SF6 circuit breaker dynamic contact resistance measuring device

Abstract

The utility model discloses an SF6 breaker dynamic contact resistance measuring device comprising a cylindrical tank body and a support pedestal, the tank body is fixed above the support pedestal, two sides of the top end of the tank body are respectively provided with a transparent observation window, the tank body is internally provided with a switch mechanism, an arc extinguish chamber, a connection chamber and a conical support seat, and the arc extinguish chamber, the connection chamber and the conical support seat are fixed on the support pedestal. The switch mechanism comprises a static arc contact, a metal wire and a moving arc contact, the static arc contact and the moving arc contact are arranged in a centering mode, the arc extinguish chamber, the connecting chamber and the conical support base are sequentially and fixedly connected from top to bottom, connecting guide rods are arranged in the arc extinguish chamber and the connecting chamber, and the bottom of each connecting guide rod is fixedly connected with an insulating pull rod. The SF6 circuit breaker dynamic contact resistance measuring device adopting the above structure can simulate the opening and closing states of the moving arc contact and the static arc contact at different speeds, measure the dynamic contact resistance in the opening and closing processes, and determine the breaking performance of the SF6 circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a dynamic contact resistance measuring device for SF6 circuit breakers. Background Technology

[0002] SF6 circuit breakers utilize sulfur hexafluoride gas as both the arc-extinguishing and insulating medium. They possess excellent arc-extinguishing performance and are widely used in power systems, with demand increasing annually. SF6 circuit breakers occupy a crucial position in power systems, and their operational status has a decisive impact on the entire power grid. The contact system is a key component of the SF6 circuit breaker, consisting of main contacts and arc contacts. During circuit breaker closing, the arc contacts close first, followed by the main contacts, and the contact system determines the electric field distribution within the arc-extinguishing chamber during closing. During circuit breaker opening, the main contacts open first, followed by the arc contacts, and the contact system affects the initial gas pressure of the cylinder during breaking. Furthermore, the arc contacts primarily bear the responsibility for both closing and breaking currents; therefore, the condition of the contact system directly affects the performance and service life of the circuit breaker.

[0003] Currently, operators primarily use loop resistance testers to inspect the contact system status of SF6 circuit breakers in operation. However, loop resistance cannot reflect the movement state of the arc contacts, determine the wear condition of the arc contacts, or provide a comprehensive assessment of the circuit breaker contact status. Therefore, researchers are studying the measurement of dynamic contact resistance of SF6 circuit breakers to comprehensively understand the changes in loop resistance throughout the closing and opening processes of SF6 circuit breakers, thereby reflecting the operating status of the SF6 circuit breaker contact system.

[0004] For example, during the assembly process of an SF6 circuit breaker, misalignment of the contact system can occur, affecting the electric field distribution in the arc-extinguishing chamber and the motion characteristics of the contact system. During operation, contact system vibration can lead to severe erosion of the arc contact surface, ultimately affecting its service life. Furthermore, the shape of the arc contacts in the SF6 circuit breaker's contact system can change over long-term operation; if this is not monitored in time, it will affect the circuit breaker's breaking performance. All of these adverse conditions can be effectively reflected by measuring the dynamic contact resistance of the SF6 circuit breaker. Therefore, it is necessary to design a measuring instrument specifically for the dynamic contact resistance of circuit breakers. Utility Model Content

[0005] The purpose of this invention is to provide a dynamic contact resistance measuring device for SF6 circuit breakers, which can simulate the opening and closing states of the moving arc contact and the stationary arc contact at different speeds, measure the dynamic contact resistance during the opening and closing process, and determine the breaking performance of the SF6 circuit breaker.

[0006] A dynamic contact resistance measuring device for SF6 circuit breakers includes a tank and a support base. The tank is cylindrical and fixed above the support base. A top cover is provided on the top of the tank, and transparent observation windows are provided on both sides of the top of the tank.

[0007] Furthermore, the tank body is provided with a switching mechanism, an arc-extinguishing chamber, a connecting chamber, and a conical support base. The switching mechanism includes a stationary arc contact, a metal wire, and a moving arc contact. The stationary arc contact is fixed below the top cover, the metal wire passes through the stationary arc contact, and the stationary arc contact and the moving arc contact are centered on each other.

[0008] Furthermore, the arc-extinguishing chamber, the connecting chamber, and the conical support base are fixedly connected in sequence from top to bottom. A connecting guide rod is provided in the arc-extinguishing chamber and the connecting chamber. The moving arc contact is fixed at the top of the connecting guide rod. The connecting guide rod and the bottom are fixedly connected to the insulating pull rod.

[0009] Furthermore, the support base is provided with a partition chamber and a hydraulic mechanism. The partition chamber is fixedly connected to the support base. The insulating pull rod passes downward through the conical support base and the partition chamber. The bottom end of the insulating pull rod is fixedly connected to the piston rod of the hydraulic mechanism. An acceleration sensor is provided on the piston rod. The hydraulic mechanism is fixed to the bottom of the partition chamber.

[0010] Furthermore, a connecting pipe port is provided on the side of the connecting chamber, and one end of an output guide rod is provided inside the connecting pipe port. The other end of the output guide rod is inserted into an insulating tube. One end of the insulating tube is fixedly connected to the connecting pipe port, and the other end of the insulating tube is integrally connected to the side flange cover.

[0011] Furthermore, the output guide rod is electrically connected to the connecting guide rod via a wire passing through the connecting pipe opening. The output guide rod is connected to the power supply via a lead passing through the side flange cover, and the static arc contact is connected to the power supply via another lead.

[0012] Furthermore, an air jet cylinder is provided between the moving arc contact and the arc-extinguishing chamber, and the bottom of the air jet cylinder is fixed to the bottom surface of the arc-extinguishing chamber.

[0013] Furthermore, an air inlet is provided on the side of the tank.

[0014] Furthermore, sealing rings are provided at the connection between the tank body and the support base, and at the connection between the partition chamber and the support base. A through hole is provided in the center of the top surface of the support base for the insulating pull rod to pass through.

[0015] Furthermore, a partition plate is provided in the middle of the partition chamber, and a through hole for the piston rod to pass through is provided in the center of the partition plate, with a sealing ring provided on the circumference of the through hole.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] This utility model provides a dynamic contact resistance measuring device for SF6 circuit breakers. The device provides the motion power for the moving arc contact through a hydraulic mechanism located at the bottom and controls the closing or opening speed to test and simulate the state of the circuit breaker. The spark state and the degree of metal wire erosion can be observed through the observation window on the top of the tank. By simulating measurements of different voltages and different opening and closing speeds, a corresponding dynamic contact resistance measurement curve can be established, thereby connecting and judging the performance of the circuit breaker. Attached Figure Description

[0018] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a comparison curve of the contact resistance measured at the internal and external measuring points of this utility model.

