Ground line, ground line signal detection method and system
By using a harmonic generator and detector on the grounding wire to monitor its status in real time, the problems of false alarms and low efficiency in existing grounding wire monitoring systems are solved, and high-accuracy anomaly detection is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGDONG POWER GRID CO LTD
- Filing Date
- 2022-06-16
- Publication Date
- 2026-06-02
AI Technical Summary
Existing grounding wire monitoring systems suffer from false alarms, are unable to detect grounding wire anomalies in real time, and have low detection efficiency and accuracy, resulting in the inability to detect theft or damage of grounding wires in a timely manner.
A grounding wire harmonic generator and detector are used to generate and detect harmonic signals on the grounding wire through electromagnetic induction. Combined with the grounding wire terminal equipment, real-time monitoring is achieved to determine whether the harmonic signal is the target signal, thereby judging the grounding wire status.
It enables real-time monitoring of the grounding wire's status, improves alarm accuracy and precision, promptly detects abnormal grounding wire conditions, and prevents accidents from occurring.
Smart Images
Figure CN114924120B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-voltage cable operation and maintenance technology, and in particular to a grounding wire, a grounding wire signal detection method and system. Background Technology
[0002] High-voltage cables with voltage levels of 110 kV and above are generally single-core cables, and their metal shielding sheaths typically employ cross-interconnected grounding or single-end direct grounding. When the grounding system is intact, the induced voltage on the surface of the metal shielding sheath is only tens of volts. However, when an anomaly occurs in the grounding system, such as the theft or damage of the grounding wire, the induced voltage on the surface of the metal shielding sheath will rise to several hundred volts. If this is not detected and addressed promptly, it can lead to the outer sheath burning through or the sheath protector burning out, and in severe cases, even cause a breakdown of the cable's main insulation.
[0003] Currently, for the theft and damage maintenance of grounding wires, human infrared detectors, access control devices, and cameras are commonly used for security monitoring. However, there are still problems such as infrared detectors not having a whitelist function, resulting in false alarms, alarms only being triggered after the grounding wire is damaged, and the inability to trigger alarms when the power is off for maintenance because there is no voltage or current in the grounding wire. Summary of the Invention
[0004] This invention provides a grounding wire, a grounding wire signal detection method and system, so as to achieve the effect of real-time monitoring of the working status of the grounding wire and timely detection of abnormal grounding wire conditions.
[0005] According to one aspect of the present invention, a grounding wire is provided, the grounding wire comprising: a grounding wire body, a protective grounding box, a direct grounding box, a grounding wire harmonic generator, a grounding wire harmonic detector, and a grounding wire terminal device;
[0006] Among them, the grounding wire harmonic generator is set on the far-ground side and near-ground side of the protector in the protective grounding box, and is used to generate target harmonic signals in the grounding wire body through electromagnetic induction;
[0007] The grounding wire harmonic detector is installed on the near-ground side of the protective grounding box and the near-ground side of the direct grounding box. It is used to collect harmonic signals on the grounding wire body and determine whether the harmonic signal is the target harmonic signal based on the frequency of the harmonic signal.
[0008] The grounding terminal equipment is installed inside the protective grounding box and the direct grounding box. It is used to collect grounding abnormality information and send the grounding abnormality information to the target user.
[0009] According to another aspect of the present invention, a grounding wire signal detection method is provided, the method comprising:
[0010] Based on the grounding wire harmonic generator, a first target harmonic signal is generated, wherein the frequency of the first target harmonic signal is less than or greater than the power grid frequency;
[0011] During the transmission of the first target harmonic signal through the grounding wire, the presence of the target harmonic signal is detected based on the grounding wire harmonic detector.
[0012] If so, then the grounding wire is confirmed to be in a normal state;
[0013] If not, then the grounding wire is determined to be in an abnormal state and an alarm is triggered.
[0014] According to another aspect of the present invention, a grounding wire signal detection system is provided, the system comprising: a grounding wire harmonic generator, a grounding box harmonic detector, and a grounding wire termination device, wherein,
[0015] The grounding wire harmonic generator is installed on the far-ground side and near-ground side of the protector in the protective grounding box to generate the first harmonic signal.
[0016] The grounding wire harmonic detector is installed on the near-ground side of the protective grounding box and the near-ground side of the direct grounding box. It is used to collect harmonic signals on the grounding wire and determine whether the harmonic signal is the first harmonic signal.
