CN115047254A - Multi-parameter integrated measuring device and method for ground ion flow field - Google Patents

Abstract

The invention relates to a multi-parameter integrated measuring device and method for a ground ion flow field. The device measures the electric field intensity and the ion current density by using a direct current electric field instrument and an ion current plate, uses a corona wire mesh and a mesh polar plate to be matched with the ion current plate and the direct current electric field instrument to obtain the atmospheric ion mobility and the space charge density, measures the ambient wind speed of a monitoring point by using a wind speed measuring instrument, and measures the field temperature and humidity of the monitoring point by using a temperature and humidity measuring instrument; the invention realizes multi-parameter integrated measurement and effectively improves the accuracy of monitoring the ionic flow field near the high-voltage direct-current transmission line.

Description

A multi-parameter integrated measurement device and method for ground ion flow field

technical field

The invention relates to the field of electromagnetic environment of electric power system, in particular to a multi-parameter integrated measurement device and method of ground ion flow field.

Background technique

While the HVDC transmission project plays an important role in ensuring China's economic development and energy security, the electromagnetic environment problems generated by transmission lines have also received more and more attention. When the voltage of the HVDC transmission line exceeds the critical voltage of corona discharge, the air molecules around the transmission wire will be ionized into positive and negative ions, thereby generating space charges. The space charge moves directionally under the action of the electric field to form an ion current; the electric field of the space charge and the electric field of the wire work together to form a synthetic electric field. The multiphysics field in which the synthetic electric field generated by the corona discharge of the HVDC transmission line is coupled with the ion current is generally referred to as the ion current field.

Electric field strength and ion current density are important indicators of electromagnetic environment characteristics of DC transmission lines. In addition to being affected by the voltage level of the transmission line, the line structure, and the surface morphology of the conductor, the ion current field of the DC line is also related to the ion mobility, meteorological environment and other factors. The DC synthetic electric field is generally measured by a DC electric field, and the ion current density is usually measured using an ion current board made of a copper-clad printed circuit board.

However, there are still several problems in the current ion flow field monitoring device. The ground electric field and ion current of a transmission line are closely related to the spatial location, and the electric field strength and ion current density decay rapidly as the measurement point is far away from the transmission line. Affected by factors such as tower shielding, wire sag, and the difference in the degree of corona discharge on the wire surface, the distribution of the ion flow field along the transmission line direction is also quite different. The commonly used DC electric field meter and ion current plate are often made separately, and can only be placed in the same position in sequence or placed in different positions at the same time for measurement. If the distance between the two is close, mutual interference will occur due to the electric field distortion caused by the instrument, which will affect the measurement accuracy, and the space charge density value obtained therefrom will also have a large error.

Measuring other physical quantities that affect the ionic flow field requires a range of additional equipment. For example, the DC electric field meter contains a mechanical rotating structure, and its measurement value is directly related to the rotation speed of the blade. After long-term placement or long-distance transportation, the measurement accuracy will be affected. It needs to be calibrated in time with the help of a specific parallel plate device before use; The measurement needs to be carried out in an artificially controlled one-dimensional ion flow field environment, and the relevant devices are relatively large. Due to the limitations of the measurement site conditions, the ion mobility can only be selected according to the empirical value; the measurement instruments such as wind speed, temperature and humidity also require operators. Carry it separately. Therefore, in order to realize the accurate and complete measurement of the parameters of the ground ion current field near the DC transmission line, a multi-parameter integrated measurement device is urgently needed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a multi-parameter integrated measurement device and method of ground ion flow field, which can realize multi-parameter integrated measurement and effectively improve the accuracy of ion flow field monitoring near high-voltage direct current transmission lines.

