A method and system for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker

Abstract

The present invention relates to the technical field of power equipment maintenance, and discloses a method and system for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker. In the present invention, the circuit breaker to be tested is connected to a moving and static contact spacing adjusting device, a high-speed camera and a light source device are arranged in the arc extinguishing chamber of the circuit breaker to be tested, the high-speed camera is aligned with the movement area of the moving contact and the static contact in the arc extinguishing chamber, and the high-speed camera is connected to a servo controller and a schlieren imaging device. Furthermore, the contact opening distance is adjusted through the moving and static contact spacing adjusting device, the high-speed camera is triggered to take pictures through the servo controller, so that the schlieren imaging device obtains schlieren images at different contact opening distances, and finally the obtained schlieren images are analyzed to obtain the development characteristics of the gas flow field in the arc extinguishing chamber. Compared with the method of determining the development characteristics of the gas flow field in the arc extinguishing chamber during the opening process of the circuit breaker through simulation, the present invention can better reflect the real change of the gas flow field in the arc extinguishing chamber, thereby improving the accuracy of detecting the development characteristics of the gas flow field.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment maintenance, and particularly to a method and system for detecting the development characteristics of the airflow field in a circuit breaker arc extinguishing chamber. Background Art

[0002] The post-arc re-breakdown phenomenon of high-voltage circuit breakers will generate operation overvoltages with high amplitude and large frequency, which endanger the insulation safety of power system equipment. In related technologies, usually, the development characteristics of the airflow field in the arc extinguishing chamber during the opening process of the circuit breaker are determined through simulation to guide the design of the arc extinguishing chamber structure, thereby improving the breakdown voltage of the circuit breaker. However, there is a certain gap between the theoretical simulation and the experimental results, and it cannot fully reflect the development process of the airflow field in the arc extinguishing chamber. Summary of the Invention

[0003] The present invention provides a method and system for detecting the development characteristics of the airflow field in a circuit breaker arc extinguishing chamber, and solves the technical problem of how to improve the accuracy of detecting the development characteristics of the airflow field in the arc extinguishing chamber during the opening process of the circuit breaker.

[0004] In a first aspect of the present invention, a method for detecting the development characteristics of the airflow field in a circuit breaker arc extinguishing chamber is provided. The method includes the following steps:

[0005] Connect the circuit breaker to be tested with a moving and static contact spacing adjusting device so that the spacing between the moving contact and the static contact of the circuit breaker to be tested is adjustable;

[0006] Set a high-speed camera and a light source device in the arc extinguishing chamber of the circuit breaker to be tested, align the high-speed camera with the movement area of the moving contact and the static contact in the arc extinguishing chamber, and connect the high-speed camera with a servo controller and a schlieren imaging device;

[0007] Adjust the spacing between the moving contact and the static contact in the arc extinguishing chamber through the moving and static contact spacing adjusting device, trigger the high-speed camera to take pictures at a preset frequency through the servo controller, and enable the schlieren imaging device to obtain schlieren images at different contact opening distances;

[0008] Analyze the obtained schlieren images to obtain the development characteristics of the airflow field in the arc extinguishing chamber of the circuit breaker to be tested.

[0009] According to an implementable manner of the first aspect of the present invention, the adjusting the spacing between the moving contact and the static contact in the arc extinguishing chamber through the moving and static contact spacing adjusting device includes:

[0010] Gradually increase the spacing between the moving contact and the static contact in the arc extinguishing chamber within a preset distance range.

[0011] According to an implementable manner of the first aspect of the present invention, gradually increasing the distance between the moving contact and the static contact in the arc extinguishing chamber within a preset distance range includes:

[0012] Set the preset distance range to 1 - 1.5 cm.

[0013] According to an implementable manner of the first aspect of the present invention, gradually increasing the distance between the moving contact and the static contact in the arc extinguishing chamber within a preset distance range includes:

[0014] Adjust the distances between the moving contact and the static contact in the arc extinguishing chamber to 1.1 cm, 1.2 cm, and 1.4 cm in sequence, so that the schlieren imaging device obtains schlieren images with contact opening distances of 1.1 cm, 1.2 cm, and 1.4 cm.

[0015] According to an implementable manner of the first aspect of the present invention, analyzing the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested includes:

[0016] Mark time stamps on the obtained schlieren images;

[0017] Analyze the schlieren images at the same contact opening distance to obtain the development trajectory data of the gas flow field in the arc extinguishing chamber, and associate the gas flow field development trajectory data with the corresponding time stamps to obtain the development characteristics of the gas flow field in the arc extinguishing chamber changing with time at the corresponding contact opening distance.

