A device for detecting voltage and corona discharge in ultra-high voltage AC lines.

Abstract

This utility model relates to the field of ultra-high voltage AC line voltage detection technology, specifically, to an ultra-high voltage AC line voltage and corona discharge detection device; it includes a drone, a metal induction plate, a shielding box, a detection circuit, and a signal acquisition device. The drone lifts the metal induction plate, detection circuit, shielding box, and signal acquisition device to the vicinity of the ultra-high voltage line to be tested. The signal acquisition device acquires the signal waveform, and the space charge characteristics of the corona discharge of the transmission line are determined based on the signal waveform, so as to more accurately determine the induced charge on the surface of the induction plate. The device is simple to operate, has low requirements for instrument parameters, and is low in cost, making it suitable for line inspection.

Description

Technical Field

[0001] This utility model relates to the field of ultra-high voltage AC line voltage detection technology, specifically, to an ultra-high voltage AC line voltage and corona discharge detection device. Background Technology

[0002] When ultra-high voltage (UHV) transmission lines are energized, a phenomenon resembling corona discharge or surface discharge current noise is commonly observed on some towers, especially tension towers. During continuous corona discharge, the discharge consumes energy, causing energy loss in the transmission line. Simultaneously, the discharge triggers ionization chemical reactions in the surrounding air, generating ozone and nitrogen oxides, which may corrode the transmission line conductors and insulation, reducing their lifespan. Secondly, corona discharge generates high-frequency electromagnetic pulses. Since these pulses occur in the radio wave band, they can interfere with radio communication and other signal transmissions, affecting the operation of related monitoring equipment. Furthermore, under AC voltage, the charged particles generated by corona discharge move near the metal conductor, forming an air jet (ion wind), and the resulting ozone and other harmful substances may pose a health hazard.

[0003] Therefore, it is necessary to measure the corona discharge of UHV transmission lines, analyze the corona discharge characteristics of UHV transmission lines in conjunction with the UHV transmission line voltage, obtain the corona discharge voltage, and propose line structure optimization design schemes or maintenance strategies accordingly.

[0004] Existing methods for measuring corona discharge in transmission lines are limited by the small changes in spatial field strength caused by continuous corona discharge. When the electrode distance is far, it is difficult to measure using the pulse current method, which is traditional for partial discharge measurement. Currently, most methods for detecting corona discharge in transmission lines are audible noise, ultraviolet detection, infrared detection, and ultrasonic detection. However, these methods can only roughly determine the intensity of the discharge, but it is difficult to conduct a more accurate study of the discharge quantity on the surface of the insulator or at the connection point.

[0005] The audible noise detection method relies on the hissing sound emitted during discharge during manual line inspections to determine whether corona discharge is present. It can only determine the presence of partial discharge when the discharge is strong and there is no interference, and cannot accurately determine the degree and characteristics of the discharge.

[0006] Infrared detection is based on the photoelectric principle to detect the thermal radiation signal during corona discharge and convert the signal into a visual image. However, its sensitivity is poor, and it cannot detect corona discharge through thermal imaging when the circuit is overloaded or faulty.

[0007] Ultraviolet detection can determine whether there is continuous corona discharge by quantifying the number of photons, but the accuracy of the measurement depends on the precision of the special instrument, is expensive, and the accuracy is affected by the measurement distance, resulting in a large error in the measured continuous corona discharge voltage. Figure 1This is a schematic diagram of the ultraviolet (UV) detection method, consisting of a lens system, a filter, a light sensor, a control and analysis system, and an image display system. The visible light lens captures a visible image of the corona target. The filter blocks light waves outside the solar blind zone. The UV lens performs UV imaging on the filtered-out light waves. The light sensor performs photoelectric conversion on the corona image. The control and analysis system analyzes the light intensity and controls the entire detection system. The image display system fuses and displays the two types of image information. Analysis of the mixed imaging information determines the specific discharge condition of the target.

[0008] Ultrasonic testing detects partial discharge through three parts: acoustic-to-electrical signal conversion, electrical signal amplification, and signal display. However, ultrasonic testing is susceptible to electromagnetic interference, has low sensitivity, and cannot perform quantitative analysis and detection.

