High-voltage circuit breaker arc extinguish chamber capable of observing arc and installation clamp

Abstract

The utility model relates to the technical field of high-voltage circuit breakers, and discloses a high-voltage circuit breaker arc extinguish chamber capable of observing electric arcs and a matched installation clamp, which comprise a moving arc contact, a static arc contact, a shell, a shell visual window, a nozzle and a nozzle visual window, the movable arc contact is fixedly connected with the nozzle, the static arc contact is fixed on the other side, the movable arc contact can be in contact with or away from the static arc contact, the nozzle visual window is a transparent part and is arranged on the nozzle, arc extinguishing gas is accelerated after flowing through the nozzle, arc extinguishing is helped, and the static arc contact, the movable arc contact and the nozzle are all arranged in the shell. The shell visual window is installed on the shell and used for observing the arc extinguishing condition of the spraying area from the outside of the shell through the nozzle visual window. And the capability of directly observing the arc form in the arc extinguish chamber from the outside is realized, so that the arc can be directly analyzed by utilizing an optical diagnosis technology in the operation process of the high-voltage circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage circuit breaker technology, and in particular to a high-voltage circuit breaker arc-extinguishing chamber and installation fixture with observable electric arc. Background Technology

[0002] High-voltage circuit breakers are a type of high-voltage electrical switch and are one of the important pieces of equipment in substations. Under normal circumstances, circuit breakers are used to interrupt and close no-load current and load current in a circuit. When a system fault occurs, the protection device can interrupt the overload current or short-circuit current in the circuit to ensure the safe operation of the power system. At the same time, circuit breakers can also perform automatic reclosing to improve the reliability of power supply.

[0003] High-voltage circuit breakers are core equipment in the construction and operation of high-voltage projects. The arc-extinguishing chamber, as a core component of the circuit breaker, is of paramount importance in its design. The most commonly used type in power systems is the SF6 circuit breaker, whose arc-extinguishing chambers can be divided into two types: compressed air type and self-powered type. The self-powered arc-extinguishing principle utilizes the energy of the electric arc itself to generate the necessary pressure for blowing the arc and thus breaking the current. The compressed air type uses the mechanical energy provided by the operating mechanism during the opening process to compress the gas in the chamber to extinguish the arc. The arc-extinguishing chamber of a high-voltage SF6 circuit breaker mainly consists of a stationary arc contact, a moving arc contact, a nozzle that moves with the moving arc contact, and its metal connecting components.

[0004] To prevent SF6 gas leakage from the arc-extinguishing chamber and ensure the successful interruption efficiency of the circuit breaker, the arc-extinguishing chamber of traditional high-voltage SF6 circuit breakers is mainly a closed metal cavity. This makes the entire interruption process of most circuit breaker products invisible. Therefore, this design is not conducive to the observation and study of the arc morphology during the actual circuit breaker interruption process. The traditional closed arc-extinguishing chamber makes it difficult to observe the arc morphology during the SF6 circuit breaker interruption process, making it extremely difficult to diagnose the microscopic characteristics of the gas arc plasma in a real circuit breaker using optical diagnostic methods and to measure the temperature and other properties of the gas arc using spectrometry. Utility Model Content

[0005] The purpose of this invention is to enable the observation of the arc morphology during the breaking process, thereby realizing the diagnosis of the microscopic characteristics of the gas arc plasma of a real circuit breaker using optical diagnostic methods and the measurement of properties such as the temperature of the gas arc by spectrometry.

[0006] To achieve the above objectives, this utility model provides a high-voltage circuit breaker arc-extinguishing chamber with observable electric arc, comprising a moving arc contact, a stationary arc contact, a housing, a housing viewing window, a nozzle, and a nozzle viewing window;

[0007] The moving arc contact is fixedly connected to the nozzle, while the stationary arc contact is fixed on the other side. The moving arc contact can contact or move away from the stationary arc contact. The nozzle viewing window is a transparent component and is located on the nozzle. The arc-extinguishing gas is accelerated after flowing through the nozzle, which helps to extinguish the arc. The stationary arc contact, moving arc contact, and nozzle are all located inside the housing. The housing viewing window is installed on the housing and is used to observe the arc extinguishing situation in the spray area from outside the housing through the nozzle viewing window.