[0018] According to an implementable manner of the first aspect of the present invention, analyzing the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested further includes:

[0019] Analyze the schlieren images at the same contact opening distance to determine the starting state and / or ending state of the gas flow field in the arc extinguishing chamber, and mark the corresponding schlieren images with status.

[0020] According to an implementable manner of the first aspect of the present invention, the method further includes:

[0021] Set a temperature sensor in the arc extinguishing chamber of the circuit breaker to be tested to detect the temperature in the arc extinguishing chamber;

[0022] Analyzing the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested includes:

[0023] Mark time stamps on the obtained schlieren images and the temperature data of the temperature sensor respectively;

[0024] Match the corresponding temperature data to each of the schlieren images according to the marked time stamps;

[0025] Analyze each schlieren image at the same contact opening distance to obtain the airflow field development trajectory data in the arc extinguishing chamber, and associate the airflow field development trajectory data with the corresponding temperature data to obtain the airflow field development characteristics in the arc extinguishing chamber that vary with temperature at the corresponding contact opening distance.

[0026] The second aspect of the present invention provides a detection system for the airflow field development characteristics in a circuit breaker arc extinguishing chamber. The detection system is used to execute the method for detecting the airflow field development characteristics in the circuit breaker arc extinguishing chamber described in any one of the above realizable ways. The detection system includes a moving and static contact spacing adjustment device, a high-speed camera, a light source device, a servo controller, a schlieren imaging device, and a data processing device;

[0027] The moving and static contact spacing adjustment device is connected to the circuit breaker to be tested and is used to adjust the spacing between the moving contact and the static contact of the circuit breaker to be tested;

[0028] The high-speed camera and the light source device are arranged in the arc extinguishing chamber of the circuit breaker to be tested. The high-speed camera is aligned with the movement area of the moving contact and the static contact in the arc extinguishing chamber, and the light source device is used to provide illumination when the high-speed camera takes pictures;

[0029] The high-speed camera is connected to the servo controller and the schlieren imaging device. The servo controller is used to trigger the high-speed camera to take pictures at a preset frequency, and the schlieren imaging device is used to obtain the schlieren images at different contact opening distances taken by the high-speed camera;

[0030] The data processing device is used to analyze the obtained schlieren images to obtain the airflow field development characteristics in the arc extinguishing chamber of the circuit breaker to be tested.

[0031] According to a realizable way of the second aspect of the present invention, the detection system further includes a temperature sensor;

[0032] The temperature sensor is arranged in the arc extinguishing chamber of the circuit breaker to be tested to detect the temperature in the arc extinguishing chamber;

[0033] The data processing device is further used to analyze the obtained schlieren images in combination with the temperature data detected by the temperature sensor to obtain the airflow field development characteristics in the arc extinguishing chamber that vary with temperature at the corresponding contact opening distance.

[0034] According to a realizable way of the second aspect of the present invention, the moving and static contact spacing adjustment device includes a lead screw, an adjusting handle, a thrust ball bearing, an insulating pull rod, and a ranging device;

[0035] The adjusting handle is connected to one end of the lead screw. The other end of the lead screw is connected to one end of the insulating pull rod through the thrust ball bearing. The other end of the insulating pull rod is connected to the moving contact of the circuit breaker to be tested;

[0036] The ranging device is used to obtain the movement amount of the lead screw, so as to determine the contact opening distance of the circuit breaker to be tested according to the movement amount.

[0037] As can be seen from the above technical solutions, the present invention has the following advantages:

