A power distribution cable discharge defect early warning method and device

Abstract

A power distribution cable discharge defect early warning method and device, the method comprises the following steps: collecting the electromagnetic wave traveling wave signal generated by the cable defect discharge source, and recording the electromagnetic wave signal waveform data; according to the electromagnetic wave signal waveform data, the time delay value estimation method is used to calculate the time delay value of the discharge source traveling wave propagation between two signal collection receiving devices, and the position of the discharge source is calculated; early warning according to the discharge source position, wherein the early warning includes: the position of the discharge source and the early warning level. The automatic diagnosis alarm function can help technicians quickly master the cable operation situation.

Description

Technical Field

[0001] This invention relates to the field of discharge diagnosis in power systems, and specifically to a method and device for early warning of discharge defects in distribution cables. Background Technology

[0002] With the continuous development of technology and urban power grids, a large number of overhead power lines in urban areas are being upgraded and replaced with cable lines. Power cables offer greater transmission capacity and distance, becoming a crucial component of the power distribution network system. To promote urbanization and ensure people's quality of life and personal safety, the demand for and reliance on electricity is increasing. However, cable faults are gradually becoming a major source of power accidents, easily causing personal injury and equipment failure, leading to significant economic losses.

[0003] In power distribution systems, due to the complex operating environment of distribution cables, the insulation system gradually ages over time, leading to partial discharge that propagates along the cable itself. If not detected in time, this hazard can escalate and cause faults and accidents. Therefore, monitoring for discharge hazards is necessary to detect their location early and prevent faults.

[0004] Prior art document 1 (CN 104965160 B) discloses a method and device for detecting partial discharge in cables. It involves applying a periodically varying exponential waveform voltage to the cable under test; exciting the partial discharge signal of the insulated cable under test with the exponential waveform voltage at the rising or falling edge of the exponential waveform; collecting and recording the partial discharge signal; analyzing the partial discharge characteristic parameters of the partial discharge defects; and using a pattern recognition algorithm to evaluate the insulation state of the test cable. The drawback of prior art document 1 is that it relies on an externally applied voltage to detect changes in characteristic quantities, which may damage the cable's insulation. Furthermore, it is not easily implemented for online monitoring.

[0005] Prior art document 2 (CN107329052A) discloses a method for estimating the time delay value of discharge electromagnetic waves based on analog signals. This invention involves two sensors receiving electromagnetic wave signals generated by discharge and recording them as default analog signals. The received analog signals are converted into two sine wave signals by a bandpass filter with a bandwidth of 400-600MHz. The two sine wave signals are then passed through a local oscillator (300MHz). The signal passing through the local oscillator is then passed through a low-pass filter with an intermediate frequency of 100MHz. The resulting signal and signal v21(t) are orthogonally detected and passed through a low-pass filter again. The phase difference between the signals, i.e., the time delay value of the original signal, is calculated using the above formula. The drawback of prior art document 2 is that it is a non-contact detection method, utilizing the spatial propagation characteristics of electromagnetic wave signals to acquire and process the signals. Its applicability to cable detection needs further confirmation. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method and device for early warning of discharge defects in power distribution cables, which enables technicians to quickly locate the source of the discharge and detect potential defects early, thus providing risk warning.

[0007] The present invention adopts the following technical solution.

[0008] A method for early warning of discharge defects in power distribution cables includes the following steps:

[0009] Collect the traveling electromagnetic wave signal generated by the power source of the cable defect discharge, and record the electromagnetic wave signal waveform data;

[0010] Based on the electromagnetic wave signal waveform data, the time delay value of the traveling wave of the discharge source reaching the two signal acquisition and receiving devices is calculated by the time delay value estimation method, and the position of the discharge source is calculated.

[0011] Early warnings are issued based on the location of the power source, and the warning includes the location of the power source and the warning level.

[0012] Preferably, based on the electromagnetic wave signal waveform data, the time delay value between the propagation of the traveling wave from the discharge source and the arrival at the two signal acquisition and receiving devices is calculated using a time delay value estimation method. This includes: using the weight ratio of the long and short dimensions of the waveform convolved with the energy of the electromagnetic wave propagation generated by the discharge to obtain the time delay value of the traveling wave arriving at the two signal acquisition devices. The calculation formula is as follows:

[0013]

[0014]

[0015]

[0016]

[0017] In the formula,

[0018] j represents the selected length of the discharge electromagnetic wave waveform.

