A cable fault sniffing method based on GIS positioning technology

Abstract

The present invention relates to the technical field of cable fault location, and in particular to a cable fault sniffing method based on GIS positioning technology, comprising: locating position information of each cable section according to a GPS positioning device, generating a cable distribution GIS map based on the position information of each cable section, uploading historical cable fault points and fault point fault information, and storing the uploaded historical cable fault points and fault point fault information; setting a crawler mechanism to be applied to a cable state parameter sensing device, so that the cable state parameter sensing device collects cable state parameters on cables included in the cable distribution GIS map in real time; obtaining cable state parameters collected by the cable state parameter sensing device based on the crawler mechanism, the present invention obtains the cable position through the GPS positioning device, thereby generating a cable distribution GIS map, further controlling the cable state parameter sensing device to collect cable operating parameters using the set crawler mechanism, and further analyzing cable fault problems based on the cable operating parameters.

Description

Technical Field

[0001] The present invention relates to the technical field of cable fault location, and in particular to a cable fault sniffing method based on GIS positioning technology. Background Art

[0002] A cable fault refers to an abnormal condition that occurs during cable operation. It may manifest as a short circuit, open circuit, or insulation damage. Causes vary, including mechanical damage, overloaded operation, and environmental corrosion. Cable faults can affect power transmission, leading to power outages and disrupting production and daily life.

[0003] The invention patent application number 201610850312.0 discloses a cable fault point location method, comprising the following steps: (1) setting a plurality of first monitoring nodes on a transmission line in a first non-equidistant manner; (2) setting at least one second monitoring node between every two adjacent first monitoring nodes in a second non-equidistant manner, wherein the spacing in the second non-equidistant manner is smaller than the spacing in the first non-equidistant manner; (3) transmitting a reference signal from one end to the other end of the transmission line; (4) transmitting a compensation signal between at least a portion of the second monitoring nodes based on the transmission result of the reference signal between the first monitoring nodes to compensate for harmonic signals and resistivity; (5) regularly removing the compensation signal of each second monitoring node that transmits the compensation signal, and monitoring whether the transmission result of the first monitoring node changes; (6) determining the location of the cable fault point based on whether the transmission result of the first monitoring node changes in a predetermined manner.

[0004] This application aims to solve the problem that "the above-mentioned transmission line fault point locating methods basically rely on multiple evenly distributed monitoring nodes. These nodes are not convenient to be deployed in some areas restricted by actual environmental conditions, and the monitoring information basically only relies on the monitoring information obtained from one link. Once one or some monitoring nodes in the link fail, it is difficult to repair them in a short time, resulting in the inability to stably monitor the line fault. In addition, the monitoring nodes on the line themselves are also taken into consideration in the monitoring algorithm in the prior art. Once a large number of monitoring nodes are replaced due to damage or other reasons, the parameters of the algorithm of the entire system need to be adjusted."

[0005] However, most current cable fault location technologies use fixed detection points to detect cable faults and further locate them. Due to the fixed detection points, the number of detection points deployed increases with cable length and complexity.

[0006] To this end, we provide a cable fault sniffing method based on GIS positioning technology. Summary of the Invention

[0007] In view of the above-mentioned shortcomings of the prior art, the present invention provides a cable fault sniffing method based on GIS positioning technology, which solves the technical problems raised in the above-mentioned background technology.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A cable fault sniffing method based on GIS positioning technology, comprising:

[0010] The position information of each cable section is located according to the GPS positioning device, a cable distribution GIS map is generated based on the position information of each cable section, the historical cable fault points and fault point fault information are uploaded, and the uploaded historical cable fault points and fault point fault information are stored; a crawler mechanism is set to be applied to the cable status parameter sensing device, so that the cable status parameter sensing device collects the cable status parameters on the cables included in the cable distribution GIS map in real time; the cable status parameters collected by the cable status parameter sensing device based on the crawler mechanism are obtained, and the cable fault risk is analyzed according to the cable status parameters; the cable fault risk analysis results are obtained, the cable fault judgment threshold is set, and the cable fault judgment threshold is compared with the cable fault risk analysis results of each group to determine the cable section with fault problems; the judgment result is output as the position information of the cable status parameter sensing device where the cable section with fault problems is located when the cable status parameters are collected, and the cable section with fault problems is determined based on the position information; the cable section with fault problems is determined according to the output position information.

