Photovoltaic cable for photovoltaic system control and heat resistance detection method thereof

Abstract

The invention relates to the technical field of photovoltaic cable manufacturing, in particular to a photovoltaic cable for photovoltaic system control and a heat resistance detection method thereof, which can improve the heat resistance of the photovoltaic cable in a high-temperature environment and improve the ultraviolet resistance and corrosion resistance of the photovoltaic cable. Comprising conductors, insulating sleeves and an outer sheath, the number of the conductors is three, each conductor is wrapped by one insulating sleeve, the three conductors wrapped by the insulating sleeves are mutually twisted, and the outer sheath is wrapped outside the three insulating sleeves; the conductors are made of tinned copper conductor materials, and the insulating sleeves and the outer sheath are made of cross-linked polyethylene insulating materials.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cable manufacturing, and in particular to a photovoltaic cable for photovoltaic system control and a heat resistance detection method thereof. Background Art

[0002] Photovoltaic cables are key components of the wiring system that connects photovoltaic modules and inverters. Failure to use dedicated cables for solar applications will affect the service life of the entire system. Solar systems are often used in harsh environmental conditions, such as high temperature and ultraviolet radiation.

[0003] In the case of photovoltaics, materials used outdoors are subject to ultraviolet light, ozone, drastic temperature changes and chemical corrosion. Using low-grade materials under such environmental stress will cause the cable sheath to be brittle and decompose the cable insulation layer. All of these situations will directly increase the damage to the cable system, and the risk of cable short circuits will also increase. In the long run, the possibility of fire or personal injury is also higher.

[0004] During installation and maintenance, cables can be routed on the sharp edges of the roof structure, and the cables must withstand pressure, bending, tension, cross-tension loads and strong impacts. If the cable sheath is not strong enough, the cable insulation layer will be severely damaged, affecting the life of the entire cable, or causing short circuits, fires and personal injury hazards. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a heat resistance detection method for photovoltaic cables used for photovoltaic system control, which increases the heat resistance of photovoltaic cables in high temperature environments and improves the UV resistance and corrosion resistance of photovoltaic cables.

[0006] In a first aspect, the present invention provides a photovoltaic cable for controlling a photovoltaic system, comprising a conductor, an insulating sheath and an outer sheath, wherein the conductor is provided in three groups, each group of the conductors is wrapped with a group of insulating sheaths, the three groups of conductors wrapped with insulating sheaths are twisted together, and the outer sides of the three groups of insulating sheaths are wrapped with outer sheaths; the conductor is made of tinned copper conductor material, and the insulating sheath and the outer sheath are both made of cross-linked polyethylene insulation material.

[0007] A method for detecting heat resistance of a photovoltaic cable for photovoltaic system control, the method comprising:

[0008] Obtain parameter information of the photovoltaic cable to be tested;

[0009] According to the parameter information of the photovoltaic cable to be tested, cable testing items are formulated, and the cable testing items include heat aging test, high temperature tensile test, high temperature cycle test and insulation resistance test;

[0010] Intercept multiple groups of samples, classify and mark each group of samples according to the cable detection items, and integrate the marks of each group of samples to obtain a test sample set;

[0011] According to the cable detection items, the marked samples in the test sample set are classified and tested to obtain a heat resistance detection data set;

[0012] Inputting the heat resistance test data set into the pre-built heat resistance performance analysis model to obtain the heat resistance performance index;

[0013] Compare the heat resistance performance index with the preset heat resistance performance threshold. If the heat resistance performance index exceeds the preset heat resistance performance threshold, it means that this batch of photovoltaic cables is qualified. If the heat resistance performance index does not exceed the preset heat resistance performance threshold, it means that this batch of cables is unqualified.

[0014] Furthermore, the method for obtaining the test sample set includes:

[0015] Randomly select a sufficient number of samples from the batch of photovoltaic cables to be tested;

[0016] According to the requirements of different testing items, each cable sample is cut into small sections of appropriate length;

[0017] Clearly and durably mark each sample with the sample number, source batch number, and corresponding test items;

[0018] Classify all labeled samples according to the test items they belong to;

[0019] Package the classified samples to prevent damage during transportation;

[0020] All samples are correctly assigned to the corresponding test items to form a test sample set.

