Non-contact power transmission network fault diagnosis device and system

Abstract

The utility model provides a non-contact power transmission network fault diagnosis device and system, and the device comprises an electric field collection board which is used for sensing and collecting a power frequency voltage magnetic field change signal of a power transmission line; the current sensor is used for sensing and collecting power frequency current and traveling wave current magnetic field change signals in the power transmission line; the main board is in signal communication connection with the electric field acquisition board and the current sensor through coaxial cables, and is used for receiving acquired power frequency voltage magnetic field change signals, power frequency current and traveling wave current magnetic field change signals which are used for judging whether a fault occurs in the line or not and judging the fault type; the GPS antenna is used for providing positioning information so as to judge the fault position on the line; the 4G antenna is used for reporting various information acquired by the device and a judgment result to the cloud platform master station; the energy storage battery provides electric energy for the whole device through the power supply board and the power supply protection board; the power panel is used for independently supplying power to the whole device, and the power protection board is used for providing EMC electromagnetic protection for the whole device.

Description

Technical Field

[0001] This utility model relates to the field of fault diagnosis of overhead power transmission networks, specifically to a non-contact power transmission network fault diagnosis device and system. Background Technology

[0002] The safety, reliability, and stability of high-voltage overhead transmission networks are becoming increasingly important for our economic development. However, high-voltage overhead transmission lines are long, complex, span wide areas, and are subject to variable weather conditions. When a fault occurs, it is difficult for maintenance personnel to quickly inspect and troubleshoot the line. Furthermore, failing to locate the fault point quickly can severely impact the operational reliability of the power grid. This necessitates a fault location device that can rapidly and accurately provide the fault location and type, enabling maintenance personnel to identify and quickly locate the fault in advance.

[0003] Currently used fault location devices are mostly contact-type devices. However, contact-type devices need to be installed on high-voltage conductors and rely on current transformers (CTs) for power. This means that the fault type identification and location accuracy of the fault location device are affected by the complex electromagnetic field of the conductor, high-voltage discharge corona, and conductor fatigue. Moreover, contact-type devices must be installed at height during power outages. Power outages affect the State Grid's power outage plans, and installation at heights poses personal safety risks. These factors greatly limit the scope of application of contact-type devices.

[0004] Therefore, designing a fault diagnosis device that does not require high-altitude installation and avoids the influence of conductor contact will greatly improve the accuracy of fault type identification and fault location accuracy, which is of great significance for improving the operation and maintenance efficiency of transmission lines and ensuring the reliable and stable operation of the lines. Summary of the Invention

[0005] To address the problems existing in the current technology, a non-contact power transmission network fault diagnosis device and system is provided.

[0006] The technical solution adopted in this utility model is:

[0007] In a first aspect, this utility model provides a non-contact power transmission network fault diagnosis device, comprising:

[0008] Electric field acquisition board, used to sense and acquire the power frequency voltage magnetic field change signal of transmission lines;

[0009] Current sensors are used to sense and collect signals of changes in the magnetic field of power frequency current and traveling wave current in power transmission lines.

[0010] The motherboard is connected to the electric field acquisition board and the current sensor via coaxial cables to receive the power frequency voltage magnetic field change signal, power frequency current and traveling wave current magnetic field change signal, which are used to determine whether a fault has occurred in the line and the type of fault.

[0011] The GPS antenna is communicatively connected to the motherboard and is used to provide positioning information to determine the location of the fault on the line.

[0012] The 4G antenna is connected to the motherboard and is used to report various information collected by the device and judgment results to the cloud platform main station.

[0013] The energy storage battery provides power to the entire device through the power board and the power protection board; the power board is used to provide independent power to the entire device, and the power protection board is used to provide EMC electromagnetic protection to the entire device.

[0014] Based on the above, it also includes a housing consisting of a main unit chassis and an antenna radome;

[0015] The motherboard, the power board, the power protection board, and the energy storage battery are all fixed inside the main unit chassis by screws.

[0016] The antenna cover is fastened to the top of the main unit chassis by screws;

[0017] The electric field acquisition board and the current sensor are both fixed and sealed in the middle cavity of the radome with potting compound, and are connected to the main board through a coaxial cable passing through a waterproof connector.

[0018] The GPS antenna is secured to the antenna cover with screws; the 4G antenna is fixedly installed at both ends of the top of the main unit chassis.

[0019] Based on the above, surge protectors are also included;

[0020] The surge protector is connected to the motherboard and is used to provide lightning surge protection for the entire device; the surge protector is fixedly installed inside the main unit chassis by a back clip.

[0021] Based on the above, a first electromagnetic isolation shield is provided for the surge protector to isolate the radiated crosstalk between the surge protector and the motherboard.

