A real-time monitoring and positioning device for partial discharge of power equipment

Abstract

The present invention relates to the technical field of partial discharge monitoring, and specifically to a real-time monitoring and positioning device for partial discharge of electric power equipment, comprising an ultrasonic sensor, a mounting shell, a magnetic base, a drive assembly, and a stabilizing assembly; the drive assembly drives the ultrasonic sensor to move along one end of an air pressure chamber to the other end, and the paths of adjacent ultrasonic sensors are non-parallel when they are displaced. The present invention drives two groups of ultrasonic sensors to generate two preset non-parallel displacements in the mounting shell through the drive assembly, thereby causing the symmetry plane between the two groups of sensors to change, and the distance from the discharge position to change in different directions. After the sensor is displaced, the signal of the discharge point is secondary measured and positioned, thereby achieving the effect of accurately positioning the discharge point that cannot be accurately positioned, and preventing the discharge signal from being temporarily generated and unable to be accurately positioned, thereby causing a safety hazard.

Description

Technical Field

[0001] The present invention relates to the technical field of partial discharge monitoring, and in particular to a device for real-time monitoring and positioning partial discharge of electric power equipment. Background Art

[0002] During power system operation and maintenance, partial discharge (PD) detection is a key method for assessing the insulation condition of high-voltage power equipment. Its core purpose is to promptly detect weak discharges caused by insulation defects within the equipment, providing early warning of potential insulation degradation and preventing it from developing into severe insulation breakdown, thereby ensuring safe and stable grid operation.

[0003] Acoustic localization technology for partial discharge (PD) in power equipment typically utilizes multiple ultrasonic sensors to receive the ultrasonic signals generated by the discharge. The spatial location of the discharge point is determined by analyzing the time difference between the signals' arrival at the different sensors. However, when the source of the PD is located near the symmetrical planes of two sensors—that is, when the straight-line distance between the discharge point and the two sensors is close—the ultrasonic signal travels along nearly identical paths to the two sensors, resulting in the signals arriving at the same instant. Consequently, the localization algorithm cannot precisely pinpoint the specific location on the symmetrical planes of the two sensors where the discharge signal originates. Furthermore, sometimes only brief or intermittent discharges occur. This can create safety hazards if the discharge point cannot be accurately located and repaired during the discharge period. In the existing technology, attempts have been made to alleviate the positioning ambiguity problem by increasing the number of sensors, optimizing the deployment strategy, or introducing more complex multi-source information fusion algorithms. However, simply increasing the number of sensors will significantly increase system cost and installation and maintenance complexity. Although optimizing the deployment strategy can reduce some symmetrical areas, neither can eliminate the problem of difficulty in locating local discharges on the symmetrical surfaces of the two sensors. When processing equidistant signals from symmetrical points, complex fusion algorithms have limited effect on improving positioning accuracy due to the small difference in key time difference information, and may significantly increase the computational burden, making it difficult to meet the rapid response requirements of real-time online monitoring.

[0004] Therefore, a real-time monitoring and positioning device for partial discharge of power equipment is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a real-time monitoring and positioning device for partial discharge of power equipment, which solves the problem that the partial discharge position cannot be accurately measured when the partial discharge is on the symmetrical plane of two groups of sensors. When the sensor detects that the distance between two adjacent groups of sensors is small, the driving component controls the two groups of sensors to perform two non-parallel displacements respectively, thereby changing the time difference between the ultrasonic wave generated at the partial discharge position and the sensor position, and thus re-measuring the partial discharge position.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A real-time monitoring and positioning device for partial discharge of electric power equipment comprises an ultrasonic sensor, a mounting shell, a magnetic base, a drive assembly and a stabilizing assembly; the inner cavity of the mounting shell is provided with an air pressure chamber and a regulating chamber, the air pressure chamber is connected to a micro air pump, and a pressure regulating plate is provided between the air pressure chamber and the regulating chamber; the ultrasonic sensor is arranged in the air pressure chamber and is located at the end of the air pressure chamber; the magnetic base is connected to the mounting shell, and the mounting shell is mounted on the surface of a switch cabinet through the magnetic base; the drive assembly is arranged at both axial ends of the mounting shell, the stabilizing assembly is arranged in the air pressure chamber and is connected to the pressure regulating plate; the ultrasonic sensors are evenly distributed on the surface of the switch cabinet, and the drive assembly drives the ultrasonic sensors to move along one end of the air pressure chamber to the other end, and the paths of adjacent ultrasonic sensors are not parallel to each other when they are displaced.