[0021] Furthermore, the method of the thermal aging test comprises:

[0022] Selecting a sample marked for heat aging test from the test sample set;

[0023] Set the temperature of the aging box according to the actual working environment and expected life of the photovoltaic cable;

[0024] The sample is fixedly installed in the aging box;

[0025] Start the aging box, start heating and maintain the set temperature and humidity conditions;

[0026] Record the time the test starts and set the test duration;

[0027] Collect data on changes in sample performance during and after testing;

[0028] Based on the collected data, the performance changes of the samples during the aging test are evaluated.

[0029] Furthermore, the high temperature tensile test method comprises:

[0030] Select a specimen marked for elevated temperature tensile testing from the test specimen set;

[0031] Set the temperature of the high temperature environment box according to the actual working environment and expected life of the photovoltaic cable;

[0032] Fix one end of the sample to the fixture in the high temperature environment box, and connect the other end to the fixture of the tensile testing machine;

[0033] Adjust the position and angle of the fixture so that the sample is in the correct stress state during the stretching process;

[0034] Start the high temperature environment box and tensile testing machine, start heating and maintain the set temperature;

[0035] When the temperature reaches the set value and stabilizes, the tensile test begins;

[0036] During the stretching process, record the force and elongation curve of the sample, as well as the force and elongation when the sample breaks;

[0037] At the end of the test, data on the tensile properties of the specimens were collected;

[0038] Based on the collected data, the tensile properties of the samples under elevated temperature conditions were evaluated.

[0039] Furthermore, the high temperature cycle test method comprises:

[0040] Selecting a sample marked as a high temperature cycle test from the test sample set;

[0041] Set the temperature range of the high temperature cycle test chamber according to the actual working environment and expected life of the photovoltaic cable;

[0042] Set the number of cycles of the high temperature cycle test chamber and the high temperature duration in each cycle;

[0043] The sample is fixedly installed in a high temperature cycle test chamber;

[0044] Start the high temperature cycle test chamber, start heating and maintain the set temperature range;

[0045] In each cycle, when the temperature reaches the set high temperature value, the timing starts and is maintained for the set duration;

[0046] After the high temperature duration is over, let the test chamber cool to room temperature and then start the next cycle; repeat the cycle process until the set number of cycles is reached;

[0047] During the test, regularly check the specimens for changes in appearance and performance, and record all observed changes and measurements;

[0048] Based on the collected data, the performance stability of the samples in high temperature cycle tests was evaluated.

[0049] Furthermore, the insulation resistance test method comprises:

[0050] Select a sample marked for insulation resistance test from the test sample set;

[0051] Set the test voltage of the insulation resistance tester according to the specifications and test standards of the photovoltaic cable;

[0052] Set the test time to ensure that there is enough time for the measurement results to stabilize during the test;

[0053] Use test electrodes and connecting wires to connect both ends of the sample to the insulation resistance tester;

[0054] Start the insulation resistance tester and begin to apply the set test voltage; when the test time reaches the set value, record the final insulation resistance value displayed by the insulation resistance tester.

[0055] Furthermore, the method for constructing the heat resistance performance analysis model comprises:

[0056] Collect historical thermal performance data;

[0057] Clean, organize and normalize the collected data;

[0058] Selecting a machine learning model as the basis of the heat resistance performance analysis model; the machine learning model includes a decision tree, a random forest, a support vector machine, and a neural network;

[0059] Use the preprocessed data to train the model;

[0060] The model was evaluated using the cross-validation method to test the generalization ability and stability of the model;

[0061] According to the results of cross-validation, the model is optimized and adjusted;

[0062] Deploy the trained and optimized model to the corresponding computing platform.

[0063] In a third aspect, the present application provides an electronic device, comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, and the computer program, when executed by the processor, implements the steps of any one of the above methods.

[0064] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps in any one of the above-mentioned methods when executed by a processor.

