An efficient test device for a high-voltage circuit breaker

Abstract

The present invention discloses an efficient testing device for high-voltage circuit breakers, comprising an operating mechanism box, a spring operating mechanism movably mounted in the operating mechanism box, and an electrically controlled operating mechanism fixedly mounted below the operating mechanism box and transmission-connected to the spring operating mechanism. A magnetorheological fluid in a corrugated square tube is squeezed into a telescopic rod, which is extended to bend a memory metal sheet. The distance between the bent and deformed memory metal sheet and the stationary and moving contacts is smaller than the distance between the stationary and moving contacts. When vacuum is broken, irregular point-contact spirally focused arcs are generated between the stationary and moving contacts, contacting and flowing with the memory metal sheet. The arc then flows through the memory metal sheet into the sides of the stationary and moving contacts, preventing the arc from forming a point-contact focused arc on the surfaces of the stationary and moving contacts and generating a molten crater, thereby preventing the arc from forming a concentrated arc column in the molten crater.

Description

Technical Field

[0001] The present invention relates to the field of circuit breaker equipment, and particularly to an efficient test device for a high-voltage circuit breaker. Background Technique

[0002] The efficient test device for a high-voltage circuit breaker is a device used to test and evaluate the performance of a high-voltage circuit breaker. Through this device, comprehensive tests can be carried out on the electrical performance, insulation performance, breaking capacity, closing capacity, etc. of the circuit breaker to ensure that the circuit breaker can work stably and reliably during use. At the same time, through the test device, load switch tests, short-circuit tests, over-voltage tests, etc. are carried out on the circuit breaker to verify its performance under various working conditions, providing a reference basis for the selection and design of the equipment. Testing through the efficient test device can improve the performance and reliability of the circuit breaker and ensure the safe operation of the power system.

[0003] In the experiment of a mechanical high-voltage circuit breaker, it is necessary to continuously open and close in the vacuum interrupter to simulate various current and voltage circuit conditions. During the continuous opening and closing process, the frequent movement of the moving contact is likely to cause external air to enter the interrupter and destroy the vacuum degree, resulting in a decline in the arc extinguishing performance. At this time, during the closing process, an arc will be generated between the moving and static contacts in the vacuum interrupter. When the arc currents on the moving and static contacts attract each other and the metal bridge between the contacts is relatively long, an irregularly moving point-contact type aggregated arc will be formed on the contacts. At the same time, due to the large resistance of the point-contact type arc on the contact surface, the temperature is high, and high-temperature metal vapor will be generated due to the high-temperature melting of the contact surface, resulting in a melting pit. When closing, the arc changes from point contact to surface contact, and the point-contact type aggregated arc will form a surface-contact type aggregated arc column. This form of arc is difficult to extinguish in the melting pit, which further aggravates the burning of the contacts and reduces the service life of the contacts and the vacuum interrupter (a large amount of metal vapor generated by the burning of the contacts will splash onto the shielding equipment in the vacuum interrupter, increasing the heat dissipation burden on the shielding cover in the vacuum interrupter, and at the same time increasing the temperature of the insulating shell, resulting in a decline in the performance of the insulating material and increasing the risk of insulation breakdown, thereby affecting the overall insulation effect of the vacuum interrupter), thus affecting subsequent high-voltage experiments.

[0004] Therefore, an efficient test device for a high-voltage circuit breaker is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an efficient test device for a high-voltage circuit breaker to solve the problem proposed in the above background technique that when closing, the arc changes from point contact to surface contact, and the point-contact type aggregated arc will form an aggregated arc column. This form of arc is difficult to extinguish in the melting pit, which further aggravates the burning of the contacts and reduces the service life of the contacts and the vacuum interrupter.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A high-efficiency test device for a high-voltage circuit breaker comprises an operating mechanism box and a spring operating mechanism movably mounted in the operating mechanism box, and an electric control mechanism fixedly mounted below the operating mechanism box and transmission-connected to the spring operating mechanism. A mounting platform is fixedly mounted on one side of the operating mechanism box and the electric control mechanism, and a vacuum arc extinguishing tube is provided above the mounting platform. A static contact is provided above the inner side of the vacuum arc extinguishing tube, and a moving contact is provided below the static contact. Fixed rods are fixedly mounted equidistantly around the inner side of the vacuum arc extinguishing tube. Fixed support plates are fixedly mounted between and below the fixed rods, and an air duct is provided through one side of the fixed support plates. An extrusion plate is provided above the fixed support plates, and the extrusion plates are each mounted in an inward position on the inner side of the fixed rods.

[0008] The inner side of the extrusion plate is movably mounted with a corrugated square tube, and a dial plate is fitted below the corrugated square tube and is movably mounted on the inner side of the extrusion plate. Spring members are fixedly mounted on both sides of the dial plate, and a dial piece is fixedly mounted on one side of the spring member and is mounted in the dial plate. A slot is provided on both sides of the dial piece.

