Cable outer sheath fault positioning device, method and equipment

Abstract

The invention discloses a cable outer sheath fault positioning device, method and equipment, and belongs to the technical field of electric power facilities. The device comprises a current applying module which is used for respectively applying a first constant current and a second constant current to a cable; the temperature rise performance acquisition module is used for acquiring a first temperature rise performance and a second temperature rise performance of each position of the cable under the action of the first constant current and the second constant current respectively; the temperature rise comparison characteristic determination module is used for determining a temperature rise comparison characteristic according to the first temperature rise performance and the second temperature rise performance; and the outer protective layer fault determination module is used for determining that the cable has an outer protective layer fault when the temperature rise comparison characteristic meets a preset condition, and determining the position of the outer protective layer fault according to the temperature rise comparison characteristic. According to the technical scheme, the damage problem of the outer sheath of the cable can be detected in time, the specific damage position of the outer sheath can be determined, rapid positioning of a fault point can be achieved, and the positioning efficiency of the fault point and the operation safety in the inspection process can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of electric power facilities, and specifically relates to a device, method and equipment for locating a cable outer sheath fault. Background Art

[0002] The outer sheath is the outermost protective structure of the cable, which enables the cable to withstand various mechanical stresses during the laying process and ensures the integrity and safety of the cable. However, risks such as falling objects in the cable trench may cause the outer sheath to fail.

[0003] At present, the identification of cable sheath faults is usually carried out through manual inspections, which not only takes a lot of time and manpower, but also fails to detect the cable sheath faults in a timely manner. Inspectors entering the cable trench may also face safety risks such as high concentrations of harmful gases and impacts from falling objects.

[0004] Therefore, how to identify and locate the outer sheath fault of the cable is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The embodiments of the present application provide a cable outer sheath fault location device, method and equipment, the purpose of which is to timely detect the outer sheath damage of the cable and determine the specific location of the outer sheath damage, which is conducive to the rapid location of the fault point without the need for staff to enter the cable trench, thereby improving the location efficiency of the fault point and the work safety during the inspection process.

[0006] In a first aspect, an embodiment of the present application provides a cable outer sheath fault location device, the device comprising:

[0007] A current applying module, used for respectively applying a first constant current and a second constant current to the cable to be tested;

[0008] A temperature rise performance acquisition module, used to acquire a first temperature rise performance of each position of the cable under the action of a first constant current, and a second temperature rise performance of each position of the cable under the action of a second constant current;

[0009] A temperature rise comparison characteristic determination module, used to determine the temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance;

[0010] The outer sheath fault determination module is used to determine that the cable has an outer sheath fault when the temperature rise comparison feature meets the preset conditions, and determine the outer sheath fault position according to the temperature rise comparison feature.

[0011] Furthermore, the temperature rise comparison feature determination module is specifically used to:

[0012] Draw the temperature rise curves of various positions of the cable under the action of the first constant current and the second constant current;

[0013] The temperature rise curves under the first constant current and the second constant current are compared according to the cable position, the temperature rise difference at each position of the cable under the two constant currents is calculated, and a temperature rise difference distribution diagram is drawn.

[0014] Furthermore, the outer sheath fault determination module is specifically used to:

[0015] Identify whether there is a local abnormal area in the temperature rise difference distribution map where the temperature rise difference is greater than a set threshold;

[0016] If so, it is determined that there is an outer sheath fault in the cable.

[0017] Furthermore, the outer sheath fault determination module is specifically used to:

[0018] When it is determined that there is an outer sheath fault in the cable, the temperature rise difference distribution diagram is analyzed, and the cable position corresponding to the local abnormal area is obtained to determine the outer sheath fault position.

[0019] Furthermore, the device also includes:

[0020] An environmental data acquisition module is used to collect environmental data of the cable laying location; wherein the environmental data includes environmental temperature, environmental humidity and environmental air pressure;

[0021] Correspondingly, the outer sheath fault determination module is also used for:

[0022] Acquiring the influence degree of the environmental data on the heat dissipation effect of the cable;

[0023] Determining, according to the degree of influence, a standard temperature rise comparison characteristic of the cable during normal operation;

[0024] The preset conditions under the current environmental data are determined according to the standard temperature rise comparison characteristics.