[0065] Compared with the prior art, the present invention has the following beneficial effects: since solar energy systems are often used in harsh environmental conditions, the cable is made of specific materials and can effectively resist ultraviolet rays, ozone, drastic temperature changes and chemical corrosion, thereby avoiding the problem of fragile cable sheath and decomposition of insulation layer;

[0066] Using dedicated PV cables can reduce the risk of cable system damage and the possibility of cable short circuits, thereby reducing the risk of fire or personal injury;

[0067] During installation and maintenance, the cable will be subjected to various mechanical stresses. The photovoltaic cable adopts tinned copper conductor and cross-linked polyethylene insulation material to enhance the durability and damage resistance of the cable, thereby extending the service life of the cable;

[0068] The three groups of conductors are all wrapped with insulating sleeves and twisted together. This design not only improves the electrical performance of the cable, but also increases its overall strength and stability. The twisted structure helps to disperse mechanical stress and electromagnetic interference, and improves the reliability and durability of the cable.

[0069] In summary, photovoltaic cables used for photovoltaic system control have increased their heat resistance in high temperature environments, improved their UV resistance and corrosion resistance through special design and material selection, and met the low-smoke and halogen-free requirements under current environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 It is a schematic diagram of the structure of the present invention;

[0071] Figure 2 It is a flow chart of the heat resistance testing method of photovoltaic cables used for photovoltaic system control;

[0072] Markings in the accompanying drawings: 1, conductor; 2, insulating sleeve; 3, outer sheath. DETAILED DESCRIPTION

[0073] In the description of the present application, those skilled in the art should know that the present application can be implemented as a method, an apparatus, an electronic device, and a computer-readable storage medium. Therefore, the present application can be specifically implemented in the following forms: complete hardware, complete software (including firmware, resident software, microcode, etc.), a combination of hardware and software. In addition, in some embodiments, the present application can also be implemented in the form of a computer program product in one or more computer-readable storage media, and the computer-readable storage medium contains computer program code.

[0074] The above-mentioned computer-readable storage medium may adopt any combination of one or more computer-readable storage media. Computer-readable storage media include: electrical, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or devices, or any combination of the above. More specific examples of computer-readable storage media include: portable computer disks, hard disks, random access memories, read-only memories, erasable programmable read-only memories, flash memories, optical fibers, optical disc read-only memories, optical storage devices, magnetic storage devices, or any combination of the above. In the present application, computer-readable storage media can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device, or device.

[0075] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws.

[0076] The present application describes the provided methods, devices, and electronic devices through flowcharts and / or block diagrams.

[0077] It should be understood that each box in the flowchart and / or block diagram and the combination of boxes in the flowchart and / or block diagram can be implemented by computer-readable program instructions. These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine, and these computer-readable program instructions are executed by a computer or other programmable data processing device to produce a device that implements the functions / operations specified by the boxes in the flowchart and / or block diagram.

[0078] These computer-readable program instructions may also be stored in a computer-readable storage medium that enables a computer or other programmable data processing device to work in a specific manner. In this way, the instructions stored in the computer-readable storage medium produce an instruction device product including functions / operations specified in the blocks in the flowchart and / or block diagram.

[0079] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device, so that a series of operational steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby enabling the instructions executed on the computer or other programmable data processing apparatus to provide a process for implementing the functions / operations specified in the blocks in the flowchart and / or block diagram.

[0080] The present application is described below in conjunction with the drawings in the present application.

[0081] Embodiment 1: Figure 1 As shown, a photovoltaic cable for controlling a photovoltaic system of the present invention specifically comprises:

[0082] Conductor 1, insulating sleeve 2 and outer sheath 3, the conductor 1 is provided with three groups, each group of the conductor 1 is wrapped with a group of insulating sleeve 2, the three groups of conductors 1 wrapped with insulating sleeves 2 are twisted with each other, and the outer side of the three groups of insulating sleeves 2 is wrapped with outer sheath 3; the conductor 1 is made of tinned copper conductor material, and the insulating sleeve 2 and the outer sheath 3 are both made of cross-linked polyethylene insulation material.

