A device and method for measuring the restitution coefficient of GIL metal particles colliding with an electrode

Abstract

The application discloses a kind of GIL metal particles and the collision recovery coefficient measuring device and measuring method of electrode, including metal cavity, particle falling device, flat plate electrode, high-speed camera device, high-voltage power supply.Metal cavity is closed cavity, can be inflated to simulate the gas atmosphere of GIL;Particle falling device is installed on the upper portion of metal cavity, and metal particles are contained in metal tray, and particles are released to GIL simulation device installed at the bottom of metal cavity by shaking metal tray, so that particles collide with electrodes;GIL simulation device is connected to high-voltage source through a sleeve, simulating the electric field environment of GIL;When metal particles collide with electrodes, high-speed camera shoots the trajectory of particle motion through observation window, and calculates the velocity and recovery coefficient of particle motion.Based on this, the recovery coefficient of metal particles colliding with GIL electrodes in GIL can be measured.The application also discloses a kind of collision recovery coefficient measuring method.

Description

TECHNICAL FIELD

[0001] The application relates to a GIL metal particle and electrode collision recovery coefficient measuring device and a measuring method, and belongs to the field of GIL internal particle recovery coefficient measurement. BACKGROUND

[0002] A gas insulated transmission line (GIL) using SF6 or SF6 / N2 mixed gas as insulating gas has a wide application prospect in high-drop, difficult land acquisition and complex cross-span transmission occasions due to its advantages of large transmission capacity, low loss, environmental friendliness and low maintenance cost. A certain amount of metal particles will inevitably be generated in the production and manufacturing process of the GIL and in the equipment operation process. The metal particles will move in the equipment or adhere to the surface of the electrode or insulator under the action of the electric field force, thereby causing the air gap breakdown between the conductor and the shell or the surface flashover of the insulator, and reducing the insulation performance of the equipment. Therefore, particle traps, electrode coating and other particle suppression measures are adopted in the GIL equipment.

[0003] The particles collide with the electrode, the insulator and other structures during the movement in the GIL, especially in the DC GIL, the collision movement of the particles is more intense. In the design of the particle traps, the electrode coating and other particle suppression measures, the collision process of the particles with the electrode, the insulator and the trap needs to be considered, and the collision recovery coefficient is a key parameter in the collision process of the particles, therefore, the collision recovery coefficient of the particles with the electrode in the GIL needs to be measured, and the temperature rise effect generated during the operation of the GIL needs to be considered. Based on the above background technology, the application provides a GIL metal particle and electrode collision recovery coefficient measuring device and a measuring method. SUMMARY

[0004] The application aims at the collision of the metal particles in the GIL system, and provides a device for measuring the collision recovery coefficient of the metal particles with the electrode when the actual GIL system is normally operated, and also provides a collision recovery coefficient measuring method. In order to achieve the above purpose, the application adopts the following technical scheme:

[0005] The application discloses a GIL metal particle and electrode collision recovery coefficient measuring device and a measuring method.

[0006] A GIL insulator collision recovery coefficient measuring platform considering temperature influence, characterized in that it comprises a metal cavity, a particle falling device, a GIL simulation device, a high-speed camera device and a voltage applying device.

[0007] The metal cavity is a closed cavity, and first and second observation windows are arranged on the two sides of the metal cavity shell; the metal cavity is inflated and deflated through a gas valve, the gas valve comprises a gas outlet and a gas inlet, a gas cylinder is connected to the gas inlet through a hose, the metal cavity can be inflated to simulate the gas environment in the GIL, and a sealing plug is arranged on the upper part of the cavity.

[0008] The particle falling device comprises a metal connecting rod, a metal tray and metal particles; the metal connecting rod penetrates through the sealing plug, the metal tray is arranged below the connecting rod, and the metal particles are placed above the tray; the metal connecting rod is lightly touched to shake off the metal particles in the tray.

[0009] The GIL simulation device comprises a high-voltage electrode, a ground electrode, a high-voltage lead, a grounding wire and an insulating support; the high-voltage electrode and the ground electrode are fixed to the bottom of the metal cavity through the insulating support; the high-voltage electrode applies voltage through the high-voltage lead, and the ground electrode is connected to the metal cavity shell through the grounding wire and grounded.

[0010] The high-speed camera device comprises a high-speed camera, a computer and a fill-in light; when the metal particles fall to the insulator and collide, the high-speed camera shoots the collision movement process of the particles through the second observation window, the fill-in light fills in light through the first observation window to enhance the imaging quality; after shooting, the shooting data of the high-speed camera is transmitted to the computer to calculate the speed and recovery coefficient of the particles when colliding with the insulator.

[0011] The voltage applying device comprises a high-voltage power supply, a wire and a high-voltage sleeve; the high-voltage power supply is connected to the high-voltage sleeve through the wire, and applies voltage to the GIL simulation device through the high-voltage lead.

[0012] The metal cavity shell material is aluminum alloy, and the length, width and height are 400mm, 400mm and 800mm respectively, the wall thickness is 10mm, and the pressure that can be borne is 0.5Mpa; the first observation window and the second observation window are organic transparent glass, the radius is 75mm, and the thickness is 15mm.