[0009] In summary, existing methods for detecting corona discharge are insufficient to determine the intensity of the corona discharge or to obtain accurate continuous corona discharge voltages. Furthermore, they cannot analyze the situation of charged particles in space. Utility Model Content

[0010] This invention addresses the shortcomings of existing corona discharge detection methods, which struggle to determine the intensity of corona discharge, obtain accurate continuous corona discharge voltage, and analyze charged particles in space. It proposes a device for detecting voltage and corona discharge in ultra-high voltage (UHV) AC lines. The device comprises a drone, a metal induction plate, a shielding box, a detection circuit, and a signal acquisition device. The drone lifts the metal induction plate, detection circuit, shielding box, and signal acquisition device to the vicinity of the UHV line under test. The signal acquisition device collects the signal waveform, and the space charge characteristics of the corona discharge in the transmission line are determined based on the waveform, leading to a more accurate determination of the induced charge on the surface of the induction plate. The device is simple to operate, requires minimal instrument parameters, and is low in cost, making it suitable for line inspection.

[0011] The specific implementation details of this utility model are as follows: A device for detecting voltage and corona discharge of ultra-high voltage AC lines includes a drone, a metal induction plate, a shielding box, a detection circuit, and a signal acquisition device. The drone is positioned above the metal sensor plate and is fixedly connected to the metal sensor plate; The shielding box is located below the metal induction plate and is fixedly connected to the metal plate; The detection circuit and signal acquisition device are housed inside the shielding box. One end of the detection circuit is connected to the metal induction plate, and the other end is connected to the signal acquisition device. The signal acquisition device acquires the signal waveform and determines the space charge characteristics of the corona discharge of the transmission line based on the signal waveform.

[0012] To better realize this utility model, the metal induction plate is further provided with drone rotor holes; The rotor blades of the UAV are disposed within the rotor aperture of the UAV, and the diameter of the rotor aperture is larger than the diameter of the rotor blades of the UAV.

[0013] To better realize this utility model, the shielding box further includes an upper cover plate and a lower cover plate; The upper cover plate is provided with a first bolt hole, through which it is connected to the metal induction plate; The lower cover plate is provided with a second bolt hole, through which the detection circuit is fixedly installed in the shielding box.

[0014] To better realize this utility model, a cable hole is further provided on the lower cover plate; The cable hole is located at the center of the lower cover plate, and the detection circuit is connected to the signal acquisition device through the cable hole.

[0015] To better realize this utility model, the shielding box further includes a front cover plate and a rear cover plate; The front cover plate is provided with a third bolt hole, the front end of the upper cover plate is provided with a fifth bolt hole, and the front end of the lower cover plate is provided with a sixth bolt hole. The front cover plate is connected to the fifth and sixth bolt holes via the third bolt hole; The rear cover plate is provided with a fourth bolt hole, the rear end of the upper cover plate is provided with a seventh bolt hole, and the front end of the lower cover plate is provided with an eighth bolt hole. The rear cover is connected to the seventh and eighth bolt holes via the fourth bolt hole.

[0016] To better realize this utility model, the detection circuit further includes capacitor C2, resistor R1, resistor R2, and resistor R3; One end of the resistor R2 is connected to the metal induction plate, and the other end is connected to the signal acquisition device via a cable; One end of the capacitor C2 is connected between the metal induction plate and the resistor R2, and the other end is connected between the resistors R1 and R3. One end of the resistor R3 is connected between the resistor R1 and the capacitor C2, and the other end is connected to the signal acquisition device through a cable. One end of the resistor R1 is connected between the capacitor C2 and the resistor R3, and the other end is connected to the ground terminal of the signal acquisition device through a cable.

[0017] To better realize this utility model, the drone is further described as a hovering drone.

[0018] To better realize this utility model, the metal sensing plate is further described as an aluminum plate.

[0019] This utility model has the following beneficial effects: (1) This utility model acquires signal waveforms through a signal acquisition device, judges the space charge characteristics of corona discharge in transmission lines based on the signal waveforms, and evaluates the degree of corona discharge. The device is simple to operate, has low requirements for instrument parameters, and is low in cost, making it suitable for line inspection. It solves the problem that the existing more accurate measurement technology, ultraviolet imaging, relies on the precision and high cost of special instruments.

[0020] (2) This utility model proposes a structural method that combines the induction plate with the anti-collision protection structure of the UAV to solve the problem of the whole plate affecting the flight of the hovering UAV. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the existing ultraviolet detection method. Figure 2 This is a flowchart of the existing ultrasonic testing process.

[0022] Figure 3 This is the electrical structure diagram of a CVT.

[0023] Figure 4 This is a schematic diagram of a bushing end-frequency voltage sensor.

