Vacuum circuit breaker simulation device and vacuum circuit breaker operating mechanism test system

Abstract

The invention relates to the technical field of mechanical part testing, in particular to a vacuum circuit breaker simulation device and a vacuum circuit breaker operating mechanism testing system. The vacuum circuit breaker simulation device comprises a moving contact assembly and a static contact assembly, the moving contact assembly comprises a moving contact piece, a dowel bar assembly and an adapter piece, and the adapter piece is used for being in transmission connection with an operating mechanism matched with a vacuum circuit breaker. The number of the dowel bar assemblies is three, and each dowel bar assembly comprises two dowel bars and an overtravel spring for transmitting force between the two dowel bars. One of the two dowel bars of each dowel bar assembly is connected with the same moving contact piece, and the other dowel bar of each dowel bar assembly is connected with the adapter, so that the moving contact piece and the static contact assembly are matched to simulate opening and closing actions when the operating mechanism drives the moving contact assembly to move. The test can be realized by adopting one set of moving contact assembly and static contact assembly, the structure is simple, the number of parts is small, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical component testing, and in particular to a vacuum circuit breaker simulation device and a vacuum circuit breaker operating mechanism testing system. Background Art

[0002] As the power system develops towards green and low-carbon development, environmentally friendly switchgear has become an urgent need for the construction of new power systems. Vacuum circuit breakers are mechanical switch devices that use vacuum as an insulating and arc-extinguishing medium to achieve the closing, carrying and breaking functions of current under normal or abnormal circuit conditions. Vacuum circuit breakers have many advantages such as green environmental protection, long electrical life, and excellent post-arc dielectric recovery characteristics. High-voltage vacuum circuit breakers have become an inevitable trend in the development of power switch technology.

[0003] The opening and closing actions of the vacuum circuit breaker are completed by the corresponding operating mechanism. The connection structure between the arc extinguishing chamber of the vacuum circuit breaker and the insulating pull rod of the operating mechanism can be referred to Figure 1The arc extinguishing chamber of the vacuum circuit breaker includes a vacuum chamber 121, a moving contact rod 101, and a stationary contact rod 111. The moving contact rod 101 and the stationary contact rod 111 are provided with a moving contact 102 and a stationary contact 112 at opposite ends located in the vacuum chamber 121, respectively. The end of the moving contact rod 101 located outside the vacuum chamber 121 is connected to the insulating pull rod 201 of the operating mechanism through an overtravel spring 203, a connecting cylinder 202, and a movable connecting head 204. The movable connecting head 204 is hinged on the insulating pull rod 201. At the end, the movable contact rod 101 and the movable connecting head 204 have a force transmission part guided in the connecting tube 202, and retaining walls are provided at both ends of the connecting tube 202. The retaining walls at both ends are respectively provided with through holes for avoiding the movable contact rod 101 and the movable connecting head 204. The diameter of the force transmission part of the movable contact rod 101 and the movable connecting head 204 is larger than the inner diameter of the corresponding through hole, so as to limit the force transmission part of the movable contact rod 101 and the movable connecting head 204 respectively through the retaining walls at both ends of the connecting tube 202 to prevent them from falling out. The overtravel spring 203 is located in the connecting tube 202 and between the force transmission parts of the moving contact rod 101 and the movable connecting head 204. When closing the circuit breaker, the insulating pull rod 201 drives the movable connecting head 204 to apply pressure to the overtravel spring 203, and then the overtravel spring 203 applies a thrust to the moving contact rod 101 to perform the closing action. When the moving contact 102 and the static contact 112 just come into contact, they reach the just-closed point. At this time, the insulating pull rod 201 continues to apply force, the overtravel spring 203 is compressed, and the moving contact 102 does not move until the operating mechanism closes the circuit breaker and the moving contact 102 and the static contact 112 maintain sufficient contact force. When opening the circuit breaker, the insulating pull rod 201 drives the movable connector 204 in the reverse direction, and the overtravel spring 203 is elastically released. The movable connector 204 can apply a pulling force to the moving contact rod 101 through the connecting tube 202 to perform the opening action. When the moving contact 102 and the static contact 112 are just separated, they reach the just-opening point. At this time, the insulating pull rod 201 continues to apply force until the operating mechanism opens the circuit breaker.

[0004] Since the interior of the arc extinguishing chamber of the vacuum circuit breaker is a vacuum environment, under the action of the external atmospheric pressure, the moving contact rod of the arc extinguishing chamber will always be subjected to a self-closing force in the closing direction, and the insulating pull rod of the operating mechanism and the moving contact rod are transmitted through the overtravel spring, which will generate elastic force during the opening and closing process. The arc extinguishing chamber self-closing force and overtravel spring force unique to the vacuum circuit breaker will affect its breaking characteristics. The breaking characteristic parameters of the vacuum circuit breaker include the opening and closing speed, opening and closing stroke, etc. Since the moving contact and the static contact are the plate plane collision contact structure, if the opening and closing action characteristics do not meet the arc extinguishing chamber parameter requirements, it is very easy to cause leakage and damage to the vacuum arc extinguishing chamber, reduce the electrical performance of the product, and threaten the safe and stable operation of the power grid.

[0005] The mechanical characteristics of the operating mechanism are important factors to ensure the reliable operation of the vacuum circuit breaker. The matching of the characteristics of the operating mechanism and the vacuum circuit breaker is critical. In order to ensure that the operating mechanism matches the characteristic parameters of the vacuum circuit breaker well, the operating mechanism should complete the troubleshooting and the debugging of the characteristic parameters required for the vacuum circuit breaker before leaving the factory. Since the vacuum interrupter product is a very precise core component and is expensive, directly using the vacuum interrupter product to test the operating mechanism is likely to damage the vacuum interrupter and increase costs. Therefore, a test device that can simulate a vacuum circuit breaker is currently used to test the operating mechanism.

[0006] A vacuum circuit breaker simulator is disclosed in a Chinese utility model patent with authorization announcement number CN213689868U. The simulator is used to simulate a circuit breaker to perform a contact breaking test, and includes an upper cover plate, a lower cover plate, and a support structure connecting the upper cover plate and the lower cover plate. A static contact end is fixedly connected to one end of the upper cover plate away from the lower cover plate, and a static contact is threadedly connected to the static contact end at a predetermined distance from the upper cover plate in vertical height. A positioning hole is opened through the middle of the upper cover plate, and the lower cover plate is provided with a through hole. An insulating pull rod is arranged between the upper cover plate and the lower cover plate. The insulating pull rod includes an insulator, a moving contact end elastically connected to one end of the insulator, and a transmission end fixed to the other end of the insulator. The moving contact end is threadedly connected to a moving contact at one end away from the insulator, and the moving contact slides on the upper cover plate through the positioning hole to achieve cooperation with the static contact. The end of the transmission end away from the insulator passes through the through hole and is hinged to the output end of the drive device. The drive device is an operating mechanism matching the vacuum circuit breaker. The insulator is provided with a cylindrical cavity and an outlet connected to the cavity, the outlet cooperates with the moving contact end, the inner diameter of the cavity is larger than the inner diameter of the outlet, and a compression spring is provided between the inner bottom wall of the cavity and the moving contact end, and the compression spring can simulate the overtravel spring. The simulator can simulate the sealed pole of the vacuum circuit breaker.