[0025] Furthermore, the device also includes:

[0026] A fault cause determination module, used to obtain environmental data of the outer sheath fault location when it is determined that the outer sheath fault exists in the cable;

[0027] The environmental data and the temperature rise comparison characteristics are input into a pre-built cause analysis model, and the cause of the outer sheath failure is determined according to an output result of the cause analysis model.

[0028] Furthermore, the device also includes:

[0029] The model building module is used to predict the possible fault causes of the outer sheath, obtain the environmental data corresponding to each fault cause and the temperature rise comparison characteristics as test samples, perform supervised training on the test samples, and obtain a cause analysis model.

[0030] In a second aspect, an embodiment of the present application provides a method for locating a cable outer sheath fault, the method comprising:

[0031] Applying a first constant current and a second constant current to the cable to be tested respectively;

[0032] Obtaining a first temperature rise performance at each position of the cable under the action of a first constant current, and a second temperature rise performance at each position of the cable under the action of a second constant current;

[0033] Determining temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance;

[0034] When the temperature rise comparison feature meets the preset conditions, it is determined that there is an outer sheath fault in the cable, and the outer sheath fault position is determined according to the temperature rise comparison feature.

[0035] Further, determining temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance includes:

[0036] Draw the temperature rise curves of various positions of the cable under the action of the first constant current and the second constant current;

[0037] The temperature rise curves under the first constant current and the second constant current are compared according to the cable position, the temperature rise difference at each position of the cable under the two constant currents is calculated, and a temperature rise difference distribution diagram is drawn.

[0038] In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in the first aspect.

[0039] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented.

[0040] In a fifth aspect, an embodiment of the present application provides a chip, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the method described in the first aspect.

[0041] In the embodiment of the present application, the current application module is used to apply the first constant current and the second constant current to the cable to be tested respectively; the temperature rise performance acquisition module is used to obtain the first temperature rise performance of each position of the cable under the action of the first constant current, and the second temperature rise performance of each position of the cable under the action of the second constant current; the temperature rise comparison feature determination module is used to determine the temperature rise comparison characteristics of the two constant currents according to the first temperature rise performance and the second temperature rise performance; the outer sheath fault determination module is used to determine that the cable has an outer sheath fault when the temperature rise comparison characteristics meet the preset conditions, and determine the outer sheath fault location according to the temperature rise comparison characteristics. Through the above-mentioned cable outer sheath fault locating device, the outer sheath damage of the cable can be detected in time, and the specific location of the outer sheath damage can be determined, which is conducive to the rapid location of the fault point without the need for staff to enter the cable trench, and improves the location efficiency of the fault point and the operation safety during the inspection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of a cable outer sheath fault locating device provided in Example 1 of the present application;

[0043] Figure 2 It is a structural schematic diagram of a cable outer sheath fault locating device provided in Example 2 of the present application;

[0044] Figure 3 It is a structural schematic diagram of a cable outer sheath fault locating device provided in Example 3 of the present application;

[0045] Figure 4 It is a flow chart of a cable outer sheath fault location method provided in Embodiment 4 of the present application;

[0046] Figure 5 It is a schematic diagram of the structure of an electronic device provided in Example 5 of the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present application clearer, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for the convenience of description, only the part related to the present application but not all the contents are shown in the accompanying drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow chart describes each operation (or step) as a sequential process, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of each operation can be rearranged. The process can be terminated when its operation is completed, but it can also have additional steps not included in the accompanying drawings. The process can correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0049] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0050] The cable outer sheath fault locating device, method and equipment provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0051] Embodiment 1

[0052] Figure 1 Schematic diagram of the structure of the cable sheath fault location device provided in Example 1 of the present application. Figure 1 As shown, the specific steps include:

[0053] A current applying module 101, used for applying a first constant current and a second constant current to the cable to be tested respectively;

[0054] A temperature rise performance acquisition module 102 is used to acquire a first temperature rise performance of each position of the cable under the action of a first constant current, and a second temperature rise performance of each position of the cable under the action of a second constant current;

[0055] A temperature rise comparison characteristic determination module 103, configured to determine temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance;

[0056] The outer sheath fault determination module 104 is used to determine that the outer sheath fault exists in the cable when the temperature rise comparison feature meets the preset conditions, and determine the outer sheath fault position according to the temperature rise comparison feature.

