Grounding resistance automatic discrimination device based on Beidou technology

Abstract

The invention discloses a grounding resistance automatic discrimination device based on Beidou technology, and the device comprises a grounding resistance monitoring unit which is electrically connected with a detected grounding body; the current electrode auxiliary grounding rod is arranged at a position far away from the tested grounding body and is electrically connected with the grounding resistance monitoring unit; the voltage electrode auxiliary grounding rod is arranged between the tested grounding body and the current electrode auxiliary grounding rod and is electrically connected with the grounding resistance monitoring unit; the wireless communication module is connected with the grounding resistance monitoring unit and sends monitoring data of the grounding resistance monitoring unit to a remote terminal in a Beidou communication mode; and the remote terminal is used for receiving the monitoring data sent to the grounding resistance monitoring unit and sent by the wireless communication module, judging whether the grounding resistance is in a safe numerical range or not according to the monitoring data, and giving an alarm to remind related personnel if the grounding resistance is not in the safe numerical range. According to the invention, automatic and non-blind area real-time monitoring and abnormal early warning of the grounding resistor are realized.

Description

Technical Field

[0001] This invention relates to the field of power system safety monitoring technology, and in particular to an automatic grounding resistance identification device based on Beidou technology. Background Technology

[0002] Grounding resistance is a core indicator of the safe operation of a power system. Its value directly affects the insulation protection of equipment, the prevention and control of electric shock risks to personnel, and the discharge capacity of lightning overvoltages. In power engineering practice, grounding resistance must be maintained within a safe threshold range for extended periods. An abnormally high resistance can lead to serious consequences such as equipment damage, escalation of lightning strikes, or electric shocks to personnel. Therefore, real-time and reliable monitoring of the power frequency grounding resistance in scenarios such as distribution substations and outdoor power facilities is a crucial step in ensuring the safe and stable operation of the power system.

[0003] With the expansion of power system coverage, grounding resistance monitoring scenarios are becoming increasingly complex, encompassing not only substations around cities but also remote, inaccessible, and harsh environments such as mountainous areas, deserts, and remote fields. However, current grounding resistance monitoring largely relies on manual, portable on-site measurements. Staff must carry specialized instruments to the monitoring point, manually collecting data by temporarily setting up electrodes. This method has significant limitations: firstly, the monitoring cycle is long, making it impossible to capture real-time dynamic changes in grounding resistance. If the resistance suddenly rises abnormally between monitoring intervals, it can easily lead to safety accidents due to delayed detection. Secondly, for remote, inaccessible monitoring points, manual round trips are costly and inefficient, making it difficult to achieve routine, continuous monitoring and creating significant monitoring blind spots. Furthermore, current technology can only collect grounding resistance data; it cannot automatically identify or provide real-time warnings. Measurement data requires manual analysis by staff to determine if it falls within a safe range. Even if abnormal data is detected, manual notification to relevant personnel is necessary, making the entire process time-consuming and potentially leading to the escalation of potential hazards. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, such as reliance on intermittent manual measurement for ground resistance monitoring, communication limitations due to terrestrial networks resulting in coverage blind spots, lack of automatic identification and real-time alarm mechanisms, and non-standard configuration of auxiliary electrodes. These shortcomings make it difficult to achieve real-time, reliable, and automated monitoring of ground resistance. This invention provides an automatic ground resistance identification device based on BeiDou technology. The device connects the ground resistance monitoring unit to the grounding body under test and two auxiliary grounding rods electrically. Data is transmitted to a remote terminal via a wireless communication module. The terminal automatically identifies the safety status and issues an alarm for any abnormalities, thus achieving real-time monitoring of ground resistance, eliminating communication blind spots, and providing real-time early warning.

