Small current grounding system hidden fault positioning device and control method

Abstract

The invention discloses a low-current grounding system hidden fault positioning device and a control method, and mainly relates to the technical field of grounding fault detection of a 10-kilovolt line. Comprising a shell, the shell comprises two sections of hollow semi-circular ring structures, the two sections of semi-circular ring structures are provided with two connecting points, the two connecting points are provided with mounting mechanisms respectively, an electromagnetic mechanism is arranged on the inner side of the shell, and a main control mechanism and an energy supply mechanism are arranged on the outer sides of the two sections of semi-circular ring structures respectively; the electromagnetic mechanism is used for detecting the grounding current of the to-be-detected tower pole; the main control mechanism is used for carrying out data analysis on the grounding current detected by the electromagnetic mechanism and carrying out sound-light alarm; and the energy supply mechanism is used for supplying energy to the fault positioning device. The beneficial effects of the invention are that the installation time is shortened, the cost is reduced, and the detection efficiency and accuracy are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of grounding fault detection for 10 kV lines, and specifically to a hidden fault location device and control method for a small current grounding system. Background Art

[0002] In the power system, grounding faults of 10 kV lines are often caused by the breakdown of lightning arresters or insulators. Such single-phase breakdown faults are often accompanied by a small grounding current, resulting in unclear fault characteristics and making it difficult to quickly locate and repair the faults.

[0003] The existing technologies often have the following problems:

[0004] 1. Detection blind area: Traditional fault indicators have insufficient sensitivity to capacitive grounding current, and the false negative rate is as high as 60%;

[0005] 2. Installation risk: It is necessary to contact live wires or adjacent high-voltage equipment, which has the potential risk of electric shock and high insulation costs;

[0006] 3. Location delay: The average time-consuming for manual inspection is 4 - 6 hours, and the restoration of normal power supply is delayed, affecting power supply reliability and power quality, resulting in power outage losses for users.

[0007] Therefore, there is an urgent need for a non-contact, highly sensitive, and remotely monitorable fault location device to achieve rapid and accurate location of the fault point. Summary of the Invention

[0008] The purpose of the present invention is to provide a hidden fault location device and control method for a small current grounding system, which shortens the installation time, reduces costs, and improves the detection efficiency and accuracy.

[0009] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0010] On the one hand, a hidden fault location device for a small current grounding system is provided, including a housing. The housing includes two hollow semi-circular ring structures. There are two connection points between the two semi-circular ring structures. Installation mechanisms are respectively arranged at the two connection points. An electromagnetic mechanism is arranged inside the housing, and a main control mechanism and a power supply mechanism are respectively arranged outside the two semi-circular ring structures;

[0011] The electromagnetic mechanism is used to detect the grounding current of the tower to be measured;

[0012] The main control mechanism is used to analyze the data of the grounding current detected by the electromagnetic mechanism and give an audible and visual alarm;

[0013] The power supply mechanism is used to supply power to the fault location device.

[0014] Preferably, the installation mechanism includes four connecting ears. The four connecting ears are divided into two groups, and are respectively arranged at both ends of the two semi-circular structures. Mounting screw holes are respectively arranged on the four connecting ears.

[0015] Preferably, the electromagnetic mechanism includes two sections of soft magnetic cores and one section of coil. The two ends of the soft magnetic cores are respectively arranged inside the two semi-circular structures at both ends, and the coil is wound around the circumference of one of the two sections of soft magnetic cores.

[0016] Preferably, the main control mechanism is arranged on the outer side of the semi-circular structure where the coil is arranged. The main control mechanism includes a host. A DUT antenna and a power connection jack are respectively arranged on the outer side of the host. A control board and an acoustic-optic alarm system are arranged inside the host. The control board includes a main control module, a sensor module and a data transmission module. The sensor module is electrically connected to the coil.

[0017] Preferably, the energy supply mechanism includes a solar panel. A storage battery is arranged on one side of the solar panel, and a charge-discharge control module is arranged inside the storage battery.

[0018] Preferably, mounting rubber pads are arranged on the inner circumferences of the two semi-circular structures.

[0019] On the other hand, a control method for a hidden fault location device based on a small current grounding system is provided, including the following steps:

[0020] S1: Collect the grounding current signal passing through the fault location device, and send the collected current signal to the main control module;

[0021] S2: The main control module preprocesses the received current signal, and converts the current signal into a digital signal for data analysis;

[0022] S3: The main control module selects a data transmission path according to the analysis result.

