Experimental device and test method for simulating damp and hot corrosion channel multi-cable fault fire

Abstract

The invention provides an experimental device and a testing method for simulating a damp and hot corrosion channel multi-cable fault fire hazard. The experimental device integrates a vertical channel, a damp and hot corrosion environment control system, a cable spacing electric adjusting system, a channel spacing electric adjusting system, an electrical fault simulation module, a data acquisition system and the like. Wherein the vertical channel constructs an ignition space, the distance adjusting system accurately simulates cable layout, the damp and hot corrosion environment control system restores severe working conditions by means of thermal radiation and acid-base water mist, the electrical fault simulation module simulates electrical faults, and the data acquisition system collects key data in all directions. Therefore, the fire hazard characteristics of the electrified overload cable in a humid and hot corrosion environment can be deeply analyzed. The device provides an accurate and comprehensive platform capable of simulating various actual working conditions for researching fire behaviors of the cable in a complex environment, greatly improves the accuracy and scientificity of cable fire risk assessment, and is beneficial to formulating more perfect electrical safety specifications and protection measures.

Description

Technical Field

[0001] The invention belongs to the field of fire safety and electrical technology, and in particular relates to a multi-cable fault fire experimental device and a testing method for simulating a wet heat corrosion channel. Background Art

[0002] With the rapid growth of power supply demand for electrification construction and large-scale infrastructure in my country, the safety of cable fires has become a key topic of concern in the academic and engineering communities. Since cables are mostly laid in closed or semi-closed spaces such as tunnels, pipe galleries or underground spaces, once a fire occurs, the heat release rate of the fire is fast, the temperature is high, and a large amount of toxic gases are released, which can easily trigger a chain reaction, causing heavy casualties and property losses.

[0003] At present, cable fire research is mostly limited to single condition testing, such as fire resistance evaluation under high temperature or overload conditions. Traditional experimental methods usually use standard temperature rise conditions, which cannot accurately simulate the cable fire characteristics under the combined effects of multiple factors such as humidity, heat, acid and alkali corrosion, and electrical overload in the actual environment. In addition, the insulation performance degradation and conductor oxidation of cables in long-term service in a humid and hot corrosive environment seriously affect their fire response characteristics under electrical faults. Therefore, the fire safety of cables that have been in service for a long time and are affected by complex environments has become an important scientific issue in the field of electrical safety.

[0004] Although there are related simulation devices in existing research, they can only test the combustion characteristics of energized cables and cannot simulate the real complex cable fire environment. Therefore, it is urgent to develop a cable fire characteristics experimental platform that can comprehensively simulate the wet and hot corrosion environment and electrical overload and other factors. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a multi-cable fault fire experimental device and test method simulating a moist heat corrosion channel, aiming to simulate the characteristics of fire occurring in energized overloaded cables in a moist heat corrosion environment, and reproduce the fire process caused by the combined action of multiple factors such as moisture, heat, acid and alkali corrosion and overload current in the actual environment.

[0006] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0007] The first aspect of the present invention provides a multi-cable fault fire experimental device simulating a wet heat corrosion channel, comprising:

[0008] Vertical channel, hot and humid corrosion environment control system, cable spacing electric adjustment system, channel spacing electric adjustment system, electrical fault simulation module and data acquisition system;

[0009] An ignition system is provided at the bottom of the vertical channel to provide a closed space for the cables and ignite the cables;

[0010] The channel spacing electric adjustment system is arranged at the bottom of the vertical channel and is used to adjust the spacing between the side walls of the vertical channel according to the preset channel spacing;

[0011] The cable spacing electric adjustment system is arranged at the top of the vertical channel and is used to adjust the spacing between cables in the vertical channel according to the preset cable spacing;

[0012] The wet heat corrosion environment control system is used to adjust the ambient temperature and pH value in the vertical channel according to the preset target temperature and target pH value by heat radiation and acid-base water mist of specific pH value respectively;

[0013] The electrical fault simulation module is used to load a current exceeding the cable rating to the cable;

[0014] The data acquisition system is used to collect temperature data and image data in the vertical channel in order to analyze the characteristics of fires caused by overloaded cables in a hot and humid corrosive environment.

[0015] Preferably, the wet heat corrosion environment control system comprises: a heating radiation device;

[0016] The heating radiation device is used to adjust the ambient temperature in the vertical channel to a preset target temperature by means of heat radiation;

[0017] The heating radiation device includes a first PLC control module, a potentiometer, a heating tube and a temperature detector; the heating tube is arranged in the vertical channel;

[0018] The first PLC control module is used to output a first control signal to adjust the resistance of the potentiometer, change the current passing through the heating tube, and thus adjust the heating power; it is also used to adjust the first control signal according to the temperature data fed back by the temperature detector so that the ambient temperature in the vertical channel is maintained at a preset target temperature.

