Large-opening-distance frame circuit breaker or isolating switch beneficial to arc extinguishing

Abstract

A large-opening-distance frame circuit breaker or disconnecting switch beneficial to arc extinguishing comprises a mechanism main shaft, the mechanism main shaft can drive a moving contact to rotate around the rotation center of the moving contact through a connecting rod mechanism, and the moving contact makes contact with and is separated from a static contact in the rotation process to control on-off of the circuit breaker or the disconnecting switch. The maximum distance between the moving silver point on the moving contact and the static silver point on the static contact in the rotating process of the moving contact is the opening distance of the rotating of the moving contact, and the circuit breaker is characterized in that the opening distance of the rotating of the moving contact is 43-56mm, and the ratio of the opening distance to the width of the arc extinguish chamber is 1: (2.9-3.3). By improving the mounting positions of the operating mechanism, the moving contact and the static contact of the circuit breaker or the disconnecting switch, the opening distance of opening rotation of the moving contact of the circuit breaker or the disconnecting switch is increased, the electric arc is lengthened, the electric arc voltage is improved, the extinguishing of the electric arc is facilitated, and meanwhile, the service life of the circuit breaker or the disconnecting switch is prolonged. Due to the large opening distance, the phenomenon of insulation breakdown between the contacts caused by contact opening springback is effectively avoided, and the breaking performance of the circuit breaker or the disconnecting switch is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers or disconnecting switches, and specifically relates to a large-opening frame circuit breaker or disconnecting switch which is beneficial to arc extinguishing. Background Art

[0002] A frame circuit breaker or disconnector is a switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry and disconnect current for a certain time under specified abnormal circuit conditions. With the development of DC power systems such as photovoltaics, energy storage, rail transit, and data centers, switches are becoming more and more widely used in DC systems. Traditional frame circuit breakers or disconnectors are mainly used in AC power systems, and frame circuit breakers or disconnectors used in DC power systems are relatively rare. DC systems do not have a natural zero-crossing phenomenon relative to AC systems. They cannot extinguish the arc at the moment when the AC current crosses zero like AC. They can only rely on rapid elongation and cooling of the arc to make the arc voltage exceed the power supply voltage, and then extinguish the arc. The relative positions of the moving contact, the static contact and the arc extinguishing chamber can affect the arc extinguishing ability of the frame circuit breaker or the arc extinguishing chamber of the disconnector. In the prior art, due to the small opening distance that the moving contact can reach when opening, the arc cannot be effectively elongated, and the contact rebound causes the opening distance to be further reduced, which ultimately leads to the failure of the switch to break and the burning of the product. Utility Model Content

[0003] The purpose of the utility model is to provide a frame circuit breaker or disconnecting switch with a large opening distance that is conducive to arc extinguishing, in view of the defect that the above-mentioned existing moving contact opening can rotate to a limited opening distance, which leads to the arc generated when the moving contact and the static contact are disconnected cannot be effectively elongated, and the contact rebounds to further reduce the opening distance, which ultimately leads to the failure of switch disconnection and the burning of the product. By improving the operating mechanism, moving contact and static contact installation position of the frame circuit breaker or disconnecting switch, the opening distance of the moving contact opening of the frame circuit breaker or disconnecting switch is increased, the arc is elongated, the arc voltage is increased, and it is conducive to the extinguishing of the arc. At the same time, the large opening distance effectively avoids the occurrence of insulation breakdown between contacts caused by the rebound of the contact opening, thereby improving the breaking performance of the frame circuit breaker or disconnecting switch.

[0004] Technical Solution

[0005] In order to achieve the above technical objectives, the utility model provides a large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing, which includes a mechanism main shaft, and the mechanism main shaft can drive a moving contact to rotate around its own rotation center through a connecting rod mechanism. The contact and separation between the moving contact and the static contact during the rotation of the moving contact controls the on and off of the frame circuit breaker or disconnector, and the maximum distance between the moving silver point on the moving contact and the static silver point on the static contact during the rotation of the moving contact is the opening distance of the moving contact rotation, characterized in that: the opening distance of the moving contact rotation is 43-56 mm, and the ratio of the opening distance to the width of the arc extinguishing chamber is 1:(2.9-3.3).