For achieving the above object, the present invention provides the following scheme:

A multi-parameter integrated measurement device for ground ion flow field, comprising: corona wire mesh, mesh pole plate, ion flow plate, DC electric field meter, ground pole plate, first high-voltage DC power supply, second high-voltage DC power supply, wind speed Measuring instrument, temperature and humidity measuring instrument and multiple support rods;

The corona wire mesh, the mesh electrode plate, the ion current plate and the ground electrode plate are arranged in parallel from top to bottom in order, and are supported by the support rod; the corona wire mesh and the The mesh electrode plate is used to cooperate with the ion current plate and the DC electric field meter to obtain atmospheric ion mobility and space charge density;

The ion flow plate includes: a reference potential area and a measurement area; the reference potential area surrounds the measurement area from inside and outside, and is connected to the measurement area through a sampling resistor; the reference potential area is grounded; the ion The flow plate is used to measure the ion current density;

The DC electric field meter is arranged between the ion current plate and the ground electrode plate; the DC electric field meter measures the electric field intensity at the center of the current position through the opening in the middle of the ion current plate;

the first high-voltage DC power supply is connected to the corona wire mesh; the first high-voltage DC power supply is used to apply first voltages of different magnitudes to the corona wire mesh;

the second high-voltage DC power supply is connected to the mesh electrode plate; the second high-voltage DC power supply is used to apply a second voltage to the mesh electrode plate;

The anemometer and the temperature and humidity measuring instrument are bonded on the support rod between the mesh electrode plate and the ion current plate; the anemometer is used to measure the ambient wind speed of the monitoring point; The temperature and humidity measuring instrument is used to measure the on-site temperature and humidity of the monitoring point.

Optionally, the corona wires of the corona wire mesh are arranged in parallel.

Optionally, the mesh of the mesh electrode plate is a square grid.

Optionally, it also includes: a data acquisition module;

The data acquisition module is respectively connected with the ion current plate and the DC electric field meter.

A ground ion flow field multi-parameter integrated measurement method, based on the ground ion flow field multi-parameter integrated measurement device, the method comprising:

According to the second voltage applied by the second high-voltage DC power source to the mesh plate, the DC electric field meter is calibrated to measure the electric field intensity;

According to the area of the measurement area of the ion current plate and the voltage across the sampling resistor, measure the ion current density;

Measure the electric field strength and ion current density jointly generated by the corona wire mesh and the mesh plate, and obtain the ion mobility in the field environment;

Obtain the space charge density of the monitoring point according to the electric field strength, ion current density and ion mobility;

Use an anemometer to measure the ambient wind speed at the monitoring point;

Use a temperature and humidity measuring instrument to measure the on-site temperature and humidity of the monitoring point.

Optionally, calibrating the DC electric field meter and measuring the electric field intensity according to the second voltage applied by the second high-voltage DC power supply to the mesh plate, specifically includes:

Obtain the measurement signal of the DC electric field meter according to the second voltage applied by the second high-voltage DC power source to the mesh plate;

Determine the corresponding actual electric field strength value according to the second voltage and the distance from the mesh electrode plate to the ion current plate, and determine the calibration coefficient according to the actual electric field strength value;

Use the calibration coefficient to calibrate the corresponding measurement signal to determine the electric field strength.

Optionally, measuring the ion current density according to the area of the measurement region of the ion current plate and the voltage across the sampling resistor specifically includes:

确定离子流密度；Use the formula

Determine the ion current density;

Among them, J is the ion current density, U _J is the voltage across the sampling resistor, R is the resistance value of the sampling resistor, and S is the area of the measurement area in the ion flow plate.

Optionally, the measurement of the electric field intensity and ion current density jointly generated by the corona wire mesh and the mesh plate to obtain the ion mobility in the field environment specifically includes:

确定现场环境中的离子迁移率；Use the formula

Determining ion mobility in the field environment;

Among them, E is the electric field strength, J is the ion current density, ε is the dielectric constant of air, K is the ion mobility, d is the distance from the mesh plate to the ion current plate, and U ₂ is the second voltage.

Optionally, the obtaining the space charge density of the monitoring point according to the electric field strength, ion current density and ion mobility specifically includes:

确定空间电荷密度；Use the formula

determine the space charge density;

where ρ is the space charge density, E is the electric field strength, J is the ion current density, and K is the ion mobility.

