A system and method for live diagnosis and location of partial discharge defects in power distribution cables

Abstract

The present invention belongs to the technical field of electric power equipment. A system and method for live diagnosis and positioning of partial discharge defects in distribution cables is provided, including a high-performance computer, a host, a high-frequency clamp current sensor, a coupling capacitor sensor, and a phase detector; one end of the host is respectively connected to the high-frequency clamp current sensor, the coupling capacitor sensor, and the phase detector, and the other end of the host is connected to the high-performance computer; the high-performance computer stores high-precision map data of the area where the cable to be tested is located, and the high-performance computer determines the detection method information of live diagnosis of partial discharge defects in distribution cables based on real-time positioning information and high-precision map data, and controls the host to switch to electrical connection with any one of the high-frequency clamp current sensor, the coupling capacitor sensor, and the phase detector according to the detection method information. The present invention determines the best live diagnosis and positioning method of partial discharge defects in distribution cables based on the environmental information of the area where the cable to be tested is located, which can effectively improve the detection accuracy and efficiency of partial discharge defects.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a system and method for diagnosing and locating partial discharge defects in distribution cables. Background Art

[0002] Cable partial discharge (PD) refers to the discharge phenomenon occurring in local areas inside or on the surface of cable insulation. Cables are prone to partial discharge failures when they are installed, damaged by external forces, when the insulation is damp, or when the insulation is aged and deteriorated.

[0003] Due to the variability of cable laying environments and the application of various cables and new materials for their accessories in cable lines, it is increasingly difficult to find fault points on site. At the same time, power failure detection will cause great economic losses, and live detection of cable partial discharge has gradually become the mainstream technical development trend. Therefore, there is an urgent need for a system for live diagnosis and positioning of partial discharge defects that can adapt to a variety of distribution cable laying environments. Summary of the invention

[0004] In this regard, the present invention provides a system and method for diagnosing and locating partial discharge defects in distribution cables, an electronic device, a computer storage medium and a computer program product to solve at least one of the above-mentioned technical problems.

[0005] The present invention provides a system and method for diagnosing and locating partial discharge defects in power distribution cables. The system comprises a high-performance computer, a host, a high-frequency clamp current sensor, a coupling capacitance sensor, and a phase detector; one end of the host is respectively connected to the high-frequency clamp current sensor, the coupling capacitance sensor, and the phase detector, and the other end of the host is connected to the high-performance computer;

[0006] The high-performance computer stores high-precision map data of the area where the cable to be tested is located. The high-performance computer determines the detection method information of the live diagnosis of partial discharge defects in the distribution cable based on the real-time positioning information and the high-precision map data, and controls the host to switch to electrical connection with any one of the high-frequency clamp current sensor, the coupling capacitor sensor, and the core phase sensor based on the detection method information.

[0007] Optionally, the high-performance computer determines detection method information for live diagnosis of partial discharge defects in distribution cables according to the real-time positioning information and the high-precision map data, including:

[0008] The high-performance computer matches the high-precision map data with the corresponding mapping position according to the real-time positioning information, and retrieves the terminal cable grounding cabinet information associated with the mapping position and the information related to the access difficulty of the distribution cable from the high-precision map data;

[0009] The detection method information for live diagnosis of partial discharge defects in distribution cables is determined based on the terminal cable grounding cabinet information and information related to the difficulty of accessing the distribution cables.

[0010] Optionally, the determining, based on the terminal cable grounding cabinet information and information related to the accessibility difficulty of the distribution cable, the detection method information for live diagnosis of partial discharge defects in the distribution cable includes:

[0011] The map position of the terminal cable grounding cabinet is obtained by parsing the terminal cable grounding cabinet information, and a first distance between the map position and the mapping position is calculated. If the first distance is less than a distance threshold, it is determined that the detection method information for live diagnosis of partial discharge defects in distribution cables corresponds to the high-frequency clamp current sensor or the phase detector; otherwise:

[0012] A reach difficulty value is predicted based on information related to the reach difficulty of the distribution cable. If the reach difficulty value is lower than a difficulty threshold, it is determined that the detection method information for live diagnosis of partial discharge defects in the distribution cable corresponds to the coupling capacitance sensor.