[0057] The application scenario of this solution can be the scenario of identifying and locating the damage of the cable outer sheath.

[0058] Based on the above scenario, it can be understood that the executor of this scenario can be an intelligent terminal that identifies whether the outer sheath of the cable is damaged, such as a desktop computer, a laptop computer, a tablet computer, and an interactive multimedia device, etc., and no excessive limitations are made here.

[0059] The current applying module 101 may be a power source, which may be arranged at one end of the cable to be tested, and is used to apply a constant current to the cable to be tested. Specifically, the first constant current may be a constant current applied to the cable for the first time. Among them, the constant current may refer to a current in a circuit that passes through the cable and whose magnitude and direction do not change over time. This current may be directly generated by a constant voltage. When there is no resistance or load in the circuit, the voltage that generates the constant current is called an open circuit electromotive force.

[0060] The second constant current may be a constant current applied to the cable under test for the second time, wherein the second constant current is different from the first constant current, and both the first constant current and the second constant current do not exceed the carrying capacity of the cable under test.

[0061] The method of applying the first constant current and the second constant current to the cable to be tested can be that after determining the cable to be tested, a power supply is used to apply the first constant current to the cable to be tested, the temperature rise performance of the cable to be tested is recorded, the first constant current is disconnected, and after the temperature of the cable returns to the temperature before the first constant current is applied, the output current value of the power supply is adjusted to apply the second constant current to the cable.

[0062] The temperature rise performance acquisition module 102 may be a temperature sensor, which may be evenly arranged in the extension direction of the cable to be tested, and is used to obtain the temperature rise performance of the cable under the first constant current and the second constant current. Specifically, the first temperature rise performance may be the temperature data growth process of the cable to be tested from before the current is applied to the maximum temperature under the action of the first constant current.

[0063] The second temperature rise performance may be the temperature data growth process of the cable under test from before the current is applied to the highest temperature under the action of the second constant current.

[0064] The first temperature rise performance and the second temperature rise performance can be obtained by evenly arranging the temperature sensors at preset intervals along the extension direction of the cable and in close contact with the surface of the cable to accurately sense the temperature of the cable. A first constant current is applied to the cable, and the temperature sensor is started at the same time. When the cable works under the constant current, the heat generated by the current passing through the cable will increase the temperature of the cable. The thermistor in the temperature sensor senses the temperature change of the cable and changes its own resistance value accordingly. The circuit inside the temperature sensor captures the change in the resistance value of the thermistor and converts it into an electrical signal. This electrical signal is then further processed and converted into a readable temperature value. The converted temperature data will be recorded and sent to the smart terminal. After the first temperature rise performance is recorded, the first constant current is disconnected to cool the cable. When the cable temperature returns to the temperature value before the first constant current is applied, the second constant current is applied to the cable, and the above steps are repeated to record the second temperature rise performance.

[0065] The temperature rise comparison characteristic determination module 103 may be a program design of the intelligent terminal for determining the temperature rise comparison characteristic of the first temperature rise performance and the second temperature rise performance. Specifically, the temperature rise comparison characteristic may be the difference in the temperature rise trend of the same cable under the first constant current and the second constant current.

[0066] The method for determining the temperature rise comparison characteristics of two constant currents can be to extract characteristics of the first temperature rise performance and the second temperature rise performance respectively, obtain characteristic data such as the heating time, maximum temperature value, heating rate and temperature distribution of the cable under the first constant current and the second constant current respectively, compare the characteristic data of the first temperature rise performance and the characteristic data of the second temperature rise performance respectively, and calculate the difference between the characteristic data such as the heating time, maximum temperature value, heating rate and temperature distribution as the temperature rise comparison characteristics of the two constant currents.

[0067] The outer sheath fault determination module 104 may be a program design for the intelligent terminal to determine whether the cable has an outer sheath fault according to the temperature rise comparison feature and identify the fault location. Specifically, the preset condition may be a pre-acquired temperature rise comparison feature for determining whether the cable has an outer sheath fault.