[0006] In one embodiment, the connecting rod mechanism includes a main shaft suspension plate, one end of which is fixedly mounted on the main shaft of the mechanism, and the other end is pivotally connected to one end of a connecting rod, and the other end of the connecting rod is pivotally connected to the moving contact. During the rotation of the main shaft of the mechanism, the moving contact can be driven to rotate around its own rotation center through the main shaft suspension plate and the connecting rod.

[0007] In one embodiment, the ratio of the opening distance to the width of the arc extinguishing chamber is preferably 1:3.1.

[0008] In one embodiment, the ratio of the distance from the rotation center of the main shaft of the mechanism to the moving silver point on the moving contact to the distance from the rotation center of the main shaft of the mechanism to the static silver point on the static contact is 1:(1.34-1.62).

[0009] Furthermore, the ratio of the distance from the rotation center of the main shaft of the mechanism to the moving silver point on the moving contact to the distance from the rotation center of the main shaft of the mechanism to the static silver point on the static contact is preferably 1:1.48.

[0010] In one embodiment, the ratio of the horizontal distance from the rotation center of the mechanism main shaft to the pivot point between the main shaft suspension piece and the connecting rod to the horizontal distance from the rotation center of the mechanism main shaft to the pivot point between the connecting rod and the moving contact is 1:(3.25~3.98).

[0011] Furthermore, the ratio of the horizontal distance from the rotation center of the mechanism main shaft to the pivot point between the main shaft suspension piece and the connecting rod to the horizontal distance from the rotation center of the mechanism main shaft to the pivot point between the connecting rod and the moving contact is preferably 1:3.61.

[0012] In one embodiment, the ratio of the working length of the main shaft suspension piece to the working length of the connecting rod is 1:(0.65-0.81).

[0013] Furthermore, the ratio of the working length of the main shaft suspension piece to the working length of the connecting rod is preferably 1:0.73.

[0014] In one embodiment, the ratio of the distance from the rotation center of the main shaft of the mechanism to the center line of the opening distance to the opening distance is (2.25-2.75):1.

[0015] Furthermore, the ratio of the distance from the rotation center of the main shaft of the mechanism to the center line of the opening distance to the opening distance is preferably 2.5:1.

[0016] In one of the embodiments, the ratio of the distance from the rotation center of the main shaft of the mechanism to the center line of the arc extinguishing chamber to the opening distance is (1.7-2.1):1.

[0017] Furthermore, the ratio of the distance from the rotation center of the main shaft of the mechanism to the center line of the arc extinguishing chamber to the opening distance is preferably 1.9:1.

[0018] In one of the embodiments, the ratio of the distance from the rotation center of the main shaft of the mechanism to the static arc silver point on the static contact to the opening distance is (2.7-3.3):1.

[0019] Furthermore, the ratio of the distance from the rotation center of the main shaft of the mechanism to the static arc silver point on the static contact to the opening distance is preferably 3:1.

[0020] In one embodiment, when the frame circuit breaker or disconnector is opened, the ratio of the distance from the rotation center of the main shaft of the mechanism to the moving arc silver point on the moving contact to the opening distance is (1.70-2):1.

[0021] Furthermore, when the frame circuit breaker or disconnector is opened, the ratio of the distance from the rotation center of the main shaft of the mechanism to the moving arc silver point on the moving contact to the opening distance is preferably 1.88:1.

[0022] In one embodiment, when the frame circuit breaker or disconnector is opened, the ratio of the distance from the static arc silver point on the static contact to the moving arc silver point on the moving contact to the opening distance is (1.13-1.40):1.

[0023] Furthermore, when the frame circuit breaker or disconnector is opened, the ratio of the distance from the static arc silver point on the static contact to the moving arc silver point on the moving contact to the opening distance is preferably 1.26:1.

[0024] Beneficial Effects

[0025] The utility model provides a large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing. It includes a mechanism main shaft, and the mechanism main shaft can drive the moving contact to rotate around its own rotation center through a connecting rod mechanism. The contact and separation between the moving contact and the static contact during the rotation of the moving contact controls the on and off of the frame circuit breaker or disconnector. The maximum distance between the moving silver point on the moving contact and the static silver point on the static contact during the rotation of the moving contact is the opening distance of the moving contact rotation. The opening distance of the moving contact rotation is 43-56 mm, and the ratio of the opening distance m to the width of the arc extinguishing chamber is 1: (2.9-3.3). By improving the operating mechanism, moving contact, and static contact installation position of the frame circuit breaker or disconnector, the opening distance of the moving contact of the frame circuit breaker or disconnector is increased, the arc is lengthened, the arc voltage is increased, and it is conducive to the extinguishing of the arc. At the same time, the large opening distance effectively avoids the occurrence of insulation breakdown between contacts caused by the rebound of the contact opening, and improves the breaking performance of the frame circuit breaker or disconnector. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Attached Figure 1 This is a product diagram of a frame circuit breaker or disconnector in an open state in an embodiment of the utility model.