[0013] Optionally, the detection method information for determining the live diagnosis of partial discharge defects in the distribution cable corresponds to the high-frequency clamp current sensor or the phase detector, and includes:

[0014] Further parsing the terminal cable grounding cabinet information to obtain cabinet door opening status information;

[0015] If the open state information indicates that the cabinet door cannot be opened, it is determined that the detection method information for live diagnosis of partial discharge defects in the power distribution cable corresponds to the high-frequency clamp current sensor;

[0016] If the open state information indicates that the cabinet door can be opened, it is determined that the detection method information for live diagnosis of partial discharge defects in the distribution cable corresponds to the phase detector.

[0017] Optionally, the predicting of the access difficulty value according to the information related to the access difficulty of the distribution cable includes:

[0018] Analyzing the information related to the difficulty of accessing the distribution cable to obtain the laying mode and the laying environment information corresponding to the laying mode; wherein the laying mode includes a suspended type, a pipeline type, and a pre-buried type;

[0019] The layout method and the corresponding layout environment information are input into a reach difficulty prediction model, and the reach difficulty prediction model outputs the predicted reach difficulty value.

[0020] Optionally, if the cabinet door opening state information is not obtained by parsing the terminal cable grounding cabinet information, then:

[0021] The high-performance computer obtains the historical records of live detection of distribution cables by all inspectors from the designated cloud server;

[0022] A first number of times the authority corresponding to the terminal cable grounding cabinet is obtained is calculated based on the historical records, and the detection mode information is determined to be a second number corresponding to the phase detector;

[0023] The opening probability of the cabinet door of the terminal cable grounding cabinet is calculated according to the first number and the second number. When the opening probability is higher than the opening threshold, it is determined that the cabinet door can be opened, otherwise it is determined that the cabinet door cannot be opened.

[0024] Optionally, the opening probability=second number / first number.

[0025] The present invention also provides an electronic device, applied to any of the high-performance computers mentioned above; the electronic device includes: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor.

[0026] The present invention also provides a computer storage medium, which is applied to any of the high-performance computers mentioned above; the computer storage medium stores a computer program that can be executed by a processor.

[0027] The present invention also provides a computer program product, which is applied to any of the high-performance computers mentioned above; the computer program product includes a computer program that can be executed by a processor.

[0028] The beneficial effect of the present invention is that the scheme of the present invention determines the best live diagnosis and positioning method for partial discharge defects in distribution cables by analyzing the environmental information of the area where the cable to be tested is located from high-precision map data, which can effectively improve the detection accuracy and efficiency of partial discharge defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of a live diagnosis and positioning system for partial discharge defects in distribution cables disclosed in an embodiment of the present invention;

[0031] Figure 2It is a schematic diagram of the principle of partial discharge detection based on a high-frequency clamp current sensor disclosed in an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of a high frequency sensor and a Rogowski coil;

[0033] Figure 4 It is a schematic diagram of the principle of partial discharge detection based on a coupling capacitance sensor disclosed in an embodiment of the present invention;

[0034] Figure 5 It is a schematic diagram of the principle of partial discharge detection based on a phase detector disclosed in an embodiment of the present invention;

[0035] Figure 6 It is a second principle schematic diagram of partial discharge detection based on a phase detector disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following is a description of the implementation of the present application by specific specific embodiments. People familiar with the technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0037] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 As shown, an embodiment of the present invention discloses a live diagnosis and positioning system for partial discharge defects in distribution cables, the system comprising a high-performance computer, a host, a high-frequency clamp current sensor (CT), a coupling capacitance sensor, and a phase detector; one end of the host is respectively connected to the high-frequency clamp current sensor, the coupling capacitance sensor, and the phase detector, and the other end of the host is connected to the high-performance computer;

[0039] The high-performance computer stores high-precision map data of the area where the cable to be tested is located. The high-performance computer determines the detection method information of the live diagnosis of partial discharge defects in the distribution cable based on the real-time positioning information and the high-precision map data, and controls the host to switch to electrical connection with any one of the high-frequency clamp current sensor, the coupling capacitor sensor, and the core phase sensor based on the detection method information.

