Arc test device and arc test method

Abstract

The invention discloses an arc test device and an arc test method. The arc test device comprises a test prototype, an air blowing mechanism and an air supply system, the test prototype is provided with a closed cavity, a static contact and a moving contact are arranged in the closed cavity, and the moving contact can move in the direction close to or away from the static contact; the gas blowing mechanism comprises a nozzle and a gas guide pipe, the nozzle is located in the closed cavity, the static contact is located in the nozzle, an annular gas channel is formed between the static contact and the side wall of the nozzle, and the gas guide pipe is movably and directly or indirectly communicated with a gas channel of the static contact to provide insulating gas for the static contact and / or the annular gas channel; the air supply system comprises an air pump, air storage equipment and air collecting equipment, the air storage equipment is connected with the air guide pipe through an air inlet pipeline, the air pump is located on the air inlet pipeline, the air collecting equipment communicates with the closed cavity through an air outlet pipeline, and the air outlet pipeline is connected between the air pump and the air storage equipment through a connecting pipeline. According to the invention, the structure of the arc test device is simplified, and the stability of the air blowing effect is improved.

Description

Technical Field

[0001] This application relates to the field of electric arc testing technology, and more specifically, to an electric arc testing apparatus and an electric arc testing method. Background Technology

[0002] An arc test device manufactured to study the breaking performance of insulating gas typically consists of an arc-initiating contact, a nozzle, and a gas-compressing component installed inside a pressure vessel. The gas-compressing component includes a gas cylinder and a piston. The operating mechanism drives the gas cylinder or piston to compress gas through a transmission rod, and blows the gas through the nozzle onto the arc burning between the contacts. The arc is then observed or its parameters are measured through an observation window or sensor.

[0003] To avoid complex designs in the operating mechanism and transmission system on the compressor side, and to improve the flexibility of air blowing adjustment, traditional testing devices typically use gas cylinders or tanks to directly supply gas instead of compressor components. Alternatively, they use an external gas storage device to fill the transition chamber of the tank through pipelines, and then flow to the arc-blowing point. The air intake is controlled by a valve / solenoid valve on the intake pipeline. However, traditional gas storage devices rely on pressure differentials to fill the cylinders of the testing device. To ensure sufficient air blowing for the arc during combustion, the gas storage device must maintain a high pressure exceeding the rated pressure of the testing device's tank. Once the pressure differential decreases, the air blowing effect weakens, affecting the test results. If multiple rounds of testing are conducted, the gas storage device must be replenished in a timely manner to maintain the pressure, resulting in a large gas consumption.

[0004] In addition, in order to maintain the overall gas pressure stability of the test device tank, a gas pressure monitoring module is required to continuously monitor gas pressure changes during the test and activate the gas recovery device in a timely manner. At the same time, the gas filling pipeline and the gas collection pipeline are independent of each other. During the test, it is necessary to control the gas filling operation of the gas storage device and the gas collection operation of the gas recovery device in real time, which increases the complexity of the test control.

[0005] Therefore, how to improve the stability of the air blowing effect while simplifying the structure of the electric arc testing device has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide an electric arc testing device that simplifies the structure of the electric arc testing device while improving the stability of the air blowing effect.

[0007] Another objective of this application is to provide an arc testing method using the above-described arc testing apparatus.

[0008] To achieve the above objectives, this application provides the following technical solution:

[0009] An arc testing apparatus for studying the arc extinguishing effect of insulating gas blowing, comprising:

[0010] The prototype has a closed cavity, and a stationary contact and a moving contact are disposed in the closed cavity. The moving contact is movably disposed in the closed cavity and is used to electrically connect with the stationary contact.

[0011] An air blowing mechanism is provided, comprising a nozzle and an air guide tube. The nozzle is located within the enclosed cavity, and the stationary contact is located within the nozzle. An annular air passage is formed between the stationary contact and the sidewall of the nozzle. The air guide tube is movably connected directly or indirectly to the gas passage of the stationary contact, so that the air guide tube can provide insulating gas to the stationary contact and / or the annular air passage.