[0038] The present invention connects the circuit breaker to be tested with the moving and static contact spacing adjusting device, so that the distance between the moving contact and the static contact of the circuit breaker to be tested can be adjusted; a high-speed camera and a light source device are arranged in the arc extinguishing chamber of the circuit breaker to be tested, and the high-speed camera is aligned with the moving area of the moving contact and the static contact in the arc extinguishing chamber, and the high-speed camera is connected to the servo controller and the schlieren imaging device; the distance between the moving contact and the static contact in the arc extinguishing chamber is adjusted by the moving and static contact spacing adjusting device, the high-speed camera is triggered by the servo controller to take pictures at a preset frequency, so that the schlieren imaging device obtains schlieren images at different contact opening distances; the obtained schlieren images are analyzed to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested; the present invention obtains the schlieren images of the moving area of the moving and static contacts in the arc extinguishing chamber of the circuit breaker to be tested at different contact opening distances through experiments, and then determines the development characteristics of the gas flow field in the arc extinguishing chamber according to the analysis results of the schlieren images. The detection method is simple and convenient, and compared with the method of determining the development characteristics of the gas flow field in the arc extinguishing chamber during the opening process of the circuit breaker through simulation, it can more accurately reflect the real change of the gas flow field in the arc extinguishing chamber, thereby improving the accuracy of detecting the development characteristics of the gas flow field in the arc extinguishing chamber during the opening process of the circuit breaker. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is a flowchart of a method for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker provided by an optional embodiment of the present invention;

[0041] Figure 2 It is a structural block diagram of a system for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker provided by an optional embodiment of the present invention;

[0042] Figure 3 It is a structural block diagram of a moving and static contact spacing adjusting device provided by an optional embodiment of the present invention.

[0043] Reference Signs:

[0044] 1 - Moving and static contact spacing adjustment device; 2 - High - speed camera; 3 - Light source device; 4 - Servo controller; 5 - Schlieren imaging device; 6 - Data processing device; 7 - Temperature sensor; 11 - Lead screw; 12 - Adjusting handle; 13 - Distance measuring device; 14 - Thrust ball bearing; 15 - Insulating pull rod. Specific implementation mode

[0045] An embodiment of the present invention provides a method and system for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker, which is used to solve the technical problem of how to improve the accuracy of detecting the development characteristics of the gas flow field in the arc extinguishing chamber during the opening process of the circuit breaker.

[0046] In order to make the invention purpose, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0047] The present invention provides a method for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker.

[0048] Please refer to Figure 1 , Figure 1 which shows a flowchart of a method for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker provided by an embodiment of the present invention.

[0049] A method for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker provided by an embodiment of the present invention includes steps S1 - S4.

[0050] Step S1: Connect the circuit breaker to be tested with the moving and static contact spacing adjustment device 1 so that the spacing between the moving contact and the static contact of the circuit breaker to be tested can be adjusted.

[0051] By connecting the circuit breaker to be tested with the moving and static contact spacing adjustment device 1, the transmission mode of the conventional circuit breaker can be changed to the electrode distance adjustment mode, so that the spacing between the moving contact and the static contact of the circuit breaker to be tested can be adjusted.

[0052] It should be noted that an existing moving and static contact spacing adjustment device can be used as the moving and static contact spacing adjustment device 1 to make the spacing between the moving contact and the static contact of the circuit breaker to be tested adjustable.

[0053] Step S2, a high-speed camera 2 and a light source device 3 are arranged in the arc extinguishing chamber of the circuit breaker to be tested. The high-speed camera 2 is aligned with the moving area of the moving contact and the static contact in the arc extinguishing chamber, and the high-speed camera 2 is connected to the servo controller 4 and the schlieren imaging device 5.

[0054] Wherein, the moving area includes the moving contact and the static contact in the arc extinguishing chamber, and the area between the moving contact and the static contact, so that the obtained schlieren image can clearly present the change of the air flow field in the arc extinguishing chamber.

[0055] During the opening process in the arc extinguishing chamber of the circuit breaker, the air flow field is in an instantaneous change state. To better record the change of the air flow field during the opening process of the circuit breaker, it is necessary to cooperate with a high-sensitivity high-speed camera for recording and shooting. As a specific implementation method, in this test, the high-speed camera adopts the Phantom v711 model. This model of high-speed camera uses a unique CMOS sensor with ultra-high sensitivity. The shooting rate at 1 million pixels can reach 7,500 frames per second, and the highest shooting rate can reach 1,400,000 frames per second. The specific relevant parameters are shown in Table 1.

[0056] Table 1:

[0057] Highest resolution 1280×800 Highest shooting rate 1,400,000 frames per second Number of pixels 1024000 Continuously adjustable resolution 128×8 Pixel size 20um Digital output 8 / 12 bits Sensitivity 20,000 black and white / 2,500 color Minimum exposure time 1us (300ns)

[0058] Step S3, the distance between the moving contact and the static contact in the arc extinguishing chamber is adjusted by the moving and static contact distance adjusting device 1, and the high-speed camera 2 is triggered by the servo controller 4 to shoot at a preset frequency, so that the schlieren imaging device 5 obtains schlieren images at different contact opening distances.

