Temporary grounding device and temporary grounding device early warning system

Abstract

The application discloses a temporary grounding device and a temporary grounding device early warning system, and relates to the field of power grid maintenance.The temporary grounding device comprises a temporary grounding wire, a conductor clamp state monitoring assembly, a grounding resistance monitoring assembly and a processor, one end of the temporary grounding wire is installed on a power transmission line conductor, the other end of the temporary grounding wire is grounded, the conductor clamp state monitoring assembly is used for detecting the loosening state of the temporary grounding wire and the power transmission line conductor, the grounding resistance monitoring assembly is used for detecting the grounding state of the temporary grounding wire, the conductor clamp state monitoring assembly and the grounding resistance monitoring assembly are respectively electrically connected with the processor, the processor respectively analyzes whether the temporary grounding wire is in a stable grounding state or has been removed according to the loosening state signal transmitted by the conductor clamp state monitoring assembly and the grounding state signal transmitted by the grounding resistance monitoring assembly, the temporary grounding device early warning system remotely provides a preventive alarm sound and light prompt, ensures the safe operation of the power grid, and improves the life safety of maintenance personnel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system monitoring, in particular to a temporary grounding device and a temporary grounding device early warning system. BACKGROUND

[0002] The portable grounding wire is a safety barrier for protecting maintenance personnel, a lifeline for electric power workers, and can prevent adjacent high-voltage lines and equipment from generating induced voltage on the de-energized lines and equipment, or prevent sudden power supply to the de-energized lines from causing harm to the human body, while discharging the residual charge of the de-energized lines and equipment, thereby ensuring the safety of maintenance personnel.

[0003] Currently, there are two types of grounding wires in use: one is a portable grounding wire fixed by a hook-shaped plate spring clamping method; and the other is an operating rod grounding wire fixed by a bolt fastening clamping method. The portable grounding wire is usually suspended on a power transmission line several meters or even tens of meters from the ground. Due to the influence of wind and other factors, the grounding wire clamp may become loose or even fall off, thereby losing the safety protection function of the grounding wire and posing a serious threat to the personal safety of the operating personnel. Both types of grounding wire installation methods have the problem of poor contact of the conductor due to insufficient pressure, which leads to insecure contact between the overhead line conductor and the grounding wire clamp, resulting in induced voltage in the de-energized overhead line, causing unnecessary danger, or failing to provide safety protection when the de-energized operating section line is accidentally powered or misfed, resulting in personnel injury and damage to the line equipment.

[0004] The resistance value of the grounding discharge channel, i.e., the resistance value of the grounding resistor, directly affects the normal discharge of the line, equipment sudden power supply, residual charge, and induced power supply. The currently used grounding wire does not have a unified management function, and it is easy for the grounding wire to remain suspended on the power transmission line after the completion of maintenance work, causing electrical accidents such as the "12·15" grounding wire closing accident in Liupanshui Power Supply Bureau, which is the direct cause of the accident. The grounding wire on the line side of the 1852 knife switch of the T line of Hongtian II in Panguan substation 110kV was not removed.

[0005] Whether the contact between the portable grounding wire and the conductor is loose, whether the grounding wire can be safely removed after maintenance, and intelligent management of the above monitoring are related to the safe operation of the power grid and the safety of maintenance personnel. SUMMARY

[0006] Therefore, it is necessary to provide a temporary grounding device that can monitor the grounding reliability in real time during the maintenance of the power transmission line.

[0007] Meanwhile, a temporary grounding device early warning system that can monitor the grounding reliability in real time and whether the grounding wire is removed after maintenance is also provided.

[0008] The temporary grounding device comprises a temporary grounding wire, a conductor clamp state monitoring assembly, a grounding resistance monitoring assembly and a processor, one end of the temporary grounding wire is installed on a conductor of a power transmission line, the other end of the temporary grounding wire is grounded, the conductor clamp state monitoring assembly is used to detect a loosening state of the temporary grounding wire and the conductor of the power transmission line, the grounding resistance monitoring assembly is used to detect a grounding state of the temporary grounding wire, the conductor clamp state monitoring assembly and the grounding resistance monitoring assembly are respectively electrically connected to the processor, and the processor respectively analyzes whether the temporary grounding wire is in a stable grounding state or a removed state according to a loosening state signal transmitted by the conductor clamp state monitoring assembly and a grounding state signal transmitted by the grounding resistance monitoring assembly.

