A partial discharge detection device and method for switchgear

Abstract

This invention provides a partial discharge detection device for switchgear, relating to the field of switchgear detection. The device includes three sensors for detecting partial discharge and two supports with extensions at a certain angle. The three sensors are located at the intersection of the supports and at two distal ends. Visible light emitters are positioned at the intersection and one of the distal ends of the supports, mounted on a rotating disk controlled by a servo motor. The rotating disk is concentric with the intersection and distal ends of the supports. The supports are configured to receive signals from the three sensors and control the rotation angle of the rotating disk. This device detects the distance to the discharge location using the three sensors and calculates the discharge position. It uses two visible light emitters to emit visible light, adjusts the angle, and determines the discharge location by the intersection of the two beams. This setup allows for relatively convenient location of the discharge.

Description

Technical Field

[0001] This invention relates to the field of switchgear testing, specifically to a partial discharge detection device for switchgear. Background Technology

[0002] To address the causes of partial discharge in switchgear, partial discharge detection technology is used to locate the fault. Generally, detection techniques are divided into electrical and non-electrical methods. Electrical methods primarily utilize radio waves for detection, offering high sensitivity and ease of use. Non-electrical methods employ ultrasonic detection, typically used for pinpointing the location of partial discharge.

[0003] CN110568323A discloses a partial discharge detection system and method for switchgear, used to detect the partial discharge status of high-voltage switchgear. The partial discharge detection system includes a discharge signal acquisition device, a noise assessment device, an information processing device, and a filtering device. The discharge signal acquisition device acquires the partial discharge signal from the high-voltage switchgear; the noise assessment device records and performs time-frequency analysis on the background noise, generating a preset measurement spectrum range and a preset measurement threshold; the information processing device generates preset voltage information based on the preset measurement spectrum range and the preset measurement threshold; and the filtering device filters the partial discharge signal based on the preset voltage information. The partial discharge detection system and method provided in this application can solve the problems of low efficiency and large measurement errors in traditional solutions for monitoring partial discharge in switchgear. However, this technical solution cannot accurately determine the discharge location. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a partial discharge detection device for switchgear, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a partial discharge detection device for switchgear, comprising three sensors for detecting partial discharge, and two brackets with extensions at a certain angle. The three sensors are respectively located at the intersection end and two distal ends of the brackets. A visible light emitter is provided at the intersection end and one of the distal ends of the brackets. The visible light emitter is mounted on a rotating disk controlled by a servo motor. The rotating disk is concentric with the intersection end and one of the distal ends of the brackets. The bracket is equipped with a controller that receives signals from the three sensors and sends control signals to control the rotation angle of the rotating disk and to activate and deactivate the visible light emitter.

[0006] Preferably, the rotating disk includes a fixed base, which is fixedly connected to a bracket. A servo motor is fixedly installed at the center of the fixed base, and a carrier plate is fixedly installed at the output end of the servo motor. A visible light emitter is fixedly installed above the carrier plate. A support ring that contacts the fixed base and is rotatably connected to the fixed base is provided at the bottom of the carrier plate. The fixed base is provided with a height leveling unit for adjusting the optical paths of the two visible light emitters to coincide.

[0007] Preferably, the bracket includes a central hinge shaft and two extensions hinged to the hinge shaft. Each extension is equipped with an angle tester that records the rotation angle relative to the hinge shaft. The two extensions have different lengths, with one extension having a rotating disk that is shorter than the other. Sensors are installed below the hinge shaft and below the distal end of the extension, respectively.

[0008] Preferably, the outer surface of the sensor is provided with a fixed frame, and a height adjustment mechanism is provided between the fixed frame and the bracket. The height adjustment mechanism is used to adjust the distance between the sensor and the bracket so that the bottom surfaces of the three sensors are on the same horizontal plane.

[0009] Preferably, the extension of the bracket without the visible light emitter is a telescopic slide rod, and both the fixed end and the moving end of the telescopic slide rod are provided with hinges so that when the hinges are folded, the sensor at the far end of the hinge is located directly above the sensor at the interactive end.

[0010] Preferably, magnetic support parts are fixedly installed on the bottom surface of both the moving end and the bottom surface of the fixed end of the telescopic sleeve slide rod, and the magnetic support parts are also fixedly installed below the extension part.

[0011] A method for detecting partial discharge in switchgear includes the following steps:

[0012] Detect the sensor and connect the sensor to the fixed frame;

[0013] The sensor at the junction is placed on either side of the suspected discharge point, and the signal is detected simultaneously by three sensors.

[0014] Record the initial value of the signal amplitude detected by the sensor and transmit it to the controller, which then converts the initial value of the signal amplitude into the distance between the discharge point and the sensor.

[0015] Adjust the position of the three sensors vertically to ensure that the discharge point is located inside the opening of the bracket.