[0012] A gas supply system includes a gas pump, a gas storage device, and a gas collection device. The gas storage device is connected to the gas guide pipe via an inlet pipe. The gas pump is located on the inlet pipe, and a first inlet valve and a second inlet valve are respectively installed at the upstream and downstream ends of the gas pump. The gas collection device is connected to the closed cavity via an outlet pipe, and an outlet valve is installed on the outlet pipe. The outlet pipe is connected between the gas pump and the gas storage device via a connecting pipe, and a return valve is installed on the connecting pipe.

[0013] Optionally, in the above-mentioned arc testing device, the test prototype includes a housing, a first insulating platform and a second insulating platform, the first insulating platform and the second insulating platform being located at both ends of the housing, so that the housing, the first insulating platform and the second insulating platform surround and form the closed cavity.

[0014] Optionally, the above-mentioned arc testing device includes a hollow conductor, which is fixedly installed on the first insulating platform, and the stationary contact is connected to the hollow conductor through a contact mounting seat. The air duct is movably inserted into the hollow conductor, and the moving contact is movably connected to the second insulating platform.

[0015] Optionally, in the above-mentioned arc testing device, the contact mounting base is provided with a plurality of air guide holes at intervals along the circumferential direction, and each of the air guide holes is connected to the annular air channel.

[0016] Optionally, the above-mentioned arc testing device further includes a movable driving component, which is used to drive the air guide tube to move within the hollow conductor so that each of the air guide holes can switch between a closed state and an open state.

[0017] Optionally, in the above-described arc testing apparatus, the movable driving component is a moving driving component, which drives the air guide tube to move towards or away from the stationary contact, so that the sidewall of the air guide tube can close or open each of the air guide holes; or,

[0018] The side wall of the air guide tube is provided with an air delivery hole for communicating with the air guide hole. The movable driving member is a rotation driving member, which is used to drive the air guide tube to rotate so that the air delivery hole communicates with the air guide hole.

[0019] Optionally, in the above-mentioned arc testing device, a pressure display device is provided on the housing.

[0020] Optionally, in the above-mentioned arc testing device, the housing is provided with at least one observation window, and the nozzle is provided with an observation hole adapted to the observation window.

[0021] Optionally, in the above-mentioned arc testing device, a flow meter is also provided on the air inlet pipe, and the flow meter is located between the air pump and the air guide pipe.

[0022] An arc testing method, employing the arc testing apparatus as described in any of the preceding claims, includes the following steps:

[0023] The test prototype is inflated by inserting the moving contact into the stationary contact and opening the first and second air inlet valves, so that the gas storage device fills the test prototype with insulating gas to a preset pressure value through the air guide pipe and the annular air passage;

[0024] When the prototype is powered on, a current path is formed between the moving contact and the stationary contact;

[0025] Gas circulation: the first inlet valve is closed and the return valve is opened to allow the insulating gas to circulate between the inlet pipe, the test prototype, the outlet pipe and the connecting pipe until the insulating gas flow in the test prototype is uniform.

[0026] Separate the moving and stationary contacts, so as to form an electric arc between the moving and stationary contacts in the nozzle, and spray the insulating gas toward the electric arc;

[0027] The arc test observes the parameters of the arc plasma by changing the operating parameters, including the arc blowing path of the insulating gas and / or the flow rate of the insulating gas.

[0028] To recover the gas, open the outlet valve and recover the insulating gas through the gas recovery device.