[0019] Preferably, the wet heat corrosion environment control system further comprises: a wet corrosion device;

[0020] The wet corrosion device is used to adjust the pH value in the vertical channel to a preset target pH value through acid-base water mist of a specific pH value;

[0021] The wet etching device includes a second PLC control module, a flow valve, an acid-base pump, a mixing chamber, a pressurized atomization device, a nozzle and a pH monitoring device; the nozzle is arranged in the vertical channel;

[0022] The second PLC control module is used to output a second control signal to adjust the opening of the flow valve and the flow rate of the acid-base pump, and fully mix the water and acid-base of the specific flow rate of the flow valve and the acid-base pump through the mixing chamber, and then form acid-base water mist through a pressurized atomization device and spray it into the vertical channel through a nozzle; it is also used to adjust the second control signal according to the acid-base data feedback from the pH monitoring device, so that the pH value in the vertical channel is maintained at a preset target pH value.

[0023] Preferably, the channel spacing electric adjustment system includes:

[0024] The third PLC control module, the servo motor, the linear actuator, the guide rail system, the channel support frame and the position sensor; the channel support frame and the guide rail system are arranged at the bottom of the vertical channel, and the channel support frame is slidably arranged on the guide rail system;

[0025] The third PLC control module is used to output a third control signal to drive the linear actuator through a servo motor to move the channel support frame along the guide rail system; it is also used to ensure that the channel support frame moves to a set position based on position information feedback from the position sensor, so that the spacing between the vertical channel side walls is maintained at a preset channel spacing.

[0026] Preferably, the cable spacing electric adjustment system comprises:

[0027] Fourth PLC control module, stepper motor, guide rail, cable fixing slider, position sensor and reducer;

[0028] The guide rail and the cable fixing slider are arranged at the top of the vertical channel, and the cable fixing slider is slidably arranged on the guide rail;

[0029] The fourth PLC control module is used to output a fourth control signal to drive the cable fixing slider to move along the guide rail through a stepper motor; it is also used to adjust the reducer according to the position information feedback from the position sensor to ensure that the cable fixing slider moves to the set position, so that the spacing between the cables in the vertical channel is maintained at a preset cable spacing.

[0030] Preferably, the electrical fault simulation module includes:

[0031] A fifth PLC control module, an AC power supply, an overload trigger, an adjustable resistor and a current sensor; the AC power supply is used to apply current to the cable;

[0032] The fifth PLC control module is used to output a fifth control signal to control the overload trigger to adjust the adjustable resistor to change the current flowing through the cable; it is also used to adjust the fifth control signal according to the current data fed back by the current sensor to cause the cable to overload.

[0033] Preferably, the vertical channel is surrounded by four closed surfaces, two opposite surfaces of which are made of high temperature resistant fireproof glass, and the other two opposite surfaces are made of bakelite.

[0034] Preferably, the ignition system comprises: a DC power supply and a heating coil;

[0035] A DC power supply is used to provide power to the heating coil;

[0036] The heating coil is used to ignite the cable by heating it.

[0037] Preferably, the data acquisition system comprises: an image data acquisition system and a temperature data acquisition system;

[0038] The image data acquisition system is used to acquire image data in the channel through the glass surface of the vertical channel;

[0039] The temperature data acquisition system is used to collect temperature data in the vertical channel.

[0040] The second aspect of the present invention provides a method for simulating a damp heat corrosion channel multi-cable fault fire test, which is implemented based on the simulated damp heat corrosion channel multi-cable fault fire test experimental device of the first aspect, and includes the following steps:

[0041] Start the experimental device;

[0042] Set the target temperature and target pH value in the wet heat corrosion environment control system, and wait for the ambient temperature and pH value in the vertical channel to reach the corresponding set values;

[0043] Set the channel spacing and cable spacing in the channel spacing electric adjustment system and the cable spacing electric adjustment system, and wait for the spacing between the vertical channel side walls and between the cables to reach the corresponding set values;

[0044] Start the electrical fault simulation module and wait for the cable to be overloaded;

[0045] Start the ignition system to simulate the fire behavior of the cable;

[0046] The combustion characteristic parameters in the vertical channel are obtained by using a data acquisition system;

[0047] Shut down all systems and power supplies;

[0048] The combustion characteristic parameters are used to quantitatively evaluate the combustion characteristics of overloaded cables under the multiple effects of hot and humid corrosive environment.

