Vacuum circuit breaker self-closing force test method and device

Abstract

The invention relates to a vacuum circuit breaker self-closing force testing method and device.The vacuum circuit breaker self-closing force testing device comprises a heavy object assembly, a force measuring assembly and a height adjusting assembly, the force measuring assembly is detachably connected with a conducting rod of a vacuum circuit breaker and at least one heavy object, and the height adjusting assembly is provided with an adjusting piece and a supporting piece; the supporting piece is arranged on the adjusting piece and can support at least one heavy object, and the adjusting piece is configured to adjust the distance between the supporting piece and the vacuum detachable arc extinguish chamber; according to the method and the device for testing the self-closing force of the vacuum circuit breaker, the force far away from the static contact is directly applied to the moving contact, so that the set opening distance is formed between the moving contact and the static contact, and the self-closing force of the vacuum detachable arc extinguish chamber at the set opening distance is calculated according to the weight of the moving contact and the conductive rod; the vacuum circuit breaker can effectively detect the self-closing force of the vacuum detachable arc extinguish chamber under different opening distances without opening the vacuum detachable arc extinguish chamber.

Description

Technical Field

[0001] The present application relates to the technical field of a method and device for testing the self-closing force of a vacuum circuit breaker, and in particular to a method and device for testing the self-closing force of a vacuum circuit breaker. Background Art

[0002] Vacuum circuit breakers are widely used in power systems to control the opening and closing of circuits in high voltage and high current environments. At present, with the increase in the voltage level of vacuum circuit breakers, the volume of key components such as contacts, conductive rods and bellows will also increase accordingly, and the increase in the area of ​​the bellows will cause the contact self-closing force formed by the pressure difference to increase significantly. The existence of self-closing force is an important factor to ensure that the vacuum circuit breaker can quickly and reliably restore the closed state after disconnecting the circuit. Therefore, it is very important to make vacuum circuit breakers with different voltage levels have matching self-closing forces.

[0003] However, the prior art lacks an effective detection method and device for the self-closing force of a large-volume detachable vacuum arc-extinguishing chamber at different opening distances, which in turn affects the optimal design of a high-voltage vacuum circuit breaker. Summary of the invention

[0004] Based on this, it is necessary to provide a vacuum circuit breaker self-closing force testing method and device to address the above-mentioned lack of an effective detection method and device for the self-closing force of a large-volume vacuum detachable arc extinguishing chamber at different opening distances.

[0005] According to one aspect of the present application, a method for testing the self-closing force of a vacuum circuit breaker is provided, comprising:

[0006] Adjust the position of the moving contact so that it contacts and closes with the static contact;

[0007] Adjust the pressure in the vacuum detachable arc extinguishing chamber to the set pressure value;

[0008] Apply a force F1 to the conductive rod and the moving contact away from the static contact, so that the moving contact and the static contact reach the set opening distance L1;

[0009] Obtain the weight G of the moving contact and the conductive rod;

[0010] According to the formula Fz=F1+G, the self-closing force of the vacuum detachable arc extinguishing chamber is calculated when the opening distance L1 is set;

[0011] The moving contact and the stationary contact are both arranged inside the vacuum detachable arc extinguishing chamber, the conductive rod is passed through the vacuum detachable arc extinguishing chamber and connected to the side of the moving contact away from the stationary contact.

[0012] In one of the embodiments, the adjusting the position of the moving contact includes: adjusting the position of the conductive rod by a height adjustment assembly;

[0013] The height adjustment component is located on a side of the conductive rod away from the moving contact and can contact the conductive rod.

[0014] In one embodiment, the step of applying a force F1 to the conductive rod and the movable contact away from the static contact comprises:

[0015] A force measuring assembly is arranged on the conductive rod;

[0016] A weight assembly is set on the force measuring assembly.

[0017] In one embodiment, the step of making the movable contact and the stationary contact reach a set opening distance L1 includes:

[0018] The height adjustment component is brought into contact with the weight component while the position of the conductive rod remains unchanged;

[0019] Lower the height of the height adjustment component to the set opening distance L1;

[0020] The weight of the weight assembly is increased so that the weight assembly contacts the height adjustment assembly when the position of the conductive rod is variable.

