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 invention belongs to the technical field of circuit breakers or disconnectors, and in particular relates to a large-opening frame circuit breaker or disconnector that is beneficial to arc extinguishing. Background Art

[0002] A frame circuit breaker or disconnector is a type of electrical switch that can connect, carry, and disconnect current under normal circuit conditions, as well as connect, carry, and disconnect current for a specified period of 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 increasingly common in DC systems. Traditional frame circuit breakers or disconnectors are primarily used in AC power systems, with fewer being used in DC systems. Unlike AC systems, DC systems lack a natural zero-crossing phenomenon. Unlike AC systems, DC current cannot extinguish the arc at the instant the AC current crosses zero, requiring rapid arc elongation and cooling to exceed the power supply voltage. Extinguishment of the arc requires rapid arc elongation and cooling, which increases the arc voltage to exceed the power supply voltage. The relative position of the moving contacts, stationary contacts, and arc extinguishing chamber can affect the arc extinguishing capability of a frame circuit breaker or disconnector. In existing technology, the arc cannot be effectively elongated due to the small opening distance achieved by the moving contacts upon opening. Furthermore, contact rebound further reduces the opening distance, ultimately leading to switch failure and product burnout. Summary of the Invention

[0003] The purpose of the present invention is to provide a frame circuit breaker or disconnector with a large opening distance that is conducive to arc extinguishing, in order to address the defect that the above-mentioned existing moving contact opening can rotate to a limited opening distance, which results in the arc generated when the moving contact and the static contact are disconnected cannot be effectively elongated, and the rebound of the contacts causes the opening distance to be further reduced, which ultimately leads to the failure of the switch to disconnect and the burning of the product. 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 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 disconnector.

[0004] Technical Solution

[0005] To achieve the above technical objectives, the present invention provides a large-opening frame circuit breaker or disconnector that is conducive to arc extinguishing. The frame circuit breaker or disconnector includes a main shaft, which can drive a moving contact to rotate about 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. The invention is characterized in that the opening distance of the moving contact is 43 to 56 mm, and the ratio of the opening distance to the width of the arc extinguishing chamber is 1:(2.9 to 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 the 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 mechanism main shaft to the moving silver point on the moving contact to the distance from the rotation center of the mechanism main shaft 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 mechanism main shaft to the moving silver point on the moving contact to the distance from the rotation center of the mechanism main shaft 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 embodiment, 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 embodiment, 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 present invention provides a large-opening distance frame circuit breaker or disconnector that facilitates arc extinguishing. The frame circuit breaker or disconnector includes a main shaft that, through a connecting rod mechanism, can drive a moving contact to rotate about its own rotation center. The moving contact's contact and separation with the static contact during rotation controls the on / off switching of the frame circuit breaker or disconnector. The maximum distance between the moving contact and the static contact during the moving contact's rotation is the moving contact's opening distance. The moving contact's opening distance is 43 to 56 mm, and the ratio of the opening distance m to the width of the arc extinguishing chamber is 1:(2.9 to 3.3). By improving the mounting position of the operating mechanism, moving contact, and 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, lengthening the arc and increasing the arc voltage, which facilitates arc extinguishing. Furthermore, the large opening distance effectively prevents insulation breakdown between the contacts caused by contact opening rebound, thereby improving 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 present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Attachment Figure 1 This is a product diagram of a frame circuit breaker or disconnector in an open state according to an embodiment of the present invention.

[0028] Attachment Figure 2 It is attached Figure 1 A-axis sectional view.

[0029] Attachment Figure 3 Schematic diagram of the internal position relationship of a frame circuit breaker or disconnector in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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 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] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0033] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can 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 intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally 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 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 of the relevant 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 has a limited cooling 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 distance frame circuit breaker or disconnector that facilitates arc extinguishing. The frame circuit breaker or disconnector includes a main shaft 1 that drives a moving contact 2 to rotate about its rotation center O1 via a connecting rod mechanism. During rotation, the moving contact 2 makes and separates from the stationary contact 3 to control the on / off switching of the frame circuit breaker or disconnector. The maximum distance between the moving contact 2a and the stationary contact 3a during rotation is the maximum opening distance m of the moving contact 2. The moving contact 2a and the stationary contact 3a, as well as the moving arcing contact 201 and the stationary arcing contact 301, represent the corresponding contact points between the moving contact 2 and the stationary contact 3 when the frame circuit breaker or disconnector is closed. The maximum opening distance of the moving contact 2 is 43 to 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 to 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 linkage mechanism includes a main shaft suspension plate 4, one end of which is fixedly mounted on the mechanism main shaft 1 and the other end is pivotally connected to one end of a connecting rod 5. The other end of the connecting rod 5 is pivotally connected to the moving contact 2. During rotation of the mechanism main shaft 1, the main shaft suspension plate 4 and the connecting rod 5 can drive the moving contact 2 to rotate about its own rotation center O1.

[0037] In order to achieve the maximum opening distance of the moving contact 2 as described above, the Figure 2 and 3 As shown, the internal portion of the frame circuit breaker or disconnector requires positional structural constraints, 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 plate 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 plate 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 movable contact 2 is preferably 1:3.61. The ratio of the working length of the main shaft suspension plate 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 plate 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 open, 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 open, 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 of the moving contact 2. The frame circuit breaker or disconnector operating mechanism with the above-described structural and shape constraints can achieve a certain opening distance for the moving contact to rotate within a limited housing space, thereby allowing the arc generated when the moving and static contacts are disconnected to cool as much as possible.

[0041] This embodiment provides a frame circuit breaker or disconnector with a large opening distance that facilitates arc extinguishing. By improving the operating mechanism, movable contact, and static contact installation positions of the frame circuit breaker or disconnector, the opening distance of the movable contact of the frame circuit breaker or disconnector is increased, lengthening the arc and increasing the arc voltage, which is beneficial for arc extinguishing. At the same time, the large opening distance effectively avoids the occurrence of insulation breakdown between contacts caused by contact opening rebound, thereby improving the breaking performance of the frame circuit breaker or disconnector. It should be noted that this embodiment uses a frame circuit breaker or disconnector as an example for illustration. In fact, any technical solution inspired by this embodiment should be considered to fall within the scope of protection of the present invention.

[0042] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A large-opening-distance 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-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), and is 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to claim 1, characterized in that: The connecting rod mechanism comprises a main shaft suspension piece (4), one end of the main shaft suspension piece (4) 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 main shaft suspension piece (4) and the connecting rod (5) can drive the moving contact (2) to rotate around its own rotation center (O1).

3. A large-spacing frame circuit breaker or disconnector that is advantageous for 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-spacing frame circuit breaker or disconnector that facilitates arc extinguishing according to claim 1, characterized in that: 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).

5. A large-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to claim 4, characterized in that: 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.

48.

6. A large-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that facilitates arc extinguishing according to 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-spacing frame circuit breaker or disconnector that facilitates arc extinguishing according to claim 1, 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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-spacing frame circuit breaker or disconnector that is advantageous for arc extinguishing according to 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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