[0049] In summary, the present invention provides a multi-cable fault fire experimental device for simulating a wet and hot corrosion channel, which integrates a vertical channel, a wet and hot corrosion environment control system, an electric cable spacing adjustment system, an electric channel spacing adjustment system, an electrical fault simulation module, and a data acquisition system. Among them, the vertical channel provides a closed and ignitable space for the cable; the channel spacing electric adjustment system can accurately adjust the spacing between the side walls of the vertical channel, and the cable spacing electric adjustment system can accurately set the distance between cables. The combination of the two can simulate the cable conditions under various layouts. The wet and hot corrosion environment control system uses thermal radiation and acid-base water mist to accurately simulate the preset temperature and acid-base environment, and accurately restore the actual harsh working conditions. The electrical fault simulation module loads an overload current to trigger a cable fault. The data acquisition system comprehensively collects the temperature and image data in the channel for in-depth analysis of the fire characteristics of energized overloaded cables in a wet and hot corrosion environment. The device provides an accurate, comprehensive and effective platform for studying the fire behavior of cables in complex environments, which can simulate a variety of actual working conditions. It fills the gap in previous cable fire research in the comprehensive simulation of complex factors, greatly improves the accuracy and scientificity of cable fire risk assessment, and helps to formulate more complete electrical safety regulations and protective measures, effectively ensuring the safe and stable operation of electrical systems, and providing strong technical support for the development of the electrical safety field.

[0050] The present invention also provides a test method for simulating a multi-cable failure fire in a wet heat corrosion channel. When implemented, this method has the same technical effect as the above-mentioned experimental device, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0052] Figure 1 A block diagram of a multi-cable fault fire experimental device for simulating wet heat corrosion channels provided by the present invention;

[0053] Figure 2 A schematic diagram of the overall structure of the experimental device provided by the present invention;

[0054] Figure 3 A schematic diagram of the heating radiation device provided by the present invention;

[0055] Figure 4 A schematic diagram of a wet etching device provided by the present invention;

[0056] Figure 5A schematic diagram of the structure of the electric channel spacing adjustment system provided by the present invention;

[0057] Figure 6 A schematic diagram of the electric channel spacing adjustment system provided by the present invention;

[0058] Figure 7 A schematic diagram of the structure of the cable spacing electric adjustment system provided by the present invention;

[0059] Figure 8 A schematic diagram of the cable spacing electric adjustment system provided by the present invention;

[0060] Fig. 9 This is a schematic diagram of the electrical fault simulation module provided by the present invention.

[0061] In the attached drawings, 1-heating radiation device, 2-wetting corrosion device, 3-electric adjustment system for cable spacing, 4-, 5-electric adjustment system for channel spacing, 6-vertical channel, 7-high temperature resistant fireproof glass, 8-bakelite board, 9-heating coil, 10-DC power supply;

[0062] 11-PLC control module, 22-stepping motor, 23-cable fixing slider, 24-first position sensor, 25-reducer, 26-guide rail;

[0063] 27 - servo motor, 28 - linear actuator, 29 - guide rail system, 30 - channel support frame, 31 - second position sensor. DETAILED DESCRIPTION

[0064] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] See also Figure 1 The present embodiment provides a multi-cable fault fire experimental device for simulating a wet-heat corrosion channel, including: a vertical channel, a wet-heat corrosion environment control system, a cable spacing electric adjustment system, a channel spacing electric adjustment system, an electrical fault simulation module and a data acquisition system.

[0066] The vertical channel in this experimental device serves as the basic framework of the entire experiment, constructing a relatively independent and closed space. The ignition system configured at the bottom provides a fire source for the cables placed therein through a suitable ignition method, thereby initiating the process of cable failure causing fire.

[0067] The electric channel spacing adjustment system in this experimental device is installed at the bottom of the vertical channel. It relies on the electric adjustment mechanical structure and the corresponding control program (such as displacement adjustment through motor drive, screw transmission, etc., and the control system sets the target spacing value for precise control) to change the distance between the side walls of the vertical channel according to the preset channel spacing value. The electric channel spacing adjustment system can accurately control the width of the vertical channel, so that it can simulate the actual working conditions under different cable channel layouts and meet the simulation needs of various different scenarios, so as to more comprehensively study the performance of cable fault fires when the cable is arranged at different spacings.

[0068] The cable spacing electric adjustment system in this experimental device is set at the top of the vertical channel. It also uses the electric adjustment mechanical device and supporting control mechanism to accurately adjust the distance between cables in the vertical channel according to the preset cable spacing requirements. The cable spacing electric adjustment system can accurately set the distance between cables, and cooperate with the channel spacing electric adjustment system to more carefully simulate the cable conditions under various layout conditions, increase the richness of the experimental simulation scenarios, and help to gain a deeper understanding of the impact of different cable spacing on fault fires.

