CN114563638A - Simulation test device for cable thermal failure and test method thereof - Google Patents
Simulation test device for cable thermal failure and test method thereof Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- Engineering & Computer Science (AREA)
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Abstract
The application provides a simulation test device for cable thermal failure and a test method thereof. The combustion component is used for providing a thermal failure environment with a fire source for the cable to be tested, and a first thermal failure parameter of the thermal failure environment can be adjusted through the combustion component. The insulation resistance measuring component is used for connecting the cable to be measured so as to measure the insulation resistance of the cable to be measured in a thermal failure environment. The monitoring component can at least acquire the temperature of a heat accumulation area of the cable to be detected, wherein the heat accumulation area is distributed close to a fire source. The adjusting component is used for bearing the cable to be tested, and the adjusting component can adjust a second thermal failure parameter between the cable to be tested and the fire source. The simulation testing device can acquire related parameters of thermal failure of the cable in a fire environment, and provides a basis for further research on the thermal failure of the cable.
Description
Technical Field
The 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
Cables are composed of single or multi-strand wires and an insulating layer, and are used for transmitting electric power, information, and the like, and thus are widely used in systems such as electric power systems, information transmission, and meters. Especially for modern highly automated systems and devices, safe and stable operation of the cables is of great importance.
In the practical application process of the cable, the cable is sometimes in a high-temperature environment, and the insulating layer of the cable is changed under the action of high heat, so that the insulating property is reduced, thermal failure is generated, and safety risks are caused. In order to reduce the safety risk caused by the thermal failure of the cable as much as possible, it is therefore necessary to obtain parameters of the thermal failure of the cable.
However, when the cable is in a high-temperature environment, especially in a fire environment, the relevant parameters of the thermal failure of the cable cannot be obtained, so that the thermal failure of the cable cannot be further studied.
Disclosure of Invention
The application provides a simulation test device for measuring cable thermal failure and a test method thereof, which can obtain related parameters of the cable thermal failure in a fire environment and provide a basis for further research on the cable thermal failure in the fire environment.
In a first aspect, the present application provides a simulation test apparatus for thermal failure of a cable, comprising:
The combustion component is used for providing a thermal failure environment with a fire source for the cable to be tested, and a first thermal failure parameter of the thermal failure environment can be adjusted through the combustion component;
the insulation resistance measuring component is used for connecting the cable to be measured so as to measure the insulation resistance of the cable to be measured in the thermal failure environment;
the monitoring component at least can acquire the temperature of a heat accumulation area of the cable to be detected, wherein the heat accumulation area is distributed close to the fire source;
an adjustment component for carrying the cable under test and capable of adjusting a second thermal failure parameter between the cable under test and the fire source.
According to the technical scheme, the real fire environment can be simulated through the combustion component, the cable to be tested can be thermally disabled in the real fire environment, and more comprehensive cable thermal failure parameters can be obtained through the insulation resistance measuring component, the monitoring component and the adjusting component, so that deep research on the cable in the real fire environment is facilitated, and the safety risk caused by thermal failure of the cable is reduced as much as possible.
In some embodiments of the present application, the combustion component comprises:
a fuel supply for providing fuel and capable of adjusting a first thermal failure parameter of the thermal failure environment via the fuel supply;
A burner connected to the fuel supply for generating a fire source to provide a thermal failure environment to the cable under test.
In some embodiments of the present application, the first thermal failure parameter comprises an intensity of a flame.
In some embodiments of the present application, the monitoring component comprises:
the thermocouple is arranged in a heat accumulation area of the cable to be measured so as to measure the temperature of the heat accumulation area;
and the temperature testing piece is electrically connected with the thermocouple and used for outputting the temperature measured by the thermocouple.
In some embodiments of the present application, the simulation testing device further comprises a gas collection enclosure, the burner being located within the gas collection enclosure, the gas collection enclosure comprising a support and an enclosure body mounted to the support.
In some embodiments of the present application, the cover body is provided with an opening with an adjustable opening degree.
In some embodiments of the present application, the simulation test apparatus further comprises a gas detection part, the gas detection part comprising:
the gas collecting piece is arranged in the gas collecting hood and used for collecting gas generated by the cable to be tested in the thermal failure environment;
and the gas detection part is connected with the gas collection part and is used for analyzing the components and the content of the gas collected by the gas collection part.
