Intelligent small-current grounding fault detection line selection control device for power system

Abstract

The invention relates to the technical field of fault detection devices, in particular to an intelligent low-current grounding fault detection line selection control device for a power system, which comprises a box body, a drawer type assembly bin is slidably mounted at the upper end in the box body, and an electric management and fault execution mechanism is fixedly mounted in the drawer type assembly bin. And a middle-layer assembly bin is fixedly mounted at the upper ends of the sliding guide rails, a core control mechanism is slidably mounted in the middle-layer assembly bin, a bottom bearing platform is fixedly mounted at the bottom end in the box body, and an execution driving mechanism is fixedly mounted at the upper end of the bottom bearing platform. Compared with a traditional integrated fault detection device, different mechanisms such as corresponding assembly bin maintenance power management, core control and execution driving can be drawn in a targeted mode, and the whole device does not need to be disassembled. The device can effectively release static electricity and fault current in equipment operation, avoids potential safety hazards such as electric leakage and short circuit, and improves the stability and safety of equipment operation under complex working conditions of a power system.

Description

Technical Field

[0001] This invention relates to the field of fault detection device technology, and in particular to an intelligent low-current grounding fault detection and line selection control device for power systems. Background Technology

[0002] The low-current grounding fault detection and line selection control device is a core operation and maintenance equipment for power systems in industrial plants. It is widely used in the power distribution networks of various factories such as metallurgy, manufacturing, and chemical industries. It plays an important role in monitoring the operating status of low-voltage power distribution lines in the plant area, accurately detecting low-current grounding faults, quickly selecting faulty lines, and controlling and cutting off circuits. It is a key device to ensure continuous power supply for factory production, reduce losses from power outages, and avoid production safety accidents caused by power distribution faults. It directly affects the stability of the power system in the plant area and the safety of production operations.

[0003] Factory power distribution environments are characterized by large power loads, complex distribution branches, numerous electromechanical equipment and strong electromagnetic interference, and limited maintenance space in production areas. This places stringent demands on the detection accuracy, response efficiency, ease of operation and maintenance, and protective performance of fault detection and fault location devices. However, existing devices still have many technical shortcomings in practical factory applications. Without specialized intelligent sensors, they are difficult to adapt to the special power distribution conditions of factories and cannot meet the core needs of intelligent power system development.

[0004] Meanwhile, traditional grounding protection designs are simplistic, relying solely on a single terminal or grounding pin to form a basic grounding loop. This makes it difficult to effectively release fault currents and static electricity. Furthermore, some devices lack fuses, circuit breakers, or other connections to the protection components, resulting in insufficient protection against sudden events such as short circuits and leakage. In addition, existing devices have a low level of automation, relying heavily on manual troubleshooting or simple testing modules. They lack intelligent sensors and professional signal acquisition, processing, and intelligent fault selection structures to work in synergy. Consequently, fault detection accuracy is low, fault selection is slow, and it is difficult to adapt to the intelligent and automated operation requirements of power systems.

[0005] The existing technology has the following shortcomings: 1. Existing fault detection devices are mostly integrated structures with no independent modular compartments for internal components and no sliding disassembly structure. During maintenance, the entire device must be disassembled, making it impossible to perform targeted maintenance on electrical management, control, drive, and other mechanisms separately. At the same time, the wiring is messy and lacks a dedicated wiring structure, which easily leads to wire tangling problems, greatly increasing the difficulty and time required for maintenance and making the equipment maintenance inconvenient.

[0006] 2. Traditional grounding protection relies solely on a single grounding terminal or grounding foot, failing to form a multi-level, comprehensive grounding loop. This makes it ineffective in releasing static electricity and fault current generated during the operation of various equipment mechanisms. Furthermore, some devices lack fuses, circuit breakers, or other connections to the protection components. In the face of sudden situations such as short circuits or leakage, it is difficult to promptly disconnect the fault circuit, resulting in significant shortcomings in the operational stability and safety of the equipment under complex electrical conditions.