According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

The invention provides a multi-parameter integrated measurement device and method for ground ion current field. The device uses a DC electric field meter and an ion current plate to measure the electric field intensity and ion current density, and uses a corona wire mesh and a mesh plate to measure the electric field intensity and ion current density. Cooperate with the ion flow plate and the DC electric field meter to obtain the atmospheric ion mobility and space charge density, use the wind speed measuring instrument to measure the ambient wind speed of the monitoring point, and use the temperature and humidity measuring instrument to measure the on-site temperature and humidity of the monitoring point; Density, space charge density, ion mobility, wind speed, temperature and humidity measuring instrument and DC electric field meter calibration device are integrated into the same device, which can realize comprehensive measurement of ion flow field parameters and effectively improve the monitoring of ion flow field near HVDC transmission lines. Accuracy, and easy to operate and carry, suitable for field work environment.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

1 is a schematic structural diagram of a multi-parameter integrated measurement device for a ground ion flow field provided by the present invention;

Fig. 2 is the structural representation of corona wire mesh;

Fig. 3 is the structural representation of the mesh electrode plate;

Fig. 4 is the structural representation of ion current plate and DC electric field instrument;

Fig. 5 is the structural schematic diagram of anemometer and temperature and humidity measuring instrument;

Fig. 6 is the ground electric field intensity value measured by the present invention;

Fig. 7 is the ground ion current density value measured by the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide a multi-parameter integrated measurement device and method of ground ion flow field, which can realize multi-parameter integrated measurement and effectively improve the accuracy of ion flow field monitoring near high-voltage direct current transmission lines.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic structural diagram of a ground ion flow field multi-parameter integrated measurement device provided by the present invention. As shown in FIG. 1 , the ground ion flow field multi-parameter integrated measurement device provided by the present invention includes: electric Halo wire mesh 1, mesh plate 2, ion current plate 3, DC electric field meter 6, grounding plate 7, first high-voltage DC power supply, second high-voltage DC power supply, anemometer 13, temperature and humidity measuring instrument 14 and many more. A support rod 8; the DC electric field meter 6 and the center of the ion current plate 3 coincide.

The corona wire mesh 1, the mesh electrode plate 2, the ion current plate 3 and the ground electrode plate 7 are arranged in parallel from top to bottom in order, and are supported by the support rod 8; The halo wire mesh 1 and the mesh electrode plate 2 are used to cooperate with the ion current plate 3 and the DC electric field meter 6 to obtain atmospheric ion mobility and space charge density.

As shown in FIG. 4 , the ion current plate 3 includes: a reference potential region 4 and a measurement region 5 ; the reference potential region 4 surrounds the measurement region 5 from inside and outside, and is connected to the measurement region through a sampling resistor 10 5 is connected; the reference potential area 4 is grounded; the ion current plate 3 is used to measure the ion current density. The inner area of the reference potential area 4 is used to isolate the interference of the airflow on the measured value of the measurement area 5 .

The DC electric field meter 6 is arranged between the ion current plate 3 and the ground electrode plate 7 ; the DC electric field meter 6 measures the electric field intensity at the center of the current position through the hole in the middle of the ion current plate 3 .

The first high voltage DC power supply is connected to the corona wire mesh 1 ; the first high voltage DC power supply is used to apply first voltages of different magnitudes to the corona wire mesh 1 .

The second high-voltage DC power supply is connected to the mesh electrode plate 2 ; the second high-voltage DC power supply is used to apply a second voltage to the mesh electrode plate 2 .

As shown in FIG. 5 , the wind velocity measuring instrument 13 and the temperature and humidity measuring instrument 14 are bonded to the support rod 8 between the mesh electrode plate 2 and the ion current plate 3; the wind velocity The measuring instrument 13 is used to measure the ambient wind speed of the monitoring point; the temperature and humidity measuring instrument 14 is used to measure the on-site temperature and humidity of the monitoring point. During the measurement process, the wind speed measurement direction is perpendicular to the direction of the transmission line.

As a specific embodiment, the support rod 8 is made of insulating material; the support rod 8 at the bottom of the grounding electrode plate 7 includes a screw structure, which is used to adjust the height of the four corners of the grounding electrode plate 7 to the ground, so that the whole device is not flat. level on the ground.

As a specific embodiment, the outer contours of the corona wire mesh 1, the mesh electrode plate 2, the ion current plate 3, and the ground electrode plate 7 are all square.

As shown in FIG. 2 , the corona wires 11 of the corona wire mesh 1 are arranged in parallel.

As a specific embodiment, the corona wire 11 is made of thin copper wire.

As shown in FIG. 3 , the mesh holes 12 of the mesh electrode plate 2 are square grids.

As a specific embodiment, the mesh holes 12 of the mesh electrode plate 2 are made by winding iron wires.

