Simulation test device for cable thermal failure and test method thereof

Abstract

The application provides a simulation test device for cable thermal failure and a test method thereof. The simulation test device comprises a burning component, an insulation resistance measuring component, a monitoring component and an adjusting component. The burning component is used to provide a thermal failure environment with a fire source to a cable to be tested, and the first thermal failure parameter of the thermal failure environment can be adjusted through the burning component. The insulation resistance measuring component is used to connect the cable to be tested to measure the insulation resistance of the cable to be tested in the thermal failure environment. The monitoring component can at least acquire the temperature of a heat gathering area of the cable to be tested, wherein the heat gathering area is distributed close to the fire source. The adjusting component is used to carry the cable to be tested, and the second thermal failure parameter between the cable to be tested and the fire source can be adjusted through the adjusting component. The simulation test device can acquire the related parameters of the thermal failure of the cable in the fire environment, and provides a basis for further research on the thermal failure of the cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable testing, in particular to a simulation testing device for cable thermal failure and a testing method thereof. BACKGROUND

[0002] A cable is composed of single or multiple wires and an insulation layer, and can be used for transmitting power or information, and thus is widely used in power systems, information transmission systems and instrument systems. Especially for modern highly automated systems and devices, the safe and stable operation of the cable is crucial.

[0003] In actual application, the cable may be in a high-temperature environment, and the insulation layer changes under the action of high heat, resulting in a decrease in insulation performance and thermal failure, which leads to safety risks. In order to reduce the safety risks caused by cable thermal failure as much as possible, it is necessary to obtain the parameters of cable thermal failure.

[0004] However, when the cable is in a high-temperature environment, especially in a fire environment, the related parameters of thermal failure cannot be obtained, and thus further research on cable thermal failure cannot be carried out. SUMMARY

[0005] The present application provides a simulation testing device for determining cable thermal failure and a testing method thereof, which can obtain the related parameters of cable thermal failure in a fire environment, and provides a basis for further research on cable thermal failure in a fire environment.

[0006] In a first aspect, the present application provides a simulation testing device for cable thermal failure, comprising:

[0007] a burning component for providing a thermal failure environment with a fire source to a cable to be tested, and the first thermal failure parameter of the thermal failure environment can be adjusted through the burning component;

[0008] an insulation resistance measuring component for connecting the cable to be tested to measure the insulation resistance of the cable to be tested in the thermal failure environment;

[0009] a monitoring component capable of at least obtaining the temperature of a heat accumulation area of the cable to be tested, wherein the heat accumulation area is distributed close to the fire source;

[0010] an adjusting component for carrying the cable to be tested, and the adjusting component can adjust the second thermal failure parameter between the cable to be tested and the fire source.

[0011] In the technical solution of the present application, the combustion component can simulate a real fire environment, the cable to be tested can be subjected to thermal failure in the real fire environment, and more comprehensive thermal failure parameters of the cable can be obtained through the insulation resistance measuring component, the monitoring component and the adjusting component, thereby facilitating in-depth research on the cable in the real fire environment, so as to reduce the safety risk caused by thermal failure of the cable as much as possible.

[0012] In some embodiments of the present application, the combustion component comprises:

[0013] a fuel supply device for supplying fuel and capable of adjusting a first thermal failure parameter of the thermal failure environment through the fuel supply device;

[0014] a burner connected with the fuel supply device for generating a fire source to provide a thermal failure environment for the cable to be tested.

[0015] In some embodiments of the present application, the first thermal failure parameter comprises the intensity of the flame.

[0016] In some embodiments of the present application, the monitoring component comprises:

[0017] a thermocouple arranged at a heat gathering area of the cable to be tested to measure the temperature of the heat gathering area;

[0018] a temperature testing member electrically connected with the thermocouple for outputting the temperature measured by the thermocouple.

[0019] In some embodiments of the present application, the simulation test device further comprises a gas collecting hood, the burner is located in the gas collecting hood, and the gas collecting hood comprises a support and a hood body mounted on the support.

[0020] In some embodiments of the present application, the hood body is provided with an opening with an adjustable opening degree.

[0021] In some embodiments of the present application, the simulation test device further comprises a gas detection component, and the gas detection component comprises:

[0022] a gas collecting member arranged in the gas collecting hood for collecting the gas generated by the cable to be tested in the thermal failure environment;

[0023] a gas detection member connected with the gas collecting member for analyzing the composition and content of the gas collected by the gas collecting member.