[0007] The vacuum circuit breaker is usually a three-phase switch with three poles. Each pole is equipped with a vacuum arc extinguishing chamber. The same operating mechanism is connected to the moving end of the arc extinguishing chamber of the three poles through transmission. The operating mechanism drives the moving contacts in the three-phase poles to perform opening and closing actions synchronously. During the operation of the operating mechanism, the operating mechanism will be subject to the elastic force of the overtravel spring in the three-phase pole. In order to test the mechanical characteristics of the operating mechanism, three pole simulation devices simulating the three-phase poles of the vacuum circuit breaker are configured. Each pole simulation device is equipped with a moving contact assembly and a static contact assembly. The moving contact assembly includes an overtravel spring. The three pole simulation devices are connected to the same operating mechanism product to simulate the characteristics of the operating mechanism when actually driving the three-phase switch body to open and close. However, this form of testing the characteristics of the operating mechanism based on the three-phase vacuum circuit breaker with three sets of pole simulation devices requires the configuration of three sets of moving contact assemblies and static contact assemblies. The structure is relatively complex and the cost is high. In addition, the requirements for the installation position of the moving contact assembly and the static contact assembly are also relatively high. Summary of the invention

[0008] The object of the present invention is to provide a vacuum circuit breaker simulation device to solve the problem that the current device simulating a three-phase vacuum circuit breaker needs to be equipped with three sets of moving contact assemblies and static contact assemblies, resulting in high cost; the object of the present invention is also to provide a vacuum circuit breaker operating mechanism test system to solve the above problem.

[0009] The technical solution of the vacuum circuit breaker simulation device of the present invention is: A vacuum circuit breaker simulation device comprises a moving contact assembly and a stationary contact assembly, wherein the moving contact assembly comprises a moving contact piece, a force transmission rod assembly and an adapter, wherein the adapter is used for transmission connection with an operating mechanism of a matching vacuum circuit breaker, wherein there are three force transmission rod assemblies and each force transmission rod assembly comprises two force transmission rods and an overtravel spring for transmitting force between the two force transmission rods, wherein one of the two force transmission rods of each force transmission rod assembly is connected to the same moving contact piece and the other is connected to the adapter so that when the operating mechanism drives the moving contact assembly to move, the moving contact piece and the stationary contact assembly cooperate to simulate the opening and closing action.

[0010] Beneficial effects: The present invention provides an integrated vacuum circuit breaker simulation device in a pioneering manner, so that the same moving contact piece is connected to three force transmission rod assemblies, and the three force transmission rod assemblies are connected to the operating mechanism of the matching vacuum circuit breaker through an adapter. An overtravel spring is arranged between the two force transmission rods of the force transmission rod assembly respectively connected to the moving contact piece and the adapter to transmit force, so that the three force transmission rod assemblies are used to simulate the force of the overtravel springs in the three poles of the three-phase vacuum circuit breaker on the operating mechanism, and the structure of the simulation device is simplified while realizing the simulation of the stress characteristics of the vacuum circuit breaker. The test can be realized by using a set of moving contact assemblies and static contact assemblies. The structure is simple, the number of parts is small, and it is conducive to reducing costs.

[0011] Furthermore, the force transmission rod assembly includes a connecting sleeve, and retaining walls are provided at both ends of the connecting sleeve. The retaining walls at both ends are respectively provided with through holes for avoiding the two force transmission rods, and the retaining walls at both ends are used to stop the ends of the two force transmission rods located in the connecting sleeve from escaping from the connecting sleeve. The overtravel spring is arranged in the connecting sleeve and abuts between the two force transmission rods.

[0012] Furthermore, the connecting sleeve includes a spring support tube and an adjusting head threadedly connected to the tube mouth of the spring support tube. The bottom of the spring support tube and the adjusting head respectively constitute the two end retaining walls of the connecting sleeve. The overtravel spring abuts between the bottom of the spring support tube and the adjusting head to change the compression amount of the overtravel spring by screwing the adjusting head.

[0013] Furthermore, each force transmission rod assembly is evenly distributed around the circumference of the center line of the moving contact assembly, and a contact portion for contacting the stationary contact assembly is provided at a portion of the moving contact member located at the center line of the moving contact assembly.

[0014] Furthermore, the vacuum circuit breaker simulation device includes a base, the moving contact assembly is movably arranged on the base, the adapter includes a horizontal part and a vertical part, each force transmission rod assembly is connected to the horizontal part, and a guide hole is provided on the base for the vertical part to guide and penetrate.

[0015] Furthermore, the vacuum circuit breaker simulation device includes a self-closing force simulation mechanism, which includes a pressure chamber, the pressure chamber includes a liquid chamber for filling liquid and a gas chamber for filling compressed gas, a piston is provided in the pressure chamber to separate the liquid chamber and the gas chamber, the moving contact assembly has a pressure-bearing part in the liquid chamber, the pressure in the gas chamber is transmitted to the pressure-bearing part through the piston via the liquid chamber to form a simulated self-closing force on the moving contact assembly toward the static contact assembly, and the volume change of the pressure chamber caused by the movement of the pressure-bearing part when the moving contact assembly performs opening and closing movements satisfies the requirement that the simulated self-closing force is within an allowable deviation range.

[0016] Furthermore, the self-closing force simulation mechanism includes a pressure container and a pressure accumulator, the pressure accumulator is connected to the pressure container through a connecting pipe, the piston is arranged in the inner cavity of the pressure accumulator, the space of the inner cavity of the pressure accumulator on one side of the piston constitutes the gas chamber, the space of the pressure accumulator on the other side of the piston and the space in the connecting pipe and the space in the pressure container are used to form the liquid chamber.

[0017] Furthermore, the moving contact assembly includes a pressure-bearing rod, one end of which is fixed on the moving contact member, the pressure chamber includes a sliding sealing hole for the other end of the pressure-bearing rod to extend into, and the portion of the pressure-bearing rod extending into the pressure chamber constitutes the pressure-bearing portion.

[0018] The technical solution of the vacuum circuit breaker operating mechanism testing system of the present invention is: A vacuum circuit breaker operating mechanism test system includes a vacuum circuit breaker simulation device and a pressure compensation device. The vacuum circuit breaker simulation device includes a moving contact assembly and a static contact assembly. The moving contact assembly includes a moving contact piece, a force transmission rod assembly and an adapter. The adapter is used for transmission connection of the operating mechanism of the matching vacuum circuit breaker. There are three force transmission rod assemblies and each force transmission rod assembly includes two force transmission rods and an overtravel spring for transmitting force between the two force transmission rods. One of the two force transmission rods of each force transmission rod assembly is connected to the same moving contact piece, and the other is connected to the adapter so that when the operating mechanism drives the moving contact assembly to move, the moving contact piece and the static contact assembly cooperate to simulate the opening and closing action; the vacuum circuit breaker simulation device includes a self-closing force simulation mechanism The self-closing force simulation mechanism includes a pressure chamber, the pressure chamber includes a liquid chamber for filling liquid and a gas chamber for filling compressed gas, a piston is provided in the pressure chamber to separate the liquid chamber and the gas chamber, the moving contact assembly has a pressure-bearing part in the liquid chamber, the pressure in the gas chamber is transmitted to the pressure-bearing part through the piston via the liquid chamber to form a simulated self-closing force on the moving contact assembly toward the static contact assembly, and the volume change of the pressure chamber caused by the movement of the pressure-bearing part when the moving contact assembly performs opening and closing movements satisfies the requirement that the simulated self-closing force is within an allowable deviation range; the pressure-compensating device includes a liquid storage tank and a pressure-compensating pipeline connecting the liquid storage tank and the liquid chamber of the vacuum circuit breaker simulation device, and a pump for pumping liquid into the liquid chamber is provided on the pressure-compensating pipeline.