The multi-parameter integrated measurement device of the ground ion flow field provided by the present invention further comprises: a data acquisition module 9 .

The data acquisition module 9 is respectively connected with the ion current plate 3 and the DC electric field meter 6 .

The data acquisition module 9 collects the measurement signals of the ion current plate 3 and the DC electric field meter 6 , and supplies power to the DC electric field meter 6 , and the measurement personnel analyze and process the measurement signals on the human-computer interaction interface of the data acquisition module 9 .

The present invention provides a multi-parameter integrated measurement method of ground ion flow field, based on the multi-parameter integrated measurement device of ground ion flow field, the method includes:

S101 , calibrate the DC electric field meter 6 according to the second voltage applied to the mesh plate 2 by the second high-voltage DC power supply, and measure the electric field intensity.

S101 specifically includes:

According to the second voltage applied by the second high-voltage DC power source to the mesh plate 2, the measurement signal of the DC electric field meter 6 is acquired.

The corresponding actual electric field strength value is determined according to the second voltage and the distance from the mesh electrode plate 2 to the ion current plate 3 , and the calibration coefficient is determined according to the actual electric field strength value.

确定实际电场强度值。Use the formula

Determine the actual electric field strength value.

The calibration coefficients are determined using the formula E _r =kE _m +b.

Use the calibration coefficient to calibrate the corresponding measurement signal to determine the electric field strength.

S102 , measure the ion current density according to the area of the measurement region 5 of the ion current plate 3 and the voltage across the sampling resistor 10 .

S102 specifically includes:

确定离子流密度。Use the formula

Determine the ion current density.

Among them, J is the ion current density, U _J is the voltage across the sampling resistor 10 , R is the resistance value of the sampling resistor 10 , and S is the area of the measurement region 5 in the ion flow plate 3 .

S103, measure the electric field intensity and ion current density jointly generated by the corona wire mesh 1 and the mesh electrode plate 2, and obtain the ion mobility in the field environment.

S103 specifically includes:

确定现场环境中的离子迁移率。Use the formula

Determine ion mobility in the field environment.

Among them, E is the electric field strength, J is the ion current density, ε is the dielectric constant of air, K is the ion mobility, d is the distance from the mesh plate 2 to the ion current plate 3, and U ₂ is the second voltage.

S104, according to the electric field intensity, ion current density and ion mobility, obtain the space charge density of the monitoring point.

Specifically include:

确定空间电荷密度。Use the formula

Determine the space charge density.

where ρ is the space charge density, E is the electric field strength, J is the ion current density, and K is the ion mobility.

S105, use the wind speed measuring instrument 13 to measure the ambient wind speed of the monitoring point.

S106, use the temperature and humidity measuring instrument 14 to measure the on-site temperature and humidity of the monitoring point.

As a specific example, the size of the 4-layer electrode plates is 1 meter × 1 meter; the diameter of the corona wire 11 is 0.5 mm, and the distance is 10 cm; 8. The lengths from top to bottom are 20 cm, 15 cm, 10 cm, and 5 cm in turn; the ion current plate 3 measuring area 5 has a diameter of 60 cm; the DC electric field meter 6 probe is a cylinder with a height of 10 cm, a diameter of 10 cm, and a measuring range It is ±75kV/m; the output range of the first and second DC power supply is ±80kV.

The lines measured in Figure 6 and Figure 7 are DC ±800kV, transverse wind speed +0.8m/s, temperature 25.2°C, relative humidity 53%, ion mobility 1.62cm ² /(V s) for positive ions, 1.83cm ² for negative ions /(V·s).

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

In this paper, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present invention; meanwhile, for those skilled in the art, according to the present invention There will be changes in the specific implementation and application scope. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (9)