[0011] Furthermore, when performing the positioning of the position information of each cable segment, the GPS positioning device performs a positioning operation at the end position of each cable segment, and only performs a positioning operation once at the connection end position of two groups of cable segments. When the cable fault point and the fault point fault information are stored, the cable fault point and the fault point fault information are bound to each other, and the storage operation is performed after marking the fault occurrence time;

[0012] Among them, the fault point fault information includes: fault point temperature, fault point voltage, fault point current, partial discharge, fault point inductance, and the uploaded cable historical fault points all fall on the cable distribution GIS map.

[0013] Furthermore, the cable status parameter sensing device is integrated with sensors capable of sensing cable temperature, cable voltage, cable current, cable partial discharge, and cable inductance;

[0014] The crawler mechanism is used to set the operating logic of the cable status parameter sensing device, and the crawler mechanism includes:

[0015] NO1. Set the number of cable status parameter sensing devices, pick up the cable distribution topology in the cable distribution GIS map, select the same number of starting positions in the cable distribution topology as the set number of cable status sensing devices, and deploy cable status parameter sensing devices at each starting position;

[0016] NO2. Obtain the cable segments in the cable distribution topology where the cable status parameter sensing device is deployed, and upload the obtained number of electricity users served by the corresponding cable segments and the distribution structure of the lower-level cable segments;

[0017] NO3. Set the moving distance of the cable status parameter sensing device before it starts to collect the cable status parameters based on the historical fault points and fault information of the cable; set the frequency of the cable status parameter sensing device when it starts to collect the cable status parameters based on the number of electricity users served by the cable segment where the cable status parameter sensing device is located and the distribution structure of the lower-level cable segments;

[0018] Among them, the cable status parameter sensing device always takes the cable segment where the starting point is located as the cable status parameter collection target. The cable status parameter sensing device operates according to the moving distance and the cable status parameter collection frequency, and continuously collects the cable status parameters.

[0019] Furthermore, the distribution structure of the lower-level cable segments of the cable segment, that is, the lower-level cable segments of the cable segment in the cable distribution topology, the sub-cable distribution topology composed of the lower-level cable segments;

[0020] During the cable status parameter collection stage when the cable status parameter sensing device moves on the cable segment where the starting point is located, a group of points equal to the moving distance are measured at the starting position according to the set moving distance, and the measured points are used as the positions at which the cable status parameter sensing device operates to collect the cable status parameters. When the cable status parameter sensing device is used again to operate to collect the cable status parameters, the last measured point is used as the starting position, and a group of points equal to the moving distance are measured, and the measured points are used as the positions at which the cable status parameter sensing device operates to collect the cable status parameters, and so on.

[0021] Among them, in the stage of determining the location for collecting cable status parameters, in the process of each measurement of a point equal to the moving distance, when reaching the end point of the cable segment, it turns back and accumulates the distance measurement and the point equal to the moving distance.

[0022] Furthermore, the moving distance of the cable status parameter sensing device before it starts collecting the cable status parameters is:

[0023]

[0024] Where: d is the distance traveled by the cable status parameter sensing device before it starts collecting cable status parameters; d0 is the base distance traveled; m is the number of failures in the target cable segment served by the cable status parameter sensing device; (U / I) min 、(U / I) max The minimum voltage-current ratio and the maximum voltage-current ratio in each fault of the target cable segment serving the cable status parameter sensing device; c max 、c min The highest and lowest cable temperatures during each fault in the target cable segment serving the cable status parameter sensing device; g i The partial discharge amount of the target cable segment when the i-th fault occurs in the target cable segment serving the cable status parameter sensing device; L i The inductance value of the target cable segment when the i-th fault occurs is the cable status parameter sensing device serving the target cable segment; L max 、L min The maximum and minimum inductance values of each fault in the target cable segment serving the cable status parameter sensing device;

[0025] in, Table pair The average, Table pair Seeking balance.