[0083] As solar energy systems are often used in harsh environmental conditions, the cable is made of specific materials that can effectively resist UV rays, ozone, drastic temperature changes, and chemical erosion, thus avoiding the problem of fragile cable sheaths and decomposition of insulation layers;

[0084] Using dedicated PV cables can reduce the risk of cable system damage and the possibility of cable short circuits, thereby reducing the risk of fire or personal injury;

[0085] During installation and maintenance, the cable will be subjected to various mechanical stresses. The photovoltaic cable adopts tinned copper conductor and cross-linked polyethylene insulation material to enhance the durability and damage resistance of the cable, thereby extending the service life of the cable;

[0086] The three groups of conductors are all wrapped with insulating sleeves and twisted together. This design not only improves the electrical performance of the cable, but also increases its overall strength and stability. The twisted structure helps to disperse mechanical stress and electromagnetic interference, and improves the reliability and durability of the cable.

[0087] In summary, photovoltaic cables used for photovoltaic system control have increased their heat resistance in high temperature environments, improved their UV resistance and corrosion resistance through special design and material selection, and met the low-smoke and halogen-free requirements under current environmental protection requirements.

[0088] Embodiment 2: Figure 2 As shown, a heat resistance detection method for a photovoltaic cable for photovoltaic system control of the present invention specifically comprises the following steps:

[0089] S1. Obtain parameter information of the photovoltaic cable to be tested;

[0090] The parameter information of the photovoltaic cable includes:

[0091] Basic cable specifications: Obtain basic specifications of PV cables, including cable model, conductor cross-sectional area, insulation material type, sheath material type, and total cable length; this information helps to understand the basic structure and performance characteristics of the cable and provides basic data for subsequent testing projects;

[0092] Physical properties: record the basic physical properties of the cable, including outer diameter, conductor cross-sectional area, insulation thickness and sheath thickness; these parameters directly affect the mechanical strength and electrical performance of the cable;

[0093] Material composition: Identify the specific materials used for the cable conductor, insulation, shield and jacket; the choice of materials has a significant impact on the cable's weather resistance and long-term reliability;

[0094] Rated voltage and current: determine the working voltage level and the maximum allowable current value of the cable; used to limit the test conditions;

[0095] Working environment temperature range: Understand the ability of the cable to work normally under the extreme temperature, which is used to define the temperature level of high temperature aging test;

[0096] Special functional requirements: Photovoltaic cables have specific functional characteristics, including flame retardancy, UV resistance, oil resistance, waterproofness, etc., which also need to be considered as one of the factors;

[0097] By fully acquiring the parameter information of the photovoltaic cable to be tested, detailed and accurate basic data is provided for subsequent testing projects; these basic data cover the basic specifications, physical properties, material composition, rated voltage and current, operating environment temperature range, special functional requirements and other aspects of the cable, providing strong support for subsequent in-depth analysis and testing.

[0098] S2. Formulate cable testing items according to parameter information of the photovoltaic cable to be tested, wherein the cable testing items include heat aging test, high temperature tensile test, high temperature cycle test and insulation resistance test;

[0099] Thermal aging test: used to evaluate the stability of cable materials under long-term high temperature conditions;

[0100] Place the cable sample in a constant temperature box for a period of time, then take it out and cool it down for appearance inspection, mechanical performance test and electrical performance test;

[0101] High temperature tensile test: used to test the cable's ability to resist stretching under high temperature conditions; in a specific high temperature environment, a certain tensile force is applied to the cable and its tensile behavior is recorded;

[0102] High temperature cycle test: used to simulate the temperature fluctuations that may occur in actual use and test the durability of the cable under temperature changes; the cable sample needs to undergo a series of preset temperature cycles, each cycle includes heating to a high temperature and maintaining it for a period of time, and then cooling to room temperature or lower, and repeating this process multiple times;

[0103] Insulation resistance test: used to measure the insulation performance of cable insulation materials under high temperature conditions to ensure that there are no safety hazards caused by leakage current; in a high temperature environment, a DC voltage is applied to both ends of the cable, and the leakage current through the cable insulation layer is measured to calculate the insulation resistance value;

[0104] When formulating the test items, the actual working environment and use requirements of photovoltaic cables need to be fully considered; for cables installed on the sharp edges of roof structures, special attention should be paid to their mechanical strength and wear resistance; for cables that need to withstand larger currents and voltages, corresponding electrical performance test items should be added;

[0105] In summary, the formulation of cable testing items in step S2 is an important part of the entire heat resistance testing method. It is necessary to formulate comprehensive and accurate testing items based on the parameter information of the photovoltaic cable to be tested and the actual working environment requirements to ensure that the heat resistance of the cable meets the use requirements.

