A cable current carrying capacity assessment device and method

Abstract

The application provides a cable current-carrying capacity evaluation device and method, which comprises a test tank, a solar cell circuit, a mechanism, a stress and strain detection system, a light source system, a current-carrying capacity evaluation system and an application environment calibration system; the test tank is connected with the current-carrying capacity evaluation system and the application environment calibration system; the solar cell circuit is installed on the mechanism in the test tank, the installation angle and height of the solar cell circuit and the tension of the substrate of the solar cell circuit are adjusted through the mechanism; a plurality of temperature measuring points are installed on the back of the solar cell circuit; flat cables are respectively installed at both ends of the solar cell circuit; flexible optical fiber sensors are coated on the surfaces of the flat cables to real-time transmit the stress and strain signals of the surfaces of the flat cables; the flat cables simulate on-orbit non-powered and powered working conditions; the light source system is installed in the test tank to irradiate the solar cell circuit; and the application can solve the problem of current-carrying capacity evaluation of the flat cable under the comprehensive environment of on-orbit vacuum and irradiation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable power transmission for space solar cell array, and particularly relates to a flat cable current-carrying capacity evaluation device and method. BACKGROUND

[0002] The solar cell array is a kind of semiconductor device for directly converting light energy into electric energy by photovoltaic effect. The solar cell array adopts a cable for power and signal transmission, and the transmission reliability directly determines the power supply capacity of the solar cell array. The cable current-carrying capacity has always been a difficult problem for the industry to accurately quantify and evaluate, mainly due to the environmental, temperature, humidity and working state of the cable surrounding products. Therefore, the current space solar cell array power transmission mainly relies on a large amount of redundant design to improve reliability, which greatly increases the number and weight of the cable, greatly reduces the effective launch load of the spacecraft, and seriously limits the development level of the solar cell array technology. At present, there is little report on the current-carrying capacity of the flat cable for some new solar cell arrays and flat cable products, so it is necessary to carry out related technical research.

[0003] After investigation, Liu Wenxiang et al. "CN104407247A Determination method and device for current-carrying capacity of two parallel direct-buried laid cables" proposed a determination method for the current-carrying capacity of two parallel direct-buried laid cables, and studied the cable temperature rise and current-carrying capacity between each other. Wang Chunsheng et al. "CN108037382A Power cable current-carrying capacity calculation method based on bisection method" established a power cable current-carrying capacity finite element calculation model according to the basic principles of heat transfer, and proposed a method for calculating the cable current-carrying capacity based on bisection method. Liang Yongchun et al. "CN101900773A Underground power cable current-carrying capacity online prediction system and method based on environmental factor monitoring and finite element" combines real-time measured temperature, wind speed, humidity and other data with finite element temperature field calculation to predict the current-carrying capacity of underground power cable. It can accurately predict the current-carrying capacity of underground power cable online.

[0004] In order to improve the design precision of the solar cell array power transmission cable current-carrying capacity in the ground development stage and improve the weight specific power of the solar cell array, the evaluation of the cable current-carrying capacity has become one of the necessary ways for the development of power supply products. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, and the present application provides a cable current-carrying capacity evaluation device and method to solve the problem of current-carrying capacity verification of the cable in the on-orbit application environment.

[0006] The technical scheme adopted by the present application is: a cable current-carrying capacity evaluation device, comprising: a test tank, a solar cell circuit, a mechanism, a stress and strain detection system, a light source system, a current-carrying capacity evaluation system and an application environment calibration system.

[0007] The test tank is connected with the current-carrying capacity evaluation system and the application environment calibration system.

[0008] The solar cell circuit is installed on the mechanism in the test tank, and the installation angle, height and tension of the substrate of the solar cell circuit are adjusted through the mechanism;

[0009] A plurality of temperature measuring points are installed on the back of the solar cell circuit to monitor the temperature of the solar cell circuit module in real time; flat cables are respectively installed at both ends of the solar cell circuit; the surface of the flat cable is coated with a flexible optical fiber sensor to transmit the stress and strain signals of the surface of the flat cable in real time; and the flat cable simulates the on-orbit non-powered and powered working conditions.

