A switch device with arc extinguishing function for high voltage and large current

Abstract

The utility model discloses a kind of switch devices with arc extinguishing function can be used for high voltage and large current, including shell and arc extinguishing system;Arc extinguishing system adopts composite arc extinguishing technology, including gas blow arc extinguishing unit, magnetic control arc extinguishing unit and solid dielectric arc extinguishing unit.Arc extinguishing system combines gas blow, magnetic control and solid dielectric arc extinguishing technology, through high pressure gas, composite magnetic field and ceramic arc extinguishing groove synergistic effect, arc is quickly extinguished, contact is protected.Monitoring module real-time monitoring operating state, triggers protection action when abnormal.The device compact structure, arc extinguishing efficiency is high, applicable to high voltage large current environment, prolong service life, improve power system security.

Description

Technical Field

[0001] This utility model relates to the field of switching device technology, specifically to a switching device with arc extinguishing function that can be used for high voltage and high current. Background Technology

[0002] In high-voltage power systems and high-current operating scenarios, switchgear is a critical component ensuring the safe and stable operation of the power system. During opening operations, existing switchgear generates a high-temperature arc upon contact separation. This arc can cause contact erosion, significantly shortening contact lifespan and potentially leading to serious faults such as phase-to-phase short circuits, threatening the safety of the power system. Common arc-extinguishing methods, such as gas-generating arc extinguishing and magnetic blowout arc extinguishing, exhibit low arc-extinguishing efficiency and long arc-extinguishing times under high-voltage and high-current environments. Gas-generating arc extinguishing relies on solid gas-generating materials, whose properties are prone to degradation under the high temperatures of high-current arcs, resulting in insufficient arc-extinguishing stability. Magnetic blowout arc extinguishing elongates the arc through a magnetic field, but in high-energy arc scenarios, a single magnetic field is insufficient to quickly extinguish the arc. Utility Model Content

[0003] The purpose of this invention is to provide a switching device that can efficiently extinguish arcs, protect contacts, has a compact structure, and possesses good sealing performance, so as to meet the stable operation requirements under high voltage and high current environments.

[0004] To achieve the above objectives, the present invention proposes the following technical solution: a switching device with arc extinguishing function that can be used for high voltage and high current, comprising a housing (1) and an arc extinguishing system; The arc extinguishing system adopts a composite arc extinguishing technology, including an air-blowing arc extinguishing unit (2), a magnetically controlled arc extinguishing unit (3), and a solid medium arc extinguishing unit (4).

[0005] Preferably, the gas-blown arc extinguishing unit (2) includes a gas storage tank, a nozzle, and a control valve. The gas storage tank stores high-pressure gas, and the control valve controls the high-pressure gas to be ejected through the nozzle to cool and lengthen the electric arc.

[0006] Preferably, the high-pressure gas in the gas storage tank is compressed air or sulfur hexafluoride gas; Preferably, the housing (1) is made of a high-strength insulating material.

[0007] Preferably, the magnetically controlled arc extinguishing unit (3) includes a permanent magnet and an electromagnetic coil, which are arranged around the contact system to generate a composite magnetic field to drive the arc to rotate and stretch.

[0008] Preferably, the solid medium arc extinguishing unit (4) includes an insulating ceramic sheet disposed on the inner wall of the arc extinguishing chamber, and the surface of the insulating ceramic sheet is provided with a spiral arc extinguishing groove for dividing the electric arc to form a short arc effect.

[0009] Preferably, the monitoring module includes a current sensor, a voltage sensor, and a contact wear detection sensor. The sensors are connected to the control module to monitor the operating status of the switching device in real time and control the switch to trip in case of abnormality.

[0010] Beneficial effects: The technical solution of this application has the following technical effects: This invention provides a switching device with arc-extinguishing function that can be used in high-voltage and high-current applications. By employing a composite arc-extinguishing technology, the arc-extinguishing efficiency is significantly improved and the arc-extinguishing time is shortened. The arc-extinguishing system combines a gas-blown arc-extinguishing unit (2), a magnetically controlled arc-extinguishing unit (3), and a solid dielectric arc-extinguishing unit (4). Through rapid cooling and arc lengthening by high-pressure gas, arc rotation and stretching driven by a composite magnetic field, and the arc-splitting effect formed by insulating ceramic sheets, the synergistic effect effectively reduces the arc erosion of the contacts, protects the contact surface, extends its service life, and reduces the probability of faults such as phase-to-phase short circuits. The application of this composite arc-extinguishing technology enables the switching device to achieve rapid and stable arc extinguishing under high-voltage and high-current environments.

[0011] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0012] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0013] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structural principle of this utility model.

[0014] Figure 2 This is a schematic diagram of the structure of this utility model.

[0015] The meanings of the reference numerals in the figure are as follows: 1. Shell; 2. Air-blown arc extinguishing unit; 3. Magnetically controlled arc extinguishing unit; 4. Solid medium arc extinguishing unit. Detailed Implementation

[0016] To better understand the technical content of this utility model, specific embodiments are described below in conjunction with the accompanying drawings. Various aspects of this utility model are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments of this disclosure are not necessarily defined to include all aspects of this utility model. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in this utility model are not limited to any particular implementation. Furthermore, some aspects of this utility model can be used alone or in any suitable combination with other aspects disclosed in this utility model.