[0023] Preferably, in step S1, specifically: when the grounding current passes through the center of the fault location device along the tower pole, an inductive effect is generated at the coil position of the fault location device, and the current information generated on the coil at this time is collected by the sensor module.

[0024] Preferably, in step S2, the preprocessing specifically includes: using a 50Hz frequency selection amplifier to extract the current information;

[0025] In step S2, the data analysis specifically includes: setting a maximum threshold value of the allowable passing current in the main control module, comparing the collected current information with the maximum threshold value of the allowable passing current. If the collected current information is greater than the maximum threshold value of the allowable passing current, record that the current information is abnormal.

[0026] Preferably, specifically: when the current information analyzed by the main control module is normal, the main control module only transmits the current information to the control background through the data transmission module; when the current information analyzed by the main control module is abnormal, while transmitting the current information to the control background through the data transmission module, the main control module also transmits a signal to the sound and light alarm system and triggers the sound and light alarm.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. The hidden fault location device for the small current grounding system provided by the present invention is installed on a non - energized electric pole, far away from the energized part, greatly improving the safety of operation;

[0029] 2. The hidden fault location device for the small current grounding system provided by the present invention does not directly contact the energized body, so no additional insulating materials and measures are required, reducing the cost of the equipment and simplifying the installation and maintenance process at the same time;

[0030] 3. The hidden fault location device for the small current grounding system provided by the present invention can accurately detect weak grounding current, and once an abnormality is detected, it can immediately locate the fault position and issue an alarm. This ability greatly shortens the time for fault troubleshooting and improves the reliability of the power system;

[0031] 4. The present invention adopts a specially designed 50Hz frequency - selective amplifier to enhance the signal processing ability. It can accurately extract the 50Hz frequency component from a complex electromagnetic environment, that is, the continuous or intermittent ground current generated by the lightning arrester or insulator under fault conditions. By selectively amplifying the specific frequency, the influence of other interference factors can be effectively excluded, ensuring the authenticity and accuracy of the detection results;

[0032] 5. The device of the present invention is equipped with a self - power supply system composed of a solar panel and a storage battery. Even in remote areas or under unstable power supply conditions, it can rely on its own energy to maintain normal operation, ensuring the long - term stable operation of the device;

[0033] 6. The present invention adopts a modular design concept. Each component such as the current detection loop, frequency - selective amplification circuit, communication module, etc. is relatively independent. Such a design not only facilitates the production and assembly process, but also makes it easier to repair and replace in case of problems in the future; at the same time, it reserves space for future technological upgrades. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is the front view of a hidden fault location device for the small current grounding system according to the present invention;

[0035] Figure 2It is a schematic diagram of the partial structure of a hidden fault location device based on a small current grounding system according to the present invention;

[0036] Figure 3 It is an enlarged schematic diagram of the partial structure of a hidden fault location device based on a small current grounding system according to the present invention;

[0037] Figure 4 It is a schematic diagram of the main control mechanism of a hidden fault location device based on a small current grounding system according to the present invention;

[0038] Figure 5 It is a circuit diagram of the acoustic-optic alarm system of a hidden fault location device based on a small current grounding system according to the present invention;

[0039] Figure 6 It is a schematic diagram of the energy supply mechanism of a hidden fault location device based on a small current grounding system according to the present invention;

[0040] Figure 7 It is a schematic diagram of the installation position of a hidden fault location device based on a small current grounding system according to the present invention;

[0041] Figure 8 It is a flowchart of the method of a hidden fault location device based on a small current grounding system according to the present invention.

[0042] Reference numerals shown in the drawings:

[0043] 1. Housing; 2. Soft magnetic core; 3. Mounting ear; 4. Mounting screw hole; 5. Coil; 6. Mounting rubber pad; 7. Solar panel; 8. Energy storage battery; 9. DUT antenna; 10. Host; 11. Acoustic-optic alarm system; 12. Power connection jack; 13. Wire; 14. Cross arm; 15. Tower pole; 16. Hidden fault location device for small current grounding system. Detailed implementation manners

[0044] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by this application.

[0045] In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings. They are only relationship words determined to facilitate the description of the structural relationship of each component or element of the present invention, and do not specifically refer to any component or element of the present invention. It should not be construed as a limitation of the present invention.