[0005] The objective of this invention is achieved through the following technical solution: An automatic grounding resistance determination device based on BeiDou technology includes: The grounding resistance monitoring unit is electrically connected to the grounding electrode being tested. The current electrode auxiliary grounding rod is set away from the grounding body being measured and is electrically connected to the grounding resistance monitoring unit. The voltage electrode auxiliary grounding rod is installed between the grounding body under test and the current electrode auxiliary grounding rod, and is electrically connected to the grounding resistance monitoring unit. The wireless communication module is connected to the grounding resistance monitoring unit and sends the monitoring data of the grounding resistance monitoring unit to the remote terminal via Beidou communication. The remote terminal is used to receive monitoring data from the grounding resistance monitoring unit sent by the wireless communication module, and to determine whether the grounding resistance is within the safe value range based on the monitoring data. If it is not within the safe value range, an alarm will be issued to remind relevant personnel.

[0006] Preferably, the grounding resistance monitoring unit is connected to the grounding body under test, the current electrode auxiliary grounding rod, or the voltage electrode auxiliary grounding rod via test leads with insulating sleeves.

[0007] Preferably, the length of the current test line between the current electrode auxiliary grounding rod and the grounding resistance monitoring unit is 4-5 times the length of the maximum diagonal of the grounding body under test, and the length of the voltage test line between the voltage electrode auxiliary grounding rod and the grounding resistance monitoring unit is 0.618 times the length of the current test line. The current electrode auxiliary grounding rod, the voltage electrode auxiliary grounding rod, and the grounding body under test are all on the same straight line, and this straight line is parallel to the maximum diagonal of the grounding body under test.

[0008] Preferably, the length of the current test line between the current electrode auxiliary grounding rod and the grounding resistance monitoring unit is twice the maximum diagonal length of the grounding body under test, and the length of the voltage test line between the voltage electrode auxiliary grounding rod and the grounding resistance monitoring unit is equal to the length of the current test line. The current electrode auxiliary grounding rod, the voltage electrode auxiliary grounding rod, and the grounding body under test are arranged in a triangle.

[0009] Preferably, the grounding resistance monitoring unit is powered by a battery, which is charged by a solar panel.

[0010] As a preferred embodiment, the automatic grounding resistance identification device based on Beidou technology also includes a temperature and humidity sensor, which is connected to the grounding resistance monitoring unit. The grounding resistance monitoring unit also transmits the data collected by the temperature and humidity sensor to a remote terminal through a wireless communication module.

[0011] Preferably, the wireless communication module also transmits the monitoring data of the grounding resistance monitoring unit to the remote terminal via 4G or 5G communication.

[0012] Preferably, the wireless communication module also has a built-in signal strength monitoring unit for real-time monitoring of the stability of 4G / 5G signals and BeiDou RDSS signals. When the signal strength of the current communication mode is lower than a preset threshold, it automatically switches to another communication mode.

[0013] Preferably, the remote terminal is also equipped with a historical data storage and multi-dimensional analysis module, which stores grounding resistance monitoring data in groups according to time period and monitoring area, and generates resistance change trend curves.

[0014] The beneficial effects of this invention are: This invention realizes automated, blind-spot-free real-time monitoring and anomaly early warning of grounding resistance, solving the core problems of traditional technology that rely on manual measurement, limited communication, and delayed response. By constructing a fixed measurement loop through the grounding resistance monitoring unit and dual auxiliary grounding rods, and by using the wireless communication module of Beidou communication to break through the limitations of ground network coverage, the remote terminal automatically judges the safety status of the resistance and issues an alarm in real time. The closed loop of data collection, transmission, judgment, and early warning can be completed without manual supervision, ensuring that grounding resistance anomalies in various scenarios such as remote fields and urban power distribution rooms can be quickly detected and dealt with.

[0015] By employing test leads with insulated sheaths and standardized wiring rules, soil interference and signal distortion are avoided. Combined with data compensation from temperature and humidity sensors, the stability and accuracy of resistance monitoring are further improved. Relying on an independent power supply system of solar energy and batteries, the device requires no external power source and can be flexibly deployed in outdoor environments without an external power source.

[0016] The remote terminal's historical data storage and multi-dimensional analysis functions can group and store data by time and region and generate trend curves, which not only makes it convenient for staff to trace changes in the grounding system status, but also provides data support for subsequent maintenance decisions. Attached Figure Description

[0017] Figure 1 This is a flowchart of the present invention.