[0021] Figure 3 This is a schematic diagram of the complete dynamic contact resistance measurement curve of this utility model;

[0022] Figure 4 This is a schematic diagram of a local measurement curve of the dynamic contact resistance of this utility model.

[0023] Figure label:

[0024] 1. Tank body; 11. Top cover; 12. Sealing ring; 13. Observation window; 14. Air inlet;

[0025] 2. Arc-extinguishing chamber; 21. Air jet cylinder; 22. Moving arc contact; 23. Stationary arc contact; 24. Metal wire;

[0026] 3. Connecting chamber; 31. Connecting pipe port; 32. Output guide rod; 33. Insulating tubing; 34. Side flange cover; 35. Connecting guide rod;

[0027] 4. Conical support base; 41. Insulating tie rod;

[0028] 5. Partitioned room; 51. Partition panel;

[0029] 6. Hydraulic mechanism; 61. Piston rod; 62. Accelerometer sensor;

[0030] 7. Support base. Detailed Implementation

[0031] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0032] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0033] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0035] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] This utility model provides a dynamic contact resistance measuring device for SF6 circuit breakers, including a tank and a support base. The tank is cylindrical and fixed above the support base. A top cover is provided on the top of the tank, and transparent observation windows are provided on both sides of the top of the tank.

[0037] The tank body is equipped with a switching mechanism, an arc-extinguishing chamber, a connecting chamber, and a conical support base. The switching mechanism includes a stationary arc contact, a metal wire, and a moving arc contact. The stationary arc contact is fixed below the top cover, and the metal wire passes through the stationary arc contact. The stationary arc contact and the moving arc contact are aligned.

[0038] The arc-extinguishing chamber, the connecting chamber, and the conical support base are fixedly connected in sequence from top to bottom. A connecting guide rod is provided in the arc-extinguishing chamber and the connecting chamber. The moving arc contact is fixed at the top of the connecting guide rod. The connecting guide rod and the bottom are fixedly connected to the insulating pull rod.

[0039] The support base is provided with a partition chamber and a hydraulic mechanism. The partition chamber is fixedly connected to the support base. The insulating rod passes downward through the conical support base and the partition chamber. The bottom end of the insulating rod is fixedly connected to the piston rod of the hydraulic mechanism. An acceleration sensor is provided on the piston rod. The hydraulic mechanism is fixed to the bottom of the partition chamber.

[0040] A connecting pipe port is provided on the side of the connecting chamber. One end of an output guide rod is provided inside the connecting pipe port. The other end of the output guide rod is inserted into an insulating tube. One end of the insulating tube is fixedly connected to the connecting pipe port, and the other end of the insulating tube is integrally connected to the side flange cover.

[0041] The output guide rod is electrically connected to the connecting guide rod via a wire passing through the connecting pipe opening. The output guide rod is connected to the power supply via a lead passing through the side flange cover. The static arc contact is connected to the power supply via another lead.

[0042] An air jet cylinder is provided between the moving arc contact and the arc-extinguishing chamber, and the bottom of the air jet cylinder is fixed to the bottom surface of the arc-extinguishing chamber.

[0043] An air inlet is provided on the side of the tank.

[0044] Sealing rings are provided at the connection between the tank body and the support base, and at the connection between the partition chamber and the support base. A through hole is provided in the center of the top surface of the support base for the insulating pull rod to pass through.

[0045] A partition plate is provided in the middle of the partition chamber, and a through hole for the piston rod to pass through is provided in the center of the partition plate. A sealing ring is provided on the circumference of the through hole.

[0046] Example 1:

[0047] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of this utility model;

[0048] like Figure 2 As shown, Figure 2 This is a comparison curve of the contact resistance measured at the internal and external measuring points of this utility model.

[0049] like Figure 3 As shown, Figure 3 This is a schematic diagram of the complete dynamic contact resistance measurement curve of this utility model;

[0050] like Figure 4 As shown, Figure 4 This is a schematic diagram of a local measurement curve of the dynamic contact resistance of this utility model.

[0051] The prototype is a 252kV GIS circuit breaker, employing a modular design to meet the basic functions of a 252kV GIS circuit breaker. For example... Figure 1 As shown, a dynamic contact resistance measuring device for an SF6 circuit breaker includes a tank 1 and a support base 7. The tank 1 is cylindrical and fixed above the support base 7. A top cover 11 is provided on the top of the tank 1, and the top cover 11 is sealed to the tank 1. Transparent circular observation windows 13 are respectively provided on both sides of the top of the tank 1. The two observation windows 13 are symmetrically arranged at 180° in the horizontal direction and have a diameter of 2800mm. The process of the arc contact closing and opening can be observed through the observation windows 13, which are used for video recording, infrared temperature measurement, etc. The observation windows 13 are marked with dimensions to show the length of the metal wire 24 during the arc ablation test.

[0052] Example 2:

[0053] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of this utility model;

[0054] like Figure 2 As shown, Figure 2 This is a comparison curve of the contact resistance measured at the internal and external measuring points of this utility model.

[0055] like Figure 3 As shown, Figure 3 This is a schematic diagram of the complete dynamic contact resistance measurement curve of this utility model;

[0056] like Figure 4 As shown, Figure 4 This is a schematic diagram of a local measurement curve of the dynamic contact resistance of this utility model.

[0057] The prototype simulated in this embodiment is a 252kV GIS circuit breaker, which adopts a modular design and meets the basic functions of a 252kV GIS circuit breaker. For example... Figure 1 As shown, a dynamic contact resistance measuring device for an SF6 circuit breaker includes a tank 1 and a support base 7. The tank 1 is cylindrical and fixed above the support base 7. A top cover 11 is provided on the top of the tank 1, and the top cover 11 is sealed to the tank 1. Transparent circular observation windows 13 are respectively provided on both sides of the top of the tank 1. The two observation windows 13 are symmetrically arranged at 180° in the horizontal direction and have a diameter of 2800mm. The process of the arc contact closing and opening can be observed through the observation windows 13, which are used for video recording, infrared temperature measurement, etc. The observation windows 13 are marked with dimensions to show the length of the metal wire 24 during the arc ablation test.