[0013] The metal particles are aluminum spherical particles, and the particle radius represents different sizes of particles generated in the GIL.

[0014] The high-voltage electrode and the ground electrode are coaxial cylindrical structures made of aluminum alloy; the radius of the high-voltage electrode is 20mm, and the inner radius of the ground electrode is 60mm, and the wall thickness is 5mm.

[0015] The high-voltage power supply can apply a voltage of up to 300kV to the platform, and can provide long-term stable high-voltage direct current with a ripple coefficient of less than 0.3%.

[0016] The collision recovery coefficient measurement method comprises the following steps:

[0017] ① According to the required GIL internal particle size to be measured, the required metal particle radius is selected, and the metal particles are placed in the metal tray;

[0018] ② According to the required collision incident velocity to be measured, the metal connecting rod is moved up and down to adjust the height of the metal tray;

[0019] ③ The metal connecting rod is actuated, so that the metal particles fall into the GIL simulation device and collide with the high-voltage electrode and the ground electrode;

[0020] ④ The high-speed camera shoots the particle collision motion image, and transmits it to the computer for processing, calculates the particle velocity at different times, and obtains the particle collision recovery coefficient.

[0021] The device and method can simulate the actual GIL system, measure the velocity recovery coefficient of the particles colliding with the electrode, are simple and effective, easy to implement, solve the problem of measuring the collision recovery coefficient of the particles and the electrode in the running GIL, provide a reference for further designing the structure or size of the particle trap and other particle suppression measures, and have important significance for the safe and reliable operation of the GIL. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 (a) is a schematic structural view (front view) of the device.

[0023] Figure 1 (b) is a schematic structural view (side view) of the device. DETAILED DESCRIPTION

[0024] The metal cavity is a closed cavity, and first and second observation windows are arranged on the two sides of the metal cavity shell; the metal cavity is inflated through a gas valve, and the gas valve comprises a gas outlet and a gas inlet; the gas cylinder is connected to the gas inlet through a hose, so that the metal cavity can be inflated to simulate the gas environment in the GIL; a sealing plug is arranged on the upper part of the cavity.

[0025] The particle falling device comprises a metal connecting rod, a metal tray and metal particles; the metal connecting rod penetrates through the sealing plug, and the metal tray is arranged below the connecting rod; the metal particles are placed on the tray; the metal connecting rod can shake off the metal particles in the tray.

[0026] The GIL simulation device comprises a high-voltage electrode, a ground electrode, a high-voltage lead, a grounding wire and an insulating support; the high-voltage electrode and the ground electrode are fixed to the bottom of the metal cavity through the insulating support; the high-voltage electrode applies voltage through the high-voltage lead, and the ground electrode is connected to the metal cavity shell through the grounding wire and grounded.

[0027] The high-speed camera device comprises a high-speed camera, a computer and a fill light; when the metal particles fall onto the insulator and collide, the high-speed camera captures the collision process of the particles through the second observation window; the fill light provides light through the first observation window to enhance the imaging quality; after the shooting is completed, the shooting data of the high-speed camera is transmitted to the computer to calculate the speed and the recovery coefficient of the particles when colliding with the insulator.

[0028] The voltage application device comprises a high-voltage power supply, a wire and a high-voltage sleeve; the high-voltage power supply is connected to the high-voltage sleeve through the wire, and applies voltage to the GIL simulation device through the high-voltage lead.

[0029] The high-voltage power supply can apply a voltage of up to 300kV to the platform and provide long-term stable high-voltage direct current with a ripple coefficient of less than 0.3%. In this experiment, the high voltage is 110kV, 220kV and 280kV.

[0030] The metal cavity shell is made of aluminum alloy, and the length, width and height are 400mm, 400mm and 800mm respectively, and the wall thickness is 10mm, which can withstand a gas pressure of 0.5Mpa; the first and second observation windows are made of organic transparent glass, and the radius is 75mm and the thickness is 15mm.

[0031] The metal particles are aluminum spherical particles, and the particle radius represents different sizes of particles generated in the GIL. In this experiment, 100 particles with a radius of 0.1mm, 0.3mm, 0.5mm, 0.7mm and 1mm are used.

[0032] The high-voltage electrode and the ground electrode are coaxial cylindrical structures made of aluminum alloy.

[0033] The high-voltage electrode has a radius of 20mm, the ground electrode has an inner radius of 60mm, and a wall thickness of 5mm.

[0034] The method for measuring the collision recovery coefficient includes the following steps;

[0035] ① Select the required metal particle radius based on the particle size of the internal GIL to be measured, and place the metal particles on the metal tray.

[0036] ② Adjust the height of the metal tray by moving the metal connecting rod up and down according to the required impact incident velocity;

[0037] ③ Move the metal connecting rod to make the metal particles fall into the GIL simulation device and collide with the high voltage electrode and the ground electrode;

[0038] ④ A high-speed camera captures images of particle collision motion and transmits them to a computer for processing. The velocity of the particles at different times is calculated to obtain the particle collision recovery coefficient.

