All-fiber charge kinetic energy perception device

Abstract

The application discloses a kind of all-fiber charge kinetic energy sensing device, including dynamic charge collection array and corona discharge generator connected together by docking channel.The all-fiber charge kinetic energy sensing device provided by the application has the advantages of fast response, high precision, simple production and detachability, can accurately and effectively measure the impact stress generated by charge carrying kinetic energy on the surface of insulating material, and realize passive sensing of corona discharge position.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of charge kinetic energy measurement, and relates to a full-fiber charge kinetic energy sensing device. BACKGROUND

[0002] Corona discharge is a kind of local self-sustaining discharge, which is prone to occur on the surface of high-voltage equipment, can accelerate the aging of insulating materials, and further affect the stable operation of the power system. Corona discharge can produce a large amount of charges carrying micro kinetic energy, which not only causes chemical corrosion of insulating materials, but also causes continuous impact stress corrosion on the surface of the materials. Each impact is like a micro bomb, which explosively releases kinetic energy.

[0003] In order to ensure the accurate, reliable and effective operation of high-voltage insulating equipment, it is necessary to detect corona discharge and measure the kinetic energy carried by the charges. The existing measuring equipment can find the position of corona discharge, but cannot accurately measure the impact stress on the surface of insulating materials caused by charges carrying kinetic energy. SUMMARY

[0004] The purpose of the application is to provide a full-fiber charge kinetic energy sensing device, which can measure the impact stress on the surface of insulating materials caused by charges carrying micro kinetic energy, and also realize passive sensing of the position of corona discharge.

[0005] The technical scheme adopted by the application is a full-fiber charge kinetic energy sensing device, which comprises a dynamic charge collection array and a corona discharge generator connected together through an interfacing channel.

[0006] The application has the following characteristics:

[0007] The dynamic charge collection array comprises an array support, the interfacing channel is located at the center of the array support, the interfacing channel has a circular structure, and five shuttle holes of the same size are uniformly distributed in the area where the interfacing channel is located; an array base is arranged above the area where the interfacing channel is located, five array positioning holes of the same size are uniformly distributed on the array base, the positions of the five array positioning holes and the five shuttle holes correspond to each other exactly, and five charge kinetic energy sensors are respectively arranged on the five array positioning holes.

[0008] Each charge kinetic energy sensor comprises a hollow cylindrical coupling fixing frame, a positioning block is laser welded in the coupling fixing frame, a lower optical coupler is arranged at the center of the positioning block in the vertical direction, an optical signal delivery channel is arranged at the center of the lower optical coupler, a charge kinetic energy sensing film is arranged on the upper end face of the coupling fixing frame in the horizontal direction, an upper coupling film is plated on the lower surface of the charge kinetic energy sensing film, and the optical signal delivery channel is connected with an optical signal collection and processing system through the shuttle hole.

[0009] The shape and size of the coupling fixing frame are matched with the size of the array positioning hole; the shape and size of the lower optical coupler are matched with the size of the positioning block; and the lower optical coupler and the upper coupling film form an optical coupling cavity.

[0010] The charge kinetic energy sensing film is a polyimide film.

[0011] The charge kinetic energy sensor can detect the impact stress generated by the charge carrying micro kinetic energy on the surface of the insulating material, and convert the impact stress signals at different positions into optical signals. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a cross-sectional view of the all-fiber charge kinetic energy sensing device of the present application;

[0013] Figure 2 is a three-dimensional schematic diagram of the dynamic charge collection array in the all-fiber charge kinetic energy sensing device of the present application;

[0014] Figure 3 is a three-dimensional schematic diagram of the array support of the dynamic charge collection array in the all-fiber charge kinetic energy sensing device of the present application;

[0015] Figure 4 is a three-dimensional schematic diagram of the array base of the dynamic charge collection array in the all-fiber charge kinetic energy sensing device of the present application;

[0016] Figure 5 is a cross-sectional view of the charge kinetic energy sensor in the all-fiber charge kinetic energy sensing device of the present application;

[0017] Figure 6 is an output waveform diagram of the five charge kinetic energy sensing tests in the all-fiber charge kinetic energy sensing device of the present application;

[0018] Figure 7 is an electric field simulation diagram of the corona discharge in the all-fiber charge kinetic energy sensing device of the present application.

