Non-contact zero-value insulator live detection method and system

Abstract

The present invention discloses a non-contact live detection system for zero-value insulators, which includes an aircraft, a spatial electric field detector and a ground station; the aircraft is used to carry the spatial electric field detector and fly near the overhead line insulators; the spatial electric field detector is used to detect the synthetic electric field intensity around the insulators and send the detection data to the ground station; the ground station is used to control the flight of the unmanned aircraft and receive and analyze the detection data to obtain the detection result of zero-value insulators. The present invention also discloses a non-contact live detection method for zero-value insulators, including: detecting the synthetic electric field intensity around the overhead line insulators by using an aircraft carrying a spatial electric field detector and sending the detection data to the ground station; the ground station controls the aircraft and analyzes the received detection data to obtain the detection result of zero-value insulators. The detection of zero-value insulators is realized in a way that avoids tower climbing and is non-contact; compared with the traditional tower climbing and manual detection by using the flight detection of the aircraft, it has high safety and high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of zero-value insulator detection, and in particular to a non-contact live detection method and system for zero-value insulators. Background Art

[0002] Porcelain insulators are widely used in transmission lines and substations and play an important role in ensuring the safe operation of the power system. Due to reasons such as manufacturing processes, transportation, and installation, the porcelain parts of insulators in transmission lines are prone to cracks. Moreover, the operating environment of insulators is complex and changeable, and they are subject to mechanical loads and overvoltages for a long time, resulting in breakdown of insulator cracks under the action of the electric field, a significant decline in insulation performance, and the generation of zero-value insulators. In overhead lines, accidents such as explosion and falling of porcelain insulators caused by the existence of zero-value insulators occur frequently, seriously affecting the normal operation of the power system.

[0003] Although scholars at home and abroad have carried out a large number of studies on the detection of zero-value porcelain insulators, at present, maintenance personnel still mainly use the insulation resistance method and the spark gap method to detect zero-value insulators. These two traditional detection methods are both contact methods and require tower climbing operations, both of which have the problems of large workload and dangerous work nature. Summary of the Invention

[0004] The purpose of the present invention is to provide a non-contact live detection method and system for zero-value insulators. When applied to the live inspection work of overhead lines, it enables operation and inspection personnel to detect zero-value insulators under the condition of no power outage, and achieves non-contact, tower-free climbing, and high efficiency, thus ensuring the safe and stable operation of the power system.

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned invention purpose:

[0006] The present invention provides a non-contact live detection system for zero-value insulators, including an aircraft, a space electric field detector, and a ground station;

[0007] The aircraft is used to carry the space electric field detector and fly near the insulators of the overhead line;

[0008] The space electric field detector is used to detect the synthetic electric field intensity around the insulator and send the detection data to the ground station;

[0009] The ground station is used to control the flight of the unmanned aircraft, receive and analyze the detection data, and obtain the detection result of the zero-value insulator.

[0010] Furthermore, the space electric field detector includes a detection antenna, an amplification and filtering module, a wireless transparent transmission module, an MCU module, and an inversion module;

[0011] The detection antenna is used to detect the power frequency electric field intensity and convert the power frequency electric field signal into a weak voltage signal;

[0012] The amplification and filtering module amplifies the weak voltage signal, filters out the high-frequency electromagnetic interference components, and outputs to the ADC port of the MCU module;

[0013] The MCU module collects the power frequency electric field signal at the ADC port, eliminates external interference by means of software filtering, and transmits the power frequency electric field signal to the wireless transparent transmission module;

[0014] The wireless transparent transmission module is used to receive the power frequency electric field signal and send it to the ground station, form an electric field distribution curve, and identify the position of the zero-value insulator through the electric field distribution curve;

[0015] The inverter module is used to connect to the power supply of the aircraft and supply power to the amplification and filtering module, wireless transparent transmission module, and MCU module.

[0016] Furthermore, the aircraft selects an unmanned aerial vehicle (UAV).

[0017] Furthermore, the UAV is a multi-rotor UAV with a load of more than 1 kg.

[0018] Furthermore, the battery of the UAV is connected to the inverter module to generate different voltages and supply power to the amplification and filtering module, wireless transparent transmission module, and MCU module.

[0019] Furthermore, the ground station has a UAV interface and a zero-value insulator detection interface.

[0020] The present invention provides a non-contact live detection method for zero-value insulators, including:

[0021] Detecting the synthetic electric field intensity around the overhead line insulator by an aircraft carrying a spatial electric field detector, and sending the detection data to the ground station;

[0022] The ground station controls the aircraft and analyzes the received detection data to obtain the detection result of the zero-value insulator.