[0069] The wet heat corrosion environment control system in this experimental device uses a heat radiation device (such as a heating tube or other equipment that can generate heat and radiate outward) to raise or maintain the ambient temperature in the vertical channel to the preset target temperature; it adjusts the pH value in the channel by generating acid-base water mist with a specific pH value (it can be equipped with an acid-base solution storage tank, a spray device, and corresponding pH adjustment and control components to mix and spray water mist with appropriate pH according to the set value). The wet heat corrosion environment control system can accurately simulate the preset temperature and acid-base environment, and highly restore the actual harsh working conditions such as some humid, corrosive gases or liquids, making the experimental environment closer to the real complex usage scenarios, making the experimental results more practical reference value, and helping to study the fault fire characteristics of cables in wet heat corrosion environments.

[0070] The electrical fault simulation module in this experimental device is used to load a current exceeding the rated value of the cable to the cable, putting the cable in an overload state. Because the overload current will cause the cable to heat up and reduce the insulation performance, which will lead to fault phenomena such as short circuit and fire, the electrical fault simulation module can trigger the cable fault and simulate the cable fire caused by the electrical fault. It is a key link in exploring the cause and process of cable fault fire.

[0071] The data acquisition system in this experimental device can use temperature sensors (such as thermocouples, thermistors, etc. that can accurately measure temperature, reasonably distributed in different positions in the vertical channel) to collect temperature data in the channel, and use image acquisition equipment (such as high-definition cameras, installed at appropriate angles and positions to cover key areas in the channel) to collect image data, and then transmit these data to storage and analysis devices (such as computers, etc.).

[0072] This embodiment provides a simulated wet heat corrosion channel multi-cable fault fire experimental device, the whole device takes the vertical channel as the core bearing structure, the layout of the cable is flexibly adjusted by the channel spacing electric adjustment system and the cable spacing electric adjustment system, and then the wet heat corrosion environment control system creates a specific harsh environmental condition, and then the electrical fault simulation module is used to put the cable in an overload fault state, and finally the temperature and image data related to the cable fire in the channel during the experiment are collected by the data acquisition system, and the complete experimental process of simulating wet heat corrosion channel multi-cable fault fire is realized in combination, and then the fire behavior of the cable under the action of a complex environment is studied. The experimental device integrates multiple important functional parts such as vertical channels, environmental control, spacing adjustment, fault simulation and data acquisition to form a complete and collaborative experimental device system, which can carry out cable fire experimental research in a more systematic way. At the same time, the channel side wall spacing and cable spacing can be accurately adjusted, and different wet heat corrosion environments and simulated electrical faults can be simulated, so that the cable fire situation under various complex actual working conditions can be simulated, filling the gap in the previous cable fire research in the comprehensive simulation of complex factors, greatly expanding the depth and breadth of the research, and providing strong support for accurately analyzing the fire characteristics of cables in complex environments. The experimental device provided in this embodiment improves the accuracy and scientificity of cable fire risk assessment by accurately simulating actual working conditions and comprehensive data collection and analysis, which helps to formulate more practical and complete electrical safety specifications and protective measures, ensure the safe and stable operation of electrical systems, and play a strong role in promoting the development of the electrical safety field.

[0073] See also Figure 2 , Figure 2 The overall structural design of a multi-cable fault fire test device simulating a wet heat corrosion channel is shown. The whole set of experimental devices mainly consists of a vertical channel 6, a heating radiation device 1, a wet corrosion device 2, a cable spacing electric adjustment system 3, a channel structure electric adjustment system 4 and an electrical fault simulation module 5. The heating radiation device 1 is used to realize thermal aging of the cables; the wet corrosion device 2 is used to realize wet corrosion aging of the cables; the cable spacing electric adjustment system 3 is used to realize electric adjustment of the cable spacing; the channel structure electric adjustment system 4 is used to realize the regulation of the front and rear distance of the vertical channel; and the electrical fault simulation module is used to realize the simulation of cable overload.

[0074] The following combination Figure 2-9 The illustrated structure introduces other embodiments of the present invention.

[0075] In one embodiment, a heating radiation device is designed in the wet heat corrosion environment control system. The heating radiation device is used to adjust the ambient temperature in the vertical channel to a preset target temperature by heat radiation. The implementation principle of the heating radiation device is as follows: Figure 3 shown.