[0008] It can be seen that when a partial discharge signal is generated inside an electrical equipment such as a switch cabinet, the ultrasonic sensor calculates the spatial position of the discharge point by analyzing the time difference between the signal reaching different sensors. When the discharge point is near the symmetry plane of the two sets of sensors, the time between the signal reaching the two sets of sensors is very close or even the same. At this time, the spatial position of the discharge point cannot be accurately known, and sometimes only a short discharge or intermittent discharge will occur. Failure to locate and repair the discharge point in time may easily lead to safety hazards. The driving component drives the two sets of ultrasonic sensors to generate two preset non-parallel displacements in the installation shell, thereby causing the symmetry plane between the two sets of sensors to change, and the distance from the discharge position to change in different directions. After the displacement of the two sets of ultrasonic sensors, the time difference of the ultrasonic signal is recalculated to accurately obtain the spatial position of the discharge point.

[0009] Preferably, the ultrasonic sensors are evenly arranged in vertical rows on the front, back, side and top of the switch cabinet, and the paths of adjacent ultrasonic sensors in each row are non-parallel when they are displaced by the driving assembly.

[0010] In the above scheme, ultrasonic sensors are evenly distributed on the surface of the switch cabinet in the form of several groups of vertical columns, so as to carry out all-round monitoring of electrical equipment such as the switch cabinet. The preset displacement routes between adjacent ultrasonic sensors in each column are not parallel to each other. When the discharge point occurs between two adjacent groups of ultrasonic sensors in each column, the discharge point can be accurately located by driving the ultrasonic sensor to move through the driving component.

[0011] Preferably, the ultrasonic sensor includes a main sensor and a secondary sensor, and the main sensor and the secondary sensor are perpendicular to each other when displaced by the driving component. The main sensors and the secondary sensors in each column of the ultrasonic sensors are staggered, and the main sensors and the secondary sensors between adjacent vertical columns of the ultrasonic sensors are staggered.

[0012] In the above scheme, the displacement routes of two adjacent groups of ultrasonic sensors in each column can be divided into the displacement routes of the main sensor and the secondary sensor. The routes between the main sensor and the secondary sensor are perpendicular and staggered when driven to move by the driving component, and the sensors in adjacent vertical columns are also staggered by the main sensor and the secondary sensor. Therefore, no matter when a discharge point is generated between the symmetric planes of any two adjacent groups of ultrasonic sensors, the symmetric plane between the two groups of ultrasonic sensors can be changed to the greatest extent, thereby making it more convenient to calculate and locate the position of the discharge point by the displaced ultrasonic sensor.

[0013] Preferably, the driving assembly includes electromagnetic coils symmetrically arranged at both ends of the mounting shell, and a permanent magnet connected to the outer wall of the ultrasonic sensor.

[0014] In the above scheme, the electromagnetic coils are installed at both ends of the axial direction of the mounting shell and are installed inside the shell wall of the mounting shell, and corresponding permanent magnets are set. When the electromagnetic coils are energized, they attract the permanent magnets through electromagnetic force. The permanent magnets drive the ultrasonic sensor to be tightly attached to one end of the inner cavity of the mounting shell, thereby driving the ultrasonic sensor to displace along the axial direction of the mounting shell inside the mounting shell, so that the ultrasonic sensor can perform further measurement and positioning after the displacement.

[0015] Preferably, a plurality of groups of air flow grooves are provided on the end surface of the ultrasonic sensor close to the pressure regulating plate, the air flow grooves are connected to the air pressure chambers on both sides of the ultrasonic sensor, and an air collecting groove is provided in the middle of the air flow grooves.

[0016] In the above scheme, there is a certain degree of air pressure in the air pressure chamber. When the ultrasonic sensor is displaced by the driving assembly, the air flow will flow through the air flow groove and displace along one end of the air pressure chamber to the other end, and maintain the stability of the ultrasonic sensor during displacement. After the ultrasonic sensor is displaced, the gas at the air collecting groove in the middle of its displacement will generate air pressure on the middle of the ultrasonic sensor. The gas gathered in the air collecting groove generates air pressure on the middle of the ultrasonic sensor, so that the ultrasonic sensor can be tightly attached to the surface of the switch cabinet, and generates resistance to the tilt of the ultrasonic sensor, thereby ensuring that the ultrasonic sensor is more perpendicular to the surface of the switch cabinet and tightly attached to the switch cabinet, thereby increasing the measurement accuracy of the ultrasonic sensor and ensuring the stability of the connection between the ultrasonic sensor and the switch cabinet.