[0024] Figure 5 A schematic diagram of the structure of the ultra-high voltage AC line voltage and corona discharge detection device provided by this utility model.

[0025] Figure 6 This is a schematic diagram of the metal sensing plate and detection circuit structure.

[0026] Figure 7 The structural diagram of the shielding box provided by this utility model.

[0027] Figure 8 The circuit diagram of the detection device provided by this utility model.

[0028] Among them, 1. UAV, 2. Metal induction plate, 3. Shielding box, 31. Top cover plate, 32. Bottom cover plate, 33. Front cover plate, 34. Rear cover plate, 4. Detection circuit, 5. Signal acquisition device, 6. UAV rotor hole, 7. First bolt hole, 8. Second bolt hole, 9. Cable hole, 10. Third bolt hole, 11. Fourth bolt hole, 12. Fifth bolt hole, 13. Sixth bolt hole, 14. Seventh bolt hole, 15. Eighth bolt hole. Detailed Implementation

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of this utility model, not all embodiments, and therefore should not be regarded as a limitation on the scope of protection. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Example 1: A device for detecting voltage and corona discharge in ultra-high voltage AC lines, such as Figure 5 As shown, it includes a drone 1, a metal induction plate 2, a shielding box 3, a detection circuit 4, and a signal acquisition device 5; The drone 1 is positioned above the metal sensor plate 2 and is fixedly connected to the metal sensor plate 2; The shielding box 3 is disposed below the metal sensing plate 2 and is fixedly connected to the metal sensing plate 2; The detection circuit 4 and the signal acquisition device 5 are installed inside the shielding box 3. One end of the detection circuit 4 is connected to the metal induction plate 2, and the other end is connected to the signal acquisition device 5. The signal acquisition device 5 acquires the signal waveform and determines the space charge characteristics of the corona discharge of the transmission line based on the signal waveform.

[0032] Working Principle: The detection device in this embodiment consists of a drone 1, a metal induction plate 2, a detection circuit 4, a shielding box 3, a signal transmission cable, and a signal acquisition device 5. The drone 1 is a hovering drone with a payload of several kilograms. In this embodiment, the drone 1 lifts the metal induction plate 2, the detection circuit 4, the shielding box 3, and the signal acquisition device 5 to the vicinity of the UHV line to be tested. The signal acquisition device 5 acquires the signal waveform, and the space charge characteristics of the corona discharge of the transmission line are determined based on the signal waveform, thus more accurately determining the induced charge on the surface of the metal induction plate 2. The device is simple to operate, has low requirements for instrument parameters, and is low in cost, making it suitable for line inspection.

[0033] In this embodiment, the metal sensor plate 2 is combined with the anti-collision protection structure of the UAV 1 and forms part of the shielding structure. The shielding structure also serves to support the metal sensor plate 2 and provide shielding.

[0034] In the measuring device, the metal sensing plate 2 and the detection circuit 4 are passive sensing devices; the metal sensing plate 2 and the shielding shell are integrated, and a lightweight design is adopted while ensuring the effect. The shielding shell of the detection circuit 4 can ensure that the signal acquisition is not affected by electromagnetic field interference.

[0035] A drone (1) is used as the lifting device to raise and lower the metal induction plate (2) and detection circuit (4) below the power line. The distance from the UHV transmission line is greater than the air insulation breakdown distance, so it does not affect the line and ensures safe use. The device has a simple structure, low cost, short detection time, no need for complex signal processing, and is easy to operate and use.

[0036] Example 2: This embodiment is based on the above embodiment 1, such as... Figure 6 As shown, the structure of the metal sensing plate 2 is described with reference to a specific embodiment. The metal sensing plate 2 is provided with a drone rotor hole 6. The rotor blades of the UAV 1 are disposed within the rotor hole 6 of the UAV, and the diameter of the rotor hole 6 is larger than the diameter of the rotor blades of the UAV 1.

[0037] Working principle: This embodiment proposes a structural method that combines the metal sensing plate 2 with the anti-collision protection structure of the UAV 1 by setting the UAV rotor hole 6, thereby solving the problem that the entire metal sensing plate 2 affects the flight of the hovering UAV 1.

[0038] In this embodiment, the metal sensing plate 2 is an aluminum plate with a thickness of 1mm and a length and width of tens of cm. It serves as both a charge sensing function and a collision protection ring for the rotor blades of the UAV 1. The detection circuit 4 is placed below the metal sensing plate 2, meaning that the metal sensing plate 2 also serves as a protective cover for the circuit.

