Calibration method and calibration system for direct-current electric field measuring device of ion flow fan

Abstract

The invention provides a calibration method and calibration system for a direct-current electric field measuring device of an ion flow fan, and belongs to the technical field of power grid environment protection. The ion fan device is used for generating space ions, injecting controllable ion current between the high-voltage polar plate and the grounding polar plate, and combining with the electrostatic field to form a calibration area to simulate a space charge environment; the ion mobility measuring device is used for monitoring the ion mobility in the electrostatic field area and acquiring the electric field in the calibration area; the direct-current electric field measurement module is used for measuring the actual electric field intensity in the calibration area; and the ion current density measurement module is used for measuring the ion current density. The method has the advantages that the calibration area is formed by introducing the ion fan device and combining the electrostatic field, the space charge environment generated during operation of high-voltage equipment is effectively simulated, the defect that a traditional electrostatic field calibration method neglects the influence of ion flow is overcome, and the consistency of the calibration environment and the actual working condition is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of power grid environmental protection, and in particular relates to a calibration method and a calibration system for a direct current electric field measuring device of an ion flow fan. Background Art

[0002] With the rapid development of high-voltage direct current transmission projects in my country, power transmission and transformation facilities are getting closer and closer to public activity areas. The potential impact of the direct current electric field generated by them on the surrounding environment has become an important issue in the field of environmental protection. Accurate measurement of the direct current electric field is the core technical means to evaluate the electromagnetic environment and resolve public disputes.

[0003] Traditional calibration methods such as the parallel plate method usually rely on electrostatic field theory and assume that there is no charge distribution in space. However, in actual operation, high-voltage equipment will ionize the air to generate space charge (ion flow), resulting in a deviation between the calibration environment and the actual working conditions. Summary of the invention

[0004] The technical problem to be solved by the present invention is to introduce an ion blower to simulate a space charge environment, correct the error of ignoring charge interference in traditional calibration, and in view of the shortcomings of the prior art, provide a calibration method and a calibration system for a DC electric field measuring device of an ion flow blower, which can simulate a real space charge environment, realize automatic calibration and improve measurement accuracy. In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: comprising an electric field generating module: comprising a high-voltage electrode plate and a grounding electrode plate, for generating a uniform electrostatic field; an ion blower device, arranged on one side of the high-voltage electrode plate and the grounding electrode plate, for generating space ions, A controllable ion flow is injected between the high-voltage electrode and the grounding electrode to form a calibration area in combination with the electrostatic field to simulate the space charge environment; an ion mobility measuring device is arranged between the high-voltage electrode and the grounding electrode to monitor the size of the ion mobility in the electrostatic field area and obtain the electric field in the calibration area; a voltage measuring unit: the measuring end is connected to the high-voltage electrode to measure the actual working voltage of the high-voltage electrode; a DC electric field measuring module: used to measure the actual electric field strength in the calibration area; an ion flow density measuring module: including a Wilson plate and a picoammeter, arranged on the grounding electrode to measure the ion flow density.

[0005] Furthermore, the calibration area is located between the high voltage plate and the ground plate, and is a three-dimensional space that is affected by both the electrostatic field component and the ion flow component.

[0006] Furthermore, it also includes a direct current power supply, the output end of which is connected to the high-voltage plate to provide an adjustable voltage for the high-voltage plate.

[0007] Furthermore, the DC electric field measurement module includes a DC electric field measurement device and a control terminal. The DC electric field measurement device is arranged between the high voltage plate and the grounding plate 10 and is used to measure the actual electric field strength in the calibration area.

[0008] A calibration method for a DC electric field measuring device of an ion flow blower is completed based on a calibration system of the DC electric field measuring device of the ion flow blower, and is characterized by comprising the following steps:

[0009] The ion flow is generated by the ion fan device, and the electrostatic field and controllable ion flow are established by combining the high voltage plate and the ground plate;

[0010] Obtaining a current I on the Wilson plate, obtaining an ion current density J0 through the current I, and obtaining a theoretical mobility M1 through the ion current density J0;

[0011] Measuring the ion mobility M0 in the calibration region using an ion mobility measuring device;

[0012] Compare the theoretical mobility M1 with the measured value M0. When M1<M0, increase the ion generation amount of the ion blower device until M1≥M0 is satisfied.