[0007] 3. Existing technologies largely rely on manual inspection or simple detection modules, lacking intelligent sensors and a professional collaborative working structure consisting of intelligent sensors, sample-and-hold modules, detection boards, and line selection boards. This makes it impossible to achieve real-time, accurate signal acquisition and location of low-current grounding faults. After fault detection, manual line selection and operation are required, which not only results in low detection accuracy but also significantly prolongs fault inspection and handling time, making it difficult to adapt to the intelligent operation requirements of power systems. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and to propose an intelligent low-current grounding fault detection and line selection control device for power systems.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an intelligent low-current grounding fault detection and line selection control device for power systems, comprising a housing, an operation panel fixedly installed on the upper end of the housing, a display unit fixedly installed on the upper end of the operation panel, side guard plates fixedly installed at all four corners of the operation panel, an external interface provided on the front surface of the housing, casters rotatably installed on the lower end of the housing, a drawer-type component compartment slidably installed on the upper end of the housing, an electrical management and fault execution mechanism fixedly installed inside the drawer-type component compartment, a sliding guide rail slidably installed on the lower end of the drawer-type component compartment inside the housing, a middle-layer component compartment fixedly installed on the upper end of the sliding guide rail, a core control mechanism slidably installed inside the middle-layer component compartment, a bottom support platform fixedly installed on the bottom support platform, an execution drive mechanism fixedly installed on the upper end of the bottom support platform, and a wiring box fixedly installed on the rear surface of the inner wall of the housing, the wiring box being fixedly installed at the rear ends of the drawer-type component compartment, the middle-layer component compartment, and the bottom support platform respectively.

[0010] As a preferred technical solution of the present invention, a side cable end is fixedly installed on one side of the upper end of the wiring box, the wiring box and the side cable end are fixedly installed at the rear end of the middle component compartment, and the lower end of the side cable end is fixedly installed to the upper end of the bottom support platform.

[0011] As a preferred technical solution of the present invention, the electrical management and fault execution mechanism further includes an ammeter indicator fixedly installed at one end of the upper surface of the drawer-type component compartment. A fuse is fixedly installed on the upper surface of the drawer-type component compartment at the rear end of the ammeter indicator. A fixing plate is fixedly installed on one side of the upper surface of the inner wall of the drawer-type component compartment. A circuit breaker is fixedly installed on one side of the fixing plate. A manual control lever is movably installed on the upper end of the circuit breaker. The manual control lever penetrates the outer surface of the housing.

[0012] As a preferred technical solution of the present invention, an inlet terminal is provided on the right rear end of the drawer-type component compartment, an outlet terminal is provided on the left rear end of the drawer-type component compartment, and a current transformer is fixedly installed on the upper surface of the drawer-type component compartment between the fuse and the circuit breaker.

[0013] As a preferred technical solution of the present invention, the core control mechanism further includes sliding grooves formed on both sides of the inner wall of the box, the sliding guide rail is slidably installed on the upper end of the sliding groove, a detection plate is slidably installed on the upper end of the inner wall of the middle layer component compartment, an electronic control board is slidably installed on the inner wall of the middle layer component compartment below the detection plate, a cable selection board is slidably installed on the inner wall of the middle layer component compartment below the electronic control board, and the cable box is respectively connected to the rear end of the detection plate, the electronic control board and the cable selection board.

[0014] As a preferred technical solution of the present invention, the execution drive mechanism further includes a horizontally placed grounding terminal fixedly installed on one side surface of the bottom support platform. A grounding support foot is fixedly installed at the lower end of the horizontally placed grounding terminal. A relay is fixedly installed on the upper surface of the bottom support platform. An outgoing switch is fixedly installed on the upper surface of the bottom support platform on the side of the relay. A signal collector is fixedly installed on the side of the relay. An auxiliary circuit mechanism is fixedly installed at the upper end of the signal collector. A contactor and a terminal block are fixedly installed on the upper surface of the bottom support platform on the side of the relay.