In some embodiments of the present application, the second thermal failure parameter includes a distance between the cable under test and a flame location of the fire source and an orientation of the cable under test relative to the fire source.
In some embodiments of the present application, the adjustment member comprises:
the bearing platform is provided with a first surface and a second surface which are arranged oppositely, and the first surface is used for bearing the cable to be tested;
the one end of bracing piece connect in load-bearing platform's second surface, the other end detachable of bracing piece connect in the support, the bracing piece can be through being used for bearing the cable that awaits measuring load-bearing platform adjusts the cable that awaits measuring with the distance between the flame position of flame source or the cable that awaits measuring for the position of flame source.
In some embodiments of the present application, the support bar is a retractable support bar.
In some embodiments of the present application, the adjusting component further includes an adjusting panel, the adjusting panel is disposed on a side surface of the bearing platform, and is connected to the supporting rod, so as to control the supporting rod to adjust a distance between the cable to be tested and the flame portion of the fire source or an orientation of the cable to be tested relative to the fire source.
In some embodiments of the present application, the support bar is provided with a load cell.
In some embodiments of the present application, the simulation testing apparatus further includes a processing component, and the processing component is electrically connected to the insulation resistance measuring component, the monitoring component and the adjusting component, and is configured to obtain each critical value of the 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.
In a second aspect, the present application further provides a testing method for cable thermal failure, where the testing method uses the simulation testing apparatus described in any of the above embodiments, and the testing method includes the following steps:
providing a thermal failure environment with a fire source for a cable to be tested, and acquiring a first thermal failure parameter of the thermal failure environment;
acquiring the insulation resistance of the cable to be tested in the thermal failure environment;
acquiring the temperature of a heat accumulation area of the cable to be detected, wherein the heat accumulation area is distributed close to the fire source;
acquiring a second thermal failure parameter between the cable to be tested and the fire source;
And obtaining each critical value of the thermal failure of the cable to be tested according to the first thermal failure parameter, the insulation resistance, the temperature of the heat accumulation area and the second thermal failure parameter.
In the technical scheme of this application, can make the cable that awaits measuring take place thermal failure in real fire environment through emulation testing arrangement, and still can obtain more comprehensive cable thermal failure parameter, and then be favorable to carrying out deep research to the cable under real fire environment to reduce cable thermal failure as far as and lead to the safety risk.
In some embodiments of the present application, the testing method further comprises the steps of:
and acquiring the components and the content of the gas generated by the cable to be tested in the thermal failure environment.
In some embodiments of the present application, the testing method further comprises the steps of:
and acquiring the weight of the cable to be tested in a thermal failure environment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of a simulation test apparatus according to some embodiments of the present application;
FIG. 2 is a schematic diagram of a simulation test apparatus according to some embodiments of the present application;
FIG. 3 is a schematic diagram of an adjustment component of a simulation testing apparatus according to some embodiments of the present application;
FIG. 4 is a schematic diagram of a simulation test apparatus according to some embodiments of the present application;
FIG. 5 is a graph of temperature and insulation resistance inside a cable under test over time in some embodiments of the present application;
FIGS. 6(a) and 6(b) are graphs of internal temperature versus time for cables under test in different flame zones and different laying patterns according to some embodiments of the present disclosure;
fig. 7(a), 7(b), and 7(c) are graphs of temperature versus time for various applications of the outer cable surface and the inner and outer bridge surfaces in different flame zones, in some embodiments of the present application.
Description of reference numerals:
10-a simulation test device;
11-a combustion component;
111-fuel supply system;
112-fuel flow control instrument;
113-a burner;
12-an insulation resistance measuring part;
13-a monitoring component;
131-a thermocouple;
132-temperature test piece;
14-a gas-collecting hood;
141-a bracket;
142-a cover;
15-a gas detection component;
151-gas collection member;
152-a gas detection member;
16-an adjustment member;
161-a load-bearing platform;
162-a support bar;
163-adjusting panel;
17-processing the component.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.
Unless defined otherwise, 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 application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
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 appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).