[0021] In one embodiment, the vacuum circuit breaker self-closing force testing method further includes:

[0022] The weight G1 of the force measuring assembly and the weight G2 of the weight assembly are added to obtain a force F1 applied to the conductive rod and the moving contact away from the static contact;

[0023] Wherein, G2 is the weight of the weight component when it contacts the height adjustment component when the position of the conductive rod is variable.

[0024] In one embodiment, obtaining the weight G of the moving contact and the conductive rod includes:

[0025] Weighing to obtain the weight G3 of the moving contact;

[0026] The mass M of the conductive rod is calculated according to the shape of the conductive rod, and the weight G4 of the conductive rod is calculated;

[0027] The weight G3 of the moving contact and the weight G4 of the conductive rod are added together to obtain the common weight G of the moving contact and the conductive rod.

[0028] According to another aspect of the present application, a vacuum circuit breaker self-closing force testing device is provided, comprising:

[0029] A weight assembly, comprising a plurality of weights of different weights;

[0030] A force measuring assembly, comprising a first connecting portion and a second connecting portion which are arranged in opposite directions, wherein the first connecting portion is used to be connected to a conductive rod of a vacuum circuit breaker, and the second connecting portion is used to be detachably connected to at least one of the weights;

[0031] The height adjustment assembly comprises an adjustment member and a support member, wherein the support member is arranged on the adjustment member and can support at least one of the heavy objects, and the adjustment member is configured to adjust the distance between the support member and the vacuum detachable arc extinguishing chamber.

[0032] In one embodiment, the force measuring component has a display for displaying force values.

[0033] In one of the embodiments, the vacuum circuit breaker self-closing force testing device further comprises a supporting assembly, wherein the supporting assembly is used to support the vacuum detachable arc extinguishing chamber of the vacuum circuit breaker, and the supporting assembly is provided with a through opening for the conductive rod of the vacuum circuit breaker to pass through.

[0034] In one of the embodiments, the support assembly includes a support frame and a support seat, the support seat is arranged on the support frame, and the vacuum detachable arc-extinguishing chamber is arranged on the support seat.

[0035] The above-mentioned vacuum circuit breaker self-closing force testing method and device directly apply a force away from the static contact to the moving contact so that the moving contact and the static contact reach a set opening distance, and calculate the self-closing force of the vacuum detachable arc extinguishing chamber at the set opening distance according to the weight of the moving contact and the conductive rod, so that the vacuum circuit breaker can effectively detect the self-closing force of the vacuum detachable arc extinguishing chamber at different opening distances without opening the vacuum detachable arc extinguishing chamber. In addition, when the self-closing force of the vacuum detachable arc extinguishing chamber at a variety of opening distances is detected, the present application only needs to perform a vacuum pumping operation once, thereby effectively improving the convenience of operation and saving operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic structural diagram of a vacuum circuit breaker self-closing force testing device according to some embodiments of the present application.

[0037] Figure 2 A schematic flow chart of a method for testing the self-closing force of a vacuum circuit breaker according to some embodiments of the present application.

[0038] Reference numerals:

[0039] 1. Vacuum circuit breaker; 11. Vacuum detachable arc extinguishing chamber; 12. Moving contact; 14. Conductive rod;

[0040] 2. Heavy component;

[0041] 3. Force measuring component;

[0042] 4. Height adjustment component; 41. Adjustment member; 42. Support member;

[0043] 5. Support assembly; 51. Support frame; 52. Support seat. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0050] Vacuum circuit breakers are widely used in power systems to control the opening and closing of circuits in high voltage and high current environments. After the vacuum circuit breaker is opened, its contacts have a self-closing force that automatically attempts to close. The existence of the self-closing force is an important factor in ensuring that the vacuum circuit breaker can quickly and reliably restore the closed state after disconnecting the circuit. The size of the self-closing force can be affected by the size of the opening distance.

[0051] The detachable vacuum arc chamber is a key equipment for studying the characteristics of vacuum arcs. It can repeatedly replace contacts and directly observe vacuum arcs, and is widely used in the field of vacuum arcs. With the increase of the voltage level of vacuum circuit breakers, the volume of contacts has gradually increased, which in turn leads to an increase in the volume of key components such as the conductive rods of the detachable arc chamber. The area of ​​the bellows, as an important sealing component of the detachable vacuum arc chamber, has also increased accordingly. When the area of ​​the bellows increases, the self-closing force of the contacts formed by the pressure difference also increases significantly. The existence of the self-closing force is an important factor in ensuring that the vacuum circuit breaker can quickly and reliably restore the closed state after disconnecting the circuit. It is very important to have matching self-closing forces for vacuum circuit breakers with different voltage levels. Therefore, accurately measuring the self-closing force at different opening distances is of great significance for the design of the operating mechanism.