1. a ground ion current field multi-parameter integrated measuring device, is characterized in that, comprises: corona wire mesh, mesh pole plate, ion flow plate, DC electric field meter, grounding pole plate, the first high-voltage DC power supply, the first Two high-voltage DC power supplies, anemometers, temperature and humidity measuring instruments and multiple support rods; The corona wire mesh, the mesh electrode plate, the ion current plate and the ground electrode plate are arranged in parallel from top to bottom in order, and are supported by the support rod; the corona wire mesh and the The mesh electrode plate is used to cooperate with the ion current plate and the DC electric field meter to obtain atmospheric ion mobility and space charge density; The ion current plate includes: a reference potential area and a measurement area; the reference potential area surrounds the measurement area on both sides, and is connected to the measurement area through a sampling resistor; the reference potential area is grounded; the ion current Plate for measuring ion current density; The DC electric field meter is arranged between the ion current plate and the ground electrode plate; the DC electric field meter measures the electric field intensity at the center of the current position through the opening in the middle of the ion current plate; the first high-voltage DC power supply is connected to the corona wire mesh; the first high-voltage DC power supply is used to apply first voltages of different magnitudes to the corona wire mesh; the second high-voltage DC power supply is connected to the mesh electrode plate; the second high-voltage DC power supply is used to apply a second voltage to the mesh electrode plate; The anemometer and the temperature and humidity measuring instrument are bonded on the support rod between the mesh electrode plate and the ion current plate; the anemometer is used to measure the ambient wind speed of the monitoring point; The temperature and humidity measuring instrument is used to measure the on-site temperature and humidity of the monitoring point. 2 . The multi-parameter integrated measurement device for ground ion flow field according to claim 1 , wherein the corona wires of the corona wire mesh are arranged in parallel. 3 . 3 . The multi-parameter integrated measurement device for ground ion flow field according to claim 1 , wherein the mesh of the mesh electrode plate is a square grid. 4 . 4. A multi-parameter integrated measurement device for ground ion flow field according to claim 1, characterized in that, further comprising: a data acquisition module; The data acquisition module is respectively connected with the ion current plate and the DC electric field meter. 5. A ground ion flow field multi-parameter integrated measurement method, based on the ground ion flow field multi-parameter integrated measurement device according to any one of claims 1-4, wherein the method comprises: According to the second voltage applied by the second high-voltage DC power source to the mesh plate, the DC electric field meter is calibrated to measure the electric field intensity; According to the area of the measurement area of the ion current plate and the voltage across the sampling resistor, measure the ion current density; Measure the electric field strength and ion current density jointly generated by the corona wire mesh and the mesh plate, and obtain the ion mobility in the field environment; Obtain the space charge density of the monitoring point according to the electric field strength, ion current density and ion mobility; Use an anemometer to measure the ambient wind speed at the monitoring point; Use a temperature and humidity measuring instrument to measure the on-site temperature and humidity of the monitoring point. 6 . The multi-parameter integrated measurement method of ground ion flow field according to claim 5 , wherein, according to the second voltage applied by the second high-voltage DC power source to the mesh plate, the DC electric field meter is measured 6 . Calibration, measuring electric field strength, including: Obtain the measurement signal of the DC electric field meter according to the second voltage applied by the second high-voltage DC power source to the mesh plate; Determine the corresponding actual electric field strength value according to the second voltage and the distance from the mesh electrode plate to the ion current plate, and determine the calibration coefficient according to the actual electric field strength value; Use the calibration coefficient to calibrate the corresponding measurement signal to determine the electric field strength. 7. a kind of ground ion current field multi-parameter integrated measurement method according to claim 5, is characterized in that, described according to the area of the measurement area of the ion current plate and the voltage at both ends of the sampling resistor, measure the ion current density, specifically include: Use the formula

Determine the ion current density; Among them, J is the ion current density, U _J is the voltage across the sampling resistor, R is the resistance value of the sampling resistor, and S is the area of the measurement area in the ion flow plate. 8. a kind of ground ion current field multi-parameter integrated measurement method according to claim 5, it is characterized in that, described measuring the electric field intensity and ion current density that the corona wire mesh and the mesh electrode plate produce jointly produce, Obtain ion mobility in the field environment, including: Use the formula

Determining ion mobility in the field environment; Among them, E is the electric field strength, J is the ion current density, ε is the dielectric constant of air, K is the ion mobility, d is the distance from the mesh plate to the ion current plate, and U ₂ is the second voltage. 9 . The multi-parameter integrated measurement method of ground ion current field according to claim 5 , wherein, according to the electric field strength, ion current density and ion mobility, the space charge density of the monitoring point is obtained, specifically comprising: 10 . : Use the formula

determine the space charge density; where ρ is the space charge density, E is the electric field strength, J is the ion current density, and K is the ion mobility.

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