Direct-current wire and cable short-circuit fault generation and trace preparation device

Abstract

The invention, which relates to the technical field of the wire and cable fault experiment, discloses a direct-current wire and cable short-circuit fault generation and trace preparation device comprising a direct-current power supply control cabinet and a wire and cable heating unit comprising an experiment current output module and a control experiment acceptor heating device. The direct-current power supply control cabinet is electrically connected with the experimental current output module, the experimental current output module is electrically connected with a to-be-tested electric wire or a to-be-tested cable, and an experimental receptor section of the to-be-tested electric wire or the to-be-tested cable is arranged in an unheated environment or in a heating range for controlling the experimental receptor heating device; the device can simulate the short circuit generation process after heating under different DC voltage and current conditions, observe, test and analyze the high temperature resistance of the electric wire and cable, and research the arc characteristics, fire combustion behaviors and trace characteristics when the electric wire and cable are short-circuited. A good foundation is provided for experiment research work of the heated wire and cable short circuit generation process and trace characteristics under the direct current condition, and the research effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wire and cable fault experiments, and in particular to a device for generating and preparing short-circuit faults of direct current wires and cables. Background Art

[0002] With the rapid transformation of my country's energy structure and energy supply methods, DC electrical lines have become increasingly popular and have become an indispensable electrical circuit for daily energy supply, such as new energy vehicle electrical circuits, electric bicycle electrical circuits, DC transmission lines, etc. However, DC electrical lines have the risk of causing fires, so the safety of DC electrical lines has received widespread attention.

[0003] Compared with AC electrical lines, DC energy supply systems are more diverse, the DC voltage values ​​vary greatly, and the current does not fluctuate repeatedly or return to zero, resulting in significant differences in the fault characteristics of DC electrical lines. However, there is a lack of research on fires caused by DC electrical line faults. As a result, electrical designers are unable to correctly understand the fire hazard, and investigators are unable to accurately identify line trace characteristics and determine the cause of the failure.

[0004] Therefore, people are in urgent need of a device that can simulate the fault conditions of DC electrical lines and study the occurrence and trace preparation of short-circuit faults of DC wires and cables with good research effects. Summary of the invention

[0005] The purpose of the present invention is to provide a device for detecting and preparing short-circuit faults of DC wires and cables to solve the problems existing in the above-mentioned prior art. By changing the current, voltage and heating mode, the fault conditions of wires or cables under different conditions are simulated and trace preparation is achieved, which provides a good basis for research and improves research results.

[0006] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a device for generating and preparing short-circuit faults of DC wires and cables, comprising a DC power supply control cabinet for outputting DC power and a wire and cable heating unit, wherein the wire and cable heating unit comprises an experimental current output module for outputting DC power with the current and voltage required for the experiment and a control experimental receptor heating device, wherein the DC power supply control cabinet is electrically connected to the experimental current output module, and the experimental current output module is electrically connected to the wire to be tested or the cable to be tested, and the experimental receptor section of the wire to be tested or the cable to be tested is set in an unheated environment or within the heating range of the control experimental receptor heating device.

[0007] Preferably, the control experiment receptor heating device comprises a radiation heating device.

[0008] Preferably, the radiation heating device is a cone calorimeter.

[0009] Preferably, the control experiment receptor heating device also includes a flame heating device.

[0010] Preferably, the flame heating device is a Venturi burner.

[0011] Preferably, the control experiment receptor heating device also includes a high temperature environment control device.

[0012] Preferably, the high temperature environment control device is a muffle furnace.

[0013] Preferably, the DC power supply control cabinet is provided with a battery, a battery charging module and a charging module AC input switch, the external AC power is connected to the battery through the charging module AC input switch and the battery charging module, the wire and cable heating unit includes a DC output switch, and the battery is connected to the experimental current output module through the DC output switch.

[0014] Preferably, the DC power supply control cabinet is provided with an industrial computer display, an industrial computer keyboard and mouse, and an industrial computer main chassis. The industrial computer display and the industrial computer keyboard and mouse are connected to the industrial computer main chassis, and the industrial computer main chassis is electrically connected to the experimental current output module.

[0015] Preferably, the DC power supply control cabinet is provided with an experiment start button, an experiment stop button and a main power emergency stop button.

[0016] Compared with the prior art, the present invention mainly achieves the following technical effects:

[0017] The experimental current output module cooperates with the experimental receptor section of the cable to be tested set in an unheated environment, so as to realize the occurrence and trace preparation of short-circuit faults of wires and cables under overcurrent internal heating conditions. The experimental current output module cooperates with the experimental receptor section of the cable to be tested set in the heating range of the control experimental receptor heating device, so as to realize the occurrence and trace preparation of short-circuit faults of wires and cables under external heating conditions. That is, this device can simulate the short-circuit process after heating under different DC voltage and current conditions, observe and test and analyze the high temperature resistance of wires and cables, and study the arc characteristics, ignition behavior and trace characteristics when short circuit occurs, so as to realize the simulation preparation and observation analysis of short-circuit occurrence, ignition process and typical traces, and provide a good foundation for the experimental research work on the short-circuit process and trace characteristics of heated wires and cables under DC conditions, thereby improving the research effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 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 labor.