[0009] A limiting slide is provided above the extrusion plate, and the limiting slides are all embedded and installed on the inner side of the fixed rod. A memory metal sheet is movably embedded and installed below one side of the limiting slide, and the thickness of the memory metal sheet is set to decrease in sequence on the limiting slide. Electromagnetic sliding rods are fixedly installed at the four corners of one side of the memory metal sheet, and the electromagnetic sliding rods are all embedded and movably installed on the inner side of the limiting slide. A telescopic rod is provided in the middle of the electromagnetic sliding rod, and one side of the telescopic rod is fixedly installed on the inner side of the limiting slide, and the other side is fitted with one side of the electromagnetic sliding rod.

[0010] In the above scheme, preferably: an inert gas tank is provided above the limiting slide plate, and the inert gas tank is fixedly installed above the interior of the vacuum arc extinguishing tube, a slide plate is fixedly installed on one side of the inert gas tank, and an opening and closing slide is movably installed in the slide plate.

[0011] In the above scheme, preferably: a nozzle is installed through the middle of the slide plate, and one side of the opening and closing slide is attached to the inner side of the nozzle, one side of the slide plate is connected through a corrugated tube, and the corrugated tube is embedded in the inner side of the limiting slide, magnetorheological fluid is provided in the corrugated square tube, and the magnetorheological fluid is connected in series with the slide plate, telescopic rod and corrugated square tube through the corrugated tube and filled.

[0012] In the above solution, preferably: ventilation holes are provided inside the dial plate, and the ventilation holes are communicated with the ventilation channels on the fixed support plate through the limit slide plates. A bead groove is fixedly installed inside the dial plate, and a spring bead is provided inside the bead groove, and the spring bead is movably connected in an engaged manner with the card slot.

[0013] In the above solution, preferably: a fixed partition is fixedly installed on one side of the operating mechanism box, and a plurality of insulating baffles are fixedly installed on one side of the fixed partition. A fixed bracket is provided between the insulating baffles, and the fixed bracket is fixedly installed on the fixed partition.

[0014] In the above solution, preferably: an opening and closing lifting rod is provided below the fixed partition, and the opening and closing lifting rod is movably connected in an engaged manner with the operating mechanism box through the inside of the fixed partition. An insulating bracket is fixedly installed on one side above the mounting frame table, and a fixed support rod is fitted and installed inside the insulating bracket, and the opening and closing lifting rod is movably connected in an engaged manner with the fixed support rod.

[0015] In the above solution, preferably: a moving voltage rod is movably connected in an engaged manner inside the opening and closing lifting rod. A connecting shaft is fitted and installed below the moving voltage rod, and the moving voltage rod is movably connected in an engaged manner with the opening and closing lifting rod through the connecting shaft. A static voltage rod is fixedly installed below the fixed bracket, and electric connection plates are fixedly installed on both the static voltage rod and the moving voltage rod.

[0016] In the above solution, preferably: the static contact is fixedly installed below the static voltage rod, the moving contact is fixedly installed above the moving voltage rod, and a dial rod is provided below the moving contact, and the dial rods are fixedly installed equidistantly above the moving voltage rod.

[0017] In the above solution, preferably: disc-shaped grooves are provided in the middle of the surfaces of both the static contact and the moving contact, and arc grooves are provided on both the static contact and the moving contact in an equidistant and surrounding manner.

[0018] The present invention provides an efficient test device for a high-voltage circuit breaker, which has the following technical key points and beneficial effects:

[0019] 1. The present invention designs structures such as a dial plate, a dial piece, and a dial rod. The contact between the dial rod and the dial piece drives the dial plate to slide upward in the extrusion plate, so as to extrude the corrugated square tube in the extrusion plate, and then squeeze the magnetorheological fluid in the corrugated square tube into the telescopic rod, causing the telescopic rod to extend and bend the shape memory alloy sheet. At this time, the distance between the bent shape memory alloy sheet and the static contact and the moving contact is less than the distance between the static contact and the moving contact. When the vacuum is destroyed, the point-contact spiral-aggregated arc that moves irregularly between the static contact and the moving contact contacts and conducts electricity with the shape memory alloy sheet respectively. At this time, the arc flows into the sides of the static contact and the moving contact through the shape memory alloy sheet, so as to prevent the arc from forming a point-contact aggregated arc on the surfaces of the static contact and the moving contact to generate a melting pit, and further avoid the aggregated arc column of the arc in the melting pit.

[0020] 2. The present invention designs structures such as an inert gas tank, a chute plate, and an opening and closing slide piece. The magnetorheological fluid is used to push the opening and closing slide piece in the chute plate to slide, so that the opening on the opening and closing slide piece corresponds to the nozzle, and then the inert gas in the inert gas tank is ejected. At this time, the inert gas ejected from the inert gas tank will fill the vacuum interrupter, so as to prevent the generation of an arc during the opening and closing experiment. Secondly, the inert gas in the inert gas tank is a colored gas. After filling the vacuum interrupter, the colored inert gas is ejected from the joint between the dynamic voltage rod and the vacuum interrupter, forming an obvious visual warning for maintenance personnel to check and repair in time. At the same time, since the thickness of the shape memory alloy sheet decreases successively, there is a time difference when the shape memory alloy sheet completely returns to its initial state. Therefore, the inert gas ejected from the inert gas tank is a continuous process, so as to avoid the simultaneous ejection of the inert gas in the inert gas tank, which may cause the air pressure in the vacuum interrupter to be too high, resulting in a sudden increase in the internal pressure of the arc extinguishing chamber of the vacuum interrupter and affecting the safe operation of the equipment.