[0015] As a preferred technical solution of the present invention, the auxiliary circuit mechanism further includes a signal acquisition interface fixedly installed on the upper end of the signal collector. The inner wall of the signal acquisition interface is symmetrically provided with fixing lugs. The outer surface of the signal acquisition interface is provided with a sampling and holding module symmetrical to the fixing lugs. A switch piece is fixedly installed on the upper end of the relay. A connecting plate is rotatably installed on the upper end of the outgoing switch. A telescopic pole is rotatably installed between the connecting plate and the signal collector.

[0016] As a preferred technical solution of the present invention, the rear ends of the drawer-type component compartment, the middle component compartment, and the bottom support platform are all fixedly installed with horizontal grounding terminals, the inner wall of the box is fixedly installed with vertical grounding terminals, and the three horizontal grounding terminals are fixedly installed on the front surface of the vertical grounding terminals.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The device adopts a three-layer modular structure consisting of a drawer-type component compartment, a middle-layer component compartment, and a bottom support platform. Each component compartment features a sliding installation design, and components such as the detection board and electronic control board of the core control mechanism can also be independently slidably disassembled. Meanwhile, the inner wall of the enclosure is equipped with dedicated cable trays and side cable terminals to ensure neat arrangement of wiring for each mechanism and prevent cable tangling. Compared to traditional integrated fault detection devices, personnel can selectively pull out corresponding component compartments to inspect different mechanisms such as electrical management, core control, and actuators without disassembling the entire device, significantly reducing maintenance difficulty and improving the efficiency of equipment maintenance and component replacement.

[0018] 2. The device employs a multi-layered grounding protection structure. Horizontal grounding terminals are located at the rear of the drawer-type component compartment, the middle component compartment, and the bottom support platform. All horizontal grounding terminals are connected to vertical grounding terminals on the inner wall of the enclosure, forming a comprehensive grounding loop in conjunction with the bottom grounding support feet. Intelligent sensors monitor the connection status and current release of the grounding loop in real time, providing early warning of grounding faults. Simultaneously, the electrical management and fault execution mechanism is equipped with protective components such as fuses and circuit breakers. Intelligent sensors synchronously collect the operating status signals of these protective components and feed them back to the core control mechanism, enabling real-time current monitoring and rapid disconnection of faulty loops. Compared to existing single-detection grounding protection devices, this device effectively releases static electricity and fault current during equipment operation, preventing safety hazards such as leakage and short circuits, and improving the stability and safety of the equipment under complex power system conditions.

[0019] 3. The device integrates current transformers, ammeter indicators, and other detection components with a core control mechanism consisting of a detection board, a line selection board, and an electronic control board. Combined with auxiliary circuit components such as a signal collector and a sample-and-hold module, it enables real-time signal acquisition, accurate detection, and intelligent line selection for small-current grounding faults. After receiving the fault signal, the signal collector transmits it stably to the core control mechanism via the sample-and-hold module, quickly locating the faulty line and completing subsequent processing through the execution drive mechanism. Simultaneously, the fault data is displayed intuitively on the display unit. Compared to traditional manual troubleshooting or devices with low detection accuracy, this device, through the coordinated linkage of intelligent sensors and various detection and control components, achieves automation and intelligence in fault detection, line selection, and execution, significantly shortening fault investigation and processing time and improving the efficiency and accuracy of power system fault handling. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an intelligent low-current grounding fault detection and line selection control device for power systems according to the present invention; Figure 2 This is a schematic diagram of another perspective of the intelligent low-current grounding fault detection and line selection control device for power systems according to the present invention. Figure 3 This is a cross-sectional view of an intelligent low-current grounding fault detection and line selection control device for power systems according to the present invention. Figure 4 This is a schematic diagram of the wiring box structure of an intelligent low-current grounding fault detection and line selection control device for power systems according to the present invention; Figure 5 This is a schematic diagram of the electrical management and fault execution mechanism of an intelligent low-current grounding fault detection and line selection control device for power systems according to the present invention. Figure 6 This is a schematic diagram of the core control mechanism of an intelligent low-current grounding fault detection and line selection control device for power systems according to the present invention. Figure 7 This is a schematic diagram of the core control mechanism of the intelligent low-current grounding fault detection and line selection control device for power systems according to the present invention from another perspective. Figure 8 This is a schematic diagram of the bottom support platform structure of an intelligent low-current grounding fault detection and line selection control device for power systems according to the present invention; Figure 9 This invention relates to an intelligent low-current grounding fault detection and line selection control device for power systems. Figure 8 Enlarged view of section B in the middle.