In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
Cables are composed of single or multi-strand wires and an insulating layer, and are used for transmitting electric power, information, and the like, and thus are widely used in systems such as electric power systems, information transmission, and meters. Especially for modern highly automated systems and devices, safe and stable operation of the cables is of great importance. In the practical application process of the cable, the cable is sometimes in a high-temperature environment, and the insulating layer of the cable is changed under the action of high heat, so that the insulating property is reduced, thermal failure is generated, and safety risks are caused. In order to reduce the safety risk caused by the thermal failure of the cable as much as possible, it is therefore necessary to obtain parameters of the thermal failure of the cable. However, when the cable is in a high-temperature environment, especially in a fire environment, the relevant parameters of the thermal failure of the cable cannot be obtained, so that the thermal failure of the cable cannot be further studied.
For solving the problem that the related parameters of the thermal failure of the cable cannot be acquired in a fire disaster in the prior art, the simulation testing device for the thermal failure of the cable is provided, can acquire the related parameters of the thermal failure of the cable in the fire disaster environment, and provides a basis for further research on the thermal failure of the cable in the fire disaster environment.
As shown in FIG. 1, the simulation test device 10 for cable thermal failure provided by the application comprises a combustion component 11, an insulation resistance measurement component 12, a monitoring component 13 and an adjusting component 16. The combustion part 11 is used for providing a thermal failure environment with a fire source for the cable to be tested, and a first thermal failure parameter of the thermal failure environment can be adjusted through the combustion part 11. The insulation resistance measuring part 12 is used for connecting a cable to be measured to measure the insulation resistance of the cable to be measured in a thermal failure environment. The monitoring part 13 is capable of acquiring at least the temperature of a heat accumulation area of the cable to be measured, wherein the heat accumulation area is distributed close to the fire source. The adjustment component 16 is configured to carry a cable under test, and the adjustment component 16 is configured to adjust a second thermal failure parameter between the cable under test and a flame location of the fire source.
In a fire environment, the local temperature of the cable can rise rapidly, and the cable can be burnt out due to overhigh temperature, so that the cable is out of action, and the thermal failure of the cable is caused. At present, the cable is thermally failed in a fire environment, and the thermal failure parameters of the cable cannot be obtained, so that the further research on the thermal failure of the cable is hindered. In the embodiment of the application, the combustion part 11 can simulate a real fire environment, the cable to be tested can be thermally disabled in the real fire environment, and more comprehensive cable thermal failure parameters can be obtained through the insulation resistance measuring part 12, the monitoring part 13 and the adjusting part 16, so that the deep research on the cable in the real fire environment is facilitated, and the safety risk caused by the thermal failure of the cable is reduced as much as possible.
In some embodiments of the present application, the combustion part 11 includes a fuel supply and a burner 113. Wherein the fuel supply is not only used for supplying fuel, but also for adjusting a first thermal failure parameter of the thermal failure environment. The burner 113 is connected to the fuel supply device for generating a fire source to provide the cable to be tested with a first thermal failure parameter of a thermal failure environment, so that the fuel component can simulate a more real fire environment, and thus the cable to be tested is thermally failed in the above fire environment, and the obtained thermal failure parameter is more accurate.
Referring to fig. 2, the fuel supply apparatus includes a fuel supply system 111 and a fuel flow controller 112, wherein the fuel flow controller 112 is respectively connected to the fuel supply system 111 and the burner 113, the fuel supply system 111 can provide fuel, the fuel flow controller 112 can adjust a first thermal failure parameter of a thermal failure environment, and the burner 113 can ignite the fuel to generate a fire source.
In some of the above embodiments, the fuel provided by the fuel supply device is a combustible gas, which includes, but is not limited to, hydrogen (H) gas2) Carbon monoxide (CO), methane (CH)4) Ethane (C) 2H6) Propane (C)3H8) Butane (C)4H10) Ethylene (C)2H4) Propylene (C)3H6) Butene (C)4H8) Acetylene (C)2H2) Propyne (C)3H4) Butyne (C)4H6)。
In some embodiments of the present application, the first thermal failure parameter comprises an intensity of a flame. It will be appreciated that the fuel flow controller 112 described above may control the fuel flow and thus the intensity of the flame, i.e. the greater the fuel flow, the stronger the intensity of the flame. Therefore, fire environments with different intensities can be provided for the cable to be tested, and more comprehensive cable thermal failure parameters can be obtained.