[0021] 3. The present invention designs structures such as a static contact and a moving contact. When the closing static contact and the moving contact are in contact, the high-voltage current flows through the disc-shaped groove to form a U-shaped ring circuit, so that the current moves radially towards the edge, avoiding the direct current concentration of the current and causing local overheating, so as to improve the service life of the contact. At the same time, through the arc groove on the moving contact, the current flows along the direction of the arc groove. At this time, the current in the arc groove is like a current-carrying solenoid coil generating a longitudinal magnetic field to form a spiral arc, which forms a conduction circuit with the shape memory alloy sheet. When the point-contact aggregated arc contacts and conducts electricity with the shape memory alloy sheet, the current passes through the shape memory alloy sheet to make the electromagnetic slide rod generate magnetism, so that the viscosity of the magnetorheological fluid changes under the action of the electromagnetic field, so as to stably maintain the extension of the telescopic rod, keep the shape memory alloy sheet bent, and then make the arc flow into the sides of the static contact and the moving contact through the shape memory alloy sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural schematic diagram of the present invention;

[0023] Figure 2 Schematic diagram of the overall back structure in the present invention;

[0024] Figure 3 Schematic diagram of the connection structure between the opening and closing lifting rod and the fixed bracket in the present invention;

[0025] Figure 4 Schematic diagram of the partial structure of the static contact and the moving contact in the present invention;

[0026] Figure 5 Schematic diagram of the connection structure between the static voltage rod and the moving voltage rod in the present invention;

[0027] Figure 6 Schematic diagram of the internal structure of the vacuum interrupter in the present invention;

[0028] Figure 7 Schematic diagram of the partial structure section of the vacuum interrupter in the present invention;

[0029] Figure 8 Schematic diagram of the installation structure of the fixed rod in the present invention;

[0030] Figure 9 Schematic diagram of the connection structure of the limit sliding plate in the present invention;

[0031] Figure 10 Schematic diagram of the partial structure of the inert gas tank in the present invention;

[0032] Figure 11 Schematic diagram of the partial structure of the shape memory alloy sheet in the present invention;

[0033] Figure 12 Schematic diagram of the partial structure of the extrusion plate in the present invention;

[0034] Figure 13 Schematic diagram of the connection structure between the corrugated square tube and the dial plate in the present invention;

[0035] Figure 14 Schematic diagram of the closing circuit of the static contact and the moving contact in the present invention;

[0036] Figure 15 Schematic diagram of the connection structure between the dial plate and the dial piece in the present invention;

[0037] Figure 16 In the present invention Figure 12 Schematic enlarged view of the partial structure at location A;

[0038] Figure 17 In the present invention Figure 13 Schematic enlarged view of the partial structure at location B.

[0039] In the figure: 1. operating mechanism box; 2. spring operating mechanism; 3. electric control mechanism; 4. mounting platform; 5. insulating baffle; 6. fixed partition; 7. fixed bracket; 8. vacuum arc extinguishing tube; 801. inert gas tank; 8011. slide plate; 8012. nozzle; 8013. opening and closing slide; 802. limit slide; 8021. memory metal sheet; 8022. corrugated conduit; 8023. telescopic rod; 8024. electromagnetic slide; 803. Extrusion plate; 8031, corrugated square tube; 8032, selector plate; 8033, spring member; 8034, selector; 8035, bead slot; 8036, slot; 804, fixed support plate; 805, fixed rod; 9, insulating bracket; 10, power board; 11, opening and closing lifting rod; 12, fixed support rod; 13, static voltage rod; 1301, static contact; 14, dynamic voltage rod; 1401, connecting shaft; 1402, dynamic contact; 1403, selector rod. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See also Figures 1 to 17 The present invention provides a technical solution for an efficient test device for a high-voltage circuit breaker:

[0042] A high-efficiency test device for a high-voltage circuit breaker includes an operating mechanism box 1 and a spring operating mechanism 2 that is movably mounted in the operating mechanism box 1, and an electric control mechanism 3 that is fixedly mounted below the operating mechanism box 1 and is transmission-connected to the spring operating mechanism 2. A mounting platform 4 is fixedly mounted on one side of the operating mechanism box 1 and the electric control mechanism 3, and a vacuum arc extinguishing tube 8 is provided above the mounting platform 4. A static contact 1301 is provided above the inner side of the vacuum arc extinguishing tube 8, and a moving contact 1402 is provided below the static contact 1301. Fixed rods 805 are fixedly mounted equidistantly around the inner side of the vacuum arc extinguishing tube 8. Fixed support plates 804 are fixedly mounted between and below the fixed rods 805, and an air duct is provided on one side of the fixed support plates 804. An extrusion plate 803 is provided above the fixed support plates 804, and the extrusion plates 803 are each mounted in an inward manner on the inner side of the fixed rods 805.

