A grounding detection and location system for primary equipment in a substation

Abstract

This invention provides a grounding detection and positioning system for primary equipment in a substation, comprising a grounding detection unit mounted on a grounding tool to detect its grounding status, and a remote signaling control unit located at a grounding point. The grounding detection unit communicates with both the remote signaling control unit and a central control unit. The central control unit locates the grounding tool based on detection signals containing grounding information fed back by the grounding detection unit, determining a first grounding point. The grounding detection unit then controls the corresponding remote signaling control unit to output a remote signal, confirming a second grounding point based on the remote signal. Finally, the actual grounding point corresponding to the grounding tool is determined by combining the second and first grounding points. This invention can accurately detect the grounding status of all grounding points within a substation and precisely locate the grounding points, reducing the probability of serious electrical misoperation accidents such as energizing grounding wires or grounding vehicles.

Description

Technical Field

[0001] This invention relates to the field of grounding detection technology, and more specifically to a grounding detection and location system for primary equipment in a substation. Background Technology

[0002] The "five-prevention" devices and systems in substations are the core line of defense against misoperation of electrical equipment by maintenance personnel, and are an important means to maintain the normal and stable operation of power grid equipment and ensure the safety of workers. The widely used "five-prevention" systems in substations mainly consist of a five-prevention host, intelligent electronic keys, and coded locks. Their design principles are divided into three methods: mechanical structure interlocking, electrical circuit interlocking, and microcomputer program interlocking. Specifically, handcart-type switchgear uses a precise mechanical interlocking structure to prevent energization with the grounding switch; combined electrical equipment uses an electrical interlocking circuit between the circuit breaker and the disconnecting switch to prevent energization with the grounding switch; and the five-prevention microcomputer program verifies the correctness of the logical sequence of switching operations to prevent misoperation. However, relying solely on the grounding switches configured in the switchgear and combined electrical equipment is insufficient to meet the safety grounding range requirements for substation equipment maintenance operations. Therefore, grounding wires or grounding carts must be used for supplementary grounding. Grounding wires and grounding carts, as temporary grounding tools, cannot achieve mechanical structure interlocking or electrical circuit interlocking. The methods for preventing misoperation of grounding wires and grounding carts are relatively simple, relying solely on the open / closed status of the coded lock installed at the sealing point by the five-prevention host to determine the presence of a grounding wire or grounding cart—an indirect grounding detection method. In the specific practice of substation switching operations, factors such as the meticulousness and sense of responsibility of maintenance personnel, and the management of universal key management, can easily lead to situations where maintenance personnel have not removed the grounding wire or pulled out the grounding cart, yet the coded lock logic verification passes, resulting in the grounding wire or grounding cart being closed and energized, causing a major electrical misoperation accident. Summary of the Invention

[0003] In view of this, the problem to be solved by the present invention is to provide a grounding detection and positioning system for primary equipment in substations, which can efficiently and accurately detect the grounding status of each sealing point in the substation, and reduce serious electrical misoperation accidents such as closing the circuit with the grounding wire or grounding vehicle connected to the circuit breaker.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A grounding detection and positioning system for primary equipment in a substation includes a grounding detection unit mounted on a grounding tool to detect the grounding status of the grounding tool, and a remote signaling control unit located at a sealing point. The grounding detection unit communicates with both the remote signaling control unit and a central control unit. The central control unit incorporates a dual-confirmation detection strategy, including:

[0006] Software confirmation: Receive the detection signal containing grounding information fed back by the grounding detection unit. The indoor positioning strategy uses the signal data generated by the received detection signal to locate and determine the first sealing point that matches the grounding tool.

[0007] Hardware verification: The grounding detection unit controls the remote signaling control unit at the location of the grounding tool to operate based on the detected grounding information. The main control unit receives the corresponding remote signaling signal and determines the second sealing point matched with the grounding tool based on the remote signaling signal.

