Static side damping buffer structure of closing resistor and high-voltage circuit breaker

Abstract

The utility model discloses a static side damping buffer structure of a closing resistor and a high-voltage circuit breaker, and belongs to the technical field of circuit breakers. The switch comprises a static contact, a guide rod, a first guide piece, a second guide piece and an elastic reset piece. A static contact and a first guide part are respectively fixed at two ends of the guide rod, the first guide part and a second guide part are connected in a sliding mode and form an air chamber together, the second guide part is arranged to be in a static state, namely the second guide part is kept still all the time, a damping hole is formed in the first guide part, and the air chamber is communicated with the outside through the damping hole. When the first guide piece slides relative to the second guide piece, the air chamber exhausts air to the outside or absorbs air from the outside through the damping hole, and meanwhile the size of the air chamber changes accordingly. According to the utility model, when the moving contact and the static contact are switched on, impact force can be fully absorbed, rebound force is weakened, and reliability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a static-side damping buffer structure of a closing resistor and a high-voltage circuit breaker. Background Art

[0002] In a high-voltage power grid system, when the main contacts of a circuit breaker perform a closing operation, an overvoltage will be generated. For power grid systems above 330 kV, it is generally necessary for the circuit breaker to be equipped with a closing resistor in parallel to limit the closing overvoltage. Its working principle is to use the closing resistor to absorb and convert part of the electrical energy in the power grid into heat energy, so as to weaken the electromagnetic oscillation and limit the overvoltage. Therefore, it is necessary for the closing resistor contact to be connected within 8 - 11 ms before the main contact of the circuit breaker closes, so as to connect the closing resistor in series to the main circuit, thereby converting the overvoltage into the heat energy of the resistor, and then achieving the suppression of the overvoltage generated by the closing of the main contacts.

[0003] The closing resistor includes a moving contact and a static contact. The moving contact is connected with a driving device so as to move under the action of the driving device. During the closing process, the moving contact moves rapidly towards the static contact and contacts it. If the impact force borne by the static contact at the moment of closing cannot be fully absorbed, it will rebound to the moving contact, ultimately affecting the service life of the closing resistor. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that the static-side structure of the closing resistor has a large rebound force at the moment of closing. For this reason, a static-side damping buffer structure of a closing resistor and a high-voltage circuit breaker are provided, which can fully absorb the impact at the moment of closing, reduce the rebound force, and improve the service life of the closing resistor.

[0005] The technical solution of the utility model is as follows:

[0006] A static-side damping buffer structure of a closing resistor includes a static contact, a guide rod, a first guiding member, a second guiding member, and an elastic reset member. The static contact and the first guiding member are respectively fixed at two ends of the guide rod. The first guiding member is slidably connected with the second guiding member and together forms an air chamber. The second guiding member is set to be in a static state. A damping hole is provided on the first guiding member and / or the second guiding member. The air chamber is communicated with the outside through the damping hole. When closing, the air chamber and the elastic reset member are compressed. When opening, the elastic reset member is used to reset the static contact and the guide rod.

[0007] As an optional solution, the first guiding member includes a piston fixed on the guide rod, the second guiding member includes an air cylinder, the periphery of the piston is slidably connected with the inner wall of the air cylinder, and a plurality of the damping holes are provided on the piston.

[0008] As an alternative, the piston includes a sliding plate and a friction ring. The center of the sliding plate is detachably connected to the guide rod. The damping holes are located on the sliding plate and are arranged around the piston rod. An annular groove is provided on the side surface of the sliding plate, and the friction ring is snap-fitted into the annular groove and protrudes from the opening of the annular groove.

[0009] As an alternative, the static-side damping and buffering structure of the closing resistor further includes at least three guide rods. The guide rods are fixedly connected to the air cylinder. The guide rods are evenly arranged around the guide rod. The guide rods penetrate through the piston and are used to guide the sliding movement of the piston.

[0010] As an alternative, the static-side damping and buffering structure of the closing resistor further includes a first support member and a second support member. The first support member and the second support member are set to be in a static state. The first support member is provided with a guide hole for the guide rod to penetrate through. The second support member is detachably connected with the second guide member.

[0011] As an alternative, a number of third guide members are fixed in the guide hole of the first support member. The third guide members are used to guide the guide rod. A spiral elastic reset member is provided on one side of the guide hole. The two ends of the elastic reset member are respectively connected to the first support member and the static contact. The elastic reset member is sleeved on the guide rod. On the other side of the guide hole, a guide rod of the second guide member is fixed. The guide rod penetrates through the first guide member and is used to guide the first guide member.

[0012] As an alternative, the second support member includes a first connecting plate, a second connecting plate and a special-shaped tube. The special-shaped tube is bent at 90°. A hand hole is provided between the two ends of the special-shaped tube. The first connecting plate and the second connecting plate are respectively arranged at the two ends of the special-shaped tube. The first connecting plate is detachably connected with the second guide member.