[0029] The arc testing device provided in this application achieves electrical connection or separation between the moving contact and the stationary contact by moving the moving contact, which is located in the closed cavity of the test prototype, toward the direction of approaching or moving away from the stationary contact. When the moving contact and the stationary contact are separated, an arc can be generated in the nozzle. At this time, insulating gas can be supplied by the stationary contact and / or the annular air channel through the movable air guide tube to extinguish the arc. The arc blowing path in the nozzle area can be changed in real time during the arc test without opening the test prototype to replace parts, which is convenient for the study of arc test. Furthermore, the gas supply system's storage device fills the test prototype with insulating gas, eliminating the need for gas flow maintenance and arc blowing, thus saving on insulating gas consumption. During the arc test, the return gas valve can be opened, and the air pump forces the insulating gas to circulate between the inlet pipe, the test prototype, the outlet pipe, and the connecting pipes, ensuring stable gas volume and base pressure within the test prototype. This simplifies the control system, as separate control of the inlet and outlet pipes is unnecessary; only the air pump needs to be controlled, improving the stability of the blowing effect. Additionally, the arc-blowing path in the nozzle area can be changed in real-time during the arc test without opening the test prototype to replace parts, facilitating arc test research.

[0030] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the arc testing device provided in the embodiments of this application;

[0033] Figure 2 A partial schematic diagram of the arc testing apparatus provided in the embodiments of this application. Figure 1 ;

[0034] Figure 3 A partial schematic diagram of the arc testing apparatus provided in the embodiments of this application. Figure 2 ;

[0035] Figure 4A partial schematic diagram of the arc testing apparatus provided in the embodiments of this application. Figure 3 ;

[0036] Figure 5 This is a schematic flowchart of the arc testing method provided in the embodiments of this application.

[0037] Among them, 100 is the electric arc testing device, 10 is the test prototype, 11 is the closed cavity, 12 is the stationary contact, 121 is the contact mounting base, 1211 is the air guide hole, 13 is the moving contact, 14 is the shell, 141 is the air pressure display device, 142 is the observation window, 15 is the first insulating platform, 16 is the second insulating platform, 20 is the air blowing mechanism, 21 is the nozzle, 211 is the observation hole, 212 is the throat, 22 is the air guide pipe, 23 is the annular air channel, 30 is the air supply system, 31 is the air pump, 32 is the air storage device, 321 is the air inlet pipe, 3211 is the first air inlet valve, 3212 is the second air inlet valve, 33 is the air collection device, 331 is the air outlet pipe, 3311 is the air outlet valve, 34 is the connecting pipe, 341 is the return air valve, 40 is the hollow conductor, 50 is the movable driving component, and 200 is the electric arc. Detailed Implementation

[0038] The core of this application is to provide an electric arc testing device that simplifies the structure of the electric arc testing device while improving the stability of the air blowing effect.

[0039] Another key aspect of this application is to provide an arc testing method using the aforementioned arc testing apparatus.

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] like Figure 1As shown in the figure, this application discloses an arc testing device 100 for studying the arc extinguishing effect of insulating gas blowing. It includes a test prototype 10, a blowing mechanism 20, and a gas supply system 30. The gas storage device 32 of the gas supply system 30 is only used to fill the test prototype 10 with insulating gas, and is not needed for maintaining gas flow or blowing the arc, thus saving the amount of insulating gas used. During the arc test, the return gas valve 341 can be opened, and the air pump 31 forces the insulating gas to circulate between the inlet pipe 321, the test prototype 10, the outlet pipe 331, and the connecting pipe 34, thereby ensuring the stability of the gas volume and basic gas pressure within the test prototype 10. There is no need to control the inlet pipe 321 and the outlet pipe 331 separately; only the air pump 31 needs to be controlled, simplifying the control system and improving the stability of the blowing effect. Furthermore, without opening the test prototype 10 to replace parts, the arc blowing path in the nozzle 21 area can be changed in real time during the arc test, which facilitates the study of the arc test. This simplifies the structure of the arc test device 100 while improving the stability of the air blowing effect.

[0042] The following will combine Figures 1 to 4 The electric arc testing apparatus 100 disclosed in the embodiments of this application will be explained and described in detail.

[0043] Among them, such as Figure 1 As shown, the prototype 10 may have a closed cavity 11, and a stationary contact 12 and a moving contact 13 are provided in the closed cavity 11. The moving contact 13 can move toward or away from the stationary contact 12 to realize the electrical connection or separation between the stationary contact 12 and the moving contact 13.