[0068] Outer sheath failure may be damage to the cable outer sheath due to external force, wear or aging during the use of the cable.

[0069] A method for determining whether a cable has an outer sheath fault is to obtain in advance the temperature rise comparison characteristics of a cable known to have an outer sheath fault as a comparison sample. After obtaining the temperature rise comparison characteristics of the current cable, compare it with the comparison sample. If there is a record in the comparison sample that is consistent with the temperature rise comparison characteristics of the current cable, it is determined that the cable has an outer sheath fault.

[0070] The method for determining the location of the outer sheath fault is to analyze the temperature rise comparison characteristics after determining that the current cable has an outer sheath fault, identify the sudden temperature increase data in the temperature rise comparison characteristics, and obtain the temperature sensor that collects the sudden temperature increase data, and use the setting position of the temperature sensor as the outer sheath fault location.

[0071] In the embodiment of the present application, the current application module is used to apply the first constant current and the second constant current to the cable to be tested respectively; the temperature rise performance acquisition module is used to obtain the first temperature rise performance of each position of the cable under the action of the first constant current, and the second temperature rise performance of each position of the cable under the action of the second constant current; the temperature rise comparison feature determination module is used to determine the temperature rise comparison characteristics of the two constant currents according to the first temperature rise performance and the second temperature rise performance; the outer sheath fault determination module is used to determine that the cable has an outer sheath fault when the temperature rise comparison characteristics meet the preset conditions, and determine the outer sheath fault location according to the temperature rise comparison characteristics. Through the above-mentioned cable outer sheath fault locating device, the outer sheath damage of the cable can be detected in time, and the specific location of the outer sheath damage can be determined, which is conducive to the rapid location of the fault point without the need for staff to enter the cable trench, and improves the location efficiency of the fault point and the operation safety during the inspection process.

[0072] Embodiment 2

[0073] Figure 2 It is a structural schematic diagram of the cable outer sheath fault locating device provided in Example 2 of the present application. This solution makes a better improvement on the above-mentioned embodiment, and the specific improvement is: the temperature rise comparison feature determination module is specifically used to: draw the temperature rise curve of each position of the cable under the action of the first constant current and the second constant current; compare the temperature rise curve under the action of the first constant current and the second constant current according to the cable position, calculate the temperature rise difference of each position of the cable under the action of the two constant currents, and draw a temperature rise difference distribution diagram.

[0074] like Figure 2 As shown, specifically including the following:

[0075] A current applying module 201, used to apply a first constant current and a second constant current to the cable to be tested;

[0076] A temperature rise performance acquisition module 202 is used to acquire a first temperature rise performance of each position of the cable under the action of a first constant current, and a second temperature rise performance of each position of the cable under the action of a second constant current;

[0077] A temperature rise comparison characteristic determination module 203, configured to determine the temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance;

[0078] The outer sheath fault determination module 204 is used to determine that the outer sheath fault exists in the cable when the temperature rise comparison feature meets the preset conditions, and determine the outer sheath fault position according to the temperature rise comparison feature.

[0079] The temperature rise comparison feature determination module 203 is specifically used for:

[0080] Draw the temperature rise curves of various positions of the cable under the action of the first constant current and the second constant current;

[0081] The temperature rise curves under the first constant current and the second constant current are compared according to the cable position, the temperature rise difference at each position of the cable under the two constant currents is calculated, and a temperature rise difference distribution diagram is drawn.

[0082] The method for drawing the temperature rise curve of each position of the cable under the action of the first constant current and the second constant current can be to obtain the temperature data of the temperature sensors at each position of the cable under the action of the first constant current and the second constant current respectively, establish a rectangular coordinate system with the position of the temperature sensor as the horizontal coordinate and the temperature data collected by the temperature sensor as the vertical coordinate, and mark the temperature data at the corresponding position in the rectangular coordinate system, and use a smooth curve to connect the temperature data in sequence to obtain the temperature rise curve of each position of the cable under the action of the first constant current and the second constant current.