[0018] The components include: 1. Grounding resistance monitoring unit; 2. Grounding body under test; 3. Current electrode auxiliary grounding rod; 4. Voltage electrode auxiliary grounding rod; 5. Wireless communication module; 6. Remote terminal; 7. Battery; and 8. Solar charging panel. Detailed Implementation

[0019] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0020] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0021] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0022] Example 1: An automatic grounding resistance determination device based on BeiDou technology, such as Figure 1 As shown, it includes: The grounding resistance monitoring unit 1 is electrically connected to the grounding body 2 being tested; The current electrode auxiliary grounding rod 3 is set away from the grounding body being measured and is electrically connected to the grounding resistance monitoring unit. The voltage electrode auxiliary grounding rod 4 is set between the grounding body under test and the current electrode auxiliary grounding rod, and is electrically connected to the grounding resistance monitoring unit. The wireless communication module 5 is connected to the grounding resistance monitoring unit via RS485 or RS232 and sends the monitoring data of the grounding resistance monitoring unit to the remote terminal via Beidou communication. Remote terminal 6 is used to receive monitoring data from the grounding resistance monitoring unit sent by the wireless communication module, and to determine whether the grounding resistance is within the safe value range based on the monitoring data. If it is not within the safe value range, an alarm will be issued to remind relevant personnel. The grounding resistance monitoring unit is powered by a storage battery 7, which provides a 12V DC power supply. The storage battery is charged by a solar charging panel 8.

[0023] The grounding resistance monitoring unit is connected to the grounding body under test, the current electrode auxiliary grounding rod, or the voltage electrode auxiliary grounding rod via test leads with insulating sleeves.

[0024] The length of the current test line between the current electrode auxiliary grounding rod and the grounding resistance monitoring unit is 4-5 times the length of the maximum diagonal of the grounding body under test. The length of the voltage test line between the voltage electrode auxiliary grounding rod and the grounding resistance monitoring unit is 0.618 times the length of the current test line. The current electrode auxiliary grounding rod, the voltage electrode auxiliary grounding rod, and the grounding body under test are all on the same straight line, and this straight line is parallel to the maximum diagonal of the grounding body under test.

[0025] In this method, the auxiliary grounding rods for the current electrode and the auxiliary grounding rod for the voltage electrode are arranged in parallel wiring. The auxiliary grounding rods for the current electrode, the auxiliary grounding rods for the voltage electrode, and the grounding body under test are all on the same straight line, and this straight line is parallel to the maximum diagonal of the grounding body under test, so as to avoid current field interference and ensure measurement accuracy.

[0026] The voltage test line length between the voltage electrode auxiliary grounding rod and the grounding resistance monitoring unit is set to be 0.618 times the current test line length (golden ratio). This ensures that the voltage electrode auxiliary grounding rod is exactly in the zero potential region, thus enabling accurate acquisition of the potential difference directly related to the grounding resistance.

[0027] Because the three electrodes are aligned in a straight line and parallel to the diagonal of the grounding grid, the test current can spread evenly along the soil and will not overlap with the current field of the grounding electrode being tested. At the same time, the voltage electrodes are arranged according to the golden ratio position, which can avoid the interference of soil stray potentials. Ultimately, this ensures that the measured grounding resistance value is true and reliable, and is more suitable for scenarios with uneven soil resistivity.

[0028] The automatic grounding resistance identification device based on Beidou technology also includes a temperature and humidity sensor, which is connected to the grounding resistance monitoring unit. The grounding resistance monitoring unit also sends the data collected by the temperature and humidity sensor to a remote terminal through a wireless communication module.

[0029] The wireless communication module also transmits monitoring data from the grounding resistance monitoring unit to a remote terminal via 4G or 5G communication.

[0030] The wireless communication module also has a built-in signal strength monitoring unit, which is used to monitor the stability of 4G / 5G signals and BeiDou RDSS signals in real time. When the signal strength of the current communication mode is lower than a preset threshold, it automatically switches to another communication mode.

[0031] The remote terminal is also equipped with a historical data storage and multi-dimensional analysis module, which stores grounding resistance monitoring data in groups according to time period and monitoring area, and generates resistance change trend curves.