[0016] Record the distance between the sensor and the discharge point again after adjusting the position. Keep the position of the bracket intersection point unchanged, adjust the position of the bracket, and then record the distance between the sensor and the discharge point again.

[0017] The controller establishes a system of equations centered on the intersection point to determine the planar position of the discharge point, and adjusts the rotating disk so that the light rays emitted by the two visible light emitters converge at the discharge point, and marks the position.

[0018] Preferably, after placing the bracket at the marked position and folding the extension of the rotating hinge, the sensor at the far end of the extension is located directly above the sensor at the interactive end. The distance between the discharge point and the sensor is measured again to determine the spatial position of the discharge point.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This switchgear partial discharge detection device detects the distance to the discharge location using three sensors and calculates the discharge location. It also uses two visible light emitters to emit visible light, adjusts the angle, and determines the discharge location by the intersection of the two beams. This setup makes it relatively easy to find the discharge location.

[0021] 2. The partial discharge detection device for the switchgear includes a bracket comprising a central hinge shaft and two extensions hinged to the hinge shaft. Each extension is equipped with an angle tester to record the rotation angle relative to the hinge shaft. The two extensions have different lengths, with one extension mounting a rotating disk being shorter than the other. Sensors are respectively installed below the hinge shaft and below the far end of the extension. By setting the extensions, they can rotate relative to the hinge shaft, and the rotation angle can be measured by the angle tester, thus enabling calculation.

[0022] 3. The partial discharge detection device for this switchgear involves adjusting the positions of the three sensors vertically to determine that the discharge point is located inside the bracket opening. If the position of the three sensors is adjusted downwards, the distance from the upper sensor to the discharge point decreases, while the distance from the lower sensor to the discharge point increases. This indicates that the actual discharge point is at the bracket opening. If two sensors detect a decrease in distance, it indicates that the discharge point is located in the opposite direction of the bracket opening. In this case, the bracket needs to be flipped to avoid false detection.

[0023] 4. The partial discharge detection device for the switchgear involves placing the bracket at the marked position, rotating the hinge and folding the extension, with the sensor at the far end of the extension positioned directly above the sensor at the interaction end. The distance between the discharge point and the sensor is measured again to determine the spatial location of the discharge point. Since the discharge point is in the spatial location of the switchgear, the two sensors are set on the same straight line as the discharge point measured on the plane. The transmission distance is measured again. The sensor at the marked position is used to determine the distance of the discharge point perpendicular to the plane, while the bent sensor is used for auxiliary verification and to determine whether the discharge point is inside the switchgear. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the rotating disk connection of the present invention;

[0026] Figure 3 This is a schematic diagram of the hinge shaft connection of the present invention;

[0027] Figure 4 This is a schematic diagram of the height adjustment mechanism of the present invention;

[0028] Figure 5 This is a schematic diagram of the telescopic sleeve slide rod connection of the present invention;

[0029] Figure 6 This is a schematic diagram of the rotation calculation of the bracket of the present invention.

[0030] In the diagram: 1. Sensor; 2. Bracket; 3. Visible light emitter; 4. Rotary disk; 5. Controller; 401. Fixing base; 402. Servo motor; 403. Bearing plate; 404. Support ring; 405. Height leveling unit; 201. Hinge shaft; 202. Extension; 203. Angle tester; 6. Fixing frame; 7. Magnetic support; 204. Height adjustment mechanism; 205. Telescopic slide rod; 206. Hinge. Detailed Implementation

[0031] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0035] like Figure 1-6 As shown, a partial discharge detection device for switchgear includes three sensors 1 for detecting partial discharge, and two brackets 2 with extensions 202 at a certain angle. The three sensors 1 are located at the intersection end and two distal ends of the brackets 2, respectively. A visible light emitter 3 is provided at the intersection end and one of the distal ends of the brackets 2. The visible light emitter 3 is mounted on a rotating disk 4 controlled by a servo motor 402. The rotating disk 4 is concentric with the intersection end and one of the distal ends of the brackets 2. The brackets 2 are equipped with a controller 5 that receives signals from the three sensors 1 and sends control signals to control the rotation angle of the rotating disk 4 and to turn on and off the visible light emitter 3. The distance to the discharge position is detected by the three sensors 1, and the discharge position is determined by calculation. Visible light is emitted by the two visible light emitters 3, and the angle is adjusted. The discharge position is determined by the intersection of the two beams of light. This setup makes it relatively easy to find the discharge position.