[0017] Grounding wire terminal equipment is installed inside the protective grounding box and the direct grounding box, and is used to collect grounding wire abnormality information and send the grounding wire abnormality information to the target user.
[0018] The technical solution of this invention provides a grounding wire, including a grounding wire body, a protective grounding box, and a direct grounding box, and further includes: a grounding wire harmonic generator, a grounding wire harmonic detector, and a grounding wire terminal device; wherein, the grounding wire harmonic generator is disposed on the far-ground side and near-ground side of the protector in the protective grounding box, and is used to generate a first harmonic signal in the grounding wire body through electromagnetic induction; the grounding wire harmonic detector is disposed on the near-ground side of the protective grounding box and the near-ground side of the direct grounding box, and is used to collect the harmonic signal on the grounding wire body, and determine whether the harmonic signal is the first harmonic signal based on the frequency of the harmonic signal; the grounding wire terminal device is disposed inside the protective grounding box and the direct grounding box, and is used to collect grounding wire abnormal information and send the grounding wire abnormal information to the target user, which solves the problems of existing technologies that can only alarm after the grounding wire is damaged, are easily affected by the external environment, and have low detection efficiency and accuracy, and realizes the effect of real-time monitoring of the working status of the grounding wire and timely detection of grounding wire abnormalities, achieving the technical effect of high alarm accuracy and high alarm precision.
[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of a grounding wire according to Embodiment 1 of the present invention;
[0022] Figure 2 This is a flowchart of a grounding wire signal detection method according to Embodiment 2 of the present invention;
[0023] Figure 3 This is a schematic diagram of a grounding wire signal detection system provided in Embodiment 3 of the present invention. Detailed Implementation
[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.
[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0026] Example 1
[0027] Figure 1The present invention provides a schematic diagram of the structure of a grounding wire in Embodiment 1. This embodiment can be applied to detect harmonic signals on the grounding wire to determine whether the grounding wire has been damaged. The grounding wire includes: grounding wire body 1, protective grounding box 2, direct grounding box 3, grounding wire harmonic generator 4, grounding box harmonic detector 5, and grounding wire terminal equipment 6.
[0028] Among them, the grounding wire harmonic generator 4 is installed on the far-ground side and near-ground side of the protector in the protective grounding box 2, and is used to generate the first harmonic signal of the grounding wire body 1 through electromagnetic induction; the grounding wire harmonic detector 5 is installed on the near-ground side of the protective grounding box 2 and the near-ground side of the direct grounding box 3, and is used to collect the harmonic signal on the grounding wire body 1, and determine whether the harmonic signal is the first harmonic signal based on the frequency of the harmonic signal; the grounding wire terminal device 6 is installed inside the protective grounding box 2 and the direct grounding box 3, and is used to collect grounding wire abnormal information and send the grounding wire abnormal information to the target user.
[0029] In this embodiment, the grounding wire body 1 can be understood as a wire directly connected to the earth, also known as a safety return wire, which can directly transfer high voltage to the earth in case of danger. The grounding wire body 1 can be made of bare copper flexible wire of 25 square millimeters or more. The grounding box can be understood as a device that stores the grounding wire and protects it. The grounding box includes, but is not limited to, the protective grounding box 2 and the direct grounding box 3. The protective grounding box 2 can be understood as a grounding box with a cable sheath protector installed inside. It contains the cable sheath protector, connecting copper busbars, and copper terminals, etc., mainly to prevent the formation of circulating currents or excessively high induced voltages between the cable sheath and the metal protective layer. In practical applications, the protective grounding box 2 is mostly used at the multi-segment sections of long-distance coaxial cables. The direct grounding box 3 can be understood as a cable sheath direct grounding box, containing connecting copper busbars and copper terminals, etc., for the direct grounding of the cable sheath. Generally, the direct grounding box 3 is used at the front end of the segmented cable, and the protective grounding box 2 is used at the rear end.
[0030] In this embodiment, the grounding wire harmonic generator 4 refers to an instrument capable of generating various voltage and current waveforms other than sine waves. The grounding wire harmonic generator 4 is installed on the near-ground side and far-ground side of the protector in the protective grounding box 2 located on the grounding wire body 1, and is used to generate a first harmonic signal on the grounding wire body through electromagnetic induction. The first harmonic signal can be understood as a signal with a harmonic frequency within a certain range, for example, a signal with a harmonic frequency greater than the grid frequency. The grounding wire harmonic detector 5 can be understood as an instrument for monitoring harmonic energy in a power system. The grounding wire harmonic detector 5 is respectively installed on the near-ground side of the protective grounding box 2 and the near-ground side of the direct grounding box 3 located on the grounding wire body 1, and is used to collect harmonic signals on the grounding wire body 1, determine the frequency of the currently collected harmonic signal, and determine whether the currently collected harmonic signal is the first harmonic signal based on that frequency.