[0046] In the present invention, terms such as "fixed connection", "connected", "coupled" should be understood in a broad sense, which may mean a fixed connection, an integral connection or a detachable connection; it may be directly connected or indirectly connected through an intermediate medium. For those skilled in the relevant scientific research or technology in this field, the specific meanings of the above terms in the present invention can be determined according to specific circumstances, and it should not be construed as a limitation to the present invention.

[0047] Embodiment:

[0048] As Figure 1-3 shown, this embodiment provides a hidden fault location device for a small current grounding system, which includes a housing made of a durable engineering plastic. The housing includes two hollow semi-circular ring structures. In this embodiment, the two hollow semi-circular structures are designed to be concentric and of the same diameter. Therefore, at the four endpoints of the two semi-circular ring structures, two connection points are provided in pairs, and two installation mechanisms are respectively provided at the two connection points. An electromagnetic mechanism is arranged inside the housing, and a main control mechanism and an energy supply mechanism are respectively arranged on the outer sides of the two semi-circular ring structures. Installation rubber pads are arranged on the inner circumferences of the two semi-circular ring structures.

[0049] The installation mechanism includes four connection ears. In this embodiment, the connection ears are specifically rectangular parallelepiped structures with square tops and bottoms, and the side length of the square is the same as the cross-sectional length of the ring structure. Two of the connection ears are integrally arranged on both sides of the two ends of one semi-circular ring structure, and the other two connection ears are integrally arranged on both sides of the two ends of the other semi-circular ring structure. Installation screw holes are respectively provided on the four connection ears, and fixing bolts are fitted in the installation screw holes on the two connection ears close to each other.

[0050] The electromagnetic mechanism includes two sections of soft magnetic cores and a section of coil. The two ends of the soft magnetic cores are respectively arranged inside the two ends of the semi-circular ring structures. Since the hidden fault location device for the small current grounding system provided in this embodiment needs to be installed on tower poles of different thicknesses, the lengths of the two sections of soft magnetic cores can be adjusted according to the thickness of the tower poles to ensure that the two sections of soft magnetic cores are in close contact after the device is installed. The coil is wound around the circumference of one of the two sections of soft magnetic cores.

[0051] As Figure 4 shown, the main control mechanism is arranged on the outer side of the semi-circular ring structure close to the one where the coil is arranged. The main control mechanism includes a main unit. A DUT antenna and a power connection jack are respectively arranged on the outer side of the main unit. A control board and an acoustic-optic alarm system are arranged inside the main unit. Among them, the circuit diagram of the acoustic-optic alarm system is as Figure 5As shown in the figure, the control board includes a main control module, a sensor module, and a data transmission module. The sensor module is electrically connected to the coil. In this embodiment, the main control module selects a single-chip microcomputer with a control chip, the sensor module is a current sensor, and the data transmission module uses a 4G DTU module.

[0052] As Figure 6 shown, the power supply mechanism includes a solar panel. One side of the solar panel is provided with a storage battery. An input and output control module is arranged in the storage battery. The storage battery is provided with an electric wire, and the electric wire is used to supply power to the host through a power connection jack. In this embodiment, the input and output control module is used to perform perfect input and output management on the storage battery to protect the battery life, so that the entire device has high independence and adaptability.

[0053] As Figure 7 shown, the concealed fault location device of the small current grounding system in this embodiment is installed on each electric pole of the small current grounding system power grid, at a position 3-7 meters above the ground, to avoid being damaged or stolen by humans. The extended application can be installed in combination with the pole number plate. Each device is marked with its own unique identification code and geographical location information, powered by its own photovoltaic system, and communicates with the upper computer through a 4G network, and can operate reliably for a long time.

[0054] The concealed fault location device of the small current grounding system in this embodiment complies with the following installation and deployment specifications:

[0055] Position requirement: 5±2 meters above the ground, horizontal distance from the live wire ≥0.7m;

[0056] Network configuration: Each electric pole is independently coded, GIS coordinate error ≤5 meters;

[0057] Maintenance period: Battery life ≥5 years, annual maintenance man-hours ≤0.5h / unit.

[0058] As Figure 8 shown, this embodiment also provides a control method based on the concealed fault location device of the small current grounding system, including the following steps:

[0059] S1: Collect the grounding current signal passing through the fault location device, and send the collected current signal to the main control module;

[0060] S2: The main control module preprocesses the received current signal, and converts the current signal into a digital signal for data analysis;

[0061] S3: The main control module selects a data transmission path according to the analysis result.