[0043] As an embodiment of the present invention, Figures 1 to 7As shown, the static contact 1301 is fixedly mounted below the static voltage rod 13, and the moving contact 1402 is fixedly mounted above the dynamic voltage rod 14. A shift rod 1403 is provided below the moving contact 1402, and the shift rod 1403 is fixedly mounted above the dynamic voltage rod 14 at an equal distance. A disc-shaped groove is provided in the middle of the surface of the static contact 1301 and the moving contact 1402, and arc grooves are provided on both the static contact 1301 and the moving contact 1402 at equal distances.

[0044] During operation, the static contact 1301 and the moving contact 1402 are installed and used respectively through the static voltage rod 13 and the dynamic voltage rod 14. A disc-shaped groove is provided in the middle of the surface of the static contact 1301 and the moving contact 1402. When the static contact 1301 and the moving contact 1402 are closed and fit together, the high-voltage current flows through the disc-shaped groove to form a U-shaped ring circuit, so that the current flows radially toward the edge, avoiding the concentrated flow of direct current and causing local overheating, so as to improve the service life of the contact. At the same time, through the arc groove on the moving contact 1402, the current flows along the direction of the arc groove. At this time, the current in the arc groove is like an energized solenoid coil generating a longitudinal magnetic field to form a spiral arc, which forms a flow circuit with the memory metal sheet 8021. Secondly, the fixed support plate 804 and the extrusion plate 803 are installed through the fixing rod 805, so that the extrusion plate 803 and the fixed support plate 804 fit tightly to ensure the airtightness and air permeability of the air duct.

[0045] As an embodiment of the present invention, Figures 1 to 4 As shown, a fixed partition 6 is fixedly installed on one side of the operating mechanism box 1, and a plurality of insulating baffles 5 are fixedly installed on one side of the fixed partition 6. A fixed bracket 7 is provided between the insulating baffles 5, and the fixed bracket 7 is fixedly installed on the fixed partition 6. An opening and closing lifting rod 11 is provided below the fixed partition 6, and the opening and closing lifting rod 11 is movably connected to the operating mechanism box 1 through the inner side of the fixed partition 6. An insulating bracket 9 is fixedly installed on one side above the mounting platform 4, and a fixed support rod 12 is movably installed on the inner side of the insulating bracket 9, and the opening and closing lifting rod 11 and the fixed support rod 12 are movably connected in an interlocking manner;

[0046] A dynamic voltage rod 14 is movably mounted on the inner side of the opening and closing lifting rod 11, and a connecting shaft 1401 is mounted below the dynamic voltage rod 14. The dynamic voltage rod 14 is movably connected to the opening and closing lifting rod 11 through the connecting shaft 1401. A static voltage rod 13 is fixedly mounted below the fixed bracket 7. A power connection plate 10 is fixedly mounted on both the static voltage rod 13 and the dynamic voltage rod 14.

[0047] During operation, since the spring operating mechanism 2 and the electric control operating mechanism 3 are respectively installed inside and below the operating mechanism box 1, when closing the circuit breaker, by manually operating the spring operating mechanism 2, through transmission components such as the connecting rod, main shaft, and insulating pull rod on the spring operating mechanism 2 (the function of the spring operating mechanism 2 here is to control the tripping, closing, and maintaining the closed state of the circuit breaker. It is a technology that generates a strong operating function in a short time by the energy pre-stored in the closing spring to achieve the opening and closing operations of the circuit breaker. The spring operating mechanism 2 is an existing and mature technical means and is common knowledge to those skilled in the art, so no further elaboration will be made here), the opening and closing lifting rod 11 is used to lift the moving voltage rod 14 to achieve the closing of the moving contact 1402 and the static contact 1301. Or, through the electric control operating mechanism 3, the small gear on the electric control operating mechanism 3 is driven to rotate the gear disk on the main shaft (the function of the electric control operating mechanism 3 here is to control the spring operating mechanism 2 to control the tripping, closing, and maintaining the closed state of the circuit breaker. It is a technology that generates a strong operating function in a short time by the energy pre-stored in the closing spring to achieve the opening and closing operations of the circuit breaker. The electric control operating mechanism 3 is an existing and mature technical means and is common knowledge to those skilled in the art, so no further elaboration will be made here), and the power is transmitted to transmission components such as the connecting rod through the main shaft to further achieve the closing of the moving contact 1402 and the static contact 1301. When the opening and closing lifting rod 11 lifts the moving voltage rod 14 to achieve closing, since the insulating bracket 9 is fixedly installed on the mounting platform 4, the fixed support rod 12 is fitted and installed inside the insulating bracket 9 and is movably connected to the opening and closing lifting rod 11 in a fitting manner, and the moving voltage rod 14 is movably connected to the opening and closing lifting rod 11 through the connecting shaft 1401. When the opening and closing lifting rod 11 moves upward, the fixed support rod 12 will serve as a fulcrum, so that the moving voltage rod 14 rises as the opening and closing lifting rod 11 rises, and then pushes the moving contact 1402 to move upward to fit with the static contact 1301 to form a closed circuit to complete the closing. Secondly, the fixed partition 6 is installed on one side of the operating mechanism box 1, and the insulating baffle 5 and the fixed bracket 7 are installed and used through the fixed partition 6. Then, the static voltage rod 13 is fixedly installed through the fixed bracket 7 to install and use the vacuum interrupter 8. By installing the power connection plate 10 on the static voltage rod 13 and the moving voltage rod 14, the circuit connection is realized.