[0008] Furthermore, the nozzle includes a fixed section and an acceleration section fixedly connected to the fixed section. The nozzle viewing window is located on the acceleration section. The diameter of the acceleration section gradually decreases from the end near the stationary arc contact to the end away from the stationary arc contact. The fixed section is sleeved on the outer periphery of the moving arc contact near the stationary arc contact.

[0009] Furthermore, the diameter of the acceleration section at the end furthest from the stationary arc contact is smaller than that of the fixed section at the end closest to the stationary arc contact.

[0010] Furthermore, a snap-fit ​​groove is provided on the outer periphery of the fixed section near the static arc contact.

[0011] Furthermore, the outer periphery of the fixed section away from the stationary arc contact is provided with a threaded section, and the fixed section is threadedly connected to the moving arc contact through the threaded section.

[0012] Furthermore, the nozzle viewing window is made of quartz flat glass.

[0013] Furthermore, the housing also includes a compressor chamber and a piston. The piston is fixedly connected to the outer periphery of the moving arc contact. The compressor chamber is connected to the injection zone and is slidably disposed inside the piston. The piston can compress the arc-extinguishing gas inside the compressor chamber.

[0014] Furthermore, the arc-extinguishing chamber of the high-voltage circuit breaker that allows observation of the electric arc also includes a clamping steel plate, and a viewing window of the outer shell is located on the side of the clamping steel plate facing the nozzle viewing window. The clamping steel plate and the viewing window of the outer shell are fixedly connected to the outer shell by multiple bolts.

[0015] An installation clamp for installing an arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc as described above includes a snap fastener, a collar, and a rotating component. The snap fastener is detachably connected to the collar and can engage in a snap fastener groove, and the rotating component is fixedly connected to the outer periphery of the collar.

[0016] Furthermore, there are multiple buckles, which are circumferentially spaced on the collar.

[0017] Compared with the prior art, the arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc according to this embodiment of the invention has the following advantages:

[0018] (1) By setting viewing windows on the outer shell and nozzle respectively, the ability to directly observe the arc morphology inside the arc chamber from the outside is realized. This allows for direct analysis of the arc morphology, plasma characteristics of the gas arc, and changes in arc temperature using optical diagnostic technology during the operation of the high-voltage circuit breaker, providing key experimental data for further optimization of the circuit breaker design and operation.

[0019] (2) The housing viewing window and nozzle viewing window of this application provide an intuitive and accurate technical means for fault diagnosis. By directly observing the arc extinguishing process, the fault point can be quickly located and the arc extinguishing efficiency can be analyzed, which greatly improves the reliability of equipment operation and the efficiency of fault handling. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc according to an embodiment of this utility model;

[0021] Figure 2 This is a cross-sectional view of the nozzle of an embodiment of this utility model;

[0022] Figure 3 This is an installation diagram of the viewing window of the outer shell according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the fixture according to an embodiment of the present utility model.

[0024] In the diagram, 1 is the moving arc contact; 2 is the stationary arc contact.

[0025] 3. Nozzle; 31. Fixing section; 311. Snap-fit ​​groove; 312. Threaded section; 32. Acceleration section; 33. Spray zone;

[0026] 4. Nozzle viewing window;

[0027] 5. Outer shell; 51. Compressor chamber; 52. Piston;

[0028] 6. External viewing window; 7. Clamping steel plate;

[0029] 100. Installation clamp; 101. Buckle; 102. Collar; 103. Rotating component. Detailed Implementation

[0030] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0031] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] like Figures 1-3 As shown, a preferred embodiment of the present invention provides a high-voltage circuit breaker arc-extinguishing chamber with observable arc, comprising a moving arc contact 1, a stationary arc contact 2, a housing 5, a housing viewing window 6, a nozzle 3, and a nozzle viewing window 4.

[0034] The moving arc contact 1 is fixedly connected to the nozzle 3. The nozzle 3 encloses and forms a spray zone 33. The ends of the moving arc contact 1 and the stationary arc contact 2 that are close to each other are located in the spray zone 33. The moving arc contact 1 can contact or move away from the stationary arc contact 2. The nozzle viewing window 4 is a transparent part and is located on the nozzle 3. The nozzle 3 can spray arc-extinguishing gas toward the spray zone 33. The stationary arc contact 2, the moving arc contact 1, and the nozzle 3 are all located inside the housing 5. The housing viewing window 6 is installed on the housing 5. The housing viewing window 6 is used to observe the arc extinguishing situation of the spray zone 33 through the nozzle viewing window 4 from outside the housing 5.