[0009] Preferably, the temporary grounding wire comprises a grounding wire and a U-shaped conductor clamp, one end of the grounding wire is installed with the U-shaped conductor clamp, the U-shaped conductor clamp is hung on the power transmission line to be maintained, and the other end of the grounding wire is grounded; the conductor clamp state monitoring assembly comprises a U-shaped body, a pair of high-position sensors and a pair of low-position sensors, the U-shaped body is attached to one side of the U-shaped conductor clamp, the pair of high-position sensors and the pair of low-position sensors are arranged on the U-shaped body, the pair of high-position sensors are away from the opening of the U-shaped body, the pair of low-position sensors are close to the opening of the U-shaped body, and the pair of high-position sensors and the pair of low-position sensors are respectively electrically connected to the processor, the U-shaped conductor clamp is in a stable clamping state by the processor through a mode that the pair of high-position sensors do not transmit signals to each other, and the U-shaped conductor clamp is in a loosening state by the processor through a process that the pair of low-position sensors transmit signals to each other from signal transmission to signal interruption.

[0010] Preferably, the wire clamp state monitoring assembly further comprises a pair of middle sensors mounted on the U-shaped body, a pair of high sensors, a pair of middle sensors and a pair of low sensors are arranged and mounted on the U-shaped body in sequence, the pair of middle sensors are located between the pair of high sensors and the pair of low sensors, the middle sensors are electrically connected with the processor, after the U-shaped wire clamp is hung on the conveying line, the conveying line blocks the pair of high sensors so that the pair of high sensors cannot form signal exchange of mutual transmission and reception, the two sensors of the pair of middle sensors can normally transmit and receive signals due to no blocking object, the pair of low sensors can normally form signal transmission and reception without blocking, the contact state of the wire clamp and the power line conductor is a good clamping state; the U-shaped wire clamp is affected by external force to make the pair of high sensors relatively higher than the power line conductor, so that the pair of high sensors change from no signal transmission to signal transmission, the pair of middle sensors change from signal transmission to no signal transmission, at this time, the contact state of the wire clamp and the power line conductor is a preliminary loose clamping state; the pair of high sensors have signal transmission, the pair of middle sensors have signal transmission, and the pair of low sensors change from no signal transmission to signal transmission, at this time, the contact state of the wire clamp and the power line conductor is a loose state.

[0011] Preferably, the grounding resistance monitoring assembly comprises an excitation module, a sampling module and a power supply, the excitation module, the sampling module and the power supply, a processor electrically connected with the excitation module and the sampling module respectively, the processor controls the excitation module to generate excitation, the power supply supplies power to the processor, the excitation module and the sampling module respectively, the excitation module comprises an AD9850 chip, a first low-pass filter, a power amplifier and a voltage clamp, the AD9850 chip is electrically connected with the first low-pass filter, the first low-pass filter is electrically connected with the power amplifier, the power amplifier is electrically connected with the voltage clamp, the AD9850 chip is electrically connected with the processor, the voltage clamp is sleeved on the grounding down conductor and is non-contact, the sampling module comprises an analog-digital conversion module, a second low-pass filter, a signal amplifier, a protection circuit, a sampling resistor and a current clamp, the analog-digital conversion module is electrically connected with the second low-pass filter, the second low-pass filter is electrically connected with the signal amplifier, the signal amplifier is electrically connected with the protection circuit, the protection circuit is electrically connected with the sampling resistor, the sampling resistor is electrically connected with the current clamp, the analog-digital conversion module is electrically connected with the processor, the current clamp is sleeved on the grounding down conductor and is non-contact, the processor controls the AD9850 chip to generate a sine wave, the sine wave passes through the low-pass filter and the power amplifier in turn to excite the coil of the voltage clamp to generate excitation, then the coil of the voltage clamp generates excitation induction voltage on the detection loop through mutual induction, the detection loop generates corresponding induction current under the action of the excitation induction voltage, the current clamp induces current signals from the detection loop through mutual induction, the current signals become voltage signals through the sampling resistor, the voltage signals pass through the signal amplifier and the low-pass filter in turn, and the voltage signals are input into the main control module through the analog-digital conversion module for multiple sampling operations to obtain the grounding resistance value.