In the embodiment of the present application, the insulation resistance measuring part 12 may measure insulation resistance between wires inside the cable. When the cable to be tested is in a thermal failure environment, the insulation resistance measured by the insulation resistance measuring part 12 changes, and the thermal failure time of the cable can be reflected through the change of the insulation resistance. Thus, a response may be made to reduce the safety risk during the thermal failure time described above. The insulation resistance measuring unit 12 is not particularly limited as long as the insulation resistance between the wires inside the cable can be measured. For example, the insulation resistance measuring part 12 may be an insulation resistance tester.
Referring to fig. 2, in some embodiments of the present application, the monitoring unit 13 includes a thermocouple 131 and a temperature testing unit 132, wherein the thermocouple 131 is disposed in a heat-collecting region of the cable to be tested to measure a temperature of the heat-collecting region. The temperature test member 132 is electrically connected to the thermocouple 131, and is configured to output a temperature measured by the thermocouple 131.
In general, the thermocouples 131 are distributed in an array in a heat accumulation region of the cable to be tested, where the flame portion of the fire source is in an orthographic projection region of the cable to be tested. The thermocouple 131 array comprises a plurality of groups of K-type patch thermocouples 131 and K-type armored thermocouples 131, and can measure the temperature of the inner and outer surfaces of a cable or the inner and outer surfaces of a bridge (metal pipe) and the like at the same time. In addition, the arrangement position and mode of the thermocouple 131 can be adjusted according to actual conditions.
The temperature test piece 132 is electrically connected with the thermocouple 131, and further can collect signals of the thermocouple 131, so as to output the real-time temperature of the heat accumulation area of the cable to be tested.
In addition, in other embodiments of the present application, the monitoring component 13 may also be a temperature sensor, a smoke sensor, a gas sensor, an image-based fire detector, or the like.
With continued reference to fig. 2, in some embodiments of the present application, the simulation testing device 10 further includes a gas collecting channel 14, the burner 113 is located in the gas collecting channel 14, and the gas collecting channel 14 includes a support 141 and a cover 142 mounted on the support 141.
In the above embodiment, the gas collecting hood 14 not only can maintain a high temperature environment in case of fire, but also can collect smoke generated by fire.
In some embodiments of the present application, the cover 142 is opened with an opening with adjustable opening.
The opening setting of above-mentioned adjustable aperture can adjust the oxygen content in the gas collecting channel 14, and then the intensity of adjustable burning things which may cause a fire disaster. Furthermore, in some embodiments of the present application, the opening of the enclosure 142 may also be completely closed, i.e. under closed conditions, to obtain the thermal failure parameters of the cable.
In the above embodiments, the material of the support 141 is a high temperature resistant stainless steel material, and the size of the gas collecting hood 14 formed by the support 141 can be designed according to practical situations. The cover body 142 can be made of high-temperature-resistant fireproof glass material, and the material has the advantages of light weight, good smoke collection effect and the like.
With continued reference to FIG. 2, in some embodiments of the present application, the simulation test apparatus 10 further comprises a gas detection component 15, wherein the gas detection component 15 comprises a gas collection member 151 and a gas detection member 152. Wherein, the gas collecting element 151 is disposed in the gas collecting channel 14 and is used for collecting gas generated by the cable to be tested in a thermal failure environment. The gas detecting member 152 is connected to the gas collecting member 151 for analyzing the composition and content of the gas collected by the gas collecting member 151.
In the above embodiment, the gas collecting part 151 can collect the flue gas in the simulation test apparatus 10, and then the gas detecting part 152 can detect the flue gas, so as to obtain the components and the content of the flue gas. Therefore, the gas composition and the corresponding content of the cable generated in the thermal failure environment can be known, and the physical health and the personal safety of maintenance workers can be guaranteed.
In some embodiments of the present application, gas collection element 151 is a gas collection element that may be conventional in the art, and gas detection element 152 may also be a gas detector that is conventional in the art.