[0024] In some embodiments of the present application, the second thermal failure parameter comprises the distance between the cable to be tested and the flame part of the fire source and the orientation of the cable to be tested relative to the fire source.

[0025] In some embodiments of the present application, the adjusting component comprises:

[0026] a carrying platform having oppositely arranged first and second surfaces, the first surface being used for carrying the cable to be tested;

[0027] a support rod, one end of the support rod being connected to the second surface of the carrying platform, the other end of the support rod being detachably connected to the support frame, the support rod being capable of adjusting the distance between the cable to be tested and the flame part of the fire source or the orientation of the cable to be tested relative to the fire source by the carrying platform used for carrying the cable to be tested.

[0028] In some embodiments of the present application, the support rod is a telescopic support rod.

[0029] In some embodiments of the present application, the adjusting component further comprises an adjusting panel arranged on one side of the carrying platform and connected to the support rod, for controlling the support rod to adjust the distance between the cable to be tested and the flame part of the fire source or the orientation of the cable to be tested relative to the fire source.

[0030] In some embodiments of the present application, the support rod is provided with a load sensor.

[0031] In some embodiments of the present application, the simulation test device further comprises a processing component electrically connected to the insulation resistance measuring component, the monitoring component and the adjusting component, for obtaining each critical value of thermal failure of the cable to be tested according to the first thermal failure parameter, the insulation resistance measured by the insulation resistance measuring component, the temperature obtained by the monitoring component and the second thermal failure parameter.

[0032] In a second aspect, the present application further provides a test method for cable thermal failure, the test method employing the simulation test device of any of the above-mentioned embodiments, the test method comprising the following steps:

[0033] providing a thermal failure environment having a fire source to the cable to be tested, and obtaining a first thermal failure parameter of the thermal failure environment;

[0034] obtaining the insulation resistance of the cable to be tested under the thermal failure environment;

[0035] obtaining the temperature of the heat gathering area of the cable to be tested, wherein the heat gathering area is distributed close to the fire source;

[0036] obtaining a second thermal failure parameter between the cable to be tested and the fire source;

[0037] According to the first thermal failure parameter, the insulation resistance, the temperature of the heat gathering area, and the second thermal failure parameter, each critical value of the thermal failure of the cable to be tested is obtained.

[0038] In the technical solution of the present application, the simulation test device can make the cable to be tested to have thermal failure in a real fire environment, and more comprehensive thermal failure parameters of the cable can be obtained, which is conducive to in-depth research on the cable in a real fire environment, so as to reduce the safety risk caused by thermal failure of the cable as much as possible.

[0039] In some embodiments of the present application, the test method further comprises the following steps:

[0040] The composition and content of the gas generated by the cable to be tested in the thermal failure environment are obtained.

[0041] In some embodiments of the present application, the test method further comprises the following steps:

[0042] The weight of the cable to be tested in the thermal failure environment is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] Figure 1 A structural schematic diagram of the simulation test device of some embodiments of the present application;

[0045] Figure 2 A structural schematic diagram of the simulation test device of some embodiments of the present application;

[0046] Figure 3 A structural schematic diagram of the adjusting component in the simulation test device of some embodiments of the present application;

[0047] Figure 4 A structural schematic diagram of the simulation test device of some embodiments of the present application;

[0048] Figure 5 A curve graph of the internal temperature and insulation resistance of the cable to be tested changing with time in some embodiments of the present application;

[0049] Figure 6(a) and 6(b) A curve graph of the internal temperature and time of the cable to be tested in different flame areas and different laying modes in some embodiments of the present application;

[0050] Figure 7(a) , 7(b)Fig. 7(a), 7(b), 7(c) are temperature-time curves of the cable outer surface and the tray inner and outer surface in different flame regions in some embodiments of the present application.

[0051] BRIEF DESCRIPTION OF DRAWINGS

[0052] 10 - simulation test device;

[0053] 11 - combustion component;

[0054] 111 - fuel supply system;

[0055] 112 - fuel flow control instrument;

[0056] 113 - burner;

[0057] 12 - insulation resistance measuring component;

[0058] 13 - monitoring component;

[0059] 131 - thermocouple;

[0060] 132 - temperature test piece;

[0061] 14 - gas collection cover;

[0062] 141 - support;

[0063] 142 - cover body;

[0064] 15 - gas detection component;

[0065] 151 - gas collection piece;

[0066] 152 - gas detection piece;

[0067] 16 - adjustment component;

[0068] 161 - bearing platform;

[0069] 162 - support rod;

[0070] 163 - adjustment panel;

[0071] 17 - processing component.