[0008] Double confirmation: Determine whether the second sealing location is consistent with the first sealing location. If yes, determine the actual grounding sealing location corresponding to the grounding tool. If no, proceed to the software confirmation step.

[0009] Furthermore, the central control unit includes a first communication module that communicates with the grounding detection unit and is located indoors. The first communication module includes several Bluetooth base stations located in the equipment room where the sealing point is located.

[0010] Furthermore, the signal data includes the signal incident angle of the Bluetooth base station receiving the detection signal;

[0011] The indoor positioning strategy includes: acquiring signal data generated when several Bluetooth base stations inside the device receive detection signals; using the Bluetooth arrival angle ranging method to determine the location of the grounding tool based on the signal data; and generating the current location containing the indoor Bluetooth base station number and indoor plane coordinates.

[0012] Furthermore, the central control unit is equipped with a positioning table that records the location information of each sealing point, which is used to match the current position of the grounding tool to determine the first sealing point.

[0013] Furthermore, the grounding detection unit includes a detection module for detecting the grounding resistance of the grounding tool and determining the grounding information in hardware form; the detection module includes a measurement point in contact with the sealing point, injecting current into the measurement point and collecting the ground voltage of the measurement point, calculating the ground resistance based on the injected current and the ground voltage, and determining the grounding status based on the ground resistance.

[0014] Furthermore, the remote signaling control unit includes a wireless relay for characterizing the location information of the sealing point, and the substation's measurement and control device includes several input contacts for receiving input information and corresponding one-to-one with the sealing point. The measurement and control device receives the remote signaling signal composed of the input contacts and the corresponding received input information, and sends it to the central control unit.

[0015] Furthermore, the grounding detection unit is equipped with a second communication module with adjustable transmission power, which is used to control the operation of the wireless relay at the location of the grounding detection unit and to communicate with the first communication module.

[0016] Furthermore, the central control unit is equipped with a substation topology model with power equipment and sealing points as nodes and connection relationships as edges. An information table is constructed based on the node numbers of sealing points and power equipment. The information table includes the location number associated with the sealing point, voltage type, and grounding tool type.

[0017] The detection signal contains the grounding tool type. The grounding tool corresponds to the actual grounding sealing point. The grounding tool type matches the information table to determine whether the grounding tool type is being used correctly.

[0018] Furthermore, the information table includes the node numbers of all incoming call devices associated with the sealing location.

[0019] Furthermore, the central control unit communicates with the five-proof host in real time via the Mod-bus communication protocol.

[0020] The beneficial effects of this invention are:

[0021] A grounding detection unit is installed on the grounding tool to detect the grounding status of the grounding tool. The grounding detection unit is equipped with a detection module that uses hardware circuitry to directly detect the ground resistance of the sealing point, and directly and accurately determine the grounding status of the sealing point. Unlike existing indirect grounding detection methods such as verifying the opening and closing status of coded locks, the accuracy and reliability of the detection are significantly improved.

[0022] The detection module and grounding tool in the grounding detection unit are designed as an integrated unit. When the grounding tool is removed (by removing the grounding wire or pulling out the grounding vehicle), the detection module and related hardware circuit structure are automatically removed simultaneously, forming an effective isolation from the sealing point. This improves the synchronization between the grounding tool and the corresponding grounding state, and reduces the possibility of misoperation accidents caused by delayed reception of the grounding state leading to the actual grounding sealing point being energized.

[0023] The remote signaling control unit (wireless relay) controls the location of the grounding tool through the grounding detection unit. The measurement and control device receives the remote signaling signal generated by the action of the wireless relay and determines the location of the second sealing point corresponding to the grounding tool based on the remote signaling signal. The second sealing point is determined quickly and accurately through hardware circuits and automated transmission without modifying the primary equipment of the substation. It ensures the safety of the power grid equipment while accurately and automatically identifying the grounding status of the sealing point, and has strong applicability.