[0048] As an embodiment of the present invention, as Figures 8 to 17As shown, corrugated square tubes 8031 are fitted and movably installed on the inner sides of the extrusion plates 803. A dial plate 8032 is arranged in contact with the lower sides of the corrugated square tubes 8031, and the dial plate 8032 is fitted and movably installed on the inner sides of the extrusion plates 803. Spring members 8033 are fixedly installed on both sides inside the dial plate 8032. A dial piece 8034 is fixedly installed on one side of the spring member 8033, and the dial piece 8034 is fitted and installed inside the dial plate 8032. Card slots 8036 are arranged on both sides of the dial piece 8034;

[0049] Vent holes are arranged on the inner sides of the dial plate 8032, and the vent holes are in through communication with the ventilation channels on the fixed support plates 804 through the limit sliding plates 802. A card bead groove 8035 is fixedly installed on the inner side of the dial plate 8032. Spring card beads are arranged inside the card bead groove 8035, and the spring card beads are in fitting and movable connection with the card slots 8036. Magnetorheological fluid is arranged inside the corrugated square tubes 8031, and the magnetorheological fluid is filled in series and in through connection with the chute plate 8011, the telescopic rod 8023 and the corrugated square tubes 8031 through the corrugated ducts 8022;

[0050] During operation, since the air vent holes provided on one side of the paddle 8034 are arranged in a tee and are connected to the card slot 8036 in a penetrating manner, and the spring detent in the detent groove 8035 is adsorbed by negative pressure and fits in the card slot 8036 to latch the paddle 8034. When external air enters the arc extinguishing chamber and destroys the vacuum degree, the air enters from the joint of the moving voltage rod 14 and the vacuum arc extinguishing tube 8. At this time, the negative pressure degree in the vacuum arc extinguishing tube 8 decreases, and the entering air passes through the air passage on the fixed support plate 804, through the extrusion plate 803 and the air vent holes, and enters the paddle 8032. At this time, the suction force of the negative pressure on the air vent holes in the paddle 8034 decreases, so that the tension spring in the detent groove 8035 pulls back the spring detent to cancel the latching of the card slot 8036. The paddle 8034 elastically extends through the spring member 8033, so that the paddle 8034 extends a certain distance in the paddle 8032. Then, when the moving voltage rod 14 closes and rises, its lower side contacts the shift lever 1403. Thus, when the moving voltage rod 14 closes and rises, the paddle 8032 is driven to slide upward in the extrusion plate 803 through the contact between the shift lever 1403 and the paddle 8034. When the paddle 8032 slides upward in the extrusion plate 803, the corrugated square tube 8031 in the extrusion plate 803 is extruded through the paddle 8032 and the limit sliding plate 802. Then, the magnetorheological fluid in the corrugated square tube 8031 is squeezed into the telescopic rod 8023 through the corrugated conduit 8022 filled with magnetorheological fluid, so that the telescopic rod 8023 extends to bend and deform the shape memory alloy sheet 8021. At this time, the distance between the bent and deformed shape memory alloy sheet 8021 and the static contact 1301 and the moving contact 1402 is smaller than the distance between the static contact 1301 and the moving contact 1402. When the vacuum degree is destroyed, the irregularly moving point-contact spiral agglomerated arc between the static contact 1301 and the moving contact 1402 contacts and conducts through the shape memory alloy sheet 8021 respectively. At this time, the arc flows into the sides of the static contact 1301 and the moving contact 1402 through the shape memory alloy sheet 8021, so as to prevent the arc from forming a point-contact agglomerated arc on the surfaces of the static contact 1301 and the moving contact 1402 to generate a melting pit, and further avoid the agglomerated arc column of the arc in the melting pit.

[0051] As an embodiment of the present invention, as Figures 7 to 11 shown, limit sliding plates 802 are provided above the extrusion plate 803, and the limit sliding plates 802 are all fitted and installed inside the fixed rod 805. A shape memory alloy sheet 8021 is fitted and movably installed below one side of the limit sliding plate 802, and the thickness of the shape memory alloy sheet 8021 is arranged in a decreasing order on the limit sliding plate 802. Four corners on one side of the shape memory alloy sheet 8021 are fixedly installed with electromagnetic slide rods 8024, and the electromagnetic slide rods 8024 are all fitted and movably installed inside the limit sliding plate 802. A telescopic rod 8023 is arranged in the middle of the electromagnetic slide rod 8024, and one side of the telescopic rod 8023 is fixedly installed inside the limit sliding plate 802, and the other side is in contact with one side of the electromagnetic slide rod 8024;