[0072] The specific embodiments of the present application have been shown by the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0073] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot be used to limit the protection scope of the present application.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the present specification and claims and the aforementioned description of the drawings are not intended to be all inclusive in terms of encompassing the full scope of the present application; the terms "comprising," "having," "including," and "containing" as used herein are meant to be interpreted in a non- limiting manner.

[0075] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0076] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0077] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0078] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0079] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0080] Cables are composed of single or multi-strand conductors and insulation layers, and can be used for transmitting power or information, etc., and thus are widely used in power systems, information transmission and instrument systems, etc. Especially for modern highly automated systems and equipment, the safe and stable operation of cables is crucial. In actual application process, cables sometimes are in high temperature environment, and the insulation layer changes under the action of high heat, so that the insulation performance decreases and thermal failure occurs, resulting in safety risks. In order to reduce the safety risks caused by cable thermal failure as much as possible, it is necessary to obtain the parameters of cable thermal failure. However, when the cable is in a high temperature environment, especially in a fire environment, the related parameters of thermal failure cannot be obtained, so that further research on cable thermal failure cannot be carried out.

[0081] In order to solve the problem that the related parameters of cable thermal failure cannot be obtained in the prior art, the present application provides a simulation test device for cable thermal failure, which can obtain the related parameters of cable thermal failure in a fire environment, and provides a basis for further research on cable thermal failure in a fire environment.

[0082] As shown in Figure 1 The simulation test device for cable thermal failure 10 provided by the present application includes a burning component 11, an insulation resistance measuring component 12, a monitoring component 13 and an adjusting component 16. The burning component 11 is used to provide a thermal failure environment with a fire source to the cable to be tested, and the first thermal failure parameter of the thermal failure environment can be adjusted through the burning component 11. The insulation resistance measuring component 12 is used to connect the cable to be tested to measure the insulation resistance of the cable to be tested in the thermal failure environment. The monitoring component 13 can at least obtain the temperature of the heat gathering area of the cable to be tested, wherein the heat gathering area is distributed close to the fire source. The adjusting component 16 is used to carry the cable to be tested, and the adjusting component 16 can adjust the second thermal failure parameter between the cable to be tested and the flame part of the fire source.

[0083] The local temperature of the cable can quickly rise in a fire environment, and the cable can be burned out due to the excessively high temperature, so that the cable loses its function, thereby causing the thermal failure of the cable. At present, the thermal failure parameters of the cable in the fire environment cannot be obtained, thereby hindering the further research on the thermal failure of the cable. In the embodiments of the present application, the burning component 11 can simulate the real fire environment, the cable to be tested can occur thermal failure in the real fire environment, and the more comprehensive thermal failure parameters of the cable can be obtained through the insulation resistance measuring component 12, the monitoring component 13 and the adjusting component 16, thereby facilitating the in-depth research on the cable in the real fire environment, so as to reduce the safety risk caused by the thermal failure of the cable as much as possible.

[0084] In some embodiments of the present application, the burning component 11 comprises a fuel supply device and a burner 113. The fuel supply device is not only used to provide fuel, but also can adjust the first thermal failure parameter of the thermal failure environment. The burner 113 is connected with the fuel supply device, and is used to generate a fire source to provide the first thermal failure parameter of the thermal failure environment to the cable to be tested, so that the fuel component can simulate a more real fire environment, and the thermal failure parameters obtained by the cable to be tested in the above fire environment are more accurate.

[0085] Please refer to Figure 2 The fuel supply device comprises a fuel supply system 111 and a fuel flow control instrument 112. The fuel flow control instrument 112 is connected with the fuel supply system 111 and the burner 113 respectively. The fuel supply system 111 can provide fuel, the fuel flow control instrument 112 can adjust the first thermal failure parameter of the thermal failure environment, and the burner 113 can ignite the fuel to generate a fire source.

