Underground cable grounding device

Abstract

The application relates to the technical field of power construction auxiliary tools, and proposes an underground cable grounding device, which comprises an isolating switch used for realizing on-off control of a grounding loop; a cable clamping component connected with the isolating switch and used for positioning and clamping a cable; a switch operating mechanism arranged on the isolating switch and used for manual operation to close or open the isolating switch; a mechanical locking assembly arranged on the switch operating mechanism and used for locking the switch operating mechanism to prohibit isolating switch operation; an insulating operating rod used for being connected to the cable clamping component and used for triggering the mechanical locking assembly to release the locking of the switch operating mechanism through a pressing action; a grounding connection wire with one end connected to an output end of the isolating switch and the other end used for being connected to a grounding stake to form the grounding loop; and a state indicator arranged on the isolating switch and used for indicating the on-off state of the grounding loop. The underground cable grounding device can improve power maintenance operation efficiency and safety and meet different scene requirements.

Description

Technical Field

[0001] This application relates to the field of power construction auxiliary tools technology, and more specifically, to an underground cable grounding device. Background Technology

[0002] Currently, with the increasing cable penetration rate of urban power grids (reaching 68%), the frequency of underground cable maintenance and grounding operations has surged. Traditional grounding methods face three major challenges: high operational risk: manual installation and removal of grounding wires requires direct contact with exposed conductors, posing a risk of residual charge release (discharge energy > 10J); low efficiency: single-circuit grounding operations take > 8 minutes, affecting the progress of large-scale power outage maintenance; and insufficient reliability: conventional grounding wire connection resistance fluctuations > 30%, and the probability of insulation failure in humid environments reaches 17%.

[0003] It is evident that there is an urgent need to develop new underground cable grounding devices to ensure maintenance safety, improve operation and maintenance efficiency, and adapt to complex working conditions. Utility Model Content

[0004] To address at least one of the aforementioned technical problems, this application proposes an underground cable grounding device.

[0005] In view of this, this application proposes an underground cable grounding device, comprising: a disconnecting switch for controlling the on / off state of the grounding circuit; a cable clamping component connected to the disconnecting switch for positioning and clamping the cable; a switch operating mechanism disposed on the disconnecting switch for manual operation to close or open the disconnecting switch; a mechanical locking component disposed on the switch operating mechanism for locking the switch operating mechanism to prevent the disconnecting switch from operating; an insulating operating rod connected to the cable clamping component for triggering the mechanical locking component to release the lock on the switch operating mechanism by pressing down; a grounding connection wire, one end of which is connected to the output terminal of the disconnecting switch, and the other end of which is connected to a grounding stake to form a grounding circuit; and a status indicator disposed on the disconnecting switch for indicating the on / off state of the grounding circuit.

[0006] In some feasible implementations, the disconnector is a double-break high-voltage switch.

[0007] In some feasible implementations, a double-break high-voltage switch includes two sets of contact structures for maintaining electrical isolation when one set of contact structures is fused together.

[0008] In some feasible implementations, the cable clamping component includes a V-shaped spring-loaded gripper structure, the gripping surface of which is provided with anti-slip texture to accommodate exposed conductors of cables of different diameters.

[0009] In some feasible implementations, the mechanical locking assembly includes: a locking lever, one end of which is connected to a clamping state detection mechanism of the cable clamping component, and the other end of which is inserted into a locking hole of the switch operating mechanism; and a return spring for automatically restoring the locking lever to its locked state when the cable clamping component releases its clamp.

[0010] In some feasible implementations, the status indicator includes: an LED indicator that displays the on / off status of the grounding loop using red and green colors; and a buzzer that provides an audible and visual alarm when the grounding loop is abnormally disconnected.

[0011] In some feasible implementations, the underground cable grounding device also includes a wireless remote controller for sending control commands to the disconnecting switch, which then performs the switching action according to the control commands.

[0012] In some feasible implementations, the insulating operating rod is a telescopic rod comprising multiple nested insulating tubes.

[0013] In some feasible implementations, the switch operating mechanism includes: a rotary handle with a surface provided with an anti-slip knurled pattern; and a limit block for limiting the rotation angle of the rotary handle.