[0052] However, the prior art lacks an effective detection method and device for the self-closing force of a large-volume detachable vacuum arc-extinguishing chamber at different opening distances, which makes it difficult to make vacuum circuit breakers of different voltage levels have matching self-closing forces.

[0053] Therefore, the present application provides a method and device for testing the self-closing force of a vacuum circuit breaker, which can effectively detect the self-closing force of a large-volume vacuum detachable arc extinguishing chamber at different opening distances, so as to ensure that vacuum circuit breakers of different voltage levels can have matching self-closing forces.

[0054] See also Figure 1 , an embodiment of the present application provides a self-closing force testing device for a vacuum circuit breaker 1, including a weight assembly 2, a force measuring assembly 3 and a height adjustment assembly 4. The vacuum circuit breaker 1 includes a vacuum detachable arc extinguishing chamber 11, a moving contact 12, a static contact, a conductive rod 14 and a bellows. The moving contact 12 and the static contact are both located in the vacuum detachable arc extinguishing chamber 11. The conductive rod 14 is passed through the vacuum detachable arc extinguishing chamber 11 and connected to the moving contact 12. The conductive rod 14 can drive the moving contact 12 to move to adjust the distance between the moving contact 12 and the static contact. The bellows is arranged between the conductive rod 14 and the vacuum detachable arc extinguishing chamber 11 to ensure the sealing effect between the conductive rod 14 and the vacuum detachable arc extinguishing chamber 11.

[0055] For specific settings, see Figure 1 , the weight assembly 2 includes a plurality of weights of different weights. By connecting the conductive rod 14 with weights of different weights, the weight assembly 2 can apply a force to the moving contact 12 away from the static contact, so that the moving contact 12 reaches a set opening distance from the static contact. It can be understood that in one embodiment, the weight assembly 2 includes a plurality of large-mass metal blocks of different weights, and the plurality of metal blocks can be connected to each other. In another embodiment, the weight assembly 2 includes a container and a plurality of large-mass metal blocks of different weights, and the plurality of metal blocks can be selectively placed in the container.

[0056] The force measuring assembly 3 has a first connection portion and a second connection portion which are arranged in opposite directions, the first connection portion is used to connect to the conductive rod 14 of the vacuum circuit breaker 1, and the second connection portion is used to be detachably connected to at least one heavy object. So that the force measuring assembly 3 can detect the weight of the heavy object while assisting heavy objects of different weights to connect to the conductive rod 14. Specifically, the force measuring assembly 3 has a display for displaying the force value, so as to directly display the measured weight of the heavy object. It can be understood that in an embodiment of the present application, the force measuring assembly 3 is a detection device such as a spring dynamometer that can directly display the force value. The force measuring assembly 3 is provided with a fixing member such as a hook or a fixing clamp, so as to be movably connected to the conductive rod 14 and the weight assembly 2 in a manner such as hooking or clamping.

[0057] The height adjustment assembly 4 has an adjusting member 41 and a supporting member 42. The supporting member 42 is disposed on the adjusting member 41 and can support at least one heavy object. The adjusting member 41 is configured to adjust the distance between the supporting member 42 and the vacuum dismountable arc chamber 11, thereby adjusting the opening distance between the moving contact 12 and the static contact. Specifically, when in use, the height adjustment assembly 4 can be placed below the heavy object assembly 2 to support the heavy object assembly 2, and then by adjusting the distance between the supporting member 42 and the vacuum dismountable arc chamber 11, the distance between the supporting member 42 and the vacuum dismountable arc chamber 11 is set to the set opening distance required to be achieved between the moving contact 12 and the static contact, so as to adjust the opening distance between the moving contact 12 and the static contact to the set value.

[0058] It can be understood that in the embodiments of the present application, the adjusting member 41 is a device with adjustable length such as an electric cylinder or a telescopic motor, and the supporting member 42 is a support plate for facilitating the support of the heavy object assembly 2.

