An intelligent electricity checking and grounding integrated device for overhauling a high-voltage switch cabinet of a thermal power plant

Abstract

The application discloses a kind of intelligent electricity detection grounding integrated device for high-voltage switch cabinet maintenance of thermal power plant, and relates to the technical field of electric power maintenance safety protection.The device includes an insulating shell and an electricity detection sensing module, a control module, an electric drive mechanism, a grounding clamping mechanism, an electromagnetic locking mechanism and a grounding connection assembly arranged thereon.An electric field sensing electrode is arranged on the static jaw.The control module only drives the locking pin to be unlocked and starts the electric drive mechanism when the induced voltage is lower than the set safety threshold.The dynamic jaw is driven by the screw nut pair and disc spring set to press the grounded busbar with constant clamping force, realizing the forced interlocking between electricity detection, locking and grounding actions.The clamping stroke is confirmed by the displacement sensor, and the grounding state is indicated on site and transmitted wirelessly.The application eliminates the misoperation of live installation of grounding wire from the structure, stabilizes the grounding contact resistance, and enables a single person to complete the installation, shortens the maintenance power-off time and is suitable for switch cabinet maintenance grounding operation in thermal power plants and substations.

Description

Technical Field

[0001] This invention relates to the field of power equipment maintenance technology, specifically to an intelligent integrated voltage detection and grounding device for the maintenance of high-voltage switchgear in thermal power plants, and a maintenance grounding method using this device. Background Technology

[0002] Thermal power plants widely use 6kV and 10kV high-voltage switchgear to supply power to auxiliary equipment such as coal mills, feedwater pumps, and forced and induced draft fans. According to the requirements of the "Electric Power Safety Work Regulations," before carrying out maintenance work on high-voltage switchgear and its busbars, three safety-ensuring technical measures must be completed in sequence: power outage, voltage testing, and grounding wire installation. Voltage testing is used to confirm that there is no voltage at the maintenance location, and grounding wire installation is used to discharge residual charge and prevent accidental power surges from endangering workers.

[0003] Currently, the common operating procedure at thermal power plants is as follows: operators use a handheld audible and visual high-voltage detector to check for voltage phase by phase. After confirming there is no voltage, they use a portable short-circuit grounding wire and manually clamp each phase onto the busbar using an insulated operating rod, then manually tighten it with a threaded clamping mechanism. The safety of this method relies entirely on operators strictly adhering to the operating sequence and operating permit system. The detector and the grounding wire are two independent tools, and there is no physical or electrical interlocking constraint between them.

[0004] The aforementioned existing technology has the following specific defects: First, the connection between voltage testing and grounding wire installation relies solely on management measures. If operators miss the voltage testing step, fail to notice the voltage tester's battery malfunction, or go to the wrong interval, there is a possibility of installing a grounding wire on a live busbar. This could lead to an arc short circuit, causing equipment damage and serious personal injury accidents. Second, the clamping force of the manual clamp depends on the operator's tightening force, which has a large dispersion. The contact resistance between the clamp jaws and the busbar is unstable, resulting in insufficient short-circuit current carrying capacity when the contact is poor. Furthermore, the threaded mechanism is prone to vibration and loosening after repeated use and wear. Third, there is a lack of electrical quantity feedback on the grounding status. Operators can only visually confirm the grounding wire installation status on-site and cannot conduct remote verification. The operation ticket circulation and on-site verification take a long time, extending the unit's maintenance and power outage time.

[0005] While existing technologies include electrically operated fixed grounding switches with electrically operated mechanisms, these switches are fixedly installed in specific locations within the switch cabinet, failing to cover the maintenance needs of temporary grounding points such as busbar joints and cable heads. Furthermore, their electric operating circuits lack mandatory interlocking with the voltage detection process, relying on an external microcomputer-based five-prevention system for error prevention. This system is vulnerable to failure when the five-prevention system fails or during unlocking operations. Existing portable electric grounding devices also fail to address the issues of maintaining constant clamping force and preventing malfunctions under power failure conditions.