[0031] It should be noted that when the voltage or current waveform in the power grid is a non-ideal sine wave, it means that it contains voltage or current components with a frequency higher than 50 Hz. These current or voltage components with a frequency higher than 50 Hz can be called harmonics.
[0032] In this embodiment, the grounding wire terminal device 6 can be understood as a grounding wire abnormality processing device. For example, the grounding wire terminal device 6 may include, but is not limited to, a central processing unit and a communication unit, etc., and this embodiment does not specifically limit this. The grounding wire terminal device 6 can be installed inside the protective grounding box and the direct grounding box, used to collect grounding wire abnormality information and send the collected abnormality information to the target user.
[0033] It should also be noted that in high-voltage cable power systems, to prevent the magnetic field generated by a single-phase ground fault current from severely affecting the outside environment, a low-impedance insulated conductor can be laid parallel to the existing cable line and grounded at both ends. This insulated conductor can be called a return conductor, also known as a shielding conductor. Based on this, the above technical solution also includes: a return conductor 7, a return conductor harmonic generator 8, and a return conductor harmonic detector 9; wherein, the return conductor harmonic generator 8 is set on either near-ground side of the return conductor 7 and is used to generate a second harmonic signal in the return conductor 7 through electromagnetic induction; the return conductor harmonic detector 9 is set on the other near-ground side of the return conductor and is used to collect the harmonic signals on the return conductor and determine whether the harmonic signal is a second harmonic signal based on the frequency of the harmonic signal.
[0034] In this embodiment, the return line harmonic generator can be understood as an instrument installed on the return line for generating various voltage and current waveforms other than sine waves. The return line harmonic detector can be understood as an instrument installed on the return line for monitoring harmonic energy in a power system.
[0035] Generally, grounding wire harmonic generators and grounding wire harmonic detectors are installed in pairs on the grounding wire; similarly, return line harmonic generators and return line harmonic detectors are also installed in pairs on the return line.
[0036] The technical solution of this invention provides a grounding wire, including a grounding wire body, a protective grounding box, and a direct grounding box, and further includes: a grounding wire harmonic generator, a grounding wire harmonic detector, and a grounding wire terminal device; wherein, the grounding wire harmonic generator is disposed on the far-ground side and near-ground side of the protector in the protective grounding box, and is used to generate a first harmonic signal in the grounding wire body through electromagnetic induction; the grounding wire harmonic detector is disposed on the near-ground side of the protective grounding box and the near-ground side of the direct grounding box, and is used to collect the harmonic signal on the grounding wire body, and determine whether the harmonic signal is the first harmonic signal based on the frequency of the harmonic signal; the grounding wire terminal device is disposed inside the protective grounding box and the direct grounding box, and is used to collect grounding wire abnormal information and send the grounding wire abnormal information to the target user, which solves the problems of existing technologies that can only alarm after the grounding wire is damaged, are easily affected by the external environment, and have low detection efficiency and accuracy, and realizes the effect of real-time monitoring of the working status of the grounding wire and timely detection of grounding wire abnormalities, achieving the technical effect of high alarm accuracy and high alarm precision.
[0037] Example 2
[0038] Figure 2 This is a flowchart of a grounding wire signal detection method provided in Embodiment 2 of the present invention. This embodiment is applicable to detecting harmonic signals on a grounding wire to determine whether the grounding wire has been damaged. This method can be executed by a grounding wire signal detection system. Figure 2 As shown, the method includes:
[0039] S210, Based on the grounding wire harmonic generator, generates the first harmonic signal.
[0040] The frequency of the first target harmonic signal is less than or greater than the grid frequency. For example, the grid frequency could be 50 Hz, in which case the first harmonic signal would be a signal with a frequency greater than or less than 50 Hz. In this embodiment, the first harmonic signal can be a harmonic signal that is easily detected by a harmonic detector.
[0041] In practical applications, in order to monitor the grounding wire and detect abnormalities in a timely manner, the signal on the grounding wire can be detected to determine its condition. Based on this, a grounding wire harmonic generator can be installed on the grounding wire. By activating the grounding wire harmonic generator, corresponding harmonic signals are generated and transmitted on the grounding wire.