[0019] In the figure, 1. Array support, 2. Array base, 3. Charge kinetic energy sensor I, 4. Shuttle hole, 5. Optical signal delivery channel, 6. Optical signal acquisition and processing system, 7. Docking channel, 8. Anti-static transparent isolation cover, 9. Rotary propeller, 10. Dynamic charge generator, 11. Array positioning hole, 12. Coupling fixing frame, 13. Positioning block, 14. Lower optical coupler, 15. Charge kinetic energy sensing film, 16. Upper coupling film, 17. Charge kinetic energy sensor II, 18. Charge kinetic energy sensor III, 19. Charge kinetic energy sensor IV, 20. Charge kinetic energy sensor V, 21. Zero potential body. DETAILED DESCRIPTION

[0020] The application will be described in detail below in combination with the drawings and specific embodiments.

[0021] The all-fiber charge kinetic energy sensing device of the application, as shown in the figure, comprises a dynamic charge collection array and a corona discharge generator. Figure 1

[0022] As shown in the figure, the dynamic charge collection array is composed of an array support 1, an array base 2 and charge kinetic energy sensors; Figure 2

[0023] As shown in the figure, the array support 1 has five shuttle holes 4 of the same size, which are distributed according to the center point and four vertices of a square, wherein the shuttle hole at the center point position is located at the center of the array support 1; the docking channel 7 is outside the five shuttle holes 4, and the center of the circle is at the center of the array support 1. Figure 3

[0024] As shown in the figure, the array base 2 has five array positioning holes 11 of the same size, and the positions of the five array positioning holes 11 correspond to those of the five shuttle holes 4; five identical charge kinetic energy sensors (charge kinetic energy sensor I 3, charge kinetic energy sensor II 17, charge kinetic energy sensor III 18, charge kinetic energy sensor IV 19, charge kinetic energy sensor V 20) are respectively fitted above the array positioning holes 11, and the optical signal delivery channel 5 of each charge kinetic energy sensor is connected to the optical signal acquisition and processing system 6 after passing out of the shuttle hole 4. Figure 4

[0025] As shown in the figure, the array support 1 has five shuttle holes 4 of the same size, which are distributed according to the center point and four vertices of a square, wherein the shuttle hole at the center point position is located at the center of the array support 1; the docking channel 7 is outside the five shuttle holes 4, and the center of the circle is at the center of the array support 1. Figure 5 ​​​​As shown, the charge kinetic energy sensor I3, the charge kinetic energy sensor II 17, the charge kinetic energy sensor III 18, the charge kinetic energy sensor IV 19, and the charge kinetic energy sensor V 20 have the same structure, and each includes a light signal delivery channel 5, a coupling fixing frame 12, a positioning block 13, a lower optical coupler 14, a charge kinetic energy sensing film 15, and an upper coupling film 16. The coupling fixing frame 12 has a radius of 9-11 mm and a height of 13-15 mm, and is matched in size with the array positioning hole 11. The lower optical coupler 14 has a radius of 2.4-2.6 mm and a height of 8-10 mm, and is matched in size with the positioning block 13, and is wrapped around the light signal delivery channel 5. The charge kinetic energy sensing film 15 is a polyimide film with a radius of 9-11 mm and a thickness of 0.1-0.3 mm. The lower surface of the charge kinetic energy sensing film 15 is optically processed to be coated with the upper coupling film 16 having a reflectivity of 85%-98%, and is connected to the top of the coupling fixing frame 12 made of epoxy resin by laser welding. The lower optical coupler 14 wrapped around the light signal delivery channel 5 is inserted from the lower positioning block 13 of the coupling fixing frame 12, and is optically coupled with the upper coupling film 16. The side surface of the lower optical coupler 14 is sealed by uniformly applying epoxy resin glue, and the tail end is fixed by laser welding, so that the lower optical coupler 14 and the upper coupling film 16 form a light coupling cavity with air as the medium and a gap of 3-5 mm. The light signal delivery channel 5 is connected to the optical signal acquisition and processing system 6.