[0022] Based on the above, a second electromagnetic isolation cover is provided for the power board and the power protection board to isolate the radiated crosstalk between the power board and the power protection board and the motherboard.

[0023] Based on the above, it also includes a solar panel that charges the energy storage battery via an aviation plug.

[0024] Based on the above, the outer side of the main unit is provided with a mounting plate for mounting the main unit on the crossbar of the power tower.

[0025] Secondly, this utility model provides a non-contact power transmission network fault diagnosis system, including several of the aforementioned non-contact power transmission network fault diagnosis devices.

[0026] One of the aforementioned contactless power grid fault diagnosis devices is installed at each site.

[0027] This utility model has substantial features and advancements compared to existing contact devices, specifically:

[0028] 1. It does not come into contact with high-voltage conductors and only needs to be installed on the crossbar of the power tower, avoiding high-altitude work and making installation safe and convenient;

[0029] 2. It uses solar energy, eliminating the need for CT contact energy extraction and avoiding the effects of complex electromagnetic fields, high-voltage discharge corona, and conductor fatigue from power transmission lines.

[0030] 3. No power outage is required for installation, and it is not affected by the State Grid's power outage plans, thus having a wider range of applications;

[0031] 4. Compared to the contact type device which requires two units per phase line in a single circuit between two stations, this non-contact type device does not require installation in each circuit; only two units are needed between two stations, resulting in lower installation costs. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the external structure of the box body of this utility model.

[0033] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0034] Figure 3 This is a schematic diagram of the solar power supply of this utility model.

[0035] In the diagram: 1. Antenna radome; 2. Electric field acquisition board; 3. Current sensor; 4. 4G antenna; 5. GPS antenna; 6. Main unit chassis; 7. Waterproof connector; 8. Main board; 9. Power supply board; 10. Power protection board; 11. Surge protector; 12. Crimping terminal; 13-1. Energy storage battery; 13-2. First electromagnetic isolation cover; 14-1. Second electromagnetic isolation cover; 14-2. Aviation plug; 15. Solar panel; 16. Mounting plate; 17. Detailed Implementation

[0036] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. Example 1

[0037] like Figures 1-3As shown, this embodiment provides a non-contact power grid fault diagnosis device, including an antenna cover 1, an electric field acquisition board 2, a current sensor 3, a 4G antenna 4, a GPS antenna 5, a main unit 6, a waterproof connector 7, a main board 8, a power board 9, a power protection board 10, a surge protector 11, a clamping terminal 12, an energy storage battery 13, a second electromagnetic isolation cover 14-1, a first electromagnetic isolation cover 14-2, an aviation plug 15, and a solar panel 16;

[0038] The main unit 6 and the antenna cover 1 constitute the housing of the non-contact power transmission network fault diagnosis device; the outside of the main unit 6 is provided with a mounting plate 17 for mounting the main unit 6 on the crossbar of the power tower.

[0039] The radome 1 is screwed and installed on the top of the main unit chassis 6. The GPS antenna 5 is screwed and installed on the radome 1. The 4G antenna 4 is fixedly installed at both ends of the top of the main unit chassis 6. The electric field acquisition board 2 and the current sensor 3 are fixedly sealed in the middle cavity of the radome 1 with potting compound and are connected to the motherboard inside the main unit chassis 6 for signal communication via a coaxial cable passing through the waterproof connector 7. The motherboard 8, the power board 9, the power protection board 10, the energy storage battery 13, the second electromagnetic isolation cover 14-1, and the first electromagnetic isolation cover 14-2 are all fixed to the main unit chassis 6 with screws. The first electromagnetic isolation cover 14-2 is designed for the surge protector, and the second electromagnetic isolation cover 14-1 is designed for the power board 9 and the power protection board 10. The surge protector 11 and the clamping terminal 12 are fixedly installed on the main unit chassis 6 with a back clip. The aviation plug 15 is installed at the bottom of the main unit chassis 6, and the solar panel 16 is connected to the energy storage battery through the aviation plug 15.

[0040] The working principle of the non-contact power grid fault diagnosis device in this embodiment:

[0041] The GPS antenna 5 is communicatively connected to the motherboard and is used to provide positioning information to determine the location of a fault on the line.

[0042] The 4G antenna is communicatively connected to the motherboard and is used to report various information collected by the device and judgment results to the cloud platform main station.