[0059] In summary, when the vacuum circuit breaker 1 self-closing force test device of the present application is in use, the height adjustment assembly 4 can be first placed below the conductive rod 14 and the height of the supporting member 42 is adjusted to make the moving contact 12 on the conductive rod 14 contact and close with the static contact driven by the supporting member 42 (this process can also be manually completed). Then the height adjustment assembly 4 is removed and the force measuring assembly 3 is arranged on the conductive rod 14, and the heavy object assembly 2 is arranged on the force measuring assembly 3. After setting, the height adjustment assembly 4 is placed below the heavy object assembly 2, and the height adjustment assembly 4 is made to contact the heavy object assembly 2 under the condition that the position of the conductive rod 14 remains unchanged (the conductive rod 14 can be fixed with a clamping member or the like to control the position of the conductive rod 14 unchanged). Then the height of the height adjustment assembly 4 is reduced to the set opening distance L1, and then the weight of the heavy object assembly 2 is increased to make the heavy object assembly 2 contact the height adjustment assembly 4 under the condition that the position of the conductive rod 14 is variable, ensuring that the opening distance between the moving contact 12 and the static contact is the set opening distance L1 at this time. Then the weights G of the moving contact 12 and the conductive rod 14 are obtained, and the self-closing force of the vacuum dismountable arc chamber 11 at the set opening distance L1 is calculated according to the formula Fz = F1 + G.

[0060] The above test device can directly apply a force to the moving contact 12 to move it away from the static contact to make the opening distance between the moving contact 12 and the static contact reach the set value, and calculate the self-closing force of the vacuum dismountable arc chamber 11 at the set opening distance according to the weights of the moving contact 12 and the conductive rod 14, so that the vacuum circuit breaker 1 can effectively detect the self-closing force of the vacuum dismountable arc chamber 11 at different opening distances without opening the vacuum dismountable arc chamber 11. Moreover, when the present application detects the self-closing force of the vacuum dismountable arc chamber 11 at multiple opening distances, only one vacuum pumping operation is required, thereby effectively improving the operation convenience and saving the operation time.

[0061] Refer to Figure 1In one embodiment, the self-closing force testing device for vacuum circuit breaker 1 further includes a support assembly 5, which is used to support the vacuum detachable arc extinguishing chamber 11 of the vacuum circuit breaker 1, and the support assembly 5 is provided with a through hole for the conductive rod 14 of the vacuum circuit breaker 1 to pass through. The vacuum detachable arc extinguishing chamber 11 of the vacuum circuit breaker 1 is supported by the support assembly 5, so that the force measuring assembly 3 is arranged on the conductive rod 14, and the height adjustment assembly 4 is arranged below the conductive rod 14.

[0062] Specifically, the support assembly 5 includes a support frame 51 and a support seat 52, wherein the support seat 52 is arranged on the support frame 51, and the vacuum detachable arc extinguishing chamber 11 is arranged on the support seat 52. The support seat 52 can be made of a flexible material so as to enhance the buffering effect of the vacuum detachable arc extinguishing chamber 11 on the support frame 51. More specifically, a plurality of support seats 52 are provided, and the plurality of support seats 52 are all arranged on the support frame 51, and the plurality of support seats 52 are all in contact with the side of the vacuum detachable arc extinguishing chamber 11 facing the support frame 51. The vacuum detachable arc extinguishing chamber 11 is supported by the plurality of support seats 52 in cooperation with each other, thereby improving the stability of the vacuum detachable arc extinguishing chamber 11 on the support assembly 5.

[0063] The embodiment of the present application also provides a method for testing the self-closing force of a vacuum circuit breaker, which is used to test the self-closing force of a vacuum detachable arc extinguishing chamber of a vacuum circuit breaker at different opening distances. The vacuum circuit breaker includes a vacuum detachable arc extinguishing chamber, a moving contact, a stationary contact, a conductive rod and a bellows. The moving contact and the stationary contact are both arranged inside the vacuum detachable arc extinguishing chamber. The conductive rod is passed through the vacuum detachable arc extinguishing chamber and connected to the side of the moving contact away from the stationary contact. The conductive rod can drive the moving contact to move to adjust the distance between the moving contact and the stationary contact. The bellows is arranged between the conductive rod and the vacuum detachable arc extinguishing chamber to ensure the sealing effect between the conductive rod and the vacuum detachable arc extinguishing chamber.