[0052] During operation, when the point-contact type concentrated arc contacts and conducts with the shape memory alloy sheet 8021, the current passes through the shape memory alloy sheet 8021 at this time, causing the electromagnetic slide rod 8024 to generate magnetism. Under the action of the electromagnetic field, the viscosity of the magnetorheological fluid changes, so that the extended telescopic rod 8023 can stably keep the shape memory alloy sheet 8021 bent. When the static contact 1301 and the moving contact 1402 are closed and in contact, the resistance between them is relatively small at this time, and the current passing through the static contact 1301 and the moving contact 1402 no longer forms an arc flowing through the shape memory alloy sheet 8021. Subsequently, after the shape memory alloy sheet 8021 loses the action of the current, the heat generated by the current arc at the resistance of the shape memory alloy sheet 8021 will gradually cool down, and the shape memory alloy sheet 8021 gradually returns to its initial state. At the same time, the electromagnetic slide rod 8024 no longer generates magnetism, and then the magnetorheological fluid in the telescopic rod 8023 is pressed back into the corrugated conduit 8022. The shifter 8034 is used to always keep in contact with the shift lever 1403 after closing, and then the magnetorheological fluid pressed back into the corrugated conduit 8022 flows through the corrugated conduit 8022 into the chute plate 8011.

[0053] As an embodiment of the present invention, as Figures 6 to 10 shown, inert gas tanks 801 are provided above the limit slide plates 802, and the inert gas tanks 801 are fixedly installed above the interior of the vacuum interrupter 8. One side of the inert gas tank 801 is fixedly installed with a chute plate 8011, and an opening and closing slide 8013 is movably installed in the chute plate 8011 in an embedded manner. A nozzle 8012 is installed through the middle of the chute plate 8(11), and one side of the opening and closing slide 8013 is attached to the inner side of the nozzle 8012. One side of the chute plate (8011) is connected through a corrugated conduit 8022, and the corrugated conduit 8022 is installed in the limit slide plate 802 in an embedded manner;

[0054] During operation, when the magnetorheological fluid flows through the corrugated conduit 8022 into the chute plate 8011, it pushes the opening and closing sliding plate 8013 inside the chute plate 8011 to slide, making the opening on the opening and closing sliding plate 8013 correspond to the nozzle 8012. Then, the inert gas in the inert gas tank 801 (this kind of inert gas is used for fire extinguishing and can include, but is not limited to, inert gases such as nitrogen, carbon dioxide, and argon) is ejected. At this time, the inert gas ejected from the inert gas tank 801 will fill the vacuum interrupter 8 to prevent the generation of electric arcs during the opening and closing experiments. Secondly, the inert gas in the inert gas tank 801 is a colored gas. After filling the vacuum interrupter 8, the colored inert gas is ejected from the fitting place between the moving voltage rod 14 and the vacuum interrupter 8, forming an obvious visual warning and judging the approximate area of airtightness difference for maintenance personnel to check and repair in time. At the same time, since the thickness of the shape memory alloy sheet 8021 decreases successively, there is a time difference when the shape memory alloy sheet 8021 completely returns to its initial state. Thus, the inert gas ejected from the inert gas tank 801 is a continuous process to avoid the excessive pressure in the vacuum interrupter 8 caused by the simultaneous ejection of the inert gas in the inert gas tank 801, which may lead to a sudden increase in the internal pressure of the arc extinguishing chamber vacuum interrupter 8 and affect the safe operation of the equipment.

[0055] Working principle: Driven by the rotation of the gear disk on the moving main shaft, the main shaft transmits power to transmission components such as the connecting rod, thereby realizing the closing action of the moving contact 1402 and the static contact 1301. When the opening and closing lifting rod 11 performs a lifting operation on the moving voltage rod 14 to complete closing, the fixed support rod 12 serves as a fulcrum, causing the moving voltage rod 14 to rise as the opening and closing lifting rod 11 is lifted, pushing the moving contact 1402 to move upward and fit with the static contact 1301 to form a closed circuit to complete closing. Then, the fixed partition 6 is installed on one side of the operating mechanism box 1, and the insulating baffle 5 and the fixed support 7 are installed and used through the fixed partition 6. Furthermore, the static voltage rod 13 is fixedly installed through the fixed support 7 to facilitate the installation and use of the vacuum interrupter 8. By installing the power connection plate 10 on the static voltage rod 13 and the moving voltage rod 14, the circuit connection is realized. The static voltage rod 13 and the moving voltage rod 14 are respectively used to install the static contact 1301 and the moving contact 1402, and disc-shaped grooves are provided in the middle of their surfaces. When closing, the static contact 1301 and the moving contact 1402 fit, and the high-voltage current flows through the disc-shaped groove to form a U-shaped ring circuit. The current moves radially towards the edge, avoiding the direct concentration of the current flow and causing local overheating, thereby improving the service life of the contacts. At the same time, the arc groove on the moving contact 1402 guides the current to flow along the arc groove direction, and the current generates a longitudinal magnetic field in the arc groove to form a spiral arc, forming a current-carrying circuit with the shape memory alloy sheet 8021. In addition, the fixed support plate 804 and the extrusion plate 803 are installed through the fixed rod 805;