[0006] Therefore, there is an urgent need for a portable maintenance grounding device that integrates voltage detection, anti-misoperation interlocking, electric grounding clamping, and status feedback into a single unit to form a forced interlock, so as to eliminate the accident risk of installing grounding wires while maintaining energized equipment structure and improve the efficiency of grounding operations. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides an intelligent integrated voltage detection and grounding device for the maintenance of high-voltage switchgear in thermal power plants and a maintenance grounding method using the device. The device integrates four functions: voltage detection, interlocking, grounding clamping, and status feedback into the same device, and achieves forced interlocking through both control logic and mechanical structure.

[0008] The technical solution adopted in this invention is: an intelligent integrated voltage detection and grounding device for the maintenance of high-voltage switchgear in thermal power plants, comprising an insulating shell, a voltage detection sensor module, a control module, an electric drive mechanism, a grounding clamping mechanism, an electromagnetic interlocking mechanism, and a grounding connection assembly. The grounding clamping mechanism includes a stationary clamp fixed to the top of the insulating shell and a movable clamp arranged vertically opposite to the stationary clamp. The electric drive mechanism is located inside the insulating shell, and its output end is connected to the movable clamp via a push rod, driving the movable clamp to close towards the stationary clamp, thus clamping the busbar to be grounded between them.

[0009] The voltage detection sensing module includes an electric field sensing electrode and a signal conditioning circuit board mounted on a stationary gripper. The electric field sensing electrode is positioned close to the busbar to be grounded, and its induced signal is filtered and shaped by the signal conditioning circuit board before being sent to the control module. The electromagnetic interlocking mechanism includes an electromagnet and a locking pin that is driven to extend and retract by the electromagnet. The locking pin is correspondingly positioned to the transmission component of the electric drive mechanism, and the transmission component cannot move in the locked state. The control module is configured to unlock the locking pin and activate the electric drive mechanism only when the induced voltage collected by the electric field sensing electrode is lower than a set safety threshold, thereby establishing a forced electromechanical interlock between the voltage detection result and the grounding action.

[0010] Furthermore, the electric drive mechanism includes a drive motor, a reducer, a lead screw, and a transmission nut seat. The lead screw is a trapezoidal lead screw with a lead angle smaller than the equivalent friction angle, and it forms a mechanical self-locking pair with the transmission nut seat. It will not loosen on its own after power failure.

[0011] Furthermore, a disc spring assembly is provided between the transmission nut seat and the push rod. After the moving jaws press the busbar, the disc spring assembly is compressed and maintains clamping with an approximately constant output force, eliminating the dispersion of clamping force caused by the difference in the motor's stopping position and the busbar's dimensional tolerance. The preload compression stroke of the disc spring assembly is 3-8 mm, and the steady-state clamping force is 800-1200 N.

[0012] Furthermore, a locking hole is provided on the side of the transmission nut seat, and the locking pin is inserted into the locking hole for engagement; the electromagnet is a power-off reset type, and when the device loses power, the locking pin automatically maintains the locked position under the action of the reset spring, forming a second layer of protection against misoperation in the event of power failure.

[0013] Furthermore, the device is also equipped with a displacement sensor, a status indication module, a wireless communication module, and a power supply module: the displacement sensor detects the axial travel of the transmission nut seat, allowing the control module to determine whether the clamping is in place; the status indication module displays the voltage detection, locking, and grounding status locally; the wireless communication module uploads the above status to a remote monitoring terminal; the static and moving grippers are reliably connected to the external grounding grid via grounding soft copper strips, grounding copper busbars, and grounding cable connectors.

[0014] The present invention also provides a grounding method for overhauling high-voltage switchgear in thermal power plants using the above-mentioned device, including steps such as device placement, non-contact voltage detection criterion determination, unlocking, electric clamping, stroke confirmation, secondary interlocking and status uploading, and work completion reset.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) Safety: The three links of voltage detection, interlocking, and grounding are forcibly connected in series by the control logic. When the voltage detection criterion is not passed, the electromagnetic interlocking pin mechanically locks the transmission mechanism. The grounding action cannot be completed before the voltage detection in a physical sense, thus eliminating the misoperation of installing the grounding wire while it is energized. The power failure reset interlocking and the screw self-locking pair constitute a double power failure safety design, which is in line with the policy orientation of the power industry to prevent misoperation and ensure safe production.