[0035] Based on the above scheme, by setting viewing windows 6 on the outer shell 5 and 4 on the nozzle 3, respectively, the ability to directly observe the arc morphology inside the arc-extinguishing chamber from the outside is achieved. This allows for direct analysis of the arc morphology, plasma characteristics of the gas arc, and changes in arc temperature using optical diagnostic technology during the operation of the high-voltage circuit breaker, providing crucial experimental data for further optimization of the circuit breaker's design and operation. The viewing windows 6 on the outer shell and 4 on the nozzle of this application provide intuitive and accurate technical means for fault diagnosis. By directly observing the arc-extinguishing process, fault points can be quickly located and arc-extinguishing efficiency analyzed, significantly improving equipment operational reliability and fault handling efficiency.

[0036] The working process of this invention is as follows: Under normal circumstances, the moving arc contact 1 and the stationary arc contact 2 are in close contact, and current can flow normally. When it is necessary to disconnect the circuit, the operating mechanism sends a signal, and the moving arc contact 1 begins to separate from the stationary arc contact 2, resulting in an electric arc between the moving arc contact 1 and the stationary arc contact 2. Traditional closed designs cannot observe the shape of the electric arc. In order to observe the changes and characteristics of the electric arc, this design opens a shell viewing window 6 and a nozzle viewing window 4 on both sides of the arc-extinguishing chamber shell 5 and the nozzle 3, so that the shape of the electric arc can be clearly seen through the shell viewing window 6 and the nozzle viewing window 4. Under high temperature and high pressure, the nozzle 3 can spray arc-extinguishing gas toward the spray zone 33 to extinguish the electric arc. Through the transparent shell viewing window 6 and nozzle viewing window 4, researchers can use lasers, cameras, or spectrometers to diagnose the shape, temperature, and other characteristics of the electric arc, helping to optimize the performance and safety of the high-voltage circuit breaker. Once the electric arc is successfully extinguished and does not reignite, the circuit is successfully disconnected. This design allows for simultaneous observation and extinguishing of the electric arc, ensuring both the circuit breaker's efficient arc extinguishing capability and precise diagnosis of the arc's dynamic characteristics. This helps to better understand arc behavior and improve equipment performance.

[0037] Preferably, the nozzle 3 includes a fixed section 31 and an acceleration section 32 fixedly connected to the fixed section 31. The nozzle viewing window 4 is disposed on the acceleration section 32. The diameter of the acceleration section 32 gradually decreases from the end near the stationary arc contact 2 to the end away from the stationary arc contact 2. The fixed section 31 is sleeved on the outer periphery of the moving arc contact 1 near the end of the stationary arc contact 2.

[0038] Based on the above scheme, the diameter of the acceleration section 32 gradually decreases from near the stationary arc contact 2 to far away from the stationary arc contact 2, allowing the arc-extinguishing gas to achieve a higher flow velocity during injection. This not only improves the utilization efficiency of the arc-extinguishing gas but also significantly enhances the arc-extinguishing effect, especially playing a crucial role in improving the arc-extinguishing capability under high current and high voltage conditions.

[0039] More preferably, in this embodiment, the nozzle viewing window 4 and the housing viewing window 6 are coaxially arranged to ensure the smooth application of laser interference and dual-wavelength spectroscopy technology, while avoiding the scattering or obstruction of arc light.

[0040] Preferably, the diameter of the acceleration section 32 at the end furthest from the stationary arc contact 2 is smaller than that of the fixed section 31 at the end closest to the stationary arc contact 2. Through the contraction structure of the acceleration section 32, the flow path of the arc-extinguishing gas is more concentrated, the airflow energy is fully utilized, and gas loss during the arc-extinguishing process is reduced. This design not only reduces the volume of the compression chamber but also improves the breaking efficiency of the circuit breaker.