[0058] The tank 1 contains a switching mechanism, an arc-extinguishing chamber 2, a connecting chamber 3, and a conical support 4. The switching mechanism includes a stationary arc contact 23, a metal wire 24, and a moving arc contact 22. The stationary arc contact 23 is fixed below the top cover 11, and the metal wire 24 passes through it. The stationary arc contact 23 and the moving arc contact 22 are aligned. The stationary arc contact 23 has a total length of 210 mm and an outer diameter of 25 mm. The moving arc contact 22 has a total length of 84 mm, 8 contact fingers, and an inner diameter of 22.5 mm. The inner and outer diameters of the stationary and moving arc contacts differ by 2.5 mm. The measuring device proposed in this embodiment only needs to meet the requirements for measuring the dynamic contact resistance of the arc contact; therefore, it is not necessary to install a main contact or nozzle, and the tank 1 does not need to be sealed and filled with SF6 gas. This mode is mainly used for measuring the dynamic contact resistance and contact stroke of the arc contact under different currents and different opening and closing speeds; and for measuring the dynamic contact resistance and contact stroke of the arc contact under various defects. If it is to be used for closed-loop erosion and arc ablation tests or as a complete circuit breaker, simply install the corresponding components and fill them with SF6 gas.

[0059] Example 3:

[0060] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of this utility model;

[0061] like Figure 2 As shown, Figure 2 This is a comparison curve of the contact resistance measured at the internal and external measuring points of this utility model.

[0062] like Figure 3 As shown, Figure 3 This is a schematic diagram of the complete dynamic contact resistance measurement curve of this utility model;

[0063] like Figure 4 As shown, Figure 4 This is a schematic diagram of a local measurement curve of the dynamic contact resistance of this utility model.

[0064] The prototype is a 252kV GIS circuit breaker, employing a modular design to meet the basic functions of a 252kV GIS circuit breaker. For example... Figure 1 As shown, a dynamic contact resistance measuring device for an SF6 circuit breaker includes a tank 1 and a support base 7. The tank 1 is cylindrical and fixed above the support base 7. A top cover 11 is provided on the top of the tank 1, and the top cover 11 is sealed to the tank 1. Transparent circular observation windows 13 are respectively provided on both sides of the top of the tank 1. The two observation windows 13 are symmetrically arranged at 180° in the horizontal direction and have a diameter of 2800mm. The process of the arc contact closing and opening can be observed through the observation windows 13, which are used for video recording, infrared temperature measurement, etc. The observation windows 13 are marked with dimensions to show the length of the metal wire 24 during the arc ablation test.

[0065] The tank 1 contains a switching mechanism, an arc-extinguishing chamber 2, a connecting chamber 3, and a conical support 4. The switching mechanism includes a stationary arc contact 23, a metal wire 24, and a moving arc contact 22. The stationary arc contact 23 is fixed below the top cover 11, and the metal wire 24 passes through it. The stationary arc contact 23 and the moving arc contact 22 are aligned. The stationary arc contact 23 has a total length of 210 mm and an outer diameter of 25 mm. The moving arc contact 22 has a total length of 84 mm, 8 contact fingers, and an inner diameter of 22.5 mm. The inner and outer diameters of the stationary and moving arc contacts differ by 2.5 mm. The measuring device proposed in this embodiment only needs to meet the requirements for measuring the dynamic contact resistance of the arc contact; therefore, it is not necessary to install a main contact or nozzle, and the tank 1 does not need to be sealed and filled with SF6 gas. This mode is mainly used for measuring the dynamic contact resistance and contact stroke of the arc contact under different currents and different opening and closing speeds; and for measuring the dynamic contact resistance and contact stroke of the arc contact under various defects. If it is to be used for closed-loop erosion and arc ablation tests or as a complete circuit breaker, simply install the corresponding components and fill them with SF6 gas.

[0066] The arc-extinguishing chamber 2, the connecting chamber 3, and the conical support base 4 are fixedly connected from top to bottom. A jet cylinder 21 is installed between the moving arc contact 22 and the arc-extinguishing chamber 2, and the bottom of the jet cylinder 21 is fixed to the bottom surface of the arc-extinguishing chamber 2. A connecting guide rod 35 is installed inside the arc-extinguishing chamber 2 and the connecting chamber 3. The moving arc contact 22 is installed on the top of the connecting guide rod 35, and the bottom of the connecting guide rod 35 is fixedly connected to the insulating pull rod 41. The connecting guide rod 35 provides power to the moving arc contact 22 and transmits current.

[0067] Example 4:

[0068] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of this utility model;

[0069] like Figure 2 As shown, Figure 2This is a comparison curve of the contact resistance measured at the internal and external measuring points of this utility model.

[0070] like Figure 3 As shown, Figure 3 This is a schematic diagram of the complete dynamic contact resistance measurement curve of this utility model;

[0071] like Figure 4 As shown, Figure 4 This is a schematic diagram of a local measurement curve of the dynamic contact resistance of this utility model.

[0072] The prototype is a 252kV GIS circuit breaker, employing a modular design to meet the basic functions of a 252kV GIS circuit breaker. For example... Figure 1 As shown, a dynamic contact resistance measuring device for an SF6 circuit breaker includes a tank 1 and a support base 7. The tank 1 is cylindrical and fixed above the support base 7. A top cover 11 is provided on the top of the tank 1, and the top cover 11 is sealed to the tank 1. Transparent circular observation windows 13 are respectively provided on both sides of the top of the tank 1. The two observation windows 13 are symmetrically arranged at 180° in the horizontal direction and have a diameter of 2800mm. The process of the arc contact closing and opening can be observed through the observation windows 13, which are used for video recording, infrared temperature measurement, etc. The observation windows 13 are marked with dimensions to show the length of the metal wire 24 during the arc ablation test.

[0073] The tank 1 contains a switching mechanism, an arc-extinguishing chamber 2, a connecting chamber 3, and a conical support 4. The switching mechanism includes a stationary arc contact 23, a metal wire 24, and a moving arc contact 22. The stationary arc contact 23 is fixed below the top cover 11, and the metal wire 24 passes through it. The stationary arc contact 23 and the moving arc contact 22 are aligned. The stationary arc contact 23 has a total length of 210 mm and an outer diameter of 25 mm. The moving arc contact 22 has a total length of 84 mm, 8 contact fingers, and an inner diameter of 22.5 mm. The inner and outer diameters of the stationary and moving arc contacts differ by 2.5 mm. The measuring device proposed in this embodiment only needs to meet the requirements for measuring the dynamic contact resistance of the arc contact; therefore, it is not necessary to install a main contact or nozzle, and the tank 1 does not need to be sealed and filled with SF6 gas. This mode is mainly used for measuring the dynamic contact resistance and contact stroke of the arc contact under different currents and different opening and closing speeds; and for measuring the dynamic contact resistance and contact stroke of the arc contact under various defects. If it is to be used for closed-loop erosion and arc ablation tests or as a complete circuit breaker, simply install the corresponding components and fill them with SF6 gas.