[0016] (2) In terms of reliability: the constant force clamping of the disc spring assembly ensures that the contact pressure of the jaws does not change with the operator and the specifications of the busbar. The silver-plated copper jaws, combined with a clamping force of 800~1200N, can stably control the contact resistance at the micro-ohm level (design value) to ensure the short-circuit current carrying capacity. The trapezoidal screw is self-locking and has a secondary locking mechanism, so it will not loosen under vibration conditions.

[0017] (3) Efficiency: Voltage testing and grounding are completed by the same device at one time, and a single person can operate it. According to the design process, the installation time of a single phase can be shortened from about 8 minutes by manual operation to about 2 minutes. After the grounding status is wirelessly uploaded, the operators can check it remotely, reducing the time for on-site confirmation, directly shortening the power outage period for unit maintenance, reducing power loss, and having the effect of energy saving and efficiency improvement.

[0018] (4) In terms of convertibility: the device uses all commercially available general components and conventional machining and molding processes. There are no special material and process barriers, the manufacturing cost is low, and it is easy to mass-produce and promote in scenarios such as thermal power plants, substations, and new energy booster stations. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments are briefly introduced below.

[0020] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the device of the present invention; Figure 3 This is a partially enlarged schematic diagram of the grounding clamping mechanism and the electromagnetic locking mechanism of the present invention; Figure 4 This is a block diagram of the control system of the present invention; Figure 5 This is a flowchart of the grounding maintenance method of the present invention.

[0021] Explanation of reference numerals in the attached drawings: 1. Insulating housing; 2. Voltage detection sensor module; 201. Electric field sensing electrode; 202. Signal conditioning circuit board; 3. Control module; 301. Main control circuit board; 302. Wireless communication module; 4. Electric drive mechanism; 401. Drive motor; 402. Reducer; 403. Lead screw; 404. Transmission nut seat; 5. Grounding clamping mechanism; 501. Static gripper; 502. Moving gripper; 503. Disc spring assembly; 504. Push rod; 6. Electromagnetic locking mechanism; 601. Electromagnet; 602. Locking pin; 7. Grounding connection assembly; 701. Grounding copper busbar; 702. Grounding cable connector; 8. Status indication module; 9. Power supply module; 10. Displacement sensor; 11. Busbar to be grounded. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments; the performance data mentioned herein are estimated values ​​obtained based on design parameters and are used to illustrate the implementation of the technical solution. 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.

[0023] Example 1. As... Figure 1 , Figure 2As shown, the intelligent voltage detection and grounding integrated device for the maintenance of high-voltage switchgear in thermal power plants in this embodiment includes an insulating shell (1). The insulating shell (1) is made of epoxy glass fiber molding, and its external dimensions are preferably 200mm×120mm×260mm, and the wall thickness is preferably 6-10mm, taking into account both insulation strength and overall weight, making it easy for a single person to carry and position it. A stationary clamp (501) is fixed on the top of the insulating shell (1). The stationary clamp (501) is inverted L-shaped, including a column and a horizontal arm. The lower surface of the horizontal arm forms the upper jaw. A movable clamp (502) is provided below the stationary clamp (501). The upper surface of the movable clamp (502) forms the lower jaw. The two jaws are opposite each other, and the busbar (11) to be grounded is located between them. The jaws of the stationary clamp (501) and the movable clamp (502) are both made of silver-plated copper. The jaw opening is adapted to the common busbar specifications with a width of 60-125mm and a thickness of 5-15mm.