[0012] A temporary grounding device early warning system comprises a plurality of temporary grounding devices, a plurality of communication modules, an Internet of Things, a big data server and a grounding wire intelligent management platform, the temporary grounding devices and the communication modules are in one-to-one correspondence and electrically connected, each communication module uploads the position information of the corresponding grounding wire state detection device, the real-time information of the U-shaped wire clamp state and the real-time information of the grounding resistance to the big data server through the Internet of Things, the grounding wire intelligent management platform obtains the above data from the big data server and manages, analyzes and remotely warns the above data, and realizes reliable grounding of the temporary grounding wire in the process of maintaining the power transmission line.

[0013] Preferably, the temporary grounding device early warning system further comprises a plurality of maintenance reporting modules, each maintenance reporting module is electrically connected with the corresponding communication module, before maintenance, the maintenance personnel presses the start switch of the maintenance reporting module, the maintenance reporting module generates a maintenance request signal and sends the signal to the communication module, the maintenance request signal is transmitted to the big data server through the communication module and the Internet of Things in turn, after the grounding wire intelligent management platform obtains the maintenance request signal from the big data server, the maintenance time is controlled, when the preset maintenance time is about to be used up, the grounding wire intelligent management platform generates warning prompt information through detecting whether the real-time information of the U-shaped conductor clamp state or the real-time information of the grounding resistance of the above maintenance point still exists, and sends the warning prompt information to the maintenance reporting module through the Internet of Things and the communication module, the maintenance reporting module generates a warning sound to prompt the maintenance personnel to remove the temporary grounding device after completing the maintenance, the temporary grounding wire is removed in time after maintenance, so that the occurrence of the grounding wire closing accident is avoided, and the safety of the power grid is improved.

[0014] Preferably, the temporary grounding device early warning system further comprises a plurality of GPS modules and alarm modules, each GPS module and alarm module is electrically connected with the processor respectively, the GPS module is used for transmitting the geographical position information of the temporary grounding device to the communication module, the processor controls the alarm module to issue a warning prompt sound, or a warning prompt light, or a warning prompt sound and a warning prompt light according to the abnormal signal fed back by the conductor clamp state monitoring assembly, the grounding resistance monitoring assembly and the grounding wire intelligent management platform.

[0015] In the above-mentioned temporary grounding device, the tightness condition of the U-shaped conductor clamp is monitored online and continuously through the U-shaped conductor clamp state detection module, and whether the grounding resistance is within the normal range is detected online and continuously through the grounding resistance detection module, the information fed back by the U-shaped conductor clamp state detection module and the information fed back by the grounding resistance detection module are simultaneously statistically managed through the control module, preventive measures are given in advance, the safe operation of the power grid is ensured, and the life safety of the maintenance personnel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure block diagram of the temporary grounding device of the application.

[0017] Figure 2 It is the front view of the temporary grounding wire and the conductor clamp state monitoring assembly hanging on the power transmission line.

[0018] Figure 3 It is the perspective view of the temporary grounding wire and the conductor clamp state monitoring assembly hanging on the power transmission line.

[0019] Figure 4 It is the structure block diagram of the embodiment of the grounding resistance detection module.

[0020] Figure 5 is a preferred embodiment structure block diagram of the grounding resistance detection module.

[0021] Figure 6 is a system structure block diagram of the temporary grounding device early warning system.