[0024] By acquiring signal data (signal incident angle θ or Wi-Fi strength information) of the detection signal, the system locates and determines the first sealing point corresponding to the grounding tool based on the signal data. The system calculates the location of the first sealing point and continuously monitors the position of the grounding tool. Without the need for manual inspection of the status of each sealing point, the system can quickly determine the location of the grounding sealing point and upload it to the five-proof host, thereby improving the reliability of the five-proof host's anti-misoperation logic rules.

[0025] When two grounding points in the equipment room are located close to each other, it is easy to cause erroneous control of nearby remote signaling control units and inaccurate indoor positioning. By judging the consistency between the second and first grounding points, the location of the grounding point in the substation is determined through a double confirmation method. This accurately determines the actual grounding point in the substation, effectively reducing the possibility of erroneous operation accidents such as closing and energizing with grounding wires or grounding vehicles, and significantly reducing the probability of misjudging the actual grounding point.

[0026] A table containing all incoming power node numbers (electrical equipment) associated with the sealing point is set up. By uploading the electrical equipment on the incoming power side of the actual grounding sealing point to the five-prevention host, the probability of accidents caused by closing the circuit and supplying power to the actual grounding sealing point is reduced, effectively reducing the probability of major electrical misoperation accidents. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a flowchart of a dual-confirmation detection strategy for a grounding detection and positioning system for primary equipment in a substation, according to the present invention.

[0029] Figure 2 This is a structural diagram of a grounding detection and location system for primary equipment in a substation according to the present invention.

[0030] Figure 3 This is a schematic diagram of the base station layout for a grounding detection and positioning system for primary equipment in a substation according to the present invention.

[0031] Figure 4 This invention relates to a positioning table for a grounding detection and positioning system for primary equipment in a substation.

[0032] Figure 5 This is a substation topology model example diagram of a grounding detection and location system for primary equipment in a substation according to the present invention;

[0033] Figure 6 This invention relates to an information table for a grounding detection and location system for primary equipment in a substation.

[0034] Figure 7 This invention relates to a measurement and control meter for a grounding detection and positioning system for primary equipment in a substation.

[0035] Figure 8 This is a schematic diagram of the connection of a grounding vehicle at a sealed point in a grounding detection and positioning system for primary equipment in a substation according to the present invention;

[0036] Figure 9 This is a schematic diagram of the connection of the grounding wire at the sealing point of a grounding detection and positioning system for primary equipment in a substation according to the present invention. Detailed Implementation

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 are within the scope of protection of the present invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed terms.

[0039] This invention provides a grounding detection and location system for primary equipment in a substation, such as... Figure 1 and Figure 2 As shown, it includes a grounding detection unit installed on the grounding tool to detect the grounding status, and a remote signaling control unit installed at the sealing point. The grounding detection unit communicates with the main control unit and the remote signaling control unit respectively.

[0040] The grounding status includes grounded information indicating that the sealing point is grounded and ungrounded information indicating that the sealing point is not grounded. The operation process of the grounding detection system is as follows: the central control unit determines the first sealing point corresponding to the grounding position of the grounding tool based on the detection signal containing grounded information fed back by the grounding detection unit; the grounding detection unit controls the remote signaling control unit at the corresponding location of the grounding tool to operate based on the detected grounded information, and receives the remote signaling signal indicating the operation status of the remote signaling control unit, determines the second sealing point corresponding to the location of the grounding tool based on the remote signaling signal, and matches the second sealing point and the first sealing point to jointly determine the actual grounding sealing point corresponding to the grounding tool.

[0041] like Figure 3 As shown, the central control unit includes a first communication module that communicates with the grounding detection unit and is used for indoor positioning. The first communication module includes several Bluetooth base stations installed in the indoor space of each device at the sealed location, which can improve the accuracy of indoor positioning.

[0042] Indoor communication includes: when the grounding tool enters the equipment room where the sealing point is located, the grounding detection unit on the grounding tool sends a detection signal, and the Bluetooth base station in the equipment room receives the detection signal, realizing fast and efficient communication between the grounding tool in any room and the central control unit, which facilitates the central control unit to continuously monitor the position of the grounding tool.