[0074] The arc-extinguishing chamber 2, the connecting chamber 3, and the conical support base 4 are fixedly connected from top to bottom. A jet cylinder 21 is installed between the moving arc contact 22 and the arc-extinguishing chamber 2, and the bottom of the jet cylinder 21 is fixed to the bottom surface of the arc-extinguishing chamber 2. A connecting guide rod 35 is installed inside the arc-extinguishing chamber 2 and the connecting chamber 3. The moving arc contact 22 is installed on the top of the connecting guide rod 35, and the bottom of the connecting guide rod 35 is fixedly connected to the insulating pull rod 41. The connecting guide rod 35 provides power to the moving arc contact 22 and transmits current.

[0075] A connecting port 31 is provided on the side of the connecting chamber 3. One end of the output guide rod 32 is installed inside the connecting port 31, and the other end of the output guide rod 32 is inserted into the insulating tube 33. One end of the insulating tube 33 is fixedly connected to the connecting port 31, and the other end of the insulating tube 33 is integrally connected to the side flange cover 34. The output guide rod 32 is electrically connected to the connecting guide rod 35 through a wire passing through the connecting port 31. The output guide rod 32 is connected to the power supply through a lead passing through the side flange cover 34. The static arc contact 23 is connected to the power supply through another lead. The connecting port 31, the insulating tube 33, and the side flange cover 34 enclose the output guide rod 32 to prevent high voltage leakage.

[0076] Example 5:

[0077] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of this utility model;

[0078] like Figure 2 As shown, Figure 2 This is a comparison curve of the contact resistance measured at the internal and external measuring points of this utility model.

[0079] like Figure 3 As shown, Figure 3 This is a schematic diagram of the complete dynamic contact resistance measurement curve of this utility model;

[0080] like Figure 4 As shown, Figure 4 This is a schematic diagram of a local measurement curve of the dynamic contact resistance of this utility model.

[0081] The prototype is a 252kV GIS circuit breaker, employing a modular design to meet the basic functions of a 252kV GIS circuit breaker. For example... Figure 1As shown, a dynamic contact resistance measuring device for an SF6 circuit breaker includes a tank 1 and a support base 7. The tank 1 is cylindrical and fixed above the support base 7. A top cover 11 is provided on the top of the tank 1, and the top cover 11 is sealed to the tank 1. Transparent circular observation windows 13 are respectively provided on both sides of the top of the tank 1. The two observation windows 13 are symmetrically arranged at 180° in the horizontal direction and have a diameter of 2800mm. The process of the arc contact closing and opening can be observed through the observation windows 13, which are used for video recording, infrared temperature measurement, etc. The observation windows 13 are marked with dimensions to show the length of the metal wire 24 during the arc ablation test.

[0082] The tank 1 contains a switching mechanism, an arc-extinguishing chamber 2, a connecting chamber 3, and a conical support 4. The switching mechanism includes a stationary arc contact 23, a metal wire 24, and a moving arc contact 22. The stationary arc contact 23 is fixed below the top cover 11, and the metal wire 24 passes through it. The stationary arc contact 23 and the moving arc contact 22 are aligned. The stationary arc contact 23 has a total length of 210 mm and an outer diameter of 25 mm. The moving arc contact 22 has a total length of 84 mm, 8 contact fingers, and an inner diameter of 22.5 mm. The inner and outer diameters of the stationary and moving arc contacts differ by 2.5 mm. The measuring device proposed in this embodiment only needs to meet the requirements for measuring the dynamic contact resistance of the arc contact; therefore, it is not necessary to install a main contact or nozzle, and the tank 1 does not need to be sealed and filled with SF6 gas. This mode is mainly used for measuring the dynamic contact resistance and contact stroke of the arc contact under different currents and different opening and closing speeds; and for measuring the dynamic contact resistance and contact stroke of the arc contact under various defects. If it is to be used for closed-loop erosion and arc ablation tests or as a complete circuit breaker, simply install the corresponding components and fill them with SF6 gas.

[0083] The arc-extinguishing chamber 2, the connecting chamber 3, and the conical support base 4 are fixedly connected from top to bottom. A jet cylinder 21 is installed between the moving arc contact 22 and the arc-extinguishing chamber 2, and the bottom of the jet cylinder 21 is fixed to the bottom surface of the arc-extinguishing chamber 2. A connecting guide rod 35 is installed inside the arc-extinguishing chamber 2 and the connecting chamber 3. The moving arc contact 22 is installed on the top of the connecting guide rod 35, and the bottom of the connecting guide rod 35 is fixedly connected to the insulating pull rod 41. The connecting guide rod 35 provides power to the moving arc contact 22 and transmits current.

[0084] A connecting port 31 is provided on the side of the connecting chamber 3. One end of the output guide rod 32 is installed inside the connecting port 31, and the other end of the output guide rod 32 is inserted into the insulating tube 33. One end of the insulating tube 33 is fixedly connected to the connecting port 31, and the other end of the insulating tube 33 is integrally connected to the side flange cover 34. The output guide rod 32 is electrically connected to the connecting guide rod 35 through a wire passing through the connecting port 31. The output guide rod 32 is connected to the power supply through a lead passing through the side flange cover 34. The static arc contact 23 is connected to the power supply through another lead. The connecting port 31, the insulating tube 33, and the side flange cover 34 enclose the output guide rod 32 to prevent high voltage leakage.