[0064] See also Figure 2 , an embodiment of the present application provides a method for testing the self-closing force of a vacuum circuit breaker, comprising:

[0065] The position of the moving contact is adjusted so that the moving contact and the stationary contact are in contact and closed. Specifically, a force is applied to the moving contact to approach the stationary contact so that the moving contact and the stationary contact are in contact and closed.

[0066] It can be understood that in the embodiments of the present application, the conductive rod can be manually pushed to move in the direction close to the static contact to drive the moving contact to move, so that the moving contact and the static contact are in contact and closed. Specifically, the position of the conductive rod is adjusted by a height adjustment assembly. Among them, the height adjustment assembly is located on the side of the conductive rod away from the moving contact and can contact the conductive rod. More specifically, the height adjustment assembly has an adjustment member and a support member, the support member is arranged on the adjustment member and can support at least one heavy object, and the adjustment member is configured to adjust the distance between the support member and the vacuum detachable arc extinguishing chamber, thereby adjusting the opening distance between the moving contact and the static contact.

[0067] Adjust the pressure in the vacuum detachable arc extinguishing chamber to the set pressure value. Specifically, evacuate the vacuum detachable arc extinguishing chamber so that the self-closing force on the moving contact gradually increases under the action of the internal and external pressure difference, and stop when the pressure in the vacuum detachable arc extinguishing chamber drops to less than 10-3Pa to ensure effective arc cutting.

[0068] A force F1 is applied to the conductive rod and the moving contact away from the static contact, so that the moving contact and the static contact reach the set opening distance L1. Specifically, a force measuring component is first set on the conductive rod, and a weight component is set on the force measuring component. Then, the height adjustment component is brought into contact with the weight component while the position of the conductive rod remains unchanged, and then the height of the height adjustment component is lowered to the set opening distance L1. Then, the weight of the weight component is increased so that the weight component is brought into contact with the height adjustment component while the position of the conductive rod is variable, ensuring that the opening distance between the moving contact and the static contact is the set opening distance L1 at this time.

[0069] It can be understood that the force F1 applied to the conductive rod and the movable contact away from the static contact is the sum of the weight G1 of the force measuring assembly and the weight G2 of the weight assembly, wherein G2 is the weight of the weight assembly when it contacts the height adjustment assembly when the conductive rod position is variable.

[0070] Obtain the weight G of the moving contact and the conductive rod. Specifically, the weight G3 of the moving contact is obtained by weighing. The mass M of the conductive rod is calculated according to the shape of the conductive rod, and the weight G4 of the conductive rod is calculated. The weight G3 of the moving contact is added to the weight G4 of the conductive rod to obtain the common weight G of the moving contact and the conductive rod. It can be understood that since the moving contact has a hollow structure and it can be removed from the conductive rod, the weighing method is selected to determine its weight G3. Since the conductive rod is a regular shape with a known material density and it is not easy to be removed from the vacuum detachable arc extinguishing chamber, the weight G4 of the conductive rod is obtained by calculating according to its shape.

[0071] The self-closing force of the vacuum detachable arc extinguishing chamber at the set opening distance L1 is calculated according to the formula Fz=F1+G. Specifically, the sum of the weight G1 of the force measuring assembly and the weight G2 of the weight assembly is added to the sum of the weight G3 of the moving contact and the weight G4 of the conductive rod to obtain the self-closing force of the vacuum detachable arc extinguishing chamber at the set opening distance L1. More specifically, by adjusting the value of the set opening distance L1, the self-closing force of the vacuum detachable arc extinguishing chamber at different opening distances can be obtained.