[0019] Beneficial effects: The present invention provides an integrated vacuum circuit breaker simulation device in a pioneering manner, so that the same moving contact piece is connected to three force transmission rod assemblies, and the three force transmission rod assemblies are connected to the operating mechanism of the matching vacuum circuit breaker through an adapter. An overtravel spring is arranged between the two force transmission rods of the force transmission rod assembly respectively connected to the moving contact piece and the adapter to transmit force, so that the three force transmission rod assemblies are used to simulate the force of the overtravel springs in the three poles of the three-phase vacuum circuit breaker on the operating mechanism, and the structure of the simulation device is simplified while realizing the simulation of the stress characteristics of the vacuum circuit breaker. The test can be realized by using a set of moving contact assemblies and static contact assemblies. The structure is simple, the number of parts is small, and it is beneficial to reduce costs; moreover, the self-closing force is formed by simulating the gas pressure, so that the change of the simulated self-closing force can be very small, which is not easy to cause a great impact on the test results, and is beneficial to reducing the deviation of the test results; the pressure is applied to the pressure-bearing part of the moving contact assembly by liquid, and the liquid has an incompressible characteristic. When the pressure-bearing part moves with the moving contact assembly, it is beneficial to maintain pressure stability and safety.

[0020] Furthermore, the force transmission rod assembly includes a connecting sleeve, and retaining walls are provided at both ends of the connecting sleeve. The retaining walls at both ends are respectively provided with through holes for avoiding the two force transmission rods, and the retaining walls at both ends are used to stop the ends of the two force transmission rods located in the connecting sleeve from escaping from the connecting sleeve. The overtravel spring is arranged in the connecting sleeve and abuts between the two force transmission rods.

[0021] Furthermore, the connecting sleeve includes a spring support tube and an adjusting head threadedly connected to the tube mouth of the spring support tube. The bottom of the spring support tube and the adjusting head respectively constitute the two end retaining walls of the connecting sleeve. The overtravel spring abuts between the bottom of the spring support tube and the adjusting head to change the compression amount of the overtravel spring by screwing the adjusting head.

[0022] Furthermore, each force transmission rod assembly is evenly distributed around the circumference of the center line of the moving contact assembly, and a contact portion for contacting the stationary contact assembly is provided at a portion of the moving contact member located at the center line of the moving contact assembly.

[0023] Furthermore, the vacuum circuit breaker simulation device includes a base, the moving contact assembly is movably arranged on the base, the adapter includes a horizontal part and a vertical part, each force transmission rod assembly is connected to the horizontal part, and a guide hole is provided on the base for the vertical part to guide and penetrate.

[0024] Furthermore, the self-closing force simulation mechanism includes a pressure container and a pressure accumulator, the pressure accumulator is connected to the pressure container through a connecting pipe, the piston is arranged in the inner cavity of the pressure accumulator, the space of the inner cavity of the pressure accumulator on one side of the piston constitutes the gas chamber, the space of the pressure accumulator on the other side of the piston and the space in the connecting pipe and the space in the pressure container are used to form the liquid chamber.

[0025] Furthermore, the moving contact assembly includes a pressure-bearing rod, one end of which is fixed on the moving contact member, the pressure chamber includes a sliding sealing hole for the other end of the pressure-bearing rod to extend into, and the portion of the pressure-bearing rod extending into the pressure chamber constitutes the pressure-bearing portion.

[0026] Furthermore, the same pressure compensation device is connected to two or more of the vacuum circuit breaker simulation devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the connection structure between the arc extinguishing chamber of the vacuum circuit breaker and the insulating pull rod of the operating mechanism; Figure 2 It is a structural schematic diagram of Embodiment 1 of the vacuum circuit breaker operating mechanism testing system of the present invention; Figure 3 for Figure 2 A schematic diagram of the distribution position of the force transmission rod assembly relative to the moving contact member; Figure 4 Schematic diagram of the connection relationship of various parts of Example 2 of the vacuum circuit breaker operating mechanism testing system of the present invention.

[0028] In the figure: 101, moving contact rod; 111, moving contact; 102, stationary contact rod; 112, stationary contact; 121, vacuum chamber; 201, insulating pull rod; 202, connecting tube; 203, overtravel spring; 204, movable connecting head; 1. Output shaft; 2. Output swing arm; 3. Transmission connecting rod; 4. Fixed shaft; 5. Transmission crank arm; 6. Transmission pull rod; 7. Adapter; 8. Guide ring; 9. Upper counterweight; 10. Guide support; 11. Upper force transmission rod; 12. Connecting pipe; 13. Guide sleeve; 14. Adjustment head; 15. Spring support cylinder; 16. Lower force transmission rod; 17. Insulation gasket; 18. Support base; 19. Fastening bolts; 20. Static contact piece; 21 , lower counterweight; 22, moving contact; 23, pressure rod; 24, overtravel spring; 25, pressure container; 26, fixed support; 27, operating mechanism; 28, fracture detection system; 29, piston; 30, pressure accumulator; 31, oil pressure switch; 32, oil pressure gauge; 33, pressure relief valve; 34, oil return pipe; 35, oil tank; 36, motor; 37, coupling; 38, oil pump; 39, high-pressure oil pipe; 40, pressure-compensating oil pipe. DETAILED DESCRIPTION

[0029] The vacuum circuit breaker simulation device of the present invention utilizes three force transmission rod assemblies to simulate the force of the overtravel springs in the three poles of the three-phase vacuum circuit breaker on the operating mechanism, and can realize the test by using a set of moving contact assemblies and static contact assemblies. It has a simple structure, a small number of parts, and is conducive to reducing costs.

[0030] The technical solution of the present invention is specifically described below in conjunction with embodiments.

[0031] Embodiment 1 of the vacuum circuit breaker operating mechanism test system of the present invention: like Figure 2 As shown, the vacuum circuit breaker operating mechanism test system includes a vacuum circuit breaker simulation device, which includes a base, a moving contact assembly, a static contact assembly, a moving end transmission mechanism, a self-closing force simulation mechanism and a fracture detection system 28. The base includes a guide support 10, a fixed support 26 and a support base 18, the moving contact assembly includes an adapter 7, a force transmission rod assembly and a moving contact member 22, and a pressure bearing rod 23, and the moving contact assembly guide is movably arranged on the base. The static contact assembly includes a static contact member 20. The moving end transmission mechanism includes an output swing arm 2, a transmission connecting rod 3, a fixed shaft 4, a transmission crank arm 5 and a transmission pull rod 6. The vacuum circuit breaker operating mechanism is the operating mechanism 27, and the operating mechanism 27 is connected to the moving contact assembly through the moving end transmission mechanism. The adapter 7 is used to drive and connect the operating mechanism 27 of the matching vacuum circuit breaker, so that the moving contact assembly is connected to the vacuum circuit breaker operating mechanism, so that when the operating mechanism 27 is tested, the operating mechanism 27 drives the moving contact assembly to move, and then cooperates with the static contact assembly to perform the opening and closing action. The vacuum circuit breaker simulation device is used to perform characteristic testing on the operating mechanism 27 before it leaves the factory, so as to achieve characteristic matching with the vacuum circuit breaker product.