[0010] The light source system is installed in the test tank to illuminate the solar cell circuit.

[0011] The stress and strain detection system records different colors in real time through image acquisition, monitors the stress and strain of the surfaces of the flat cables at both ends of the solar cell circuit, and sends the stress and strain image data of the surfaces of the flat cables to a stress and strain analysis module.

[0012] The current-carrying capacity evaluation system comprises a stress and strain analysis module, a power supply module and a data analysis and processing module; the stress and strain analysis module analyzes the image data sent by the stress and strain detection system, obtains the stress and strain distribution and the maximum value of the surface of the flat cable, the power supply module adjusts the loop current of the flat cable and monitors the output power of the solar cell circuit; the data analysis and processing module analyzes the output power of the solar cell circuit, the temperature of the solar cell circuit module, the maximum value of the stress and strain of the flat cable, obtains the highest temperature, and evaluates the current-carrying capacity of the flat cable at different temperatures through data analysis and processing.

[0013] The application environment calibration system changes the output power of the solar cell circuit by adjusting the light source output of the light source system, monitors the temperature of the solar cell circuit module, provides the environmental temperature and its current-carrying coefficient for the current-carrying capacity evaluation system, and corrects and analyzes the current-carrying capacity and margin of the flat cable under different powered states.

[0014] Further, the vacuum degree of the body of the test tank reaches 10 -5 Pa or above, and the test tank has a temperature control system.

[0015] Further, the wavelength of the light source system covers 300nm-1100nm.

[0016] Further, the flat cable has a width-thickness ratio greater than 300.

[0017] Further, the flexible optical fiber sensor presents different color distribution cloud maps according to different stress and strain of the flat cable, and the strain monitoring capability covers 0-10000με.

[0018] Further, the stress and strain monitoring capability of the stress and strain detection system covers 0-10000με.

[0019] A cable current-carrying capacity evaluation method, comprising:

[0020] An external current-carrying capacity evaluation system and an application environment calibration system are connected to the test tank;

[0021] The solar cell circuit is installed on the mechanism in the test tank, a plurality of temperature measuring points are installed on the back of the solar cell circuit, and flat cables are installed at both ends of the solar cell circuit, and flexible optical fiber sensors are coated on the surface of the flat cables;

[0022] A light source system is installed in the test tank, and a stress and strain detection system is installed on the test tank;

[0023] The test tank is closed, the test tank is evacuated, and the set test index requirements are reached; the light source system is turned on to irradiate the solar cell circuit, simulate on-orbit irradiation, adjust the angle and height of the solar cell circuit through the mechanism, and perform radiation heating;

[0024] The application environment calibration system is turned on, the light source output of the light source system is adjusted, the output power of the solar cell circuit is changed, the initial working temperature is determined, the temperature of the solar cell circuit module is monitored, and the environmental temperature is provided for the current-carrying capacity evaluation system;

[0025] The current-carrying capacity evaluation system is turned on, the flat cable loop current is adjusted, and the output power of the solar cell circuit is monitored;

[0026] The stress and strain on the surface of the flat cable are monitored through the stress and strain detection system, stress and strain image information is obtained, the image information is transmitted to the stress and strain analysis module, the surface stress and strain distribution and the maximum surface stress and strain of the flat cable under different working conditions are obtained;

[0027] The output power of the solar cell circuit, the temperature of the solar cell circuit module, and the maximum value of the stress and strain of the flat cable are analyzed through the data analysis and processing module, the highest temperature of the flat cable is obtained by converting the stress and strain, the current-carrying capacity of the flat cable under different working conditions is evaluated through data analysis and processing, the current-carrying coefficient obtained by the application environment calibration system is combined, and the current-carrying capacity and margin of the flat cable under different power-on states are corrected and analyzed;

[0028] Close the light source system, and open the test tank when the temperature is reduced to room temperature.

[0029] Further, the opening current-carrying capacity evaluation system adjusts the flat cable loop current, and the energization time under each current condition is 10 min to 15 min.