[0013] As an alternative, an arc shielding cover is provided at the connection between the second support member and the second guide member. The arc shielding cover locally covers the second guide member.

[0014] A high-voltage circuit breaker includes a circuit breaker main body and the static-side damping and buffering structure of the closing resistor according to any one of the above. The static-side damping and buffering structure of the closing resistor is fixed on the circuit breaker main body.

[0015] As an alternative, the static-side damping and buffering structure of the closing resistor and the circuit breaker main body have two connection positions. One connection position is located at one end of the static-side damping and buffering structure of the closing resistor away from the static contact, and the other connection position is located in the middle of the static-side damping and buffering structure of the closing resistor.

[0016] The utility model has at least the following beneficial effects:

[0017] 1. At the moment when the moving contact and the static contact are closed, the first guide moves under the action of the static contact and slides relative to the second guide. The elastic reset member and the air chamber are compressed to store energy, and the guide rod speed is reduced. In other words, the "cylinder" structure formed by the guide rod, the first guide member and the second guide member and the elastic reset member absorb the impact force and weaken the rebound force of the static contact toward the moving contact. When opening, the static contact and the guide rod are reset under the action of the elastic reset member. In this process, the air chamber space increases, and the speed of the static contact reset is reduced, avoiding physical damage to itself caused by sudden reset.

[0018] 2. The static side damping buffer structure and the circuit breaker body have two connection positions, one connection position is located at the end of the static side damping buffer structure of the closing resistor, and is the end away from the static contact, and the other connection position is located in the middle of the static side damping buffer structure of the closing resistor, so that the static side damping buffer structure has two supports, and the first guide member and the second guide member will not swing when closing, thereby enhancing the reliability of the static side damping buffer structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The technical features and advantages of the present invention may be more fully understood by referring to the following detailed description in conjunction with the accompanying drawings.

[0020] Figure 1 It is a cross-sectional schematic diagram of the static side damping buffer structure in the open state in the embodiment of the utility model.

[0021] Figure 2 It is a cross-sectional schematic diagram of the static side damping buffer structure in the closed state in the embodiment of the utility model.

[0022] Figure 3 It is a structural schematic diagram of the piston in the embodiment of the utility model.

[0023] Reference numerals:

[0024] 100, static side damping buffer structure; 200, dynamic side structure;

[0025] 1. Static contact; 2. Guide rod; 3. First guide member; 31. Sliding plate; 32. Friction ring; 33. Damping hole; 34. Through hole; 35. Fixing hole; 4. Second guide member; 41. Air cylinder; 5. Elastic reset member; 6. Guide rod; 7. First support member; 71. Guide hole; 8. Second support member; 81. First connecting plate; 82. Second connecting plate; 83. Special-shaped tube; 84. Hand hole; 9. Third guide member; 10. Arc shield; 11. Air chamber. DETAILED DESCRIPTION

[0026] Unless otherwise defined, the technical terms or scientific terms used in this specification and claims shall have the common meanings understood by persons having ordinary skills in the technical field to which the present invention belongs.

[0027] refer to Figures 1 - 3 Understand. The utility model provides a high-voltage circuit breaker, including a circuit breaker body and a closing resistor, wherein the closing resistor is arranged on the circuit breaker body, and the closing resistor is used to be connected 8 to 11 ms before the moving side main contact and the static side main contact of the circuit breaker body are closed, so as to be connected in series to the main circuit. The closing resistor includes a moving side structure 200 and a static side damping buffer structure 100, wherein the moving side structure 200 and the static side damping buffer structure 100 are respectively arranged on the circuit breaker body, and the moving contact of the moving side structure 200 can move linearly so as to approach or move away from the static contact 1 of the static side damping buffer structure 100, thereby realizing the closing and opening of the closing resistor.

[0028] The static side damping buffer structure 100 and the circuit breaker body have two connection positions, one connection position is located at the end of the static side damping buffer structure 100 of the closing resistor, and is the end away from the static contact 1, and the other connection position is located in the middle of the static side damping buffer structure 100 of the closing resistor, so that the static side damping buffer structure 100 has two supports and can remain more stable when subjected to the impact of the dynamic side structure 200.