[0086] In the above some embodiments, the fuel provided by the fuel supply device is combustible gas. Exemplarily, the combustible gas includes but is not limited to hydrogen (H2), carbon monoxide (CO), methane (CH4), ethane (C2H6), propane (C3H8), butane (C4H 10 ), ethylene (C2H4), propylene (C3H6), butylene (C4H8), acetylene (C2H2), propyne (C3H4) and butyne (C4H6).

[0087] In some embodiments of the present application, the first thermal failure parameter comprises the intensity of the flame. It can be understood that the fuel flow control instrument 112 can control the fuel flow, thereby controlling the intensity of the flame, that is, the greater the fuel flow, the stronger the intensity of the flame. In this way, different intensity fire environments can be provided for the cable to be tested, so as to obtain more comprehensive thermal failure parameters of the cable.

[0088] In the embodiments of the present application, the insulation resistance measuring component 12 can measure the insulation resistance between the internal conductors of the cable. When the cable to be measured is in a thermal failure environment, the insulation resistance measured by the insulation resistance measuring component 12 will change, and the changes in the insulation resistance can reflect the thermal failure time of the cable. Therefore, the safety risk can be reduced in response to the thermal failure time. The insulation resistance measuring component 12 is not specifically limited in the present application, as long as it can measure the insulation resistance between the internal conductors of the cable. For example, the insulation resistance measuring component 12 can be an insulation resistance tester.

[0089] Please continue to refer to Figure 2 As shown in the figure, in some embodiments of the present application, the monitoring component 13 includes a thermocouple 131 and a temperature testing element 132, wherein the thermocouple 131 is arranged at the heat gathering area of the cable to be measured to measure the temperature of the heat gathering area. The temperature testing element 132 is electrically connected with the thermocouple 131, and is used to output the temperature measured by the thermocouple 131.

[0090] Generally, the thermocouples 131 are arranged in an array at the heat gathering area of the cable to be measured, which is the area of the orthographic projection of the cable to be measured by the flame part of the fire source. The array of thermocouples 131 includes multiple groups of K-type patch thermocouples 131 and K-type armored thermocouples 131, which can simultaneously measure the temperature at positions such as the internal and external surfaces of the cable or the internal and external surfaces of the bridge (metal pipe). In addition, the arrangement position and manner of the thermocouples 131 can also be adjusted according to actual conditions.

[0091] The temperature testing element 132 is electrically connected with the thermocouple 131, and can thus collect the signal of the thermocouple 131, so as to output the real-time temperature of the heat gathering area of the cable to be measured.

[0092] In addition, in some other embodiments of the present application, the monitoring component 13 can also be a temperature sensor, a smoke sensor, a gas sensor, an image type fire detector, etc.

[0093] Please continue to refer to Figure 2 As shown in the figure, in some embodiments of the present application, the simulation test device 10 further includes a gas collecting cover 14, and the burner 113 is located in the gas collecting cover 14. The gas collecting cover 14 includes a support 141 and a cover body 142 mounted on the support 141.

[0094] In the above embodiments, the gas collecting cover 14 not only can maintain a high-temperature environment under fire, but also can collect the smoke generated by the fire.

[0095] In some embodiments of the present application, the cover body 142 is provided with an opening with an adjustable opening degree.

[0096] The adjustable opening of the opening can adjust the oxygen content in the gas collecting cover 14, and further adjust the intensity of the fire source. In addition, in some embodiments of the present application, the opening of the cover body 142 can also be completely closed, that is, in a closed condition, the thermal failure parameters of the cable are obtained.

[0097] In some embodiments, the material of the bracket 141 is a high-temperature-resistant stainless steel material, and the size of the gas collecting cover 14 formed by the bracket 141 can be designed according to actual conditions. The material of the cover body 142 can be a high-temperature-resistant fireproof glass material, which has the advantages of light weight and good smoke collecting effect.

[0098] Please continue to refer to Figure 2 As shown in FIG. 10, in some embodiments of the present application, the simulation test device 10 further comprises a gas detection component 15, which comprises a gas collection part 151 and a gas detection part 152. The gas collection part 151 is arranged in the gas collecting cover 14 and is used to collect the gas generated by the cable to be tested in the thermal failure environment. The gas detection part 152 is connected with the gas collection part 151 and is used to analyze the composition and content of the gas collected by the gas collection part 151.

[0099] In the above embodiment, the gas collection part 151 can collect the smoke in the simulation test device 10, and then the gas detection part 152 detects it to obtain the composition and content of the smoke. This helps to understand the composition and corresponding content of the gas generated by the cable in the thermal failure environment, so as to protect the physical health and personal safety of the maintenance personnel.