[0032] In order to adapt to the overtravel spring force of the simulated three-phase vacuum circuit breaker, there are three force transmission rod assemblies and each force transmission rod assembly includes two force transmission rods and an overtravel spring 24 that transmits force between the two force transmission rods. The two force transmission rods are respectively an upper force transmission rod 11 and a lower force transmission rod 16. One of the two force transmission rods of each force transmission rod assembly is connected to the same moving contact piece 22, and the other is connected to the same adapter 7 so that when the operating mechanism 27 drives the moving contact assembly to move, the moving contact piece 22 cooperates with the static contact assembly to simulate the opening and closing action. The three force transmission rod assemblies equipped with overtravel springs 24 are used to simulate the force of the overtravel springs 24 in the three poles of the three-phase vacuum circuit breaker on the operating mechanism 27, and the structure of the simulation device is simplified while realizing the simulation of the force characteristics of the vacuum circuit breaker. The test can be realized by using a set of moving contact assemblies and static contact assemblies. The structure is simple, the number of parts is small, and it is conducive to reducing costs. Moreover, it is convenient to control the relative position of the moving contact assembly and the static contact assembly, which is conducive to accurate testing.

[0033] The force transmission rod assembly includes a connecting sleeve, and retaining walls are respectively provided at both ends of the connecting sleeve. The retaining walls at both ends are respectively provided with perforations for avoiding the two force transmission rods, and the retaining walls at both ends are used to stop and cooperate with one end of the two force transmission rods located in the connecting sleeve in the direction of escaping from the connecting sleeve, so as to limit the corresponding ends of the two force transmission rods in the connecting sleeve. The overtravel spring 24 is arranged in the connecting sleeve and abuts between the upper force transmission rod 11 and the lower force transmission rod 16. The connecting sleeve that is separately arranged with the two force transmission rods is used to limit the relative positions of the overtravel spring 24 and the force transmission rod, which is convenient for parts processing and manufacturing. The force transmission rod is a metal part, which can reduce the volume while maintaining strength. In other embodiments, one of the two force transmission rods can also be provided with an integrally connected cylinder body, and the other can be provided with a force transmission end extending into the cylinder body. The overtravel spring is arranged between the bottom of the corresponding cylinder body and the force transmission end, and a retaining ring is fixed at the cylinder mouth of the cylinder body, and the retaining ring is used to prevent the force transmission end from escaping.

[0034] The connecting sleeve of the force transmission rod assembly includes a spring support tube 15 and an adjusting head 14 threadedly connected to the tube mouth of the spring support tube 15. The bottom of the spring support tube 15 and the adjusting head 14 respectively constitute the two end retaining walls of the connecting sleeve. The overtravel spring 24 abuts between the bottom of the spring support tube 15 and the adjusting head 14 to change the compression amount of the overtravel spring 24 by screwing the adjusting head 14. One end of the force transmission rod located in the spring support tube 15 is the force transmission end. The force transmission end is provided with a guide portion adapted to the inner diameter of the spring support tube 15 and a retaining portion for the overtravel spring 24 to be sleeved. The outer diameters of the guide portion and the retaining portion are larger than the outer diameter of the main rod body of the force transmission rod. The main rod body extends out of the connecting sleeve, and the retaining portion is located on the side of the guide portion away from the main rod body. The force transmission ends of the upper force transmission rod 11 and the lower force transmission rod 16 are arranged at intervals up and down, the bottom of the spring support tube 15 is provided with a through hole for the main rod body of the lower force transmission rod 16 to fit through, the adjusting head 14 is provided with a through hole for the main rod body of the upper force transmission rod 11 to fit through, the adjusting head 14 is provided with an external thread to be threadedly connected in the spring support tube 15, the adjusting head 14 can limit the guide part of the upper force transmission rod 11 from slipping out upward, and the bottom of the spring support tube 15 can limit the guide part of the lower force transmission rod 16 from slipping out downward. By screwing the adjusting head 14, the relative position of the upper force transmission rod 11 and the lower force transmission rod 16 can be changed, thereby changing the pre-compression amount of the overtravel spring 24, which is convenient for adjustment. In other embodiments, a retaining ring can also be provided at the tube mouth of the spring support tube as a retaining wall to limit the position of the upper force transmission rod.

[0035] The moving contact assembly can move up and down. The moving contact assembly has a center line extending up and down. The upper force rod 11 and the lower force rod 16 both extend up and down. The upper end of the upper force rod 11 is connected to the adapter 7, and the lower end of the lower force rod 16 is connected to the moving contact member 22. The upper force rod 11 and the lower force rod 16 of the same force rod assembly are coaxially arranged. Each force rod assembly is evenly distributed around the circumference of the center line of the moving contact assembly. Figure 3 The moving contact 22 is a circular plate structure, the lower force transmission rods 16 of the three force transmission rod assemblies are connected to the edge of the moving contact 22, and the moving contact 22 is provided with a contact portion for contacting the static contact assembly at the position located on the center line of the moving contact assembly, and the contact portion is located at the center of the lower side of the moving contact 22, which has a compact structure and is conducive to reliable force. In other embodiments, the three force transmission rod assemblies can also be arranged side by side, and accordingly, the moving contact is a rod-shaped structure.

[0036] The self-closing force simulation mechanism of the vacuum circuit breaker simulation device is used to simulate the self-closing force of the vacuum circuit breaker, so as to more accurately test the mechanical characteristics of the operating mechanism 27. The self-closing force simulation mechanism includes a pressure chamber, which includes a liquid chamber for filling liquid and a gas chamber for filling compressed gas. A piston 29 is provided in the pressure chamber to separate the liquid chamber and the gas chamber. The moving contact assembly has a pressure-bearing part in the liquid chamber, and the pressure-bearing part is provided on the pressure-bearing rod 23. The pressure in the gas chamber is transmitted to the pressure-bearing part through the piston 29 through the liquid chamber to form a simulated self-closing force on the moving contact assembly toward the static contact assembly. When the moving contact assembly performs the opening and closing movement, the change in the volume of the pressure chamber caused by the movement of the pressure-bearing part satisfies the requirement that the simulated self-closing force is within the allowable deviation range.