[0019] n represents the relatively short size weight.

[0020] n+L represents a relatively long dimension weight.

[0021] i represents a point on the waveform.

[0022] L represents a certain weighting value.

[0023] E 2 (i) represents the energy value of the waveform at point i.

[0024] C(j) represents energy convolution.

[0025] S n (j) represents the energy value of the waveform at length j.

[0026] F n (j) represents the energy value after adding a longer dimension weight.

[0027] R n (j) represents the energy ratio;

[0028] By performing the above operation on each received waveform, a maximum energy spectrum peak value is obtained, and the time difference between the energy spectrum peak values ​​of the two waveforms is used as the time delay value.

[0029] Preferably, the location of the discharge power source is calculated based on the time delay value, the sensor placement position, and the distance between the sensors on both sides of the cable. The specific formula is as follows:

[0030] l=(s-Δt×v) / 2

[0031] l represents the distance from the power source to the sensor.

[0032] 's' represents the distance between the sensors on both sides of the cable.

[0033] Δt represents the estimated time delay value.

[0034] v represents the propagation speed of electromagnetic waves.

[0035] Preferably, the early warning is based on the location of the discharge source, specifically including: when a discharge signal is detected, it indicates a Level 1 early warning; when a discharge is detected, the amplitude of the continuously monitored discharge signal gradually increases, indicating a Level 2 early warning; when the amplitude of the continuously monitored discharge signal increases and the number of discharges in the same time interval increases, it indicates a Level 3 early warning.

[0036] A discharge defect early warning device for power distribution cables includes: a signal acquisition device, an edge processing device, and a communication device, wherein...

[0037] The signal acquisition device is used to acquire the traveling electromagnetic wave signal generated by the power supply of the cable defect discharge and to record the electromagnetic wave signal waveform data.

[0038] The edge processing device is used to calculate the time delay between the traveling wave of the discharge source and the two signal acquisition and receiving devices based on the electromagnetic wave signal waveform data and the time delay estimation method, and to calculate the location of the discharge source.

[0039] The communication device is used to upload the obtained discharge location results to the remote cable operation status management system for early warning.

[0040] Preferably, the signal acquisition device includes an ultra-high frequency sensor and an ultra-high frequency signal acquisition unit;

[0041] Ultra-high frequency sensors are used to receive ultra-high frequency electromagnetic waves generated by the power supply.

[0042] The UHF signal acquisition unit is used to sample and record the traveling wave signal received by the UHF sensor to obtain the waveform data of the signal.

[0043] The frequency range of the UHF signal acquisition device is 30MHz-800MHz; the UHF signal acquisition device is equipped with GPS synchronization time function.

[0044] The early warning device also includes a cable operation status management system.

[0045] The cable operation status management system is used to issue early warnings based on discharge detection signals. When a discharge is detected, it indicates a Level 1 warning; when the amplitude of the discharge signal gradually increases after a discharge is detected, it indicates a Level 2 warning; when the amplitude of the discharge signal increases continuously and the number of discharges in the same time interval increases, it indicates a Level 3 warning.

[0046] A terminal includes a processor and a storage medium; wherein,

[0047] Storage media are used to store instructions;

[0048] The processor is configured to operate according to the instructions to perform the steps of a method for early warning of discharge defects in power distribution cables.

[0049] A computer-readable storage medium having a computer program stored thereon, characterized in that, when executed by a processor, the program implements the steps of a method for early warning of discharge defects in power distribution cables.