In some embodiments of the present application, the second thermal failure parameter includes a distance between the cable under test and a flame location of the fire source and an orientation of the cable under test relative to the fire source.
In the above embodiments, installation of the cable may be facilitated by the second thermal failure parameter, thereby minimizing thermal failure of the cable.
With continued reference to fig. 3, in some embodiments of the present application, the adjustment member 16 includes a load-bearing platform 161 and a support bar 162. The bearing platform 161 has a first surface and a second surface which are arranged oppositely, and the first surface is used for bearing a cable to be tested. One end of the supporting rod 162 is connected to the second surface of the bearing platform 161, the other end of the supporting rod 162 is detachably connected to the bracket 141, and the supporting rod 162 can adjust a 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.
In the above embodiment, the supporting rod 162 is detachably connected to the bracket 141, so that the supporting rod 162 can be connected along the axial direction of the bracket 141, thereby adjusting the distance between the cable to be measured and the flame portion of the fire source or the orientation of the cable to be measured relative to the fire source through the bearing platform 161. Installation of the cable may be facilitated by a second thermal failure parameter, thereby minimizing thermal failure of the cable.
For example, if the distance between the cable to be tested and the flame portion of the fire source is adjusted, the supporting rod 162 may be detached from the bracket 141, and the supporting rod 162 may be connected to the bracket 141 again according to the preset distance between the cable to be tested and the flame portion of the fire source. If the orientation of the cable to be measured with respect to the fire source is adjusted, the supporting rod 162 may be connected to the bracket 141 at different positions.
In some embodiments of the present application, a conveyor belt may be mounted on the carrier platform 161, by which the cable to be tested may be adjusted to a position required for testing. In this embodiment, the carrying platform 161 and the conveyor belt can be made of high temperature resistant fireproof rubber material.
In some embodiments of the present application, the support bar 162 is a retractable support bar 162.
In the above embodiment, the adjustment of the second thermal failure parameter is made simple by the retractable support bar 162. And above-mentioned bracing piece 162 can adopt high temperature resistance stainless steel material, makes its stable in structure, and automatic flexible effectual.
Referring to fig. 3, in some embodiments of the present application, the adjusting component 16 further includes an adjusting panel 163, and the adjusting panel 163 is disposed on a side of the supporting platform 161 and connected to the supporting rod 162 for controlling the supporting rod 162 to adjust a distance between the cable to be tested and a flame portion of the fire source or an orientation of the cable to be tested relative to the fire source.
In the above embodiment, the second thermal failure parameter is inputted through the adjusting panel 163, so that the movement of the supporting rod 162 can be controlled to adjust the second thermal failure parameter between the cable to be tested and the fire source, and thus, the adjustment of the second thermal failure parameter becomes simpler and more convenient.
In some embodiments of the present application, a guide rail may be provided in the axial direction on the bracket 141, and one end of the support bar 162 may move along the guide rail, which also helps to adjust the second thermal failure parameter.
With continued reference to FIG. 3, in some embodiments of the present application, the support bar 162 is provided with a load cell 164.
In other embodiments of the present application, a load cell 164 may also be disposed on the load-bearing platform 161.
In the above embodiment, the mass change of the cable during thermal failure can be monitored by the load cell 164, which facilitates further study of the thermal failure of the cable.
Referring to fig. 4, in some embodiments of the present application, the simulation testing apparatus 10 further includes a processing unit 17, wherein the processing unit 17 is electrically connected to the insulation resistance measuring unit 12, the monitoring unit 13 and the adjusting unit 16, and is configured to obtain each threshold value of the thermal failure of the cable to be tested according to the first thermal failure parameter, the insulation resistance measured by the insulation resistance measuring unit 12, the temperature obtained by the monitoring unit 13 and the second thermal failure parameter.
Further, the processing section 17 may be electrically connected to the gas detection member 152 in the gas detection section 15.
In the above embodiment, the processing component 17 can integrate the obtained cable thermal failure parameters, so as to more intuitively understand the relationship between the cable thermal failure parameters, thereby providing a basis for further research on the cable thermal failure.
In some embodiments of the present application, the processing component 17 may be a computer.