[0026] Furthermore, the frequency of the cable status parameter sensing device when operating to collect cable status parameters is:

[0027]

[0028] Where: n is the frequency of the cable status parameter sensing device collecting cable status parameters; n0 is the base number of the collection frequency; q is the number of electricity users served by the cable segment where the cable status parameter sensing device is located; y is the total number of nodes in the sub-cable distribution topology corresponding to the lower-level cable segment distribution structure; d x is the degree of the x-th node; is the average degree of the node; l is the total number of cable segments in the sub-cable distribution topology; γ is the normalization factor;

[0029] Among them, the normalization factor γ makes The value of is controlled within the range of (0, 1), and the frequency n of the cable status parameter sensing device when collecting cable status parameters is rounded up.

[0030] Furthermore, the acquisition frequency base n0 and the moving distance base d0 are manually set by the user end, and the acquisition frequency base n0 is not less than three, and the moving distance base d0 is not less than one third of the total length of the cable segment.

[0031] Furthermore, in the cable fault risk analysis stage, when obtaining cable status parameters, the obtained cable status parameters are derived from a cable status parameter sensing device configured on the same cable segment.

[0032] Furthermore, the cable fault determination logic is expressed as:

[0033]

[0034] Where: k1, k2, and k3 are the cable fault risk values k obtained by collecting the cable status parameters after the cable status parameter sensing device moves 1, 2, and 3 times respectively; K is the cable fault judgment threshold;

[0035] If any of the above equations holds true, it means that there is a fault in the cable. If none of the above equations holds true, it means that there is no fault in the cable. k1, k2, and k3 are the latest cable fault risk values obtained based on the time series.

[0036] Furthermore, the cable fault risk analysis result is expressed as a cable fault risk value, and the cable fault risk value is obtained by the following formula:

[0037]

[0038] Where: c j 、(U×I) j 、g j 、L j The cable temperature value, product of cable voltage and cable current, cable partial discharge, and cable inductance value collected by the j-th cable state parameter sensing device operation; ω1, ω2, ω3, and ω4 are weights;

[0039] Among them, the larger the cable fault risk value k is, the higher the cable fault risk is, and vice versa, the lower the cable fault risk is. The sum of the weights ω1, ω2, ω3, and ω4 is 1.

[0040] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0041] The present invention provides a cable fault sniffing method based on GIS positioning technology. During the execution of the method, the cable position is obtained through a GPS positioning device, thereby generating a cable distribution GIS map. The cable status parameter sensing device is further controlled by a set crawler mechanism to collect cable operating parameters, and the cable fault problem is further analyzed based on the cable operating parameters.

[0042] Moreover, due to the setting of the crawler mechanism and the deployment of cable status parameter sensing equipment, it has the randomness of cable fault detection points, comprehensive coverage of cable fault detection points and targeted power fault detection points that are not available in existing cable fault location technologies, effectively ensuring the effectiveness of cable fault detection sniffing results. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0044] Figure 1 The figure is a flowchart of a cable fault sniffing method based on GIS positioning technology. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] The present invention will be further described below with reference to the embodiments.

[0047] Example 1:

[0048] This embodiment is a cable fault sniffing method based on GIS positioning technology, such as Figure 1 As shown, the following steps are included:

[0049] Step 1: Locate the location information of each cable section using the GPS positioning device, generate a cable distribution GIS map based on the location information of each cable section, upload the historical cable fault points and fault point fault information, and store the uploaded historical cable fault points and fault point fault information;

[0050] When the GPS positioning device locates the location information of each cable segment, it performs a positioning operation at the end point of each cable segment. It only performs a positioning operation at the connection end point of two groups of cable segments. When the cable fault point and the fault point fault information are stored, the cable fault point and the fault point fault information are bound to each other and the storage operation is performed after marking the fault occurrence time.