[0022] In the figure: temporary grounding device 100, temporary grounding line 10, grounding line 11, U-shaped conductor clamp 12, conductor clamp state monitoring assembly 20, U-shaped body 21, a pair of high-level sensors 22, a pair of low-level sensors 23, a pair of middle-level sensors 24, grounding resistance monitoring assembly 30, excitation module 31, sampling module 32, power supply 33, AD9850 chip 311, first low-pass filter 312, power amplifier 313, voltage clamp 314, analog-to-digital conversion module 321, second low-pass filter 322, signal amplifier 323, protection circuit 324, sampling resistor 325, current clamp 326, processor 40, temporary grounding device early warning system 200, communication module 210, Internet of Things 220, big data server 230, grounding line intelligent management platform 240, maintenance reporting module 250, GPS module 260, alarm module 270. DETAILED DESCRIPTION

[0023] The technical solutions and technical effects of the embodiments of the application are further described in detail below in combination with the drawings of the application.

[0024] Referring to Figure 1 , the temporary grounding device 100 includes a temporary grounding line 10, a conductor clamp state monitoring assembly 20, a grounding resistance monitoring assembly 30, and a processor 40. One end of the temporary grounding line 10 is installed on a power line conductor, and the other end of the temporary grounding line 10 is grounded. The conductor clamp state monitoring assembly 20 is used to detect the loosening state of the temporary grounding line 10 and the power line conductor. The grounding resistance monitoring assembly 30 is used to detect the grounding state of the temporary grounding line 10. The conductor clamp state monitoring assembly 20 and the grounding resistance monitoring assembly 30 are respectively electrically connected to the processor 40. The processor 40 analyzes whether the temporary grounding line 10 is in a stable grounding state or has been removed according to the loosening state signal transmitted by the conductor clamp state monitoring assembly 20 and the grounding state signal transmitted by the grounding resistance monitoring assembly 30.

[0025] Referring to Figure 2 and Figure 3, the temporary grounding wire 10 comprises a grounding wire 11 and a U-shaped wire clamp 12, one end of the grounding wire 11 is provided with the U-shaped wire clamp 12, the U-shaped wire clamp 12 is hung on the power transmission line to be maintained, and the other end of the grounding wire 11 is grounded; the wire clamp state monitoring assembly 20 comprises a U-shaped body 21, a pair of high-position sensors 22 and a pair of low-position sensors 23, the U-shaped body 21 is adapted to the shape of the U-shaped wire clamp 12, and is attached to one side of the U-shaped wire clamp 12, the pair of high-position sensors 22 and the pair of low-position sensors 23 are arranged on the U-shaped body 21, the pair of high-position sensors 22 are away from the opening of the U-shaped body 21, and the pair of low-position sensors 23 are close to the opening of the U-shaped body 21, the pair of high-position sensors 22 and the pair of low-position sensors 23 are electrically connected with the processor 40, the processor 40 monitors that the U-shaped wire clamp 12 is in a stable clamping state by the fact that the pair of high-position sensors 22 do not transmit signals to each other, and the processor 40 monitors that the U-shaped wire clamp 12 is in a loose state by the fact that the pair of low-position sensors 23 transmit signals to each other from signal transmission to signal interruption.

[0026] Referring to Figure 2 and Figure 3 , the wire clamp state monitoring assembly 20 further comprises a pair of middle-position sensors 24, the middle-position sensors 24 are arranged on the U-shaped body 21, the pair of high-position sensors 22, the pair of middle-position sensors 24 and the pair of low-position sensors 23 are sequentially arranged on the U-shaped body 21, the pair of middle-position sensors 24 are located between the pair of high-position sensors 22 and the pair of low-position sensors 23, and the middle-position sensors 24 are electrically connected with the processor 40, after the U-shaped wire clamp 12 is hung on the power transmission line, the power transmission line blocks the pair of high-position sensors 22, so that the pair of high-position sensors 22 cannot exchange signals, the pair of middle-position sensors 24 can normally transmit and receive signals, and the pair of low-position sensors 23 can normally exchange signals, at this time, the processor 40 judges that the contact state of the U-shaped wire clamp 12 and the power transmission line is a good clamping state; the U-shaped wire clamp 12 is affected by external force, so that the pair of high-position sensors 22 are relatively high above the power transmission line, the pair of high-position sensors 22 change from no signal transmission to signal transmission, the pair of middle-position sensors 24 change from signal transmission to no signal transmission, at this time, the processor 40 judges that the contact state of the U-shaped wire clamp 12 and the power transmission line is a preliminary loose clamping state; the pair of high-position sensors 22 have signal transmission, the pair of middle-position sensors 24 have signal transmission, and the pair of low-position sensors 23 change from no signal transmission to signal transmission, at this time, the processor 40 judges that the contact state of the U-shaped wire clamp 12 and the power transmission line is a state of being about to be loosened.