[0043] The central control unit is equipped with a dual-confirmation detection strategy, which includes software confirmation: receiving a detection signal containing grounding information from the grounding detection unit, and an indoor positioning strategy that uses the signal data generated by the received detection signal to determine the first sealing point that matches the grounding tool.

[0044] The central control unit is equipped with a positioning module to determine the indoor location of the grounding tool. The positioning module is used to run an indoor positioning strategy, including: when the grounding detection unit communicates with the central control unit, the Bluetooth base station, in addition to receiving the detection signal, also obtains the signal incident angle θ when the Bluetooth base station receives the detection signal and generates the signal data of the detection signal; there are no fewer than two Bluetooth base stations installed in the equipment room, and the Bluetooth angle of arrival ranging method calculates the indoor plane coordinates of the grounding tool based on the signal data of several Bluetooth base stations in the same equipment room, and generates the current position including the indoor Bluetooth base station number and the indoor plane coordinates.

[0045] One embodiment of this application is: the grounding detection unit continuously sends a detection signal so that the central control unit can monitor the real-time position of the grounding tool; or the central control unit controls the grounding detection unit to send a detection signal, saving power consumption of the grounding detection unit while allowing the position of the grounding tool to be obtained at any time.

[0046] like Figure 3 As shown, the substation includes a main transformer room, a switch room, a grounding transformer room, and a tool room. Each of the main transformer room, switch room, and grounding transformer room is equipped with at least two base stations. The tool room is used to house the central control unit and store grounding tools that are not in use throughout the station. One embodiment of this application describes a grounding tool that includes a grounding wire and a grounding cart.

[0047] The Bluetooth angle of arrival ranging method includes: based on the signal incident angle θ of at least two Bluetooth base stations, the two-dimensional plane coordinates of the grounding tool are calculated by triangulation. The Bluetooth base station number in the equipment room and the two-dimensional plane coordinates together constitute the current position of the grounding tool in the equipment room.

[0048] like Figure 4 As shown, the central control unit contains a positioning table recording the location information of each sealing point. The positional relationship between the central control unit and the substation sealing points 1, 2, ..., 10 is defined as position 1, position 2, ..., position 10, respectively. The indoor positioning strategy calculates the current position of the grounding tool when it is grounded, and matches the current position with the positioning table to determine the first sealing point corresponding to the grounding tool when it is grounded. In one embodiment of this application: when the grounding status is "grounded", the positioning module continuously calculates the current position of the grounding tool based on the detection signal and continuously matches it with the positioning table until a match is successful to determine the first sealing point; when the grounding status is "ungrounded", only the position of the grounding tool is monitored.

[0049] One embodiment of this application is as follows: The positioning table has a minimum distance threshold M between the positioning tool and the central control unit (intelligent management terminal). When the positioning distance between all grounding tools and the central control unit is less than M, it means that all grounding tools in the substation are completely collected and there are no missing grounding tools in each equipment area, and all sealing points are in an ungrounded state. If there is one or more grounding tools whose positioning distance from the central control unit is greater than M, it means that a grounding tool may be in use, and a double confirmation detection strategy is executed.

[0050] Matching method between the positioning table and the current position of the grounding tool: Calculate the distance between the current position of the grounding tool and the sealing point, and determine whether the distance value is less than the distance threshold. If not, it means that the distance between the grounding tool and the sealing point is too far, and the sealing point cannot be grounded, so the matching is unsuccessful. If yes, it means that the distance between the grounding tool and the sealing point is too close, and the sealing point is grounded, so the matching is successful.

[0051] Signal data generation method: The Bluetooth base station includes an antenna array consisting of several antennas. The signal phase difference φ when different antennas receive the detection signal is obtained based on I / Q sampling. Combined with the antenna spacing d and the signal wavelength λ, the signal incident angle θ of the detection signal on different antennas is determined.