[0017] Preferably, the depth of the air collecting groove is greater than the depth at both ends of the air flow groove, and the air flow groove forms a slope with gradually increasing depth along the end position of the ultrasonic sensor to the air collecting groove position, and the width of the air flow groove gradually decreases along the end position of the ultrasonic sensor to the air collecting groove position.

[0018] In the above scheme, the depth of the gas collecting groove is greater than the depth of the air flow grooves on both sides, so that the gas in the gas collecting groove in the middle of the ultrasonic sensor is greater than the gas at the air flow groove, so that the air pressure on the ultrasonic sensor is more concentrated in the middle, thereby further promoting the monitoring stability of the ultrasonic sensor, and through the air flow groove along the slope with gradually increasing depth from the end position of the ultrasonic sensor to the gas collecting groove position, it is ensured that the gas remains relatively concentrated in the gas collecting groove when the ultrasonic sensor is displaced by the driving assembly, so that the ultrasonic sensor is subjected to greater resistance when it tends to tilt, and the stability of the ultrasonic sensor during displacement is guaranteed.

[0019] Preferably, the stabilizing assembly includes a sliding block and an adjusting spring with two ends respectively connected to the sliding block and the pressure regulating plate.

[0020] Preferably, the stabilizing assembly further comprises a sliding rod slidably connected to the sliding block, the sliding block is provided with a wedge-shaped surface on a side close to the ultrasonic sensor, and the permanent magnet is formed into an arc-shaped surface on a side close to the sliding block.

[0021] In the above scheme, when the driving component drives the ultrasonic sensor to displace, it will first cause the permanent magnet at one end to lose contact with the sliding block at the corresponding end. At this time, both sets of sliding blocks are not squeezed by external force, and the air in the air pressure chamber will squeeze the adjustment plate, causing the adjustment plate to produce a short-distance displacement toward the adjustment chamber. At this time, the ultrasonic sensor reduces the preload and friction with the surface of the switch cabinet, thereby making it easier for the ultrasonic sensor to move to the other end. After the displacement is completed, the permanent magnet continues to squeeze the wedge surface of the sliding block at the other end, thereby driving the sliding block and the adjustment spring to restore the adjustment plate. At this time, the adjustment plate will squeeze the ultrasonic sensor again, increasing the close contact between the ultrasonic sensor and the surface of the switch cabinet, thereby ensuring the accuracy of ultrasonic signal monitoring.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. When a discharge point occurs near the symmetric plane of the two sets of sensors, the driving component drives the two sets of ultrasonic sensors to generate two preset non-parallel displacements in the installation shell, thereby causing the symmetric plane between the two sets of sensors to change, and the distance from the discharge position to change in different directions. After the sensor is displaced, the signal of the discharge point is recalculated and positioned to achieve the effect of accurately locating the discharge point that cannot be accurately located. In addition, the driving component can be used to displace the ultrasonic sensor after it cannot accurately measure, thereby quickly performing secondary positioning, thereby preventing the discharge signal from being temporarily unable to be accurately positioned and causing safety hazards.

[0024] 2. The present invention arranges the distribution of ultrasonic sensors so that when a discharge point occurs near the symmetry plane of two groups of sensors, the two adjacent groups of ultrasonic sensors are displaced perpendicularly to each other through the driving assembly. By staggering the primary sensors and secondary sensors in vertical columns, and staggering each group of adjacent vertical columns, the problem of a discharge point that cannot be accurately located and still cannot be accurately located after secondary positioning is avoided as much as possible. The primary sensor and the secondary sensor change the symmetry plane between them when they move perpendicularly to each other, thereby making it easier to compare with the initial positioning data, realize rapid measurement and positioning of the discharge point, and further accurately locate the position of the discharge point.