[0021] The attached diagram lists the components represented by each number as follows: 1. Cabinet; 2. Control Panel; 3. Display Unit; 4. Side Panel; 5. Grounding Support Leg; 6. Casters; 7. Drawer-type Component Compartment; 8. Middle-layer Component Compartment; 9. Bottom Support Platform; 10. Horizontal Grounding Terminal; 11. Vertical Grounding Terminal; 12. Cable Management Box; 13. Sliding Rail; 14. Detection Board; 15. Electronic Control Board; 16. Cable Selection Board; 17. External Interface; 18. Slide Rail; 19. 20. Relay; 21. Contactor; 22. Terminal block; 23. Outgoing switch; 24. Connector to bend plate; 25. Telescopic pole; 26. Signal collector; 27. Signal acquisition interface; 28. Fixing lug; 29. ​​Switch plate; 30. Sample hold module; 31. Side line terminal; 32. Incoming line terminal; 33. Outgoing line terminal; 34. Fuse; 35. Ammeter indicator; 36. Current transformer; 37. Fixing plate; 38. Circuit breaker; 39. Manual control lever. Detailed Implementation

[0022] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0023] like Figures 1-9The illustrated intelligent low-current grounding fault detection and line selection control device for a power system includes a housing 1. An operation panel 2 is fixedly mounted on the upper part of the housing 1, and a display unit 3 is fixedly mounted on the upper part of the operation panel 2. Side guard plates 4 are fixedly mounted on all four corners of the operation panel 2. An external interface 17 is provided on the front surface of the housing 1 to provide external communication and line connection support for intelligent power system networking. Casters 6 are rotatably mounted on the lower part of the housing 1. A drawer-type component compartment 7 is slidably mounted on the upper part of the interior of the housing 1. An electrical management and fault execution mechanism is fixedly mounted inside the drawer-type component compartment 7. A sliding guide rail 13 is slidably mounted on the lower part of the drawer-type component compartment 7 inside the housing 1. A middle-layer component compartment 8 is fixedly installed on the upper end of the sliding guide rail 13. The core control mechanism is slidably installed inside the middle-layer component compartment 8, which is the core carrier for realizing intelligent fault detection and line selection of the power system. A bottom support platform 9 is fixedly installed at the bottom of the box 1. An execution drive mechanism is fixedly installed on the upper end of the bottom support platform 9, which receives the core control command and completes the intelligent fault handling execution action of the power system. A cable box 12 is fixedly installed on the rear surface of the inner wall of the box 1. The cable box 12 is fixedly installed at the rear end of the drawer-type component compartment 7, the middle-layer component compartment 8, and the bottom support platform 9, respectively, to ensure the regularity of the line and signal transmission between various mechanisms during the intelligent operation of the power system.

[0024] A side cable end 30 is fixedly installed on one side of the upper end of the cable box 12. The cable box 12 and the side cable end 30 are fixedly installed at the rear end of the middle component compartment 8. The lower end of the side cable end 30 is fixedly installed to the upper end of the bottom support platform 9.

[0025] The electrical management and fault execution mechanism also includes an ammeter indicator 34 fixedly installed at one end of the upper surface of the drawer-type component compartment 7. A fuse 33 is fixedly installed on the upper surface of the drawer-type component compartment 7 at the rear end of the ammeter indicator 34. A fixing plate 36 is fixedly installed on one side of the upper surface of the inner wall of the drawer-type component compartment 7. A circuit breaker 37 is fixedly installed on one side of the fixing plate 36. A manual control lever 38 is movably installed on the upper end of the circuit breaker 37. The manual control lever 38 penetrates the outer surface of the enclosure 1.