[0019] Figure 1 It is a structural schematic diagram of a device for generating and preparing a short-circuit fault of a DC electric wire or cable according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of a DC power supply control cabinet in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a wire and cable heating unit in an embodiment of the present invention;

[0022] Figure 4 is a front view of a cone calorimeter in an embodiment of the present invention;

[0023] Figure 5 It is a left side view of the cone calorimeter in the embodiment of the present invention;

[0024] Figure 6 is a top view of a cone calorimeter according to an embodiment of the present invention;

[0025] Figure 7 is an axonometric diagram of a cone calorimeter in an embodiment of the present invention;

[0026] Figure 8 A front view of a venturi burner in an embodiment of the present invention;

[0027] Fig. 9 It is a left side view of the venturi burner in the embodiment of the present invention;

[0028] Fig.10 A top view of a venturi burner in an embodiment of the present invention;

[0029] Fig.11 An axonometric diagram of a venturi burner in an embodiment of the present invention;

[0030] Fig.12 Schematic diagram of the structure of the muffle furnace in the embodiment of the present invention;

[0031] Among them, 1. DC power supply control cabinet; 2. Wire and cable heating unit; 3. Experimental current output module; 4. Cone calorimeter; 5. Venturi burner; 6. Muffle furnace; 7. Battery charging module; 8. Charging module AC input switch; 9. DC output switch; 10. Industrial computer display; 11. Industrial computer main chassis; 12. Keyboard box; 13. Industrial computer switch; 14. Experiment start button; 15. Experiment stop button; 16. Main power emergency stop button; 17. Experimental power supply voltage display; 18. Experimental power supply current display. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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.

[0033] The purpose of the present invention is to provide a device for detecting and preparing short-circuit faults of DC wires and cables to solve the problems existing in the prior art. By changing the current, voltage and heating mode, the fault conditions of wires or cables under different conditions are simulated and traces are prepared, which provides a good basis for research and improves research results.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Please refer to Figures 1 to 12As shown, a device for generating and preparing short-circuit faults of direct current wires and cables is provided, comprising a direct current power supply control cabinet 1 for outputting direct current and a wire and cable heating unit 2, the wire and cable heating unit 2 comprising an experimental current output module 3 and a control experimental receptor heating device, the experimental current output module 3 outputs direct current of current and voltage required for the experiment by rectification, voltage regulation and the like, the direct current power supply control cabinet 1 is electrically connected to the experimental current output module 3, the experimental current output module 3 is electrically connected to the wire or cable to be tested, the experimental receptor section of the wire or cable to be tested is set in an unheated environment or within the heating range of the control experimental receptor heating device; the principle of the device is: the experimental current output module 3 cooperates with the experimental receptor of the cable to be tested set in an unheated environment The experimental current output module 3 cooperates with the experimental receptor section of the cable to be tested which is arranged within the heating range of the experimental receptor heating device to control the short circuit faults of the wires and cables under external heating conditions, that is, the device can simulate the short circuit process after heating under different DC voltage and current conditions, observe and test the high temperature resistance of the wires and cables, study the arc characteristics, ignition behavior and trace characteristics when a short circuit occurs, realize the simulation preparation and observation and analysis of the short circuit occurrence, ignition process and typical traces, provide a good foundation for the experimental research work on the short circuit process and trace characteristics of heated wires and cables under DC conditions, and thus improve the research effect.

[0036] The control experiment receptor heating device includes a radiation heating device. In this embodiment, the radiation heating device is a cone calorimeter 4. Specifically: the wires and cables are placed under the cone calorimeter 4 for radiation heating, simulating the short circuit process of the wires and cables under different DC voltage and current conditions, and realizing the simulation preparation and observation and analysis of the short circuit occurrence, ignition process and typical traces; in other embodiments, the radiation heating can also be realized by surrounding the heating belt or other structures that can realize radiation heating.

[0037] The control experiment receptor heating device also includes a flame heating device. In this embodiment, the flame heating device is a Venturi burner 5. Specifically: the wires and cables are placed under the Venturi burner 5 for direct flame heating, simulating the short circuit process of the wires and cables under different DC voltage and current conditions, supporting the experimental research work on the short circuit process and trace characteristics of the wires and cables directly heated by flames under DC conditions; in other embodiments, other flame generating devices that can spray flames can also be used.

[0038] The controlled experimental receptor heating device also includes a high-temperature environment control device. In this embodiment, the high-temperature environment control device is a muffle furnace 6. Specifically: the wires and cables are placed in the muffle furnace 6 with left and right openings to simulate the high-temperature environment, realize the simulation preparation and observation analysis of short circuit occurrence, ignition process and typical traces, and support the experimental research work on the short circuit occurrence process and trace characteristics of wires and cables in a high-temperature environment under DC conditions. In other embodiments, the high-temperature environment control device can also be a heating box, or other equipment that can increase the ambient temperature.