[0014] In some feasible implementations, underground cable grounding devices also include: a voltage detector, used to connect to the cable to confirm whether the cable is de-energized.

[0015] Compared with related technologies, this application has the following advantages:

[0016] The cable grounding device provided in this application includes a disconnecting switch, cable clamping components, a switch operating mechanism, a mechanical interlocking assembly, an insulated operating rod, a grounding connection wire, and a status indicator. Through standardized operating procedures and multiple protection mechanisms, this cable grounding device can significantly improve the safety of power maintenance operations and increase operational efficiency, while also being compatible with both manual and electric modes to meet the needs of different scenarios.

[0017] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 A schematic diagram of an underground cable grounding device according to one embodiment of this application is shown.

[0020] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0021] 100 Disconnecting switch, 110 Cable clamping component, 120 Switch operating mechanism, 130 Mechanical interlocking assembly, 150 Status indicator, 152 LED indicator, 154 Buzzer. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0024] The following reference Figure 1 This application describes an underground cable grounding device according to some embodiments.

[0025] like Figure 1 As shown, this application proposes an underground cable grounding device, comprising: a disconnecting switch 100 for controlling the on / off state of the grounding circuit; a cable clamping component 110 connected to the disconnecting switch 100 for positioning and clamping the cable; a switch operating mechanism 120 disposed on the disconnecting switch 100 for manual operation to close or open the disconnecting switch 100; a mechanical locking component 130 disposed on the switch operating mechanism 120 for locking the switch operating mechanism 120 to prevent the disconnecting switch 100 from operating; an insulating operating rod connected to the cable clamping component 110 for triggering the mechanical locking component 130 to release the lock on the switch operating mechanism 120 by pressing down; a grounding connection wire, one end of which is connected to the output terminal of the disconnecting switch 100, and the other end of which is connected to a grounding stake to form a grounding circuit; and a status indicator 150 disposed on the disconnecting switch 100 for indicating the on / off state of the grounding circuit.

[0026] The underground cable grounding device provided in this application includes a disconnecting switch 100, a cable clamping component 110, a switch operating mechanism 120, a mechanical interlocking assembly 130, an insulating operating rod, a grounding connection wire, and a status indicator 150. By providing the mechanical interlocking assembly 130 on the switch operating mechanism 120, the lock on the switch operating mechanism 120 can be released when the insulating operating rod is pressed down, effectively preventing accidental closing or opening due to misoperation and enhancing safety during operation. The switch operating mechanism 120 allows the closing or opening of the disconnecting switch 100 to be achieved manually, making operation simple and direct, facilitating rapid response and handling by on-site personnel.

[0027] The cable clamping assembly positions and clamps the cable, ensuring its stability and reliability during grounding and preventing loosening or displacement from affecting the grounding effect. Connecting the output terminal of the disconnecting switch 100 to the grounding stake via the grounding connection wire forms a grounding loop, ensuring that current can be safely and effectively conducted to the earth, reducing the risk of electric shock. The status indicator 150 makes the on / off status of the grounding loop readily apparent, allowing operators to easily understand the working status of the grounding device and take timely appropriate measures.

[0028] The underground cable grounding device provided in this application, through standardized operating procedures and multiple protection mechanisms, can significantly improve the safety of power maintenance operations and increase operation and maintenance efficiency. It is also compatible with both manual and electric modes to meet the needs of different scenarios.

[0029] In some embodiments provided in this application, the disconnector 100 is a double-break high-voltage switch.

[0030] In this embodiment, the disconnector 100 is a double-break high-voltage switch. The double-break design provides both breaking capacity and arc-extinguishing performance, enabling rapid circuit interruption and effective suppression of electric arcs, thus ensuring operational safety. The double-break structure significantly improves the switch's insulation performance by increasing electrical clearance and creepage distance.

[0031] In some embodiments provided in this application, a double-break high-voltage switch includes two sets of contact structures for maintaining electrical isolation when one set of contact structures is fused together.