[0026] The drawer-type component compartment 7 has an inlet terminal 31 on the right rear end and an outlet terminal 32 on the left rear end. A current transformer 35 is fixedly installed on the upper surface of the drawer-type component compartment 7 between the fuse 33 and the circuit breaker 37.

[0027] The core control mechanism also includes slide grooves 18 on both sides of the inner wall of the enclosure 1, sliding guide rails 13 are slidably installed on the upper end of slide grooves 18, detection plate 14 is slidably installed on the upper end of the inner wall of the middle component compartment 8, electronic control plate 15 is slidably installed on the inner wall of the middle component compartment 8 below detection plate 14, and cable selection plate 16 is slidably installed on the inner wall of the middle component compartment 8 below electronic control plate 15. The cable box 12 is connected to the rear end of detection plate 14, electronic control plate 15 and cable selection plate 16 respectively.

[0028] The actuator also includes a horizontal grounding terminal 10 fixedly installed on one side of the bottom support platform 9. A grounding support foot 5 is fixedly installed at the lower end of the horizontal grounding terminal 10. A relay 19 is fixedly installed on the upper surface of the bottom support platform 9. A line switch 22 is fixedly installed on the upper surface of the bottom support platform 9 on one side of the relay 19. A signal collector 25 is fixedly installed on one side of the relay 19. An auxiliary circuit mechanism is fixedly installed on the upper end of the signal collector 25. A contactor 20 and a terminal block 21 are fixedly installed on the upper surface of the bottom support platform 9 on one side of the relay 19. The intelligent sensor can monitor the connection status and current release of the horizontal grounding terminal 10 and the vertical grounding terminal 11 in real time. If an abnormality occurs in the grounding circuit, it can provide timely feedback and warning.

[0029] The auxiliary circuit mechanism also includes a signal acquisition interface 26 fixedly installed on the upper end of the signal collector 25. The inner wall of the signal acquisition interface 26 is symmetrically provided with fixing lugs 27. The outer surface of the signal acquisition interface 26 is provided with a sampling and holding module 29 symmetrical to the fixing lugs 27. A switch piece 28 is fixedly installed on the upper end of the relay 19. A connecting plate 23 is rotatably installed on the upper end of the outgoing switch 22. A telescopic pole 24 is rotatably installed between the connecting plate 23 and the signal collector 25. The sampling and holding module 29 can latch and stabilize the transient fault signal transmitted by the intelligent sensor to avoid signal distortion from affecting the fault judgment result.

[0030] The rear ends of the drawer-type component compartment 7, the middle component compartment 8, and the bottom support platform 9 are all fixedly installed with horizontal grounding terminals 10. The inner wall of the box 1 is fixedly installed with vertical grounding terminals 11. The three horizontal grounding terminals 10 are fixedly installed on the front surface of the vertical grounding terminals 11.

[0031] Working principle: The current of the power system distribution line is connected to the device through the inlet terminal 31 at the rear end of the drawer-type component compartment 7. The current transformer 35 and the intelligent sensor form a dual-channel acquisition structure to collect the line current signal in real time. The abnormal current signal generated by the small current grounding fault is converted into a detectable electrical signal. The ammeter indicator 34 displays the line current status simultaneously, and the staff can view it intuitively through the display unit 3. The fuse 33 provides overcurrent protection for the line throughout the process. If a sudden large current fault occurs, it can be directly blown to achieve preliminary fault protection. The blowing status of the fuse 33 can also be quickly captured and fed back by the intelligent sensor.

[0032] The dual abnormal signals collected by the intelligent sensor and the current transformer 35 are transmitted through the wiring box 12 to the detection board 14 in the middle component compartment 8. The detection board 14 performs preliminary screening and amplification of the fault signals, and then transmits them to the electronic control board 15 for precise analysis to determine whether a small current grounding fault has occurred in the line and extract the core fault parameters. During this process, the signal collector 25 on the bottom support platform 9 synchronously receives the fault feedback signal from the power distribution line side through the signal acquisition interface 26. The sample and hold module 29 latches and stably transmits the transient fault signal to avoid signal distortion and provide dual signal support for fault detection.