[0083] The method for drawing the temperature rise difference distribution diagram is to fit the temperature rise curves under the first constant current and the second constant current according to the cable position, and calculate the difference between the temperature data under the first constant current and the temperature data under the second constant current in each position, and make a corresponding bar chart based on the difference, and place it at the corresponding position in the rectangular coordinate system with the position of the temperature sensor as the horizontal coordinate and the temperature data as the vertical coordinate to form a temperature rise difference distribution diagram.

[0084] The advantage of this arrangement of the present invention is that a temperature rise difference distribution diagram can be drawn based on the temperature rise curves under the first constant current and the second constant current, making the difference between the first temperature rise performance and the second temperature rise performance more obvious, which is conducive to making the subsequent outer sheath fault determination more accurate.

[0085] Based on the above solution, optionally, the outer sheath fault determination module is specifically used to:

[0086] Identify whether there is a local abnormal area in the temperature rise difference distribution map where the temperature rise difference is greater than a set threshold;

[0087] If so, it is determined that there is an outer sheath fault in the cable.

[0088] The set threshold value may be a preset maximum difference between the first temperature rise performance and the second temperature rise performance that may occur when the cable operates normally.

[0089] A method for identifying whether there is a local abnormal area is to compare the differences in the temperature rise difference distribution diagram with the set thresholds respectively. If the differences in the temperature rise difference distribution diagram do not exceed the set thresholds, then there is no local abnormal area in the temperature rise difference distribution diagram, that is, there is no outer sheath fault in the cable; if there is a difference greater than the set threshold, it is determined that there is a local abnormal area, that is, there is an outer sheath fault in the cable.

[0090] The advantage of this setting of the scheme is that it can determine whether the cable has an outer sheath fault through the temperature rise difference distribution diagram and the set threshold, providing a judgment basis for the identification of the cable outer sheath fault, which is conducive to increasing the accuracy of determining the cable outer sheath fault.

[0091] Based on the above solution, optionally, the outer sheath fault determination module is specifically used to:

[0092] When it is determined that there is an outer sheath fault in the cable, the temperature rise difference distribution diagram is analyzed, and the cable position corresponding to the local abnormal area is obtained to determine the outer sheath fault position.

[0093] The method for determining the location of the outer sheath fault is that, when it is determined that the cable has an outer sheath fault, the horizontal coordinate information corresponding to the local abnormal area in the temperature rise difference distribution diagram is obtained, and the location of the temperature sensor that collects temperature data of the local abnormal area is determined according to the horizontal coordinate information, and the location is determined as the outer sheath fault location.

[0094] The advantage of this arrangement of the present scheme is that the outer sheath fault location can be directly determined according to the location of the temperature sensor corresponding to the local abnormal area in the temperature rise difference distribution diagram, which is conducive to intuitively and accurately obtaining the outer sheath fault location and improving the maintenance efficiency of the cable outer sheath fault location.

[0095] Embodiment 3

[0096] Figure 3It is a structural schematic diagram of the cable outer sheath fault locating device provided in Example 3 of the present application. This solution makes a better improvement on the above-mentioned embodiment, and the specific improvement is: the device also includes: an environmental data acquisition module, which is used to collect environmental data of the cable laying location; wherein the environmental data includes ambient temperature, ambient humidity and ambient air pressure; correspondingly, the outer sheath fault determination module is also used to: obtain the degree of influence of the environmental data on the heat dissipation effect of the cable; determine the standard temperature rise comparison characteristics of the cable in normal operation according to the degree of influence; determine the preset conditions under the current environmental data according to the standard temperature rise comparison characteristics.

[0097] like Figure 3 As shown, specifically including the following:

[0098] The current applying module 301 is used to apply a first constant current and a second constant current to the cable to be tested respectively;

[0099] A temperature rise performance acquisition module 302 is used to acquire a first temperature rise performance of each position of the cable under the action of a first constant current, and a second temperature rise performance of each position of the cable under the action of a second constant current;

[0100] A temperature rise comparison characteristic determination module 303, configured to determine the temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance;

[0101] An outer sheath fault determination module 304 is used to determine that the cable has an outer sheath fault when the temperature rise comparison feature meets a preset condition, and to determine the outer sheath fault location according to the temperature rise comparison feature;

[0102] The environmental data acquisition module 305 is used to collect environmental data of the cable laying location; wherein the environmental data includes environmental temperature, environmental humidity and environmental air pressure.