[0044] In some embodiments, as Figure 1 As shown, the test prototype 10 can be composed of a housing 14, a first insulating platform 15, and a second insulating platform 16, with the first insulating platform 15 and the second insulating platform 16 located at opposite ends of the housing 14, so that the housing 14, the first insulating platform 15, and the second insulating platform 16 together form a closed cavity 11. Meanwhile, to achieve electrical connection between the stationary contact 12 and the moving contact 13, the arc testing device 100 can include a hollow conductor 40, which can be fixed at the central axis position of the first insulating platform 15. The stationary contact 12 can be threadedly connected to the hollow conductor 40 via a contact mounting base 121, and the moving contact 13 can be movably connected to the second insulating platform 16, allowing current to be conducted between the hollow conductor 40, the contact mounting base 121, the stationary contact 12, and the moving contact 13.

[0045] like Figure 1As shown, the air blowing mechanism 20 may include a nozzle 21 and an air guide tube 22. The nozzle 21 may be located within the enclosed cavity 11 and connected to the contact mounting base 121, with the stationary contact 12 located within the nozzle 21. A gap exists between the stationary contact 12 and the sidewall of the nozzle 21, forming an annular air passage 23 between them. The air guide tube 22 is movably connected directly or indirectly to the gas passage of the stationary contact 12, enabling it to provide insulating gas to the stationary contact 12 and / or the annular air passage 23. Specifically, the air guide tube 22 may provide insulating gas to the stationary contact 12, or it may also provide insulating gas to the annular air passage 23. Alternatively, the air guide tube 22 may simultaneously provide insulating gas to both the stationary contact 12 and the annular air passage 23.

[0046] In some embodiments, as Figures 1 to 4 As shown, the gas guide tube 22 is movably inserted within the hollow conductor 40, and the gas guide tube 22 has two different operating states. For ease of understanding, the three different operating states of the gas guide tube 22 can be defined as the first operating state, the second operating state, and the third operating state, respectively. In the first operating state, the insulating gas supplied by the gas guide tube 22 flows into the closed cavity 11 of the test prototype 10 through the annular gas channel 23 to fill the test prototype 10 with insulating gas to a preset pressure value, such as... Figure 2 As shown; in the second operating state, the insulating gas supplied by the gas duct 22 is ejected from the stationary contact 12, as... Figure 3 As shown; in the third working state, part of the insulating gas supplied by the gas duct 22 can be ejected from the stationary contact 12, while part of the insulating gas flows into the annular gas channel 23, thereby achieving the effect of the insulating gas blowing arcs through the internal and external paths, as shown. Figure 4 As shown.

[0047] In some embodiments, as Figures 1 to 4 As shown, the contact mounting base 121 is provided with multiple air guide holes 1211 spaced apart along the circumferential direction. That is, two, three, four, or more air guide holes 1211 can be used, and each air guide hole 1211 is connected to the annular air channel 23. The air guide holes 1211 can be inclined from one side of the contact mounting base 121 towards one side of the annular air channel 23, so that the insulating gas flowing into the annular air channel 23 through the air guide holes 1211 in the air guide tube 22 has a large initial velocity, thereby achieving the effect of combined arc blowing of the insulating gas via internal and external paths. Figure 4 As shown.

[0048] To enable the air duct 22 to switch between three different operating states, such as Figure 1As shown, the arc testing device may also include a movable drive element 50. The movable drive element 50 can drive the air guide tube 22 to move within the hollow conductor 40, so that each air guide hole 1211 can switch between a closed state and an open state. This allows for real-time changes in the arc blowing path of the nozzle 21 area during the test without opening the test prototype 10, facilitating research.