[0056] When external air enters the arc extinguishing chamber and destroys the vacuum degree, the air enters from the joint of the moving voltage rod 14 and the vacuum arc extinguishing tube 8, resulting in a decrease in the negative pressure degree inside the vacuum arc extinguishing tube 8. The air passes through the air passage on the fixed support plate 804, enters the deflector plate 8032 through the extrusion plate 803 and the air through-hole. At this time, the suction force of the negative pressure on the air through-hole in the deflector 8034 decreases, so that the tension spring in the bead groove 8035 pulls the spring bead back, canceling the engagement with the card slot 8036. The deflector 8034 extends a certain distance in the deflector plate 8032 through the elastic extension of the spring member 8033. When the moving voltage rod 14 closes and rises, the lever 1403 contacts the deflector 8034, driving the deflector plate 8032 to slide upward in the extrusion plate 803. When the deflector plate 8032 slides upward in the extrusion plate 803, the corrugated square tube 8031 in the extrusion plate 803 is extruded by the deflector plate 8032 and the limit slide plate 802, and the magnetorheological fluid in the corrugated square tube 8031 is squeezed into the telescopic rod 8023, causing the telescopic rod 8023 to extend and bending the deformation memory metal sheet 8021. At this time, the distance between the bent memory metal sheet 8021 and the static contact 1301 and the moving contact 1402 is less than the distance between them. When the vacuum degree is destroyed, a point-contact spiral agglomeration type arc with irregular movement is generated between the static contact 1301 and the moving contact 1402, and contacts and conducts with the memory metal sheet 8021 respectively;

[0057] When the point-contact agglomeration type arc contacts and conducts with the memory metal sheet 8021, the current passes through the memory metal sheet 8021 to make the electromagnetic slide rod 8024 generate magnetism, so that the viscosity of the magnetorheological fluid changes under the action of the electromagnetic field, stably maintaining the extension of the telescopic rod 8023 and keeping the memory metal sheet 8021 bent. When the static contact 1301 and the moving contact 1402 are closed and in contact, the resistance between them is small, and the current passing through the static contact 1301 and the moving contact 1402 no longer forms an arc flowing through the memory metal sheet 8021. Subsequently, after the memory metal sheet 8021 loses the action of the current, the heat generated by the current arc at the resistance of the memory metal sheet 8021 gradually cools, and the memory metal sheet 8021 gradually returns to its initial state. At the same time, the electromagnetic slide rod 8024 no longer generates magnetism, and then the magnetorheological fluid in the telescopic rod 8023 is pressed back into the corrugated duct 8022. The deflector 8034 always remains in contact with the lever 1403 after closing, and then the magnetorheological fluid pressed back into the corrugated duct 8022 flows through the corrugated duct 8022 into the chute plate 8011;

[0058] When the magnetorheological fluid flows through the corrugated conduit 8022 into the chute plate 8011, the opening and closing sliding plate 8013 inside the chute plate 8011 is pushed to slide through the magnetorheological fluid, so that the opening on the opening and closing sliding plate 8013 corresponds to the nozzle 8012, and then the inert gas in the inert gas tank 801 is ejected. The inert gas ejected from the inert gas tank 801 will fill the vacuum interrupter 8 to prevent the generation of electric arcs during the opening and closing experiments. The inert gas in the inert gas tank 801 is a colored gas. After filling the vacuum interrupter 8, the colored inert gas is ejected from the contact area between the driven voltage rod 14 and the vacuum interrupter 8 to form an obvious visual warning and judge the approximate area of airtightness difference for maintenance personnel to check and repair in time. There is a time difference for the shape memory metal sheet 8021 to completely return to its initial state, so that the inert gas ejected from the inert gas tank 801 is a continuous process to avoid the excessive pressure in the vacuum interrupter 8 caused by the simultaneous ejection of the inert gas in the inert gas tank 801, resulting in a sudden increase in the internal pressure of the arc extinguishing chamber vacuum interrupter 8 and affecting the safe operation of the equipment.