[0029] The static side damping buffer structure 100 comprises a static contact 1, a guide rod 2, a first guide member 3, a second guide member 4 and an elastic reset member 5. The static contact 1 and the first guide member 3 are fixed to both ends of the guide rod 2, respectively. The first guide member 3 is slidably connected with the second guide member 4 and forms an air chamber 11 together. The second guide member 4 is set to a static state, that is, the second guide member 4 always remains stationary. A damping hole 33 is provided on the first guide member 3, and the air chamber 11 is connected to the outside through the damping hole 33. When the first guide member 3 slides relative to the second guide member 4, the air chamber 11 discharges gas to the outside through the damping hole 33 or absorbs gas from the outside. At the same time, the size of the air chamber 11 changes accordingly. At the moment when the moving contact and the stationary contact 1 are closed, the first guide 3 moves under the action of the stationary contact 1 and slides relative to the second guide 4. The elastic reset member 5 and the air chamber 11 are compressed and store energy, and the speed of the guide rod 2 is reduced. In other words, the "cylinder" structure formed by the guide rod 2, the first guide member 3 and the second guide member 4 and the elastic reset member 5 absorb the impact force and weaken the rebound force of the stationary contact 1 toward the moving contact. When opening the switch, the stationary contact 1 and the guide rod 2 are reset under the action of the elastic reset member 5. During this process, the space of the air chamber 11 increases, and the speed of the stationary contact 1 resetting is reduced, avoiding physical damage to itself caused by sudden reset.

[0030] In this embodiment, the first guiding member 3 includes a piston fixed to the guide rod 2, and the second guiding member 4 includes a cylinder 41. The open end of the cylinder 41 faces the static contact 1, and the other end is fixed to the relay body. The periphery of the piston is slidably connected to the inner wall of the cylinder 41, and a plurality of damping holes 33 are provided on the piston. In other embodiments, as an alternative means, the first guiding member 3 can be set as the cylinder 41, and the second guiding member 4 can be set as the piston.

[0031] In this embodiment, the piston includes a sliding plate 31 and a friction ring 32. The sliding plate 31 is detachably connected to the guide rod 2 by bolts at the fixing hole 35. The damping holes 33 are located on the sliding plate 31 and are arranged around the piston rod. There are five damping holes 33, and the aperture is set to 5 mm, which ensures the stability of the piston during sliding and can control the speeds of the static contact 1 and the guide rod 2 between 6.4 m / s and 7.6 m / s. An annular groove is provided on the side surface of the sliding plate 31, and the friction ring 32 is snap-fitted into the annular groove and protrudes from the opening of the annular groove. The friction ring 32 has a clearance fit with the inner wall of the cylinder 41. After the friction loss reaches a certain level, it can be directly replaced, which is more cost-effective than replacing the sliding plate 31.

[0032] In this embodiment, the static-side damping and buffering structure 100 of the closing resistor further includes at least three guide rods 6. The guide rods 6 are fixedly connected to the cylinder 41, are evenly arranged around the guide rod 2, penetrate the piston, and are used to guide the sliding movement of the piston. Correspondingly, through holes 34 are provided on the piston to cooperate with the guide rods 6. The three guide rods 6 guide the piston, avoiding the situation where the piston is stuck or the buffering fails due to slight flipping in the cylinder 41, and improving the reliability.

[0033] In this embodiment, the static-side damping and buffering structure 100 of the closing resistor further includes a first support member 7 and a second support member 8. The first support member 7 and the second support member 8 are set to be in a static state, and are respectively fixed on the relay body. The first support member 7 has a guiding hole 71 through which the guide rod 2 penetrates, and the second support member 8 is detachably connected to the second guiding member 4. The static-side damping and buffering structure 100 forms the two connection positions mentioned above with the relay body through the first support member 7 and the second support member 8. The first support member 7 is located in the middle of the static-side damping and buffering structure 100, and the second support member 8 is located at the end of the static-side damping and buffering structure 100. The stability of the static-side damping and buffering structure 100 is improved through these two connections, so that the first guiding member 3 and the second guiding member 4 will not have yaw during closing, and further enhances the reliability of the static-side damping and buffering structure 100.

[0034] In this embodiment, several third guiding members 9 are fixed in the guiding hole 71 of the first supporting member 7. The third guiding members 9 are used to guide the guide rod 2. The third guiding members 9 are in the form of guiding rings, which are stuck in the grooves on the inner wall of the guiding hole 71. The third guiding members 9 are arranged in groups of two, and a total of two groups are provided. The two groups of third guiding members 9 can be respectively arranged at both ends of the guiding hole 71 to further improve the guiding performance. The third guiding members 9 and the guide rod 2 can adopt a clearance fit.

[0035] In this embodiment, the elastic reset member 5 as described above is arranged on one side of the guiding hole 71. The elastic reset member 5 is a spiral spring, and its two ends are respectively connected to the first supporting member 7 and the static contact 1. A positioning and guiding groove coaxial with the elastic reset member 5 is arranged on the first supporting member 7 to position and restrict the elastic reset member 5 from the outside. The elastic reset member 5 is sleeved on the guide rod 2.

[0036] In this embodiment, the guiding rod 6 of the second guiding member 4 as described above is fixed on the other side of the guiding hole 71, that is, both ends of the guiding rod 6 are respectively fixed to the first supporting member 7 and the air cylinder 41.