[0051] Among them, the fault information of the fault point includes: fault point temperature, fault point voltage, fault point current, partial discharge, fault point inductance, and the uploaded cable historical fault points are all located on the cable distribution GIS map;

[0052] The cable status parameter sensing device is integrated with sensors that can sense cable temperature, cable voltage, cable current, cable partial discharge, and cable inductance;

[0053] The crawler mechanism is used to set the operating logic of the cable status parameter sensing device. The crawler mechanism includes:

[0054] NO1. Set the number of cable status parameter sensing devices, pick up the cable distribution topology in the cable distribution GIS map, select the same number of starting positions in the cable distribution topology as the set number of cable status sensing devices, and deploy cable status parameter sensing devices at each starting position;

[0055] NO2. Obtain the cable segments in the cable distribution topology where the cable status parameter sensing device is deployed, and upload the obtained number of electricity users served by the corresponding cable segments and the distribution structure of the lower-level cable segments;

[0056] NO3. Set the moving distance of the cable status parameter sensing device before it starts to collect the cable status parameters based on the historical fault points and fault information of the cable; set the frequency of the cable status parameter sensing device when it starts to collect the cable status parameters based on the number of electricity users served by the cable segment where the cable status parameter sensing device is located and the distribution structure of the lower-level cable segments;

[0057] Among them, the cable status parameter sensing device always takes the cable segment where the starting point is located as the cable status parameter collection target. The cable status parameter sensing device operates according to the moving distance and the cable status parameter collection frequency, and continuously collects the cable status parameters;

[0058] Step 2: Set the crawler mechanism to be applied to the cable status parameter sensing device, so that the cable status parameter sensing device collects the cable status parameters in real time on the cables included in the cable distribution GIS map;

[0059] Step 3: Obtain the cable status parameters collected by the cable status parameter sensing device based on the crawler mechanism, and analyze the cable fault risk based on the cable status parameters;

[0060] Step 4: Obtain the cable fault risk analysis results, set the cable fault determination threshold, compare the cable fault determination threshold with the cable fault risk analysis results of each group, and determine the cable segment with fault problems;

[0061] The cable fault determination logic is expressed as:

[0062]

[0063] Where: k1, k2, and k3 are the cable fault risk values k obtained by collecting the cable status parameters after the cable status parameter sensing device moves 1, 2, and 3 times respectively; K is the cable fault judgment threshold;

[0064] If any of the above equations holds true, it means that there is a fault in the cable. If none of the above equations holds true, it means that there is no fault in the cable. k1, k2, and k3 are the cable fault risk values ​​most recently calculated based on the time series.

[0065] The cable fault risk analysis results are expressed as a cable fault risk value, which is calculated using the following formula:

[0066]

[0067] Where: c j 、(U×I) j 、g j 、L j The cable temperature value, product of cable voltage and cable current, cable partial discharge, and cable inductance value collected by the j-th cable state parameter sensing device operation; ω1, ω2, ω3, and ω4 are weights;

[0068] Among them, the larger the cable fault risk value k is, the higher the cable fault risk is, and vice versa, the lower the cable fault risk is. The sum of the weights ω1, ω2, ω3, and ω4 is 1;

[0069] Step 5: The cable status parameter sensing device outputs the determination result as the location information of the cable segment where the faulty problem is located, and determines the cable segment where the faulty problem is located based on the location information when the cable status parameters are collected;

[0070] Step 6: Determine the cable segment with the fault problem based on the output location information.