[0050] The beneficial effects of this invention are that, compared with the prior art,

[0051] This invention utilizes the weight ratio of the long and short dimensions of the convolutional waveform of the electromagnetic wave propagating from the discharge to obtain the time delay value of the traveling wave reaching two signal acquisition devices. Based on the device placement, the location of the discharge source is determined, and the result is transmitted to the cable management system for early warning. This automatic diagnostic alarm function allows technicians to quickly grasp the cable's operating status and provide appropriate handling strategies based on the severity of the warning. The discharge defect early warning method for distribution cables of this invention can be controlled in real time by a self-developed software program, and the entire process can be completed automatically with a single click, providing a new means for the operation and maintenance of distribution cable lines. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the structure of the power distribution cable discharge defect early warning device in one embodiment of the present invention;

[0053] Figure 2 This is a flowchart illustrating one embodiment of the power distribution cable discharge defect early warning method of the present invention.

[0054] The attached figures are labeled as follows:

[0055] 1-Signal acquisition device; 2-Edge processing device; 3-Communication device. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0057] Example 1.

[0058] A method for early warning of discharge defects in power distribution cables. For example... Figure 1 As shown, it includes the following steps:

[0059] Collect the traveling electromagnetic wave signal generated by the power source of the cable defect discharge, and record the electromagnetic wave signal waveform data;

[0060] Based on the electromagnetic wave signal waveform data, the time delay value of the traveling wave of the discharge source reaching the two signal acquisition and receiving devices is calculated by the time delay value estimation method, and the position of the discharge source is calculated.

[0061] A time delay estimation method is used to obtain the time delay values ​​of the discharge signal reaching different acquisition devices. In this embodiment, preferably, the time delay values ​​of the traveling wave reaching the two signal acquisition devices are obtained by using the weight ratio of the long and short dimensions of the convolution waveform based on the energy of the traveling wave generated by the electromagnetic wave propagation during discharge. The calculation formula is as follows:

[0062]

[0063]

[0064]

[0065]

[0066] In the formula,

[0067] j represents the selected length of the discharge electromagnetic wave waveform.

[0068] n represents the relatively short size weight.

[0069] n+L represents a relatively long dimension weight.

[0070] i represents a point on the waveform.

[0071] L represents a certain weighting value.

[0072] E 2 (i) represents the energy value of the waveform at point i.

[0073] C(j) represents energy convolution.

[0074] S n (j) represents the energy value of the waveform at length j.

[0075] F n (j) represents the energy value after adding a longer dimension weight.

[0076] R n (j) represents the energy ratio.

[0077] By performing the above operation on each received waveform, a maximum energy spectrum peak can be obtained. The time difference between the energy spectrum peaks of two waveforms is the time delay value. Specifically, the energy ratio, when converted into a waveform, will generate an energy spectrum peak.

[0078] The edge processing device 2 calculates the location of the discharge point based on the time delay value, the position of the sensor arrangement, and the distance between the sensors on both sides of the cable.

[0079] l=(s-Δt×v) / 2

[0080] l represents the distance from the power source to the sensor.

[0081] 's' represents the distance between the sensors on both sides of the cable.

[0082] Δt represents the estimated time delay value.

[0083] v represents the propagation speed of electromagnetic waves.

[0084] Early warnings are issued based on the location of the power source, and the warning includes the location of the power source and the warning level.

[0085] Warning levels include: Level 1 warning is indicated when a discharge signal is detected;

[0086] Once a discharge signal is detected, a gradual increase in the amplitude of the continuously monitored signal indicates a Level 2 warning.

[0087] A Level 3 warning is indicated when the amplitude of the discharge signal increases and the number of discharges increases within the same time interval.

[0088] Example 2.

[0089] A discharge defect early warning device for power distribution cables, such as Figure 2 As shown, the device includes: a signal acquisition and receiving device 1, an edge processing device 2, and a communication device 3.

[0090] Among them, the signal acquisition and receiving device 1 is used to receive the electromagnetic wave traveling wave signal generated by the cable defect discharge power supply and record the electromagnetic wave pulse signal propagation waveform data.

[0091] In this preferred embodiment, the signal receiving device 1 includes an ultra-high frequency sensor and an ultra-high frequency signal acquisition device. The ultra-high frequency signal acquisition device is equipped with GPS synchronization and time synchronization function and can transmit the signal to the edge processing device.

[0092] Ultra-high frequency sensors are used to receive ultra-high frequency electromagnetic waves generated by the power supply.