[0024] like Figure 2 As shown, the insulating housing (1) contains, from bottom to top, a drive motor (401), a reducer (402), a lead screw (403), and a transmission nut seat (404), which together constitute an electric drive mechanism (4). The drive motor (401) is a DC geared motor, which is connected to the vertically arranged lead screw (403) via the reducer (402). The lead screw (403) is a trapezoidal lead screw with a lead angle smaller than the equivalent friction angle of the lead screw pair. It forms a mechanical self-locking pair with the transmission nut seat (404). Even if the device is completely de-energized, the established clamping state will not loosen on its own due to reverse load. The transmission nut seat (404) is connected to the push rod (504) above the disc spring assembly (503). The push rod (504) passes through the guide hole at the top of the insulating housing (1) and is fixed to the moving jaw (502).

[0025] like Figure 3 As shown, the disc spring assembly (503) is composed of multiple disc springs stacked together, with a pre-compression stroke of 3-8 mm. After the moving jaw (502) contacts the busbar to be grounded (11), the transmission nut seat (404) continues to move upward to compress the disc spring assembly (503). The output force of the disc spring is approximately constant, and the steady-state clamping force is designed to be 800-1200 N. Therefore, the clamping force no longer depends on the motor stop position and the busbar size tolerance. The contact resistance between the jaws and the busbar can be stably controlled in the micro-ohm range (design value), meeting the short-circuit current carrying requirements.

[0026] A lock hole is provided on the side of the transmission nut seat (404). An electromagnet (601) is fixed inside the insulating housing (1). The end of the moving iron core of the electromagnet (601) is connected to a locking pin (602). The locking pin (602) is inserted into the lock hole, and the two constitute an electromagnetic locking mechanism (6). The electromagnet (601) is a power-off reset type: when the coil is de-energized, the reset spring presses the locking pin (602) into the lock hole, and the transmission nut seat (404) is mechanically locked, and the electric drive mechanism (4) cannot operate; the locking pin (602) will only exit the lock hole when the control module (3) issues an unlocking command and the coil is energized.

[0027] like Figure 1 , Figure 3 As shown, an electric field sensing electrode (201) is provided on the front side of the horizontal arm of the stationary gripper (501). The electric field sensing electrode (201) is a metal sensing sheet, which is arranged close to the jaws and maintains a fixed spatial coupling relationship with the busbar to be grounded (11); Figure 2 As shown, a signal conditioning circuit board (202) is provided in the upper part of the insulating housing (1). The electric field sensing electrode (201) and the signal conditioning circuit board (202) constitute the voltage detection sensing module (2). When the busbar is energized, an induced voltage proportional to the busbar voltage is generated on the electric field sensing electrode (201). The signal conditioning circuit board (202) limits, filters and shapes the signal before sending it to the control module (3).

[0028] like Figure 2 , Figure 4 As shown, the control module (3) includes a main control circuit board (301) and a wireless communication module (302) mounted on the inner rear wall of the insulating housing (1). The signal input terminal of the main control circuit board (301) is connected to the signal conditioning circuit board (202) and the displacement sensor (10), and the control output terminal is connected to the drive motor (401), the electromagnet (601), and the status indicator module (8). The wireless communication module (302) adopts LoRa or 4G standard to upload the device status to the remote monitoring terminal. The displacement sensor (10) is a linear displacement sensor, which is arranged on the inner wall of the insulating housing (1) along the travel direction of the transmission nut seat (404) and outputs the axial position of the transmission nut seat (404) in real time. The status indicator module (8) is located on the front surface of the insulating housing (1) and displays the three states of voltage detection, lockout, and grounding with three-color indicator lights. The power supply module (9) is a rechargeable lithium battery pack that powers the whole machine.

[0029] like Figure 1 , Figure 2 As shown, the grounding connection assembly (7) includes a grounding copper busbar (701) located at the bottom of the insulating housing (1) and a grounding cable connector (702) passing through the side wall of the insulating housing (1). The stationary clamp (501) and the moving clamp (502) each have a cross-section of not less than 25mm². 2The grounding soft copper strip is connected to the grounding copper busbar (701), the grounding copper busbar (701) is electrically connected to the grounding cable connector (702), and the grounding cable connector (702) is connected to the switch cabinet grounding busbar or grounding grid through a dedicated grounding cable to form a complete grounding discharge path.