[0106] S3, intercepting multiple groups of samples, classifying and marking each group of samples according to the cable detection items, and integrating the marks of each group of samples to obtain a test sample set;

[0107] The method for obtaining the test sample set includes:

[0108] Randomly select a sufficient number of samples from the batch of PV cables to be tested; the sampling should ensure that it represents the quality level of the entire batch. It is usually recommended to determine the minimum sampling amount according to statistical principles; ensure that the selected samples have no obvious physical damage or other defects that may affect the test results;

[0109] Cut each sample of cable into small sections of appropriate length according to the requirements of different test items; the specific requirements of each test item will be different, so read the relevant standards or guidance documents carefully to determine the appropriate sample size;

[0110] Each sample is clearly and durably labeled for easy identification and tracking; the labeling content includes the sample number, source batch number, and corresponding test items;

[0111] Classify all marked samples according to the test items they belong to; all samples used for heat aging tests are grouped together, all samples used for high temperature tensile tests are grouped together, etc.

[0112] Package the sorted samples to ensure they are not damaged during transportation;

[0113] Confirm that all samples have been prepared and correctly assigned to the corresponding test items to form the final test sample set;

[0114] Through the S3 step, a representative and accurate test sample set can be obtained, providing a solid foundation for subsequent heat resistance testing; it helps to accurately evaluate the heat resistance performance of photovoltaic cables and ensure their reliability and safety in harsh environments.

[0115] S4. According to the cable detection items, the marked samples in the test sample set are classified and detected to obtain a heat resistance detection data set;

[0116] The method of the thermal aging test comprises:

[0117] Select a sample marked for thermal aging testing from the test sample set; inspect the integrity of the sample to ensure there is no damage or defects;

[0118] According to the actual working environment and expected life of the photovoltaic cable, set the temperature of the aging box; set appropriate humidity conditions;

[0119] The sample is fixed in the aging chamber to ensure that it will not move during the test;

[0120] Start the aging box, start heating and maintain the set temperature and humidity conditions;

[0121] Record the time the test starts and set the test duration;

[0122] Collect data on changes in sample performance during and after testing; record all observed changes and measurements for subsequent analysis and evaluation;

[0123] Based on the collected data, evaluate the performance changes of the samples during the aging test;

[0124] The method of high temperature tensile testing comprises:

[0125] Select a sample marked for high temperature tensile test from the test sample set; check whether the sample surface is flat, free of damage or defects to ensure the integrity of the sample;

[0126] Set the temperature of the high temperature environment box according to the actual working environment and expected life of the photovoltaic cable;

[0127] Fix one end of the sample to the fixture in the high temperature environment box to ensure that the sample does not move or fall off during the test; connect the other end to the fixture of the tensile testing machine to ensure that the tensile testing machine can accurately measure the force and elongation of the sample during the stretching process;

[0128] Adjust the position and angle of the fixture so that the sample is in the correct stress state during the stretching process;

[0129] Start the high temperature environment box and tensile testing machine, start heating and maintain the set temperature;

[0130] When the temperature reaches the set value and stabilizes, the tensile test begins;

[0131] During the stretching process, record the force and elongation curve of the sample, as well as the force and elongation when the sample breaks;

[0132] At the end of the test, data on the tensile properties of the specimens were collected;

[0133] Based on the collected data, the tensile properties of the samples under high temperature conditions were evaluated;

[0134] The high temperature cycle test method comprises:

[0135] Select the sample marked for high temperature cycle test from the test sample set; check the integrity of the sample to ensure there is no damage and defects;