[0037] The gas chamber of the pressure chamber is filled with compressed gas and has pressure. The pressure in the gas chamber acts on the piston 29, and the piston 29 transfers the pressure to the liquid in the liquid chamber, and then transfers the pressure to the pressure-bearing part of the moving contact assembly extending into the liquid chamber through the liquid, forming a force on the moving contact assembly toward the static contact assembly. When the moving contact assembly is driven by the operating mechanism 27 to approach the static contact assembly to perform a closing action or move away from the static contact assembly to perform an opening action, the pressure chamber will always apply a force to the moving contact assembly toward the side where the static contact assembly is located, that is, a force in the closing direction. At the same time, when the moving contact assembly performs an opening and closing movement, the pressure-bearing part will also move accordingly, thereby causing a volume change in the liquid chamber. When the volume of the liquid chamber changes, the piston 29 will move under the action of the pressure in the gas chamber. Through the piston 29 The movement of the gas chamber causes the volume of the gas chamber to change, and since the change in the pressure chamber volume satisfies the requirement that the simulated self-closing force is within the allowable deviation range, that is, the change in the pressure chamber volume caused by the movement of the pressure-bearing part is much smaller than the gas chamber volume, the change in the gas chamber volume is very small, and the impact on the pressure in the gas chamber is very small. The pressure fluctuation is within the allowable deviation range, and the pressure can be considered to be an approximate constant. The force exerted on the moving contact assembly by the pressure can be used as a simulated self-closing force to equal the actual self-closing force, and a self-closing force simulation mechanism with a pressure chamber is used to simulate the self-closing force of an actual vacuum circuit breaker product. This vacuum circuit breaker simulation device that uses gas pressure to simulate the self-closing force can make the change in the simulated self-closing force very small, which is not easy to have a great impact on the test results, and is beneficial to reducing the deviation of the test results.

[0038] The pressure chamber includes a liquid chamber and a gas chamber. The pressure in the gas chamber is transmitted to the liquid in the liquid chamber through the piston 29, and then the pressure is applied to the pressure-bearing part of the moving contact assembly through the liquid. The liquid has an incompressible characteristic, which is conducive to maintaining pressure stability and safety when the pressure-bearing part moves with the moving contact assembly. In other embodiments, a compression spring can also be provided between the moving contact assembly and the base, and the compression spring is used to apply a force in the closing direction to the moving contact assembly to simulate a self-closing force.

[0039] The self-closing force simulation mechanism includes a pressure container 25 and a pressure accumulator 30. The pressure accumulator 30 is connected to the pressure container 25 through a connecting pipe 12. The piston 29 is arranged in the inner cavity of the pressure accumulator 30. The space of the inner cavity of the pressure accumulator 30 located on one side of the piston 29 constitutes a gas cavity. The space of the pressure accumulator 30 located on the other side of the piston 29 and the space in the connecting pipe 12 and the space in the pressure container 25 are used to form a liquid cavity. The pressure-bearing part of the moving contact assembly extends into the pressure container 25. The pressure accumulator 30 is used to facilitate the setting of a gas cavity with a larger volume. The pressure container 25 is used to fill the liquid without setting a large volume, which is convenient for the connection between the self-closing force mechanism and the moving contact assembly. In other embodiments, if the installation space allows, the pressure cavity of the self-closing force simulation mechanism can also be formed by the inner cavity of a single pressure container. The volume of the pressure container is set large enough to meet the requirements. Accordingly, the piston is arranged in the pressure container to separate the inner cavity of the pressure container into a liquid cavity and a gas cavity.

[0040] The upper end of each dowel rod assembly is connected to the same adapter 7, and the lower end is connected to the same moving contact piece 22. The adapter 7 is connected to the operating mechanism 27 through the moving end transmission mechanism. The moving contact piece 22 is used to cooperate with the static contact piece 20 of the static contact assembly to open and close the switch. The pressure-bearing rod 23 is arranged on the moving contact piece 22 and is located at the center of the area surrounded by each dowel rod assembly, that is, the lower end of the pressure-bearing rod 23 is fixed at the center of the moving contact piece 22. The moving contact piece 22 is evenly stressed, and the area between each dowel rod assembly can be used to set the self-closing force simulation mechanism for easy layout.

[0041] The base is a frame with a certain height. The guide support 10, the fixed support 26 and the support base 18 are parts of the base with different heights. The guide support 10 is located above the fixed support 26, and the fixed support 26 is located above the support base 18. The moving contact assembly is guided and movably mounted on the guide support 10 and the fixed support 26, and the static contact assembly is mounted on the support base 18. The base also includes a support for mounting an operating mechanism 27 and a support for mounting a fracture detection system 28. The pressure container 25 of the self-closing force simulation mechanism is fixed on the fixed support 26, and the pressure accumulator 30 is fixedly supported on supports at other corresponding positions of the base.

[0042] A guide ring 8 is provided at the center of the guide support 10 of the base. The guide ring 8 has an inner hole that passes through from top to bottom. The adapter 7 includes a vertical part and a horizontal part. The horizontal part is a disc structure to facilitate the connection of each force transmission rod assembly. The vertical part is a rod-shaped structure. The vertical part guide is passed through the guide ring 8. The lower end of the vertical part is connected to the central part of the horizontal part, and the upper end is hinged to the transmission pull rod 6. The transmission pull rod 6 is hinged to one end of the transmission crank arm 5. The transmission crank arm 5 is rotatably installed on the fixed shaft 4. The fixed shaft 4 is fixed on the base. The other end of the transmission crank arm 5 is hinged to one end of the transmission connecting rod 3. The other end of the transmission connecting rod 3 is connected to the output swing arm 2. The output swing arm 2 is fixed on the output shaft 1 of the operating mechanism 27.

[0043] The horizontal portion of the adapter 7 is located at the lower side of the guide support 10 and is fixedly connected to the upper end of the force transmitting rod 11 of each force transmitting rod assembly. The fixed support 26 is provided with a guide sleeve 13 for the force transmitting rod 11 of each force transmitting rod assembly to pass through. The inner hole of the guide sleeve 13 constitutes a guide hole for the force transmitting rod assembly to pass through. The force transmitting rod assembly is guided by the fixed support 26 to make the moving contact assembly move straight up and down, which is conducive to maintaining the moving trajectory. In other embodiments, the fixed support may not guide the force transmitting rod assembly, and only the guiding movement of the adapter on the guide support is used to achieve the linear movement of the moving contact assembly. In other embodiments, the adapter may not be provided with a vertical portion for cooperating with the base guide. The adapter is a disc, and the transmission pull rod is directly hinged at the center of the disc. The moving trajectory of the moving contact assembly is maintained only by the guiding movement of the force transmitting rod assembly on the fixed support.

[0044] The lower end of the pressure rod 23 is fixed on the moving contact member 22 and fixed on the upper side of the moving contact member 22. The contact portion of the lower side of the central part of the moving contact member 22 is used to contact the static contact member 20. The pressure container 25 is arranged above the moving contact member 22 and is located between the three force transmission rod assemblies and on the lower side of the fixed support 26. The upper part of the pressure container 25 is fixed on the fixed support 26. The lower part of the pressure container 25 is provided with a sliding sealing hole for the upper end of the pressure rod 23 to extend into. A sealing ring is arranged between the pressure rod 23 and the hole wall of the sliding sealing hole. While keeping the liquid cavity sealed, the pressure rod 23 can be moved up and down. The pressure in the liquid cavity acts on the upper end of the pressure rod 23. The pressure-bearing part is formed by the pressure rod 23 arranged on the moving contact member 22. The pressure rod 23 with a smaller diameter can be used to extend into the pressure cavity, reducing the influence of the movement of the pressure rod 23 on the volume change of the pressure cavity. In other implementations, a pressure-bearing cylinder may be provided on the moving contact member, a guide column is provided at the bottom of the pressure container, a through hole is provided in the guide column, the pressure-bearing cylinder is sealingly sleeved on the guide column, and the bottom of the pressure-bearing cylinder constitutes a pressure-bearing portion.