[0085] There are two suitable locations for measuring dynamic contact resistance: an internal measuring point and an external measuring point. The internal measuring point is connected to the moving arc contact 22, and the external measuring point is connected to the output lead of the side flange cover 34. The internal measuring point is in direct contact with the moving arc contact 22, resulting in more accurate measurements. However, if the switch is filled with SF6 gas, the sealed structure of the tank 1 increases the workload of disassembling the switch. If the external measuring point is used, the resistance of the output guide rod 32 and its connecting structure will inevitably affect the measurement results of the dynamic contact resistance. Therefore, by comparing the measurement differences obtained from the internal and external measuring points during the dynamic contact resistance measurement process, the influence of the connection structure between the output guide rod 32 and the moving arc contact 22 on the measurement results of the dynamic contact resistance can be obtained. This value can be used to correct the error caused by measuring the dynamic contact resistance through the external measuring point when the circuit breaker switch is filled with SF6 gas. Figure 2 As shown, when the measured current is 1100A, the static contact resistance of the circuit measured from the external measuring point is approximately 40uΩ, and the dynamic contact resistance is approximately between 50-200uΩ; the static contact resistance of the circuit measured from the internal measuring point is approximately 15uΩ, and the dynamic contact resistance is approximately between 20-150uΩ. The difference in contact resistance between the two is approximately 25uΩ, and after multiple measurements, the difference between the internal and external measurements is relatively stable.

[0086] Example 6:

[0087] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of this utility model;

[0088] like Figure 2 As shown, Figure 2 This is a comparison curve of the contact resistance measured at the internal and external measuring points of this utility model.

[0089] like Figure 3 As shown, Figure 3 This is a schematic diagram of the complete dynamic contact resistance measurement curve of this utility model;

[0090] like Figure 4 As shown, Figure 4This is a schematic diagram of a local measurement curve of the dynamic contact resistance of this utility model.

[0091] The prototype is a 252kV GIS circuit breaker, employing a modular design to meet the basic functions of a 252kV GIS circuit breaker. For example... Figure 1 As shown, a dynamic contact resistance measuring device for an SF6 circuit breaker includes a tank 1 and a support base 7. The tank 1 is cylindrical and fixed above the support base 7. A top cover 11 is provided on the top of the tank 1, and the top cover 11 is sealed to the tank 1. Transparent circular observation windows 13 are respectively provided on both sides of the top of the tank 1. The two observation windows 13 are symmetrically arranged at 180° in the horizontal direction and have a diameter of 2800mm. The process of the arc contact closing and opening can be observed through the observation windows 13, which are used for video recording, infrared temperature measurement, etc. The observation windows 13 are marked with dimensions to show the length of the metal wire 24 during the arc ablation test.

[0092] The tank 1 contains a switching mechanism, an arc-extinguishing chamber 2, a connecting chamber 3, and a conical support 4. The switching mechanism includes a stationary arc contact 23, a metal wire 24, and a moving arc contact 22. The stationary arc contact 23 is fixed below the top cover 11, and the metal wire 24 passes through it. The stationary arc contact 23 and the moving arc contact 22 are aligned. The stationary arc contact 23 has a total length of 210 mm and an outer diameter of 25 mm. The moving arc contact 22 has a total length of 84 mm, 8 contact fingers, and an inner diameter of 22.5 mm. The inner and outer diameters of the stationary and moving arc contacts differ by 2.5 mm. The measuring device proposed in this embodiment only needs to meet the requirements for measuring the dynamic contact resistance of the arc contact; therefore, it is not necessary to install a main contact or nozzle, and the tank 1 does not need to be sealed and filled with SF6 gas. This mode is mainly used for measuring the dynamic contact resistance and contact stroke of the arc contact under different currents and different opening and closing speeds; and for measuring the dynamic contact resistance and contact stroke of the arc contact under various defects. If it is to be used for closed-loop erosion and arc ablation tests or as a complete circuit breaker, simply install the corresponding components and fill them with SF6 gas.

[0093] The arc-extinguishing chamber 2, the connecting chamber 3, and the conical support base 4 are fixedly connected from top to bottom. A jet cylinder 21 is installed between the moving arc contact 22 and the arc-extinguishing chamber 2, and the bottom of the jet cylinder 21 is fixed to the bottom surface of the arc-extinguishing chamber 2. A connecting guide rod 35 is installed inside the arc-extinguishing chamber 2 and the connecting chamber 3. The moving arc contact 22 is installed on the top of the connecting guide rod 35, and the bottom of the connecting guide rod 35 is fixedly connected to the insulating pull rod 41. The connecting guide rod 35 provides power to the moving arc contact 22 and transmits current.

[0094] A connecting port 31 is provided on the side of the connecting chamber 3. One end of the output guide rod 32 is installed inside the connecting port 31, and the other end of the output guide rod 32 is inserted into the insulating tube 33. One end of the insulating tube 33 is fixedly connected to the connecting port 31, and the other end of the insulating tube 33 is integrally connected to the side flange cover 34. The output guide rod 32 is electrically connected to the connecting guide rod 35 through a wire passing through the connecting port 31. The output guide rod 32 is connected to the power supply through a lead passing through the side flange cover 34. The static arc contact 23 is connected to the power supply through another lead. The connecting port 31, the insulating tube 33, and the side flange cover 34 enclose the output guide rod 32 to prevent high voltage leakage.

[0095] There are two suitable locations for measuring dynamic contact resistance: an internal measuring point and an external measuring point. The internal measuring point is connected to the moving arc contact 22, and the external measuring point is connected to the output lead of the side flange cover 34. The internal measuring point is in direct contact with the moving arc contact 22, resulting in more accurate measurements. However, if the switch is filled with SF6 gas, the sealed structure of the tank 1 increases the workload of disassembling the switch. If the external measuring point is used, the resistance of the output guide rod 32 and its connecting structure will inevitably affect the measurement results of the dynamic contact resistance. Therefore, by comparing the measurement differences obtained from the internal and external measuring points during the dynamic contact resistance measurement process, the influence of the connection structure between the output guide rod 32 and the moving arc contact 22 on the measurement results of the dynamic contact resistance can be obtained. This value can be used to correct the error caused by measuring the dynamic contact resistance through the external measuring point when the circuit breaker switch is filled with SF6 gas. Figure 2 As shown, when the measured current is 1100A, the static contact resistance of the circuit measured from the external measuring point is approximately 40uΩ, and the dynamic contact resistance is approximately between 50-200uΩ; the static contact resistance of the circuit measured from the internal measuring point is approximately 15uΩ, and the dynamic contact resistance is approximately between 20-150uΩ. The difference in contact resistance between the two is approximately 25uΩ, and after multiple measurements, the difference between the internal and external measurements is relatively stable.