[0059] In a realizable manner, when adjusting the distance between the moving contact and the static contact in the arc extinguishing chamber by the moving and static contact distance adjusting device 1, the following is specifically executed:

[0060] Gradually increase the distance between the moving contact and the static contact in the arc extinguishing chamber within the preset distance range.

[0061] As a realizable manner, the preset distance range is set to 1 - 1.5 cm.

[0062] During specific implementation, for example, the distance between the moving contact and the static contact in the arc extinguishing chamber can be adjusted to 1.1 cm, 1.2 cm, and 1.4 cm in sequence, so that the schlieren imaging device 5 obtains three groups of schlieren images with contact opening distances of 1.1 cm, 1.2 cm, and 1.4 cm.

[0063] In the above embodiments of the present invention, by adjusting the opening distance between the moving and static contacts in the arc extinguishing chamber of the circuit breaker, and using a schlieren imaging device combined with a high-speed camera to observe the change of the gas flow field in the arc extinguishing chamber during the opening of the contacts, combined with the actual situation of the on-site test equipment, the development process of the gas flow field in the arc extinguishing chamber under multiple contact opening distances is photographed and recorded. The method is simple and convenient, and the schlieren images taken can truly reflect the development process of the gas flow field in the arc extinguishing chamber.

[0064] Step S4: Analyze the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested.

[0065] In an implementable manner, the analyzing the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested includes:

[0066] Mark time stamps for the obtained schlieren images;

[0067] Analyze the schlieren images under the same contact opening distance to obtain the development trajectory data of the gas flow field in the arc extinguishing chamber, and associate the gas flow field development trajectory data with the corresponding time stamps to obtain the development characteristics of the gas flow field in the arc extinguishing chamber changing with time under the corresponding contact opening distance.

[0068] In the embodiments of the present invention, by analyzing and processing each schlieren image, the development characteristics of the gas flow field in the arc extinguishing chamber changing with time under different contact opening distances are obtained, realizing the detection of the development characteristics of the gas flow field inside the arc extinguishing chamber of the circuit breaker under different contact opening distances.

[0069] In an implementable manner, the analyzing the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested further includes:

[0070] Analyze the schlieren images under the same contact opening distance to determine the starting state and / or ending state of the gas flow field in the arc extinguishing chamber, and mark the corresponding schlieren images with the state.

[0071] In this embodiment, by marking the starting state and / or ending state of the gas flow field in the arc extinguishing chamber, it is beneficial to improve the detection efficiency.

[0072] In an implementable manner, the method further includes:

[0073] Set a temperature sensor 7 in the arc extinguishing chamber of the circuit breaker to be tested to detect the temperature in the arc extinguishing chamber;

[0074] The analyzing the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested includes:

[0075] Mark time stamps for the obtained schlieren images and the temperature data of the temperature sensor 7 respectively;

[0076] Match corresponding temperature data to each of the schlieren images according to the marked timestamps.

[0077] Analyze each of the schlieren images at the same contact opening distance to obtain the airflow field development trajectory data in the arc extinguishing chamber, and associate the airflow field development trajectory data with the corresponding temperature data to obtain the airflow field development characteristics in the arc extinguishing chamber that vary with temperature at the corresponding contact opening distance.

[0078] In the embodiments of the present invention, by setting a temperature sensor, the detection of the airflow field development characteristics in the arc extinguishing chamber that vary with temperature at different contact opening distances is realized. The method is simple and convenient and easy to implement.

[0079] The present invention also provides a detection system for the airflow field development characteristics in the arc extinguishing chamber of a circuit breaker. The detection system is used to execute the method for detecting the airflow field development characteristics in the arc extinguishing chamber of a circuit breaker described in any one of the above embodiments.

[0080] Please refer to Figure 2 , Figure 2 which shows a structural block diagram of a detection system for the airflow field development characteristics in the arc extinguishing chamber of a circuit breaker provided by an embodiment of the present invention.

[0081] A detection system for the airflow field development characteristics in the arc extinguishing chamber of a circuit breaker provided by an embodiment of the present invention includes a moving and static contact spacing adjusting device 1, a high-speed camera 2, a light source device 3, a servo controller 4, a schlieren imaging device 5, and a data processing device 6.