[0023] Furthermore, the method of detecting the synthetic electric field intensity around the overhead line insulator by an aircraft carrying a spatial electric field detector, sending the detection data to the ground station, the ground station controlling the aircraft, and analyzing the received detection data to obtain the detection result of the zero-value insulator includes:

[0024] Using the ground station to control the aircraft to gradually approach the high-voltage end of the insulator, and keeping the distance from the outer edge of the insulator skirt at a set distance;

[0025] The ground station sends a detection instruction. At this time, the spatial electric field detector starts to send the electric field intensity data to the ground station, and at the same time controls the aircraft to fly straight from the high-voltage end of the insulator to the low-voltage end;

[0026] After the aircraft flies to the low - voltage end, the detection stops. At this time, the aircraft returns, and the space electric - field detector stops sending data to the ground station;

[0027] While the detection stops, the ground station has received the electric - field distribution curve near the insulator string. By judging whether there is an obvious depression in the electric - field distribution curve, the position of the zero - value insulator is where the depression appears.

[0028] Furthermore, the space electric - field detector includes a detection antenna, an amplification and filtering module, a wireless transparent transmission module, an MCU module, and an inverter module;

[0029] The detection antenna is used to detect the power - frequency electric - field intensity and convert the power - frequency electric - field signal into a weak voltage signal;

[0030] The amplification and filtering module amplifies the weak voltage signal and filters out the high - frequency electromagnetic interference components, and outputs to the ADC port of the MCU module;

[0031] The MCU module collects the power - frequency electric - field signal at the ADC port, and adopts software filtering to eliminate external interference, and transmits the power - frequency electric - field signal to the wireless transparent transmission module;

[0032] The wireless transparent transmission module is used to receive the power - frequency electric - field signal and send it to the ground station, form an electric - field distribution curve, and identify the position of the zero - value insulator through the electric - field distribution curve;

[0033] The inverter module is used to connect to the power supply of the aircraft and supply power to the amplification and filtering module, the wireless transparent transmission module, and the MCU module.

[0034] Furthermore, the acquisition method of the MCU module includes:

[0035] When the MCU module starts to run after initialization, the MCU module enters the "slow - scan mode", and the MCU module collects the electric - field intensity data every 5 s;

[0036] If the electric - field intensity E≥4 kV / m and the duration exceeds 10 s, then the MCU module enters the "fast - scan mode", and the MCU module collects the electric - field intensity data every 1 s;

[0037] If the electric - field intensity E<4 kV / m and the duration exceeds 10 s, then the MCU module enters the "sleep mode" and stops data acquisition;

[0038] After the MCU module enters the "sleep mode", its internal wake - up clock starts timing. After 20 s, the MCU module is "awakened" and enters the "slow - scan mode".

[0039] The beneficial effects of the present invention are as follows:

[0040] Implement zero-value insulator detection in a way that avoids tower climbing and is non-contact.

[0041] Through flight detection by an aircraft, compared with traditional tower climbing and manual detection, it has high safety and high efficiency.

[0042] Use the spatial electric field distribution as a characteristic parameter to detect and identify zero-value insulators, which is highly scientific and reliable. Description of the Drawings

[0043] Figure 1 It is a schematic structural diagram of a non-contact live detection system for zero-value insulators according to an embodiment of the present invention.

[0044] Figure 2 It is a flowchart of a non-contact live detection method for zero-value insulators according to an embodiment of the present invention.

[0045] Figure 3 It is a schematic composition diagram of a spatial electric field detector in a non-contact live detection system and method for zero-value insulators according to an embodiment of the present invention.

[0046] Figure 4 It is a schematic acquisition principle diagram of an MCU module in a non-contact live detection system and method for zero-value insulators according to an embodiment of the present invention. Detailed Embodiment

[0047] As Figure 1 shown, a non-contact live detection system for zero-value insulators provided by the present invention includes a drone 1, a spatial electric field detector 2, and a ground station 3. The drone is a multi-rotor drone with a load of more than 1 kg, and its function is to carry the spatial electric field detector and fly to a position about one meter away from the axial distance of the overhead line insulator; the spatial electric field detector detects the synthetic electric field intensity around the insulator in real time and sends the data to the ground station; the ground station has a drone interface and a zero-value insulator detection interface, and its functions are to control the flight of the drone, receive spatial electric field data, analyze spatial electric field data, and identify zero-value insulators.

[0048] As Figure 2As shown in the figure, a non-contact live detection method for zero-value insulators provided by the present invention has the following working process: The drone pilot uses the transmitted images from the ground station to control the drone to gradually approach the high-voltage end of the insulator, keeping a distance of 10 - 50 cm from the outer edge of the insulator's umbrella skirt. The drone pilot controls the ground station to send a detection instruction, and at this time, the space electric field detector starts to send electric field intensity data to the ground station. At the same time, the drone pilot controls the drone to fly straight from the high-voltage end of the insulator to the low-voltage end. After the drone flies to the low-voltage end, the detection stops. At this time, the drone returns, and the space electric field detector stops sending data to the ground station. At the same time as the detection stops, the ground station has received the electric field distribution curve near the insulator string, and then proceeds to identify the position of the zero-value insulator, that is, to determine whether there is an obvious depression in the curve. The depression is the position of the zero-value insulator.