[0032] In this embodiment, the double-break high-voltage switch includes two sets of contact structures, improving the reliability of the high-voltage switch. When one set of contacts fuses due to overload, short circuit, or other abnormal conditions, the other set of contacts can still maintain electrical isolation, ensuring reliable circuit disconnection, preventing further escalation of the fault, and avoiding equipment damage or safety accidents. This redundant design provides an additional safety barrier for high-voltage electrical systems, ensuring the stability of power transmission and distribution. It is particularly suitable for scenarios with high requirements for power supply continuity, reducing the risk of power outages and maintenance costs caused by contact failures.

[0033] In some embodiments provided in this application, the cable clamping component 110 includes a V-shaped spring-loaded gripper structure, wherein the gripping surface of the V-shaped spring-loaded gripper structure is provided with anti-slip texture to adapt to exposed conductors of cables of different diameters.

[0034] In this embodiment, the V-shaped spring-loaded gripper structure has adaptive adjustment capabilities. Its V-shaped structure can automatically adapt to exposed conductors of cables with different diameters, eliminating the need for frequent clamp changes and improving operational convenience and efficiency. The spring-loaded mechanism ensures that the grippers apply a stable and uniform clamping force to the cable, preventing cable loosening or poor contact due to insufficient clamping force and ensuring the reliability of the electrical connection. The anti-slip texture on the clamping surface further enhances friction, preventing cable displacement under vibration or external forces and improving clamping stability, making it particularly suitable for dynamic or complex environments.

[0035] In some embodiments provided in this application, the mechanical locking assembly 130 includes: a locking rod, one end of which is connected to the clamping state detection mechanism of the cable clamping component 110, and the other end of which is inserted into the locking hole of the switch operating mechanism 120; and a return spring, which is used to automatically restore the locking state of the locking rod when the cable clamping component 110 is released from clamping.

[0036] In this embodiment, the mechanical interlocking assembly 130 includes a locking rod and a return spring. The locking rod directly associates the clamping state of the cable clamping component 110 with the switch operating mechanism 120, forming a mechanical interlocking mechanism. Only when the cable is reliably clamped will the locking rod disengage from the locking hole, allowing the operation of the isolating switch 100, effectively preventing safety risks caused by accidental operation of the switch due to the cable not being clamped. The return spring enables automated safety protection. When the cable clamping component 110 is released, the locking rod automatically returns to the locking hole under the spring force, relocking the switch operating mechanism 120. This avoids danger caused by human negligence in failing to restore the interlock in time, improving the safety and reliability of the entire grounding device operation and reducing potential hazards caused by human error.

[0037] In some embodiments provided in this application, the status indicator 150 includes: an LED indicator 152, which displays the on / off status of the grounding circuit through red and green dual colors; and a buzzer 154, which is used to issue an audible and visual alarm when the grounding circuit is abnormally disconnected.

[0038] In this embodiment, the status indicator 150 includes an LED indicator 152 and a buzzer 154. The red and green dual-color LED indicator 152 allows operators to quickly and clearly identify the continuity of the grounding circuit (e.g., green indicates a normally connected circuit, red indicates a disconnected circuit), avoiding operational risks due to misjudgment and improving operational efficiency and safety. When the grounding circuit is abnormally disconnected, the buzzer 154 immediately alerts the operator with a dual audible and visual alarm (e.g., a high-frequency buzzing sound + red flashing), preventing equipment damage or safety accidents caused by failure to detect the fault in time.

[0039] Through the synergistic effect of dual-color LEDs and buzzer 154, operators can quickly identify grounding status and abnormalities without relying on complex judgments, reducing safety hazards caused by misoperation or negligence.

[0040] In some embodiments provided in this application, the underground cable grounding device further includes: a wireless remote controller for sending control commands to the disconnect switch 100, and the disconnect switch 100 performs a switching action according to the control commands.

[0041] In this embodiment, the underground cable grounding device also includes a wireless remote controller for remotely controlling the disconnector switch 100. The wireless remote controller allows operators to send control commands to the disconnector switch 100 from a safe distance without having to approach the underground cable grounding device, thereby completing the opening and closing actions of the disconnector switch 100. This improves the convenience of operation and is especially suitable for scenarios where the device is installed in a complex location and is difficult for personnel to access directly.