[0040] The live diagnosis and positioning system for partial discharge defects in distribution cables of the present invention mainly includes the above-mentioned functional components, including a solution for on-site detection of insulation defects in distribution cables under live conditions corresponding to high-frequency clamp current sensors, coupling capacitor sensors, and phase detectors, so that the system of the present invention has stronger adaptability. At the same time, the high-performance computer of the present invention also stores high-precision map data containing the area where the cable to be tested is located. The high-performance computer can obtain real-time positioning information based on its own high-precision positioning system. The real-time positioning information can be mapped and matched with the high-precision map data to determine the area where the inspection personnel and equipment are currently located, and the relevant environmental information in the area can be directly retrieved from the high-precision map data. Therefore, the best live detection method to be used can be decided based on the relevant environmental information obtained. It can be seen that the solution of the present invention determines the best live diagnosis and positioning method for partial discharge defects in distribution cables by analyzing the environmental information of the area where the cable to be tested is located from the high-precision map data, which can effectively improve the detection accuracy and efficiency of partial discharge defects.

[0041] When the scheme of the present invention is implemented, the inspector carries the system of the present invention to the area where the cable to be tested is located. The inspector clicks the "Start" button in the high-performance computer. The high-performance computer obtains real-time positioning information and maps it to the high-precision map data, thereby retrieving the relevant environmental information of the area where the cable to be tested is located from the high-precision map data. The high-performance computer then determines the detection method information of the live diagnosis of the partial discharge defect of the distribution cable. The high-performance computer sends a control instruction to the host, and the host connects the detection device corresponding to the above detection method information (the prompt information of the detection method can be output on the high-performance computer and the host at the same time), that is, any one of the high-frequency clamp current sensor, coupling capacitance sensor, and nuclear phase detector. The inspector connects the corresponding detector to the distribution cable. The high-performance computer receives and judges whether the distribution cable has a partial discharge defect based on the detection signal fed back by the host, and further locates the partial discharge position when it is determined that the distribution cable has a partial discharge defect. This information can be output on the display screen of the high-performance computer.

[0042] The detection principles corresponding to each detection method refer to Figure 2-Figure 6 As shown:

[0043] 1) The principle of partial discharge detection based on high-frequency clamp current sensor (CT) is:

[0044] High-frequency sensor structure: High-frequency sensors are generally composed of CT current transformers and corresponding interfaces. When used, they are directly embedded in the grounding lead of the device under test. Rogowski coils are the core components of high-frequency sensors. They can couple the high-frequency magnetic field induced by the pulse current generated in the grounding wire due to partial discharge and convert the high-frequency magnetic field into a voltage signal. Figure 3 shown.

[0045] The structure of the Rogowski coil high frequency sensor is a ring with an opening. The wire end passes through the inside of the solenoid and then wraps back, which can make the two ends of the wire closely connected electrically, so that the whole coil can be flexibly opened and closed, and can be made into a clamp-shaped sleeve on the conductor or removed from the conductor without affecting the normal operation of the conductor.

[0046] High-frequency sensor sampling principle: The principle of partial discharge detection of high-frequency sensors is that when partial discharge occurs, a very steep pulse current will be generated during the discharge process. When it flows through the grounding lead, a magnetic field will be generated. This magnetic field is located on a plane perpendicular to the direction of current propagation. At this time, the high-frequency current sensor and the phase information sensor are installed on the grounding wire of the power equipment. Energy can be coupled from the magnetic field generated by the partial discharge and converted into an electrical signal by a coil, thereby detecting partial discharge faults in the power equipment.

[0047] 2) The principle of partial discharge detection based on coupling capacitance sensor is:

[0048] Sensor sampling principle: The U-shaped coupling capacitive sensor principle is based on the technology of capacitance change detection, which can be used for non-contact measurement and control applications. When the U-shaped coupling capacitive sensor is close to the object being detected, the capacitance value of the sensor will change, thereby changing the output signal of the sensor.