[0071] In this embodiment, by executing the steps of the method in the above embodiment, a GIS map of cable distribution is constructed using GIS positioning technology, and the crawler mechanism and power status parameter perception equipment are further configured to analyze and determine the power operation risks, thereby bringing reliable maintenance effects to the daily operation of the cable.

[0072] Example 2:

[0073] In terms of specific implementation, based on the first embodiment, this embodiment refers to Figure 1 The cable fault sniffing method based on GIS positioning technology in Example 1 is further described in detail:

[0074] The distribution structure of the lower-level cable segments of the cable segment, that is, the sub-cable distribution topology composed of the lower-level cable segments of the cable segment in the cable distribution topology;

[0075] During the cable status parameter collection stage when the cable status parameter sensing device moves on the cable segment where the starting point is located, a group of points equal to the moving distance are measured at the starting position according to the set moving distance, and the measured points are used as the positions at which the cable status parameter sensing device operates to collect the cable status parameters. When the cable status parameter sensing device is used again to operate to collect the cable status parameters, the last measured point is used as the starting position, and a group of points equal to the moving distance are measured, and the measured points are used as the positions at which the cable status parameter sensing device operates to collect the cable status parameters, and so on.

[0076] Among them, in the stage of determining the location for collecting cable status parameters, in the process of each measurement of a point equal to the moving distance, when reaching the end point of the cable segment, turn back and accumulate the distance measurement and the point equal to the moving distance;

[0077] The moving distance of the cable status parameter sensing device before it starts collecting cable status parameters is:

[0078]

[0079] Where: d is the distance traveled by the cable status parameter sensing device before it starts collecting cable status parameters; d0 is the base distance traveled; m is the number of failures in the target cable segment served by the cable status parameter sensing device; (U / I) min 、(U / I) max The minimum voltage-current ratio and the maximum voltage-current ratio in each fault of the target cable segment serving the cable status parameter sensing device; c max 、c min The highest and lowest cable temperatures during each fault in the target cable segment serving the cable status parameter sensing device; g i The partial discharge amount of the target cable segment when the i-th fault occurs in the target cable segment serving the cable status parameter sensing device; L i The inductance value of the target cable segment when the i-th fault occurs is the cable status parameter sensing device serving the target cable segment; L max 、L min The maximum and minimum inductance values of each fault in the target cable segment serving the cable status parameter sensing device;

[0080] in, Table pair The average, Table pair of seeking average;

[0081] The frequency of cable status parameter sensing equipment collecting cable status parameters is:

[0082]

[0083] Where: n is the frequency of the cable status parameter sensing device collecting cable status parameters; n0 is the base number of the collection frequency; q is the number of electricity users served by the cable segment where the cable status parameter sensing device is located; y is the total number of nodes in the sub-cable distribution topology corresponding to the lower-level cable segment distribution structure; d x is the degree of the x-th node; is the average degree of the node; l is the total number of cable segments in the sub-cable distribution topology; γ is the normalization factor;

[0084] Among them, the normalization factor γ makes The value of is controlled within the range of (0, 1), and the frequency n of the cable status parameter sensing device when collecting cable status parameters is rounded up;

[0085] The collection frequency base n0 and the moving distance base d0 are manually set by the user end, and the collection frequency base n0 is not less than three, and the moving distance base d0 is not less than one third of the total length of the cable segment.

[0086] In this embodiment, through the above-mentioned settings, the moving distance of the cable status parameter sensing device before running to collect the cable status parameters, as well as the frequency of the cable status parameter sensing device when running to collect the cable status parameters are limited and the results are obtained, which provides necessary logical support for the execution of the method in Example 1, ensures the stable execution of the method in Example 1, and brings daily operation and maintenance services to the cable.

[0087] like Figure 1 As shown, in the cable fault risk analysis phase, when obtaining cable status parameters, the obtained cable status parameters are derived from the cable status parameter sensing device configured on the same cable segment.