[0136] Set the temperature range of the high temperature cycle test chamber according to the actual working environment and expected life of the photovoltaic cable;

[0137] Set the number of cycles of the high temperature cycle test chamber and the high temperature duration in each cycle;

[0138] The sample is fixedly installed in the high temperature cycle test chamber to ensure that it will not move or deform during the test;

[0139] Start the high temperature cycle test chamber, start heating and maintain the set temperature range;

[0140] In each cycle, when the temperature reaches the set high temperature value, the timing starts and is maintained for the set duration;

[0141] After the high temperature duration is over, let the test chamber cool to room temperature and then start the next cycle; repeat the cycle process until the set number of cycles is reached;

[0142] During the test, the samples were regularly checked for changes in appearance and performance, and all observed changes and measurements were recorded for subsequent analysis and evaluation;

[0143] Based on the collected data, the performance stability of the samples in the high temperature cycle test was evaluated;

[0144] The insulation resistance test method comprises:

[0145] Select the sample marked for insulation resistance test from the test sample set; check the integrity of the sample to ensure there is no damage or defects;

[0146] Set the test voltage of the insulation resistance tester according to the specifications and test standards of the photovoltaic cable;

[0147] Set the test time to ensure that there is enough time for the measurement results to stabilize during the test;

[0148] Use the test electrodes and connecting wires to properly connect both ends of the sample to the insulation resistance tester;

[0149] Start the insulation resistance tester and begin applying the set test voltage;

[0150] When the test time reaches the set value, record the final insulation resistance value displayed by the insulation resistance tester;

[0151] If the test standard specifies the insulation resistance value requirements under multiple test voltages, repeat the above test steps under different test voltages and record the insulation resistance value under each voltage;

[0152] Compare the recorded insulation resistance value with the threshold value specified in the test standard; if the insulation resistance value is higher than the threshold value, it indicates that the insulation performance of the cable is good; if it is lower than the threshold value, it indicates that the insulation performance of the cable is unqualified and there may be a risk of electrical leakage or short circuit;

[0153] Through the S4 step, a comprehensive and accurate heat resistance test data set can be obtained, providing a solid foundation for subsequent heat resistance performance analysis and evaluation; it helps to accurately evaluate the heat resistance performance of photovoltaic cables and ensure their reliability and safety in harsh environments.

[0154] S5, inputting the heat resistance test data set into a pre-built heat resistance performance analysis model to obtain a heat resistance performance index;

[0155] The method for constructing the heat resistance performance analysis model comprises:

[0156] Collect a large amount of heat resistance performance data from past photovoltaic cable heat resistance tests, actual use environment data and industry standards;

[0157] Clean, organize and normalize the collected data to ensure data consistency and accuracy, including removing duplicate data, processing missing values ​​and standardizing data formats;

[0158] Selecting a machine learning model as the basis of the heat resistance performance analysis model; the machine learning model includes a decision tree, a random forest, a support vector machine, and a neural network;

[0159] The preprocessed data is used to train the model; during the training process, the parameters and structure of the model are adjusted so that the model can accurately predict the heat resistance performance of photovoltaic cables;

[0160] The model is evaluated using the cross-validation method to test the generalization ability and stability of the model. By splitting the data set multiple times and training and testing separately, the performance of the model on different data sets can be obtained.

[0161] According to the results of cross-validation, the model is optimized and adjusted;

[0162] Deploy the trained and optimized model to the corresponding computing platform;

[0163] Through the S5 step, the heat resistance performance analysis model can be used to effectively extract useful information from a large amount of test data and generate an intuitive and comparable heat resistance performance index; it helps to quickly judge the quality of the cable and provide a scientific basis for subsequent qualification or failure judgment.

[0164] S6. Compare the heat resistance performance index with the preset heat resistance performance threshold. If the heat resistance performance index exceeds the preset heat resistance performance threshold, it means that the photovoltaic cables of this batch are qualified. If the heat resistance performance index does not exceed the preset heat resistance performance threshold, it means that the cables of this batch are unqualified.