[0030] The core control logic of the device in this embodiment is as follows: the main control circuit board (301) continuously collects induced voltage using the power frequency cycle as the sampling window, and sets a safety threshold of 25% to 40% of the induced voltage value corresponding to the rated phase voltage of the circuit to be inspected; only when the induced voltage in 5 or more consecutive sampling windows is lower than the threshold is it determined that the busbar is not energized and unlocking is allowed; if any sampling window exceeds the threshold, it is determined that it is energized, the main control circuit board (301) drives the status indicator module (8) to issue an audible and visual alarm, and keeps the electromagnetic locking mechanism (6) locked. The voltage detection criterion, the locking status and the drive enable are forcibly connected in the program, and the mechanical locking of the locking pin (602) to the transmission nut seat (404) is independent of the program, forming a double electrical and mechanical anti-misoperation barrier.

[0031] Example 2. As a further improvement of Example 1, the jaws of the stationary jaw (501) and the moving jaw (502) are designed to be replaceable and fixed by dovetail grooves and positioning screws. Corresponding jaw components are configured for busbars, round conductors or cable heads of different widths, expanding the applicability of the device. At the same time, a temperature sensor can be embedded in the jaw to monitor the temperature rise of the contact point in real time during grounding and upload it through the wireless communication module (302), providing overheat warning for long-term grounding conditions.

[0032] Example 3. As another variation of Example 1, the trapezoidal lead screw pair in the electric drive mechanism (4) can be replaced with a planetary roller lead screw pair and equipped with a worm gear self-locking stage, which is suitable for occasions with higher clamping force requirements (above 1500N); the locking pin (602) of the electromagnetic locking mechanism (6) can also be changed to cooperate with the ratchet at the end of the lead screw (403) to achieve unidirectional locking of the lead screw rotation direction. The above substitutions do not change the forced interlocking relationship of voltage detection-locking-clamping, and all belong to the equivalent implementation of the technical concept of the present invention.

[0033] The maintenance grounding method of the above-mentioned device is as follows: Figure 5As shown, the process includes the following steps: S1, the operator positions the device so that the static gripper (501) hangs above the busbar to be grounded (11); S2, the electric field sensing electrode (201) performs non-contact voltage testing and sampling, and the control module (3) judges whether the busbar voltage is lower than the set safety threshold according to the above criteria. If not, an audible and visual alarm is triggered and the device remains locked, returning to S2; if yes, proceed to S3; S3, the main control circuit board (301) drives the electromagnet (601) to drive the locking pin (602) to exit and unlock; S4, the drive motor (401) passes through the reducer (402) Drive screw (403) rotates, transmission nut seat (404) rises together with push rod (504); S5, moving gripper (502) presses busbar with constant force through disc spring assembly (503), displacement sensor (10) stops drive motor (401) after confirming that the stroke has entered the set range; S6, locking pin (602) is inserted into lock hole again to lock, status indicator module (8) lights grounding indicator, wireless communication module (302) uploads grounding status; S7, after maintenance is completed, unlock and exit in reverse order, device status returns to normal. The whole process is automatically completed by the device in sequence control, and operators cannot skip the voltage testing link to directly perform grounding action.

[0034] Regarding the adaptability of this invention: the DC geared motor, trapezoidal lead screw, disc spring, electromagnet, lithium battery, LoRa / 4G module, etc. used in the device are all commercially available standard parts; the insulating shell is a one-time molding part, and the grippers are conventional copper parts machined and silver-plated, with no special process barriers. It is estimated that the material and processing cost per unit is about 3,000 to 5,000 yuan, which meets the conditions for small-batch trial production and rapid product formation; in addition to high-voltage switchgear in thermal power plants, the device can also be directly used in maintenance scenarios such as substation switchgear and new energy booster station busbars, with a wide market applicability.