[0028] Attached Figure 2 Yes Figure 1 Sectional view along A axis.

[0029] Attached Figure 3 It is a schematic diagram of the internal position relationship of the frame circuit breaker or disconnector in the embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a 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. A first feature being “below”, “below” or “below” a 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.

[0034] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0035] Example

[0036] In the prior art, due to the limited opening distance that the moving contact can rotate, the arc generated when the moving contact and the static contact are disconnected can be cooled for a limited time. The arc is not fully cooled before entering the arc extinguishing chamber, and the high-temperature arc particles are easy to burn the shell or the arc extinguishing chamber, thereby reducing the breaking performance of the frame circuit breaker or disconnector. In order to solve this problem, as shown in the attached Figure 1 and 2As shown, this embodiment provides a large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing, which includes a mechanism main shaft 1, and the mechanism main shaft 1 can drive the moving contact 2 to rotate around its own rotation center O1 through a connecting rod mechanism. The contact and separation between the moving contact 2 and the static contact 3 during the rotation process controls the on and off of the frame circuit breaker or disconnector, and the maximum distance between the moving silver point 2a on the moving contact 2 and the static silver point 3a on the static contact 3 during the rotation process of the moving contact 2 is the maximum opening distance m of the moving contact 2. The moving silver point 2a and the static silver point 3a as well as the moving arc silver point 201 and the static arc silver point 301 are the corresponding contact parts of the moving contact 2 and the static contact 3 when the frame circuit breaker or disconnector is closed. Among them, the maximum opening distance of the moving contact 2 is 43-56 mm, and the ratio of the maximum opening distance m to the width K of the arc extinguishing chamber 6 is 1:(2.9-3.3). In this embodiment, the ratio of the maximum opening distance m to the width K of the arc extinguishing chamber 6 is preferably 1:3.1. The connecting rod mechanism includes a main shaft suspension piece 4, one end of which is fixedly mounted on the main shaft 1 of the mechanism, and the other end is pivotally connected to one end of a connecting rod 5, and the other end of the connecting rod 5 is pivotally connected to the moving contact 2. During the rotation of the main shaft 1 of the mechanism, the moving contact 2 can be driven to rotate around its own rotation center O1 through the main shaft suspension piece 4 and the connecting rod 5.

[0037] In order to achieve the maximum opening distance of the moving contact 2 to be 43-56 mm, as shown in the attached Figure 2 and 3 As shown, the internal part of the frame circuit breaker or disconnector needs to be restricted by position structure, wherein the ratio of the distance from the rotation center O2 of the mechanism main shaft 1 to the moving silver point 2a on the moving contact 2 to the distance R from the rotation center O2 of the mechanism main shaft 1 to the static silver point 3a on the static contact 3 is 1:(1.34-1.62). In this embodiment, the ratio of the distance from the rotation center O2 of the mechanism main shaft 1 to the moving silver point 2a on the moving contact 2 to the distance R from the rotation center O2 of the mechanism main shaft 1 to the static silver point 3a on the static contact 3 is preferably 1:1.48. The ratio of the horizontal distance from the rotation center O2 of the mechanism main shaft 1 to the pivot point between the main shaft suspension piece 4 and the connecting rod 5 to the horizontal distance T from the rotation center O2 of the mechanism main shaft 1 to the pivot point between the connecting rod 5 and the moving contact 2 is 1:(3.25-3.98). In this embodiment, the ratio of the horizontal distance from the rotation center O2 of the mechanism main shaft 1 to the pivot point between the main shaft suspension piece 4 and the connecting rod 5 to the horizontal distance T from the rotation center O2 of the mechanism main shaft 1 to the pivot point between the connecting rod 5 and the moving contact 2 is preferably 1:3.61. The ratio of the working length of the main shaft suspension piece 4 to the working length of the connecting rod 5 is 1:(0.65-0.81). In this embodiment, the ratio of the working length of the main shaft suspension piece 4 to the working length of the connecting rod 5 is preferably 1:0.73.