[0100] In some embodiments of the present application, the gas collection part 151 can be a conventional gas collector in the art, and the gas detection part 152 can also be a conventional gas detector in the art.

[0101] In some embodiments of the present application, the second thermal failure parameter includes the distance between the cable to be tested and the flame part of the fire source and the orientation of the cable to be tested relative to the fire source.

[0102] In the above embodiment, through the second thermal failure parameter, the installation of the cable can be facilitated, so as to reduce the thermal failure of the cable as much as possible.

[0103] Please continue to refer to Figure 3 As shown in FIG. 10, in some embodiments of the present application, the adjusting component 16 comprises a bearing platform 161 and a support rod 162. The bearing platform 161 has oppositely arranged first and second surfaces, and the first surface is used to bear the cable to be tested. One end of the support rod 162 is connected to the second surface of the bearing platform 161, and the other end thereof is detachably connected to the bracket 141. The support rod 162 can adjust the second thermal failure parameter between the cable to be tested and the fire source through the bearing platform 161 for bearing the cable to be tested.

[0104] In the above embodiment, the support rod 162 is detachably connected to the support 141, so that the support rod 162 can be connected along the axial direction of the support 141, thereby adjusting the distance between the cable under test and the flame part of the fire source or the orientation of the cable under test relative to the fire source by the bearing platform 161. By the second thermal failure parameter, the installation of the cable can be facilitated, thereby reducing the thermal failure of the cable as much as possible.

[0105] For example, if the distance between the cable under test and the flame part of the fire source is adjusted, the support rod 162 can be detached from the support 141, and then the support rod 162 is connected to the support 141 according to the preset distance between the cable under test and the flame part of the fire source. If the orientation of the cable under test relative to the fire source is adjusted, the support rod 162 can be connected to the support 141 at different positions.

[0106] In some embodiments of the present application, a conveyor belt can be installed on the bearing platform 161, and the cable under test can be adjusted to the required position for testing by the conveyor belt. In the embodiment, the bearing platform 161 and the conveyor belt can be made of high-temperature-resistant fireproof rubber material.

[0107] In some embodiments of the present application, the support rod 162 is a telescopic support rod 162.

[0108] In the above embodiment, the telescopic support rod 162 makes it easy to adjust the second thermal failure parameter. In addition, the above support rod 162 can be made of high-temperature-resistant stainless steel material, so that the structure is stable and the automatic telescoping effect is good.

[0109] Please continue to refer to Figure 3 In some embodiments of the present application, the adjusting member 16 further includes an adjusting panel 163, which is arranged on one side of the bearing platform 161 and connected with the support rod 162, and is used for controlling the support rod 162 to adjust the distance between the cable under test and the flame part of the fire source or the orientation of the cable under test relative to the fire source.

[0110] In the above embodiment, the second thermal failure parameter is input through the adjusting panel 163, so that the movement of the support rod 162 is controlled to adjust the second thermal failure parameter between the cable under test and the fire source. This makes it easier and more convenient to adjust the second thermal failure parameter.

[0111] In some embodiments of the present application, a guide rail can be arranged in the axial direction of the support 141, and one end of the support rod 162 can move along the guide rail, which is also helpful for adjusting the second thermal failure parameter.

[0112] Please continue to refer to Figure 3 In some embodiments of the present application, the support rod 162 is provided with a load cell 164.

[0113] In other embodiments of the present application, a weighing sensor 164 may also be provided on the carrying platform 161 .

[0114] In the above embodiment, the weight sensor 164 can be used to monitor the weight change of the cable during the thermal failure process, which is beneficial for further research on the thermal failure of the cable.

[0115] Please refer to Figure 4 As shown, in some embodiments of the present application, the simulation test device 10 also includes a processing component 17, which is electrically connected to the insulation resistance measuring component 12, the monitoring component 13 and the adjusting component 16, and is used to obtain the critical values ​​of thermal failure of the cable to be tested based on the first thermal failure parameter, the insulation resistance measured by the insulation resistance measuring component 12, the temperature obtained by the monitoring component 13 and the second thermal failure parameter.

[0116] In addition, the processing component 17 can also be electrically connected to the gas detection element 152 in the gas detection component 15.