[0043] The electric field acquisition board is used to sense and acquire the power frequency voltage magnetic field change signal of the transmission line, and the current sensor is used to sense and acquire the power frequency current and traveling wave current magnetic field change signals in the transmission line. Both the electric field acquisition board and the current sensor can be broadband electromagnetic field sensors; a broadband electromagnetic field sensor is a device capable of detecting and measuring electromagnetic fields (electric and / or magnetic fields) over a wide frequency range. Its core feature is its wide frequency coverage (e.g., from a few Hz to tens of GHz), making it suitable for monitoring and analysis in various electromagnetic environments. It should be noted that conventional techniques in the field can be used to acquire the power frequency voltage magnetic field change signal, power frequency current, and traveling wave current magnetic field change signal using a broadband electromagnetic field sensor.

[0044] The motherboard is used to receive the collected power frequency voltage magnetic field change signal, power frequency current and traveling wave current magnetic field change signal, and to determine whether a fault has occurred in the line and the type of fault by analyzing the power frequency voltage magnetic field change signal, power frequency current and traveling wave current magnetic field change signal. It should be noted that conventional technical means in this field can be used to determine whether a fault has occurred in the line and the type of fault by analyzing the power frequency voltage magnetic field change signal, power frequency current and traveling wave current magnetic field change signal.

[0045] The energy storage battery provides power to the entire device through a power board and a power protection board; the power board is used to provide independent power to the entire device, and the power protection board is used to provide EMC electromagnetic protection to the entire device.

[0046] The surge protector is connected to the motherboard and is used to provide lightning surge protection for the entire device.

[0047] The first electromagnetic shield is used to isolate radiated crosstalk between the surge protector and the motherboard.

[0048] The second electromagnetic shield is used to isolate the power board and the power protection board from the motherboard via radiated crosstalk. Example 2

[0049] This embodiment provides a non-contact power transmission network fault diagnosis system, including several non-contact power transmission network fault diagnosis devices as described in Embodiment 1;

[0050] At each site, one of the aforementioned contactless power grid fault diagnosis devices is installed.

[0051] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A non-contact power transmission network fault diagnosis device, characterized in that, include: Electric field acquisition board, used to sense and acquire the power frequency voltage magnetic field change signal of transmission lines; Current sensors are used to sense and collect signals of changes in the magnetic field of power frequency current and traveling wave current in power transmission lines. The motherboard is connected to the electric field acquisition board and the current sensor via coaxial cables to receive the power frequency voltage magnetic field change signal, power frequency current and traveling wave current magnetic field change signal, which are used to determine whether a fault has occurred in the line and the type of fault. The GPS antenna is communicatively connected to the motherboard and is used to provide positioning information to determine the location of the fault on the line. The 4G antenna is connected to the motherboard and is used to report the information collected by the device and the judgment results to the cloud platform main station. The energy storage battery provides power to the entire device through the power board and the power protection board; the power board is used to provide independent power to the entire device, and the power protection board is used to provide EMC electromagnetic protection to the entire device.

2. The non-contact power transmission network fault diagnosis device according to claim 1, characterized in that, It also includes a housing consisting of a main unit chassis and an antenna radome; The motherboard, the power board, the power protection board, and the energy storage battery are all fixed inside the main unit chassis by screws. The antenna cover is fastened to the top of the main unit chassis by screws; The electric field acquisition board and the current sensor are both fixed and sealed in the middle cavity of the radome with potting compound, and are connected to the main board through a coaxial cable passing through a waterproof connector. The GPS antenna is secured to the antenna cover with screws; the 4G antenna is fixedly installed at both ends of the top of the main unit chassis.

3. The non-contact power transmission network fault diagnosis device according to claim 2, characterized in that, It also includes surge protectors; The surge protector is connected to the motherboard and is used to provide lightning surge protection for the entire device; the surge protector is fixedly installed inside the main unit chassis by a back clip.

4. The non-contact power transmission network fault diagnosis device according to claim 3, characterized in that, The surge protector is provided with a first electromagnetic isolation shield to isolate radiated crosstalk between the surge protector and the motherboard.

5. The non-contact power transmission network fault diagnosis device according to claim 4, characterized in that, A second electromagnetic isolation cover is provided for the power board and the power protection board to isolate the radiated crosstalk between the power board and the power protection board and the motherboard.

6. The non-contact power transmission network fault diagnosis device according to any one of claims 1-5, characterized in that, It also includes solar panels that charge the energy storage battery via an aviation connector.

7. The non-contact power transmission network fault diagnosis device according to any one of claims 2-5, characterized in that, The outside of the main unit is provided with a mounting plate for mounting the main unit on the crossbar of the power tower.

8. A non-contact power transmission network fault diagnosis system, characterized in that: Includes the non-contact power transmission network fault diagnosis device as described in any one of claims 1-7; At each site, one of the aforementioned contactless power grid fault diagnosis devices is installed.

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