[0032] In this embodiment, to avoid environmental interference and ensure data reliability, data correction and anomaly detection will be performed during the monitoring process, as detailed below: The device integrates temperature and humidity sensors to collect on-site temperature and humidity data in real time. Soil temperature and humidity affect resistivity; for example, moist soil has low resistivity, while dry soil has high resistivity. The monitoring unit will combine this data to compensate and correct the calculated resistance value, reduce environmental interference, and optimize monitoring stability.

[0033] Example 2: An automatic grounding resistance identification device based on Beidou technology has the same principle and implementation method as Embodiment 1. The difference is that the length of the current test line between the current electrode auxiliary grounding rod and the grounding resistance monitoring unit is twice the maximum diagonal length of the grounding body under test, the length of the voltage test line between the voltage electrode auxiliary grounding rod and the grounding resistance monitoring unit is equal to the length of the current test line, and the current electrode auxiliary grounding rod, the voltage electrode auxiliary grounding rod and the grounding body under test are arranged in a triangle.

[0034] The arrangement of this scheme places the current electrode auxiliary grounding rod, the voltage electrode auxiliary grounding rod, and the grounding body under test in a triangular arrangement, usually with an included angle of about 60 degrees. This is suitable for scenarios with uniform soil resistivity and greatly improves wiring efficiency compared to the parallel wiring method.

[0035] This embodiment is applicable to the monitoring of grounding grids of 10 kV transmission lines in remote mountainous areas. The grounding body under test is a diamond-shaped grounding grid with a maximum diagonal length of 20 m. The soil type is sandy soil with uniform resistivity. The monitoring point is located in a mountainous area at an altitude of 800 m, with no 4G / 5G signal coverage. The lowest temperature in winter is -15℃. It needs to resist strong electromagnetic interference and rain and snow erosion to achieve unattended long-term monitoring.

[0036] Grounding resistance monitoring unit: Selects a low-power monitoring module with static power consumption ≤5mA, measurement accuracy ±0.5%FS, and built-in anti-electromagnetic interference module to resist strong electromagnetic radiation around the transmission line.

[0037] Auxiliary grounding rod: Select a φ25mm×1200mm anti-corrosion alloy grounding rod, drive it into the soil to a depth of 800mm, and ensure close contact with the soil.

[0038] Test leads: Double-insulated silicone test leads, 4mm in diameter. 2 It has a pressure drop of less than 3% per 100 meters, excellent low-temperature resistance, and can maintain its flexibility in an environment of -30℃.

[0039] Wireless communication module: The Beidou DM222 short message communication module is adopted, which supports Beidou-3 regional communication, with a transmission power of 5W and a bit error rate of ≤1E-5, ensuring stable communication in mountainous areas without terrestrial networks.

[0040] Power supply system: Equipped with a 50W polycrystalline silicon solar panel (18% low light conversion efficiency) + 12V / 150Ah lithium iron phosphate battery, and a low temperature controller, it can charge and discharge normally in an environment of -20℃, and provide continuous power for 10 days on cloudy and rainy days.

[0041] Temperature and humidity sensor: Integrated inside the grounding resistance monitoring unit, it collects temperature and humidity data at a depth of 30cm below the soil surface to dynamically correct the resistance measurement value.

[0042] In this embodiment, a triangular wiring method is adopted. The distance between the current electrode (C electrode) and the edge of the grounding body under test is set to twice the maximum diagonal length, and the current test line length is 40m. The voltage test line length is equal to the current test line length (40m). The current electrode, voltage electrode, and grounding body under test are arranged at a 60° angle. The wiring accuracy is calibrated according to the 3-4-5 triangle rule to ensure that the electrode position error is ≤0.5m.

[0043] The protective enclosure is an IP67 waterproof and dustproof enclosure with an internal electromagnetic shielding layer. It is installed on a concrete base 5m away from the grounding electrode. The solar panel is tilted at 45° (to adapt to the sunlight angle in mountainous areas). The test lines are buried underground and covered with protective sleeves to prevent damage by wild animals.