[0039] The other parts of this embodiment are the same as those in Embodiment 1 above, so they will not be described again.

[0040] Example 3: This embodiment is based on any one of Embodiments 1-2 above, such as Figure 7 As shown, the structure of the shielding box is described in detail with reference to a specific embodiment.

[0041] The shielding box 3 includes an upper cover plate 31 and a lower cover plate 32; The upper cover plate 31 is provided with a first bolt hole 7, which is connected to the metal induction plate 2 through the first bolt hole 7; The lower cover plate 32 is provided with a second bolt hole 8, through which the detection circuit 4 is fixedly installed in the shielding box 3.

[0042] The lower cover plate 32 is also provided with a cable hole 9; The cable hole 9 is located at the center of the lower cover plate 32, and the detection circuit 4 is connected to the signal acquisition device 5 through the cable hole 9.

[0043] The shielding box 3 also includes a front cover plate 33 and a rear cover plate 34; The front cover plate 33 is provided with a third bolt hole 10, the front end of the upper cover plate 31 is provided with a fifth bolt hole 12, and the front end of the lower cover plate 32 is provided with a sixth bolt hole 13. The front cover plate 33 is connected to the fifth bolt hole 12 and the sixth bolt hole 13 through the third bolt hole 10; The rear cover plate 34 is provided with a fourth bolt hole 11, the rear end of the upper cover plate 31 is provided with a seventh bolt hole 14, and the front end of the lower cover plate 32 is provided with an eighth bolt hole 15. The rear cover plate 34 is connected to the seventh bolt hole 14 and the eighth bolt hole 15 through the fourth bolt hole 11.

[0044] Working principle: In this embodiment, the shielding box 3 of the detection circuit 4 uses a highly conductive split aluminum shell as the shielding material, with a thickness of 1mm. The entire outer layer of the shielding box 3 is coated with an insulating material. The metal sensing plate 2 is placed on top of the shielding box 3, with the shielding box 3 serving as its support.

[0045] The front and back structures of the shielding box 3 are as follows Figure 7 As shown, the large holes on the front and back are the first screw holes 7 for fixing the shielding box 3 and the metal sensing plate 2 together. The four small holes on the back are the second screw holes 8 for fixing the circuit board of the detection circuit 4. The four small holes at the front and back are the screw holes for the sealing cover of the shielding box. Screws are used to fix the upper cover plate 31, the metal sensing plate 2, and the lower cover plate 32 together through the large holes on the front and back. Insulating studs are used to fix the detection circuit 4 in the middle of the shielding box 3. Finally, screws are used to fix the sealing cover to the bottom of the shielding box through the four small holes at the bottom, sealing the entire box.

[0046] The metal sensing plate 2 is connected to the detection circuit 4 through the first bolt hole 7 via a wire; the middle hole of the lower cover plate 32 is the coaxial cable outlet, i.e., the cable hole 9, to ensure that the circuit board transmits the signal to the signal acquisition device 5 through the coaxial cable after receiving the signal, and the front and rear are sealed by the cover plate.

[0047] The other parts of this embodiment are the same as any one of the above embodiments 1-2, so they will not be described again.

[0048] Example 4: This embodiment is based on any one of embodiments 1-3 above, such as Figure 8 As shown, the detection circuit 4 includes a capacitor C2, a resistor R1, a resistor R2, and a resistor R3; One end of the resistor R2 is connected to the metal induction plate 2, and the other end is connected to the signal acquisition device 5 via a cable. One end of the capacitor C2 is connected between the metal induction plate 2 and the resistor R2, and the other end is connected between the resistor R1 and the resistor R3. One end of the resistor R3 is connected between the resistor R1 and the capacitor C2, and the other end is connected to the signal acquisition device 5 via a cable. One end of the resistor R1 is connected between the capacitor C2 and the resistor R3, and the other end is connected to the ground terminal of the signal acquisition device 5 through a cable.

[0049] Working principle: In this embodiment, the detection circuit 4 is placed inside the shielding box 3, and the main body is a circuit composed of capacitors and matching resistors. The signal transmission line is a 3-core coaxial cable, which includes a ground wire, a first signal acquisition unit transmission line, and a second signal acquisition unit transmission line; the signal acquisition device 5 is a RIGOL high sampling rate oscilloscope, which can be replaced by other sampling devices.