In a second aspect, the present application further provides a testing method for cable thermal failure, where the testing method employs the simulation testing apparatus in any of the above embodiments, and the testing method includes the following steps:
Providing a thermal failure environment with a fire source for a cable to be tested, and acquiring a first thermal failure parameter of the thermal failure environment;
acquiring the insulation resistance of a cable to be tested in a thermal failure environment;
acquiring the temperature of a heat accumulation area of the cable to be detected, wherein the heat accumulation area is distributed close to a fire source;
acquiring a second thermal failure parameter between the cable to be tested and the fire source;
and obtaining each critical value of the thermal failure of the cable to be tested according to the first thermal failure parameter, the insulation resistance, the temperature of the heat accumulation area and the second thermal failure parameter.
Specifically, a fuel supply device in the fuel component is used for supplying fuel to the combustor, a fire source is generated, a thermal failure environment is provided for the cable to be tested through the fire source, and a first thermal failure parameter can be obtained through the fuel component. And then the insulation resistance of the cable to be measured in the thermal failure environment is obtained through the insulation resistance measuring part, the temperature of the heat-collecting area of the cable to be measured can be obtained through the monitoring part, and a second thermal failure parameter between the cable to be measured and the fire source can be obtained through the adjusting part.
According to the technical scheme, the cable to be tested can be thermally disabled in a real fire environment through the simulation testing device, more comprehensive cable thermal failure parameters are obtained, further deep research on the cable in the real fire environment is facilitated, and safety risks caused by thermal failure of the cable are reduced as far as possible.
In some embodiments of the present application, the testing method further comprises the steps of:
and acquiring the components and the content of the gas generated by the cable to be tested in the thermal failure environment.
In the above embodiments, this can be realized by simulating the gas detection part in the test apparatus.
In some embodiments of the present application, the testing method further comprises the steps of:
and acquiring the weight of the cable to be tested in a thermal failure environment.
In the above embodiments, this is achieved by a load cell in the adjustment member.
The following examples were tested in relation to different cabling modes (bridge, metal-touch and direct-hang cabling) and the results are shown in fig. 5 to 7.
In this context, the flame of the fire source may have a flame continuous zone, a flame intermittent zone, and a flue gas zone.
Referring to fig. 5, fig. 5 is a graph showing the change of the internal temperature and the insulation resistance of the cable to be tested with time according to some embodiments of the present disclosure. As can be seen from fig. 5, when the insulation resistance value of the cable to be tested has 1 order of magnitude of dip, the cable has a thermal failure phenomenon, which may be referred to as an insulation failure point of the cable, that is, a corresponding time is referred to as an insulation failure time of the cable, the insulation failure time is 370s, an internal temperature of the cable is referred to as an insulation failure temperature of the cable, and the insulation failure temperature is 288.4 ℃.
Referring to fig. 6(a) and 6(b), fig. 6(a) and 6(b) are graphs of internal temperature and time of cables to be tested in different flame areas and different laying modes in some embodiments of the present application. As can be seen from fig. 6(a) and 6(b), the temperature of the cable in the flame continuous zone, the flame intermittent zone and the flue gas zone varies with time and obviously differs. Meanwhile, under different laying modes of the cable in the same flame region, the temperature rise curve inside the cable is obviously different, and the test result can be used for influencing the thermal response inside the cable in different fire environments and different laying modes.
Referring to fig. 7(a), 7(b) and 7(c), 7(a), 7(b) and 7(c) are graphs of temperature versus time for various applications of the outer cable surface and the inner and outer bridge surfaces in different flame zones in some embodiments of the present application. As can be seen from fig. 7(a), 7(b) and 7(c), in each flame region, there is a significant difference in the temperature of the outer surface of the cable and the inner and outer surfaces of the bridge, and the test result is significant in revealing the thermal response characteristics of the cable in different fire environments.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (16)
1. A simulation test apparatus for thermal failure of a cable, comprising:
the combustion component is used for providing a thermal failure environment with a fire source for the cable to be tested, and a first thermal failure parameter of the thermal failure environment can be adjusted through the combustion component;
the insulation resistance measuring component is used for connecting the cable to be measured so as to measure the insulation resistance of the cable to be measured in the thermal failure environment;
the monitoring component is at least capable of acquiring the temperature of a heat accumulation area of the cable to be detected, wherein the heat accumulation area is distributed close to the fire source;
an adjustment component for carrying the cable under test and capable of adjusting a second thermal failure parameter between the cable under test and the fire source.