[0025] 3. The present invention sets an air pressure cavity so that the ultrasonic sensor is affected by the air flow groove and the air collecting groove, which produces resistance to the tilt of the ultrasonic sensor, so that the ultrasonic sensor is vertically close to the surface of the switch cabinet when in the signal receiving state, thereby improving the accuracy of the ultrasonic sensor receiving signals. When the ultrasonic sensor is driven to move by the driving component, the stabilizing component loses the limit of the permanent magnet. At this time, the adjustment plate will move toward the adjustment cavity, so that the ultrasonic sensor reduces the pressure on the switch cabinet surface and reduces the friction with the switch cabinet surface, so that it can move more stably to the other end of the mounting shell for secondary positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the real-time monitoring and positioning device for partial discharge of power equipment;

[0027] Figure 2 This is a side view of the overall structure of the real-time monitoring and positioning device for partial discharge of power equipment;

[0028] Figure 3 This is a front view of the overall structure of the real-time monitoring and positioning device for partial discharge of power equipment;

[0029] Figure 4 Real-time monitoring and positioning device for partial discharge of power equipment Figure 3 A in the middle is an enlarged schematic diagram;

[0030] Figure 5 This is a schematic diagram of the movement status of the ultrasonic sensor of the real-time monitoring and positioning device for partial discharge of power equipment;

[0031] Figure 6 This is a side view of the internal structure of the installation shell of the real-time monitoring and positioning device for partial discharge of power equipment;

[0032] Figure 7 Schematic diagram of the ultrasonic sensor structure of the real-time monitoring and positioning device for partial discharge of power equipment;

[0033] Figure 8 This is a flow chart of the ultrasonic sensor movement process of the real-time monitoring and positioning device for partial discharge of power equipment.

[0034] In the figure: 1. Ultrasonic sensor; 2. Mounting shell; 3. Magnetic base; 4. Driving assembly; 5. Stabilizing assembly; 11. Main sensor; 12. Secondary sensor; 13. Air flow slot; 131. Air collecting slot; 132. Slope; 21. Air pressure chamber; 22. Adjusting chamber; 23. Micro air pump; 24. Pressure regulating plate; 41. Electromagnetic coil; 42. Permanent magnet; 51. Sliding block; 511. Wedge surface; 52. Adjusting spring; 53. Sliding rod. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may obtain other implementation methods without violating the connotation of the present invention and without expending creative work. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] See also Figures 1 to 8 , the present invention provides the following technical solutions:

[0038] As an embodiment of the present invention, refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4, including an ultrasonic sensor 1, a mounting shell 2, a magnetic base 3, a driving component 4 and a stabilizing component 5; the inner cavity of the mounting shell 2 is provided with an air pressure chamber 21 and an adjusting chamber 22, the air pressure chamber 21 is connected to a micro air pump 23, and a pressure regulating plate 24 is provided between the air pressure chamber 21 and the adjusting chamber 22; the ultrasonic sensor 1 is arranged in the air pressure chamber 21 and is located at the end of the air pressure chamber 21; the magnetic base 3 is connected to the mounting shell 2, and the mounting shell 2 is mounted on the surface of the switch cabinet through the magnetic base 3; the driving component 4 is arranged at both axial ends of the mounting shell 2, and the stabilizing component 5 is arranged in the air pressure chamber 21 and is connected to the pressure regulating plate 24; the ultrasonic sensors 1 are evenly distributed on the surface of the switch cabinet, and the driving component 4 drives the ultrasonic sensors 1 to move from one end of the air pressure chamber 21 to the other end. When adjacent ultrasonic sensors 1 move, the routes are not parallel to each other. Through the ultrasonic sensor 1, the mounting shell 2, the driving component 4 and the stabilizing component 5, the ultrasonic sensors 1 can be evenly distributed and accurately displaced on the surface of the switch cabinet, thereby improving the positioning accuracy of the partial discharge point and avoiding the positioning error caused by the fixed position of the sensor.

[0039] As an embodiment of the present invention, refer to Figure 1 、 Figure 2 and Figure 3 The ultrasonic sensors 1 are evenly arranged in vertical rows on the front, back, sides and top of the switch cabinet. The displacement routes of adjacent ultrasonic sensors 1 in each row are not parallel to each other when they are displaced by the driving component 4. In the above scheme, the ultrasonic sensors 1 are evenly distributed on the surface of the switch cabinet in the form of several groups of vertical rows, so as to perform all-round monitoring of electrical equipment such as the switch cabinet. The preset displacement routes between adjacent ultrasonic sensors 1 in each row are not parallel to each other. When a discharge point is generated between two adjacent groups of ultrasonic sensors 1 in each row, the discharge point can be accurately located after the ultrasonic sensor 1 is driven to displace by the driving component 4. In this embodiment, the ultrasonic sensors 1 can be equidistantly arranged along the surface of the switch cabinet to further improve the uniformity of monitoring and the accuracy of positioning.