[0103] Wherein, the outer sheath fault determination module 304 is also used to obtain the influence degree of the environmental data on the heat dissipation effect of the cable;

[0104] Determining, according to the degree of influence, a standard temperature rise comparison characteristic of the cable during normal operation;

[0105] The preset conditions under the current environmental data are determined according to the standard temperature rise comparison characteristics.

[0106] The environmental data acquisition module 305 can be an environmental data acquisition device integrated with a temperature sensor, a humidity sensor, and an air pressure sensor, which can be set at the cable laying position to collect environmental data at the cable laying position. Specifically, the way to obtain the ambient temperature can be that when the ambient temperature of the cable laying position changes, the thermistor in the temperature sensor senses the temperature change of the environment and changes its own resistance value accordingly. The circuit inside the temperature sensor will capture the change in the resistance value of the thermistor and convert it into an electrical signal. This electrical signal is then further processed and converted into a temperature value that can be read.

[0107] The way to obtain the ambient humidity is that the humidity sensor consists of a layer of humidity sensitive material between two metal electrodes. When the moisture in the environment increases, the humidity sensitive material absorbs moisture, causing the capacitance value of the two metal electrodes to increase. By measuring the change in capacitance value, the humidity moisture content in the environment can be determined.

[0108] The way to obtain the ambient air pressure is that when the air pressure in the cable laying environment changes, the sensitive elements inside the sensor, such as piezoelectric crystals, thin films or piezoresistive elements, will respond to the change in external air pressure and convert the air pressure change into electrical signal output through piezoelectric effect, piezoresistive effect or film deformation. These electrical signals are then collected and processed to obtain the specific value of the ambient air pressure.

[0109] The degree of influence of environmental data on the heat dissipation effect of the cable can be the degree to which the environmental data changes the heat dissipation effect of the normally operating cable. For example, an increase in ambient temperature may increase the difficulty of natural heat dissipation of the cable, resulting in faster temperature rise of the cable; changes in ambient humidity may affect the insulation performance of the cable; changes in air pressure may affect the airflow conditions around the cable. When the airflow velocity is high, the heat dissipation effect of the cable is better, and when the airflow velocity is low, the heat dissipation effect of the cable is poor.

[0110] The method for determining the standard temperature rise comparison characteristics of the cable during normal operation can be to obtain the temperature rise comparison characteristics of the cable under test during normal operation when the heat dissipation effect is affected by the current degree through big data, and use the search result as the standard temperature rise comparison characteristics.

[0111] The method for determining the preset conditions under the current environmental data is that the staff can input the floating range of the temperature rise comparison characteristics during normal operation of the cable into the smart terminal in advance. After obtaining the standard temperature rise comparison characteristics, the smart terminal uses the sum of the standard temperature rise comparison characteristics and the maximum floating data in the floating range as the preset conditions under the current environmental data.

[0112] The advantage of this setting of the scheme is that it can take into account the impact of environmental data on the comparative characteristics of cable temperature rise, adjust the preset conditions according to the current environmental data, and increase the accuracy of judging the cable outer sheath fault.

[0113] Based on the above solution, optionally, the device further includes:

[0114] A fault cause determination module, used to obtain environmental data of the outer sheath fault location when it is determined that the outer sheath fault exists in the cable;

[0115] The environmental data and the temperature rise comparison characteristics are input into a pre-built cause analysis model, and the cause of the outer sheath failure is determined according to an output result of the cause analysis model.

[0116] The pre-built cause analysis model may be a neural network model that can predict the cause of a fault through environmental data and temperature rise comparison characteristics.

[0117] The method for obtaining environmental data of the outer sheath fault location is to obtain the outer sheath fault location of the cable, send an environmental data acquisition instruction to the environmental data acquisition device at the outer sheath fault location, and use the feedback information of the environmental data acquisition device as the environmental data of the outer sheath fault location.