[0045] The pressure container 25 is a tank body, which includes a tank bottom, a tank wall and a tank cover. The tank bottom is provided with an extended section cantilevered downward, and the outer diameter of the extended section is smaller than the outer diameter of the tank wall. A sliding sealing hole for the pressure-bearing rod 23 to extend into is arranged in the extended section. After the switch is closed in place, the upper end of the pressure-bearing rod 23 does not protrude from the sliding sealing hole, and the pressure-bearing rod 23 does not extend into the main cavity surrounded by the tank wall of the tank body. The pressure accumulator 30 is a vertically arranged column, and the piston 29 is slidably sealed in the inner cavity of the pressure accumulator 30. The space located below the piston 29 in the inner cavity of the pressure accumulator 30 constitutes a gas cavity, and the space located above the piston 29 is used to form a part of the liquid cavity. The pressure accumulator 30 is provided with a charging interface at the bottom and a top cover at the top. The two ends of the connecting pipe 12 are respectively connected to the top cover of the pressure accumulator 30 and the tank cover of the pressure container 25. The fixed support 26 is provided with a circumvention hole for circumventing the connecting pipe 12. The top cover of the pressure accumulator 30 and the tank cover of the pressure container 25 are respectively provided with channels corresponding to the connecting pipe 12, so that the space located above the piston 29 of the pressure accumulator 30 is connected with the inner space of the pressure container 25 through the connecting pipe 12, thereby forming a liquid cavity. The top cover of the pressure accumulator 30 and the tank cover of the pressure container 25 are provided with a liquid filling interface for filling liquid and an exhaust valve for exhausting excess air. The liquid cavity and the gas cavity are isolated from each other and are both sealed cavities.

[0046] The static contact member 20 is located below the moving contact member 22. The radial dimension of the static contact member 20 is relatively small. The static contact member 20 is a column, and its upper end surface is used to contact the lower side surface of the moving contact member 22. The lower end of the static contact member 20 is fixed to the support base 18 by a fastening bolt 19. The vacuum circuit breaker simulation device also includes an opening adjustment structure for adjusting the distance between the static contact member 20 and the moving contact member 22. The opening adjustment structure is an insulating gasket 17 padded between the static contact member 20 and the support base 18. The installation height of the static contact member 20 is adjusted by the number or thickness of the insulating gasket 17, which can adapt to the simulation of vacuum circuit breakers with different opening distances.

[0047] The lower end of the lower force transmission rod 16 of each force transmission rod assembly of the moving contact assembly passes through the moving contact member 22, the lower end of the lower force transmission rod 16 is provided with a lower counterweight 21, the upper end of the upper force transmission rod 11 passes through the horizontal part of the adapter 7, the upper end of the upper force transmission rod 11 is provided with an upper counterweight 9, and the guide support 10 is provided with an avoidance hole for the upper counterweight 9 to pass through. The counterweight has a set weight to simulate the load formed by the gravity of the vacuum circuit breaker, so that the weight of the entire moving contact assembly meets the load requirements.

[0048] The fracture detection system 28 is connected to the operating mechanism 27 and the static contact assembly through a wire. The various components of the static contact assembly, the various components of the moving contact assembly, and the various components of the moving end transmission mechanism are all metal parts and can conduct electricity. When the fracture detection system 28 is powered on and the moving contact member 22 and the static contact member 20 are closed, the fracture detection system 28, the operating mechanism 27, the moving end transmission mechanism, the moving contact assembly, and the static contact assembly form a loop, so that the opening and closing signals can be detected. The vacuum circuit breaker simulation device is equipped with a sensor for detecting the moving contact assembly moving speed. The sensor is connected to the fracture detection system 28 for communication, and can test the speed at which the operating mechanism 27 drives the moving contact assembly to move.

[0049] The closing process of the vacuum circuit breaker simulation device: the output shaft 1 of the operating mechanism 27 rotates clockwise, and the transmission connecting rod 3 is pulled by the output swing arm 2 to drive the transmission crank arm 5 to rotate clockwise around the fixed axis 4, pushing the transmission pull rod 6, and the transmission pull rod 6 drives the adapter 7, the force transmission rod assembly, and the moving contact piece 22 to move in the closing direction (downward). When the moving contact piece 22 moves to contact the static contact piece 20, the break is connected, and the characteristic test simulates the circuit breaker just closing point position. The operating mechanism 27 drives the moving contact piece 22 to continue to move in the closing direction, compressing the overtravel spring 24 (simulating the circuit breaker overtravel spring 24 force) until the operating mechanism 27 drives the moving contact piece 22 to close and stop. Ensure that the moving contact piece 22 and the static contact piece 20 of the simulation device will not bounce and maintain a certain pressure, so as to achieve reliable closing of the simulation device. The break detection system 28 monitors the closing characteristic curve of the simulation device. During this process, the compressed gas in the accumulator 30 pushes the liquid in the accumulator 30, which is connected with the liquid in the pressure container 25 through the connecting pipe 12. The pressurized liquid pushes the pressure rod 23 to provide an approximately constant force in the closing direction. By controlling the volume ratio of the pressure rod 23 and the compressed gas in the accumulator 30, it can be considered that the force provided by the pressure rod 23 in the closing direction is a constant force. The volume change of the compressed gas in the accumulator 30 in this embodiment is less than 5%.

[0050] The opening process of the vacuum circuit breaker simulation device: the output shaft 1 of the operating mechanism 27 rotates counterclockwise, and drives the moving contact 22 to move in the opening direction (upward) through the output swing arm 2, the transmission connecting rod 3, the transmission crank arm 5, the transmission pull rod 6, the adapter 7, and the force transmission rod assembly. During this process, the overtravel spring 24 releases the spring energy, and the auxiliary operating mechanism 27 drives the simulation device to open. When the moving contact 22 moves to the separated static contact 20, the break is disconnected, and the characteristic test simulates the circuit breaker just opening point position. The spring force value of the overtravel spring 24 disappears, and the operating mechanism 27 drives the moving contact 22 to continue to move in the opening direction until the operating mechanism 27 drives the moving contact 22 to open and stop. The simulation device is reliably opened, and the break detection system 28 monitors the opening characteristic curve of the simulation device. During this process, the pressure accumulator 30 provides an approximately constant force (simulating the self-closing force of the circuit breaker) to the pressure rod 23 in the closing direction.

[0051] By adjusting the mass of the counterweight, the mass of the vacuum circuit breaker can be simulated equivalently, by adjusting the compressed gas pressure of the pressure accumulator 30, the self-closing force of the vacuum circuit breaker can be simulated equivalently, by screwing the adjustment head 14 or replacing the overtravel spring 24, the force of the overtravel spring 24 of the vacuum circuit breaker can be simulated equivalently, and by adjusting the height of the static contact 20 relative to the support base 18, the opening distance of the vacuum circuit breaker can be simulated equivalently. Through the above adjustments, the vacuum circuit breaker simulation device can be matched with the product characteristics of vacuum circuit breakers of different voltage levels to meet the test needs of the operating mechanism 27 adapted to different vacuum circuit breakers.