[0040] As an embodiment of the present invention, refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5The ultrasonic sensor 1 includes a main sensor 11 and a secondary sensor 12. The main sensor 11 and the secondary sensor 12 are perpendicular to each other when displaced by the driving component 4. The main sensors 11 and the secondary sensors 12 in each column of ultrasonic sensors 1 are staggered, and the main sensors 11 and the secondary sensors 12 are staggered between adjacent vertical columns of ultrasonic sensors 1; the displacement routes of two adjacent groups of ultrasonic sensors 1 in each column can be divided into the displacement routes of the main sensor 11 and the secondary sensor 12. The routes between the main sensor 11 and the secondary sensor 12 are perpendicular and staggered when driven to move by the driving component 4, and the sensors in adjacent vertical columns are also staggered by the main sensor 11 and the secondary sensor 12. Therefore, no matter when a discharge point is generated between the symmetric planes of any two adjacent groups of ultrasonic sensors 1, the symmetric plane between the two groups of ultrasonic sensors 1 can be changed to the maximum extent, thereby making it more convenient to calculate and locate the position of the discharge point by the displaced ultrasonic sensor 1.

[0041] It should be noted that the distribution of the ultrasonic sensors 1 of the present invention is not unique and can be adaptively adjusted according to the actual size of the switch cabinet and the actual measurement range of the ultrasonic sensors 1. Multiple vertical columns or a single vertical column can be set on the front, back, side and top of the switch cabinet.

[0042] As an embodiment of the present invention, refer to Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 and Figure 8 The driving component 4 includes electromagnetic coils 41 symmetrically arranged at both ends of the mounting shell 2, and permanent magnets 42 connected to the outer wall of the ultrasonic sensor 1; in the above scheme, the electromagnetic coils 41 are installed at both ends of the mounting shell 2 in the axial direction, installed in the shell wall of the mounting shell 2, and the corresponding permanent magnets 42 are installed. When the electromagnetic coils 41 are energized, the electromagnetic force attracts the permanent magnets 42, and the permanent magnets 42 drive the ultrasonic sensor 1 to be tightly attached to one end of the inner cavity of the mounting shell 2, thereby driving the ultrasonic sensor 1 to displace along the axial direction of the mounting shell 2 inside the mounting shell 2, so that the ultrasonic sensor 1 can perform further measurement and positioning after the displacement.

[0043] As an embodiment of the present invention, refer to Figure 3 、 Figure 4 and Figure 7, a plurality of groups of air flow grooves 13 are provided on the end face of the ultrasonic sensor 1 close to the pressure regulating plate 24, and the air flow grooves 13 are connected to the air pressure chambers 21 on both sides of the ultrasonic sensor 1, and an air collecting groove 131 is provided in the middle of the air flow grooves 13; there is a certain degree of air pressure in the air pressure chamber 21, and when the ultrasonic sensor 1 is displaced by the driving component 4, air will flow through the air flow grooves 13 and displace from one end of the air pressure chamber 21 to the other end, and maintain the stability of the ultrasonic sensor 1 during displacement, and after the ultrasonic sensor 1 is displaced, the gas at the air collecting groove 131 in the middle of the displacement will generate air pressure in the middle of the ultrasonic sensor 1, and the gas gathered in the air collecting groove 131 generates air pressure in the middle of the ultrasonic sensor 1 through the air pressure generated in the middle of the ultrasonic sensor 1, so that the ultrasonic sensor 1 can be closely attached to the surface of the switch cabinet, and generates resistance to the tilt of the ultrasonic sensor 1, thereby ensuring that the ultrasonic sensor 1 is more perpendicular to the surface of the switch cabinet and closely attached to the switch cabinet, thereby increasing the measurement accuracy of the ultrasonic sensor 1 and ensuring the stability of the connection between the ultrasonic sensor 1 and the switch cabinet.