[0093] Ultra-high frequency signal acquisition devices have also become commonly used electronic measuring instruments in recent years. They can record electrical signal waveforms and are used to study the changing processes of various electrical phenomena.

[0094] In this embodiment, a high sampling frequency (30MHz-800MHz) ultra-high frequency acquisition device is selected to sample and record the traveling wave signal received by the ultra-high frequency sensor to obtain the waveform data of the signal.

[0095] The edge processing device 2 is used to receive waveform data transmitted from the UHF signal acquisition device. Through the GPS time synchronization function, it can acquire waveform data from electromagnetic waves generated by the same power source that reach multiple acquisition devices.

[0096] In this embodiment, the edge processing device can preferably be an edge gateway processor with communication capabilities.

[0097] The edge processing device 2 can use a time delay estimation method to obtain the time delay value of the discharge signal reaching different collectors.

[0098] In this preferred embodiment, the time delay value of the traveling wave arriving at the two signal acquisition devices is obtained by using the long-size / short-size weight ratio of the convolution waveform based on the energy of the traveling wave propagating from the electromagnetic wave generated by the discharge.

[0099] The edge processing device 2 calculates the location of the discharge point based on the time delay value, the location of the collector, the length of the line, etc.

[0100] Communication device 3 typically uses wireless, 4G, 5G, or fiber optic connections to transmit the results calculated by edge processing device 2 to the cable operation status management system. The cable operation status management system is used to issue early warnings based on discharge detection signals. A Level 1 warning is indicated when a discharge is detected; a Level 2 warning is indicated when the amplitude of the continuously monitored discharge signal gradually increases after a discharge is detected; and a Level 3 warning is indicated when the amplitude of the continuously monitored discharge signal increases and the number of discharges within the same time interval increases.

[0101] Example 3.

[0102] Embodiment 3 of the present invention provides a computer-readable storage medium.

[0103] A computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps of a method for early warning of discharge defects in power distribution cables as described in Embodiment 1 of the present invention.

[0104] The detailed steps are the same as those provided in Example 1 for a method of early warning of discharge defects in power distribution cables, and will not be repeated here.

[0105] Example 4.

[0106] Embodiment 4 of the present invention provides an electronic device.

[0107] An electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps in the method for early warning of discharge defects in power distribution cables as described in Embodiment 1 of the present invention.

[0108] The detailed steps are the same as those provided in Example 1 for a method of early warning of discharge defects in power distribution cables, and will not be repeated here.

[0109] The beneficial effects of this invention are that, compared with the prior art, this invention obtains the time delay value of the traveling wave arriving at two signal acquisition devices based on the weight ratio of the long and short dimensions of the convolution waveform of the electromagnetic wave propagation energy generated by the discharge. Then, based on the device placement, the location of the discharge source is determined, and the result is transmitted to the cable management system for early warning. This automatic diagnostic alarm function allows technicians to quickly grasp the cable's operating status and provide the correct handling strategy based on the severity of the warning. The early warning method for discharge defects in distribution cables of this invention can be controlled in real time by a self-developed software program, and the entire process can be completed automatically with a single click, providing a new means for the operation and maintenance of distribution cable lines.

[0110] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0111] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0112] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0113] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0114] Various aspects of this disclosure are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0115] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0116] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0117] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for early warning of discharge defects in power distribution cables, characterized in that, Includes the following steps: Collect the traveling electromagnetic wave signal generated by the power source of the cable defect discharge, and record the electromagnetic wave signal waveform data; Based on the electromagnetic wave signal waveform data, the time delay value of the traveling wave of the discharge source reaching the two signal acquisition and receiving devices is calculated by the time delay value estimation method, and the position of the discharge source is calculated. The time delay of the traveling wave arriving at the two signal acquisition devices is obtained by using the weight ratio of the long and short dimensions of the convolution waveform based on the energy of the electromagnetic wave propagation generated by discharge. The calculation formula is as follows: In the formula, j represents the selected length of the discharge electromagnetic wave, n represents the relatively short size weight, n+L represents the relatively long size weight, i represents a point on the waveform, L represents a certain weighting value, and E 2 (i) represents the energy value of the waveform at point i, C(j) represents the energy convolution, and S n (j) represents the energy value of the waveform at length j, F n (j) represents the energy value after adding a longer dimension weight, R n (j) represents the energy ratio; by performing the above operation on each received waveform, a maximum energy spectrum peak is obtained, and the time difference between the energy spectrum peaks of the two waveforms is used as the time delay value; An early warning is issued based on the location of the discharge source, wherein the early warning includes: the location of the discharge source and the warning level.