[0050] During measurement, a drone 1 lifts the metal induction plate 2, detection circuit 4, shielding box 3, etc., to a horizontal distance of several meters near the ultra-high voltage line under test. When the line generates corona discharge, the signal acquisition device 5 can collect: the line voltage divider voltage + charge induced voltage U1, which is a low-frequency signal, collected at a sampling rate of 100Msa / s or higher; and the discharge pulse signal U2, which is a high-frequency signal, collected at a sampling rate of 1Gsa / s or higher. Based on the signal waveforms collected by the signal acquisition device 5 (such as on an oscilloscope), the corona discharge of the transmission line and the characteristics of space charge near the line are analyzed and judged.

[0051] The other parts of this embodiment are the same as any one of the embodiments 1-3 above, so they will not be described again.

[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A device for detecting voltage and corona discharge in ultra-high voltage AC lines, characterized in that, Includes a drone (1), a metal induction plate (2), a shielding box (3), a detection circuit (4), and a signal acquisition device (5); The drone (1) is positioned above the metal sensor plate (2) and is fixedly connected to the metal sensor plate (2); The shielding box (3) is located below the metal induction plate (2) and is fixedly connected to the metal induction plate (2); The detection circuit (4) and the signal acquisition device (5) are set inside the shielding box (3). One end of the detection circuit (4) is connected to the metal induction plate (2), and the other end is connected to the signal acquisition device (5). The signal acquisition device (5) acquires the signal waveform and judges the space charge characteristics of the corona discharge of the transmission line based on the signal waveform.

2. The ultra-high voltage AC line voltage and corona discharge detection device according to claim 1, characterized in that, The metal induction plate (2) is provided with a drone rotor hole (6). The rotor blades of the UAV (1) are disposed within the rotor hole (6) of the UAV, and the diameter of the rotor hole (6) of the UAV is greater than the diameter of the rotor blades of the UAV (1) during rotation.

3. The ultra-high voltage AC line voltage and corona discharge detection device according to claim 1, characterized in that, The shielding box (3) includes an upper cover plate (31) and a lower cover plate (32); The upper cover plate (31) is provided with a first bolt hole (7), which is connected to the metal induction plate (2) through the first bolt hole (7); The lower cover plate (32) is provided with a second bolt hole (8), through which the detection circuit (4) is fixedly installed in the shielding box (3).

4. The ultra-high voltage AC line voltage and corona discharge detection device according to claim 3, characterized in that, The lower cover plate (32) is also provided with a cable hole (9); The cable hole (9) is located at the center of the lower cover plate (32), and the detection circuit (4) is connected to the signal acquisition device (5) through the cable hole (9).

5. The ultra-high voltage AC line voltage and corona discharge detection device according to claim 4, characterized in that, The shielding box (3) also includes a front cover plate (33) and a rear cover plate (34); The front cover plate (33) is provided with a third bolt hole (10), the front end of the upper cover plate (31) is provided with a fifth bolt hole (12), and the front end of the lower cover plate (32) is provided with a sixth bolt hole (13). The front cover plate (33) is connected to the fifth bolt hole (12) and the sixth bolt hole (13) through the third bolt hole (10); The rear cover plate (34) is provided with a fourth bolt hole (11), the rear end of the upper cover plate (31) is provided with a seventh bolt hole (14), and the front end of the lower cover plate (32) is provided with an eighth bolt hole (15). The rear cover plate (34) is connected to the seventh bolt hole (14) and the eighth bolt hole (15) through the fourth bolt hole (11).

6. The ultra-high voltage AC line voltage and corona discharge detection device according to claim 1, characterized in that, The detection circuit (4) includes capacitor C2, resistor R1, resistor R2, and resistor R3; One end of the resistor R2 is connected to the metal induction plate (2), and the other end is connected to the signal acquisition device (5) via a cable; One end of the capacitor C2 is connected between the metal induction plate (2) and the resistor R2, and the other end is connected between the resistor R1 and the resistor R3; One end of the resistor R3 is connected between the resistor R1 and the capacitor C2, and the other end is connected to the signal acquisition device (5) through a cable; One end of the resistor R1 is connected between the capacitor C2 and the resistor R3, and the other end is connected to the ground terminal of the signal acquisition device (5) through a cable.

7. A device for detecting voltage and corona discharge of ultra-high voltage AC lines according to any one of claims 1-6, characterized in that, The drone (1) is a hovering drone.

8. A device for detecting voltage and corona discharge of an ultra-high voltage AC line according to any one of claims 1-6, characterized in that, The metal induction plate (2) is an aluminum plate.

Images