[0082] Among them, the moving and static contact spacing adjusting device 1 is connected to the circuit breaker to be tested and is used to adjust the spacing between the moving contact and the static contact of the circuit breaker to be tested; the high-speed camera 2 and the light source device 3 are arranged in the arc extinguishing chamber of the circuit breaker to be tested. The high-speed camera 2 is aligned with the movement area of the moving contact and the static contact in the arc extinguishing chamber, and the light source device 3 is used to provide illumination when the high-speed camera 2 takes pictures; the high-speed camera 2 is connected to the servo controller 4 and the schlieren imaging device 5. The servo controller 4 is used to trigger the high-speed camera 2 to take pictures at a preset frequency, and the schlieren imaging device 5 is used to obtain the schlieren images at different contact opening distances taken by the high-speed camera 2; the data processing device 6 is used to analyze the obtained schlieren images to obtain the airflow field development characteristics in the arc extinguishing chamber of the circuit breaker to be tested.

[0083] In a feasible implementation manner, the detection system further includes a temperature sensor 7;

[0084] The temperature sensor 7 is arranged in the arc extinguishing chamber of the circuit breaker to be tested to detect the temperature in the arc extinguishing chamber;

[0085] The data processing device 6 is further configured to analyze the obtained schlieren image in combination with the temperature data detected by the temperature sensor 7, so as to obtain the development characteristics of the gas flow field in the arc extinguishing chamber varying with temperature under the corresponding contact opening distance.

[0086] In an implementable manner, as Figure 3 shown, the moving and static contact spacing adjusting device 1 includes a lead screw 11, an adjusting handle 12, a thrust ball bearing 14, an insulating pull rod 15, and a ranging device 13;

[0087] The adjusting handle 12 is connected to one end of the lead screw 11, the other end of the lead screw 11 is connected to one end of the insulating pull rod 15 through the thrust ball bearing 14, and the other end of the insulating pull rod 15 is connected to the moving contact of the circuit breaker to be measured;

[0088] The ranging device 13 is configured to obtain the movement amount of the lead screw 11, so as to determine the contact opening distance of the circuit breaker to be measured according to the movement amount.

[0089] In the embodiment of the present invention, the electrode distance adjustment adopts a lead screw drive mode. The adjusting handle 12 is used to rotate the lead screw 11, and then the rotation of the lead screw 11 is converted into a linear motion through the thrust ball bearing 14, so as to drive the insulating pull rod 15 to perform opening and closing actions. The transmission ratio between the lead screw 11 and the internal moving contact is 1:1. This transmission mode is simple and reliable and convenient for measurement, and the adjustment accuracy can reach 0.5 mm.

[0090] Preferably, the connection mode between the other end of the insulating pull rod 15 and the moving contact of the circuit breaker to be measured is a threaded connection. The insulating pull rod 15 adopts a threaded connection, which can ensure a high transmission accuracy, so that the contact opening distance of the circuit breaker to be measured can be indirectly obtained directly through the movement amount of the external lead screw 11.

[0091] In the embodiment of the present invention, the accurate movement of the distance between the breaker contacts is ensured by the lead screw movement, which is beneficial to improving the accuracy of the movement of the breaker contact gap.

[0092] It should be noted that the ranging device 13 can be implemented by using any ranging equipment in the prior art to measure the movement amount of the lead screw 11. For example, the ranging device 13 can include a ranging caliper, and the movement amount of the lead screw 11 is obtained through the ranging caliper, so as to accurately measure the distance between the moving contact and the static contact.

[0093] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker, characterized in that, It includes the following steps: Connect the circuit breaker to be tested with the moving and static contact spacing adjusting device so that the spacing between the moving contact and the static contact of the circuit breaker to be tested can be adjusted; Set a high-speed camera and a light source device in the arc extinguishing chamber of the circuit breaker to be tested, align the high-speed camera with the movement area of the moving contact and the static contact in the arc extinguishing chamber, and connect the high-speed camera to the servo controller and the schlieren imaging device; Adjust the spacing between the moving contact and the static contact in the arc extinguishing chamber through the moving and static contact spacing adjusting device, trigger the high-speed camera to take pictures at a preset frequency through the servo controller, and enable the schlieren imaging device to obtain schlieren images at different contact opening distances; Analyze the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested; The adjusting the spacing between the moving contact and the static contact in the arc extinguishing chamber through the moving and static contact spacing adjusting device includes: Gradually increase the spacing between the moving contact and the static contact in the arc extinguishing chamber within a preset distance range; The gradually increasing the spacing between the moving contact and the static contact in the arc extinguishing chamber within a preset distance range includes: Set the preset distance range to 1 - 1.5 cm; The analyzing the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested includes: Mark time stamps on the obtained schlieren images; Analyze each schlieren image at the same contact opening distance to obtain the development trajectory data of the gas flow field in the arc extinguishing chamber, and associate the gas flow field development trajectory data with the corresponding time stamp to obtain the development characteristics of the gas flow field in the arc extinguishing chamber changing with time at the corresponding contact opening distance; The analyzing the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested further includes: Analyze each schlieren image at the same contact opening distance to determine the starting state and / or ending state of the gas flow field in the arc extinguishing chamber, and mark the corresponding schlieren images with states.