[0044] As an embodiment of the present invention, refer to Figure 3 、 Figure 4 and Figure 7 The depth of the gas collecting groove 131 is greater than the depth of the two ends of the air flow groove 13, and the air flow groove 13 forms a slope 132 with a gradually increasing depth along the end position of the ultrasonic sensor 1 to the position of the gas collecting groove 131, and the width of the air flow groove 13 gradually decreases along the end position of the ultrasonic sensor 1 to the position of the gas collecting groove 131; the depth of the gas collecting groove 131 is greater than the depth of the air flow grooves 13 on both sides, so that the gas in the gas collecting groove 131 in the middle of the ultrasonic sensor 1 is more than the gas at the air flow groove 13, so that the air pressure on the ultrasonic sensor 1 is more concentrated in the middle, thereby further promoting the monitoring stability of the ultrasonic sensor 1, and through the slope 132 with a gradually increasing depth along the end position of the ultrasonic sensor 1 to the position of the gas collecting groove 131 of the air flow groove 13, and ensuring that the gas remains relatively concentrated in the gas collecting groove 131 when the ultrasonic sensor 1 is displaced by the driving component 4, the ultrasonic sensor 1 is subjected to greater resistance when a tilted movement tendency occurs, and the stability of the ultrasonic sensor 1 during displacement is guaranteed.

[0045] It should be noted that the connection line between the ultrasonic sensor 1 located in the mounting housing 2 and the outside is provided with displacement redundancy, and the connection with the mounting housing 2 is sealed using conventional technology.

[0046] As an embodiment of the present invention, refer to Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 and Figure 8The stabilizing component 5 includes a sliding block 51, an adjusting spring 52 connected to the sliding block 51 and the pressure regulating plate 24 at both ends; the stabilizing component 5 also includes a sliding rod 53 slidably connected to the sliding block 51, the sliding block 51 is provided with a wedge surface 511 on the side close to the ultrasonic sensor 1, the permanent magnet 42 is an arc-shaped surface on the side close to the sliding block 51, and the sliding rod 53 is connected to the side of the pressure regulating plate 24 close to the air pressure chamber 21; when the driving component 4 drives the ultrasonic sensor 1 to move, it will first cause the permanent magnet 42 at one end to lose contact with the sliding block 51 at the corresponding end. At this time, the two sets of sliding blocks 51 are not squeezed by external force, and the air pressure chamber The air in 21 will squeeze the pressure regulating plate 24, causing the pressure regulating plate 24 to move a short distance toward the regulating chamber 22. At this time, the ultrasonic sensor 1 reduces the preload and friction with the surface of the switch cabinet, making it easier for the ultrasonic sensor 1 to move to the other end. After the displacement is completed, the permanent magnet 42 continues to squeeze the wedge surface 511 of the sliding block 51 at the other end, thereby driving the sliding block 51 and the adjusting spring 52 to restore the pressure regulating plate 24. At this time, the pressure regulating plate 24 will squeeze the ultrasonic sensor 1 again, increasing the close contact between the ultrasonic sensor 1 and the surface of the switch cabinet, thereby ensuring the accuracy of ultrasonic signal monitoring.

[0047] It should be noted that there is a reserved space in the axial direction of the mounting housing 2 for the ultrasonic sensor 1 to move toward the electromagnetic coils 41 at both ends. The two surfaces of the mounting housing 2 without the electromagnetic coils 41 are in sliding contact with the surface of the ultrasonic sensor 1.

[0048] Working principle: When a discharge point appears near the symmetry plane of two adjacent groups of ultrasonic sensors 1, the time difference between the two groups of ultrasonic sensors 1 and the discharge point is relatively close, and the position of the discharge point cannot be accurately measured and located. At this time, the driving component 4 is started to drive the ultrasonic sensor 1 to move, so that the ultrasonic sensor 1 is displaced along the axial direction of the mounting shell 2 in the mounting shell 2, thereby changing the position of the symmetry plane between the two adjacent groups of ultrasonic sensors 1, and the position from the discharge point will produce different displacement changes. The displaced ultrasonic sensor 1 receives the discharge signal again and calculates the time difference, and compares and measures it with the first signal, thereby determining the precise spatial position of the discharge point through secondary positioning.