[0030] Further, the vacuum degree of the body of the test tank reaches 10 -5 Pa, and the test tank has a temperature control system.

[0031] Further, the current-carrying capacity evaluation system comprises a stress and strain analysis module, a power supply module and a data analysis and processing module; the stress and strain analysis module analyzes image data sent by the stress and strain detection system, obtains the stress and strain distribution and the maximum value of the flat cable surface, the power supply module adjusts the flat cable loop current and monitors the solar cell circuit output power; the data analysis and processing module analyzes the solar cell circuit output power, the solar cell circuit module temperature, analyzes the maximum value of the flat cable stress and strain, obtains the highest temperature, and evaluates the current-carrying capacity of the flat cable under different temperatures through data analysis and processing.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] (1) The present application can solve the problem of current-carrying capacity evaluation of flat cables in a comprehensive environment of vacuum and irradiation in orbit, and test and verify the performance of the cables as soon as possible, so as to check the current-carrying capacity and margin of the flat cables and improve the reliability of the design of the power transmission line of the solar cell array.

[0034] (2) The cable current-carrying capacity evaluation device and method provided by the present application can provide protection for the high-reliability transmission application of the solar cell array cable, and can provide a broad application market for a series of spacecrafts such as low-orbit observation satellites, high-orbit satellites and Chinese space stations, improve the application level of the power transmission of the solar cell array in China, and make contributions to national defense. BRIEF DESCRIPTION OF DRAWINGS

[0035] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0036] Fig. 1 The structure diagram of the cable current-carrying capacity evaluation simulation device of the present application;

[0037] Fig. 2 The position schematic diagram of the solar cell circuit, the flat cable, the mechanism, the light source system and the current-carrying capacity evaluation system provided by the embodiment of the present application;

[0038] Fig. 3The solar cell circuit module, the busbar and the relative position relationship diagram (front, light-illuminated surface) of two sets of flat cables provided for the embodiment of the present application;

[0039] Fig. 4 The solar cell circuit module, the substrate, the cell circuit temperature measurement system and the relative position relationship diagram (back) of two sets of flat cables provided for the embodiment of the present application. DETAILED DESCRIPTION

[0040] The present application will be described in more detail with reference to the accompanying drawings, which show embodiments of the present application. The present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. In the drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity.

[0041] A cable current-carrying capacity evaluation device, comprising: a test tank 1, a solar cell circuit 2, a mechanism 4, a stress-strain detection system 5, a light source system 6, a current-carrying capacity evaluation system 7 and an application environment calibration system 8;

[0042] The test tank 1 is connected with the current-carrying capacity evaluation system 7 and the application environment calibration system 8;

[0043] The solar cell circuit 2 is installed on the mechanism 4 in the test tank 1, and the installation angle, height and tension of the substrate 2-3 of the solar cell circuit 2 are adjusted by the mechanism;

[0044] A plurality of temperature measurement points are installed on the back of the solar cell circuit 2 to monitor the temperature of the solar cell circuit module 2-1 in real time; flat cables 3 are respectively installed at both ends of the solar cell circuit 2; the surface of the flat cable 3 is coated with a flexible optical fiber sensor to transmit the stress-strain signal of the surface of the flat cable 3 in real time; the flat cable 3 simulates the on-orbit non-powered and powered working conditions;

[0045] The light source system 6 is installed in the test tank 1 to illuminate the solar cell circuit 2;

[0046] The stress-strain detection system 5 has an image recording function, and records a plurality of colors such as red, orange, yellow, green and purple in real time to monitor the stress-strain of the surface of the flat cable at both ends of the solar cell circuit 2, and the stress-strain monitoring capability covers 0-10000με; the stress-strain image data of the surface of the flat cable 3 is sent to a stress-strain analysis module 7-1;

[0047] The current-carrying capacity evaluation system 7 comprises a stress-strain analysis module 7-1, a power supply module 7-2 and a data analysis processing module 7-3;

[0048] The stress and strain analysis module 7-1 analyzes the image data sent by the stress and strain detection system 5, obtains the stress and strain distribution and the maximum value on the surface of the flat cable 3, and provides the power module 7-2 with the flat cable loop current for adjusting the output power of the solar cell circuit 2.

