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CN-224232616-U - Gate control structure for main transformer high-voltage side switch

CN224232616UCN 224232616 UCN224232616 UCN 224232616UCN-224232616-U

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 column and a piston, wherein the fixed joint, the movable column and the piston are arranged on the inner side of the circuit breaker shell, the piston is fixedly arranged on the top end of the movable column, the movable joint is arranged 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 connected with the outer side of the fixed joint in a sliding manner, the lower arc striking body is fixedly arranged on the outer side of the movable joint, and an arc is guided by using the upper arc striking body arranged on the fixed joint and the lower arc striking body arranged on the movable joint, so that the fixed joint and the movable joint are gasified or melted at high temperature in the process of heating sulfur hexafluoride by the arc is prevented, and the connection effect and the service life between the fixed joint and the movable joint are maintained.

Inventors

  • LI XUEKUI
  • WU LIFENG
  • YANG JIACHEN
  • LI XIN
  • HUANG TIANYI

Assignees

  • 深圳大唐宝昌燃气发电有限公司

Dates

Publication Date
20260512
Application Date
20250606

Claims (6)

  1. 1. A gate control structure for a main transformer high-voltage side switch comprises a circuit breaker shell (1) and a fixed joint (2), a movable joint (3), a movable column (4) and a piston (5) which are arranged on the inner side of the circuit breaker shell (1), wherein the piston (5) is fixedly arranged on the top end of the movable column (4), the movable joint (3) is arranged on the inner side of the movable column (4), and the gate control structure is characterized in that the inner side of the circuit breaker shell (1) further comprises an arc striking mechanism, the arc striking mechanism comprises an upper arc striking body (6) and a lower arc striking body (7) which are symmetrically arranged, the upper arc striking body (6) is slidably connected on the outer side of the fixed joint (2), the lower arc striking body (7) is fixedly arranged on the outer side of the movable joint (3), the movable joint (3) is disconnected with the fixed joint (2) firstly, and then the lower arc striking body (7) is disconnected with the upper arc striking body (6) in the circuit breaking connection process.
  2. 2. The gate control structure for the main transformer high-voltage side switch of claim 1, wherein the upper arc striking body (6) and the lower arc striking body (7) are cylindrical, the diameters of which are smaller than those of the fixed joint (2) and the movable joint (3), and the upper arc striking body (6), the lower arc striking body (7) and the fixed joint (2) and the movable joint (3) are the same in material.
  3. 3. The gate control structure for the main transformer high-voltage side switch according to claim 2 is characterized in that a pressure spring (8) is sleeved on the outer side of the fixed joint (2), and the bottom of the pressure spring (8) is abutted against the upper arc striking body (6).
  4. 4. The gate control structure for the main transformer high-voltage side switch is characterized in that a sleeve (9) matched and sealed with a piston (5) is fixedly connected to the outer side of an upper arc striking body (6).
  5. 5. A gate control structure for a main transformer high-voltage side switch according to claim 4, characterized in that the pressure of the pressure spring (8) against the upper striking body (6) is greater than the friction of the piston (5) sliding on the sleeve (9).
  6. 6. A gating structure for a main transformer high-side switch according to claim 1, characterized in that the inside of the breaker housing (1) is filled with sulphur hexafluoride gas in the cavity between the piston (5) and the moving joint (3).

Description

Gate control structure for main transformer high-voltage side switch Technical Field The utility model relates to the technical field of power systems, in particular to a gate control structure for a main transformer high-voltage side switch. Background The main transformer, which is called main transformer for short, is a main step-down transformer for power transmission and transformation in a unit or a transformer substation, is also a core part of the transformer substation, and is a core device of a traction power supply system of an electric locomotive, and is also a key device for ensuring safe and stable operation of the traction power supply system. When the connection of the transmission line is disconnected, a circuit is disconnected by using a high-voltage circuit breaker, a high-temperature arc is generated between two connectors when the circuit breaker is disconnected, the sulfur hexafluoride circuit breaker used in the prior art heats sulfur hexafluoride through the high temperature generated by the arc in the process of eliminating the arc, the sulfur hexafluoride is ionized into negative ions after being heated, the negative ions can cause electrons to be unable to move, so that the arc extinguishing effect is achieved, but the arc still can be connected between the two connectors for a certain time in the process of heating and ionizing the sulfur hexafluoride, the high temperature generated by the arc can cause the connectors to gasify, melt or generate pits, and the connection effect and the service life between the two connectors are influenced in long-term use. Disclosure of utility model Aiming at the defects of the prior art, the utility model provides a gate control structure for a main transformer high-voltage side switch, which prevents the high-temperature gasification of the electric arc or the melting of the fixed joint and the movable joint in the process of heating sulfur hexafluoride by the electric arc by using an upper arc striking body arranged on the fixed joint and a lower arc striking body arranged on the movable joint to guide the electric arc, maintains the connection effect and the service life between the fixed joint and the movable joint, and solves the problems in the background art. Technical proposal The brake control structure for the main transformer high-voltage side switch comprises a circuit breaker shell, a fixed connector, a movable column and a piston, wherein the fixed connector, the movable column and the piston are arranged on the inner side of the circuit breaker shell, the piston is fixedly arranged on the top end of the movable column, the movable connector is arranged on the inner side of the movable column, the inner side of the circuit breaker shell further comprises an arc striking mechanism which comprises an upper arc striking body and a lower arc striking body which are symmetrically arranged, the upper arc striking body is connected on the outer side of the fixed connector in a sliding mode, the lower arc striking body is fixedly arranged on the outer side of the movable connector, and in the circuit breaking connection process, the movable connector is disconnected with the fixed connector first, and then the lower arc striking body and the upper arc striking body are disconnected. Further, the arc striking main bodies of the upper arc striking body and the lower arc striking body are cylindrical, the diameters of which are smaller than those of the fixed joint and the movable joint, and the upper arc striking body, the lower arc striking body, the fixed joint and the movable joint are the same in material. Further, the outside cover of fixed joint is equipped with compression spring, and compression spring bottom is contradicted with the striking body. Further, the pressure of the pressure spring to the upper arc striking body is larger than the friction force of the piston sliding on the sleeve. Further, a sleeve matched and sealed with the piston is fixedly connected to the outer side of the upper striking body. Further, sulfur hexafluoride gas is filled in a cavity between the piston and the movable joint on the inner side of the circuit breaker shell. The utility model has the beneficial effects that: Through setting up the striking body on the fixed joint, set up down the striking body on the mobile joint, shift out the back from the fixed joint below at the mobile joint, electric arc can produce between last striking body and lower striking body to avoid electric arc to produce between mobile joint and fixed joint, and then avoid the in-process electric arc high temperature gasification of original electric arc heating sulfur hexafluoride or melt fixed joint and mobile joint, keep the connection effect and the life between fixed joint and the mobile joint. Drawings FIG. 1 is a cross-sectional view of the structure of the present utility model; FIG. 2 is a schematic diagram of the connection structure of the upper arc striking body