[0062] Step S1 is specifically as follows: When the grounding current passes through the center of the fault location device along the tower pole, an inductance effect is generated at the coil position of the fault location device, and the sensor module collects the current information generated on the coil at this time.

[0063] In step S2, the preprocessing is specifically as follows: A 50Hz frequency-selective amplifier is used to extract the current information.

[0064] In step S2, the data analysis is specifically as follows: The maximum threshold of the allowable passing current is set in the main control module, and the collected current information is compared with the maximum threshold of the allowable passing current. If the collected current information is greater than the maximum threshold of the allowable passing current, the abnormal current information is recorded.

[0065] Step S3 is specifically as follows: When the current information analyzed by the main control module is normal, the main control module only transmits the current information to the control background through the data transmission module; when the current information analyzed by the main control module is abnormal, the main control module transmits the current information to the control background through the data transmission module, and at the same time, transmits a signal to the sound and light alarm system and triggers the sound and light alarm.

[0066] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A hidden fault location device for a small current grounding system, characterized in that, It includes a housing, which includes two hollow semi-circular ring structures. There are two connection points on the two semi-circular ring structures, and installation mechanisms are respectively arranged at the two connection points. An electromagnetic mechanism is arranged inside the housing, and a main control mechanism and an energy supply mechanism are respectively arranged on the outer sides of the two semi-circular ring structures; The electromagnetic mechanism is used to detect the grounding current of the tower pole to be measured; The main control mechanism is used to analyze the data of the grounding current detected by the electromagnetic mechanism and give an audible and visual alarm; The energy supply mechanism is used to supply energy to the fault location device.

2. The recessive fault location device for a small current grounding system according to claim 1, characterized in that The installation mechanism includes four connecting ears. The four connecting ears are divided into two groups and are respectively arranged at the two ends of the two semi-circular ring structures. Installation screw holes are respectively arranged on the four connecting ears.

3. The recessive fault location device for a small current grounding system according to claim 1, characterized in that, The electromagnetic mechanism includes two soft magnetic iron cores and a coil. The two soft magnetic iron cores are respectively arranged inside the two semi-circular ring structures at both ends, and the coil is wound around the circumference of one of the two soft magnetic iron cores.

4. The recessive fault location device for a small current grounding system according to claim 3, characterized in that, The main control mechanism is arranged on the outer side of the semi-circular ring structure close to the coil. The main control mechanism includes a host. A DUT antenna and a power connection jack are respectively arranged on the outer side of the host. A control board and an audible and visual alarm system are arranged inside the host. The control board includes a main control module, a sensor module and a data transmission module. The sensor module is electrically connected to the coil.

5. The recessive fault location device for a small current grounding system according to claim 4, characterized in that, The energy supply mechanism includes a solar panel. An energy storage battery is arranged on one side of the solar panel. A charge and discharge control module is arranged inside the energy storage battery. The energy storage battery is provided with an electric wire, and the electric wire is used to supply power to the host through the power connection jack.

6. The recessive fault location device for a small current grounding system according to claim 1, characterized in that, Installation rubber pads are arranged on the inner circumferences of the two semi-circular ring structures.

7. A control method for a hidden fault location device of a small current grounding system as described in claim 4, characterized in that, It includes the following steps: S1: Collect the grounding current signal passing through the fault location device and send the collected current signal to the main control module; S2: The main control module preprocesses the received current signal and converts the current signal into a digital signal for data analysis; S3: The main control module selects a data transmission path according to the analysis result.

8. A control method according to claim 7, characterized in that, For step S1, specifically: when the grounding current passes through the center of the fault location device along the tower pole, an inductive effect is generated at the coil position of the fault location device, and the sensor module collects the current information generated on the coil at this time.

9. A control method according to claim 7, characterized in that, In step S2, the preprocessing specifically is: use a 50Hz frequency selection amplifier to extract the current information; In step S2, the data analysis specifically is: set the maximum threshold value of the allowable passing current in the main control module, compare the collected current information with the maximum threshold value of the allowable passing current. If the collected current information is greater than the maximum threshold value of the allowable passing current, record that the current information is abnormal.

10. A control method according to claim 7, characterized in that, For step S3, specifically: when the current information analyzed by the main control module is normal, the main control module only transmits the current information to the control background through the data transmission module; when the current information analyzed by the main control module is abnormal, the main control module transmits the current information to the control background through the data transmission module and at the same time transmits a signal to the audible and visual alarm system and triggers the audible and visual alarm.

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