2. The method for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker according to claim 1, wherein The gradually increasing the spacing between the moving contact and the static contact in the arc extinguishing chamber within a preset distance range includes: Adjust the spacing between the moving contact and the static contact in the arc extinguishing chamber to 1.1 cm, 1.2 cm, and 1.4 cm in sequence so that the schlieren imaging device can obtain schlieren images with contact opening distances of 1.1 cm, 1.2 cm, and 1.4 cm.

3. The method for detecting the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker according to claim 1, wherein, The method further includes: Set a temperature sensor in the arc extinguishing chamber of the circuit breaker to be tested to detect the temperature in the arc extinguishing chamber; The analyzing the obtained schlieren images to obtain the development characteristics of the gas flow field in the arc extinguishing chamber of the circuit breaker to be tested includes: Mark time stamps on the obtained schlieren images and the temperature data of the temperature sensor respectively; Match the corresponding temperature data for each of the schlieren images according to the marked time stamps; Analyze each schlieren image at the same contact opening distance to obtain the development trajectory data of the gas flow field in the arc extinguishing chamber, and associate the gas flow field development trajectory data with the corresponding temperature data to obtain the development characteristics of the gas flow field in the arc extinguishing chamber changing with temperature at the corresponding contact opening distance.

4. A detection system for the development characteristics of the gas flow field in a circuit breaker arc extinguishing chamber, characterized in that The detection system is used to execute the detection method for the development characteristics of the air flow field in the arc extinguishing chamber of the circuit breaker as described in any one of claims 1 to 3. The detection system includes a moving and static contact spacing adjusting device, a high-speed camera, a light source device, a servo controller, a schlieren imaging device, and a data processing device; The moving and static contact spacing adjusting device is connected to the circuit breaker to be measured and is used to adjust the spacing between the moving contact and the static contact of the circuit breaker to be measured; The high-speed camera and the light source device are arranged in the arc extinguishing chamber of the circuit breaker to be measured. The high-speed camera is aligned with the movement area of the moving contact and the static contact in the arc extinguishing chamber, and the light source device is used to provide illumination when the high-speed camera takes pictures; The high-speed camera is connected to the servo controller and the schlieren imaging device. The servo controller is used to trigger the high-speed camera to take pictures at a preset frequency, and the schlieren imaging device is used to obtain the schlieren images at different contact opening distances taken by the high-speed camera; The data processing device is used to analyze the obtained schlieren images to obtain the development characteristics of the air flow field in the arc extinguishing chamber of the circuit breaker to be measured.

5. The detection system for the development characteristics of the gas flow field in the arc extinguishing chamber of a circuit breaker according to claim 4, characterized in that The detection system further includes a temperature sensor; The temperature sensor is arranged in the arc extinguishing chamber of the circuit breaker to be measured to detect the temperature in the arc extinguishing chamber; The data processing device is further used to analyze the obtained schlieren images in combination with the temperature data detected by the temperature sensor to obtain the development characteristics of the air flow field in the arc extinguishing chamber changing with temperature at the corresponding contact opening distance.

6. The air flow field development characteristic detection system in the arc extinguishing chamber of the circuit breaker according to claim 4, characterized in that The moving and static contact spacing adjusting device includes a lead screw, an adjusting handle, a thrust ball bearing, an insulating pull rod, and a distance measuring device; The adjusting handle is connected to one end of the lead screw, the other end of the lead screw is connected to one end of the insulating pull rod through the thrust ball bearing, and the other end of the insulating pull rod is connected to the moving contact of the circuit breaker to be measured; The distance measuring device is used to obtain the movement amount of the lead screw to determine the contact opening distance of the circuit breaker to be measured according to the movement amount.

Images