[0049] In some embodiments, as Figure 1 As shown, the movable drive component 50 can be a moving drive component, which can drive the air guide tube 22 to move along the hollow conductor 40 towards or away from the stationary contact 12, so that the sidewall of the air guide tube 22 can close or open each air guide hole 1211. That is, when the air guide tube 22 moves along the hollow conductor 40 towards the stationary contact 12 until the air guide tube 22 is in contact with the stationary contact 12, the sidewall of the air guide tube 22 completely covers each air guide hole 1211, thereby closing each air guide hole 1211, so that insulating gas can be ejected from the air guide tube 22 through the stationary contact 12. Figure 3 As shown; when the air guide tube 22 moves along the hollow conductor 40 in a direction away from the stationary contact 12 until the air guide tube 22 disengages from the stationary contact 12, at this time the sidewall of the air guide tube 22 can completely avoid each air guide hole 1211, so that each air guide hole 1211 can be opened, thereby allowing the insulating gas to flow from the air guide tube 22 through each air guide hole 1211 into the annular air passage 23, such as Figure 2 As shown, either a portion of the insulating gas is ejected from the gas guide pipe 22 through the stationary contact 12, or a portion of the insulating gas flows from the gas guide pipe 22 through each gas guide hole 1211 into the annular gas channel 23, thereby achieving the effect of the insulating gas blowing arcs through a combination of internal and external paths, as shown. Figure 4 As shown. It should be noted that the moving drive component can be a stepper motor, a pneumatic cylinder, or a hydraulic cylinder, etc., which is not limited here.

[0050] In some embodiments, the sidewall of the air guide tube 22 may be provided with an air delivery hole communicating with the air guide hole 1211. Simultaneously, the movable drive member 50 may be a rotary drive member, enabling the air guide tube 22 to rotate. This allows the air guide holes 1211 to switch between a closed state and an open state. Specifically, when the rotary drive member rotates the air guide tube 22 until the air delivery hole aligns with the air guide hole 1211, the air guide hole 1211 communicates with the air delivery hole, allowing insulating gas to flow from the air guide tube 22 through the air guide holes 1211 into the annular air passage. 23, or part of the insulating gas is ejected from the gas guide pipe 22 through the stationary contact 12, while part of the insulating gas flows into the annular gas channel 23 through the gas guide pipe 22 through each gas guide hole 1211, thereby achieving the effect of the insulating gas blowing arc through the internal path and the external path; when the rotating drive unit drives the gas guide pipe 22 to rotate until the gas outlet is separated from the gas guide hole 1211, at this time the side wall of the gas guide pipe 22 completely covers each gas guide hole 1211 to seal each gas guide hole 1211, so that the insulating gas can be ejected from the gas guide pipe 22 through the stationary contact 12.

[0051] In some embodiments, as Figure 1 As shown, the housing 14 may be provided with at least one observation window 142, that is, the observation window 142 may be one, two, three or more, and the nozzle 21 is provided with an observation hole 211 adapted to the observation window 142, so that the operator can observe the air blowing test of the electric arc 200 in the nozzle 21 through the observation window 142 and the observation hole 211.

[0052] In some embodiments, as Figure 1 As shown, the nozzle 21 can be composed of a large-diameter section, a small-diameter section, and a connecting section, with the connecting section connecting the large-diameter section and the small-diameter section. The large-diameter section is connected to the contact mounting base 121, and the cavity formed by the nozzle 21 and the contact mounting base 121 expands from the connection point between the small-diameter section and the connecting section towards the moving contact 13, so that the moving contact 13 can move into the nozzle 21 and electrically connect with the stationary contact 12. An observation hole 211 can be disposed through the cavity on the side wall of the throat 212 of the nozzle 21, i.e., at the connection point between the small-diameter section and the connecting section, to observe the air-blowing test of the electric arc 200 within the nozzle 21.