[0036] The rotating disk 4 includes a fixed base 401, which is fixedly connected to the bracket 2. A servo motor 402 is fixedly installed at the center of the fixed base 401. A carrier disk 403 is fixedly installed at the output end of the servo motor 402. A visible light emitter 3 is fixedly installed above the carrier disk 403. A support ring 404 is provided at the bottom of the carrier disk 403, which contacts the fixed base 401 and is rotatably connected to the fixed base 401. The fixed base 401 is provided with a height leveling unit 405 for adjusting the optical paths of the two visible light emitters 3 to coincide. The rotation angle of the carrier disk 403 can be precisely adjusted through the servo motor 402 and gear transmission. This solution is only one embodiment of driving the visible light emitter 3 to rotate. Similarly, other high-precision rotation mechanisms in the prior art can also be used to adjust the carrier disk 403.

[0037] The bracket 2 includes a central hinge shaft 201 and two extensions 202 hinged to the hinge shaft 201. Each extension 202 is equipped with an angle tester 203 to record the rotation angle relative to the hinge shaft 201. The two extensions 202 have different lengths, with one extension 202 that mounts the rotating disk 4 being shorter than the other extension 202. Sensors 1 are respectively installed below the hinge shaft 201 and below the far end of the extension 202. By setting the extensions 202, they can rotate relative to the hinge shaft 201, and the rotation angle can be measured by the angle tester 203, thereby enabling calculation.

[0038] A fixed frame 6 is provided on the outer surface of the sensor 1. A height adjustment mechanism 204 is provided between the fixed frame 6 and the bracket 2. The height adjustment mechanism 204 is used to adjust the distance between the sensor 1 and the bracket 2 so that the bottom surfaces of the three sensors 1 are on the same horizontal plane. Since the two extensions 202 are hinged to the same hinge shaft 201, there is a height difference. The height adjustment mechanism 204 can adjust the height to make the sensors 1 be on the same plane. The height adjustment mechanism 204 includes a sleeve and a sliding column, which are slidably connected and a threaded shaft is provided. The threaded shaft is used to fix the relative sliding length to achieve the function of adjusting the height.

[0039] The bracket 2 does not have an extension 202 for the visible light emitter 3 installed. It is a telescopic slide rod 205. Both the fixed end and the moving end of the telescopic slide rod 205 are provided with hinges 206 so that when the hinges 206 are folded, the sensor 1 at the far end of the hinges is located directly above the sensor 1 at the interactive end. This arrangement can change the relative position of the sensor 1, thereby measuring the spatial position.

[0040] The bottom surface of both the moving end and the bottom surface of the fixed end of the telescopic sleeve slide rod 205 are fixedly installed with magnetic support parts 7. The magnetic support parts 7 are also fixedly installed below the extension part 202. This arrangement makes it easy to fix the device.

[0041] A method for detecting partial discharge in switchgear includes the following steps:

[0042] Detect sensor 1 and connect sensor 1 to fixed frame 6, complete sensor 1 initialization, such as zeroing, test environment background sound and other operation steps, including preliminary detection to determine the approximate location of suspected discharge point;

[0043] Sensor 1 at the junction is placed on either side of the suspected discharge point, and the signal is detected simultaneously by three sensors 1.

[0044] The initial value time of the signal amplitude detected by sensor 1 is recorded and transmitted to controller 5. The initial value time of the signal amplitude is converted into the distance between the discharge point and sensor 1. Since the three sensors 1 are in different positions, there will be a difference between the emitted signals and the received signals. The signal transmission speed is constant and the time of receiving the generated signal amplitude is determined, so the distance between sensor 1 and the actual discharge point can be determined.

[0045] Adjust the position of the three sensors 1 vertically to determine that the discharge point is located inside the opening of the bracket 2. If the position of the three sensors 1 is adjusted downwards, the distance from the upper sensor 1 to the discharge point decreases, and the distance from the lower sensor 1 to the discharge point increases. This proves that the actual discharge point is at the opening of the bracket 2. If two sensors 1 detect a decrease in distance, it proves that the discharge point is in the opposite direction of the opening of the bracket 2, and the bracket 2 needs to be flipped.

[0046] Record the distance between sensor 1 and the discharge point again after adjusting the position. Keep the position of the intersection point of bracket 2 unchanged, adjust the position of bracket 2, and then record the distance between sensor 1 and the discharge point again. Keep the interaction point unchanged and measure the position on both sides.

[0047] The controller 5 establishes a system of equations centered on the intersection point to obtain the planar position of the discharge point, and adjusts the rotating disk 4 so that the light emitted by the two visible light emitters 3 converges at the discharge point, and marks the position.

[0048] like Figure 6 The intersection point is marked as A, and the actual discharge point is marked as P. The two distal endpoints are B and D for the first discharge and b and d for the second discharge. The specific lengths of AB and AD are known and remain unchanged, and AB=Ab, AD=Ad. The size of the initial angle BAD is also determined. The angle measuring instrument 203 measures the size of angles BAb and DAd. Now, AD is set as the x-axis direction, and a virtual y-axis direction perpendicular to AD is set. The position of point P is calculated by establishing a system of equations.