[0038] At the same time, the ratio of the distance N from the rotation center O2 of the mechanism main shaft 1 to the center line of the opening distance m to the opening distance m is (2.25-2.75):1. In this embodiment, the ratio of the distance N from the rotation center O2 of the mechanism main shaft 1 to the center line of the maximum opening distance m to the maximum opening distance m is preferably 2.5:1. The ratio of the distance Q from the rotation center O2 of the mechanism main shaft 1 to the center line of the arc extinguishing chamber 6 to the opening distance m is (1.7-2.1):1. In this embodiment, the ratio of the distance Q from the rotation center O2 of the mechanism main shaft 1 to the center line of the arc extinguishing chamber 6 to the maximum opening distance m is preferably 1.9:1. The ratio of the distance J from the rotation center O2 of the mechanism main shaft 1 to the static arc silver point 301 on the static contact 3 to the opening distance m is (2.7-3.3):1. In this embodiment, the ratio of the distance J from the rotation center O2 of the mechanism main shaft 1 to the static arc silver point 301 on the static contact 3 to the maximum opening distance m is preferably 3:1.

[0039] When the frame circuit breaker or disconnector is opened, the ratio of the distance G from the rotation center O2 of the mechanism main shaft 1 to the moving arc silver point 201 on the moving contact 2 to the opening distance m is (1.70-2):1. In this embodiment, the ratio of the distance G from the rotation center O2 of the mechanism main shaft 1 to the moving arc silver point 201 on the moving contact 2 to the maximum opening distance m is preferably 1.88:1. When the frame circuit breaker or disconnector is opened, the ratio of the distance P from the static arc silver point 301 on the static contact 3 to the moving arc silver point 201 on the moving contact 2 to the opening distance m is (1.13-1.40):1. In this embodiment, the ratio of the distance P from the static arc silver point 301 on the static contact 3 to the moving arc silver point 201 on the moving contact 2 to the maximum opening distance m is 1.26:1.

[0040] The moving silver point 2a and the moving arc silver point 201 are preferably both located on the long contact piece 200 in the moving contact 2. According to the above structure and shape-constrained frame circuit breaker or disconnector operating mechanism, the moving contact can rotate with an opening distance in a limited housing space, so that the arc generated when the moving contact and the static contact are disconnected can be cooled as much as possible.

[0041] This embodiment provides a frame circuit breaker or disconnector with a large opening distance that is conducive to arc extinguishing. By improving the operating mechanism, moving contact, and installation position of the static contact of the frame circuit breaker or disconnector, the opening distance of the moving contact of the frame circuit breaker or disconnector is increased, the arc is lengthened, the arc voltage is increased, and it is conducive to the extinguishing of the arc. At the same time, the large opening distance effectively avoids the occurrence of insulation breakdown between contacts caused by the rebound of the contact opening, and improves the breaking performance of the frame circuit breaker or disconnector. It should be noted that this embodiment uses the frame circuit breaker or disconnector as the object of explanation. In fact, any technical solution inspired by this embodiment should be regarded as falling within the protection scope of the utility model.

[0042] 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.

[0043] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present 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 present application shall be subject to the attached claims.

Claims

1. A large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing, comprising a mechanism main shaft (1), wherein the mechanism main shaft (1) can drive a moving contact (2) to rotate around its own rotation center (O1) through a connecting rod mechanism, wherein the contact and separation between the moving contact (2) and the static contact (3) during the rotation process controls the on and off of the circuit breaker or disconnector, and the maximum distance between the moving silver point (2a) on the moving contact (2) and the static silver point (3a) on the static contact (3) during the rotation process of the moving contact (2) is the opening distance (m) of the moving contact (2), characterized in that: The opening distance of the moving contact (2) during rotation is 43-56 mm, and the ratio of the opening distance (m) to the width (K) of the arc extinguishing chamber (6) is 1:(2.9-3.3).

2. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 1, characterized in that: The connecting rod mechanism comprises a main shaft suspension piece (4), one end of which is fixedly mounted on the main shaft (1) of the mechanism, and the other end of which is pivotally connected to one end of a connecting rod (5), and the other end of which is pivotally connected to the moving contact (2). During the rotation of the main shaft (1) of the mechanism, the moving contact (2) can be driven to rotate around its own rotation center (O1) through the main shaft suspension piece (4) and the connecting rod (5).