[0118] The method for determining the cause of the outer sheath fault is to input the currently acquired environmental data of the outer sheath fault location and the temperature rise comparison characteristics of the outer sheath fault location into a pre-built cause analysis model, and the cause analysis model predicts the cause of the fault based on the learned correlation between the fault cause and the environmental data and the temperature rise comparison characteristics.

[0119] Based on the above solution, optionally, the device further includes:

[0120] The model building module is used to predict the possible fault causes of the outer sheath, obtain the environmental data corresponding to each fault cause and the temperature rise comparison characteristics as test samples, perform supervised training on the test samples, and obtain a cause analysis model.

[0121] The method for obtaining the test sample is to predict the possible failure causes of the outer sheath, and to obtain the cables with outer sheath failures caused by various failure causes for testing, that is, to obtain the environmental data of the location of the cable and to apply the first constant current and the second constant current to the cable, to obtain the temperature rise comparison characteristics of the cable, and to use the environmental data, the temperature rise comparison characteristics and their corresponding failure causes as test samples for constructing a cause analysis model.

[0122] The cause analysis model can be obtained by taking the environmental data and temperature rise comparison features in the test sample as input variables, taking the corresponding fault causes in the test sample as labels, performing supervised training, obtaining the correlation between the fault cause and the environmental data and temperature rise comparison features, and then constructing a cause analysis model that can predict the fault cause through environmental data and temperature rise comparison features.

[0123] The advantage of this arrangement of the scheme is that a cause analysis model can be constructed based on the test samples, and the actual outer sheath failure case can be used as the test sample, so that the algorithm in the cause analysis model is more in line with the actual situation and the determination of the cause of the failure is more accurate.

[0124] Embodiment 4

[0125] Figure 4 It is a flow chart of the cable outer sheath fault locating method provided in Example 4 of the present application.

[0126] like Figure 4 As shown, the specific steps include:

[0127] S401, applying a first constant current and a second constant current to the cable to be tested respectively;

[0128] S402, obtaining a first temperature rise performance at each position of the cable under the action of a first constant current, and a second temperature rise performance at each position of the cable under the action of a second constant current;

[0129] S403, determining temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance;

[0130] S404: When the temperature rise comparison feature meets a preset condition, determine that there is an outer sheath fault in the cable, and determine the outer sheath fault position according to the temperature rise comparison feature.

[0131] Optionally, determining temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance includes:

[0132] Draw the temperature rise curves of various positions of the cable under the action of the first constant current and the second constant current;

[0133] The temperature rise curves under the first constant current and the second constant current are compared according to the cable position, the temperature rise difference at each position of the cable under the two constant currents is calculated, and a temperature rise difference distribution diagram is drawn.

[0134] In an embodiment of the present application, a first constant current and a second constant current are applied to the cable to be tested respectively; a first temperature rise performance of each position of the cable under the action of the first constant current and a second temperature rise performance of each position of the cable under the action of the second constant current are obtained; the temperature rise comparison characteristics of the two constant currents are determined according to the first temperature rise performance and the second temperature rise performance; when the temperature rise comparison characteristics meet the preset conditions, it is determined that the cable has an outer sheath fault, and the outer sheath fault position is determined according to the temperature rise comparison characteristics. Through the above-mentioned cable outer sheath fault location method, the outer sheath damage of the cable can be detected in time, and the specific location of the outer sheath damage can be determined, which is conducive to the rapid location of the fault point without the need for staff to enter the cable trench, and improves the location efficiency of the fault point and the safety of the operation during the inspection process.

[0135] The cable sheath fault locating method provided in the embodiment of the present application corresponds to the cable sheath fault locating device provided in the above embodiment, and has the same functional modules and beneficial effects. To avoid repetition, they will not be described here.