[0072] In summary, when the vacuum circuit breaker self-closing force testing method of the present application is applied to the vacuum circuit breaker self-closing force testing device, a force away from the static contact can be directly applied to the moving contact to make the moving contact reach the set opening distance with the static contact, and the self-closing force of the vacuum detachable arc extinguishing chamber at the set opening distance can be calculated according to the weight of the moving contact and the conductive rod, so that the vacuum circuit breaker can effectively detect the self-closing force of the vacuum detachable arc extinguishing chamber at different opening distances without opening the vacuum detachable arc extinguishing chamber. Moreover, when the present application detects the self-closing force of the vacuum detachable arc extinguishing chamber at a variety of opening distances, only one vacuuming operation is required, thereby effectively improving the convenience of operation and saving operation time.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A method for testing the self-closing force of a vacuum circuit breaker, characterized in that: include: Adjust the position of the moving contact so that it contacts and closes with the static contact; Adjust the pressure in the vacuum detachable arc extinguishing chamber to the set pressure value; Apply a force F1 to the conductive rod and the moving contact away from the static contact, so that the moving contact and the static contact reach the set opening distance L1; Obtain the weight G of the moving contact and the conductive rod; According to the formula Fz=F1+G, the self-closing force of the vacuum detachable arc extinguishing chamber at the set opening distance L1 is calculated; The moving contact and the stationary contact are both arranged inside the vacuum detachable arc extinguishing chamber, the conductive rod is passed through the vacuum detachable arc extinguishing chamber and connected to the side of the moving contact away from the stationary contact.

2. The method for testing the self-closing force of a vacuum circuit breaker according to claim 1, characterized in that: The adjusting the position of the moving contact comprises: adjusting the position of the conductive rod by a height adjustment assembly; The height adjustment component is located on a side of the conductive rod away from the moving contact and can contact the conductive rod.

3. The method for testing the self-closing force of a vacuum circuit breaker according to claim 2, characterized in that: The force F1 applied to the conductive rod and the moving contact away from the static contact comprises: A force measuring assembly is arranged on the conductive rod; A weight assembly is set on the force measuring assembly.

4. The method for testing the self-closing force of a vacuum circuit breaker according to claim 3, characterized in that: The method of making the moving contact and the stationary contact reach a set opening distance L1 comprises: The height adjustment component is brought into contact with the weight component while the position of the conductive rod remains unchanged; Lower the height of the height adjustment component to the set opening distance L1; The weight of the weight assembly is increased so that the weight assembly contacts the height adjustment assembly when the position of the conductive rod is variable.

5. The method for testing the self-closing force of a vacuum circuit breaker according to claim 4, characterized in that: The vacuum circuit breaker self-closing force testing method further includes: The weight G1 of the force measuring assembly and the weight G2 of the weight assembly are added to obtain a force F1 applied to the conductive rod and the moving contact away from the static contact; Among them, G2 is the weight of the weight component when it contacts the height adjustment component when the position of the conductive rod is variable.

6. The method for testing the self-closing force of a vacuum circuit breaker according to claim 1, characterized in that: The step of obtaining the weight G of the moving contact and the conductive rod comprises: Weighing to obtain the weight G3 of the moving contact; The mass M of the conductive rod is calculated according to the shape of the conductive rod, and the weight G4 of the conductive rod is calculated; The weight G3 of the moving contact and the weight G4 of the conductive rod are added together to obtain the common weight G of the moving contact and the conductive rod.

7. A vacuum circuit breaker self-closing force testing device, using the vacuum circuit breaker self-closing force testing method according to any one of claims 1 to 6, characterized in that: include: A weight assembly, comprising a plurality of weights of different weights; A force measuring assembly, comprising a first connecting portion and a second connecting portion which are arranged in opposite directions, wherein the first connecting portion is used to be connected to a conductive rod of a vacuum circuit breaker, and the second connecting portion is used to be detachably connected to at least one of the weights; The height adjustment assembly comprises an adjustment member and a support member, wherein the support member is arranged on the adjustment member and can support at least one of the heavy objects, and the adjustment member is configured to adjust the distance between the support member and the vacuum detachable arc extinguishing chamber.

8. The vacuum circuit breaker self-closing force testing device according to claim 7, characterized in that: The force measuring component has a display for displaying the force value.

9. The vacuum circuit breaker self-closing force testing device according to claim 7, characterized in that: The vacuum circuit breaker self-closing force testing device also includes a supporting assembly, which is used to support the vacuum detachable arc extinguishing chamber of the vacuum circuit breaker, and the supporting assembly is provided with a through hole for the conductive rod of the vacuum circuit breaker to pass through.

10. The vacuum circuit breaker self-closing force testing device according to claim 9, characterized in that: The support assembly comprises a support frame and a support seat, wherein the support seat is arranged on the support frame, and the vacuum detachable arc-extinguishing chamber is arranged on the support seat.

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