[0013] When M1≥M0, the electric field strength E0 at the location where the DC electric field measurement module is located is obtained, and the calibration coefficient m of the DC electric field measurement module under the electric field is obtained to complete the single-point calibration;

[0014] Adjust the voltage V of the high voltage plate T , get any voltage V after adjustment T Get the full range calibration coefficient of the DC electric field by

[0015] Further, the method of obtaining the current I on the Wilson plate, obtaining the ion current density J0 through the current I, and obtaining the theoretical mobility M1 through the ion current density J0 includes:

[0016] The current I on the Wilson plate with an area of ​​A0 is measured by a picoammeter. When the current value does not change, the current at this time is recorded as I0, so the ion flow density J0 in the space is:

[0017]

[0018] Furthermore, the theoretical mobility

[0019] Among them, V T is the voltage on the high-voltage plate, ε0 is the dielectric constant of vacuum; d is the gap distance between the high-voltage plate and the grounding plate.

[0020] Furthermore, the electric field strength of the DC electric field measurement module

[0021] Among them, V T is the voltage on the high-voltage plate, z is the distance between the point where the DC electric field measuring device is located and the high-voltage plate, and d / 2 is taken, where d is the gap distance between the plates.

[0022] Furthermore, the calibration coefficient m of the DC electric field measurement module is E0 / E1

[0023] Wherein, E1 is the display value of the DC electric field measurement module.

[0024] Further, adjust the voltage V of the high voltage plate T , get any voltage V after adjustment T The method for obtaining the full range calibration coefficient of the DC electric field includes:

[0025] Selecting a set number of voltage point values ​​at equal intervals according to the measuring range of the DC electric field measurement module, and obtaining calibration coefficients corresponding to the selected voltage point values;

[0026] The calibration coefficients corresponding to the selected voltage point values ​​are sorted to obtain the full-scale range calibration coefficients of the DC electric field.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. By introducing an ion blower device, a controllable ion flow is injected between the high-voltage plate and the grounding plate, and a calibration area is formed in combination with an electrostatic field, which effectively simulates the space charge environment generated when the high-voltage equipment is in operation. This solves the defect of the traditional electrostatic field calibration method that ignores the influence of ion flow, and improves the consistency between the calibration environment and the actual working conditions.

[0029] 2. The ion mobility measuring device is used to monitor and dynamically adjust the ion generation in real time to ensure that the theoretical mobility matches the measured value (calibration is performed when M1 ≥ M0), effectively eliminating the measurement deviation caused by uneven spatial charge distribution and improving the calibration accuracy of the DC electric field measuring device;

[0030] 3. By adjusting the high-voltage plate voltage V~T~, the calibration coefficients at different voltage points are obtained, and the full-scale calibration curve is fitted based on the multi-voltage point data, so that the system can adapt to DC electric field environments of different intensities, broadening the scope of application of the calibration device;

[0031] 4. Combine the Wilson plate and picoammeter to measure the ion current density, and synchronously obtain the electric field strength, mobility and ion current density data through the voltage measurement unit and the DC electric field measurement module, so as to achieve the precise collaborative analysis of multi-dimensional parameters and provide reliable data support for calibration in complex electromagnetic environments;

[0032] 5. The calibration method simplifies the operation process through formula calculation (such as the mathematical model of theoretical mobility M1 and electric field strength E0) and automatic adjustment (ion fan ion quantity control). At the same time, the modular design facilitates the expansion and upgrade of system functions and is suitable for rapid deployment in industrial sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] Figure 1 : A schematic diagram of the structure of a calibration system for a DC electric field measuring device of an ion flow blower in Example 1 of the present invention;

[0035] Figure 2 : Schematic diagram of the flow chart of the calibration method of the DC electric field measuring device of the ion flow blower in Example 1 of the present invention.