[0049] The data analysis and processing module 7-3 analyzes the output power of the solar cell circuit, the temperature of the solar cell circuit module, the maximum value of the stress and strain of the flat cable, and obtains the highest temperature, and evaluates the current carrying capacity of the flat cable at different temperatures through data analysis and processing.

[0050] The application environment calibration system 8 adjusts the light source output of the light source system 6, changes the output power of the solar cell circuit, monitors the temperature of the solar cell circuit module, and provides the current carrying capacity evaluation system 7 with the environmental temperature and its current carrying coefficient, and corrects the analysis of the current carrying capacity and the margin of the flat cable under different power-on states.

[0051] The body vacuum degree of the test tank 1 reaches 10 -5 Pa, and the test tank 1 has a temperature control system.

[0052] The wavelength of the light source can cover 300nm-1100nm.

[0053] The width-thickness ratio of the flat cable 3 is greater than 300, the flat cable surface is coated with a flexible optical fiber sensor, and different color distribution cloud maps are presented according to different stress and strain of the flat cable, and the strain monitoring capacity covers 0-10000με.

[0054] The preferred embodiments of the present application will be further described in detail.

[0055] Embodiment:

[0056] As Figs. 1-4 shown, the present application provides a cable current carrying capacity evaluation device, which comprises: a test tank 1, a solar cell circuit 2, a battery circuit temperature measurement system, a first mechanism 4-1 and a second mechanism 4-2, a light source system 6, a current carrying capacity evaluation system 7, a first stress and strain detection system 5-1 and a second stress and strain detection system 5-2, and an application environment calibration system 8.

[0057] The solar cell circuit 2 is composed of a solar cell circuit module 2-1, a bus bar 2-2 and a substrate 2-3;

[0058] The current carrying capacity of the first flat cable 3-1 and the second flat cable 3-2 in the thermal vacuum, irradiation and other comprehensive environment is evaluated through the light source system 6, the current carrying capacity evaluation system 7, the first stress and strain detection system 5-1 and the second stress and strain detection system 5-2 and the application environment calibration system 8.

[0059] A cable current-carrying capacity evaluation method, comprising the following steps:

[0060] Step one, connect the current-carrying capacity evaluation system 7 and the application environment calibration system 8 to the test tank 1;

[0061] Step two, install the solar cell circuit 2 on the mechanism 4 in the test tank 1; install several temperature measuring points on the back of the solar cell circuit 2; install flat cables 3 on both ends of the solar cell circuit 2, and coat flexible optical fiber sensors on the surface of the flat cables 3;

[0062] Step three, install the light source system 6 in the test tank 1, and install the stress and strain detection system 5 on the test tank 1;

[0063] Step four, close the test tank 1, vacuumize the test tank 1, and reach the set test index requirements; turn on the light source system 6 to irradiate the solar cell circuit, simulate on-orbit irradiation, adjust the angle and height of the solar cell circuit through the mechanism, and perform radiation heating;

[0064] Turn on the application environment calibration system 8, adjust the light source output of the light source system 6, change the output power of the solar cell circuit 2, determine the initial working temperature, monitor the temperature of the solar cell circuit module, and provide the environmental temperature for the current-carrying capacity evaluation system 7;

[0065] Turn on the current-carrying capacity evaluation system 7, adjust the flat cable loop current by the power supply module 7-2, turn on the power for 10-15 minutes under each current working condition, and monitor the output power of the solar cell circuit.

[0066] The stress and strain detection system 5 monitors the stress and strain on the surface of the flat cable, obtains stress and strain image information, transmits the image information to the stress and strain analysis module 7-1, and obtains the surface stress and strain distribution and the maximum surface stress and strain of the flat cable 3 under different working conditions;

[0067] The data analysis and processing module 7-3 analyzes the output power of the solar cell circuit, the temperature of the solar cell circuit module, the maximum value of the stress and strain of the flat cable, converts the stress and strain to obtain the highest temperature, evaluates the current-carrying capacity of the flat cable under different working conditions through data analysis and processing, and corrects the current-carrying capacity and margin of the flat cable under different power-on states in combination with the current-carrying coefficient obtained by the application environment calibration system 8.