[0053] like Figure 1As shown, the gas supply system 30 may include a gas pump 31, a gas storage device 32, and a gas collection device 33. The gas storage device 32 is connected to the gas guide pipe 22 via an inlet pipe 321, thereby filling the closed cavity 11 of the test prototype 10 with insulating gas. The gas pump 31 is located on the inlet pipe 321, and a first inlet valve 3211 and a second inlet valve 3212 are respectively provided at the upstream and downstream ends of the gas pump 31. The gas collection device 33 is connected to the closed cavity 11 via an outlet pipe 331, which is equipped with an outlet valve 3311. The outlet pipe 331 is connected between the gas pump 31 and the gas storage device 32 via a connecting pipe 34 to form a circulating pipeline for the flow of insulating gas. A return valve 341 may be provided on the connecting pipe 34. During the arc test, the gas storage device 32 can be used to fill the closed cavity 11 of the test prototype 10 with gas to a preset pressure value. Then, the first inlet valve 3211 can be closed. At this time, the pneumatic pump 31 can be used to force the insulating gas to circulate between the inlet pipe 321, the nozzle 21, the closed cavity 11, the outlet pipe 331, and the connecting pipe 34. No filling or discharging operation is required, which ensures that the gas volume in the test prototype 10 remains constant and the basic gas pressure is stable. At the same time, there is no need to control the inlet pipe 321 and the outlet pipe 331 separately; only the pump 31 needs to be controlled, thus simplifying the control system. After the arc test is completed, the outlet valve 3311 can be opened to allow the gas collection device 33 to recover the insulating gas tested. The gas storage device 32 is only used to fill the test prototype 10 and is not used to maintain gas flow or blow gas onto the arc 200. Gas is only consumed during filling, which can save the amount of insulating gas used.

[0054] Of course, the gas storage device 32 can also be directly connected to the gas guide pipe 22. That is, the gas guide pipe 22 can be connected to the air pump 31 through the air inlet pipe 321 via a three-way valve, and at the same time connected to the gas storage device 32, so that the gas storage device 32 fills the closed cavity 11 of the test prototype 10 with insulating gas, and the air pump 31 maintains the circulation of insulating gas in the closed cavity 11.

[0055] In some embodiments, as Figure 1 As shown, a pressure display device 141 can be installed on the housing 14 to display the gas pressure value inside the closed cavity 11 in real time, thereby ensuring the test stability and reliability of the arc testing device 100. Simultaneously, a flow meter or similar device can be installed on the air inlet pipe 321, with the flow meter located between the air pump 31 and the air guide pipe 22, to monitor the flow rate and velocity changes of the insulating gas.

[0056] In some embodiments, the air pump 31 may be, but is not limited to, an adjustable fan, a Roots pump, etc., so that the air intake flow of the test prototype 10 can be adjusted by changing parameters such as the gear, speed and power of the air pump 31.

[0057] The arc testing device 100 disclosed in this application realizes the electrical connection or separation between the moving contact 13 and the stationary contact 12 by moving the moving contact 13 in the closed cavity 11 of the test prototype 10 toward the stationary contact 12 or away from it. When the moving contact 13 is separated from the stationary contact 12, an arc can be generated in the nozzle 21. At this time, insulating gas can be provided by the stationary contact 12 and / or the annular air passage 23 through the movable air guide tube 22 to extinguish the arc. The arc blowing path in the nozzle 21 area can be changed in real time during the arc test without opening the test prototype 10 to replace parts, which is convenient for the study of arc test. Furthermore, the test prototype 10 is filled with insulating gas through the gas storage device 32 of the gas supply system 30, eliminating the need for gas flow maintenance and air blowing for the electric arc 200, thus saving insulating gas consumption. During the arc test, the return gas valve 341 can be opened, and the air pump 31 forces the insulating gas to circulate between the inlet pipe 321, the test prototype 10, the outlet pipe 331, and the connecting pipe 34, ensuring stable gas volume and base pressure within the test prototype 10. This eliminates the need for separate control of the inlet pipe 321 and the outlet pipe 331; only the air pump 31 needs to be controlled, simplifying the control system and improving the stability of the air blowing effect. Moreover, the arc blowing path in the nozzle 21 area can be changed in real time during the arc test without opening the test prototype 10 to replace parts, facilitating the study of the arc test.

[0058] like Figure 5 As shown in the figure, this application also discloses an arc testing method, which uses the arc testing device 100 disclosed in the above embodiment. Therefore, it has all the technical effects of the above-mentioned arc testing device 100, and will not be repeated here. The arc testing method may include steps S100 (gas filling of the test prototype), S200 (energizing the test prototype), S300 (gas circulation), S400 (separation of moving and stationary contacts), S500 (arc testing), and S600 (gas recovery). The following will be combined with... Figures 1 to 5 The electric arc testing method disclosed in the embodiments of this application will be explained and described in detail.