[0165] The factors affecting the setting of the preset heat resistance performance threshold include:

[0166] Insulation layer and sheath materials: Different materials have different tolerance to high temperatures. Therefore, the insulation layer and sheath materials of the cable are key factors affecting the setting of the heat resistance threshold.

[0167] Conductor material: The conductivity and heat resistance of the conductor material will also affect the overall heat resistance of the cable; pure copper conductors have higher conductivity and better heat resistance, which can reduce the operating temperature rise and improve the current carrying capacity and heat resistance of the cable;

[0168] Cable specifications: The cross-sectional area, outer diameter and other dimensions of the cable will affect its heat dissipation performance and heat resistance. A larger cable cross-sectional area usually has better heat dissipation performance, which can reduce the operating temperature of the cable and thus improve heat resistance.

[0169] Cable structure design: Reasonable structure design can enhance the mechanical properties and heat resistance of the cable;

[0170] Working temperature range: PV systems are usually installed in outdoor environments and need to withstand harsh weather conditions such as high and low temperatures. Therefore, the setting of the heat resistance threshold needs to consider the heat resistance of the cable within the working temperature range.

[0171] Working environment conditions: Ultraviolet rays and ozone in outdoor environments have an aging effect on cable materials; therefore, the setting of the heat resistance threshold also needs to consider the changes in the heat resistance of the cable under long-term exposure to ultraviolet rays and ozone;

[0172] Cable service life: PV cables have a long service life and need to withstand long-term harsh environments. Therefore, the setting of the heat resistance threshold needs to consider the stability and reliability of the heat resistance of the cable in long-term operation.

[0173] Cable reliability requirements: As the core component of solar energy utilization, the stability and reliability of the photovoltaic system directly affect the efficiency and cost of solar power generation; therefore, the setting of the heat resistance performance threshold needs to meet the photovoltaic system's high reliability requirements for cables;

[0174] The S6 step can effectively control the quality of photovoltaic cables and ensure that they can maintain good performance under high temperature and other harsh environmental conditions, thereby ensuring the stable operation and long life of the entire photovoltaic system; in addition, this method also helps to continuously improve product quality and enhance the manufacturer's brand reputation.

[0175] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A photovoltaic cable for photovoltaic system control, characterized in that: It includes a conductor, an insulating sleeve and an outer sheath. The conductor is provided with three groups. Each group of the conductors is wrapped with a group of insulating sleeves. The three groups of conductors wrapped with insulating sleeves are twisted together. The outer sides of the three groups of insulating sleeves are wrapped with outer sheaths. The conductor is made of tinned copper conductor material, and the insulating sleeve and the outer sheath are both made of cross-linked polyethylene insulation material.

2. A method for detecting heat resistance of photovoltaic cables used for photovoltaic system control, characterized in that: The method comprises: Obtain parameter information of the photovoltaic cable to be tested; According to the parameter information of the photovoltaic cable to be tested, cable testing items are formulated, and the cable testing items include heat aging test, high temperature tensile test, high temperature cycle test and insulation resistance test; Intercept multiple groups of samples, classify and mark each group of samples according to the cable detection items, and integrate the marks of each group of samples to obtain a test sample set; According to the cable detection items, the marked samples in the test sample set are classified and tested to obtain a heat resistance detection data set; Inputting the heat resistance test data set into the pre-built heat resistance performance analysis model to obtain the heat resistance performance index; Compare the heat resistance performance index with the preset heat resistance performance threshold. If the heat resistance performance index exceeds the preset heat resistance performance threshold, it means that this batch of photovoltaic cables is qualified. If the heat resistance performance index does not exceed the preset heat resistance performance threshold, it means that this batch of cables is unqualified.

3. A method for detecting heat resistance of a photovoltaic cable for photovoltaic system control as claimed in claim 2, characterized in that: The method for obtaining the test sample set includes: Randomly select a sufficient number of samples from the batch of photovoltaic cables to be tested; According to the requirements of different testing items, each cable sample is cut into small sections of appropriate length; Clearly and durably mark each sample with the sample number, source batch number, and corresponding test items; Classify all labeled samples according to the test items they belong to; Package the classified samples to prevent damage during transportation; All samples are correctly assigned to the corresponding test items to form a test sample set.