[0042] The wireless remote control avoids direct contact between operators and high-voltage equipment, reducing the risk of electric shock and ensuring personnel safety. In handling faults or emergencies, it can quickly and remotely control the isolating switch 100 to promptly disconnect the grounding circuit and reduce the harm of accidents. In the face of emergencies, commands can be quickly issued via the wireless remote control to cause the isolating switch 100 to act rapidly and adjust the grounding status in a timely manner, improving the system's response capability to abnormal situations and ensuring the stable operation of the power system.

[0043] In some embodiments provided in this application, the insulating operating rod is a telescopic rod, comprising multiple nested insulating tubes.

[0044] In this embodiment, the telescopic pole structure has an adjustable length, allowing operators to flexibly adjust the pole length according to the actual installation height of the underground cable grounding device and the operating space, easily reaching different positions without the need for additional tools, thus significantly improving operational adaptability.

[0045] The multi-section nested design allows the insulated operating rod to be significantly shortened when not in use, taking up little space and making it easy to carry to different work sites. It is also easy to store in tool sheds or vehicles, saving space resources.

[0046] In some embodiments provided in this application, the switch operating mechanism 120 includes: a rotary handle, the surface of which is provided with an anti-slip knurled pattern; and a limiting block for limiting the rotation angle of the rotary handle.

[0047] In this embodiment, the switch operating mechanism 120 includes a rotary handle and a limit block. The anti-slip knurled texture on the surface of the rotary handle increases the friction between the operator's hand and the handle, effectively preventing slippage during operation. Especially in harsh environments such as dampness and oil, it ensures that the operator can rotate the rotary handle stably and accurately, reducing the risk of operational errors caused by handle slippage and ensuring operational safety.

[0048] The limit block precisely controls the opening and closing stroke of the switch by limiting the rotation angle of the rotary handle, preventing damage to the internal mechanical structure of the switch due to excessive rotation and extending the service life of the equipment; at the same time, it ensures that the switch operates reliably within the specified angle, so as to stably switch the grounding circuit and improve the reliability and stability of the entire underground cable grounding device.

[0049] In some embodiments provided in this application, the underground cable grounding device further includes: a voltage detector, used to connect to the cable to confirm whether the cable is de-energized.

[0050] In this embodiment, before operating the underground cable grounding device, connecting the voltage detector to the cable can accurately confirm whether the cable is de-energized. If the cable is still energized, it can promptly warn the operator, preventing grounding operations from being performed due to a misjudgment that the cable is de-energized, thereby preventing electric shock accidents and providing crucial protection for the operator's life safety.

[0051] The specific implementation plan is as follows:

[0052] I. Preparations before use

[0053] Equipment Inspection: Inspect cable clamp components, grounding connection wires, double-break high-voltage switches, and mechanical interlocking components. Test the accuracy of the constant current source (100mA) output from the grounding resistance detection module; error ≤ ±1%. Verify that the LED indicator (green / red) and buzzer (85dB) are functioning normally. Use a 500V megohmmeter to measure the insulation resistance of the insulating rod, operating rod interface, and grounding wire; ≥100MΩ is acceptable.

[0054] Standardized tools: 1.5m insulated operating rod (extendable to 3m, suitable for underground cable trench operations), grounding stake (galvanized steel pipe, diameter ≥25mm, length ≥1.5m, burial depth ≥0.8m), 433MHz wireless remote control (battery power ≥80%), motor drive module (protection level IP67).

[0055] Confirm that the target cable is de-energized and verify that there is no residual voltage using a voltage detector (10kV class). Remove any water and debris from the cable trench and ensure that there are no metal conductors within 0.5m of the grounding stake.

[0056] II. Installation and Grounding Operation Procedures

[0057] Step 1: Clamp the cable conductor

[0058] 1. Alignment and positioning: Align the V-shaped copper alloy jaws of the cable clamping component with the exposed conductor of the cable (diameter Φ20-50mm), and ensure that the opening direction of the jaws is perpendicular to the cable axis.