[0036] Among them, 1-high voltage plate, 2-ion fan device, 3-ion mobility measuring device, 4-DC power supply, 5-voltage measuring unit, 6-DC electric field measuring device, 7-control terminal, 8-picoammeter, 9-Wilson plate, 10-ground plate. DETAILED DESCRIPTION

[0037] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments and the accompanying drawings, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0038] Example 1: See Figure 1 , a calibration system of a DC electric field measuring device of an ion flow blower of this embodiment includes:

[0039] Electric field generation module: including a high-voltage electrode 1 and a grounding electrode 10, which are made of two parallel metal plates. The high-voltage electrode is kept parallel and non-contacting with the grounding electrode through an insulating support frame. The distance between the high-voltage electrode 1 and the grounding electrode 10 is d, which is used to generate a uniform electrostatic field. When a voltage V is applied and the grounding electrode is grounded (i.e., the potential is zero), a uniform electrostatic field is formed between the two electrodes, and its field strength E can be calculated by the formula E=V / d;

[0040] By adjusting the high voltage plate voltage V T , thereby realizing the control of the electric field strength, obtaining the calibration coefficients at different voltage points, and fitting the full-range calibration curve based on the multi-voltage point data, so that the system can adapt to DC electric field environments of different intensities, broadening the scope of application of the calibration device;

[0041] The ion blower device 2 is arranged on one side of the high-voltage electrode plate 1 and the grounding electrode plate 10. The ion flow is pushed by the Lorentz force under the action of the electric field and moves toward the grounding electrode plate to generate space ions. By adjusting the working parameters of the ion generator (such as discharge voltage, frequency, etc.), the density and direction of the ion flow can be controlled. A controllable ion flow is injected between the high-voltage electrode plate 1 and the grounding electrode plate 10, and combined with the electrostatic field to form a calibration area to simulate the space charge environment.

[0042] By introducing an ion blower device, a controllable ion flow is injected between the high-voltage plate and the ground plate, and a calibration area is formed in combination with an electrostatic field, which effectively simulates the space charge environment generated when the high-voltage equipment is running. This solves the defect of the traditional electrostatic field calibration method that ignores the influence of ion flow, and improves the consistency between the calibration environment and the actual working conditions.

[0043] An ion mobility measuring device 3 is arranged between the high voltage plate 1 and the grounding plate 10. A small sensor (such as a metal mesh or a probe) is installed between the high voltage plate and the grounding plate to capture the ion flow and monitor the size of the ion mobility in the electrostatic field area. The mobility can be calculated by the formula μ=E / v, where v is the average migration speed of the ions. The electric field in the calibration area is obtained, and the ion generation amount is monitored and dynamically adjusted in real time by the ion mobility measuring device to ensure that the theoretical mobility matches the measured value, effectively eliminate the measurement deviation caused by uneven spatial charge distribution, and improve the calibration accuracy of the DC electric field measuring device;

[0044] Voltage measuring unit 5: the measuring end is connected to the high voltage plate 1 and is used to measure the actual working voltage of the high voltage plate 1;

[0045] DC electric field measurement module: used to measure the actual electric field strength in the calibration area. The distance between the point measured by the DC electric field measurement module and the high voltage plate 1 is z;

[0046] Ion current density measurement module: includes a Wilson plate 9 and a picoammeter 8, which are arranged on a grounding plate 10 and are used to measure the ion current density.

[0047] See also Figure 1 The calibration area is located between the high voltage plate 1 and the grounding plate 10, and is a three-dimensional space affected by both the electrostatic field component and the ion flow component.

[0048] See also Figure 1 , including a DC power supply 4, the output end of which is connected to the high voltage plate 1 to provide an adjustable voltage V for the high voltage plate 1 T .