3. A large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing according to claim 1, characterized in that: The ratio of the opening distance (m) to the width (K) of the arc extinguishing chamber (6) is 1:3.

1.

4. A large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing according to claim 1, characterized in that: The ratio of the distance from the rotation center (O2) of the main shaft (1) of the mechanism to the moving silver point (2a) on the moving contact (2) to the distance (R) from the rotation center (O2) of the main shaft (1) of the mechanism to the static silver point (3a) on the static contact (3) is 1:(1.34-1.62).

5. A large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing as claimed in claim 4, characterized in that: The ratio of the distance from the rotation center (O2) of the main shaft (1) of the mechanism to the moving silver point (2a) on the moving contact (2) to the distance (R) from the rotation center (O2) of the main shaft (1) of the mechanism to the static silver point (3a) on the static contact (3) is 1:1.

48.

6. A large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing as claimed in claim 1, characterized in that: The ratio of the horizontal distance from the rotation center (O2) of the main shaft (1) of the mechanism to the pivot point between the main shaft suspension piece (4) and the connecting rod (5) to the horizontal distance (T) from the rotation center (O2) of the main shaft (1) of the mechanism to the pivot point between the connecting rod (5) and the moving contact (2) is 1:(3.25-3.98).

7. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 6, characterized in that: The ratio of the horizontal distance from the rotation center (O2) of the main shaft (1) of the mechanism to the pivot point between the main shaft suspension piece (4) and the connecting rod (5) to the horizontal distance (T) from the rotation center (O2) of the main shaft (1) of the mechanism to the pivot point between the connecting rod (5) and the moving contact (2) is 1:3.

61.

8. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 2, characterized in that: The ratio of the working length of the main shaft suspension piece (4) to the working length of the connecting rod (5) is 1:(0.65-0.81).

9. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 8, characterized in that: The ratio of the working length of the main shaft suspension piece (4) to the working length of the connecting rod (5) is 1:0.

73.

10. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 1, characterized in that: The ratio of the distance (N) from the rotation center (O2) of the main shaft (1) of the mechanism to the center line of the opening distance (m) to the opening distance (m) is (2.25-2.75):

1.

11. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 10, characterized in that: The ratio of the distance (N) from the rotation center (O2) of the main shaft (1) of the mechanism to the center line of the opening distance (m) to the opening distance (m) is 2.5:

1.

12. A large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing as claimed in claim 1, characterized in that: The ratio of the distance (Q) from the rotation center (O2) of the main shaft (1) of the mechanism to the center line of the arc extinguishing chamber (6) to the opening distance (m) is (1.7-2.1):

1.

13. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 12, characterized in that: The ratio of the distance (Q) from the rotation center (O2) of the main shaft (1) of the mechanism to the center line of the arc extinguishing chamber (6) to the opening distance (m) is 1.9:

1.

14. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 1, characterized in that: The ratio of the distance (J) from the rotation center (O2) of the main shaft (1) of the mechanism to the static arc silver point (301) on the static contact (3) to the opening distance (m) is (2.7-3.3):

1.

15. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 14, characterized in that: The ratio of the distance (J) from the rotation center (O2) of the main shaft (1) of the mechanism to the static arc silver point (301) on the static contact (3) to the opening distance (m) is 3:

1.

16. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 1, characterized in that: When the frame circuit breaker or disconnector is opened, the ratio of the distance (G) from the rotation center (O2) of the main shaft (1) of the mechanism to the moving arc silver point (201) on the moving contact (2) to the opening distance (m) is (1.70-2):

1.

17. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 16, characterized in that: When the frame circuit breaker or disconnector is opened, the ratio of the distance (G) from the rotation center (O2) of the main shaft (1) of the mechanism to the moving arc silver point (201) on the moving contact (2) to the opening distance (m) is 1.88:

1.

18. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 1, characterized in that: When the frame circuit breaker or disconnector is opened, the ratio of the distance (P) from the static arc silver point (301) on the static contact (3) to the moving arc silver point (201) on the moving contact (2) to the opening distance (m) is (1.13-1.40):

1.

19. A large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing as claimed in claim 18, characterized in that: When the frame circuit breaker or disconnector is opened, the ratio of the distance (P) from the static arc silver point (301) on the static contact (3) to the moving arc silver point (201) on the moving contact (2) to the opening distance (m) is 1.26:1.

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