[0049] Specifically, refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 5First, the mounting housing 2 is mounted on the surface of the switch cabinet through the magnetic base 3. At this time, the ultrasonic sensors 1 located in the mounting housing 2 are evenly distributed on all surfaces of the switch cabinet to form an all-round monitoring network. At this time, the main sensors 11 and the secondary sensors 12 are staggered and evenly arranged in a vertical column, and each group of ultrasonic sensors 1 adjacent to each other on the front, back and side also maintains the staggered distribution of the main sensors 11 and the secondary sensors 12. This ensures that when a discharge point that is difficult to accurately measure occurs, the two groups of ultrasonic sensors 1 closest to the discharge point are the main sensors 11 and the secondary sensors 12. The installation angles of the mounting housings 2 corresponding to the main sensors 11 and the secondary sensors 12 are perpendicular to each other. That is, when the main sensors 11 and the secondary sensors 12 are displaced in the mounting housing 2 by the driving component 4, the displacement paths are also perpendicular to each other. Therefore, a small displacement allows the main sensors 11 and the secondary sensors 12 to be as close to the discharge point as possible, resulting in a large time difference.

[0050] It should be noted that the ultrasonic sensors 1 should maintain a certain redundancy in their measurement ranges to ensure that each group of ultrasonic sensors 1 can perform all-round monitoring of the switch cabinet in the initial installation position and after displacement.

[0051] Reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 When local discharge occurs, the ultrasonic sensor 1 receives the discharge signal and performs simple algorithm control on the monitoring process through existing technology. When the time difference between the discharge point and two or more groups of ultrasonic sensors 1 is less than the requirement for accurate measurement and positioning, the transmission signal controls the drive component 4 to start. The electromagnetic coil 41 in the drive component 4 is energized to generate electromagnetic force. At this time, the electromagnetic force attracts the permanent magnet 42 connected to the ultrasonic sensor 1, driving the ultrasonic sensor 1 to displace axially in the mounting housing 2. After the displacement, the ultrasonic sensor 1 re-measures the arrival time difference of the discharge signal, and accurately locates the position of the discharge point through data processing and calculation and comparison with the first signal data.

[0052] It should be noted that the control method of the drive component 4 can realize intelligent processing through the preset algorithm and signal transmission and receiving module of the existing technology, so that the ultrasonic sensor 1 has an intelligent processing function, and is realized by combining an intelligent sensor with the ultrasonic sensor 1, and each group of ultrasonic sensors 1 has two sets of fixed measurement positions in the installation shell 2, and the ultrasonic sensor 1 will remain in the two sets of fixed measurement positions before and after displacement.

[0053] Reference Figure 6 、 Figure 7 and Figure 8During the displacement of the ultrasonic sensor 1, the sliding block 51 and the adjusting spring 52 in the stabilizing assembly 5 cooperate. First, the electromagnetic coil 41 energized in the mounting housing 2 will be transformed from the originally unenergized electromagnetic coil 41 to the energized state, and the originally energized electromagnetic coil 41 will be turned to the de-energized state. At this time, the ultrasonic sensor 1 is displaced toward the electromagnetic coil 41 at the energized end through the permanent magnet 42 connected to it. The ultrasonic sensor 1 will lose the squeezing of the sliding block 51 on the side of the de-energized electromagnetic coil 41 through the permanent magnet 42. At this time, the pressure regulating plate 24 will be squeezed and displaced toward the regulating cavity 22 under the action of the air pressure in the air pressure cavity 21. At this time, the ultrasonic sensor 1 will reduce the air pressure effect on itself and the pressure of the pressure regulating plate 24 toward the switch cabinet, thereby moving more smoothly from one end of the mounting housing 2 to the other end. After the ultrasonic sensor 1 has completed its displacement, the permanent magnet 42 will re-squeeze the wedge surface 511 on the sliding block 51, limit the sliding block 51, and make the sliding block 51 move toward the switch cabinet along the sliding rod 53. At the same time, the sliding block 51 will drive the adjusting spring 52 and the pressure regulating plate 24 connected to the adjusting spring 52 to move toward the ultrasonic sensor 1, and under the elastic force of the adjusting spring 52, the pressure regulating plate 24 will give the ultrasonic sensor 1 pressure in the direction of the switch cabinet. At this time, the airflow of the ultrasonic sensor 1 close to the pressure regulating plate 24 will be concentrated in the air collecting groove 131. Under the action of the air pressure of the air collecting groove 131 located in the middle of the ultrasonic sensor 1 and the pressure regulating plate 24, the ultrasonic sensor 1 is close to the surface of the switch cabinet and perpendicular to the surface of the switch cabinet, thereby ensuring the accuracy and stability of the monitoring signal of the ultrasonic sensor 1.