[0076] The heating radiation device 1 includes a first PLC control module, a potentiometer 12, a heating tube 13 and a temperature detector 14. When the device is in operation, after the target temperature is first set on the human-machine interface (HMI), the first PLC control module outputs a control signal, and by adjusting the resistance of the potentiometer 12, the current of the heating tube 13 is changed to adjust the heating power. The temperature detector 14 monitors the temperature in the channel in real time and transmits the data to the controller. The controller outputs a control signal according to the difference between the target temperature and the actual temperature, so that the temperature in the channel is maintained at the set value.

[0077] The heating radiation device 1 of this embodiment has a closed-loop control mechanism, which can accurately and stably adjust the ambient temperature in the vertical channel to the preset target temperature. This design with real-time feedback effectively improves the reliability and scientificity of the simulated experimental environment, and is conducive to accurately simulating the fault fire conditions of cables in a specific hot and humid corrosion temperature environment.

[0078] In one embodiment, the wet heat corrosion environment control system further includes a wet corrosion device; the wet corrosion device is used to adjust the pH value in the vertical channel to a preset target pH value through acidic and alkaline water mist with a specific pH value. The implementation principle of the wet corrosion device is as follows Figure 4 shown.

[0079] The wet etching device 2 includes a second PLC control module, a flow valve 15, an acid-base pump 16, a storage device 17, a mixing chamber 18, a pressurized atomization device 19, a nozzle 20 and a pH monitoring device 21. First, the required target pH value, water mist size (flow rate) and other parameters are set on the second PLC control module. The second PLC control module adjusts the opening of the flow valve 15 and the flow rate of the acid-base pump 16. The acid, alkali and water of a specific flow rate are fully mixed in the mixing chamber 18. The mixed liquid forms an acid-base water mist through the pressurized atomization device 19 and is sprayed into the vertical channel through the nozzle 20. At the same time, the pH monitoring device 21 detects the pH value in the channel in real time and transmits the data to the display screen of the controller. The controller adjusts according to the preset target pH value to finally form an acid-base water mist of a specific pH value.

[0080] The wet corrosion device 2 of this embodiment adopts a real-time monitoring and feedback design, which can highly restore the complex wet heat corrosion acid-base environment, and provide a reliable guarantee for accurately simulating the fault fire characteristics of cables under corresponding severe working conditions.

[0081] In one embodiment, a channel spacing electric adjustment system design is provided. Figure 5 and 6 , Figure 5 and 6 The structure and implementation principle of the channel spacing electric adjustment system are shown respectively.

[0082] The electric adjustment system for channel spacing includes a third PLC control module, a servo motor 27, a linear actuator 28, a guide rail system 29, a channel support frame 30, and a position sensor 31. The target channel spacing is set on the human-machine interface (HMI) of the control system. After receiving the instruction, the third PLC control module sends a control signal to the servo motor 27. The servo motor 27 drives the linear actuator 28 to move the channel support frame 30 along the guide rail system 29 to adjust the channel position. The displacement sensor 31 monitors the actual spacing in real time and feeds the data back to the control module. The control module adopts a closed-loop control algorithm (PID) to dynamically adjust the servo motor according to the feedback data to ensure that the channel spacing reaches the set value. The system has automatic operation and emergency stop functions to ensure the stability and safety of the adjustment process, realize the precise movement of the channel support frame, and effectively meet the needs of precise control of channel spacing when simulating various cable layouts.

[0083] In one embodiment, a cable spacing electric adjustment system design is provided. Figure 7 and 8 , Figure 7 and 8 The structure and implementation principle of the cable spacing electric adjustment system are shown respectively.

[0084] The cable spacing electric adjustment system includes a PLC control module 11 (i.e., the fourth PLC control module), a stepper motor 22, a guide rail 26, a cable fixing slider 23, a position sensor 24, and a reducer 25. After the target spacing is set on the human-machine interface (HMI), the PLC control module 11 controls the stepper motor 22 to start, and the motor drives the cable fixing slider 23 to move on the guide rail 26. The system is equipped with a position sensor 24 to monitor the cable spacing in real time and feed back the data to the PLC control module. According to the feedback data, the closed-loop control algorithm (PID) is used to adjust the number of rotation steps of the stepper motor. When the cable fixing slider 23 approaches the target position, the reducer 25 is adjusted by the closed-loop control algorithm (PID), so that the cable fixing slider stops, ensuring that the spacing reaches the set value. The entire process is automated to ensure the stability and repeatability of the cable spacing and meet the experimental requirements for spacing control.

[0085] In one embodiment, an electrical fault simulation module design is provided. Fig. 9 , Fig. 9 The implementation principle of the electrical fault simulation module is shown.