4. A method for detecting heat resistance of a photovoltaic cable for photovoltaic system control as claimed in claim 2, characterized in that: The method of the thermal aging test comprises: Selecting a sample marked for heat aging test from the test sample set; Set the temperature of the aging box according to the actual working environment and expected life of the photovoltaic cable; The sample is fixedly installed in the aging box; Start the aging box, start heating and maintain the set temperature and humidity conditions; Record the time the test starts and set the test duration; Collect data on changes in sample performance during and after testing; Based on the collected data, the performance changes of the samples during the aging test are evaluated.

5. A method for detecting heat resistance of a photovoltaic cable for photovoltaic system control as claimed in claim 2, characterized in that: The method of high temperature tensile testing comprises: Select a specimen marked for elevated temperature tensile testing from the test specimen set; Set the temperature of the high temperature environment box according to the actual working environment and expected life of the photovoltaic cable; Fix one end of the sample to the fixture in the high temperature environment box, and connect the other end to the fixture of the tensile testing machine; Adjust the position and angle of the fixture so that the sample is in the correct stress state during the stretching process; Start the high temperature environment box and tensile testing machine, start heating and maintain the set temperature; When the temperature reaches the set value and stabilizes, the tensile test begins; During the stretching process, record the force and elongation curve of the sample, as well as the force and elongation when the sample breaks; At the end of the test, data on the tensile properties of the specimens were collected; Based on the collected data, the tensile properties of the samples under elevated temperature conditions were evaluated.

6. A method for detecting heat resistance of a photovoltaic cable for photovoltaic system control as claimed in claim 2, characterized in that: The high temperature cycle test method comprises: Selecting a sample marked as a high temperature cycle test from the test sample set; Set the temperature range of the high temperature cycle test chamber according to the actual working environment and expected life of the photovoltaic cable; Set the number of cycles of the high temperature cycle test chamber and the high temperature duration in each cycle; The sample is fixedly installed in a high temperature cycle test chamber; Start the high temperature cycle test chamber, start heating and maintain the set temperature range; In each cycle, when the temperature reaches the set high temperature value, the timing starts and is maintained for the set duration; After the high temperature duration is over, let the test chamber cool to room temperature and then start the next cycle; repeat the cycle process until the set number of cycles is reached; During the test, regularly check the specimens for changes in appearance and performance, and record all observed changes and measurements; Based on the collected data, the performance stability of the samples in high temperature cycle tests was evaluated.

7. A method for detecting heat resistance of a photovoltaic cable for photovoltaic system control as claimed in claim 2, characterized in that: The insulation resistance test method comprises: Select a sample marked for insulation resistance test from the test sample set; Set the test voltage of the insulation resistance tester according to the specifications and test standards of the photovoltaic cable; Set the test time to ensure that there is enough time for the measurement results to stabilize during the test; Use test electrodes and connecting wires to connect both ends of the sample to the insulation resistance tester; Start the insulation resistance tester and begin to apply the set test voltage; when the test time reaches the set value, record the final insulation resistance value displayed by the insulation resistance tester.

8. A method for detecting heat resistance of a photovoltaic cable for photovoltaic system control as claimed in claim 2, characterized in that: The method for constructing the heat resistance performance analysis model comprises: Collect historical thermal performance data; Clean, organize and normalize the collected data; Selecting a machine learning model as the basis of the heat resistance performance analysis model; the machine learning model includes a decision tree, a random forest, a support vector machine, and a neural network; Use the preprocessed data to train the model; The model was evaluated using the cross-validation method to test the generalization ability and stability of the model; According to the results of cross-validation, the model is optimized and adjusted; Deploy the trained and optimized model to the corresponding computing platform.

9. An electronic device for detecting heat resistance of photovoltaic cables used for photovoltaic system control, comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, characterized in that: When the computer program is executed by the processor, the steps in the method according to any one of claims 2 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps in the method according to any one of claims 2 to 7 are implemented.

Images