[0049] Working principle of the sensor: The working principle of the U-shaped coupling capacitive sensor is based on the principle of capacitive sensor. When the U-shaped coupling capacitive sensor is close to the detected cable, the detected cable acts as part of another capacitor, resulting in an increase in the internal capacitance of the U-shaped coupling capacitive sensor. When there is a partial discharge fault in the middle joint of the cable, a unique signal will be generated accordingly. This signal will couple a specific capacitance change through the U-shaped coupling capacitive sensor. The circuit measuring the voltage will sense the capacitance change and convert it into a digital signal. These digital signals are finally transmitted to the host for the next step of calculation and analysis, thereby achieving partial discharge detection of the middle joint of the cable.

[0050] 3)Reference Figure 6 As shown in the figure, the principle of partial discharge detection based on nuclear phase sensor is:

[0051] The phase sensor extracts the detection signal by connecting to the phase hole on the distribution network ring main unit or other equipment with a live display. When the cable discharges inside, the phase sensor will detect the corresponding pulse current. The pulse current will generate an instantaneous voltage change (pulse voltage) at both ends of the detection impedance through the coupling capacitor. After being processed by the OLPD (cable) cable partial discharge locator, the basic characteristic parameters and spectrum of partial discharge are obtained to realize the detection of partial discharge inside the cable.

[0052] Optionally, the high-performance computer determines detection method information for live diagnosis of partial discharge defects in distribution cables according to the real-time positioning information and the high-precision map data, including:

[0053] The high-performance computer matches the high-precision map data with the corresponding mapping position according to the real-time positioning information, and retrieves the terminal cable grounding cabinet information associated with the mapping position and the information related to the access difficulty of the distribution cable from the high-precision map data;

[0054] The detection method information for live diagnosis of partial discharge defects in distribution cables is determined based on the terminal cable grounding cabinet information and information related to the difficulty of accessing the distribution cables.

[0055] In this embodiment, the high-precision map data at least includes the terminal cable grounding cabinet information associated with the mapping location and the information related to the access difficulty of the distribution cable. Figure 2 , 4 , the A-end cable grounding cabinet and the B-end cable grounding cabinet in 5; the information related to the difficulty of accessing the distribution cables mainly includes the cable laying methods, pipeline laying, suspended laying, embedded laying, etc., as well as the laying height, depth, embedded material type and other information corresponding to each laying.

[0056] Among them, the mapping position is the corresponding position in the high-precision map obtained by a high-performance computer mapping the aforementioned real-time positioning information into the high-precision map data, and the specific mapping method will not be repeated here.

[0057] Optionally, the determining, based on the terminal cable grounding cabinet information and information related to the accessibility difficulty of the distribution cable, the detection method information for live diagnosis of partial discharge defects in the distribution cable includes:

[0058] The map position of the terminal cable grounding cabinet is obtained by parsing the terminal cable grounding cabinet information, and a first distance between the map position and the mapping position is calculated. If the first distance is less than a distance threshold, it is determined that the detection method information for live diagnosis of partial discharge defects in distribution cables corresponds to the high-frequency clamp current sensor or the phase detector; otherwise:

[0059] A reach difficulty value is predicted based on information related to the reach difficulty of the distribution cable. If the reach difficulty value is lower than a difficulty threshold, it is determined that the detection method information for live diagnosis of partial discharge defects in the distribution cable corresponds to the coupling capacitance sensor.

[0060] In this embodiment, in the detection method of the present invention, the high-frequency clamp current sensor needs to be installed on the grounding wire of the terminal cable grounding cabinet, and the phase detector needs to be directly connected to the corresponding interface of the terminal cable grounding cabinet. Therefore, the present invention is set to first calculate the distance between the two, that is, the first distance, based on the current position (i.e., the mapping position) and the position of the terminal cable grounding cabinet retrieved from the high-precision map data. If the first distance is less than the distance threshold, it means that the terminal cable grounding cabinet is within a suitable distance range from the current position, such as 200m. The detection personnel can reach the area where the terminal cable grounding cabinet is located without consuming too much energy, and then use the high-frequency clamp current sensor or the phase detector to perform live diagnosis and positioning of partial discharge defects on the distribution cable, otherwise choose to use the coupling capacitance sensor for detection.