[0052] The vacuum circuit breaker operating mechanism test system also includes a pressure-compensating device, which includes a liquid storage tank and a pressure-compensating pipeline connecting the liquid storage tank and the liquid cavity of the vacuum circuit breaker simulation device, and a pump for pumping liquid into the liquid cavity is provided on the pressure-compensating pipeline to ensure that there is a set pressure in the pressure accumulator. In other embodiments, the pressure-compensating device may not be provided, but the pressure may be compensated by supplementing compressed gas through the gas charging interface of the gas cavity.

[0053] The pressure compensation device includes an oil pressure switch 31 , an oil pressure gauge 32 , a pressure relief valve 33 , an oil return pipe 34 , an oil tank 35 , a motor 36 , a coupling 37 , an oil pump 38 , a high-pressure oil pipe 39 , and a pressure compensation oil pipe 40 . The motor 36 is connected to the oil pump 38 through a coupling 37 to drive the oil pump 38 to work. The oil pump 38 is a pump for pumping liquid into the liquid cavity of the self-closing force simulation mechanism. The liquid in the liquid cavity is hydraulic oil. The oil pump 38 is connected to the oil tank 35. The oil tank 35 constitutes a liquid storage tank. The liquid replenishment pipeline includes a high-pressure oil pipe 39 and a pressure-compensating oil pipe 40. The high-pressure oil pipe 39 connects the oil pump 38 with the control valve. The control valve is connected to the connecting pipe 12 of the vacuum circuit breaker simulation device through the pressure-compensating oil pipe 40. The oil pressure gauge 32 is arranged on the pressure-compensating oil pipe 40 for detecting the oil pressure. An overflow valve is provided on the pipeline between the oil pump 38 and the control valve. The pipeline between the control valve and the liquid cavity of the self-closing force simulation mechanism is connected with an overflow valve, a pressure relief valve 33 and an oil pressure switch 31 from upstream to downstream. Each overflow valve and pressure relief valve 33 is connected to the oil tank 35 through a corresponding return oil pipe 34.

[0054] After the vacuum circuit breaker operating mechanism test system is assembled, first, according to the pressure requirement of the corresponding specification vacuum circuit breaker, the accumulator 30 is filled with compressed gas of a certain pressure, and then the energy storage motor 36 is energized, the drive coupling 37 drives the oil pump 38 to rotate, and the accumulator 30 is pressurized through the high-pressure oil pipe 39 and the pressure-compensating oil pipe 40 until the oil pressure gauge 32 displays the rated oil pressure value. Through the on and off of the oil pressure switch 31, the motor 36 is controlled to run the pressurization to ensure that the pressure in the accumulator 30 remains constant, and then the force of the pressure rod 23 on the moving contact 22 remains basically constant, simulating the self-closing force of the vacuum circuit breaker. When the oil pressure switch 31 fails or the vacuum circuit breaker simulation device needs to be repaired, the pressure in the accumulator 30 can be relieved or overflowed through the pressure relief valve 33 or the overflow valve, and the high-pressure liquid returns to the oil tank 35 through the return oil pipe 34 to ensure the safety and reliability of the system.

[0055] The vacuum circuit breaker simulation device of this test system simulates a vacuum circuit breaker to test the operating mechanism, and can replace the vacuum circuit breaker product to carry out mechanical characteristic test and reliability test verification of the adapted operating mechanism. Based on the principle that gas is compressible but liquid is incompressible, and using the pressure accumulator structure that maintains a constant pressure with compressed gas, the output force value within the opening and closing stroke range of the simulated circuit breaker is basically kept constant, which is equivalent to the vacuum self-closing force of the vacuum circuit breaker. The equivalent mass method is used to achieve the equivalence of the moving mass. An overtravel spring is used in conjunction with a mechanical transmission mechanism to simulate the overtravel spring structure of the vacuum circuit breaker. Through the above load structure design and theoretical calculation, it is ensured that the load characteristics of the vacuum circuit breaker simulation device are basically consistent with those of the vacuum circuit breaker product, and it has the function of completing the factory test and characteristic debugging of the vacuum circuit breaker operating mechanism on the vacuum circuit breaker simulation device.

[0056] The vacuum circuit breaker simulation device replaces the insulating parts in the vacuum circuit breaker with metal parts, reducing the volume of the vacuum circuit breaker simulation device. At the same time, through the equivalent load method, there is no need for a vacuum chamber, and there is no need to consider the problem of vacuum arc chamber leakage, thereby improving the strength of transmission components, increasing the number of operations, and extending the service life, thereby improving the reliability of the vacuum circuit breaker simulation device.

[0057] The vacuum circuit breaker simulator is universal and can simulate the load characteristics of vacuum circuit breakers of all voltage levels by adjusting the equivalent mass of moving parts, accumulator pressure, overtravel spring force and other parameters. It is easy to operate, easy to install and debug, highly versatile, cost-effective, reliable to use, and has a wide range of applications, providing technical support for the research, development, promotion and application of vacuum circuit breaker operating mechanisms. It can complete fault troubleshooting and debugging of characteristic parameters required for vacuum circuit breakers before the operating mechanism leaves the factory, and then assemble, debug and test the operating mechanism and vacuum circuit breaker body, which can greatly reduce the risk of damage to the vacuum circuit breaker body, improve product quality and work efficiency, and reduce production costs, which is of great significance to the development of the vacuum circuit breaker industry.

[0058] Embodiment 2 of the vacuum circuit breaker operating mechanism test system of the present invention: The vacuum circuit breaker operating mechanism testing system in this embodiment has the same basic principle as the vacuum circuit breaker operating mechanism testing system in the above-mentioned embodiment 1. The difference is that the vacuum circuit breaker operating mechanism testing system in this embodiment expands the number of vacuum circuit breaker simulation devices to realize simultaneous simulation testing of multiple vacuum circuit breaker operating mechanisms of various voltage levels, thereby realizing the factory testing capability for mass production of products.

[0059] Specifically, combined Figure 4 In this embodiment, there are three types of vacuum circuit breaker simulation devices, namely, 72.5kV vacuum circuit breaker simulation device, 126kV vacuum circuit breaker simulation device, and 252kV vacuum circuit breaker simulation device. Other voltage levels can also be set as needed. There are multiple vacuum circuit breaker simulation devices of each voltage level, among which vacuum circuit breaker simulation devices of the same voltage level share the same pressure accumulator, and the same pressure accumulator is connected to the pressure vessels of different vacuum circuit breaker simulation devices through different connecting pipes, that is, the vacuum circuit breaker simulation devices of the same voltage level do not share parts other than the pressure accumulator, so as to facilitate the simultaneous testing of different operating mechanisms. Since the self-closing force required to be simulated by the vacuum circuit breaker simulation devices of the same voltage level is the same, the pressure accumulator is shared, which can reduce the number of parts and reduce costs.