[0042] Optionally, generating a first harmonic signal based on a grounding wire harmonic generator includes: generating a target electromotive force when the grounding wire harmonic generator is started, so as to generate a changing magnetic field based on the target electromotive force; and generating the first harmonic signal based on the changing magnetic field.
[0043] The target electromotive force (EMF) can be understood as a physical quantity reflecting the ability of a power source to convert other forms of energy into electrical energy. In this embodiment, the target EMF can be an induced EMF, i.e., an EMF generated in electromagnetic induction, with its direction from low potential to high potential. The target EMF can generate a voltage across the power source. A changing magnetic field can be understood as a magnetic field whose strength and direction are constantly changing.
[0044] Specifically, when the grounding harmonic generator is started, a portion of the conductors in the closed circuit will move relative to the magnetic field, generating a target electromotive force. Furthermore, since the target electromotive force is continuously changing, a changing magnetic field with a constantly changing magnetic field strength and direction will be generated based on the electromagnetic induction phenomenon. Finally, the first harmonic signal will be generated based on the changing magnetic field.
[0045] S220. During the transmission of the first harmonic signal through the grounding wire, the presence of the first harmonic signal is detected based on the grounding wire harmonic detector.
[0046] Under normal circumstances, after the grounding box harmonic generator is started, the first harmonic signal generated will be transmitted on the grounding wire. The grounding wire harmonic detector set at the other end of the grounding wire under test determines whether the first target harmonic signal has been transmitted, so as to determine whether there is any abnormality in this section of the grounding wire.
[0047] Optionally, detecting the presence of the first harmonic signal based on a grounding wire harmonic detector includes: acquiring harmonic signals on the grounding wire based on the grounding wire harmonic detector, and determining the frequency of the harmonic signals to determine whether the harmonic signals are the first harmonic signals.
[0048] Specifically, when the grounding wire harmonic generator is started, the grounding wire harmonic detector is also started. During the transmission of the first harmonic signal on the grounding wire, the harmonic signal on the grounding wire is collected by the grounding wire harmonic detector set at the other end of the grounding wire, and the frequency of the collected harmonic signal is determined. The frequency is used to determine whether the harmonic signal is the first harmonic signal. If it is, S230 is executed; otherwise, S240 is executed.
[0049] It should be noted that during the transmission of the first harmonic signal, there may be other electromagnetic signals generated when the cable circuit transmits power on the grounding wire. Therefore, after the grounding wire harmonic detector collects the harmonic signal on the grounding wire, it is also necessary to detect its corresponding frequency and determine whether it is the first harmonic signal based on the frequency.
[0050] It should also be noted that both the grounding wire harmonic generator and the grounding wire harmonic detector are two independent semi-circular ring structures, which are connected together based on the grounding wire.
[0051] S230. Confirm that the grounding wire is in normal condition.
[0052] In practice, when the grounding wire harmonic detector collects harmonic signals on the grounding wire and determines that the frequency of the harmonic signal is the same as the frequency of the first harmonic signal, it can be determined that the grounding wire harmonic detector has collected the first harmonic signal generated by the grounding wire harmonic generator. Therefore, it can be determined that the grounding wire from the grounding wire harmonic generator to the grounding wire harmonic detector is in a normal state, that is, the grounding wire has not been damaged and there has been no theft of the grounding wire.
[0053] S240. Determine that the grounding wire is in an abnormal state and issue an alarm.
[0054] In practical implementation, when the grounding wire harmonic detector collects harmonic signals on the grounding wire, and determines that the harmonic signal is not the first harmonic signal by judging its frequency, or when the grounding wire harmonic detector does not collect a harmonic signal within a preset time period, it can be determined that the grounding wire from the grounding wire harmonic generator to the grounding box harmonic detector is in an abnormal state, that is, the grounding wire is broken and is in an imperfect state. After detecting this abnormal state, a grounding wire abnormality alarm will be issued.
[0055] Optionally, determining that the grounding wire is in an abnormal state and issuing an alarm includes: when the grounding wire harmonic detector detects an abnormal signal in the harmonic signal on the grounding wire, sending the abnormal signal to the grounding wire terminal device; and based on the grounding wire terminal device and the abnormal signal, determining the grounding wire abnormal information and sending it to the target user to issue an alarm.
[0056] In this embodiment, an abnormal signal can be understood as a signal whose frequency differs from that of the first harmonic signal. For example, an abnormal signal may include, but is not limited to, signals whose frequency is less than or greater than that of the first harmonic signal. The grounding wire information can reflect an abnormal state of the grounding wire. For example, the grounding wire abnormal information may include the location of the abnormal grounding wire and the cause of the abnormality. In this embodiment, the target user can be power system maintenance personnel.