[0059] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient test device for a high-voltage circuit breaker, comprising an operating mechanism box (1) and a spring operating mechanism (2) movably mounted in the operating mechanism box (1), and an electric control mechanism (3) fixedly mounted below the operating mechanism box (1) and transmission-connected to the spring operating mechanism (2), wherein a mounting platform (4) is fixedly mounted on one side of the operating mechanism box (1) and the electric control mechanism (3), and a vacuum arc extinguishing tube (8) is provided above the mounting platform (4), characterized in that: Above the inner side of the vacuum interrupter tube (8), a static contact (1301) is provided, and a moving contact (1402) is provided below the static contact (1301). Fixed rods (805) are fixedly installed around the inner side of the vacuum interrupter tube (8) at equal intervals. Below the fixed rods (805), fixed support plates (804) are fixedly installed in an embedded manner. One side of the fixed support plate (804) is provided with a ventilation channel in a penetrating manner. Above the fixed support plates (804), pressing plates (803) are provided, and the pressing plates (803) are all installed in the inner sides of the fixed rods (805) in an embedded manner; Inside the pressing plates (803), corrugated square tubes (8031) are installed in an embedded and movable manner. Below the corrugated square tubes (8031), a dial plate (8032) is provided in a fitting manner, and the dial plate (8032) is installed in the inner side of the pressing plate (803) in an embedded and movable manner. On both sides inside the dial plate (8032), spring members (8033) are fixedly installed. On one side of the spring members (8033), a dial piece (8034) is fixedly installed, and the dial piece (8034) is installed in the dial plate (8032) in an embedded manner. On both sides of the dial piece (8034), card slots (8036) are provided; Above the pressing plates (803), limit sliding plates (802) are provided, and the limit sliding plates (802) are all installed in the inner sides of the fixed rods (805) in an embedded manner. Below one side of the limit sliding plates (802), shape memory metal sheets (8021) are installed in an embedded and movable manner, and the thickness of the shape memory metal sheets (8021) decreases sequentially on the limit sliding plates (802). At the four corners on one side of the shape memory metal sheets (8021), electromagnetic sliding rods (8024) are fixedly installed, and the electromagnetic sliding rods (8024) are all installed in the inner sides of the limit sliding plates (802) in an embedded and movable manner. In the middle of the electromagnetic sliding rods (8024), telescopic rods (8023) are provided. One side of the telescopic rods (8023) is fixedly installed on the inner side of the limit sliding plates (802), and the other side is in contact with one side of the electromagnetic sliding rods (8024).

2. The high-efficiency test device for a high-voltage circuit breaker according to claim 1, wherein: Above the limit sliding plates (802), inert gas tanks (801) are provided, and the inert gas tanks (801) are fixedly installed above the inside of the vacuum interrupter tube (8). On one side of the inert gas tanks (801), a chute plate (8011) is fixedly installed, and a switching slide (8013) is installed in the chute plate (8011) in an embedded and movable manner.

3. The high-efficiency test device for a high-voltage circuit breaker according to claim 2, wherein: In the middle of the chute plate (8011), a nozzle (8012) is installed in a penetrating manner, and one side of the switching slide (8013) is in contact with the inner side of the nozzle (8012). On one side of the chute plate (8011), a corrugated conduit (8022) is connected in a penetrating manner, and the corrugated conduit (8022) is installed in the inner side of the limit sliding plate (802) in an embedded manner. The corrugated square tube (8031) is filled with magnetorheological fluid, and the magnetorheological fluid is connected in series and filled through the corrugated conduit (8022) with the chute plate (8011), the telescopic rod (8023), and the corrugated square tube (8031).

4. The high-efficiency test device for a high-voltage circuit breaker according to claim 1, wherein: The inner side of the dial plate (8032) is provided with ventilation holes, and the ventilation holes are communicated with the ventilation channels on the fixed support plate (804) through the limit slide plate (802). A bead groove (8035) is fixedly installed on the inner side of the dial plate (8032). A spring bead is arranged inside the bead groove (8035), and the spring bead is in interference fit and movable connection with the card slot (8036).

5. The high-efficiency test device for a high-voltage circuit breaker according to claim 1, wherein: A fixed partition plate (6) is fixedly installed on one side of the operating mechanism box (1), and a plurality of insulating baffles (5) are fixedly installed on one side of the fixed partition plate (6). A fixed bracket (7) is arranged between the insulating baffles (5), and the fixed bracket (7) is fixedly installed on the fixed partition plate (6).

6. The high-efficiency test device for a high-voltage circuit breaker according to claim 5, characterized in that: An opening and closing lifting rod (11) is arranged below the fixed partition plate (6), and the opening and closing lifting rod (11) is in interference fit and movable connection with the operating mechanism box (1) through the inner side of the fixed partition plate (6). An insulating bracket (9) is fixedly installed on the upper side of one side of the mounting frame table (4). A fixed support rod (12) is installed in the insulating bracket (9) in an interference fit manner, and the opening and closing lifting rod (11) is in interference fit and movable connection with the fixed support rod (12).

7. The high-efficiency test device for a high-voltage circuit breaker according to claim 6, characterized in that: A moving voltage rod (14) is installed in the inner side of the opening and closing lifting rod (11) in an interference fit and movable manner. A connecting shaft (1401) is installed in the lower part of the moving voltage rod (14) in an interference fit manner, and the moving voltage rod (14) is in interference fit and movable connection with the opening and closing lifting rod (11) through the connecting shaft (1401). A static voltage rod (13) is fixedly installed below the fixed bracket (7). Electric connection plates (10) are fixedly installed on both the static voltage rod (13) and the moving voltage rod (14).

8. The high-efficiency test device for a high-voltage circuit breaker according to claim 1, characterized in that: A static contact (1301) is fixedly installed below the static voltage rod (13). A moving contact (1402) is fixedly installed above the moving voltage rod (14). A dial rod (1403) is arranged below the moving contact (1402), and the dial rods (1403) are fixedly installed on the upper part of the moving voltage rod (14) at equal intervals.

9. The high-efficiency test device for a high-voltage circuit breaker according to claim 8, characterized in that: Disc-shaped grooves are arranged in the middle of the surfaces of both the static contact (1301) and the moving contact (1402), and arc grooves are arranged on both the static contact (1301) and the moving contact (1402) in an equidistant and surrounding manner.

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