[0049] See also Figure 1The DC electric field measurement module includes a DC electric field measurement device 6 and a control terminal 7. The DC electric field measurement device 6 is arranged between the high-voltage plate 1 and the grounding plate 10, and is used to measure the actual electric field strength in the calibration area. The distance between the point measured by the DC electric field measurement device 6 and the high-voltage plate 1 is z.

[0050] Beneficial effects:

[0051] 1. Through the synergistic effect of high-voltage plates and ion fans, controllable ion flow is superimposed on the electrostatic field to construct a composite field environment that includes both electrostatic field components and ion flow components. This simulates the spatial charge distribution characteristics of high-voltage equipment in actual operation and solves the technical pain points of the deviation between the traditional calibration system and the actual working conditions.

[0052] 2. By adjusting the high-voltage plate voltage V~T~, the calibration coefficient at different voltage points is obtained, and the full-scale calibration curve is fitted based on the multi-voltage point data, so that the system can adapt to DC electric field environments of different intensities, broadening the application scope of the calibration device.

[0053] Embodiment 2: A calibration method for a DC electric field measuring device of an ion flow blower is implemented based on a calibration system for a DC electric field measuring device of an ion flow blower according to an embodiment, and comprises:

[0054] a) Turn on the DC power supply and ion fan, and apply voltage V to the high voltage plate T , generating an initial electric field and charged ions of the same polarity;

[0055] c) using an ion mobility measuring device to measure the ion mobility M0 in the calibration area;

[0056] d) The current I on the Wilson plate with an area of ​​A0 can be measured by a picoammeter, and the change in the current value can be observed. When the current value does not change, the current at this time is recorded as I0, and the ion flow density J0 in the space can be calculated by using formula (1);

[0057]

[0058] e) According to the measurement result of the current density in the previous step, the theoretical mobility M1 of the ions is calculated;

[0059]

[0060] In formula (2), VT is the voltage on the high voltage plate, ε0 is the vacuum dielectric constant, and d is the gap distance between the plates.

[0061] f) Compare the measured ion mobility M0 with the calculated theoretical mobility M1. When M1≥M0, the electric field strength E0 at the location of the DC electric field measurement module can be calculated using formula (3); if M1<M0, continue to increase the ion generation amount of the ion fan until M1≥M0 is satisfied;

[0062]

[0063] In the formula, V T is the voltage on the high-voltage plate, z is the distance between the point where the DC electric field measurement device is located and the high-voltage plate, generally taken as d / 2, and d is the gap distance between the plates;

[0064] g) Then, the calibration coefficient m of the DC electric field measurement module under a certain electric field is calculated by formula (3), where E1 is the display value of the DC electric field measurement device;

[0065] m=E0 / E1 (4)

[0066] h) Change the voltage U of the high voltage plate, and then repeat b) to f) to achieve accurate calibration within the measuring range of the DC electric field.

[0067] Beneficial Effects

[0068] The calibration method simplifies the operation process through formula calculation (such as mathematical model of theoretical mobility M1 and electric field strength E0) and automatic adjustment (ion fan ion quantity control). At the same time, the modular design facilitates system function expansion and upgrade, which is suitable for rapid deployment in industrial sites.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A calibration system for a DC electric field measuring device of an ion flow blower, characterized in that: include: The electric field generating module comprises a high voltage plate (1) and a grounding plate (10), and is used to generate a uniform electrostatic field; An ion blower device (2) is arranged on one side of the high voltage plate (1) and the ground plate (10), and is used to generate space ions, inject a controllable ion flow between the high voltage plate (1) and the ground plate (10), and form a calibration area in combination with an electrostatic field to simulate a space charge environment; An ion mobility measuring device (3) is arranged between the high voltage electrode (1) and the ground electrode (10) and is used to monitor the magnitude of ion mobility in the electrostatic field region and obtain the electric field in the calibration region; Voltage measuring unit (5): the measuring end is connected to the high voltage plate (1) and is used to measure the actual working voltage of the high voltage plate (1); DC electric field measurement module: used to measure the actual electric field strength in the calibration area; The ion current density measurement module comprises a Wilson plate (9) and a picoammeter (8), which is arranged on a grounding electrode plate (10) and is used to measure the ion current density.