[0059] 2. Press down the operating lever: Use the insulated operating lever to press down the clamping module, compressing the spring (elastic force 50N) until the micro switch is triggered. A "click" sound indicates that the locking mechanism has released the switch operation permission.

[0060] 3. Locking verification: If the cable is not clamped, the locking mechanism will lock the switch operating handle and prevent it from turning.

[0061] Step 2: Connect the grounding loop

[0062] 1. Unfold the grounding wire: 25mm 2 One end of the copper stranded wire grounding conductor (with silicone rubber insulation) is connected to the output terminal of the double-break high-voltage switch, and the other end is connected to the grounding stake (tightening torque ≥20N·m).

[0063] 2. Closing the switch: Manual operation: Insert the insulating operating rod into the switch operating handle interface, rotate clockwise 45° to close the double-break switch, with a breaking time of <30ms (vacuum interrupter + magnetic blow arc guidance). Electric operation: Send a closing command via wireless remote control, and the motor drive module completes the switching action within 2 seconds.

[0064] 3. Status Confirmation: The LED indicator light is constantly green, indicating that the grounding resistance is ≤1Ω (the discharge circuit is reliable). The buzzer is silent, and there is no alarm signal.

[0065] Step 3: Grounding status monitoring: Real-time resistance monitoring: The grounding resistance detection module measures the loop resistance using a constant current source method (100mA), with a range of 0.1-10Ω and an accuracy of ±0.05Ω.

[0066] Alarm logic:

[0067] Resistance value (Ω) - Indicator light status - Buzzer operation - Handling measures

[0068] 0.1~1.0 - Green light always on - Silence - Normal grounding.

[0069] 1.0~5.0 - Red light flashing - 85dB / second - Check grounding connection and wire insulation.

[0070] >5.0 - Red light constantly on - 85dB / second - Immediately disconnect the switch and troubleshoot the fault.

[0071] III. Completion of Maintenance and Equipment Recovery

[0072] Step 1: Disconnect the grounding loop

[0073] 1. Manual operation: Use the insulated operating rod to rotate the switch operating handle counterclockwise 45° to disconnect the double-break switch. The disconnection time is <30ms.

[0074] 2. Electric operation (optional): The motor drive module completes the switching action within 2 seconds by sending a trip command via a wireless remote control.

[0075] Step 2: Release the cable clamp

[0076] 1. Release the lockout: After confirming that the switch is off, gently pull the insulating operating rod. The spring will automatically release the copper alloy claws and disconnect them from the cable conductor.

[0077] 2. Status Reset: The LED indicator goes out and the buzzer stops working, indicating that the grounding device has been completely disconnected from the system.

[0078] Step 3: Equipment Recycling and Maintenance

[0079] 1. Cleaning and rust prevention: Wipe the silver plating of the copper alloy claws with a non-woven cloth and spray with rust inhibitor (such as WD-40).

[0080] 2. Insulation test: Measure the insulation resistance of the grounding conductor again. ≥100MΩ is acceptable.

[0081] 3. Modular expansion: If you need to upgrade the wireless remote control function, replace the 433MHz communication module and test the transmission distance (≥100m).

[0082] IV. Safety Precautions and Emergency Response

[0083] 1. Key Security Rules

[0084] Operation under load is prohibited: When the locking mechanism is not released, it is strictly forbidden to forcibly turn the switch operating handle, otherwise it may cause mechanical damage or electric arc flashover.

[0085] Protection against humid environments: If the humidity of the cable trench is >85%, dry sandbags should be laid around the grounding stake to prevent moisture from entering the grounding circuit.

[0086] 2. Troubleshooting

[0087] Fault symptoms - Possible causes - Solutions

[0088] The switch cannot be closed - the locking mechanism has not been released - check if the clamping module is clamping the cable.

[0089] Grounding resistance > 1Ω - Grounding stake is loose or the wire is damaged - Tighten the grounding stake again and replace the grounding wire.

[0090] Status indicator light not lit - power module failure - replace 3V lithium battery (CR2032).