[0033] After the electronic control board 15 completes the fault determination, it transmits the fault signal to the line selection board 16. The line selection board 16 performs intelligent analysis and line selection on multiple branches of the power distribution network according to the preset program and fault parameters, and accurately locates the line where the small current grounding fault is located. Then, the line selection board 16 transmits the fault line selection result and handling instructions to the execution drive mechanism of the bottom support platform 9 through the wiring box 12, and at the same time feeds back the fault line, fault parameters and other information to the display unit 3 to realize the visualization of fault information.

[0034] After receiving the instruction, the drive mechanism activates the relay 19 and triggers the contactor 20 via the switch piece 28. The contactor 20, in conjunction with the wiring connection of the terminal block 21, issues a disconnection command to the faulty circuit. The signal collector 25 synchronously drives the telescopic pole 24 to extend and retract, causing the connected bending plate 23 to rotate and triggering the outgoing switch 22 to activate. This, together with the circuit breaker 37 in the drawer-type component compartment 7, forms a dual-circuit control. The operating status of the circuit breaker 37 is monitored in real time by intelligent sensors and fed back to the core control mechanism to ensure that the faulty circuit is disconnected in place. Staff can also manually operate the circuit breaker 37 via the manual control lever 38 to quickly disconnect the faulty circuit. If temporary restoration or adjustment of the line is required, the transfer and control of the power distribution line can be completed through the outgoing terminal 32.

[0035] Throughout the entire operation of the device, the horizontal grounding terminal 10 at the rear of the drawer-type component compartment 7, the middle component compartment 8, and the bottom support platform 9 transmits the static electricity and fault leakage current generated by the operation of each mechanism to the vertical grounding terminal 11, and then into the ground through the grounding support foot 5, forming an all-round grounding loop. The intelligent sensor monitors the operating status of the grounding loop in real time. If problems such as poor grounding occur, an early warning can be triggered in time to avoid leakage affecting the operation of the equipment and the accuracy of detection. The wiring box 12 and the side wiring end 30 arrange the connection lines between the components in a neat manner to ensure the smooth transmission of signals and control commands, and to ensure that the actions of each link are synchronized and the commands are accurate.

[0036] Throughout the entire operation, the control panel 2 allows for the input of manual operation commands, the external interface 17 supports the device and the power distribution backend of the power system, the movable wheels 6 can adjust the position of the device according to the operation requirements, the intelligent sensors and various detection, control and execution components form a full-process signal linkage, and each component has a clear division of labor and works together to realize the intelligent and automated detection, line selection and control of small current grounding faults, which greatly improves the efficiency of fault handling.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A power system intelligent low-current grounding fault detection and line selection control device, comprising a housing (1), characterized in that: An operation panel (2) is fixedly installed on the upper end of the housing (1). A display unit (3) is fixedly installed on the upper end of the operation panel (2). Side guards (4) are fixedly installed on all four corners of the operation panel (2). An external interface (17) is provided on the front surface of the housing (1). A caster wheel (6) is rotatably installed on the lower end of the housing (1). A drawer-type component compartment (7) is slidably installed on the upper end of the interior of the housing (1). An electrical management and fault execution mechanism is fixedly installed inside the drawer-type component compartment (7). The interior of the housing (1) is located in the drawer-type component compartment (7). A sliding guide rail (13) is slidably installed at the lower end. A middle-layer component compartment (8) is fixedly installed at the upper end of the sliding guide rail (13). A core control mechanism is slidably installed inside the middle-layer component compartment (8). A bottom support platform (9) is fixedly installed at the bottom end of the box (1). An execution drive mechanism is fixedly installed at the upper end of the bottom support platform (9). A wiring box (12) is fixedly installed on the rear surface of the inner wall of the box (1). The wiring box (12) is fixedly installed at the rear end of the drawer-type component compartment (7), the middle-layer component compartment (8), and the bottom support platform (9).