[0052] like Figure 5 As shown, the main control unit contains a substation topology model with power equipment and sealing points as nodes and connection relationships as edges. In the substation topology model, sealing point numbers are Sealing Point 1, Sealing Point 2, ..., Sealing Point 10; R1, R2, R3, R4, R5, R6, TV01, and TV02 represent 35kV equipment numbers; R21, R22, R23, R24, R25, R26, R27, R28, TV03, and TV04 represent 10kV equipment numbers; TV1 and TV11 represent the numbers of main transformer No. 1 and grounding transformer No. 1, respectively; TV2 and TV22 represent the numbers of main transformer No. 2 and grounding transformer No. 2, respectively; K1~K8 represent the numbers of the grounding switches of the switchgear.

[0053] like Figure 6 As shown, the central control unit constructs an information table based on the node numbers of the sealing points and power equipment in the substation topology model. The information table includes the location number associated with the sealing point (sealing location), all incoming power side node numbers (logical rules), voltage type (voltage level), and grounding tool type (grounding tool).

[0054] The substation's sealing points are distinguished by location number. The type of grounding tool used at each sealing point is verified to ensure its compliance. When a sealing point is already grounded, the electrical equipment currently not permitted to be operated is determined based on the numbers of all incoming power nodes at that sealing point. This information is uploaded to the five-prevention host and incorporated into the anti-misoperation interlocking logic algorithm, prohibiting remote control operation from the monitoring backend and local unlocking of coded locks, effectively reducing the probability of electrical misoperation accidents. One embodiment of this application is as follows: when a sealing point within the substation is detected to have returned to an ungrounded state, the five-prevention host re-enables the operation permission logic for each incoming power device number at that sealing point, ensuring the rigor and reliability of the anti-misoperation interlocking logic algorithm.

[0055] The detection signal fed back by the grounding detection unit includes the grounding tool type and grounding status. By matching the grounding tool type and actual grounding location sent by the grounding tool with the information table, it can be verified whether the grounding tool is used correctly when the location is grounded. When a location is already grounded, the information table can be used to determine the numbers of all power-on equipment on the power supply side that are not allowed to be operated and are associated with that location. In one embodiment of this application, the detection signal may also include the ID of the grounding tool for easy identification of the grounding tool.

[0056] The grounding detection unit includes a detection module for directly detecting the grounding resistance of the grounding tool to determine the grounding status. The detection module includes a measurement point in contact with the sealing point. Current is injected into the measurement point, and the voltage to ground at the measurement point is collected. The grounding resistance is calculated based on the injected current and the voltage to ground at the measurement point. The resistance measurement method is a direct test of whether the sealing point is grounded, and it is more accurate than indirect testing methods that rely on coded locks.

[0057] One embodiment of this application is as follows: generating grounding status information includes obtaining the ground resistance value of a measurement point on the grounding tool, determining whether the ground resistance value is less than a resistance threshold, and if so, generating grounded information; otherwise, generating ungrounded information.

[0058] Hardware verification: The system receives a detection signal containing grounding information from the grounding detection unit. The indoor positioning strategy uses the signal data generated by the received detection signal to determine the first sealing point that matches the grounding tool.

[0059] Because Bluetooth positioning has a certain error (within the range of 0.5M to 1M), to avoid affecting the accuracy of the actual grounding location determination due to positioning errors, a remote signaling control unit is set up at the grounding location. The remote signaling control unit includes a wireless relay for wireless control. The detection signal emitted by the grounding detection unit controls the wireless relay contacts located at the current grounding location to conduct. The measurement and control device in the substation receives the input change information representing the location information of the grounding location. When the wireless relay at a certain grounding location does not operate (contacts open), the measurement and control device receives the input as 0, which corresponds to the grounding location being in an ungrounded state; when the wireless relay at a certain grounding location operates (contacts closed), the measurement and control device receives the input as 1, which corresponds to the grounding location being in a grounded state.

