Gating structure for main transformer high-voltage side switch

Abstract

The utility model provides a gate control structure for a main transformer high voltage side switch, which relates to the field of electric power systems and comprises a circuit breaker shell, a fixed joint, a movable joint, a movable column and a piston, the fixed joint, the movable joint, the movable column and the piston are mounted on the inner side of the circuit breaker shell, the piston is fixedly mounted at the top end of the movable column, and the movable joint is mounted on the inner side of the movable column. The inner side of the circuit breaker shell further comprises an arc striking mechanism, the arc striking mechanism comprises an upper arc striking body and a lower arc striking body which are symmetrically arranged, the upper arc striking body is slidably connected to the outer side of the fixed connector, the lower arc striking body is fixedly installed on the outer side of the movable connector, and the upper arc striking body installed on the fixed connector and the lower arc striking body installed on the movable connector are used for guiding electric arcs. The fixed joint and the movable joint are prevented from being gasified or melted at high temperature by the arc in the process of heating sulfur hexafluoride by the arc, and the connection effect and the service life between the fixed joint and the movable joint are kept.

Description

Technical Field

[0001] This utility model relates to the field of power system technology, specifically to a gate control structure for a high-voltage side switch of a main transformer. Background Technology

[0002] The main transformer, or simply main transformer, is the main step-down transformer used for power transmission and transformation in a unit or substation. It is also the core component of the substation. The transformer is the core equipment of the electric locomotive traction power supply system and a key device to ensure the safe and stable operation of the traction power supply system.

[0003] When disconnecting a power transmission line, a high-voltage circuit breaker must first be used to break the circuit. When the circuit breaker disconnects the circuit, a high-temperature arc is generated between the two joints. In the existing technology, sulfur hexafluoride (SF6) circuit breakers eliminate the arc by heating the SF6 with the high temperature generated by the arc. After heating, the SF6 ionizes into negative ions. These negative ions prevent electrons from moving, thus achieving the effect of arc extinguishing. However, during the heating and ionization process of SF6, the arc will still remain between the two joints for a certain period of time. The high temperature generated by the arc can cause the joints to vaporize, melt, or develop pits. In the long run, this will affect the connection effect and service life between the two joints. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a gate control structure for a high-voltage side switch of a main transformer. By using an upper arc-leading body installed on a fixed connector and a lower arc-leading body installed on a movable connector to guide the electric arc, it prevents the electric arc from vaporizing or melting the fixed connector and the movable connector at high temperature during the process of heating sulfur hexafluoride. This maintains the connection effect and service life between the fixed connector and the movable connector, thus solving the problems mentioned in the background technology.

[0005] Technical solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a gate control structure for a high-voltage side switch of a main transformer, comprising a circuit breaker housing and a fixed connector, a movable connector, a movable column, and a piston installed inside the circuit breaker housing. The piston is fixedly installed at the top of the movable column, and the movable connector is installed inside the movable column. The circuit breaker housing also includes an arc-starting mechanism, which comprises an upper arc-starting body and a lower arc-starting body symmetrically arranged. The upper arc-starting body is slidably connected to the outside of the fixed connector, and the lower arc-starting body is fixedly installed to the outside of the movable connector. During the circuit disconnection process, the movable connector first disconnects from the fixed connector, and then the lower arc-starting body disconnects from the upper arc-starting body.

[0007] Furthermore, the main bodies of both the upper and lower arc-drawing bodies are cylindrical with a diameter smaller than that of the fixed and movable joints, and the upper and lower arc-drawing bodies are made of the same material as the fixed and movable joints.

[0008] Furthermore, a pressure spring is fitted on the outside of the fixed joint, and the bottom of the pressure spring abuts against the upper arc body.

[0009] Furthermore, the pressure of the pressure spring on the upper arc-drawing body is greater than the frictional force of the piston sliding on the sleeve.

[0010] Furthermore, a sleeve that cooperates with and seals against the piston is fixedly connected to the outer side of the upper arc body.

[0011] Furthermore, sulfur hexafluoride gas is added to the cavity inside the circuit breaker housing between the piston and the moving joint.