[0088] In summary, during the execution of the method in the above embodiment, the cable position is obtained through the GPS positioning device, thereby generating a cable distribution GIS map, and further controlling the cable status parameter sensing device to collect cable operation parameters by the set crawler mechanism, and further analyzing the cable fault problem based on the cable operation parameters. Moreover, due to the setting of the crawler mechanism and the deployment of the cable status parameter sensing device, it has the randomness of cable fault detection points, the comprehensive coverage of cable fault detection points and the targeted power fault detection points that the existing cable fault location technology does not have, which effectively ensures the effectiveness of the cable fault detection sniffing results.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A cable fault sniffing method based on GIS positioning technology, characterized in that: The following steps are involved: Step 1: Locate the location information of each cable section using the GPS positioning device, generate a cable distribution GIS map based on the location information of each cable section, upload the historical cable fault points and fault point fault information, and store the uploaded historical cable fault points and fault point fault information; Step 2: Set the crawler mechanism to be applied to the cable status parameter sensing device, so that the cable status parameter sensing device collects the cable status parameters in real time on the cables included in the cable distribution GIS map; Step 3: Obtain the cable status parameters collected by the cable status parameter sensing device based on the crawler mechanism, and analyze the cable fault risk based on the cable status parameters; Step 4: Obtain the cable fault risk analysis results, set the cable fault determination threshold, compare the cable fault determination threshold with the cable fault risk analysis results of each group, and determine the cable segment with fault problems; Step 5: The cable status parameter sensing device outputs the determination result as the location information of the cable segment where the faulty problem is located, and determines the cable segment where the faulty problem is located based on the location information when the cable status parameters are collected; Step 6: Determine the cable segment with the fault problem based on the output location information; The cable fault determination logic is expressed as: Where: k1, k2, and k3 are the cable fault risk values k obtained by collecting the cable status parameters after the cable status parameter sensing device moves 1, 2, and 3 times respectively; K is the cable fault judgment threshold; If any of the above equations holds true, it means that there is a fault in the cable. If none of the above equations holds true, it means that there is no fault in the cable. k1, k2, and k3 are the cable fault risk values ​​most recently calculated based on the time series. The cable fault risk analysis result is expressed as a cable fault risk value, which is obtained by the following formula: Where: c j 、(U×I) j 、g j 、L j The cable temperature value, product of cable voltage and cable current, cable partial discharge, and cable inductance value collected by the j-th cable state parameter sensing device operation; ω1, ω2, ω3, and ω4 are weights; Among them, the larger the cable fault risk value k is, the higher the cable fault risk is, and vice versa, the lower the cable fault risk is. The sum of the weights ω1, ω2, ω3, and ω4 is 1.

2. A cable fault sniffing method based on GIS positioning technology according to claim 1, characterized in that: When the GPS positioning device locates the position information of each cable segment, it performs a positioning operation at the end point of each cable segment. It only performs a positioning operation at the connection end point of two groups of cable segments. When the cable fault point and the fault point fault information are stored, the cable fault point and the fault point fault information are bound to each other, and the storage operation is performed after marking the fault occurrence time. Among them, the fault point fault information includes: fault point temperature, fault point voltage, fault point current, partial discharge, fault point inductance, and the uploaded cable historical fault points all fall on the cable distribution GIS map.

3. The cable fault sniffing method based on GIS positioning technology according to claim 1 is characterized in that: The cable status parameter sensing device is integrated with sensors capable of sensing cable temperature, cable voltage, cable current, cable partial discharge, and cable inductance; The crawler mechanism is used to set the operating logic of the cable status parameter sensing device, and the crawler mechanism includes: NO1. Set the number of cable status parameter sensing devices, pick up the cable distribution topology in the cable distribution GIS map, select the same number of starting positions in the cable distribution topology as the set number of cable status sensing devices, and deploy cable status parameter sensing devices at each starting position; NO2. Obtain the cable segments in the cable distribution topology where the cable status parameter sensing device is deployed, and upload the obtained number of electricity users served by the corresponding cable segments and the distribution structure of the lower-level cable segments; NO3. Set the moving distance of the cable status parameter sensing device before it starts to collect the cable status parameters based on the historical fault points and fault information of the cable; set the frequency of the cable status parameter sensing device when it starts to collect the cable status parameters based on the number of electricity users served by the cable segment where the cable status parameter sensing device is located and the distribution structure of the lower-level cable segments; Among them, the cable status parameter sensing device always takes the cable segment where the starting point is located as the cable status parameter collection target. The cable status parameter sensing device operates according to the moving distance and the cable status parameter collection frequency, and continuously collects the cable status parameters.