[0060] like Figure 8 As shown, the grounding circuit structure of sealing point 1 is as follows: when the grounding vehicle is pushed into the "grounding" position of TV01 switchgear, its moving contact and grounding terminal are reliably connected to the 35kV busbar side stationary contact and grounding stake in the switchgear, respectively, so as to realize the reliable grounding of sealing point 1.

[0061] like Figure 9 As shown, the grounding circuit structure of sealing point 4 is as follows: when the grounding wire is suspended from the copper busbar connecting the lead wire of the 10kV side of the No. 1 main transformer, the grounding part of the grounding wire is reliably connected to the grounding pile of the No. 1 main transformer room, so as to realize the reliable grounding of sealing point 4.

[0062] The substation's monitoring and control device includes several input contacts that receive input quantities and correspond one-to-one with the sealing point. The monitoring and control device receives the remote signaling signal composed of the input contacts and input quantities and sends it to the central control unit. The central control unit receives the remote signaling signal when the wireless relay closes and determines the second sealing point and grounding status based on the input contacts and input quantities.

[0063] like Figure 7 As shown, the central control unit is equipped with a measurement and control table that records the input values ​​when each sealing point is grounded. The input contacts of the wireless relay-associated measurement and control device at sealing point 1, sealing point 2, ..., sealing point 10 are defined as input 1, input 2, ..., input 10, respectively. The input values ​​include input contact information and input quantity information. The measurement and control table determines the second sealing point and grounding status of the grounding tool by matching with the remote signaling signal.

[0064] The grounding detection unit is equipped with a wireless communication module with adjustable transmission power. The signal coverage range is adjusted based on the transmission power of the wireless communication module. When the wireless communication module outputs a detection signal, it transmits a high-power Bluetooth signal to cover the entire equipment room, facilitating communication and positioning. When the wireless communication module outputs a control signal, it transmits a low-power Bluetooth signal to cover a smaller area, allowing control only of the wireless relay at the sealing point where the grounding tool is located.

[0065] One embodiment of this application is: the coverage range of the low-power Bluetooth signal is smaller than the error range of the indoor positioning strategy, which can be 0.5M, and is used to control the operation of the wireless relay within a 0.5-meter range of the grounding tool.

[0066] Double confirmation: Determine whether the second sealing location is consistent with the first sealing location. If yes, determine the actual grounding sealing location corresponding to the grounding tool. If no, proceed to the software confirmation step.

[0067] Software-based grounding location: The indoor positioning strategy determines the first sealing point based on the detection signal generated when the grounding tool is grounded. Hardware-based grounding location: The detection results of the detection module and the operation of the wireless relays at close range are used. The substation's monitoring and control device receives remote signaling signals indicating the switching status of each wireless relay and determines the second sealing point based on the remote signaling signals when the wireless relays are closed. Since both hardware and hardware-based grounding location have inherent errors, to improve positioning accuracy, the grounding position of the grounding tool is determined jointly from both hardware and software perspectives. This effectively reduces the problem of incorrect determination of the actual grounding sealing point due to low indoor positioning accuracy and erroneous control by the remote signaling control unit, thus improving the reliability and accuracy of grounding detection and location.

[0068] One embodiment of this application is as follows: the communication module includes several WIFI base stations set up indoors at each sealing point. Based on the WIFI signal strength information collected by the grounding tool, the location of the grounding tool indoors can be located, which can effectively save positioning and communication costs.

[0069] One embodiment of this application is as follows: In software verification, a detection signal generated when the sealing point is grounded is received; in hardware verification, a remote signaling signal generated when the remote signaling control unit is closed is received; the reception time of the remote signaling signal and the detection signal are similar or the same.