[0037] In this embodiment, the second supporting member 8 includes a first connecting plate 81, a second connecting plate 82 and a special-shaped pipe 83. The special-shaped pipe 83 is bent by 90°. Here, the "bending" is understood in a broad sense, as long as one opening direction of the special-shaped pipe 83 is perpendicular to the other opening direction. The first connecting plate 81 and the second connecting plate 82 are respectively arranged at both ends of the special-shaped pipe 83, and the first connecting plate 81 is detachably connected to the second guiding member 4. A hand hole 84 is arranged between both ends of the special-shaped pipe 83 to provide space for connecting the first connecting plate 81 and the air cylinder 41, and the second connecting plate 82 and the relay body.

[0038] The second supporting member 8 is electrically connected to the static side main contact of the relay body. When the current passes through the connection position between the air cylinder 41 and the second supporting member 8, tip discharge may occur. Therefore, in the present utility model, an arc shielding cover 10 is arranged at the connection between the second supporting member 8 and the second guiding member 4. The arc shielding cover 10 locally covers the air cylinder 41 of the second guiding member 4 to shield the tip arc and improve safety.

[0039] In addition, terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0040] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A static side damping buffer structure of a closing resistor, characterized in that: The invention comprises a static contact, a guide rod, a first guide member, a second guide member and an elastic reset member, wherein the static contact and the first guide member are fixed at two ends of the guide rod respectively, the first guide member is slidably connected with the second guide member and jointly form an air chamber, the second guide member is set to a static state, a damping hole is provided on the first guide member and / or the second guide member, the air chamber is connected with the outside through the damping hole, the air chamber and the elastic reset member are compressed when the switch is closed, and the elastic reset member is used to reset the static contact and the guide rod when the switch is opened.

2. The static side damping buffer structure of the closing resistor according to claim 1, characterized in that: The first guide member comprises a piston fixed on the guide rod, and the second guide member comprises an air cylinder. The periphery of the piston is slidably connected to the inner wall of the air cylinder, and a plurality of damping holes are arranged on the piston.

3. The static side damping buffer structure of the closing resistor according to claim 2, characterized in that: The piston includes a sliding plate and a friction ring. The center of the sliding plate is detachably connected to the guide rod. The damping hole is located on the sliding plate and arranged around the piston rod. An annular groove is provided on the side of the sliding plate. The friction ring is clamped in the annular groove and protrudes from the opening of the annular groove.

4. The static side damping buffer structure of the closing resistor according to claim 2, characterized in that: The static side damping buffer structure of the closing resistor also includes at least three guide rods, which are fixedly connected to the air cylinder, are evenly arranged around the guide rod, penetrate the piston, and are used to guide the sliding movement of the piston.

5. The static side damping buffer structure of the closing resistor according to claim 1, characterized in that: The static side damping buffer structure of the closing resistor also includes a first support member and a second support member, the first support member and the second support member are set to a static state, the first support member is provided with a guide hole for the guide rod to pass through, and the second support member is detachably connected to the second guide member.

6. The static side damping buffer structure of the closing resistor according to claim 5, characterized in that: A plurality of third guide members are fixed in the guide hole of the first support member, and the third guide members are used to guide the guide rod; a spiral elastic reset member is provided on one side of the guide hole, and the two ends of the elastic reset member are respectively connected to the first support member and the static contact, and the elastic reset member is sleeved on the guide rod; a guide rod of the second guide member is fixed on the other side of the guide hole, and the guide rod passes through the first guide member and is used to guide the first guide member.

7. The static side damping buffer structure of the closing resistor according to claim 5, characterized in that: The second supporting member includes a first connecting plate, a second connecting plate and a special-shaped tube, the special-shaped tube is bent 90°, a hand hole is provided between the two ends of the special-shaped tube, the first connecting plate and the second connecting plate are respectively provided at the two ends of the special-shaped tube, and the first connecting plate is detachably connected to the second guide member.

8. The static side damping buffer structure of the closing resistor according to claim 5, characterized in that: An arc shielding cover is provided at the connection between the second supporting member and the second guiding member, and the arc shielding cover partially covers the second guiding member.

9. A high voltage circuit breaker, characterized in that: It comprises a circuit breaker body and a static side damping buffer structure of a closing resistor as claimed in any one of claims 1 to 8, wherein the static side damping buffer structure of the closing resistor is fixed on the circuit breaker body.

10. The high voltage circuit breaker according to claim 9, characterized in that: The static side damping buffer structure of the closing resistor and the circuit breaker body have two connection positions, one connection position is located at the end of the static side damping buffer structure of the closing resistor away from the static contact, and the other connection position is located in the middle of the static side damping buffer structure of the closing resistor.

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