[0091] Wireless remote control failure - communication module interference - resend command within 1m of the device.

[0092] 3. Emergency Operations

[0093] Manual Reset Lockout: If a microswitch malfunction prevents the lockout from being released, an insulated tool can be used to short-touch the mechanical contacts of the microswitch (only in emergency situations).

[0094] Temporary grounding alternative: If the double-break switch is damaged, a 25mm wire can be used directly. 2 The copper stranded wire short-circuits the cable to the grounding stake, but the entire process requires a dedicated person to monitor it.

[0095] V. Summary of Innovations and Operational Advantages

[0096] Features - Technical Implementation - User Benefits

[0097] Quick clamping - spring-loaded copper alloy clamps (Φ20-50mm) - installation time <10 seconds, reducing the risk of human contact.

[0098] Mechanical-electric double interlocking - micro switch + interlocking mechanism - eliminates operation under load, error rate = 0.

[0099] Real-time resistance monitoring - constant current source method (0.1-10Ω) - fault response time <1 second, avoiding discharge failure.

[0100] Modular expansion - wireless remote control + motor drive - adaptable to complex working conditions such as underground / high-altitude environments.

[0101] With standardized operating procedures and multiple protection mechanisms, this underground cable grounding device can significantly improve the safety of power maintenance operations, while being compatible with both manual and electric modes to meet the needs of different scenarios.

[0102] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0103] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0104] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An underground cable grounding device, characterized in that, include: Disconnecting switches are used to control the on / off state of grounding circuits. A cable clamping component, connected to the disconnecting switch, is used to position and clamp the cable; A switch operating mechanism is provided on the disconnect switch for manual operation to close or open the disconnect switch; A mechanical interlocking assembly is provided on the switch operating mechanism to lock the switch operating mechanism to prevent the operation of the isolating switch. An insulating operating rod is used to connect to the cable clamping component and to trigger the mechanical locking assembly to release the lock on the switch operating mechanism by pressing down. A grounding connection wire is provided, with one end connected to the output terminal of the disconnecting switch and the other end connected to a grounding stake to form a grounding loop. A status indicator, located on the disconnecting switch, is used to indicate the on / off status of the grounding circuit.

2. The underground cable grounding device according to claim 1, characterized in that, The disconnecting switch is a double-break high-voltage switch.

3. The underground cable grounding device according to claim 2, characterized in that, The dual-break high-voltage switch includes: Two sets of contact structures are used to maintain electrical isolation when one set of contact structures is fused together.

4. The underground cable grounding device according to claim 1, characterized in that, The cable clamping component includes: The V-shaped spring-loaded clamping claw structure has anti-slip textures on its clamping surface to accommodate exposed conductors of cables of different diameters.

5. The underground cable grounding device according to claim 1, characterized in that, The mechanical interlocking assembly includes: The locking rod has one end connected to the clamping status detection mechanism of the cable clamping component, and the other end inserted into the locking hole of the switch operating mechanism; A return spring is used to automatically restore the locking state of the locking lever when the cable clamping component is released.

6. The underground cable grounding device according to any one of claims 1 to 5, characterized in that, The status indicator includes: LED indicator lights use red and green colors to show the on / off status of the grounding circuit; A buzzer is used to issue an audible and visual alarm when the grounding circuit is abnormally disconnected.

7. The underground cable grounding device according to any one of claims 1 to 5, characterized in that, Also includes: A wireless remote control is used to send control commands to the disconnect switch, and the disconnect switch performs the switching action according to the control commands.

8. The underground cable grounding device according to any one of claims 1 to 5, characterized in that, The insulating operating rod is a telescopic rod, comprising multiple nested insulating tubes.

9. The underground cable grounding device according to any one of claims 1 to 5, characterized in that, The switch operating mechanism includes: A rotary handle, the surface of which is provided with an anti-slip knurled pattern; A limiting block is used to limit the rotation angle of the rotary handle.

10. The underground cable grounding device according to any one of claims 1 to 5, characterized in that, Also includes: An electroscope is used to connect to a cable to confirm whether the cable is de-energized.

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