[0041] Preferably, the outer periphery of the fixed section 31 near the static arc contact 2 is provided with a snap-fit ​​groove 311. The snap-fit ​​groove 311 simplifies the installation process of the nozzle 3. Using the matching clamps, the operator can quickly and accurately complete the assembly or disassembly of the nozzle 3, which not only reduces the assembly time, but also reduces the difficulty of maintaining and replacing the nozzle 3.

[0042] Preferably, the outer periphery of the fixed section 31 away from the stationary arc contact 2 is provided with a threaded section 312, and the fixed section 31 is threadedly connected to the moving arc contact 1 through the threaded section 312. This threaded connection makes the connection between the fixed section 31 and the moving arc contact 1 more stable, effectively avoiding loosening or detachment that may occur with traditional connection methods. The threaded connection facilitates quick disassembly and installation, requiring no special tools and significantly improving the maintenance efficiency of the device.

[0043] Preferably, the nozzle viewing window 4 is made of quartz flat glass. If a nozzle viewing window 4 made of polymethyl methacrylate (PMMA) is used to observe the arc morphology, a single ordinary interruption will cause the nozzle viewing window 4 to quickly burn and blacken, rendering it useless for observation. Using glass, however, achieves a combination of high temperature resistance and light transmittance, ensuring both the nozzle's arc-extinguishing capability and improving the reliability of observation.

[0044] Preferably, the housing 5 further includes a compression chamber 51 and a piston 52. The piston 52 is fixedly connected to the outer periphery of the moving arc contact 1. During arc extinguishing, the compression chamber 51 is connected to the injection zone 33. The compression chamber 51 is slidably disposed within the piston 52. The operating mechanism can compress the arc-extinguishing gas inside the compression chamber 51 via the piston connecting rod. The operating mechanism compresses the arc-extinguishing gas inside the compression chamber 51 via the piston connecting rod, allowing the arc-extinguishing gas to obtain higher pressure during injection. This high-pressure arc-extinguishing gas can more effectively impact the arc, enhancing the speed and reliability of the arc extinguishing process.

[0045] Preferably, the arc-extinguishing chamber of the high-voltage circuit breaker that allows observation of the electric arc also includes a clamping steel plate 7, and a viewing window 6 of the outer shell is located on the side of the clamping steel plate 7 facing the nozzle viewing window 4. The clamping steel plate 7 and the viewing window 6 of the outer shell are fixedly connected to the outer shell 5 by a plurality of bolts.

[0046] Based on the above scheme, the clamping steel plate 7 is fixedly connected to the outer casing 5 by multiple bolts. The outer casing viewing window 6 is embedded inside the clamping steel plate 7, forming a robust multi-layered fixing structure. This effectively prevents the outer casing viewing window 6 from loosening or shifting under high pressure, improving the overall reliability of the arc-extinguishing chamber structure. The clamping steel plate 7 further tightens the contact surface between the outer casing viewing window 6 and the outer casing 5, ensuring the airtightness of the connection area and preventing arc-extinguishing gas leakage. While ensuring the function of the observation window, the high-pressure environment of the arc-extinguishing chamber is maintained, ensuring the operational safety of the circuit breaker.

[0047] like Figure 4 As shown, an installation clamp 100 is used to install the arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc as described above. It includes a snap fastener 101, a collar 102, and a rotating member 103. The snap fastener 101 is detachably connected to the collar 102 and can be engaged in the groove 311 of the snap fastener 101. The rotating member 103 is fixedly connected to the outer periphery of the collar 102.

[0048] Based on the above design, the snap-fit ​​101 can precisely engage with the snap-fit ​​groove 311 of the nozzle 3 fixing section 31, ensuring a tight connection between the nozzle 3 and the clamp and preventing positional shift or loosening during installation. The rotating component 103 provides convenient rotation control. Due to the lever effect, the operator can easily and effortlessly control the angle of the clamp and quickly complete the installation of the nozzle.

[0049] Preferably, there are multiple clips 101, which are circumferentially spaced on the collar 102. The multiple clips 101 are evenly distributed around the collar 102, which makes the fixing force of the clamp on the nozzle 3 more even and avoids deformation or damage of the component caused by excessive force at a single point.