[0096] The support base 7 contains a partition chamber 5 and a hydraulic mechanism 6, with the partition chamber 5 fixed below the support base 7. An insulating pull rod 41 passes downwards through the conical support base 4 and the partition chamber 5. The bottom end of the insulating pull rod 41 is fixedly connected to the piston rod 61 of the hydraulic mechanism 6, with sufficient insulation distance maintained to prevent high-voltage electricity from entering the piston rod 61. The hydraulic mechanism 6 is fixed to the bottom of the partition chamber 5 with screws. When the hydraulic mechanism 6 is activated, it provides power to the insulating pull rod 41 and the connecting guide rod 35 via the piston rod 61. The hydraulic mechanism 6 provides precise control of the pulling force, meeting the requirements for providing small-scale displacement. Installing an acceleration sensor 62 on the piston rod 61 enables precise control and statistical analysis of the displacement.

[0097] Example 7:

[0098] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of this utility model;

[0099] like Figure 2 As shown, Figure 2 This is a comparison curve of the contact resistance measured at the internal and external measuring points of this utility model.

[0100] like Figure 3 As shown, Figure 3 This is a schematic diagram of the complete dynamic contact resistance measurement curve of this utility model;

[0101] like Figure 4 As shown, Figure 4 This is a schematic diagram of a local measurement curve of the dynamic contact resistance of this utility model.

[0102] The prototype is a 252kV GIS circuit breaker, employing a modular design to meet the basic functions of a 252kV GIS circuit breaker. For example... Figure 1 As shown, a dynamic contact resistance measuring device for an SF6 circuit breaker includes a tank 1 and a support base 7. The tank 1 is cylindrical and fixed above the support base 7. A top cover 11 is provided on the top of the tank 1, and the top cover 11 is sealed to the tank 1. Transparent circular observation windows 13 are respectively provided on both sides of the top of the tank 1. The two observation windows 13 are symmetrically arranged at 180° in the horizontal direction and have a diameter of 2800mm. The process of the arc contact closing and opening can be observed through the observation windows 13, which are used for video recording, infrared temperature measurement, etc. The observation windows 13 are marked with dimensions to show the length of the metal wire 24 during the arc ablation test.

[0103] The tank 1 contains a switching mechanism, an arc-extinguishing chamber 2, a connecting chamber 3, and a conical support 4. The switching mechanism includes a stationary arc contact 23, a metal wire 24, and a moving arc contact 22. The stationary arc contact 23 is fixed below the top cover 11, and the metal wire 24 passes through it. The stationary arc contact 23 and the moving arc contact 22 are aligned. The stationary arc contact 23 has a total length of 210 mm and an outer diameter of 25 mm. The moving arc contact 22 has a total length of 84 mm, 8 contact fingers, and an inner diameter of 22.5 mm. The inner and outer diameters of the stationary and moving arc contacts differ by 2.5 mm. The measuring device proposed in this embodiment only needs to meet the requirements for measuring the dynamic contact resistance of the arc contact; therefore, it is not necessary to install a main contact or nozzle, and the tank 1 does not need to be sealed and filled with SF6 gas. This mode is mainly used for measuring the dynamic contact resistance and contact stroke of the arc contact under different currents and different opening and closing speeds; and for measuring the dynamic contact resistance and contact stroke of the arc contact under various defects. If it is to be used for closed-loop erosion and arc ablation tests or as a complete circuit breaker, simply install the corresponding components and fill them with SF6 gas.

[0104] The arc-extinguishing chamber 2, the connecting chamber 3, and the conical support base 4 are fixedly connected from top to bottom. A jet cylinder 21 is installed between the moving arc contact 22 and the arc-extinguishing chamber 2, and the bottom of the jet cylinder 21 is fixed to the bottom surface of the arc-extinguishing chamber 2. A connecting guide rod 35 is installed inside the arc-extinguishing chamber 2 and the connecting chamber 3. The moving arc contact 22 is installed on the top of the connecting guide rod 35, and the bottom of the connecting guide rod 35 is fixedly connected to the insulating pull rod 41. The connecting guide rod 35 provides power to the moving arc contact 22 and transmits current.

[0105] A connecting port 31 is provided on the side of the connecting chamber 3. One end of the output guide rod 32 is installed inside the connecting port 31, and the other end of the output guide rod 32 is inserted into the insulating tube 33. One end of the insulating tube 33 is fixedly connected to the connecting port 31, and the other end of the insulating tube 33 is integrally connected to the side flange cover 34. The output guide rod 32 is electrically connected to the connecting guide rod 35 through a wire passing through the connecting port 31. The output guide rod 32 is connected to the power supply through a lead passing through the side flange cover 34. The static arc contact 23 is connected to the power supply through another lead. The connecting port 31, the insulating tube 33, and the side flange cover 34 enclose the output guide rod 32 to prevent high voltage leakage.

[0106] There are two suitable locations for measuring dynamic contact resistance: an internal measuring point and an external measuring point. The internal measuring point is connected to the moving arc contact 22, and the external measuring point is connected to the output lead of the side flange cover 34. The internal measuring point is in direct contact with the moving arc contact 22, resulting in more accurate measurements. However, if the switch is filled with SF6 gas, the sealed structure of the tank 1 increases the workload of disassembling the switch. If the external measuring point is used, the resistance of the output guide rod 32 and its connecting structure will inevitably affect the measurement results of the dynamic contact resistance. Therefore, by comparing the measurement differences obtained from the internal and external measuring points during the dynamic contact resistance measurement process, the influence of the connection structure between the output guide rod 32 and the moving arc contact 22 on the measurement results of the dynamic contact resistance can be obtained. This value can be used to correct the error caused by measuring the dynamic contact resistance through the external measuring point when the circuit breaker switch is filled with SF6 gas. Figure 2 As shown, when the measured current is 1100A, the static contact resistance of the circuit measured from the external measuring point is approximately 40uΩ, and the dynamic contact resistance is approximately between 50-200uΩ; the static contact resistance of the circuit measured from the internal measuring point is approximately 15uΩ, and the dynamic contact resistance is approximately between 20-150uΩ. The difference in contact resistance between the two is approximately 25uΩ, and after multiple measurements, the difference between the internal and external measurements is relatively stable.

[0107] The support base 7 contains a partition chamber 5 and a hydraulic mechanism 6, with the partition chamber 5 fixed below the support base 7. An insulating pull rod 41 passes downwards through the conical support base 4 and the partition chamber 5. The bottom end of the insulating pull rod 41 is fixedly connected to the piston rod 61 of the hydraulic mechanism 6, with sufficient insulation distance maintained to prevent high-voltage electricity from entering the piston rod 61. The hydraulic mechanism 6 is fixed to the bottom of the partition chamber 5 with screws. When the hydraulic mechanism 6 is activated, it provides power to the insulating pull rod 41 and the connecting guide rod 35 via the piston rod 61. The hydraulic mechanism 6 provides precise control of the pulling force, meeting the requirements for providing small-scale displacement. Installing an acceleration sensor 62 on the piston rod 61 enables precise control and statistical analysis of the displacement.