[0057] Specifically, when an abnormal harmonic signal is detected on the grounding wire by the grounding wire harmonic detector, the detected abnormal signal is sent to the grounding wire terminal equipment. The grounding wire terminal equipment then analyzes the abnormal signal to generate grounding wire abnormality information. This information is then sent to the target user, allowing the user to determine the specific location of the abnormal grounding wire based on the information displayed. This enables rapid repair and prevents more serious accidents from occurring.
[0058] It should be noted that if the transmission cable also includes a return line, damage to the return line can also lead to a serious power accident. Therefore, in addition to the above technical solution, the following steps are also included: determining whether a return line associated with the grounding wire exists; if so, generating a second harmonic signal based on a return line harmonic generator; during the transmission of the second harmonic signal on the return line, detecting whether the second harmonic signal exists based on a return line harmonic detector; if so, determining that the return line is in a normal state; if not, determining that the return line is in an abnormal state and issuing an alarm.
[0059] In this embodiment, the second harmonic signal can be understood as a signal with a harmonic frequency within a certain range. It should be noted that the first harmonic signal and the second harmonic signal can be the same harmonic signal or different harmonic signals; this embodiment does not specifically limit this.
[0060] Specifically, it is determined whether there is a return line associated with the grounding wire around the grounding wire being tested. If so, a second harmonic signal is generated by a return line harmonic generator installed on the return line. Further, during the transmission of the second harmonic signal on the return line, a return line harmonic detector installed at the other end of the return line collects the harmonic signal on the return line. Based on the frequency of the collected harmonic signal, it is determined whether the harmonic signal is the second harmonic signal. If it is, the return line from the return line harmonic generator to the return line harmonic detector is determined to be in a normal state. If not, the return line is determined to be in an abnormal state, and the return line abnormality information is sent to the grounding wire terminal to realize an alarm.
[0061] It should be noted that the working principle of the return line harmonic generator is the same as that of the grounding wire harmonic generator; the working principle of the return line harmonic detector is the same as that of the grounding wire harmonic generator.
[0062] It should also be noted that both the return line harmonic generator and the return line harmonic detector are two independent semi-circular ring structures, which are connected together based on the return line.
[0063] The technical solution of this invention generates a first harmonic signal based on a grounding wire harmonic generator. Further, during the transmission of the first harmonic signal through the grounding wire, a grounding wire harmonic detector detects the presence of the first harmonic signal. If the first harmonic signal is present, the grounding wire is determined to be in a normal state; otherwise, it is determined to be in an abnormal state and an alarm is triggered. This solves the problems of existing technologies, such as the ability to alarm only after the grounding wire is damaged, susceptibility to external environmental influences, low detection efficiency, and low detection accuracy. It achieves real-time monitoring of the grounding wire's working status and timely detection of grounding wire abnormalities, resulting in high alarm accuracy and precision.
[0064] Example 3
[0065] Figure 3 This is a schematic diagram of a grounding wire signal detection system provided in Embodiment 3 of the present invention. Figure 3 As shown, the device includes: a grounding wire harmonic generator 310, a grounding wire harmonic detector 320, and a grounding wire terminal device 330.
[0066] Among them, the grounding wire harmonic generator 310 is installed on the far-ground side and near-ground side of the protector in the protective grounding box, and is used to generate the first harmonic signal;
[0067] The grounding wire harmonic detector 320 is installed on the near-ground side of the protective grounding box and the near-ground side of the direct grounding box to collect harmonic signals on the grounding wire and determine whether the harmonic signal is the first harmonic signal.
[0068] The grounding terminal device 330 is installed inside the protective grounding box and the direct grounding box. It is used to collect grounding abnormality information and send the grounding abnormality information to the target user.
[0069] The technical solution of this invention generates a first harmonic signal based on a grounding wire harmonic generator. Further, during the transmission of the first harmonic signal through the grounding wire, a grounding wire harmonic detector detects the presence of the first harmonic signal. If the first harmonic signal is present, the grounding wire is determined to be in a normal state; otherwise, it is determined to be in an abnormal state and an alarm is triggered. This solves the problems of existing technologies, such as the ability to alarm only after the grounding wire is damaged, susceptibility to external environmental influences, low detection efficiency, and low detection accuracy. It achieves real-time monitoring of the grounding wire's working status and timely detection of grounding wire abnormalities, resulting in high alarm accuracy and precision.