[0061] At the same time, since the coupling capacitance sensor needs to be hung on the distribution cable to be tested when using the coupling capacitance sensor for detection, it is obvious that the environmental conditions of the cable laying may affect the detection method. For example, the distribution cable is laid at a high height, laid in underground pipelines that are difficult to operate, and buried in the soil (especially in geological structures of concrete or gravel structures). In this regard, the present invention predicts the access difficulty value corresponding to the laying environment of the area based on information related to the access difficulty of the distribution cable, that is, the difficulty for the detection personnel to hang the coupling capacitance sensor on the distribution cable. Only when the difficulty value is lower than the difficulty threshold can live detection based on the coupling capacitance sensor be performed.

[0062] In addition, it is also possible to first determine whether the access difficulty value is lower than the difficulty threshold. When the access difficulty value is lower than the difficulty threshold, it is determined that the detection method information of the live diagnosis of partial discharge defects in the distribution cable corresponds to the coupling capacitance sensor; when the access difficulty value is not lower than the difficulty threshold, the first distance is calculated and whether the first distance is less than the distance threshold. If so, it is further determined in a subsequent manner that the detection method information of the live diagnosis of partial discharge defects in the distribution cable corresponds to the high-frequency clamp current sensor or the phase detector.

[0063] Optionally, the detection method information for determining the live diagnosis of partial discharge defects in the distribution cable corresponds to the high-frequency clamp current sensor or the phase detector, and includes:

[0064] Further parsing the terminal cable grounding cabinet information to obtain cabinet door opening status information;

[0065] If the open state information indicates that the cabinet door cannot be opened, it is determined that the detection method information for live diagnosis of partial discharge defects in the power distribution cable corresponds to the high-frequency clamp current sensor;

[0066] If the open state information indicates that the cabinet door can be opened, it is determined that the detection method information for live diagnosis of partial discharge defects in the distribution cable corresponds to the phase detector.

[0067] In this embodiment, in general, the cable management department is responsible for managing the door opening authority of the terminal cable grounding cabinet, while the inspection personnel may not have the opening authority, or only have the door opening authority of some terminal cable grounding cabinets. If the cabinet door cannot be opened, the phase detector cannot be connected to the corresponding interface inside the cabinet door, but the grounding wire is generally located outside the cabinet, and the high-frequency clamp current sensor can be directly connected to it.

[0068] In view of the above actual situation, the present invention further retrieves the open status information of the cabinet door of the terminal cable grounding cabinet from the high-precision map data. The open status information represents whether the inspector has the authority to open it. Specifically, after the inspector receives the corresponding inspection task, the platform sends a permission acquisition request to the cable management department. The cable management department provides a temporary permission with a certain validity period to the corresponding inspector, and the permission provision information can be temporarily stored in the high-precision map data, and the high-performance computer can obtain the permission provision information, and then obtain the open status information of the cabinet door. In addition, the open status information of the cabinet door can also be represented by the lock fault information of the cabinet door. When the lock of the cabinet door fails, the open status information of the cabinet door is determined to be not open. The lock fault information is also stored in the high-precision map data. It can be that the cable management department staff finds the fault during the inspection and uploads it to the high-precision map data, or the lock automatically uploads the fault information to the high-precision map data through the Internet of Things technology. Furthermore, when the high-performance computer analyzes the open state information and finds that the cabinet door cannot be opened, it is determined to perform live detection through a high-frequency clamp current sensor, otherwise it is determined to perform detection through a phase detector.

[0069] Optionally, the predicting of the access difficulty value according to the information related to the access difficulty of the distribution cable includes:

[0070] Analyzing the information related to the difficulty of accessing the distribution cable to obtain the laying mode and the laying environment information corresponding to the laying mode; wherein the laying mode includes a suspended type, a pipeline type, and a pre-buried type;

[0071] The layout method and the corresponding layout environment information are input into a reach difficulty prediction model, and the reach difficulty prediction model outputs the predicted reach difficulty value.

[0072] In this embodiment, since the laying environment of the distribution cable is very complex, especially the pre-buried type, it is difficult to calculate the access difficulty value by preset rules. With the rapid development of large language models, the present invention preferably uses large language models to construct a access difficulty prediction model, and uses the access difficulty prediction model to fuse the laying method of the distribution cable and the laying environment information corresponding to the laying method, so as to predict the access difficulty value of the inspection personnel corresponding to the distribution cable laying environment.