[0035] Regarding the economic benefits of this invention (the following are estimated values): Taking a 600MW thermal power unit as an example, the plant power system undergoes approximately 200 grounding operations per year during A / B level maintenance and routine troubleshooting. After adopting this device, the process of checking for voltage and installing grounding wires is reduced by 6 minutes each time, and each operation requires two workers, resulting in an annual saving of approximately 40 man-hours. More importantly, the ability to remotely verify the grounding status shortens the power outage and restoration operation ticket processing time by an average of approximately 15 minutes per operation. Based on 200 operations per year, this equates to a reduction of approximately 50 hours of maintenance outage window per year, which, when converted to unit capacity, can significantly reduce power generation losses. At the same time, the device structurally eliminates the conditions for serious accidents caused by installing grounding wires while the unit is energized. The direct equipment losses and personal injury compensation for a single such accident are typically in the millions of yuan, demonstrating significant preventative value.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An intelligent integrated voltage detection and grounding device for the maintenance of high-voltage switchgear in thermal power plants, characterized in that: The system includes an insulating housing (1), a voltage detection sensor module (2), a control module (3), an electric drive mechanism (4), a grounding clamping mechanism (5), an electromagnetic locking mechanism (6), and a grounding connection assembly (7). The grounding clamping mechanism (5) includes a stationary clamp (501) fixed to the top of the insulating housing (1) and a movable clamp (502) arranged vertically opposite to the stationary clamp (501). The electric drive mechanism (4) is located inside the insulating housing (1), and its output end is connected to the movable clamp (502) via a push rod (504) to drive the movable clamp (502) to close towards the stationary clamp (501) to clamp the busbar (11) to be grounded between them. The voltage detection sensor module (2) includes an electric field sensing electrode (201) and a signal conditioning circuit board (202) disposed on the stationary clamp (501). The electric field sensing electrode (201) is connected to the signal input terminal of the control module (3) via the signal conditioning circuit board (202); the electromagnetic locking mechanism (6) includes an electromagnet (601) and a locking pin (602) driven to extend and retract by the electromagnet (601). The locking pin (602) is correspondingly arranged with the transmission component of the electric drive mechanism (4) and is used to lock or release the transmission component; the control module (3) is controlled and connected to the electric drive mechanism (4) and the electromagnet (601) respectively, and is configured to control the locking pin (602) to unlock and start the electric drive mechanism (4) only when the induced voltage collected by the electric field sensing electrode (201) is lower than the set safety threshold; the stationary gripper (501) and the moving gripper (502) are both electrically connected to the external grounding grid through the grounding connection component (7).

2. The intelligent voltage detection and grounding integrated device for the maintenance of high-voltage switchgear in thermal power plants according to claim 1, characterized in that: The electric drive mechanism (4) includes a drive motor (401), a reducer (402), a lead screw (403), and a transmission nut seat (404); the drive motor (401) is connected to the vertically arranged lead screw (403) via the reducer (402), the transmission nut seat (404) is threaded with the lead screw (403) and moves back and forth along its axial direction, and the lower end of the push rod (504) is connected to the transmission nut seat (404); the lead screw (403) is a trapezoidal lead screw with a lead angle smaller than its equivalent friction angle, and forms a mechanical self-locking pair with the transmission nut seat (404).

3. The intelligent voltage detection and grounding integrated device for the maintenance of high-voltage switchgear in thermal power plants according to claim 2, characterized in that: A disc spring assembly (503) is provided between the transmission nut seat (404) and the push rod (504). The disc spring assembly (503) is compressed after the moving jaw (502) presses against the grounding busbar (11), providing a constant clamping force to the clamping point. The pre-tightening compression stroke of the disc spring assembly (503) is 3-8 mm, and the steady-state clamping force is 800-1200 N.

4. The intelligent voltage detection and grounding integrated device for the maintenance of high-voltage switchgear in thermal power plants according to claim 2, characterized in that: The transmission nut seat (404) has a locking hole on its side, and the locking pin (602) is inserted into the locking hole; the electromagnet (601) is a power-off reset type, and in the power-off state, the locking pin (602) is kept in the locked position inserted into the locking hole under the action of the reset spring.