[0108] A gas inlet 14 is provided on the side of the tank body 1 for filling with SF6 gas. Sealing rings 12 are provided at the connection between the tank body 1 and the support base 7, and at the connection between the partition chamber 5 and the support base 7. A through hole for the insulating pull rod 41 to pass through is provided in the center of the top surface of the support base 7. A partition plate 51 is provided in the middle of the partition chamber 5, and a through hole for the piston rod 61 to pass through is provided in the center of the partition plate 51. A sealing ring 12 is provided on the circumference of the through hole. The sealing rings 12 are used to ensure the airtightness of the tank body 1 structure and meet the circuit breaker simulation requirements during internal gas filling. To facilitate the disassembly and modification of the circuit breaker switch, the connection structure between each component is fixed by detachable screws or threaded connections, but the connection points are subjected to airtightness treatment and testing to ensure the airtightness of the internal environment of the tank body 1.

[0109] Example 8:

[0110] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of this utility model;

[0111] like Figure 2 As shown, Figure 2 This is a comparison curve of the contact resistance measured at the internal and external measuring points of this utility model.

[0112] like Figure 3 As shown, Figure 3 This is a schematic diagram of the complete dynamic contact resistance measurement curve of this utility model;

[0113] like Figure 4 As shown, Figure 4 This is a schematic diagram of a local measurement curve of the dynamic contact resistance of this utility model.

[0114] The prototype is a 252kV GIS circuit breaker, employing a modular design to meet the basic functions of a 252kV GIS circuit breaker. For example... Figure 1As shown, a dynamic contact resistance measuring device for an SF6 circuit breaker includes a tank 1 and a support base 7. The tank 1 is cylindrical and fixed above the support base 7. A top cover 11 is provided on the top of the tank 1, and the top cover 11 is sealed to the tank 1. Transparent circular observation windows 13 are respectively provided on both sides of the top of the tank 1. The two observation windows 13 are symmetrically arranged at 180° in the horizontal direction and have a diameter of 2800mm. The process of the arc contact closing and opening can be observed through the observation windows 13, which are used for video recording, infrared temperature measurement, etc. The observation windows 13 are marked with dimensions to show the length of the metal wire 24 during the arc ablation test.

[0115] The tank 1 contains a switching mechanism, an arc-extinguishing chamber 2, a connecting chamber 3, and a conical support 4. The switching mechanism includes a stationary arc contact 23, a metal wire 24, and a moving arc contact 22. The stationary arc contact 23 is fixed below the top cover 11, and the metal wire 24 passes through it. The stationary arc contact 23 and the moving arc contact 22 are aligned. The stationary arc contact 23 has a total length of 210 mm and an outer diameter of 25 mm. The moving arc contact 22 has a total length of 84 mm, 8 contact fingers, and an inner diameter of 22.5 mm. The inner and outer diameters of the stationary and moving arc contacts differ by 2.5 mm. The measuring device proposed in this embodiment only needs to meet the requirements for measuring the dynamic contact resistance of the arc contact; therefore, it is not necessary to install a main contact or nozzle, and the tank 1 does not need to be sealed and filled with SF6 gas. This mode is mainly used for measuring the dynamic contact resistance and contact stroke of the arc contact under different currents and different opening and closing speeds; and for measuring the dynamic contact resistance and contact stroke of the arc contact under various defects. If it is to be used for closed-loop erosion and arc ablation tests or as a complete circuit breaker, simply install the corresponding components and fill them with SF6 gas.

[0116] The arc-extinguishing chamber 2, the connecting chamber 3, and the conical support base 4 are fixedly connected from top to bottom. A jet cylinder 21 is installed between the moving arc contact 22 and the arc-extinguishing chamber 2, and the bottom of the jet cylinder 21 is fixed to the bottom surface of the arc-extinguishing chamber 2. A connecting guide rod 35 is installed inside the arc-extinguishing chamber 2 and the connecting chamber 3. The moving arc contact 22 is installed on the top of the connecting guide rod 35, and the bottom of the connecting guide rod 35 is fixedly connected to the insulating pull rod 41. The connecting guide rod 35 provides power to the moving arc contact 22 and transmits current.

[0117] A connecting port 31 is provided on the side of the connecting chamber 3. One end of the output guide rod 32 is installed inside the connecting port 31, and the other end of the output guide rod 32 is inserted into the insulating tube 33. One end of the insulating tube 33 is fixedly connected to the connecting port 31, and the other end of the insulating tube 33 is integrally connected to the side flange cover 34. The output guide rod 32 is electrically connected to the connecting guide rod 35 through a wire passing through the connecting port 31. The output guide rod 32 is connected to the power supply through a lead passing through the side flange cover 34. The static arc contact 23 is connected to the power supply through another lead. The connecting port 31, the insulating tube 33, and the side flange cover 34 enclose the output guide rod 32 to prevent high voltage leakage.

[0118] There are two suitable locations for measuring dynamic contact resistance: an internal measuring point and an external measuring point. The internal measuring point is connected to the moving arc contact 22, and the external measuring point is connected to the output lead of the side flange cover 34. The internal measuring point is in direct contact with the moving arc contact 22, resulting in more accurate measurements. However, if the switch is filled with SF6 gas, the sealed structure of the tank 1 increases the workload of disassembling the switch. If the external measuring point is used, the resistance of the output guide rod 32 and its connecting structure will inevitably affect the measurement results of the dynamic contact resistance. Therefore, by comparing the measurement differences obtained from the internal and external measuring points during the dynamic contact resistance measurement process, the influence of the connection structure between the output guide rod 32 and the moving arc contact 22 on the measurement results of the dynamic contact resistance can be obtained. This value can be used to correct the error caused by measuring the dynamic contact resistance through the external measuring point when the circuit breaker switch is filled with SF6 gas. Figure 2 As shown, when the measured current is 1100A, the static contact resistance of the circuit measured from the external measuring point is approximately 40uΩ, and the dynamic contact resistance is approximately between 50-200uΩ; the static contact resistance of the circuit measured from the internal measuring point is approximately 15uΩ, and the dynamic contact resistance is approximately between 20-150uΩ. The difference in contact resistance between the two is approximately 25uΩ, and after multiple measurements, the difference between the internal and external measurements is relatively stable.