[0050] In summary, this utility model provides a high-voltage circuit breaker arc-extinguishing chamber and mounting fixture 100 for observing electric arcs. By providing viewing windows 6 on the outer shell 5 and 4 on the nozzle 3, respectively, it enables direct observation of the arc morphology within the arc-extinguishing chamber from the outside. This allows for direct analysis of the arc morphology, plasma characteristics of the gas arc, and changes in arc temperature using optical diagnostic technology during high-voltage circuit breaker operation, providing crucial experimental data for further optimization of circuit breaker design and operation. The viewing windows 6 on the outer shell and 4 on the nozzle provide intuitive and accurate technical means for fault diagnosis. By directly observing the arc-extinguishing process, fault points can be quickly located and arc-extinguishing efficiency analyzed, significantly improving equipment operational reliability and fault handling efficiency.

[0051] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A high-voltage circuit breaker arc-extinguishing chamber with observable electric arc, characterized in that, It includes a moving arc contact (1), a stationary arc contact (2), a housing (5), a housing viewing window (6), a nozzle (3), and a nozzle viewing window (4); The moving arc contact (1) is fixedly connected to the nozzle (3), and the nozzle (3) encloses and forms a spray area (33). The moving arc contact (1) and the stationary arc contact (2) are located close to each other in the spray area (33). The moving arc contact (1) can contact or move away from the stationary arc contact (2). The nozzle viewing window is a transparent part and is located on the nozzle (3). The nozzle (3) can spray arc-extinguishing gas toward the arc-extinguishing area (33). The stationary arc contact (2), the moving arc contact (1), and the nozzle (3) are all located inside the housing (5). The housing (5) viewing window is installed on the housing (5). The housing viewing window (6) is used to observe the arc-extinguishing situation of the spray area (33) through the nozzle viewing window (4) from outside the housing (5).

2. The arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc according to claim 1, characterized in that, The nozzle (3) includes a fixed section (31) and an acceleration section (32) fixedly connected to the fixed section (31). The nozzle viewing window (4) is disposed on the acceleration section (32). The diameter of the acceleration section (32) gradually decreases from one end near the stationary arc contact (2) to the other end away from the stationary arc contact (2). The fixed section (31) is sleeved on the outer periphery of the moving arc contact (1) near the stationary arc contact (2).

3. The arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc according to claim 2, characterized in that, The diameter of the acceleration section (32) at the end furthest from the stationary arc contact (2) is smaller than that of the fixed section (31) at the end closest to the stationary arc contact (2).

4. The arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc according to claim 2, characterized in that, The fixed section (31) has a buckle (101) groove (311) on the outer periphery near the static arc contact (2).

5. The arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc according to claim 2, characterized in that, The fixed section (31) has a threaded section (312) on its outer periphery away from the static arc contact (2), and the fixed section (31) is threaded to the moving arc contact (1) through the threaded section (312).

6. The arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc according to claim 1, characterized in that, The nozzle viewing window (4) is made of quartz flat glass.

7. The arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc according to claim 1, characterized in that, The outer casing (5) also includes a pressure chamber (51) and a piston (52). The piston (52) is fixedly connected to the outer periphery of the moving arc contact (1). During arc extinguishing, the pressure chamber (51) is connected to the injection zone (33). The pressure chamber (51) is slidably disposed in the piston (52). The piston (52) can compress the arc extinguishing gas inside the pressure chamber (51).

8. The arc-extinguishing chamber of a high-voltage circuit breaker with observable electric arc according to claim 1, characterized in that, It also includes a clamping steel plate (7), and the outer shell viewing window (6) is located on the side of the clamping steel plate (7) facing the nozzle viewing window (4). The clamping steel plate (7) and the outer shell viewing window (6) are fixedly connected to the outer shell (5) by a plurality of bolts.

9. A mounting clamp for mounting the nozzle (3) of the arc-extinguishing chamber of a high-voltage circuit breaker as described in claim 4, characterized in that, It includes a buckle (101), a collar (102) and a rotating component (103). The buckle (101) is detachably connected to the collar (102) and can be engaged in the groove (311) of the buckle (101). The rotating component (103) is fixedly connected to the outer periphery of the collar (102).

10. The mounting fixture according to claim 9, characterized in that, The number of the buckles (101) is multiple, and the multiple buckles (101) are circumferentially spaced on the collar (102).

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