[0117] In the above embodiment, the processing component 17 can integrate the obtained cable thermal failure parameters to more intuitively understand the correlation between the cable thermal failure parameters, thereby providing a basis for further research on cable thermal failure.

[0118] In some embodiments of the present application, the processing component 17 may be a computer.

[0119] In a second aspect, the present application further provides a method for testing thermal failure of a cable. The test method uses the simulation test device in any of the above embodiments, and the test method includes the following steps:

[0120] Providing a thermal failure environment with a fire source to the cable under test, and obtaining a first thermal failure parameter of the thermal failure environment;

[0121] Obtain the insulation resistance of the cable under test in a thermal failure environment;

[0122] Obtaining the temperature of a heat-collecting area of ​​the cable to be tested, wherein the heat-collecting area is close to a fire source;

[0123] Obtaining the second thermal failure parameter between the cable under test and the fire source;

[0124] According to the first thermal failure parameter, the insulation resistance, the temperature of the heat accumulation area and the second thermal failure parameter, critical values ​​of thermal failure of the cable to be tested are obtained.

[0125] Specifically, the fuel supply device in the fuel component supplies fuel to the burner, generating a fire source. The fire source provides a thermal failure environment for the cable under test, and a first thermal failure parameter is obtained through the fuel component. The insulation resistance measurement component then measures the insulation resistance of the cable under test in the thermal failure environment. The monitoring component measures the temperature of the heat-collecting area of ​​the cable under test, and the adjustment component measures the second thermal failure parameter between the cable under test and the fire source.

[0126] In the technical solution of the present application, a simulation test device can be used to make the cable under test thermally fail in a real fire environment, and more comprehensive cable thermal failure parameters can be obtained, which is conducive to in-depth research on cables in real fire environments, so as to minimize the safety risks caused by cable thermal failure.

[0127] In some embodiments of the present application, the testing method further includes the following steps:

[0128] Obtain the composition and content of the gas generated by the cable under test in a thermal failure environment.

[0129] In the above embodiment, this can be achieved by simulating the gas detection component in the test device.

[0130] In some embodiments of the present application, the testing method further includes the following steps:

[0131] Obtain the weight of the cable under test in a thermal failure environment.

[0132] In the above embodiment, this can be achieved by adjusting the weighing sensor in the component.

[0133] The following examples test different cable laying methods (bridge laying, metal laying and direct hanging laying). The test results are as follows: Figure 5 As shown in Figure 7.

[0134] Herein, the flame of the fire source may have a flame continuous zone, a flame intermittent zone and a smoke zone.

[0135] Reference Figure 5 As shown, Figure 5 This is a graph showing the changes in the internal temperature and insulation resistance of the cable to be tested over time in some embodiments of the present application. Figure 5 It can be seen that when the insulation resistance value of the cable to be tested drops by one order of magnitude, the cable experiences thermal failure. This point can be called the insulation failure point of the cable, that is, the corresponding time is called the insulation failure time of the cable, which is 370s. The internal temperature of the cable is called the insulation failure temperature of the cable, which is 288.4℃.

[0136] Reference Figure 6(a) and 6(b)As shown in FIG6(a) and FIG6(b), the internal temperature and time curves of the tested cable in different flame areas and different laying methods in some embodiments of the present application are shown. Figure 6(a) and 6(b) It can be seen that the temperature variation over time within the cable varies significantly in the continuous flame zone, intermittent flame zone, and smoke zone. Furthermore, the internal temperature rise curves of the cable differ significantly when laid in different ways within the same flame zone. These test results demonstrate the impact of different fire environments and laying methods on the thermal response of the cable.