[0049] As Figure 3 shown in the figure, the space electric field detector consists of a detection antenna, an amplification and filtering module, a wireless transparent transmission module, an MCU module, and an inverter module. The detection antenna is used to detect the power frequency electric field intensity. The working principle of the space electric field detector is as follows: The detection antenna converts the power frequency electric field signal into a millivolt-level voltage signal; the amplification and filtering module amplifies the weak voltage signal and filters out the high-frequency electromagnetic interference components, and outputs it to the ADC port of the MCU module; the MCU module collects the power frequency electric field signal at the ADC port and further eliminates external interference by means of software filtering, and then transmits the signal to the wireless transparent transmission module. The space electric field detector is powered by the drone. The drone battery is connected to the inverter module of the space electric field, and then different voltages are generated to supply power to the amplification and filtering module, the wireless transparent transmission module, and the MCU module respectively.

[0050] As Figure 4 shown in the figure, due to the limited endurance of the drone and the fact that it has to supply power to the space electric field detector, the space electric field detector adopts a low-power working mode. That is, after the MCU module of the space electric field detector is initialized and starts running, the MCU module enters the "slow scan mode". The MCU module collects the electric field intensity data every 5 s. If the electric field intensity E ≥ 4 kV / m and the duration exceeds 10 s, the MCU module enters the "fast scan mode", and the MCU module collects the electric field intensity data every 1 s; if E < 4 kV / m and the duration exceeds 10 s, the MCU module enters the "sleep mode", stops data collection, and at the same time the inverter module stops supplying power to the amplification and filtering module and the wireless transparent transmission module; after the MCU module enters the "sleep mode", the wake-up clock starts timing. After 20 s, the MCU module is "awakened" and enters the "slow scan mode".

[0051] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A non-contact live detection method for zero-value insulators, characterized in that, Including: A flying vehicle carrying a space electric field detector detects the synthetic electric field intensity around the overhead line insulator and sends the detection data to the ground station; the ground station controls the flying vehicle and analyzes the received detection data to obtain the detection result of the zero-value insulator; Among them, the method of using a flying vehicle carrying a space electric field detector to detect the synthetic electric field intensity around the overhead line insulator, send the detection data to the ground station, the ground station controls the flying vehicle, and analyze the received detection data to obtain the detection result of the zero-value insulator includes: Use the ground station to control the flying vehicle to gradually approach the high-voltage end of the insulator, and keep a set distance from the outer edge of the insulator skirt; The ground station sends a detection instruction. At this time, the space electric field detector starts to send the electric field intensity data to the ground station, and at the same time controls the flying vehicle to fly straight from the high-voltage end of the insulator to the low-voltage end; After the flying vehicle flies to the low-voltage end, the detection stops. At this time, the flying vehicle returns, and the space electric field detector stops sending data to the ground station; At the same time as the detection stops, the ground station has received the electric field distribution curve near the insulator string. By judging whether there is an obvious depression in the electric field distribution curve, the position of the zero-value insulator is the place where the depression appears; Among them, the space electric field detector includes a detection antenna, an amplification and filtering module, a wireless transparent transmission module, an MCU module and an inverter module: The detection antenna is used to detect the power frequency electric field intensity and convert the power frequency electric field intensity into a weak voltage signal; The amplification and filtering module amplifies the weak voltage signal and filters out the high-frequency electromagnetic interference component, and outputs it to the ADC port of the MCU module; The MCU module collects the power frequency electric field intensity of the ADC port, and adopts software filtering to eliminate external interference, and transmits the power frequency electric field intensity to the wireless transparent transmission module; The wireless transparent transmission module is used to receive the power frequency electric field intensity and send it to the ground station, form an electric field distribution curve, and identify the position of the zero-value insulator through the electric field distribution curve; The inverter module is used to connect to the power supply of the flying vehicle and supply power to the amplification and filtering module, the wireless transparent transmission module, and the MCU module; Among them, the acquisition method of the MCU module includes: When the MCU module starts running after initialization, the MCU module enters the "slow scan mode", and the MCU module collects the power frequency electric field intensity data every 5 s; If the power frequency electric field intensity E≥4 kV / m and the duration exceeds 10 s, the MCU module enters the "fast scan mode", and the MCU module collects the power frequency electric field intensity data every 1 s; If the power frequency electric field intensity E<4 kV / m and the duration exceeds 10 s, the MCU module enters the "sleep mode" and stops data collection; After the MCU module enters the "sleep mode", its internal wake-up clock starts timing. After 20 s, the MCU module is "awakened" and enters the "slow scan mode".

2. The non-contact live detection method for zero-value insulators according to claim 1, characterized in that The flying vehicle selects an unmanned aerial vehicle, and the unmanned aerial vehicle is a multi-rotor unmanned aerial vehicle with a load of more than 1 kg.

3. The non-contact live detection method for zero-value insulators according to claim 2, wherein, The battery of the unmanned aerial vehicle is connected to the inverter module to generate different voltages and supply power to the amplification and filtering module, the wireless transparent transmission module, and the MCU module.

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