[0027] Referring to Figure 4 and Figure 5The grounding resistance monitoring assembly 30 comprises an excitation module 31, a sampling module 32 and a power supply 33, the processor 40 is electrically connected with the excitation module 31 and the sampling module 32 respectively, the processor 40 controls the excitation module 31 to generate excitation, the power supply 33 supplies power to the processor 40, the excitation module 31 and the sampling module 32 respectively, the excitation module 31 comprises an AD9850 chip 311, a first low-pass filter 312, a power amplifier 313 and a voltage clamp 314, the AD9850 chip 311 is electrically connected with the first low-pass filter 312, the first low-pass filter 312 is electrically connected with the power amplifier 313, the power amplifier 313 is electrically connected with the voltage clamp 314, the AD9850 chip 311 is electrically connected with the processor 40, and the voltage clamp 314 is sleeved on the grounding down conductor and is non-contact, the sampling module 32 comprises an analog-digital conversion module 321, a second low-pass filter 322, a signal amplifier 323, a protection circuit 324, a sampling resistor 325 and a current clamp 326, the analog-digital conversion module 321 is electrically connected with the second low-pass filter 322, the second low-pass filter 322 is electrically connected with the signal amplifier 323, the signal amplifier 323 is electrically connected with the protection circuit 324, the protection circuit 324 is electrically connected with the sampling resistor 325, the sampling resistor 325 is electrically connected with the current clamp 326, the analog-digital conversion module 321 is electrically connected with the processor 40, and the current clamp 326 is sleeved on the grounding down conductor and is non-contact, the processor 40 controls the AD9850 chip 311 to generate a sine wave, the sine wave sequentially passes through the first low-pass filter 312 and the power amplifier 313 to excite the coil of the voltage clamp 314 to generate excitation, then the coil of the voltage clamp 314 generates excitation induction voltage on the detection loop through mutual induction, the detection loop generates corresponding induction current under the action of the excitation induction voltage, the current clamp 326 induces current signals from the detection loop, the current signals become voltage signals through the sampling resistor 325, the voltage signals sequentially pass through the signal amplifier 323 and the second low-pass filter 322, and the voltage signals are input into the main control module for multiple sampling operations to obtain a value through the analog-digital conversion module 321.

[0028] Referring to Figure 6The temporary grounding device early warning system 200 comprises a plurality of temporary grounding devices 100, a plurality of communication modules 210, an Internet of Things 220, a big data server 230 and a grounding wire intelligent management platform 240. The temporary grounding device 100 and the communication module 210 are in one-to-one correspondence and electrically connected. Each communication module 210 uploads the position information of the device for detecting the state of the grounding wire 11, the real-time information of the state of the U-shaped wire clamp 12 and the real-time information of the grounding resistance to the big data server 230 through the Internet of Things 220. The grounding wire intelligent management platform 240 obtains the above data from the big data server 230 and stores, manages, analyzes and remotely warns the above data, so as to realize reliable grounding of the temporary grounding wire 10 in the process of maintaining the power transmission line.