2. The intelligent low-current grounding fault detection and line selection control device for power systems according to claim 1, characterized in that: A side cable end (30) is fixedly installed on one side of the upper end of the wiring box (12). The wiring box (12) and the side cable end (30) are fixedly installed at the rear end of the middle component compartment (8). The lower end of the side cable end (30) is fixedly installed on the upper end of the bottom support platform (9).

3. The intelligent low-current grounding fault detection and line selection control device for power systems according to claim 1, characterized in that: The electrical management and fault execution mechanism also includes an ammeter indicator (34) fixedly installed at one end of the upper surface of the drawer-type component compartment (7). A fuse (33) is fixedly installed on the upper surface of the drawer-type component compartment (7) at the rear end of the ammeter indicator (34). A fixing plate (36) is fixedly installed on one side of the upper surface of the inner wall of the drawer-type component compartment (7). A circuit breaker (37) is fixedly installed on one side of the fixing plate (36). A manual control lever (38) is movably installed on the upper end of the circuit breaker (37). The manual control lever (38) penetrates the outer surface of the box (1).

4. The intelligent low-current grounding fault detection and line selection control device for power systems according to claim 3, characterized in that: The drawer-type component compartment (7) has an inlet terminal (31) on the right rear end and an outlet terminal (32) on the left rear end. A current transformer (35) is fixedly installed on the upper surface of the drawer-type component compartment (7) between the fuse (33) and the circuit breaker (37).

5. The intelligent low-current grounding fault detection and line selection control device for power systems according to claim 1, characterized in that: The core control mechanism also includes a slide groove (18) on both sides of the inner wall of the housing (1). The sliding guide rail (13) is slidably installed on the upper end of the slide groove (18). A detection plate (14) is slidably installed on the upper end of the inner wall of the middle component compartment (8). An electronic control board (15) is slidably installed on the inner wall of the middle component compartment (8) below the detection plate (14). A cable selection board (16) is slidably installed on the inner wall of the middle component compartment (8) below the electronic control board (15). The cable box (12) is connected to the rear end of the detection plate (14), the electronic control board (15), and the cable selection board (16), respectively.

6. The intelligent low-current grounding fault detection and line selection control device for power systems according to claim 1, characterized in that: The actuator also includes a horizontal grounding terminal (10) fixedly installed on one side of the bottom support platform (9). A grounding support foot (5) is fixedly installed at the lower end of the horizontal grounding terminal (10). A relay (19) is fixedly installed on the upper surface of the bottom support platform (9). A line switch (22) is fixedly installed on the upper surface of the bottom support platform (9) on the side of the relay (19). A signal collector (25) is fixedly installed on the side of the relay (19). An auxiliary circuit mechanism is fixedly installed at the upper end of the signal collector (25). A contactor (20) and a terminal block (21) are fixedly installed on the upper surface of the bottom support platform (9) on the side of the relay (19).

7. The intelligent low-current grounding fault detection and line selection control device for power systems according to claim 6, characterized in that: The auxiliary circuit mechanism also includes a signal acquisition interface (26) fixedly installed on the upper end of the signal collector (25). The inner wall of the signal acquisition interface (26) is symmetrically provided with fixing lugs (27). The outer surface of the signal acquisition interface (26) is provided with sampling and holding modules (29) symmetrical to the fixing lugs (27). The upper end of the relay (19) is fixedly installed with a switch piece (28). The upper end of the outgoing switch (22) is rotatably installed with a connecting plate (23). A telescopic pole (24) is rotatably installed between the connecting plate (23) and the signal collector (25).

8. The intelligent low-current grounding fault detection and line selection control device for power systems according to claim 1, characterized in that: The drawer-type component compartment (7), the middle component compartment (8), and the bottom support platform (9) are all fixedly installed with horizontal grounding terminals (10). The inner wall of the box (1) is fixedly installed with vertical grounding terminals (11). The three horizontal grounding terminals (10) are fixedly installed on the front surface of the vertical grounding terminals (11).

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