[0086] The electrical fault simulation module includes an AC power supply 32, a PLC control module 33 (i.e., the fifth PLC control module), an overload trigger 34, an adjustable resistor 35, and a current sensor 36. When the device is implemented, the PLC control module 33 controls the overload trigger 34, and increases the additional load by adjusting the adjustable resistor 35. The current sensor 36 monitors the current change in real time and feeds back to the control unit. The closed-loop control algorithm (PID) dynamically adjusts the overload module so that the current exceeds the rated value of the cable to simulate the occurrence of an electrical fault. At the same time, in the vertical channel, the thermal effects generated by the heating radiation and the current overload are coupled to each other and jointly affect the temperature distribution. The heating radiation generates heat through the current, resulting in a temperature gradient and diffusion through convection, while the current overload generates heat through the cable, further increasing the local temperature. When the two are superimposed, the local temperature in the channel, especially the area close to the heating source and electrical components, will increase significantly, forming a strong temperature difference, thereby causing overheating and insulation damage, and better reproducing the harsh environment in which the cable is located.

[0087] Please refer again Figure 1 In one embodiment, the vertical channel 6 is surrounded by four closed surfaces as a whole, wherein the two sides where the camera is placed are composed of high temperature resistant fireproof glass 7 with a thickness of 0.15 mm for visually observing the experimental phenomena, and the channel walls on the other two sides are composed of bakelite boards 8 with low thermal conductivity.

[0088] In a further embodiment, the ignition system uses a DC power supply 10 and a heating coil 9 to ignite the wire.

[0089] In a further embodiment, the data acquisition system is mainly composed of an image data acquisition system and a temperature data acquisition system. The image data acquisition system is a 4K digital camcorder that can monitor the experimental process in real time, while the temperature data acquisition system includes thermocouples, thermocouple fixing systems, multi-channel temperature recorders and data acquisition software, which can record and analyze temperature changes in the experiment in real time, providing basic support for scientific analysis.

[0090] The device provided by the above-mentioned embodiment integrates a wet heat corrosion environment control system, a cable spacing electric adjustment system, a channel spacing electric adjustment system, an electrical fault simulation module and a data acquisition system, and can reproduce the complex environment and fault scenarios encountered by the cable under controllable conditions. By automatically adjusting the cable spacing and channel spacing, combined with the wet heat corrosion environment, the device can accurately simulate the coupling influence of the thermal effects generated by heating radiation and current overload. When the overload current passes through the cable, the current overload effect and the heating radiation effect are superimposed, causing the temperature of the local area to rise sharply, forming a strong temperature gradient, and causing the wire to burn through the heating coil. The coupling of this thermal effect accelerates the localization of wet heat and acid-base corrosion, which may cause cable insulation damage and fire. Through the precise control and simulation of these thermal effects, the present invention can comprehensively assess the risk of electrical line fires and provide a scientific basis for the formulation of electrical safety specifications.

[0091] Based on the above embodiment, a simulated wet heat corrosion channel multi-cable fault fire test device is provided. In another embodiment of the present invention, a simulated wet heat corrosion channel multi-cable fault fire test method is also provided, comprising the following steps:

[0092] (1) Start the experimental device: Turn on the main power of the experimental device, start the PLC controller and human-machine interface, and confirm that all systems and devices are working normally.

[0093] The target temperature and the target pH value are set in the wet heat corrosion environment control system, and the ambient temperature and the pH value in the vertical channel are waited for to reach the corresponding set values. The method includes steps (2) and (3), as follows:

[0094] (2) Setting the heating radiation environment: Input the target temperature value on the human-machine interface. Start the heating radiation device 1, and the system will timely feedback and automatically adjust the temperature in the vertical channel 6, and finally form the set target temperature.

[0095] (3) Setting the wet corrosion environment: Input the target pH value and water mist flow rate on the human-machine interface. Start the wet corrosion device, and the system automatically adjusts the acid-base pump 16 and the flow valve 15 to generate water mist with the target pH value.

[0096] The channel spacing and cable spacing are set in the channel spacing electric adjustment system and the cable spacing electric adjustment system, and the spacing between the vertical channel side walls and the cables is waited to reach the corresponding set value. The method includes steps (4) and (5), as follows:

[0097] (4) Adjusting the cable spacing: Input the required cable spacing parameters on the human-machine interface. The PLC controls the stepper motor 22 to start, and moves the cable fixing slider through the guide rail 26 to adjust the cable spacing to the set value.

[0098] (5) Adjusting channel spacing: Input the target channel spacing parameter on the human-machine interface. The PLC controls the servo motor 27 to start, and moves the channel support frame 30 through the linear actuator 28 to adjust the channel spacing to the set value.