[0029] Referring to Figure 6 The temporary grounding device early warning system 200 further comprises a plurality of maintenance reporting modules 250. Each maintenance reporting module 250 is electrically connected with the corresponding communication module 210. Before maintenance, the maintenance personnel presses the starting switch of the maintenance reporting module 250. The maintenance reporting module 250 generates a maintenance request signal and sends the signal to the communication module 210. The maintenance request signal is transmitted to the big data server 230 through the communication module 210 and the Internet of Things 220 in turn. After the grounding wire intelligent management platform 240 obtains the maintenance request signal from the big data server 230, the maintenance time is controlled. When the preset maintenance time is about to be used up, the grounding wire intelligent management platform 240 gives a warning prompt after detecting whether there is real-time information of the state of the U-shaped wire clamp 12 or real-time information of the grounding resistance at the maintenance point. The warning prompt is sent to the maintenance reporting module 250 through the Internet of Things 220 and the communication module 210. The maintenance reporting module 250 gives a warning sound to prompt the maintenance personnel to remove the temporary grounding device 100 after completing the maintenance, so as to realize timely removal of the temporary grounding wire 10 after maintenance, thereby avoiding the occurrence of the grounding wire closing accident and improving the safety of the power grid.

[0030] Referring to Figure 6 The temporary grounding device early warning system 200 further comprises a plurality of GPS modules 260 and alarm modules 270. Each GPS module 260 and alarm module 270 is electrically connected with the processor 40 respectively. The GPS module 260 is used for transmitting the geographical position information of the temporary grounding device 100 to the communication module 210. The processor 40 controls the alarm module 270 to give a warning prompt sound, or a warning prompt light, or a warning prompt sound and a warning prompt light according to the abnormal signals fed back by the wire clamp state monitoring assembly 20, the grounding resistance monitoring assembly 30 and the grounding wire intelligent management platform 240.

Claims

1. A temporary grounding device, characterized in that: The system includes a temporary grounding wire, a conductor clamp status monitoring component, a grounding resistance monitoring component, and a processor. One end of the temporary grounding wire is installed on the transmission line conductor, and the other end is grounded. The conductor clamp status monitoring component detects the looseness between the temporary grounding wire and the transmission line conductor, and the grounding resistance monitoring component detects the grounding status of the temporary grounding wire. Both the conductor clamp status monitoring component and the grounding resistance monitoring component are electrically connected to the processor. The processor analyzes whether the temporary grounding wire is in a stable grounding state or has been removed based on the looseness status signal transmitted by the conductor clamp status monitoring component and the grounding status signal transmitted by the grounding resistance monitoring component. The conductor clamp status monitoring component includes a U-shaped body, a pair of high-position sensors, a pair of mid-position sensors, and a pair of low-position sensors. The U-shaped body is fitted onto one side of the U-shaped conductor clamp. The pair of high-position sensors are located away from the opening of the U-shaped body, and the pair of low-position sensors are located near the opening of the U-shaped body. The pair of high-position sensors are electrically connected to the processor, and the mid-position sensor is mounted on the U-shaped body. A pair of mid-position sensors are located between a pair of high-position sensors and a pair of low-position sensors. The mid-position sensors are electrically connected to the processor. After the U-shaped wire clamp is attached to the transmission line, the transmission line blocks the pair of high-position sensors, preventing them from exchanging signals for transmission and reception. The two sensors in the pair of mid-position sensors can transmit and receive signals normally due to the lack of obstruction. The pair of low-position sensors can also transmit and receive signals normally without obstruction. The contact state between the wire clamp and the transmission line conductor is a good clamping state. When the U-shaped wire clamp is affected by external force, the pair of high-position sensors are relatively higher than the transmission line conductor, causing the signal transmission between the pair of high-position sensors to change from no signal transmission to signal transmission, and the signal transmission between the pair of mid-position sensors to change from signal transmission to no signal transmission. At this point, the contact state between the wire clamp and the transmission line conductor is a preliminary loosening clamping state. When there is signal transmission between the pair of high-position sensors, between the pair of mid-position sensors, and between the pair of low-position sensors, the contact state between the wire clamp and the transmission line conductor is about to loosen.