[0044] The remote terminal is linked with the mobile APP of the maintenance personnel. The preset grounding resistance safety threshold is ≤10Ω, and it supports the generation of trend curves by week / month based on historical data.

[0045] After the device is deployed, the grounding resistance monitoring unit collects data every 10 minutes and transmits the data to the remote terminal through the Beidou DM222 module. The transmission time for a single message is ≤2 seconds, and the monthly communication power consumption accounts for only 8% of the total battery capacity.

[0046] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0047] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A device for automatically distinguishing ground resistance based on Beidou technology, characterized in that, The utility model relates to a kind of ground resistance monitoring unit, including: Ground resistance monitoring unit is electrically connected with the ground body to be measured; Current electrode auxiliary ground rod is arranged away from the ground body to be measured, and is electrically connected with ground resistance monitoring unit; Voltage electrode auxiliary ground rod is arranged between the ground body to be measured and the current electrode auxiliary ground rod, and is electrically connected with ground resistance monitoring unit; Wireless communication module is connected with ground resistance monitoring unit, and sends the monitoring data of ground resistance monitoring unit to remote terminal by the way of Beidou communication; Remote terminal is used to receive the monitoring data of ground resistance monitoring unit sent by wireless communication module, and judge whether ground resistance is in safe value range according to monitoring data, and if not in safe value range, then send out alarm to remind relevant personnel.

2. The automatic grounding resistance discrimination device based on Beidou technology according to claim 1, characterized in that, The ground resistance monitoring unit is connected with the ground body to be measured, the current electrode auxiliary ground rod or the voltage electrode auxiliary ground rod through the test line with insulating sleeve.

3. The automatic grounding resistance discrimination device based on Beidou technology according to claim 2, characterized in that, The length of the current test line between the current electrode auxiliary ground rod and the ground resistance monitoring unit is 4-5 times the maximum diagonal length of the ground body to be measured, the length of the voltage test line between the voltage electrode auxiliary ground rod and the ground resistance monitoring unit is 0.618 times the length of the current test line, and the current electrode auxiliary ground rod, the voltage electrode auxiliary ground rod and the ground body to be measured are on the same straight line and the straight line is parallel to the maximum diagonal of the ground body to be measured.

4. The automatic grounding resistance discrimination device based on Beidou technology according to claim 2, characterized in that, The length of the current test line between the current electrode auxiliary ground rod and the ground resistance monitoring unit is 2 times the maximum diagonal length of the ground body to be measured, the length of the voltage test line between the voltage electrode auxiliary ground rod and the ground resistance monitoring unit is equal to the length of the current test line, and the current electrode auxiliary ground rod, the voltage electrode auxiliary ground rod and the ground body to be measured are arranged in a triangular shape.

5. The automatic grounding resistance discrimination device based on Beidou technology according to claim 1, characterized in that, The ground resistance monitoring unit is powered by a battery, and the battery is charged by a solar charging panel.

6. The automatic grounding resistance discrimination device based on Beidou technology according to claim 1, characterized in that, Further comprising a temperature and humidity sensor, the temperature and humidity sensor is connected with the ground resistance monitoring unit, and the ground resistance monitoring unit further sends the data collected by the temperature and humidity sensor to the remote terminal through the wireless communication module.

7. The automatic grounding resistance discrimination device based on Beidou technology according to claim 1, characterized in that, The wireless communication module further sends the monitoring data of the ground resistance monitoring unit to the remote terminal by the way of 4G or 5G communication.

8. The automatic grounding resistance discrimination device based on Beidou technology according to claim 7, characterized in that, The wireless communication module further has a signal strength monitoring unit built-in, for monitoring the stability of 4G / 5G signal and Beidou RDSS signal in real time, when the signal strength of the current communication mode is lower than the preset threshold, automatically switch to another communication mode.

9. The automatic grounding resistance discrimination device based on Beidou technology according to claim 1, characterized in that, The remote terminal further has a historical data storage and multi-dimensional analysis module, stores the ground resistance monitoring data according to time period and monitoring area grouping, and generates a resistance change trend curve.

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