[0017] The embodiment provides a switching device with arc-extinguishing function that can be used for high voltage and high current. Its structure includes a housing 1, an arc-extinguishing system, and a monitoring module, as detailed below: The housing 1 is made of high-strength insulating material through injection molding or compression molding processes, such as epoxy resin or reinforced ceramic composite material, which has good mechanical strength and insulation properties. Its main purpose is to provide protection for the live parts inside the device, prevent electrical breakdown under high voltage conditions, and isolate the device from the external environment to ensure its reliability under harsh conditions.

[0018] The arc extinguishing system is the core of this device, and it adopts composite arc extinguishing technology, including air-blown arc extinguishing unit 2, magnetic arc extinguishing unit 3, and solid medium arc extinguishing unit 4. The gas-blown arc-extinguishing unit 2 includes a gas storage tank, a nozzle, and a control valve. The gas storage tank, containing sulfur hexafluoride gas, is installed inside the housing 1 and connected to the nozzle via a pipe. The nozzle is aimed at the contact system separation area, and the control valve controls the gas injection via an electrical signal. Its purpose is to rapidly eject high-pressure gas to cool and lengthen the arc when an arc is generated during contact separation, reducing the arc temperature and energy. Its advantages include rapid arc extinguishing and high stability. The magnetically controlled arc-extinguishing unit 3 includes a permanent magnet and an electromagnetic coil, arranged in the arc-extinguishing chamber surrounding the contact system to form a composite magnetic field. The permanent magnet provides a constant magnetic field, while the electromagnetic coil generates a variable magnetic field controlled by an external power source. The two work together to cause the arc to rotate and stretch at high speed under the Lorentz force. The purpose is to accelerate the cooling and extinction of the arc, and its advantage is that it can effectively cope with high-energy arcs in high-voltage and high-current scenarios. The solid dielectric arc extinguishing unit 4 includes an insulating ceramic sheet disposed on the inner wall of the arc extinguishing chamber, with spiral arc extinguishing grooves machined on the surface of the ceramic sheet. The purpose is to divide the arc into multiple short arcs by the arc extinguishing grooves, and to accelerate the arc extinguishing by utilizing the short arc effect. The advantages are high temperature resistance and arc erosion resistance, further improving the arc extinguishing efficiency.

[0019] Each unit is connected by a fixed bracket and piping system inside the housing 1. The control valve of the air-blown arc extinguishing unit 2 and the electromagnetic coil of the magnetic arc extinguishing unit 3 are connected to the monitoring module through signal lines to ensure accurate triggering of the arc extinguishing action.

[0020] The monitoring module includes a current sensor, a voltage sensor, a contact wear detection sensor, and a control module. The current and voltage sensors are installed near the contact system to monitor current and voltage parameters in the circuit; the contact wear detection sensor is located on the surface of the moving contact to detect the degree of contact wear. All sensors are connected to the control module via signal lines. The control module, which uses an embedded microprocessor, is installed inside the housing. Its purpose is to monitor the device's operating status in real time, promptly detect anomalies such as overcurrent, overvoltage, or excessive contact wear, and trigger the operating mechanism to trip or activate the arc-extinguishing system via control signals. The advantages include improved device safety and reliability, reduced probability of failure, and extended overall service life. (The text also mentions the connections and signal transmission between components.)

[0021] This embodiment achieves efficient arc extinguishing, contact protection, and stable operation of the device through the precise design and coordinated operation of each component. It is suitable for high-voltage and high-current environments, has a compact structure, is easy to maintain, and significantly improves the safety and reliability of the power system.

[0022] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail in this application.

[0023] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A switching device with arc-extinguishing function that can be used for high voltage and high current, characterized in that, Includes the housing (1) and the arc-extinguishing system; The arc extinguishing system adopts a composite arc extinguishing technology, including an air-blowing arc extinguishing unit (2), a magnetically controlled arc extinguishing unit (3), and a solid medium arc extinguishing unit (4).

2. The switching device according to claim 1, characterized in that, The gas-blown arc extinguishing unit (2) includes a gas storage tank, a nozzle, and a control valve. The gas storage tank stores high-pressure gas, and the control valve controls the high-pressure gas to be ejected through the nozzle to cool and lengthen the electric arc.

3. The switching device according to claim 2, characterized in that, The high-pressure gas in the gas storage tank is compressed air or sulfur hexafluoride gas.

4. The switching device according to claim 1, characterized in that, The housing (1) is made of high-strength insulating material.

5. The switching device according to claim 1, characterized in that, The magnetically controlled arc extinguishing unit (3) includes a permanent magnet and an electromagnetic coil, which are arranged around the contact system to generate a composite magnetic field to drive the arc to rotate and stretch.

6. The switching device according to claim 1, characterized in that, The solid medium arc extinguishing unit (4) includes an insulating ceramic sheet disposed on the inner wall of the arc extinguishing chamber. The surface of the insulating ceramic sheet is provided with a spiral arc extinguishing groove for dividing the electric arc to form a short arc effect.

7. The switching device according to claim 1, characterized in that, The switching device also includes a monitoring module, which includes a current sensor, a voltage sensor, and a contact wear detection sensor. The sensors are connected to the control module and are used to monitor the operating status of the switching device in real time and control the switch to trip in case of abnormality.

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