[0060] Different pressure accumulators share a pressure boosting device, and the same pressure boosting device is connected to multiple vacuum circuit breaker simulation devices, that is, they share a set of motors, oil pumps, oil tanks, and control valves. The control valve is a three-position four-way control valve. Each pressure accumulator is connected to the corresponding interface of the control valve through a pressure boosting oil pipe, and the oil pump is used to pressurize different pressure accumulators through the passage switching of the three-position four-way control valve. The control valve and each pressure accumulator are connected to the oil line connecting the control valve and each pressure accumulator. Each pressure accumulator is equipped with an oil pressure switch. The three-position four-way control valve is controlled by the oil pressure switch signal to control the oil pressure stability of three or more vacuum circuit breaker simulation devices, which reduces the number of parts and costs, and realizes the function of controlling and maintaining constant force of multiple self-closing forces of simulated vacuum circuit breakers.

[0061] The parts of the vacuum circuit breaker simulation device in this embodiment except the pressure accumulator and the pressure accumulator shared by each vacuum circuit breaker simulation device are the same as the corresponding structures in the above embodiments and have the same working principles, which will not be repeated here.

[0062] According to the simulated self-closing force requirements of the 72.5kV vacuum circuit breaker simulator, the 126kV vacuum circuit breaker simulator, and the 252kV vacuum circuit breaker simulator, different oil pressure values ​​in each accumulator are obtained, and the working oil pressure limit force value of each oil pressure switch is adjusted. When the vacuum circuit breaker simulator of the corresponding voltage level needs to be used, the corresponding oil pressure switch is connected, the motor is powered, and the oil pump is driven to pressurize. The three-position four-way control valve controls the high-pressure oil to flow to the corresponding accumulator until the pressure of the accumulator reaches the preset pressure, the oil pressure switch switches the circuit, the motor loses power and stops pressing, the three-position four-way control valve changes direction, and the pressure in the accumulator is maintained.

[0063] When an oil leakage fault occurs during the test of the vacuum circuit breaker simulation device, causing the pressure in the accumulator to decrease, the oil pressure switch controls the motor and the corresponding three-position four-way control valve to be connected, replenishing the pressure in the corresponding circuit to ensure that the hydraulic pressure value in the accumulator is stable and the equivalent self-closing force of the simulation device remains constant.

[0064] When the vacuum circuit breaker simulator needs to be repaired, the pressure of the accumulator in the corresponding circuit can be unloaded through the pressure relief valve to ensure safety and reliability. When the three-position four-way control valve or oil pressure switch of the vacuum circuit breaker simulator is damaged, the overflow valve can be used to control it to avoid excessive energy storage pressure, which may cause equipment failure and safety problems.

[0065] Embodiment of the vacuum circuit breaker simulation device of the present invention: The vacuum circuit breaker simulation device in this embodiment is the same as the vacuum circuit breaker simulation device in the first embodiment of the vacuum circuit breaker operating mechanism test system, and will not be described in detail here.

[0066] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum circuit breaker simulation device, characterized in that: It includes a moving contact assembly and a static contact assembly. The moving contact assembly includes a moving contact piece, a force transmission rod assembly and an adapter. The adapter is used for transmission connection of the operating mechanism of the matching vacuum circuit breaker. There are three force transmission rod assemblies and each force transmission rod assembly includes two force transmission rods and an overtravel spring that transmits force between the two force transmission rods. One of the two force transmission rods of each force transmission rod assembly is connected to the same moving contact piece, and the other is connected to the adapter so that when the operating mechanism drives the moving contact assembly to move, the moving contact piece and the static contact assembly cooperate to simulate the opening and closing action.

2. The vacuum circuit breaker simulator according to claim 1, characterized in that: The force transmission rod assembly includes a connecting sleeve, and retaining walls are provided at both ends of the connecting sleeve. The retaining walls at both ends are respectively provided with through holes for avoiding the two force transmission rods, and the retaining walls at both ends are used to stop the ends of the two force transmission rods located in the connecting sleeve from escaping from the connecting sleeve. The overtravel spring is arranged in the connecting sleeve and abuts between the two force transmission rods.

3. The vacuum circuit breaker simulator according to claim 2, characterized in that: The connecting sleeve includes a spring support tube and an adjusting head threadedly connected to the tube mouth of the spring support tube. The bottom of the spring support tube and the adjusting head respectively constitute the two end retaining walls of the connecting sleeve. The overtravel spring abuts between the bottom of the spring support tube and the adjusting head to change the compression amount of the overtravel spring by screwing the adjusting head.

4. The vacuum circuit breaker simulator according to claim 1, 2 or 3, characterized in that: Each force transmission rod assembly is evenly distributed around the circumference of the center line of the moving contact assembly, and a contact portion for contacting the stationary contact assembly is provided at a portion of the moving contact member located at the center line of the moving contact assembly.

5. The vacuum circuit breaker simulator according to claim 1, 2 or 3, characterized in that: The vacuum circuit breaker simulation device comprises a base, a moving contact assembly is movably arranged on the base, a connecting piece comprises a horizontal part and a vertical part, each force transmission rod assembly is connected to the horizontal part, and a guide hole for guiding and penetrating the vertical part is arranged on the base.

6. The vacuum circuit breaker simulator according to claim 1, 2 or 3, characterized in that: The vacuum circuit breaker simulation device includes a self-closing force simulation mechanism, which includes a pressure chamber, the pressure chamber includes a liquid chamber for filling liquid and a gas chamber for filling compressed gas, a piston is provided in the pressure chamber to separate the liquid chamber and the gas chamber, the moving contact assembly has a pressure-bearing part in the liquid chamber, the pressure in the gas chamber is transmitted to the pressure-bearing part through the piston via the liquid chamber to form a simulated self-closing force on the moving contact assembly toward the static contact assembly, and the volume change of the pressure chamber caused by the movement of the pressure-bearing part when the moving contact assembly performs opening and closing movements satisfies the requirement that the simulated self-closing force is within an allowable deviation range.

7. The vacuum circuit breaker simulator according to claim 6, characterized in that: The self-closing force simulation mechanism includes a pressure container and a pressure accumulator. The pressure accumulator is connected to the pressure container through a connecting pipe. The piston is arranged in the inner cavity of the pressure accumulator. The space of the inner cavity of the pressure accumulator on one side of the piston constitutes the gas cavity. The space of the pressure accumulator on the other side of the piston and the space in the connecting pipe and the space in the pressure container are used to form the liquid cavity.

8. The vacuum circuit breaker simulator according to claim 6, characterized in that: The moving contact assembly comprises a pressure-bearing rod, one end of which is fixed on the moving contact piece, the pressure chamber comprises a sliding sealing hole for the other end of the pressure-bearing rod to extend into, and the portion of the pressure-bearing rod extending into the pressure chamber constitutes the pressure-bearing portion.

9. A vacuum circuit breaker operating mechanism test system, characterized in that: It comprises a vacuum circuit breaker simulation device and a pressure-compensating device, wherein the vacuum circuit breaker simulation device is the vacuum circuit breaker simulation device as described in claim 6, 7 or 8 above, and the pressure-compensating device comprises a liquid storage tank and a pressure-compensating pipeline connecting the liquid storage tank and the liquid cavity of the vacuum circuit breaker simulation device, and the pressure-compensating pipeline is provided with a pump for pumping liquid into the liquid cavity.

10. The vacuum circuit breaker operating mechanism testing system according to claim 9, characterized in that: The same pressure compensation device is connected to two or more vacuum circuit breaker simulation devices.

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