[0012] The beneficial effects of this utility model are as follows:

[0013] By setting an upper arc-initiating body on the fixed joint and a lower arc-initiating body on the movable joint, the electric arc will be generated between the upper and lower arc-initiating bodies after the movable joint moves out from under the fixed joint. This avoids the electric arc being generated between the movable joint and the fixed joint, thus preventing the electric arc from vaporizing or melting the fixed joint and the movable joint at high temperature during the original process of heating sulfur hexafluoride. This maintains the connection effect and service life between the fixed joint and the movable joint. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the connection structure between the upper and lower arc bodies of this utility model.

[0016] Figure 3 The structure of this utility model Figure 1 A magnified view of a portion of area A in the middle.

[0017] The components are: 1. Circuit breaker housing; 2. Fixed joint; 3. Moving joint; 4. Moving column; 5. Piston; 6. Upper arc-leading body; 7. Lower arc-leading body; 8. Pressure spring; 9. Sleeve. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] See Figures 1-3A gate control structure for a high-voltage side switch of a main transformer includes a circuit breaker housing 1 and a fixed connector 2, a movable connector 3, a movable column 4, and a piston 5 installed inside the circuit breaker housing 1. The piston 5 is fixedly installed on the top of the movable column 4, and the movable connector 3 is installed inside the movable column 4. The circuit breaker housing 1 also includes an arc-starting mechanism, which includes an upper arc-starting body 6 and a lower arc-starting body 7 symmetrically arranged. The upper arc-starting body 6 is slidably connected to the outside of the fixed connector 2, and the lower arc-starting body 7 is fixedly installed to the outside of the movable connector 3. During the circuit disconnection process, the movable connector 3 first disconnects from the fixed connector 2, and then the lower arc-starting body 7 disconnects from the upper arc-starting body 6.

[0020] In this solution, the arc is guided by the upper arc-leading body 6 installed on the fixed connector 2 and the lower arc-leading body 7 installed on the movable connector 3, thus preventing the arc from being generated between the fixed connector 2 and the movable connector 3. This prevents the arc from vaporizing or melting the fixed connector 2 and the movable connector 3 at high temperature during the process of heating sulfur hexafluoride, and maintains the connection effect and service life between the fixed connector 2 and the movable connector 3. It should be noted that both the fixed connector 2 and the movable connector 3 are cylindrical made of copper. The movable connector 3 is hollow inside. When the movable connector 3 moves upward and fits onto the outside of the fixed connector 2, the fixed connector 2 and the movable connector 3 are connected to each other.

[0021] The main bodies of the upper arc-drawing body 6 and the lower arc-drawing body 7 are both cylindrical with a diameter smaller than that of the fixed joint 2 and the movable joint 3, and the upper arc-drawing body 6, the lower arc-drawing body 7, the fixed joint 2, and the movable joint 3 are made of the same material.

[0022] In this embodiment, the arc-drawing bodies of the upper arc-drawing body 6 and the lower arc-drawing body 7 are cylindrical with a smaller diameter. The smaller diameter arc-drawing body can preferentially attract and generate an electric arc, thereby better guiding the electric arc and preventing the electric arc from being generated between the fixed joint 2 and the movable joint 3.

[0023] A pressure spring 8 is fitted on the outside of the fixed joint 2, and the bottom of the pressure spring 8 abuts against the upper arc body 6.

[0024] In this embodiment, the pressure spring 8 continuously pushes the upper arc-drawing body 6 to press against the lower arc-drawing body 7 during the downward movement of the movable joint 3. This allows the upper arc-drawing body 6 and the lower arc-drawing body 7 to connect within a certain distance after the movable joint 3 is disconnected from the fixed joint 2. This facilitates the generation of an electric arc between the upper arc-drawing body 6 and the lower arc-drawing body 7. It should be noted that when the movable joint 3 and the fixed joint 2 are disconnected, the lower surface height of the arc-drawing body of the upper arc-drawing body 6 is lower than the lower surface height of the fixed joint 2, and the height of the arc-drawing body of the lower arc-drawing body 7 is higher than the upper surface height of the movable joint 3. This is to prevent the distance between the fixed joint 2 and the movable joint 3 from being less than the distance between the upper arc-drawing body 6 and the lower arc-drawing body 7, which would cause the electric arc to transfer between the fixed joint 2 and the movable joint 3.