[0099] (6) Start the electrical fault simulation module and wait for the cable to be overloaded: the PLC control module controls the overload trigger 34 to increase the additional load by adjusting the adjustable resistor 35. The current sensor 36 monitors the current change in real time and feeds it back to the control unit. The closed-loop control algorithm (PID) dynamically adjusts the overload module to make the current exceed the rated value of the cable, simulating the occurrence of an electrical fault.

[0100] (7) Start the ignition system to simulate the fire behavior of the cable: pass the cables through the heating coils and fix them in the appropriate position of the sample holder. After adjusting the power output, turn on the power. After the heating coils are energized, the temperature rises rapidly, causing the insulation layer to pyrolyze and ignite the wires.

[0101] (8) Use the data acquisition system to obtain the combustion characteristic parameters in the vertical channel: Use the data acquisition system to record the development process of the cable fire in the channel in real time, and obtain the flame behavior, temperature field, fire spread rate, flame length and width and other combustion characteristic parameters inside the channel.

[0102] (9) Turn off each system and power supply: After the experiment is completed, turn off the heating radiation device 1, turn off the wet corrosion device 2, turn off the cable spacing electric adjustment system 3, turn off the channel spacing electric adjustment system 4, turn off the electrical fault simulation module, and turn off the power supply.

[0103] (10) Use combustion characteristic parameters to quantitatively evaluate the combustion characteristics of overloaded cables under the multiple effects of a wet, hot and corrosive environment: Analyze experimental data, quantitatively analyze the combustion characteristics of overloaded cables under the multiple effects of a real wet, hot and corrosive environment, and quantitatively evaluate the combustion laws of cables under a real fire thermal environment.

[0104] The test method proposed in this embodiment can conveniently input various parameters through the human-machine interface, and use the PLC controller to coordinate the automatic operation of various devices. For example, the heating radiation device can automatically feedback and adjust to form the target temperature according to the setting, the wet corrosion device automatically generates the target pH value water mist, the spacing adjustment system uses the motor and the actuator to accurately adjust the cable and channel spacing, and the electrical fault simulation module accurately simulates the overload fault through the closed-loop control algorithm. After the fire is caused, the data acquisition system can record various combustion characteristic parameters in real time, and finally can quantitatively analyze the combustion characteristics and laws of the cable in a real complex environment based on the experimental data. The whole process is highly automated, precise and systematic, filling the gap in the research of cable fires in a comprehensive and complex environment, and providing a reliable and effective overall solution for in-depth exploration of cable fire behavior.

[0105] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0106] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0107] In the embodiments disclosed in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0108] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-cable fault fire test device simulating a wet heat corrosion channel, characterized in that: include: Vertical channel, hot and humid corrosion environment control system, cable spacing electric adjustment system, channel spacing electric adjustment system, electrical fault simulation module and data acquisition system; An ignition system is disposed at the bottom of the vertical channel, which is used to provide a closed space for the cables and ignite the cables; The channel spacing electric adjustment system is arranged at the bottom of the vertical channel, and is used to adjust the spacing between the side walls of the vertical channel according to the preset channel spacing; The cable spacing electric adjustment system is arranged at the top of the vertical channel, and is used to adjust the spacing between cables in the vertical channel according to the preset cable spacing; The wet heat corrosion environment control system is used to adjust the ambient temperature and pH value in the vertical channel according to the preset target temperature and target pH value by heat radiation and acid-base water mist of specific pH value respectively; The electrical fault simulation module is used to load a current exceeding the rated value of the cable to the cable; The data acquisition system is used to collect temperature data and image data in the vertical channel so as to analyze the characteristics of fire caused by overloaded cables in a hot and humid corrosive environment.

2. The simulated hot and humid corrosion channel multi-cable fault fire test device according to claim 1 is characterized in that: The wet heat corrosion environment control system comprises: a heating radiation device; The heating radiation device is used to adjust the ambient temperature in the vertical channel to the preset target temperature by heat radiation; The heating radiation device comprises a first PLC control module, a potentiometer, a heating tube and a temperature detector; the heating tube is arranged in the vertical channel; The first PLC control module is used to output a first control signal to adjust the resistance of the potentiometer, change the current passing through the heating tube, and thus adjust the heating power; and is also used to adjust the first control signal according to the temperature data fed back by the temperature detector so that the ambient temperature in the vertical channel is maintained at a preset target temperature.