[0068] Step five, turn off the light source system, the current-carrying capacity evaluation system, and the application environment calibration system, open the test tank when the temperature decreases to room temperature, and check the flat cable.

[0069] A cable current-carrying capacity evaluation simulation method, the specific working steps are as follows:

[0070] Step one, the test tank 1 has a vacuum system, which can reach 10 -5 Pa's ability. The test tank 1 is connected to the current-carrying capacity evaluation system 7 and the application environment calibration system 8;

[0071] Step two, install the solar cell circuit 2 on the first mechanism 4-1 and the second mechanism 4-2 in the test tank 1, which can adjust the installation angle, height of the solar cell circuit 2 and the tension of the substrate 2-3 of the solar cell circuit 2; The back of the solar cell circuit module 2-1 is installed with four temperature measuring points, namely the first temperature measuring point 2-4, the second temperature measuring point 2-5, the third temperature measuring point 2-6 and the fourth temperature measuring point 2-7, which can monitor the temperature of the solar cell circuit module 2-1 in real time; The solar cell circuit 2 is respectively installed with the first flat cable 3-1 and the second flat cable 3-2, and the surface of the first flat cable 3-1 and the second flat cable 3-2 is coated with the first flexible optical fiber sensor 3-3 and the second flexible optical fiber sensor 3-4, which can transmit the stress and strain signals on the surface of the first flat cable 3-1 and the second flat cable 3-2 in real time, and display various colors such as red, orange, yellow, green and purple according to the different stress and strain distribution, and the strain monitoring capacity covers 0-10000με; The width-thickness ratio of the flat cable is greater than 300, which can realize 1-100 different current transmission;

[0072] Step three, install the light source system 6 in the test tank 1 to irradiate the solar cell circuit 2;

[0073] Step four, close the test tank 1, vacuumize, and reach the test index requirement. Open the light source system 6 to irradiate the solar cell circuit 2, simulate the on-orbit irradiation, adjust the angle and height of the solar cell circuit 2 through the first mechanism 4-1 and the second mechanism 4-2, and perform radiation heating;

[0074] Open the application environment calibration system 8, adjust the light source output of the light source system 6, change the output power of the solar cell circuit 2, and determine the initial working temperature of the solar cell circuit 2 according to the telemetry temperature experience data in different orbit environments such as LEO, GEO and MEO, such as 100℃ in a certain LEO orbit, monitor the solar cell circuit module temperature T1, and provide the environmental temperature for the current-carrying capacity evaluation system 7;

[0075] Open the current-carrying capacity evaluation system 7, adjust the loop current I1 and I2 of the flat cable 3-1 and the flat cable 3-2 through the power supply module 7-2, the range is 1A-20A, the power-on time is 10min-15min under each current working condition, and the output power of the solar cell circuit 2 is monitored;

[0076] The first flat cable 3-1 and the second flat cable 3-2 are monitored by the first stress-strain detection system 5-1 and the second stress-strain detection system 5-2 through the first flexible optical fiber sensor 3-3 and the second flexible optical fiber sensor 3-4, respectively, and the effective monitoring area is not less than 0.5m 2 The surface stress-strain image information of the first flat cable 3-1 and the second flat cable 3-2 is obtained by non-contact strain detection, and the error of large-area detection is less than 0.5%, and the image information is transmitted to the stress-strain analysis module 7-1 to obtain the surface stress-strain distribution and maximum value of the flat cable 3 under different working conditions;

[0077] The data analysis processing module 7-3 analyzes the solar cell circuit output power, the solar cell circuit module temperature, analyzes the maximum value of the flat cable stress-strain, converts the stress-strain to obtain the highest temperature;