[0025] A sleeve 9 that cooperates with and seals with the piston 5 is fixedly connected to the outer side of the upper arc body 6.

[0026] In this embodiment: after the piston 5 is connected to the outside of the sleeve 9, the piston 5 can seal the cavity between the piston 5 and the movable joint 3, thereby facilitating the sealing of the injected sulfur hexafluoride gas. When the piston 5 is removed from the outside of the sleeve 9, the sulfur hexafluoride gas can fill the space between the fixed joint 2 and the movable joint 3, thereby extinguishing the arc by heating the sulfur hexafluoride gas with an electric arc.

[0027] The pressure of the pressure spring 8 on the upper arc body 6 is greater than the frictional force of the piston 5 sliding on the sleeve 9.

[0028] In this embodiment, the pressure of the pressure spring 8 pressing the upper arc body 6 is greater than the sliding friction of the piston 5 on the sleeve 9. This can keep the position of the upper arc body 6 stable when the movable joint 3 moves to the fixed joint 2, and prevent the piston 5 from pushing the upper arc body 6 upward when the movable joint 3 moves to the fixed joint 2, which would cause the upper arc body 6 to be unable to contact the lower arc body 7. This maintains the stability of the upper arc body 6 when the movable joint 3 resets to the fixed joint 2.

[0029] Sulfur hexafluoride gas is added to the cavity inside the circuit breaker housing 1 between the piston 5 and the moving joint 3.

[0030] In this embodiment, sulfur hexafluoride gas can be ionized into negative ions under the high temperature heating of the electric arc. The generated negative ions can prevent electrons from moving, thereby extinguishing the arc and preventing the fixed connector 2 and the movable connector 3 from being unable to disconnect effectively due to the presence of the electric arc.

[0031] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A gate control structure for a high-voltage side switch of a main transformer, comprising a circuit breaker housing (1) and a fixed connector (2), a movable connector (3), a movable column (4), and a piston (5) installed inside the circuit breaker housing (1), wherein the piston (5) is fixedly installed at the top of the movable column (4), and the movable connector (3) is installed inside the movable column (4), characterized in that: The circuit breaker housing (1) also includes an arc-starting mechanism inside. The arc-starting mechanism includes an upper arc-starting body (6) and a lower arc-starting body (7) arranged symmetrically. The upper arc-starting body (6) is slidably connected to the outside of the fixed connector (2), and the lower arc-starting body (7) is fixedly installed on the outside of the movable connector (3). During the circuit disconnection process, the movable connector (3) first disconnects from the fixed connector (2), and then the lower arc-starting body (7) and the upper arc-starting body (6) disconnect.

2. The gate control structure for a high-voltage side switch of a main transformer according to claim 1, characterized in that: The main bodies of the upper arc-drawing body (6) and the lower arc-drawing body (7) are both cylindrical with a diameter smaller than that of the fixed joint (2) and the movable joint (3), and the upper arc-drawing body (6), the lower arc-drawing body (7), the fixed joint (2), and the movable joint (3) are made of the same material.

3. The gate control structure for a high-voltage side switch of a main transformer according to claim 2, characterized in that: A pressure spring (8) is fitted on the outside of the fixed joint (2), and the bottom of the pressure spring (8) abuts against the upper arc body (6).

4. The gate control structure for a high-voltage side switch of a main transformer according to claim 1, characterized in that: The outer side of the upper arc body (6) is fixedly connected to a sleeve (9) that cooperates with and seals with the piston (5).

5. A gate control structure for a high-voltage side switch of a main transformer according to claim 4, characterized in that: The pressure of the pressure spring (8) on the upper arc body (6) is greater than the frictional force of the piston (5) sliding on the sleeve (9).

6. The gate control structure for a high-voltage side switch of a main transformer according to claim 1, characterized in that: Sulfur hexafluoride gas is added to the cavity between the piston (5) and the moving joint (3) inside the circuit breaker housing (1).

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