[0073] The present invention first collects labeled training data suitable for the above prediction task, and uses the training data to train the large language model to achieve fine-tuning, thereby obtaining the above touch difficulty prediction model, and the touch difficulty prediction model can adapt to the above specific prediction task. The large language model can be a Transformer model, a BERT model (including variants such as RoBERTa, ALBERT), an NLG model, etc., which is not limited by the present invention.

[0074] An example is as follows: If the layout method is suspended, the access difficulty value can be predicted based on the suspension height. The higher the suspension height, the greater the corresponding access difficulty value, and vice versa. If the layout method is pipeline, the access difficulty value is determined based on factors such as the pipeline layout depth and the inspection port size. Obviously, the greater the layout depth and the smaller the inspection port, the greater the access difficulty value, and vice versa. If the layout method is pre-buried, the access difficulty value is mainly determined based on the hardness of the pre-buried soil. Obviously, the greater the hardness of the pre-buried soil, the more difficult it is for the inspection personnel to dig to hang the coupling capacitive sensor on the cable, and the corresponding access difficulty value is greater, and vice versa. The hardness of the pre-buried soil is determined by a pre-established soil hardness comparison table. The pre-buried soil includes conventional soil, gravel soil, concrete, etc., and the corresponding hardness increases in turn. The above information is all pre-stored in the high-precision map data.

[0075] Optionally, if the cabinet door opening state information is not obtained by parsing the terminal cable grounding cabinet information, then:

[0076] The high-performance computer obtains the historical records of live detection of distribution cables by all inspectors from the designated cloud server;

[0077] A first number of times the authority corresponding to the terminal cable grounding cabinet is obtained is calculated based on the historical records, and the detection mode information is determined to be a second number corresponding to the phase detector;

[0078] The opening probability of the cabinet door of the terminal cable grounding cabinet is calculated according to the first number and the second number. When the opening probability is higher than the opening threshold, it is determined that the cabinet door can be opened, otherwise it is determined that the cabinet door cannot be opened.

[0079] In this embodiment, the high-precision map data may not directly include the open status information of the cabinet door of the terminal cable grounding cabinet. In this case, the present invention retrieves the historical records of live detection of distribution cables by all detection personnel from the designated cloud server corresponding to the detection agency. From the historical records, the first number of times the authority corresponding to the terminal cable grounding cabinet is obtained and the second number of times the live detection method is determined to correspond to the phase detector can be extracted. The open probability of the cabinet door of the terminal cable grounding cabinet is calculated based on the first number and the second number.

[0080] Among them, the inspector will choose to conduct live detection through the phase checker according to the actual situation. At this time, it is necessary to send a request for obtaining the door opening authority to the cable management department. The cable management department may agree to authorize or refuse authorization according to its own actual situation, so as to obtain the first number of authority acquisitions corresponding to the terminal cable grounding cabinet. The second number of times that the detection method information is determined to correspond to the phase checker is directly stored in the historical record.

[0081] Optionally, the opening probability=second number / first number.

[0082] In this embodiment, the present invention sets the opening probability as the ratio of the door opening authority acquisition request initiated by the inspection personnel to be approved by the cable management department.

[0083] The present invention also discloses an electronic device, which is applied to any of the high-performance computers mentioned above; the electronic device includes: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor.

[0084] The present invention also discloses a computer storage medium, which is applied to any of the high-performance computers mentioned above; the computer storage medium stores a computer program that can be executed by a processor.

[0085] The present invention also discloses a computer program product, which is applied to any of the high-performance computers mentioned above; the computer program product includes a computer program that can be executed by a processor.