[0070] One embodiment of this application is as follows: the central control unit communicates with the five-prevention host in real time based on the Mod-bus communication protocol; the central control unit is equipped with a remote signaling module for receiving remote signaling signals.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A grounding detection and location system for primary equipment in a substation, characterized in that, The system includes a grounding detection unit mounted on a grounding tool to detect its grounding status, and a remote signaling control unit located at the sealing point. The grounding detection unit communicates with both the remote signaling control unit and the central control unit. The remote signaling control unit includes a wireless relay for characterizing the sealing point's location information. Each grounding detection unit has a second communication module for controlling the operation of the wireless relay at its location. The central control unit incorporates a dual-confirmation detection strategy, including: Software confirmation: Receive the detection signal containing grounding information fed back by the grounding detection unit. The indoor positioning strategy uses the signal data generated by the received detection signal to locate and determine the first sealing point that matches the grounding tool. Hardware verification: The grounding detection unit controls the remote signaling control unit at the location of the grounding tool to operate based on the detected grounding information. The main control unit receives the corresponding remote signaling signal and determines the second sealing point that matches the grounding tool based on the remote signaling signal. Double confirmation: Determine whether the second sealing location is consistent with the first sealing location. If yes, determine the actual grounding sealing location corresponding to the grounding tool. If no, proceed to the software confirmation step.

2. The grounding detection and location system for primary equipment in a substation according to claim 1, characterized in that, The central control unit includes a first communication module that communicates with the grounding detection unit and is located indoors. The first communication module includes several Bluetooth base stations located in the equipment room where the sealing point is located.

3. The grounding detection and positioning system for primary equipment in a substation according to claim 2, characterized in that, The signal data includes the signal incident angle of the Bluetooth base station receiving the detection signal; The indoor positioning strategy includes: acquiring signal data generated when several Bluetooth base stations inside the device receive detection signals; using the Bluetooth arrival angle ranging method to determine the location of the grounding tool based on the signal data; and generating the current location containing the indoor Bluetooth base station number and indoor plane coordinates.

4. A grounding detection and location system for primary equipment in a substation according to claim 3, characterized in that, The central control unit is equipped with a positioning table that records the location information of each sealing point, which is used to match the current location of the grounding tool to determine the first sealing point.

5. A grounding detection and location system for primary equipment in a substation according to claim 1, characterized in that, The grounding detection unit includes a detection module for detecting the grounding resistance of the grounding tool and determining the grounding information in hardware form; the detection module includes a measurement point in contact with the sealing point, injecting current into the measurement point and collecting the ground voltage of the measurement point, calculating the ground resistance based on the injected current and the ground voltage, and determining the grounding status based on the ground resistance.

6. A grounding detection and location system for primary equipment in a substation according to claim 1, characterized in that, The remote signaling control unit includes a wireless relay for characterizing the location information of the sealing point. The substation's measurement and control device includes several input contacts for receiving input information and corresponding one-to-one with the sealing point. The measurement and control device receives the remote signaling signal composed of the input contacts and the corresponding received input information and sends it to the central control unit.

7. A grounding detection and location system for primary equipment in a substation according to claim 6, characterized in that, The grounding detection unit is equipped with a second communication module with adjustable transmission power, which is used to control the operation of the wireless relay at the location of the grounding detection unit and to communicate with the first communication module.

8. A grounding detection and location system for primary equipment in a substation according to claim 1, characterized in that, The central control unit contains a substation topology model with power equipment and sealing points as nodes and connection relationships as edges. An information table is constructed based on the node numbers of sealing points and power equipment. The information table includes the location number associated with the sealing point, voltage type, and grounding tool type. The detection signal contains the grounding tool type. The grounding tool corresponds to the actual grounding sealing point. The grounding tool type matches the information table to determine whether the grounding tool type is being used correctly.

9. A grounding detection and location system for primary equipment in a substation according to claim 8, characterized in that, The information table includes all incoming call node numbers associated with the sealing location.

10. A grounding detection and location system for primary equipment in a substation according to claim 1, characterized in that, The central control unit communicates with the five-proof host in real time via the Mod-bus communication protocol.

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