[0059] Step S100: Inflate the test prototype;

[0060] Insert the moving contact 13 into the stationary contact 12, connect the air guide tube 22 to the annular air passage 23, and open the first air inlet valve 3211 and the second air inlet valve 3212 to fill the test prototype 10 with insulating gas to a preset pressure value using the gas storage device 32. The preset pressure value can be set according to the test conditions. It should be noted that, unless otherwise specified, the control valves are initially closed; that is, in this embodiment, both the return air valve 341 and the outlet air valve 3311 are closed.

[0061] Step S200: Power on the test prototype;

[0062] Power is supplied to the test prototype 10 so that a current path is formed between the moving contact 13 and the stationary contact 12.

[0063] Step S300, gas circulation;

[0064] By closing the first inlet valve 3211 and opening the return valve 341, the insulating gas is made to circulate between the inlet pipe 321, the test prototype 10, the outlet pipe 331 and the connecting pipe 34 until the insulating gas flow in the test prototype 10 is uniform. Of course, for insulating gases with multiple components, they can also be mixed uniformly.

[0065] Step S300: Separate the moving and stationary contacts;

[0066] When the test prototype 10 is powered on, the moving contact 13 is separated from the stationary contact 12 to form an electric arc 200 between the moving contact 13 and the stationary contact 12 in the nozzle 21. At the same time, insulating gas is sprayed toward the electric arc 200 so that the parameters of the electric arc plasma can be observed through the test prototype 10.

[0067] Step S400, Arc test;

[0068] The parameters of the electric arc plasma are observed by changing the operating parameters. These operating parameters include the arc-blowing path and / or flow rate of the insulating gas. This can be achieved by moving the gas guide tube 22 via the movable drive component 50, thus enabling arc tests with different arc-blowing paths in the nozzle 21 region; or by controlling the gas pump 31 to change the flow rate of the insulating gas, thus enabling multiple rounds of arc tests under different gas blowing intensities. Alternatively, both the arc-blowing path and the flow rate of the insulating gas in the nozzle 21 region can be changed simultaneously, thus enabling arc tests under the coupled effects of multiple factors related to gas blowing intensity and arc-blowing path. It should be noted that to close the gas guide hole 1211 of the contact mounting base 121, the gas guide tube 22 should be activated when or after the moving contact 13 separates, to avoid affecting the airflow.

[0069] Step S500: Recover the gas;

[0070] After the test is completed, the power to the test prototype 10 is turned off, and the operation of the air pump 31 and the moving drive component 50 is stopped. The outlet valve 3311 is opened, while the second inlet valve 3212 and the return valve 341 remain open. The insulating gas from the test can be recovered through the gas recovery device 33 to avoid residual insulating gas in the circulation pipeline. After recovery is completed, all control valves can be closed. It should be noted that the recovery of insulating gas can be completed by observing the air pressure display device 141 and / or by ensuring that the gas recovery device 33 recovers gas for a specific period of time.

[0071] The terms "first" and "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather not listed.

[0072] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An arc testing apparatus for studying the arc-extinguishing effect of insulating gas blowout, characterized in that, include: The test prototype (10) has a closed cavity (11), and a stationary contact (12) and a moving contact (13) are provided in the closed cavity (11). The moving contact (13) can move toward or away from the stationary contact (12). The blowing mechanism (20) includes a nozzle (21) and a guide pipe (22). The nozzle (21) is located inside the closed cavity (11), and the stationary contact (12) is located inside the nozzle (21). An annular air passage (23) is formed between the stationary contact (12) and the side wall of the nozzle (21). The guide pipe (22) is movably connected directly or indirectly to the gas passage of the stationary contact (12) so that the guide pipe (22) can provide insulating gas to the stationary contact (12) and / or the annular air passage (23). The gas supply system (30) includes a gas pump (31), a gas storage device (32), and a gas collection device (33). The gas storage device (32) is connected to the gas guide pipe (22) through an air inlet pipe (321). The gas pump (31) is located on the air inlet pipe (321). The upstream and downstream ends of the gas pump (31) are respectively provided with a first air inlet valve (3211) and a second air inlet valve (3212). The gas collection device (33) is connected to the closed cavity (11) through an air outlet pipe (331). The air outlet pipe (331) is provided with an air outlet valve (3311). The air outlet pipe (331) is connected between the gas pump (31) and the gas storage device (32) through a connecting pipe (34). The connecting pipe (34) is provided with a return valve (341).