[0039] This implementation plan conducts an effectiveness experiment on the measurement of the collision recovery coefficient of GIL insulators, taking into account the influence of temperature. In the experiment, spherical metal particles of different radii were used, and 10 experiments were conducted under various voltage levels, following the measurement method described above. Through this experimental procedure, the collision recovery coefficient between the metal particles and the electrode under various experimental conditions was obtained, and finally, its value was statistically calculated using empirical methods.

[0040] The above-described embodiments are merely one implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this invention should be determined by the appended claims.

Claims

1. A device for measuring the coefficient of restitution of GIL metal particles colliding with an electrode, characterized in that, It comprises a metal cavity (1), a particle falling device (2), a GIL simulation device (3), a high-speed camera device (4) and a voltage application device (5). The metal cavity (1) is a closed cavity, and a first observation window (12) and a second observation window (13) are arranged on the two sides of the metal cavity shell (11) respectively; the metal cavity (1) is inflated through a gas valve (14), and the gas valve (14) comprises a gas outlet (141) and a gas inlet (142); a gas cylinder (15) is connected to the gas inlet (142) through a hose (16), so that the metal cavity (1) can be inflated to simulate the gas environment in the GIL; a sealing plug (17) is arranged on the upper part of the cavity. The particle falling device (2) comprises a metal connecting rod (21), a metal tray (22) and metal particles (23); the metal connecting rod (21) penetrates through the sealing plug (17), and the metal tray (22) is arranged below the connecting rod; the metal particles (23) are placed above the tray; the metal particles (23) in the tray are shaken off by tapping the metal connecting rod (21). The GIL simulation device (3) comprises a high-voltage electrode (31), a ground electrode (32), a high-voltage lead (33), a grounding wire (34) and an insulating support (35); the high-voltage electrode (31) and the ground electrode (32) are fixed to the bottom of the metal cavity (1) through the insulating support (35); the high-voltage electrode (31) applies voltage through the high-voltage lead (33), and the ground electrode (32) is connected to the metal cavity shell (11) through the grounding wire (34) and grounded. The high-speed camera device (4) comprises a high-speed camera (41), a computer (42) and a fill light (43); when the metal particles (23) fall between the high-voltage electrode (31) and the ground electrode (32) and collide, the high-speed camera (41) photographs the collision process of the particles through the second observation window (13), and the fill light (43) provides light through the first observation window (12) to enhance the imaging quality; after the photographing is completed, the photographing data of the high-speed camera (41) is transmitted to the computer (42) to calculate the speed and the restitution coefficient of the particles when colliding with the electrode. The voltage application device (5) comprises a high-voltage power supply (51), a wire (52) and a high-voltage sleeve (53); the high-voltage power supply (51) is connected to the high-voltage sleeve (53) through the wire (52), and applies voltage to the GIL simulation device (3) through the high-voltage lead (33).

2. The GIL metal particle and electrode collision restitution coefficient measuring device according to claim 1, characterized by, The metal cavity shell (11) is made of aluminum alloy, and has a length of 400 mm, a width of 400 mm, a height of 800 mm and a wall thickness of 10 mm, and can withstand a gas pressure of 0.5 Mpa; the first observation window (12) and the second observation window (13) are made of organic transparent glass, have a radius of 75 mm and a thickness of 15 mm.

3. The GIL metal particle and electrode collision restitution coefficient measuring device according to claim 1, characterized by, The metal particles (23) are aluminum spherical particles, and the particle radius represents different sizes of particles generated in the GIL.

4. The GIL metal particle and electrode collision restitution coefficient measuring device according to claim 1, characterized by, The high-voltage electrode (31) and the ground electrode (32) have a coaxial cylindrical structure and are made of aluminum alloy; the high-voltage electrode (31) has a radius of 20 mm, and the ground electrode (32) has an inner radius of 60 mm and a wall thickness of 5 mm.

5. The GIL metal particle and electrode collision restitution coefficient measuring device according to claim 1, characterized by, The high-voltage power supply (51) can apply a voltage of up to 300 kV to the platform and stably provide high-voltage direct current with a ripple coefficient of less than 0.3% for a long time.

6. A GIL metal particle and electrode collision restitution coefficient measuring device according to any one of claims 1 to 5, a collision restitution coefficient measuring method is proposed, characterized by, The collision restitution coefficient measurement method comprises the following steps: ①According to the required GIL internal particle size to be measured, select the required metal particle (23) radius, and place the metal particle (23) on the metal tray (22); ②According to the required collision incident velocity to be measured, move the metal connecting rod (21) up and down to adjust the height of the metal tray (22); ③Turn the metal connecting rod (21) to make the metal particle (23) fall on the GIL simulation device (3) and collide with the high-voltage electrode (31) and the ground electrode (32); ④The high-speed camera (41) shoots the particle collision motion image and transmits it to the computer (42) for processing, calculates the particle motion speed at different times, and obtains the particle collision restitution coefficient.

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