5. The intelligent voltage detection and grounding integrated device for the maintenance of high-voltage switchgear in thermal power plants according to claim 2, characterized in that: It also includes a displacement sensor (10), which is located inside the insulating housing (1) and connected to the control module (3) for detecting the axial travel of the transmission nut seat (404); the control module (3) is configured to determine that the clamping is in place when the axial travel reaches the set range corresponding to the specification of the busbar to be grounded (11), and to stop the drive motor (401).

6. The intelligent voltage detection and grounding integrated device for the maintenance of high-voltage switchgear in thermal power plants according to claim 1, characterized in that: The control module (3) includes a main control circuit board (301) and a wireless communication module (302); the device also includes a status indication module (8) disposed on the outer surface of the insulating housing (1); the main control circuit board (301) displays the voltage detection, interlocking and grounding status locally through the status indication module (8), and uploads the status to a remote monitoring terminal through the wireless communication module (302).

7. The intelligent voltage detection and grounding integrated device for the maintenance of high-voltage switchgear in thermal power plants according to claim 1, characterized in that: It also includes a power module (9) disposed inside the insulating housing (1); the grounding connection assembly (7) includes a grounding copper busbar (701) disposed at the bottom of the insulating housing (1) and a grounding cable connector (702) passing through the side wall of the insulating housing (1), the stationary clamp (501) and the moving clamp (502) are respectively connected to the grounding copper busbar (701) via grounding soft copper strip, and the grounding copper busbar (701) is electrically connected to the grounding cable connector (702).

8. The intelligent voltage detection and grounding integrated device for the maintenance of high-voltage switchgear in thermal power plants according to claim 1, characterized in that: The insulating shell (1) is an epoxy glass fiber molded part or an engineering plastic injection molded part with a wall thickness of 6-10mm; the jaws of the stationary jaw (501) and the moving jaw (502) are silver-plated copper parts, and the jaw opening is adapted to a busbar with a width of 60-125mm; the set safety threshold is taken as 25%-40% of the induced voltage value corresponding to the rated phase voltage of the circuit to be inspected.

9. A grounding method for maintenance of high-voltage switchgear in thermal power plants, employing the intelligent integrated voltage detection and grounding device for maintenance of high-voltage switchgear in thermal power plants as described in any one of claims 1 to 8, characterized in that... Includes the following steps: S1. Position the device so that the static gripper (501) hangs above the busbar to be grounded (11); S2. The electric field sensing electrode (201) performs non-contact voltage testing on the busbar to be grounded (11). The control module (3) determines whether the induced voltage is lower than the set safety threshold. If not, it issues an audible and visual alarm and keeps the electromagnetic locking mechanism (6) locked, returning to S2; if yes, it proceeds to S3; S3. The control module (3) controls the electromagnet (601) to drive the locking pin (602) out, releasing the lock on the electric drive mechanism (4); S4. The drive motor (401) drives the lead screw (402) via the reducer (402) 403) Rotate, driving the transmission nut seat (404) and push rod (504) to rise; S5, the moving gripper (502) presses the grounding busbar (11) with constant clamping force through the disc spring group (503), and the displacement sensor (10) stops the drive motor (401) after confirming that the stroke is in place; S6, the locking pin (602) is inserted into the lock hole again to lock, the status indicator module (8) lights up the grounding indicator, and the wireless communication module (302) uploads the grounding status to the remote monitoring terminal; S7, after the maintenance is completed, the control module (3) unlocks in the reverse order and drives the moving gripper (502) to exit, and the device status returns to normal.

10. The grounding method for overhauling high-voltage switchgear in thermal power plants according to claim 9, characterized in that: In step S2, the control module (3) continuously samples the induced voltage using the power frequency cycle as the sampling window. Only when the induced voltage in 5 or more consecutive sampling windows is lower than the set safety threshold is it determined that the busbar to be grounded (11) is not energized; if the induced voltage in any sampling window exceeds the set safety threshold, it is determined to be energized and kept locked.

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