[0086] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0087] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A live diagnosis and positioning system for partial discharge defects in distribution cables, characterized by: The system comprises a high-performance computer, a host, a high-frequency clamp current sensor, a coupling capacitance sensor, and a phase detector; one end of the host is respectively connected to the high-frequency clamp current sensor, the coupling capacitance sensor, and the phase detector, and the other end of the host is connected to the high-performance computer; The high-performance computer stores high-precision map data of the area where the cable to be tested is located. The high-performance computer determines detection method information for live diagnosis of partial discharge defects in distribution cables based on real-time positioning information and the high-precision map data, and controls the host to switch to electrical connection with any one of the high-frequency clamp current sensor, the coupling capacitor sensor, and the phase detector according to the detection method information; The high-performance computer determines detection method information for live diagnosis of partial discharge defects in distribution cables based on the real-time positioning information and the high-precision map data, including: The high-performance computer matches the high-precision map data with the corresponding mapping position according to the real-time positioning information, and retrieves the terminal cable grounding cabinet information associated with the mapping position and the information related to the access difficulty of the distribution cable from the high-precision map data; The detection method information for live diagnosis of partial discharge defects in distribution cables is determined based on the terminal cable grounding cabinet information and information related to the difficulty of accessing the distribution cables.

2. A distribution cable partial discharge defect live diagnosis and positioning system according to claim 1, characterized in that: According to the terminal cable grounding cabinet information and the information related to the accessibility of the distribution cable, the detection method information for live diagnosis of partial discharge defects in the distribution cable is determined, including: The map position of the terminal cable grounding cabinet is obtained by parsing the terminal cable grounding cabinet information, and a first distance between the map position and the mapping position is calculated. If the first distance is less than a distance threshold, it is determined that the detection method information for live diagnosis of partial discharge defects in distribution cables corresponds to the high-frequency clamp current sensor or the phase detector; otherwise: A reach difficulty value is predicted based on information related to the reach difficulty of the distribution cable. If the reach difficulty value is lower than a difficulty threshold, it is determined that the detection method information for live diagnosis of partial discharge defects in the distribution cable corresponds to the coupling capacitance sensor.

3. A distribution cable partial discharge defect live diagnosis and positioning system according to claim 2, characterized in that: Determining that the detection mode information for live diagnosis of partial discharge defects in distribution cables corresponds to the high-frequency clamp current sensor or the phase detector includes: Further parsing the terminal cable grounding cabinet information to obtain cabinet door opening status information; If the open state information indicates that the cabinet door cannot be opened, it is determined that the detection method information for live diagnosis of partial discharge defects in the power distribution cable corresponds to the high-frequency clamp current sensor; If the open state information indicates that the cabinet door can be opened, it is determined that the detection method information for live diagnosis of partial discharge defects in the distribution cable corresponds to the phase detector.

4. A distribution cable partial discharge defect live diagnosis and positioning system according to claim 3, characterized in that: The accessibility value is predicted based on information related to the accessibility of the distribution cables, including: Analyzing the information related to the difficulty of accessing the distribution cable to obtain the laying mode and the laying environment information corresponding to the laying mode; wherein the laying mode includes a suspended type, a pipeline type, and a pre-buried type; The layout method and the corresponding layout environment information are input into a reach difficulty prediction model, and the reach difficulty prediction model outputs the predicted reach difficulty value.

5. A distribution cable partial discharge defect live diagnosis and positioning system according to claim 3, characterized in that: If the cabinet door opening status information is not obtained from the terminal cable grounding cabinet information, then: The high-performance computer obtains the historical records of live detection of distribution cables by all inspectors from the designated cloud server; A first number of times the authority corresponding to the terminal cable grounding cabinet is obtained is calculated based on the historical records, and the detection mode information is determined to be a second number corresponding to the phase detector; The opening probability of the cabinet door of the terminal cable grounding cabinet is calculated according to the first number and the second number. When the opening probability is higher than the opening threshold, it is determined that the cabinet door can be opened, otherwise it is determined that the cabinet door cannot be opened.

6. A distribution cable partial discharge defect live diagnosis and positioning system according to claim 5, characterized in that: The opening probability=second number / first number.

7. An electronic device, characterized in that: The high-performance computer applied to any one of claims 1-6; the electronic device comprises: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor.

8. A computer storage medium, characterized in that: The high-performance computer applied to any one of claims 1 to 6; the computer storage medium stores a computer program executable by a processor.

9. A computer program product, characterized in that: The high performance computer as claimed in any one of claims 1 to 6; the computer program product comprises a computer program executable by a processor.

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