[0054] The above embodiments are only used to illustrate some examples of the implementation of the technical solution of the present invention and are not intended to limit the implementation methods. The present invention can be understood in more detail with reference to the embodiments. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A real-time monitoring and positioning device for partial discharge of power equipment, characterized by: The invention comprises an ultrasonic sensor (1), a mounting shell (2), a magnetic base (3), a driving component (4) and a stabilizing component (5); the inner cavity of the mounting shell (2) is provided with an air pressure chamber (21) and an adjusting chamber (22); the air pressure chamber (21) is connected to a micro air pump (23); a pressure regulating plate (24) is provided between the air pressure chamber (21) and the adjusting chamber (22); the ultrasonic sensor (1) is provided in the air pressure chamber (21) and is located at the end of the air pressure chamber (21); the magnetic base (3) is connected to the mounting shell (2) and the driving component (4) and the stabilizing component (5); the driving component (4) and the stabilizing component (5) are connected to the magnetic base (3) and the mounting shell (2); ... The mounting housing (2) is connected to the switch cabinet, and the mounting housing (2) is mounted on the surface of the switch cabinet through a magnetic base (3); the driving assembly (4) is arranged at both axial ends of the mounting housing (2), and the stabilizing assembly (5) is arranged in the air pressure cavity (21) and connected to the pressure regulating plate (24); the ultrasonic sensors (1) are evenly distributed on the surface of the switch cabinet, and the driving assembly (4) drives the ultrasonic sensors (1) to move along one end of the air pressure cavity (21) to the other end, and the paths of adjacent ultrasonic sensors (1) are not parallel to each other when they move.

2. The device for real-time monitoring and locating partial discharge of power equipment according to claim 1, characterized in that: The ultrasonic sensors (1) are evenly arranged in vertical rows on the front, back, side and top surfaces of the switch cabinet, and the paths of adjacent ultrasonic sensors (1) in each row are non-parallel when displaced by the driving assembly (4).

3. The real-time monitoring and positioning device for partial discharge of power equipment according to claim 2, characterized in that: The ultrasonic sensor (1) comprises a main sensor (11) and a secondary sensor (12). The main sensor (11) and the secondary sensor (12) are perpendicular to each other when displaced by the driving component (4). The main sensors (11) and the secondary sensors (12) in each column of the ultrasonic sensors (1) are staggered, and the main sensors (11) and the secondary sensors (12) between adjacent vertical columns of the ultrasonic sensors (1) are staggered.

4. The real-time monitoring and positioning device for partial discharge of power equipment according to claim 1 or 2, characterized in that: The driving assembly (4) comprises electromagnetic coils (41) symmetrically arranged at both ends of the mounting housing (2), and a permanent magnet (42) connected to the outer wall of the ultrasonic sensor (1).

5. The real-time monitoring and positioning device for partial discharge of electric power equipment according to claim 1 or 2, characterized in that: A plurality of groups of airflow grooves (13) are provided on the end surface of the ultrasonic sensor (1) close to the pressure regulating plate (24), the airflow grooves (13) are connected to the air pressure chambers (21) on both sides of the ultrasonic sensor (1), and an air collecting groove (131) is provided in the middle of the airflow grooves (13).

6. The device for real-time monitoring and locating partial discharge of power equipment according to claim 5, characterized in that: The depth of the gas collecting groove (131) is greater than the depth of both ends of the air flow groove (13); the air flow groove (13) forms a slope (132) with a gradually increasing depth along the end position of the ultrasonic sensor (1) to the position of the gas collecting groove (131); and the width of the air flow groove (13) gradually decreases along the end position of the ultrasonic sensor (1) to the position of the gas collecting groove (131).

7. The device for real-time monitoring and locating partial discharge of power equipment according to claim 4, characterized in that: The stabilizing assembly (5) comprises a sliding block (51) and an adjusting spring (52) with two ends respectively connected to the sliding block (51) and the pressure regulating plate (24).

8. The device for real-time monitoring and locating partial discharge of power equipment according to claim 7, characterized in that: The stabilizing assembly (5) further comprises a sliding rod (53) slidably connected to the sliding block (51); a wedge-shaped surface (511) is provided on a side of the sliding block (51) close to the ultrasonic sensor (1); and a side of the permanent magnet (42) close to the sliding block (51) is an arc-shaped surface.

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