2. The method for early warning of discharge defects in power distribution cables according to claim 1, characterized in that, The location of the discharge source can be calculated based on the time delay between the arrival of the traveling wave from the discharge source and the two signal acquisition and receiving devices, the sensor placement positions, and the distance between the sensors on both sides of the cable. The specific formula is as follows: l=(s-Δt×v) / 2 l represents the distance from the power source to the sensor. 's' represents the distance between the sensors on both sides of the cable. Δt represents the estimated time delay value. v represents the propagation speed of electromagnetic waves.

3. The method for early warning of discharge defects in power distribution cables according to claim 1, characterized in that, The warning is based on the location of the discharge source. Specifically, when a discharge signal is detected, it indicates a Level 1 warning; when a discharge is detected, the amplitude of the discharge signal gradually increases after continuous monitoring, indicating a Level 2 warning. A Level 3 warning is indicated when the amplitude of the continuously monitored discharge signal increases and the number of discharges increases within the same time interval.

4. A discharge defect early warning device for power distribution cables, comprising: The signal acquisition device (1), the edge processing device (2), and the communication device (3) are characterized in that, The signal acquisition device (1) is used to acquire the electromagnetic wave traveling wave signal generated by the cable defect discharge power supply and record the electromagnetic wave signal waveform data; The edge processing device (2) is used to calculate the time delay value between the two signal acquisition and receiving devices (1) based on the electromagnetic wave signal waveform data and the time delay value estimation method, and to calculate the position of the discharge source. The time delay of the traveling wave arriving at the two signal acquisition devices is obtained by using the weight ratio of the long and short dimensions of the convolution waveform based on the energy of the electromagnetic wave propagation generated by discharge. The calculation formula is as follows: In the formula, j represents the selected length of the discharge electromagnetic wave, n represents the relatively short size weight, n+L represents the relatively long size weight, i represents a point on the waveform, L represents a certain weighting value, and E 2 (i) represents the energy value of the waveform at point i, C(j) represents the energy convolution, and S n (j) represents the energy value of the waveform at length j, F n (j) represents the energy value after adding a longer dimension weight, R n (j) represents the energy ratio; by performing the above operation on each received waveform, a maximum energy spectrum peak is obtained, and the time difference between the energy spectrum peaks of the two waveforms is used as the time delay value; The communication device (3) is used to upload the obtained discharge location results to the remote cable operation status management system for early warning.

5. The early warning device for discharge defects in power distribution cables according to claim 4, characterized in that, The signal acquisition device (1) includes an ultra-high frequency sensor and an ultra-high frequency signal acquisition unit; Ultra-high frequency sensors are used to receive ultra-high frequency electromagnetic waves generated by the power supply. The UHF signal acquisition unit is used to sample and record the traveling wave signal received by the UHF sensor to obtain the waveform data of the signal.

6. The early warning device for discharge defects in power distribution cables according to claim 5, characterized in that, The frequency range of the UHF signal acquisition device is 30MHz-800MHz; the UHF signal acquisition device is equipped with GPS synchronization time function.

7. The early warning device for discharge defects in power distribution cables according to claim 4, characterized in that, The early warning device also includes a cable operation status management system. The cable operation status control system is used to issue early warnings based on discharge detection signals. When a discharge is detected, it indicates a Level 1 warning; when a discharge is detected, the amplitude of the discharge signal gradually increases after continuous monitoring, indicating a Level 2 warning. A Level 3 warning is indicated when the amplitude of the continuously monitored discharge signal increases and the number of discharges increases within the same time interval.

8. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method for early warning of discharge defects in power distribution cables according to any one of claims 1-3.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method for early warning of discharge defects in power distribution cables as described in any one of claims 1-3.

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