[0078] The temperature gradient change of the temperature field, the highest temperature T2 of the first flat cable 3-1, the highest temperature T3 of the second flat cable 3-2 are comprehensively judged, and the current-carrying coefficient obtained by the application environment calibration system 8 is combined to correct and analyze the current-carrying capacity and margin of the flat cable under different power-on states, and finally determine the current-carrying capacity m1, m2 and the margin n1, n2 of the first flat cable 3-1 and the second flat cable 3-2 under different current working conditions;

[0079] The specific calculation formula is as follows:

[0080]

[0081]

[0082]

[0083]

[0084] Wherein, T0 is the allowable temperature of the flat cable, ℃; T1 is the ambient temperature (solar cell circuit module temperature), ℃; T2 is the highest temperature of the flat cable 3-1 monitored, ℃; T3 is the highest temperature of the flat cable 3-2 monitored, ℃; λ1 is the current-carrying coefficient of the flat cable 3-1; λ2 is the current-carrying coefficient of the flat cable 3-2;

[0085] Step five, turn off the light source system 6, when the current-carrying capacity evaluation system 7 and the application environment calibration system 8 are reduced to room temperature, open the test tank 1, and check the first flat cable 3-1 and the second flat cable 3-2.

[0086] The experiment has proved that the present application simulates the vacuum degree, the space on-orbit temperature by the light source system 6 to the solar cell circuit 2, the test tank 1, simulates the on-orbit light and the power output working condition of the solar cell circuit 2 and the flat cable, determines the surface stress and strain condition and the temperature condition of the flat cable under the on-orbit power-on and power-off working condition, evaluates the current-carrying capacity of the flat cable under the comprehensive environment such as the thermal vacuum and the irradiation by the light source system 6, the current-carrying capacity evaluation system 7 and the application environment calibration system 8.

[0087] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and it is intended to encompass all changes and modifications that fall within the meaning and scope of equivalents of the claims. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0088] The parts of the present application not described in detail are known to a person skilled in the art.

Claims

1. A cable ampacity assessment device, characterized by, Comprising: Test tank (1), solar cell circuit (2), mechanism (4), stress and strain detection system (5), light source system (6), current carrying capacity evaluation system (7) and application environment calibration system (8); The test tank (1) is connected with the current carrying capacity evaluation system (7) and the application environment calibration system (8); The solar cell circuit (2) is installed on the mechanism (4) in the test tank (1), and the installation angle, height and the tension of the substrate (2-3) of the solar cell circuit (2) are adjusted through the mechanism (4); A plurality of temperature measuring points are installed on the back of the solar cell circuit (2) to monitor the temperature of the solar cell circuit module (2-1) in real time; flat cables (3) are respectively installed at both ends of the solar cell circuit (2); the surface of the flat cable (3) is coated with a flexible optical fiber sensor to transmit the stress and strain signals of the surface of the flat cable (3) in real time; the flat cable (3) simulates the on-orbit non-powered and powered working conditions; The test tank (1) is installed with a light source system (6) to illuminate the solar cell circuit (2); The stress and strain detection system (5) records different colors in real time through image acquisition, respectively monitors the stress and strain of the surface of the flat cables at both ends of the solar cell circuit (2), and sends the image data of the surface stress and strain of the flat cable (3) to the stress and strain analysis module (7-1); The current carrying capacity evaluation system (7) comprises a stress and strain analysis module (7-1), a power supply module (7-2) and a data analysis and processing module (7-3); the stress and strain analysis module (7-1) analyzes the image data sent by the stress and strain detection system (5), obtains the stress and strain distribution and the maximum value of the surface of the flat cable (3), the power supply module (7-2) adjusts the loop current of the flat cable and monitors the output power of the solar cell circuit (2); the data analysis and processing module (7-3) analyzes the output power of the solar cell circuit (2), the temperature of the solar cell circuit module (2-1), the maximum value of the stress and strain of the flat cable (3), and obtains the highest temperature, and evaluates the current carrying capacity of the flat cable under different temperatures through data analysis and processing; The application environment calibration system (8) adjusts the light source output of the light source system (6), changes the output power of the solar cell circuit (2), monitors the temperature of the solar cell circuit module (2-1), provides the environmental temperature and its current carrying coefficient for the current carrying capacity evaluation system (7), and corrects and analyzes the current carrying capacity and margin of the flat cable under different powered states; The body vacuum degree of the test tank (1) reaches 10 -5 Pa or above, the test tank (1) has a temperature control system; The wavelength of the light source system (6) covers 300nm-1100nm; The width-thickness ratio of the flat cable (3) is greater than 300.