3. The simulated hot and humid corrosion channel multi-cable fault fire experimental device according to claim 2 is characterized in that: The wet heat corrosion environment control system also includes: a wet corrosion device; The wet etching device is used to adjust the pH value in the vertical channel to a preset target pH value through acidic and alkaline water mist of a specific pH value; The wet etching device includes a second PLC control module, a flow valve, an acid-base pump, a mixing chamber, a pressurized atomization device, a nozzle and a pH monitoring device; the nozzle is arranged in the vertical channel; The second PLC control module is used to output a second control signal to adjust the opening of the flow valve and the flow rate of the acid-base pump, and to fully mix the water and acid-base of the specific flow rate of the flow valve and the acid-base pump through the mixing chamber, and then form acid-base water mist through the pressurized atomization device and spray it into the vertical channel through the nozzle; it is also used to adjust the second control signal according to the acid-base data fed back by the pH monitoring device so that the pH value in the vertical channel is maintained at the preset target pH value.

4. The simulated hot and humid corrosion channel multi-cable fault fire experimental device according to claim 1 is characterized in that: The channel spacing electric adjustment system comprises: A third PLC control module, a servo motor, a linear actuator, a guide rail system, a channel support frame and a position sensor; the channel support frame and the guide rail system are arranged at the bottom of the vertical channel, and the channel support frame is slidably arranged on the guide rail system; The third PLC control module is used to output a third control signal to drive the linear actuator through the servo motor to move the channel support frame along the guide rail system; it is also used to ensure that the channel support frame moves to a set position based on the position information fed back by the position sensor, so that the spacing between the vertical channel side walls is maintained at the preset channel spacing.

5. The simulated hot and humid corrosion channel multi-cable fault fire test device according to claim 1 is characterized in that: The cable spacing electric adjustment system comprises: Fourth PLC control module, stepper motor, guide rail, cable fixing slider, position sensor and reducer; The guide rail and the cable fixing slider are arranged at the top of the vertical channel, and the cable fixing slider is slidably arranged on the guide rail; The fourth PLC control module is used to output a fourth control signal to drive the cable fixing slider to move along the guide rail through the stepper motor; it is also used to adjust the reducer according to the position information fed back by the position sensor to ensure that the cable fixing slider moves to the set position, so that the spacing between the cables in the vertical channel is maintained at the preset cable spacing.

6. The simulated hot and humid corrosion channel multi-cable fault fire test device according to claim 1 is characterized in that: The electrical fault simulation module comprises: A fifth PLC control module, an AC power supply, an overload trigger, an adjustable resistor and a current sensor; the AC power supply is used to apply current to the cable; The fifth PLC control module is used to output a fifth control signal to control the overload trigger to adjust the adjustable resistor to change the current flowing through the cable; and is also used to adjust the fifth control signal according to the current data fed back by the current sensor to cause the cable to overload.

7. The simulated hot and humid corrosion channel multi-cable fault fire test device according to claim 1 is characterized in that: The vertical passage is surrounded by four closed surfaces, two opposite surfaces of which are made of high temperature resistant fireproof glass, and the other two opposite surfaces are made of bakelite.

8. The simulated hot and humid corrosion channel multi-cable fault fire test device according to claim 1 or 7, characterized in that: The ignition system comprises: a DC power supply and a heating coil; The DC power supply is used to provide power to the heating coil; The heating coil is used to ignite the cable by heating.

9. The simulated hot and humid corrosion channel multi-cable fault fire test device according to claim 7 is characterized in that: The data acquisition system includes: an image data acquisition system and a temperature data acquisition system; The image data acquisition system is used to acquire image data in the channel through the glass surface of the vertical channel; The temperature data acquisition system is used to acquire temperature data in the vertical channel.

10. A method for simulating a multi-cable fault fire test in a wet heat corrosion channel, characterized in that: The simulated hot and humid corrosion channel multi-cable fault fire test experimental device according to any one of claims 1 to 9 is implemented, comprising the following steps: Start the experimental device; Set the target temperature and target pH value in the wet heat corrosion environment control system, and wait for the ambient temperature and pH value in the vertical channel to reach the corresponding set values; Setting the channel spacing and the cable spacing in the channel spacing electric adjustment system and the cable spacing electric adjustment system, and waiting for the spacing between the side walls and the cables of the vertical channel to reach the corresponding set values; Start the electrical fault simulation module and wait for the cable to be overloaded; Start the ignition system to simulate the fire behavior of the cable; Using a data acquisition system to obtain combustion characteristic parameters in the vertical channel; Shut down all systems and power supplies; The combustion characteristic parameters are used to quantitatively evaluate the combustion characteristics of overloaded cables under multiple effects of a hot and humid corrosive environment.

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