[0136] Embodiment 5

[0137] like Figure 5 As shown, an embodiment of the present application also provides an electronic device 500, including a processor 501, a memory 502, and a program or instruction stored in the memory 502 and executable on the processor 501. When the program or instruction is executed by the processor 501, each process of the above-mentioned cable outer sheath fault locating device embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0138] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0139] Embodiment 6

[0140] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned cable outer sheath fault locating device embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0141] The processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0142] Embodiment 7

[0143] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned cable outer sheath fault locating device embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0144] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0145] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0146] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0147] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0148] The above are only preferred embodiments of the present application and the technical principles used. The present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions that can be made by those skilled in the art will not deviate from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A cable outer sheath fault location device, characterized in that: The device comprises: A current applying module, used for respectively applying a first constant current and a second constant current to the cable to be tested; A temperature rise performance acquisition module, used to acquire a first temperature rise performance of each position of the cable under the action of a first constant current, and a second temperature rise performance of each position of the cable under the action of a second constant current; A temperature rise comparison characteristic determination module, used to determine the temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance; The outer sheath fault determination module is used to determine that the cable has an outer sheath fault when the temperature rise comparison feature meets the preset conditions, and determine the outer sheath fault position according to the temperature rise comparison feature.

2. The cable outer sheath fault locating device according to claim 1, characterized in that: The temperature rise comparison feature determination module is specifically used for: Draw the temperature rise curves of various positions of the cable under the action of the first constant current and the second constant current; The temperature rise curves under the first constant current and the second constant current are compared according to the cable position, the temperature rise difference at each position of the cable under the two constant currents is calculated, and a temperature rise difference distribution diagram is drawn.

3. The cable outer sheath fault locating device according to claim 2, characterized in that: The outer sheath fault determination module is specifically used to: Identify whether there is a local abnormal area in the temperature rise difference distribution map where the temperature rise difference is greater than a set threshold; If so, it is determined that there is an outer sheath fault in the cable.

4. The cable outer sheath fault locating device according to claim 2, characterized in that: The outer sheath fault determination module is specifically used to: When it is determined that there is an outer sheath fault in the cable, the temperature rise difference distribution diagram is analyzed, and the cable position corresponding to the local abnormal area is obtained to determine the outer sheath fault position.

5. The cable outer sheath fault locating device according to claim 1, characterized in that: The device also includes: An environmental data acquisition module is used to collect environmental data of the cable laying location; wherein the environmental data includes environmental temperature, environmental humidity and environmental air pressure; Correspondingly, the outer sheath fault determination module is also used for: Acquiring the influence degree of the environmental data on the heat dissipation effect of the cable; Determining, according to the degree of influence, a standard temperature rise comparison characteristic of the cable during normal operation; The preset conditions under the current environmental data are determined according to the standard temperature rise comparison characteristics.

6. The cable outer sheath fault locating device according to claim 5, characterized in that: The device also includes: A fault cause determination module, used to obtain environmental data of the outer sheath fault location when it is determined that the outer sheath fault exists in the cable; The environmental data and the temperature rise comparison characteristics are input into a pre-built cause analysis model, and the cause of the outer sheath failure is determined according to an output result of the cause analysis model.

7. The cable outer sheath fault locating device according to claim 6, characterized in that: The device also includes: The model building module is used to predict the possible fault causes of the outer sheath, obtain the environmental data corresponding to each fault cause and the temperature rise comparison characteristics as test samples, perform supervised training on the test samples, and obtain a cause analysis model.

8. A method for locating a cable outer sheath fault, characterized in that: The method comprises: Applying a first constant current and a second constant current to the cable to be tested respectively; Obtaining a first temperature rise performance at each position of the cable under the action of a first constant current, and a second temperature rise performance at each position of the cable under the action of a second constant current; Determining temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance; When the temperature rise comparison feature meets the preset conditions, it is determined that there is an outer sheath fault in the cable, and the outer sheath fault position is determined according to the temperature rise comparison feature.

9. The cable outer sheath fault location method according to claim 8, characterized in that: Determining temperature rise comparison characteristics of two constant currents according to the first temperature rise performance and the second temperature rise performance includes: Draw the temperature rise curves of various positions of the cable under the action of the first constant current and the second constant current; The temperature rise curves under the first constant current and the second constant current are compared according to the cable position, the temperature rise difference at each position of the cable under the two constant currents is calculated, and a temperature rise difference distribution diagram is drawn.

10. An electronic device, characterized in that: It comprises a processor, a memory and a program or instruction stored in the memory and executable on the processor, wherein when the program or instruction is executed by the processor, the steps of the cable outer sheath fault locating method as described in any one of claims 8 to 9 are implemented.

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