2. The cable ampacity assessment device of claim 1, wherein, The flexible optical fiber sensor presents different color distribution cloud maps according to different stress and strain of the flat cable, and the strain monitoring capacity covers 0-10000με.

3. The apparatus of claim 1, wherein, The stress and strain monitoring capacity of the stress and strain detection system (5) covers 0-10000με.

4. A method of evaluating the current carrying capacity of a cable, characterized by, Comprising: The test tank (1) is connected with the current carrying capacity evaluation system (7) and the application environment calibration system (8); The mechanism (4) is used to install the solar cell circuit (2) into the test tank (1); a plurality of temperature measuring points are installed on the back of the solar cell circuit (2); the flat cable (3) is installed at both ends of the solar cell circuit (2), and the flexible optical fiber sensor is coated on the surface of the flat cable (3); The light source system (6) is installed in the test tank (1), and the stress and strain detection system (5) is installed on the test tank (1); The test tank (1) is closed, the test tank (1) is vacuumized, and the set test index requirement is reached; the light source system (6) is opened, the solar cell circuit is irradiated, the on-orbit irradiation is simulated, the angle and height of the solar cell circuit are adjusted by the mechanism, and radiation heating is carried out; The application environment calibration system (8) is opened, the light source output of the light source system (6) is adjusted, the output power of the solar cell circuit (2) is changed, the initial working temperature is determined, the solar cell circuit module temperature is monitored, and the environmental temperature is provided for the current-carrying capacity evaluation system (7); The current-carrying capacity evaluation system (7) is opened, the flat cable loop current is adjusted, and the output power of the solar cell circuit (2) is monitored; The stress and strain detection system (5) is used to monitor the stress and strain on the surface of the flat cable (3), obtain the stress and strain image information, and transmit the image information to the stress and strain analysis module (7-1) to obtain the surface stress and strain distribution and the maximum surface stress and strain of the flat cable (3) under different working conditions; The data analysis and processing module (7-3) is used to analyze the output power of the solar cell circuit, the temperature of the solar cell circuit module, the maximum value of the stress and strain of the flat cable, convert the stress and strain, obtain the highest temperature of the flat cable (3), evaluate the current-carrying capacity of the flat cable (3) under different working conditions through data analysis and processing, and correct and analyze the current-carrying capacity and margin of the flat cable (3) under different current states in combination with the current-carrying coefficient obtained by the application environment calibration system (8); The light source system (6) is closed, and the test tank (1) is opened when the temperature is reduced to room temperature; The current-carrying capacity evaluation system (7) is opened, the flat cable loop current is adjusted, and the current time under each current working condition is 10min-15min; The body vacuum of the test tank (1) reaches 10 -5 Pa or more, and the test tank (1) has a temperature control system.

5. The method of claim 4, wherein, The current-carrying capacity evaluation system (7) includes the stress and strain analysis module (7-1), the power supply module (7-2) and the data analysis and processing module (7-3); the stress and strain analysis module (7-1) analyzes the image data sent by the stress and strain detection system (5), obtains the surface stress and strain distribution and the maximum value of the flat cable (3), the power supply module (7-2) adjusts the flat cable loop current and monitors the output power of the solar cell circuit (2); and the data analysis and processing module (7-3) analyzes the output power of the solar cell circuit (2), the temperature of the solar cell circuit module (2-1) and the maximum value of the stress and strain of the flat cable (3), obtains the highest temperature, and evaluates the current-carrying capacity of the flat cable under different temperatures through data analysis and processing.

Images