[0137] Reference Figure 7(a) 、 7(b) As shown in Figures 7(a), 7(b) and 7(c), 7(a), 7(b) and 7(c) are temperature and time curves of the outer surface of the cable and the inner and outer surfaces of the bridge in various laying methods under different flame areas in some embodiments of the present application. Figure 7(a) 、 7(b) As shown in Figure 7(c), in each flame area, there are obvious differences in the temperature of the outer surface of the cable and the inner and outer surfaces of the bridge. This test result is of great significance in revealing the thermal response characteristics of the cable under different fire environments.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A simulation test device for cable thermal failure, characterized in that: include: A combustion component, used for providing a thermal failure environment with a fire source to the cable to be tested, and a first thermal failure parameter of the thermal failure environment can be adjusted by the combustion component; The combustion component includes a fuel supply device and a burner; an insulation resistance measuring component, configured to connect the cable to be tested to measure the insulation resistance of the cable to be tested under the thermal failure environment; A monitoring component capable of obtaining at least the temperature of a heat-collecting area of ​​the cable to be tested, wherein the heat-collecting area is located close to the fire source; an adjusting component, configured to carry the cable under test and capable of adjusting a second thermal failure parameter between the cable under test and the fire source, the second thermal failure parameter including a distance between the cable under test and a flame portion of the fire source and an orientation of the cable under test relative to the fire source; The simulation test device further includes an air collecting hood, the burner is located in the air collecting hood, and the air collecting hood includes a bracket and a hood body mounted on the bracket; The adjustment component includes a carrying platform and a support rod, the carrying platform has a first surface and a second surface arranged opposite to each other, the first surface is used to carry the cable under test; one end of the support rod is connected to the second surface of the carrying platform, and the other end of the support rod is detachably connected to the bracket. The support rod can adjust the distance between the cable under test and the flame position of the fire source or the orientation of the cable under test relative to the fire source through the carrying platform for carrying the cable under test. The support rod is connected to the bracket at different positions to adjust the orientation of the cable under test relative to the fire source.

2. The simulation test device according to claim 1, characterized in that: The combustion components include: a fuel supply device, configured to supply fuel and capable of adjusting a first thermal failure parameter of the thermal failure environment through the fuel supply device; A burner is connected to the fuel supply device and is used to generate a fire source to provide a thermal failure environment for the cable to be tested.

3. The simulation test device according to claim 1 or 2, characterized in that: The first thermal failure parameter includes the intensity of the flame.

4. The simulation test device according to claim 1, wherein: The monitoring component comprises: a thermocouple, disposed in a heat-collecting area of ​​the cable to be tested to measure the temperature of the heat-collecting area; The temperature testing piece is electrically connected to the thermocouple and is used to output the temperature measured by the thermocouple.

5. The simulation test device according to claim 1, wherein: The cover body is provided with an opening with an adjustable opening degree.

6. The simulation test device according to claim 1 or 5, characterized in that: The simulation test device further includes a gas detection component, which includes: A gas collecting component, disposed in the gas collecting hood, for collecting gas generated by the cable to be tested in the thermal failure environment; The gas detection component is connected to the gas collection component and is used to analyze the composition and content of the gas collected by the gas collection component.

7. The simulation test device according to claim 1, characterized in that: The support rod is a telescopic support rod.

8. The simulation test device according to claim 1, wherein: The adjustment component also includes an adjustment panel, which is arranged on a side of the carrying platform and connected to the support rod, and is used to control the support rod to adjust the distance between the cable under test and the flame position of the fire source or the orientation of the cable under test relative to the fire source.

9. The simulation test device according to any one of claims 7 to 8, characterized in that: The support rod is provided with a weighing sensor.

10. The simulation test device according to claim 1, wherein: The simulation test device also includes a processing component, which is electrically connected to the insulation resistance measuring component, the monitoring component and the adjusting component, and is used to obtain the critical values ​​of thermal failure of the cable to be tested based on the first thermal failure parameter, the insulation resistance measured by the insulation resistance measuring component, the temperature obtained by the monitoring component and the second thermal failure parameter.

11. A method for testing thermal failure of a cable, characterized in that: The test method adopts the simulation test device according to any one of claims 1 to 10, and the test method comprises the following steps: Providing a thermal failure environment with a fire source to the cable to be tested, and obtaining a first thermal failure parameter of the thermal failure environment; Obtaining the insulation resistance of the cable to be tested under the thermal failure environment; Acquiring the temperature of a heat-collecting area of ​​the cable to be tested, wherein the heat-collecting area is located close to the fire source; Obtaining a second thermal failure parameter between the cable to be tested and the fire source; Critical values ​​of thermal failure of the cable to be tested are obtained according to the first thermal failure parameter, the insulation resistance, the temperature of the heat collection area, and the second thermal failure parameter.

12. The testing method according to claim 11, characterized in that: The testing method further comprises the following steps: The composition and content of the gas generated by the cable under test in the thermal failure environment are obtained.

13. The testing method according to claim 11, characterized in that: The testing method further comprises the following steps: Obtain the weight of the cable under test in a thermal failure environment.

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