2. The simulation test apparatus of claim 1, wherein the combustion component comprises:
a fuel supply for providing fuel and capable of adjusting a first thermal failure parameter of the thermal failure environment via the fuel supply;
a burner connected to the fuel supply for generating a fire source to provide a thermal failure environment to the cable under test.
3. The dummy test apparatus of claim 1 or 2 wherein the first thermal failure parameter comprises the intensity of a flame.
4. The simulation test apparatus of claim 1, wherein the monitoring component comprises:
the thermocouple is arranged in the heat accumulation area of the cable to be measured so as to measure the temperature of the heat accumulation area;
and the temperature testing piece is electrically connected with the thermocouple and used for outputting the temperature measured by the thermocouple.
5. The simulation test device of claim 2, further comprising a gas collection enclosure, the burner being located within the gas collection enclosure, the gas collection enclosure comprising a support and an enclosure body mounted to the support.
6. The simulation test device of claim 5, wherein the housing defines an opening with an adjustable opening.
7. The simulation test apparatus of claim 5 or 6, further comprising a gas detection component comprising:
the gas collecting piece is arranged in the gas collecting hood and used for collecting gas generated by the cable to be tested in the thermal failure environment;
and the gas detection part is connected with the gas collection part and is used for analyzing the components and the content of the gas collected by the gas collection part.
8. The simulation test device of claim 1, wherein the second thermal failure parameter comprises a distance between the cable under test and a flame location of the fire source and an orientation of the cable under test relative to the fire source.
9. The simulation test apparatus of claim 5, wherein the adjustment member comprises:
the bearing platform is provided with a first surface and a second surface which are arranged oppositely, and the first surface is used for bearing the cable to be tested;
the bracing piece, the one end of bracing piece connect in load-bearing platform's second surface, the other end detachable of bracing piece connect in the support, the bracing piece can be through being used for bearing the cable that awaits measuring load-bearing platform adjusts the cable that awaits measuring with distance between the flame position of burning things which may cause a fire disaster or the cable that awaits measuring for the position of burning things which may cause a fire disaster.
10. The simulation test apparatus of claim 9, wherein the support rod is a retractable support rod.
11. The simulation test device of claim 9, wherein the adjustment component further comprises an adjustment panel, the adjustment panel is disposed on a side surface of the carrying platform and connected to the support rod for controlling the support rod to adjust a distance between the cable to be tested and the flame portion of the fire source or an orientation of the cable to be tested relative to the fire source.
12. The simulation test device of any one of claims 9 to 11, wherein the support bar is provided with a load cell.
13. The simulation test device according to claim 1, further comprising a processing component electrically connected to the insulation resistance measuring component, the monitoring component and the adjusting component, for obtaining respective critical values 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.
14. A test method for thermal failure of a cable, characterized in that the test method employs the simulation test apparatus of any one of claims 1 to 13, the test method comprising the steps of:
providing a thermal failure environment with a fire source for a cable to be tested, and acquiring a first thermal failure parameter of the thermal failure environment;
acquiring the insulation resistance of the cable to be tested in the thermal failure environment;
acquiring the temperature of a heat accumulation area of the cable to be detected, wherein the heat accumulation area is distributed close to the fire source;
Acquiring a second thermal failure parameter between the cable to be tested and the fire source;
and obtaining each critical value of the thermal failure of the cable to be tested according to the first thermal failure parameter, the insulation resistance, the temperature of the heat accumulation area and the second thermal failure parameter.
15. The testing method of claim 14, further comprising the steps of:
and acquiring the components and the content of the gas generated by the cable to be tested in the thermal failure environment.
16. The testing method of claim 14, further comprising the steps of:
and acquiring the weight of the cable to be tested in a thermal failure environment.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520025A (en) * | 2023-05-17 | 2023-08-01 | 重庆大学 | Insulation resistance testing method of fire-resistant cable under fire condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520025A (en) * | 2023-05-17 | 2023-08-01 | 重庆大学 | Insulation resistance testing method of fire-resistant cable under fire condition |
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