[0026] The dynamic charge collection array and the corona discharge generator are connected into a whole through the docking channel 7. The corona discharge generator includes an anti-static transparent isolation cover 8, a rotating propeller 9, and a dynamic charge generator 10. The anti-static transparent isolation cover 8 has a rotating hole with internal threads at the center of the top of the cylinder, and the thickness and outer diameter of the cylinder wall are matched with the docking channel 7. The outer threads of the lower end column of the rotating propeller 9 are matched with the internal threads of the top of the cylinder of the anti-static transparent isolation cover 8. The dynamic charge generator 10 is fixed in the central hole of the rotating propeller 9, and the height of the dynamic charge generator 10 from the dynamic charge collection array can be changed by rotating the rotating propeller 9. The array support 1, the anti-static transparent isolation cover 8, and the rotating propeller 9 are all made of transparent and anti-static acrylic glass.

[0027] The five charge kinetic energy sensors on the dynamic charge collection array can be regarded as five optical detection points. The optical detection point I represented by the charge kinetic energy sensor I3 is in the central position, the optical detection point II represented by the charge kinetic energy sensor II 17 is above the optical detection point I, the optical detection point III represented by the charge kinetic energy sensor III 18 is below the optical detection point I, the optical detection point IV represented by the charge kinetic energy sensor IV 19 is to the left of the optical detection point I, and the optical detection point V represented by the charge kinetic energy sensor V 20 is to the right of the optical detection point I. The distance between the optical detection point I and the optical detection points II, III, IV, and V is 4-6 mm.

[0028] The corona discharge generates a large number of charges carrying micro kinetic energy, and the micro deformation of the charge kinetic energy sensing film 15 caused by the impact of the charges can convert the impact stress signal of the charges into an optical signal, and the position of the corona discharge can be determined according to the sensing results of each optical detection point on the dynamic charge collection array; in order to block the influence of the gas flow on the sensing results, the generation, impact and sensing of the dynamic charges are all carried out in the anti-static transparent isolation cover 8.

[0029] The method for using the all-fiber charge kinetic energy sensing device is as follows: when used, first, connect the array base 2 to the electrode, and install the center of the array support 1 so that the array positioning hole 11 and the shuttle hole 4 are in position correspondence; then, fit the charge kinetic energy sensor I 3, the charge kinetic energy sensor II 17, the charge kinetic energy sensor III 18, the charge kinetic energy sensor IV 19, and the charge kinetic energy sensor V 20 above the array positioning hole 11, and the optical signal delivery channel 5 of each charge kinetic energy sensor is connected to the optical signal collection and processing system 6 through the shuttle hole 4; then, connect the corona discharge generator and the dynamic charge collection array through the docking channel 7 to form a whole, adjust the vertical height of the dynamic charge generator 10 from the dynamic charge collection array by rotating the rotary propeller 9; finally, connect the tail of the dynamic charge generator 10 to the high-voltage direct-current power supply, and the charge kinetic energy sensing test of the corona discharge can be carried out.

[0030] The working principle of the all-fiber charge kinetic energy sensing device is as follows: the charges generated by the corona discharge carry micro kinetic energy, and when the charges impact on the upper surface of the charge kinetic energy sensing film 15, the film will be deformed, causing the gap of the optical coupling cavity to change, and the relationship between the change amount Δh of the gap and the deformation amount ΔL of the charge kinetic energy sensing film 15 after demodulation by the optical signal collection and processing system 6 is as follows:

[0031]

[0032] In the formula, d is the thickness of the charge kinetic energy sensing film 15.