[0070] The grounding wire signal detection system provided in this embodiment of the invention can execute the grounding wire signal detection method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.
Claims
1. A grounding wire, comprising a grounding wire body, a protective grounding box, and a direct grounding box, characterized in that, include: Grounding wire harmonic generator, grounding wire harmonic detector, and grounding wire terminal equipment; The grounding wire harmonic generator is located on the far-ground side and near-ground side of the protector in the protective grounding box, and is used to generate a first harmonic signal in the grounding wire body through electromagnetic induction. The grounding wire harmonic detector is installed on the near-ground side of the protective grounding box and the near-ground side of the direct grounding box, and is used to collect harmonic signals on the grounding wire body, and determine whether the harmonic signal is the first harmonic signal based on the frequency of the harmonic signal; The grounding wire terminal device is installed inside the enclosure of the protective grounding box and the enclosure of the direct grounding box, and is used to collect grounding wire abnormality information and send the grounding wire abnormality information to the target user.
2. The grounding wire according to claim 1, characterized in that, Also includes: Return line, return line harmonic generator, and return line harmonic detector; The return line harmonic generator is located on any near-ground side of the return line and is used to generate a second harmonic signal through electromagnetic induction. The return line harmonic detector is located on the other near-ground side of the return line and is used to collect harmonic signals on the return line and determine whether the harmonic signal is the second harmonic signal based on the frequency of the harmonic signal.
3. A grounding wire signal detection method, used to control the grounding wire as described in any one of claims 1-2, characterized in that, include: Based on the grounding wire harmonic generator, a first harmonic signal is generated, wherein the frequency of the first harmonic signal is less than or greater than the power grid frequency; During the transmission of the first harmonic signal through the grounding wire, the presence of the first harmonic signal is detected based on the grounding wire harmonic detector. If so, then the grounding wire is determined to be in a normal state; If not, the grounding wire is determined to be in an abnormal state and an alarm is triggered.
4. The method according to claim 3, characterized in that, The grounding wire-based harmonic generator generates a first harmonic signal, including: When the grounding wire harmonic generator is started, a target electromotive force is generated to generate a changing magnetic field based on the target electromotive force; The first harmonic signal is generated based on the changing magnetic field.
5. The method according to claim 3, characterized in that, The grounding wire harmonic detector detects the presence of the first harmonic signal, including: Based on the grounding wire harmonic detector, the harmonic signal on the grounding wire is acquired, and the frequency of the harmonic signal is determined to determine whether the harmonic signal is the first harmonic signal.
6. The method according to claim 3, characterized in that, The step of determining that the grounding wire is in an abnormal state and issuing an alarm includes: When the grounding wire harmonic detector detects an abnormal signal in the harmonic signal on the grounding wire, it sends the abnormal signal to the grounding wire terminal device. Based on the grounding terminal device and the abnormal signal, the grounding abnormality information is determined and sent to the target user for alarm purposes.
7. The method according to claim 3, characterized in that, The grounding wire harmonic generator and the grounding wire harmonic detector are both two independent semi-circular ring structures, which are connected together based on the grounding wire.
8. The method according to claim 3, characterized in that, Also includes: Determine whether a return line associated with the grounding wire exists on the grounding wire; If so, a second harmonic signal is generated based on the return line harmonic generator, and during the transmission of the second harmonic signal on the return line, the presence of the second harmonic signal is detected based on the return line harmonic detector. If so, then the return line is determined to be in a normal state; If not, then the return line is determined to be in an abnormal state and an alarm is issued.
9. The method according to claim 8, characterized in that, The return line harmonic generator and the return line harmonic detector are both two independent semi-circular ring structures, and are connected together based on the return line.
10. A grounding wire signal detection system, characterized in that, include: Grounding wire harmonic generator, grounding wire harmonic detector, and grounding wire terminal equipment, among which, The grounding wire harmonic generator is installed on the far-ground side and near-ground side of the protector in the protective grounding box, and is used to generate the first harmonic signal; The grounding wire harmonic detector is installed on the near-ground side of the protective grounding box and the near-ground side of the direct grounding box. It is used to collect harmonic signals on the grounding wire and determine whether the harmonic signal is the first harmonic signal. The grounding wire terminal equipment is installed inside the protective grounding box and the direct grounding box, and is used to collect grounding wire abnormality information and send the grounding wire abnormality information to the target user.