2. The temporary grounding device as described in claim 1, characterized in that: The grounding resistance monitoring component includes an excitation module, a sampling module, and a power supply. A processor is electrically connected to both the excitation and sampling modules, controlling the excitation module to generate excitation. The power supply provides power to the processor, excitation module, and sampling module. The excitation module includes an AD9850 chip, a first low-pass filter, a power amplifier, and a voltage clamp. The AD9850 chip is electrically connected to the first low-pass filter, the first low-pass filter is electrically connected to the power amplifier, the power amplifier is electrically connected to the voltage clamp, and the AD9850 chip is electrically connected to the processor. The voltage clamp is looped around the grounding lead without contact. The sampling module includes an analog-to-digital converter module, a second low-pass filter, a signal amplifier, a protection circuit, a sampling resistor, and a current clamp. The analog-to-digital converter module is electrically connected to the second low-pass filter. The device and signal amplifier are electrically connected; the signal amplifier and protection circuit are electrically connected; the protection circuit and sampling resistor are electrically connected; the sampling resistor and current clamp are electrically connected; the analog-to-digital converter module and processor are electrically connected. The current clamp is looped around the grounding lead without contact. The processor controls the AD9850 chip to generate a sine wave. The sine wave passes through a low-pass filter and a power amplifier to excite the coil of the voltage clamp. Then, the coil of the voltage clamp generates an excitation induced voltage in the detection circuit through mutual inductance. Under the action of the excitation induced voltage, the detection circuit generates a corresponding induced current. The current clamp mutually inducts a current signal from the detection circuit. The current signal is converted into a voltage signal through the sampling resistor. The voltage signal passes through a signal amplifier and a low-pass filter. The voltage signal is then input to the main control module through the analog-to-digital converter module for multiple sampling calculations to obtain the grounding resistance value.

3. An early warning system for a temporary grounding device, characterized in that: The system includes multiple temporary grounding devices as described in claim 1 or 2, multiple communication modules, an Internet of Things (IoT), a big data server, and a grounding wire intelligent management platform. The temporary grounding devices and communication modules are electrically connected and correspond one-to-one. Each communication module uploads the location information of the corresponding grounding wire status detection device, the real-time information of the U-shaped conductor clamp status, and the real-time information of the grounding resistance to the big data server via the IoT. The grounding wire intelligent management platform obtains data from the big data server and manages, analyzes, and remotely warns of the data, ensuring reliable grounding of the temporary grounding wire during transmission line maintenance. The early warning system for the temporary grounding devices also includes multiple maintenance reporting modules, each electrically connected to a corresponding communication module. Before maintenance, maintenance personnel press the button on the maintenance reporting module. When the switch is activated, the maintenance reporting module generates a maintenance request signal and sends it to the communication module. The maintenance request signal is then transmitted sequentially through the communication module and the Internet of Things (IoT) to the big data server. After the grounding wire intelligent management platform obtains the maintenance request signal from the big data server, it begins to manage the maintenance time. When the preset maintenance time is about to expire, the grounding wire intelligent management platform issues an alert by detecting real-time information on the status of the U-shaped conductor clamp or the real-time grounding resistance at the maintenance point. This alert is then sent to the maintenance reporting module via the IoT and communication modules. The maintenance reporting module emits an alarm sound to prompt maintenance personnel to remove the temporary grounding device after completing the maintenance. This ensures the timely removal of the temporary grounding wire after maintenance, thereby preventing accidents caused by closing the circuit with the grounding wire still attached and improving the safety of the power grid.

4. The early warning system for the temporary grounding device as described in claim 3, characterized in that: The early warning system for temporary grounding devices also includes multiple GPS modules and alarm modules. Each GPS module and alarm module is electrically connected to the processor. The GPS module is used to transmit the geographical location information of the temporary grounding device to the communication module. Based on the abnormal signals fed back by the conductor clamp status monitoring component, the grounding resistance monitoring component, and the intelligent grounding wire management platform, the processor controls the alarm module to issue an alarm sound, an alarm light, or both an alarm sound and an alarm light.

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