions; By applying the mathematical function expression, the potential data of the DC wall bushing under high temperature and high airflow is determined.

8. A system for calculating the surface potential of a DC wall bushing under high temperature and high airflow, the system comprising: An initial unit is used to calibrate the rotary passive electrostatic measuring instrument, and obtain electric field data of the rotary passive electrostatic measuring instrument under a known potential through the calibrated rotary passive electrostatic measuring instrument; A fitting unit, used for analyzing the mapping relationship between the electric field data and the potential data, and obtaining a mathematical function expression of the electric field data and the potential data for actual field; An acquisition unit is used to simulate a high temperature and high airflow environment based on preset environmental parameters to use the calibrated rotary passive electrostatic measurement device to measure the surface electric field of the real DC wall bushing, and obtain the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed; The result unit is used to determine the potential data of the DC wall bushing under high temperature and high airflow by applying the mathematical function expression based on the surface electric field data of the real DC wall bushing.

9. The system according to claim 8, wherein the initial unit is further used to construct a rotary passive electrostatic measuring instrument calibration system, wherein the rotary passive electrostatic measuring instrument calibration system comprises: High voltage input terminal, support, metal cylinder, upward rotating passive electrostatic measuring instrument, frame, rightward rotating passive electrostatic measuring instrument, leftward rotating passive electrostatic measuring instrument, downward rotating passive electrostatic measuring instrument; The metal cylinder is made of conductive material and is used to simulate a DC wall bushing. The diameter of the metal cylinder is equal to the diameter Ds of the DC wall bushing, and the length of the metal cylinder is at least twice the diameter Ds. The support is connected to the metal cylinder and the high voltage input end and is made of conductive material; The frame is made of epoxy insulating material and is used to fix the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument and the downward rotating passive electrostatic measuring instrument to the edge of the frame respectively; the upward rotating passive electrostatic measuring instrument, the right-hand rotating passive electrostatic measuring instrument, the left-hand rotating passive electrostatic measuring instrument and the downward rotating passive electrostatic measuring instrument are at a preset distance L from the metal cylinder; The square frame can rotate 360 ​​degrees along the radial direction of the metal cylinder and move horizontally along the axial direction of the metal cylinder.

10. The system according to claim 9, wherein the initial unit is used to simulate a high temperature and high airflow environment based on preset environmental parameters to use the calibrated rotary passive electrostatic measurement device to measure the surface electric field of the real DC wall bushing, obtain the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds and the combined action of temperature and wind speed, and is also used to: Applying different voltage values ​​and voltages of different polarities to the rotary passive electrostatic measuring instrument calibration system by a DC voltage source according to a preset step length, and maintaining the applied voltage values ​​of different levels for a preset time; Obtain the electric field measurement values ​​generated by the simulated DC wall bushing measured by the upward rotating passive electrostatic measuring instrument, the right rotating passive electrostatic measuring instrument, the left rotating passive electrostatic measuring instrument and the downward rotating passive electrostatic measuring instrument at each voltage value, and determine the electric field data at each voltage value based on the electric field measurement values.

11. The system according to claim 8, wherein the fitting unit is used to analyze the mapping relationship between the electric field data and the potential data to obtain a mathematical function expression of the electric field data and the potential data that can be used in an actual field, and is also used to: Obtaining potential data of the simulated DC wall bushing at each voltage value; By fitting the electric field data and potential data in different scenarios, the mapping relationship between the electric field data and the potential data is determined, and the mathematical function expressions of the electric field data and the potential data that can be used in the actual field are obtained.

12. The system according to claim 8, wherein the acquisition unit is further used to construct a rotary passive electrostatic measurement device, wherein the rotary passive electrostatic measurement device comprises a metal support frame, a DC wall bushing, a metal peak nest, a heating net, a fan and a blower; The metal support frame is used to support the DC wall bushing, so that the distance between the rotary passive electrostatic measuring instruments arranged in four directions and the composite jacket large shed of the DC wall bushing is a preset distance L; The fan blows air in a directional and uniform manner toward the DC wall bushing through the metal honeycomb and the heating net; The heating network is used to heat the wind blown out by the fan.

13. The system according to claim 12, wherein the acquisition unit is used to simulate a high temperature and high airflow environment based on preset environmental parameters to use the calibrated rotary passive electrostatic measurement device to measure the surface electric field of the real DC wall bushing, and obtain the surface electric field data of the real DC wall bushing under different temperatures, different wind speeds, and the combined effects of temperature and wind speed, and is also used to: Starting the fan and the heating network to generate environmental scenes with different wind speeds and different temperatures; A voltage is applied to the DC wall bushing to obtain electric field data generated by the DC wall bushing at a preset wind speed and a preset temperature.

14. The system according to claim 13, wherein the acquisition unit is further configured to: Applying voltage to the DC wall bushing to obtain electric field data generated by the DC wall bushing at multiple preset wind speeds, multiple preset temperatures, and multiple wind directions; By applying the mathematical function expression, the potential data of the DC wall bushing under high temperature and high airflow is determined.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 7.

16. An electronic device, characterized in that: The electronic device comprises: a processor and a memory; wherein, The memory is a memory for storing instructions executable by the processor; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of claims 1 to 7.

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