2. The arc testing apparatus according to claim 1, characterized in that, The test prototype (10) includes a housing (14), a first insulating platform (15) and a second insulating platform (16), with the first insulating platform (15) and the second insulating platform (16) located at both ends of the housing (14) respectively, so that the housing (14), the first insulating platform (15) and the second insulating platform (16) surround and form the closed cavity (11).

3. The arc testing apparatus according to claim 2, characterized in that, The device includes a hollow conductor (40), which is fixedly installed on the first insulating platform (15), and the stationary contact (12) is connected to the hollow conductor (40) through a contact mounting base (121). The air duct (22) is movably inserted into the hollow conductor (40), and the moving contact (13) is movably connected to the second insulating platform (16).

4. The arc testing apparatus according to claim 3, characterized in that, The contact mounting base (121) is provided with a plurality of air guide holes (1211) at intervals along the circumferential direction, and each of the air guide holes (1211) is connected to the annular air passage (23).

5. The arc testing apparatus according to claim 4, characterized in that, It also includes a movable drive (50) for driving the air duct (22) to move within the hollow conductor (40) so that each of the air ducts (1211) can switch between a closed state and an open state.

6. The arc testing apparatus according to claim 5, characterized in that, The movable drive component (50) is a moving drive component, which is used to drive the air guide tube (22) to move towards or away from the stationary contact (12), so that the sidewall of the air guide tube (22) can close or open each of the air guide holes (1211); or, The side wall of the air guide tube (22) is provided with an air delivery hole for communicating with the air guide hole (1211). The movable drive member (50) is a rotation drive member. The rotation drive member is used to drive the air guide tube (22) to rotate so that the air delivery hole communicates with the air guide hole (1211).

7. The arc testing apparatus according to claim 2, characterized in that, A pressure display device (141) is provided on the housing (14).

8. The arc testing apparatus according to claim 2, characterized in that, The housing (14) is provided with at least one observation window (142), and the nozzle (21) is provided with an observation hole (211) adapted to the observation window (142).

9. The arc testing apparatus according to any one of claims 1 to 8, characterized in that, A flow meter is also installed on the air inlet pipe (321), and the flow meter is located between the air pump (31) and the air guide pipe (22).

10. An arc testing method, employing the arc testing apparatus (100) as described in any one of claims 1 to 9, characterized in that, Including the following steps: The test prototype is inflated by inserting the moving contact (13) into the stationary contact (12) and opening the first air inlet valve (3211) and the second air inlet valve (3212) so that the gas storage device (32) fills the test prototype (10) with insulating gas to a preset pressure value through the air guide pipe (22) and the annular air passage (23); When the prototype is powered on, a current path is formed between the moving contact (13) and the stationary contact (12); Gas circulation: the first inlet valve (3211) is closed and the return valve (341) is opened so that the insulating gas circulates between the inlet pipe (321), the test prototype (10), the outlet pipe (331) and the connecting pipe (34) until the insulating gas flow in the test prototype (10) is uniform. Separate the moving and stationary contacts, separate the moving contact (13) from the stationary contact (12) to form an electric arc (200) between the moving contact (13) and the stationary contact (12) in the nozzle (21), and spray the insulating gas toward the electric arc (200); The arc test observes the parameters of the arc plasma by changing the operating parameters, including the arc blowing path of the insulating gas and / or the flow rate of the insulating gas. To recover the gas, open the outlet valve (3311) and recover the insulating gas through the gas collection device (33).

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