2. The calibration system of the DC electric field measuring device of the ion flow blower according to claim 1, characterized in that: The calibration area is located between the high voltage electrode plate (1) and the ground electrode plate (10), and is a three-dimensional space that is acted upon by both the electrostatic field component and the ion flow component.

3. The calibration system of the DC electric field measuring device of the ion flow blower according to claim 1, characterized in that: It also comprises a direct current power supply (4), the output end of which is connected to the high voltage plate (1) to provide an adjustable voltage for the high voltage plate (1).

4. The calibration system of the DC electric field measuring device of the ion flow blower according to claim 1, characterized in that: The DC electric field measurement module comprises a DC electric field measurement device (6) and a control terminal (7); the DC electric field measurement device (6) is arranged between the high voltage plate (1) and the grounding plate (10) and is used to measure the actual electric field strength in the calibration area.

5. A calibration method for a DC electric field measuring device of an ion flow blower, based on the calibration system for a DC electric field measuring device of an ion flow blower according to any one of claims 1 to 4, characterized in that: The following steps are involved: An ion blower device (2) is used to generate an ion flow, and a high-voltage electrode plate (1) and a grounding electrode plate (10) are combined to establish an electrostatic field and a controllable ion flow; Obtaining a current I on the Wilson plate (9), obtaining an ion current density J0 through the current I, and obtaining a theoretical mobility M1 through the ion current density J0; Using an ion mobility measuring device (3) to measure the ion mobility M0 in the calibration area; The theoretical mobility M1 is compared with the measured value M0. When M1 < M0, the ion generation amount of the ion blower device (2) is increased until M1 ≥ M0 is satisfied; When M1≥M0, the electric field strength E0 at the location where the DC electric field measurement module is located is obtained, and the calibration coefficient m of the DC electric field measurement module under the electric field is obtained to complete the single-point calibration; Adjust the voltage V of high voltage plate 1 T , get any voltage V after adjustment T , and obtain the full range calibration factor for the DC electric field.

6. The calibration method of the DC electric field measuring device of the ion flow blower according to claim 5, characterized in that: A method for obtaining a current I on a Wilson plate (9), obtaining an ion current density J0 through the current I, and obtaining a theoretical mobility M1 through the ion current density J0 comprises: The current I on the Wilson plate (9) with an area of ​​A0 is measured by the picoammeter 8. When the current value does not change, the current at this time is recorded as I0, so the ion current density J0 in the space is:

7. The calibration method of the DC electric field measuring device of the ion flow blower according to claim 6, characterized in that: The theoretical mobility Among them, V T is the voltage on the high-voltage plate, ε0 is the dielectric constant of vacuum; d is the gap distance between the high-voltage plate and the grounding plate.

8. The calibration method of the DC electric field measuring device of the ion flow blower according to claim 5, characterized in that: The electric field strength of the DC electric field measurement module Among them, V T is the voltage on the high-voltage plate, z is the distance between the point where the DC electric field measuring device is located and the high-voltage plate, and d / 2 is taken, where d is the gap distance between the plates.

9. The calibration method of the DC electric field measuring device of the ion flow blower according to claim 8, characterized in that: The calibration coefficient m of the DC electric field measurement module is E0 / E1 Wherein, E1 is the display value of the DC electric field measurement module.

10. The calibration method of the DC electric field measuring device of the ion flow blower according to any one of claims 5, characterized in that: Adjust the voltage V of the high voltage plate (2) T , get any voltage V after adjustment T The method for obtaining the full range calibration coefficient of the DC electric field includes: Selecting a set number of voltage point values ​​at equal intervals according to the measuring range of the DC electric field measurement module, and obtaining calibration coefficients corresponding to the selected voltage point values; The calibration coefficients corresponding to the selected voltage point values ​​are sorted to obtain the full-scale range calibration coefficients of the DC electric field.

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