[0049] The position of point P is determined by calculating the specific angle of rotation of the rotating disk 4 located at points A and B so that the light emitted by the visible light emitter 3 coincides with point P. The position of the discharge point P can be expressed by the intersection of the light emitted by the two visible light emitters 3.

[0050] Place the intersection point of bracket 2 at the marked position. After rotating the hinge 206 and folding the extension 202, the sensor 1 at the far end of this part is located directly above the sensor 1 at the interaction end. Measure the distance between the discharge point and sensor 1 again to determine the spatial location of the discharge point. Since the discharge point is in the spatial location of the switch cabinet, set the two sensors 1 on the same straight line as the discharge point measured on the plane. Measure the transmission distance again. The sensor 1 at the marked position is used to determine the distance of the discharge point perpendicular to the plane, while the bent sensor 1 is used for auxiliary verification and to determine whether the discharge point is inside the switch cabinet.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0052] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A switch cabinet partial discharge detection device, comprising three sensors (1) for detecting partial discharge, further comprising a support (2) with two extension parts (202) at an angle, characterized in that: The three sensors (1) are located at the confluence end of the bracket (2) and at the two distal ends of the bracket (2), respectively; The support (2) is provided with a visible light emitter (3) at the interactive end and one of the remote ends. The visible light emitter (3) is set on a rotating disk (4) controlled by a servo motor (402). The rotating disk (4) is concentric with the interactive end and one of the remote ends of the support (2). The support (2) is provided with a controller (5) that receives signals from three sensors (1) and sends control signals to control the rotation angle of the rotating disk (4) and to turn on and off the visible light emitter (3). The bracket (2) includes a central hinge shaft (201) and two extensions (202) hinged to the hinge shaft (201). Each extension (202) is equipped with an angle tester (203) that records the rotation angle relative to the hinge shaft (201). The two extensions (202) have different lengths. One of the extensions (202) that mounts the rotating disk (4) is shorter than the other extension (202). The sensor (1) is installed below the hinge shaft (201) and below the far end of the extension (202), respectively. The bracket (2) without the visible light emitter (3) has an extension (202) which is a telescopic slide rod (205). The fixed end and the moving end of the telescopic slide rod (205) are both provided with hinges (206) so that when the hinge (206) is folded, the sensor (1) at the far end of the hinge is located directly above the sensor (1) at the interactive end.

2. The partial discharge detection device for switchgear according to claim 1, characterized in that: The rotating disk (4) includes a fixed base (401), which is fixedly connected to the bracket (2). A servo motor (402) is fixedly installed at the center of the fixed base (401). A carrier disk (403) is fixedly installed at the output end of the servo motor (402). A visible light emitter (3) is fixedly installed above the carrier disk (403). A support ring (404) is provided at the bottom end of the carrier disk (403) that contacts the fixed base (401) and is rotatably connected to the fixed base (401). The fixed base (401) is provided with a height leveling unit (405) for adjusting the optical paths of the two visible light emitters (3) to overlap.

3. The partial discharge detection device for switchgear according to claim 2, characterized in that: A fixed frame (6) is provided on the outer surface of the sensor (1). A height adjustment mechanism (204) is provided between the fixed frame (6) and the bracket (2). The height adjustment mechanism (204) is used to adjust the distance between the sensor (1) and the bracket (2) so that the bottom surfaces of the three sensors (1) are on the same horizontal plane.

4. The partial discharge detection device for switchgear according to claim 3, characterized in that: The bottom surface of the moving end and the bottom surface of the fixed end of the telescopic sleeve slide rod (205) are both fixedly installed with magnetic support parts (7), and the magnetic support parts (7) are also fixedly installed below the extension part (202).

5. A method for detecting partial discharge in a switchgear, characterized in that: Using the apparatus of claim 4, the steps include: Detect the sensor (1) and connect the sensor (1) to the fixed frame (6); The sensor (1) at the junction is set on either side of the suspected discharge point, and the signal is detected simultaneously by the three sensors (1); Record the initial value time of the signal amplitude detected by the sensor (1) and transmit it to the controller (5), converting the initial value time of the signal amplitude into the distance between the discharge point and the sensor (1); Adjust the position of the three sensors (1) up and down to determine that the discharge point is located inside the opening of the bracket (2); Record the distance between the sensor (1) and the discharge point again after adjusting the position. Keep the position of the intersection point of the bracket (2) unchanged, adjust the position of the bracket (2), and then record the distance between the sensor (1) and the discharge point again. The controller (5) establishes a set of equations with the intersection point as the center, obtains the planar position of the discharge point, and adjusts the rotating disk (4) so ​​that the light emitted by the two visible light emitters (3) converges at the discharge point and marks the position.

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