4. The cable fault sniffing method based on GIS positioning technology according to claim 3 is characterized in that: The distribution structure of the lower-level cable segments of the cable segment, that is, the lower-level cable segments of the cable segment in the cable distribution topology, and the sub-cable distribution topology composed of the lower-level cable segments; During the cable status parameter collection stage when the cable status parameter sensing device moves on the cable segment where the starting point is located, a group of points equal to the moving distance are measured at the starting position according to the set moving distance, and the measured points are used as the positions at which the cable status parameter sensing device operates to collect the cable status parameters. When the cable status parameter sensing device is used again to operate to collect the cable status parameters, the last measured point is used as the starting position, and a group of points equal to the moving distance are measured, and the measured points are used as the positions at which the cable status parameter sensing device operates to collect the cable status parameters, and so on. Among them, in the stage of determining the location for collecting cable status parameters, in the process of each measurement of a point equal to the moving distance, when reaching the end point of the cable segment, it turns back and accumulates the distance measurement and the point equal to the moving distance.

5. The cable fault sniffing method based on GIS positioning technology according to claim 3 is characterized in that: The moving distance of the cable status parameter sensing device before it starts collecting cable status parameters is: Where: d is the moving distance before the cable status parameter sensing device starts to collect the cable status parameters; d0 is the moving distance base; m is the number of failures in the target cable segment served by the cable status parameter sensing device; (U / I) min 、(U / I) max The minimum voltage-current ratio and the maximum voltage-current ratio in each fault of the target cable segment serving the cable status parameter sensing device; c max 、c min The highest and lowest cable temperatures during each fault in the target cable segment serving the cable status parameter sensing device; g i The partial discharge amount of the target cable segment when the i-th fault occurs in the target cable segment serving the cable status parameter sensing device; L i The inductance value of the target cable segment when the i-th fault occurs is the cable status parameter sensing device serving the target cable segment; L max 、L min The maximum and minimum inductance values of each fault in the target cable segment serving the cable status parameter sensing device; in, Express The average, Express Seeking balance.

6. The cable fault sniffing method based on GIS positioning technology according to claim 5 is characterized in that: The frequency of the cable status parameter sensing device when running to collect cable status parameters is: Where: n is the frequency of the cable status parameter sensing device collecting cable status parameters; n0 is the base number of the collection frequency; q is the number of electricity users served by the cable segment where the cable status parameter sensing device is located; y is the total number of nodes in the sub-cable distribution topology corresponding to the lower-level cable segment distribution structure; d x is the degree of the x-th node; is the average degree of the node; l is the total number of cable segments in the sub-cable distribution topology; γ is the normalization factor; Among them, the normalization factor γ makes The value of is controlled within the range of (0, 1), and the frequency n of the cable status parameter sensing device when collecting cable status parameters is rounded up.

7. The cable fault sniffing method based on GIS positioning technology according to claim 6 is characterized in that: The acquisition frequency base n0 and the moving distance base d0 are manually set by the user end, and the acquisition frequency base n0 is not less than three, and the moving distance base d0 is not less than one third of the total length of the cable segment.

8. The cable fault sniffing method based on GIS positioning technology according to claim 1 is characterized in that: During the cable fault risk analysis phase, when obtaining cable status parameters, the obtained cable status parameters are derived from a cable status parameter sensing device configured on the same cable segment.

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