[0119] The support base 7 contains a partition chamber 5 and a hydraulic mechanism 6, with the partition chamber 5 fixed below the support base 7. An insulating pull rod 41 passes downwards through the conical support base 4 and the partition chamber 5. The bottom end of the insulating pull rod 41 is fixedly connected to the piston rod 61 of the hydraulic mechanism 6, with sufficient insulation distance maintained to prevent high-voltage electricity from entering the piston rod 61. The hydraulic mechanism 6 is fixed to the bottom of the partition chamber 5 with screws. When the hydraulic mechanism 6 is activated, it provides power to the insulating pull rod 41 and the connecting guide rod 35 via the piston rod 61. The hydraulic mechanism 6 provides precise control of the pulling force, meeting the requirements for providing small-scale displacement. Installing an acceleration sensor 62 on the piston rod 61 enables precise control and statistical analysis of the displacement.

[0120] A gas inlet 14 is provided on the side of the tank body 1 for filling with SF6 gas. Sealing rings 12 are provided at the connection between the tank body 1 and the support base 7, and at the connection between the partition chamber 5 and the support base 7. A through hole for the insulating pull rod 41 to pass through is provided in the center of the top surface of the support base 7. A partition plate 51 is provided in the middle of the partition chamber 5, and a through hole for the piston rod 61 to pass through is provided in the center of the partition plate 51. A sealing ring 12 is provided on the circumference of the through hole. The sealing rings 12 are used to ensure the airtightness of the tank body 1 structure and meet the circuit breaker simulation requirements during internal gas filling. To facilitate the disassembly and modification of the circuit breaker switch, the connection structure between each component is fixed by detachable screws or threaded connections, but the connection points are subjected to airtightness treatment and testing to ensure the airtightness of the internal environment of the tank body 1.

[0121] The measuring device measures dynamic contact resistance using a closing-opening process. During the closing and opening phase, the device remains stationary for 350ms. The main measured signals include displacement, voltage, current, and resistance. (See attached image.) Figure 3 During the initial closing phase, the current rises sharply, the voltage drops, resistance appears, and the displacement continuously changes. When the displacement stops, the circuit breaker is considered fully closed, and the period from the initial closing to the point where the displacement stops is considered the closing dynamic contact resistance. During opening, the displacement begins to change again, the current gradually decreases to zero, the voltage rises, and the resistance rises to infinity. The period from the displacement change point to the abrupt change in resistance is considered the opening dynamic contact resistance. See [link to relevant documentation]. Figure 4 .

[0122] Specifically, this embodiment of the invention provides the motion power to the moving arc contact 22 through a hydraulic mechanism 6 located at the bottom, and controls the closing or opening speed to test and simulate the state of the circuit breaker. The spark state and the degree of ablation of the metal wire 24 are observed through the observation window 13 on the top of the tank 1. By simulating measurements at different voltages and different closing and opening speeds, a corresponding dynamic contact resistance measurement curve can be established, thereby connecting and judging the performance of the circuit breaker. This measuring device is suitable for various measurement scenarios and can be flexibly adjusted according to measurement requirements.

[0123] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A dynamic contact resistance measuring device for SF6 circuit breakers, characterized in that, It includes a tank body and a support base. The tank body is cylindrical and fixed above the support base. The top of the tank body is provided with a top cover, and transparent observation windows are provided on both sides of the top of the tank body.

2. The dynamic contact resistance measuring device for SF6 circuit breakers according to claim 1, characterized in that, The tank body is equipped with a switching mechanism, an arc-extinguishing chamber, a connecting chamber, and a conical support base. The switching mechanism includes a stationary arc contact, a metal wire, and a moving arc contact. The stationary arc contact is fixed below the top cover, and the metal wire passes through the stationary arc contact. The stationary arc contact and the moving arc contact are aligned.

3. The dynamic contact resistance measuring device for SF6 circuit breakers according to claim 2, characterized in that, The arc-extinguishing chamber, the connecting chamber, and the conical support base are fixedly connected in sequence from top to bottom. A connecting guide rod is provided in the arc-extinguishing chamber and the connecting chamber. The moving arc contact is fixed at the top of the connecting guide rod. The connecting guide rod and the bottom are fixedly connected to the insulating pull rod.

4. The dynamic contact resistance measuring device for SF6 circuit breakers according to claim 3, characterized in that, The support base is provided with a partition chamber and a hydraulic mechanism. The partition chamber is fixedly connected to the support base. The insulating rod passes downward through the conical support base and the partition chamber. The bottom end of the insulating rod is fixedly connected to the piston rod of the hydraulic mechanism. An acceleration sensor is provided on the piston rod. The hydraulic mechanism is fixed to the bottom of the partition chamber.

5. The dynamic contact resistance measuring device for SF6 circuit breakers according to claim 4, characterized in that, A connecting pipe port is provided on the side of the connecting chamber. One end of an output guide rod is provided inside the connecting pipe port. The other end of the output guide rod is inserted into an insulating tube. One end of the insulating tube is fixedly connected to the connecting pipe port, and the other end of the insulating tube is integrally connected to the side flange cover.

6. The dynamic contact resistance measuring device for SF6 circuit breakers according to claim 5, characterized in that, The output guide rod is electrically connected to the connecting guide rod via a wire passing through the connecting pipe opening. The output guide rod is connected to the power supply via a lead passing through the side flange cover. The static arc contact is connected to the power supply via another lead.

7. The dynamic contact resistance measuring device for SF6 circuit breakers according to claim 6, characterized in that, An air jet cylinder is provided between the moving arc contact and the arc-extinguishing chamber, and the bottom of the air jet cylinder is fixed to the bottom surface of the arc-extinguishing chamber.

8. The dynamic contact resistance measuring device for SF6 circuit breakers according to claim 7, characterized in that, An air inlet is provided on the side of the tank.

9. The dynamic contact resistance measuring device for SF6 circuit breakers according to claim 7, characterized in that, Sealing rings are provided at the connection between the tank body and the support base, and at the connection between the partition chamber and the support base. A through hole is provided in the center of the top surface of the support base for the insulating pull rod to pass through.

10. The dynamic contact resistance measuring device for SF6 circuit breakers according to claim 9, characterized in that, A partition plate is provided in the middle of the partition chamber, and a through hole for the piston rod to pass through is provided in the center of the partition plate. A sealing ring is provided on the circumference of the through hole.

Images