[0033] The relationship between the stress F generated by the charge impact and the change amount Δh of the gap of the optical coupling cavity is as follows:

[0034]

[0035] In the formula, r, E and μ are the radius, Young's modulus and Poisson's ratio of the charge kinetic energy sensing film 15, respectively.

[0036] Example 1

[0037] The access voltage of the dynamic charge generator 10 is set to 8kV, the charge impact distance is set to 5mm, and the gap change waveform diagram as shown in Figure 6 is obtained.Figure 6 The detection waveforms from top to bottom correspond to optical detection points II, III, I, IV, and V, respectively. When there is no charge impact, the waveform tends to be stable. After being impacted by the charge, the waveform first rises rapidly and then tends to be stable, forming a demodulated gap change Δh. The impact stress F generated by the charge impact on the charge kinetic energy sensing film 15 can be calculated by combining formula (2).

[0038] The experimental measurement of the gap change Δh of the optical coupling cavity of optical detection point II is 127.8 pm, and the impact stress F is 4.6×10 -4 N; the Δh of optical detection point III is 132.3 pm, and the F is 4.7×10 -4 N; the Δh of optical detection point I is 208.4 pm, and the F is 7.9×10 -4 N; the Δh of optical detection point IV is 129.4 pm, and the F is 4.6×10 -4 N; the Δh of optical detection point V is 104.7 pm, and the F is 3.7×10 -4 N. From the above experimental data, it can be seen that each charge carrying micro kinetic energy generates relatively small impact stress on the charge kinetic energy sensing film 15, but continuous long-time charge impact will continuously superimpose the kinetic energy of the charge, thereby generating a large impact stress on the surface of the insulating material and causing serious stress corrosion.

[0039] The simulation experiment diagram of the corona discharge electric field with the physical field as the electrostatic field and the input voltage as 8 kV is shown in Figure 7 The entire process follows the law of charge conservation, and the relationship between the electric field strength and the potential is:

[0040]

[0041]

[0042] In the formula: is the electrostatic displacement, the electric field strength, V is the potential, and ρ v is the potential density; the simulation measurement of the electric field strength at 5 mm below the dynamic charge generator 10 is 2.0×10 5 V / m.

Claims

1. An all-fiber charge kinetic energy perception device, characterized by: The device comprises a dynamic charge collection array and a corona discharge generator connected together through a docking channel (7); The dynamic charge collection array comprises an array support (1), and the docking channel (7) is located at the center of the array support (1) and has a circular structure, and five shuttle holes (4) of the same size are uniformly distributed in the area where the docking channel (7) is located; an array base (2) is arranged above the area where the docking channel (7) is located, and five array positioning holes (11) of the same size are uniformly distributed on the array base (2), the positions of the five array positioning holes (11) and the five shuttle holes (4) correspond to each other exactly, and five charge kinetic energy sensors are respectively arranged on the five array positioning holes (11); Each charge kinetic energy sensor comprises a hollow cylindrical coupling fixing frame (12), a positioning block (13) is laser welded inside the coupling fixing frame (12), a lower optical coupler (14) is arranged at the center of the positioning block (13) in the vertical direction, an optical signal delivery channel (5) is arranged at the center of the lower optical coupler (14), a charge kinetic energy sensing film (15) is arranged on the upper end face of the coupling fixing frame (12) in the horizontal direction, an upper coupling film (16) is plated on the lower surface of the charge kinetic energy sensing film (15), and the optical signal delivery channel (5) is connected with an optical signal collection and processing system (6) through the shuttle hole (4).

2. The all-fiber charge kinetic energy perception device of claim 1, wherein: The shape and size of the coupling fixing frame (12) are matched with the size of the array positioning hole (11); the shape and size of the lower optical coupler (14) are matched with the size of the positioning block (13); and a light coupling cavity is formed between the lower optical coupler (14) and the upper coupling film (16).

3. The all-fiber charge kinetic energy perception device of claim 2, wherein: The charge kinetic energy sensing film (15) is selected from an insulating polyimide film, and charge kinetic energy sensing films of different thicknesses and Young's moduli can be replaced according to different discharge voltage grades.

Images