[0039] The radiation heating device, flame heating device and high temperature environment control device are all arranged outside the cabinet where the experimental current output module 3 is located, or a corresponding installation space is set on the cabinet for installing the radiation heating device, flame heating device and high temperature environment control device.

[0040] The experimental current output module 3 is provided with an experimental power supply voltage display 17 and an experimental power supply current display 18 for displaying the experimental voltage and the experimental current.

[0041] The experimental current output module 3 can output direct current of different currents and voltages. In conjunction with the setting of the radiation heating device, the flame heating device and the high-temperature environment control device, four different heating methods, namely, overcurrent internal heating, flame, radiation and environmental heating, are realized, which greatly improves the simulation range of the device, thereby improving the simulation effect and further improving the research effect.

[0042] In this embodiment, the DC power supply control cabinet 1 is provided with a battery, a battery charging module 7 and a charging module AC input switch 8. External AC power is connected to the battery through the charging module AC input switch 8 and the battery charging module 7 to realize the charging of the battery. The wire and cable heating unit 2 includes a DC output switch 9. The battery is connected to the experimental current output module 3 through the DC output switch 9 to realize the DC output of the battery.

[0043] The DC power supply control cabinet 1 is provided with an industrial computer display 10, an industrial computer keyboard and mouse, and an industrial computer main chassis 11. The industrial computer display 10 and the industrial computer keyboard and mouse are all connected to the industrial computer main chassis 11, and the industrial computer main chassis 11 is electrically connected to the experimental current output module 3. The industrial computer main chassis 11 is used to record the instantaneous voltage and current fluctuations during the experiment in real time. The industrial control display is used to display the waveform of the voltage and current changes over time. The arc energy when a short circuit breakdown occurs can be calculated through the quantitative timing relationship between the voltage, current values ​​and time, thereby realizing an in-depth study of the short circuit process. The DC power supply control cabinet 1 is provided with an industrial computer switch 13 for turning on the industrial computer main chassis 11.

[0044] A keyboard box 12 is drawable on the DC power supply control cabinet 1 , and the keyboard and mouse of the industrial computer are arranged in the keyboard box 12 .

[0045] The DC power supply control cabinet 1 is provided with an experiment start button 14, an experiment stop button 15 and a main power emergency stop button 16, which are respectively used for starting the experiment, stopping the experiment and emergency stop in an emergency.

[0046] During actual use, different heating modes are selected, and the device can be turned on after adjusting the output current and voltage to simulate the short circuit process after heating under different DC voltage and current conditions, observe, test and analyze the high temperature resistance of wires and cables, and study the arc characteristics, fire and combustion behavior and trace characteristics when a short circuit occurs.

[0047] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0048] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A device for detecting and preparing short-circuit faults of DC wires and cables, characterized in that: It includes a DC power supply control cabinet for outputting DC power and a wire and cable heating unit, wherein the wire and cable heating unit includes an experimental current output module for outputting DC power of current and voltage required for the experiment and a control experiment receptor heating device, the DC power supply control cabinet is electrically connected to the experimental current output module, the experimental current output module is electrically connected to the wire to be tested or the cable to be tested, and the experimental receptor section of the wire to be tested or the cable to be tested is set in an unheated environment or in the heating range of the control experiment receptor heating device.

2. The device for detecting and preparing short-circuit faults of DC wires and cables according to claim 1, characterized in that: The control experiment receptor heating device includes a radiation heating device.

3. The device for detecting and preparing short-circuit faults of DC wires and cables according to claim 2, characterized in that: The radiation heating device is a cone calorimeter.

4. The device for detecting and preparing short-circuit faults of DC wires and cables according to claim 2, characterized in that: The control experiment receptor heating device also includes a flame heating device.

5. The device for detecting and preparing short-circuit faults of DC wires and cables according to claim 4, characterized in that: The flame heating device is a Venturi burner.

6. The device for detecting and preparing short-circuit faults of DC wires and cables according to claim 4, characterized in that: The control experiment receptor heating device also includes a high temperature environment control device.

7. The device for detecting and preparing short-circuit faults of DC wires and cables according to claim 6, characterized in that: The high temperature environment control device is a muffle furnace.

8. The device for detecting and preparing short-circuit faults of DC wires and cables according to claim 1, characterized in that: The DC power supply control cabinet is provided with a battery, a battery charging module and an AC input switch of the charging module. External AC power is connected to the battery through the AC input switch of the charging module and the battery charging module. The wire and cable heating unit includes a DC output switch. The battery is connected to the experimental current output module through the DC output switch.

9. The device for detecting and preparing short-circuit faults of DC wires and cables according to claim 1, characterized in that: The DC power supply control cabinet is provided with an industrial computer display, an industrial computer keyboard and mouse, and an industrial computer main chassis. The industrial computer display and the industrial computer keyboard and mouse are connected to the industrial computer main chassis, and the industrial computer main chassis is electrically connected to the experimental current output module.

10. The device for detecting and preparing short-circuit faults of DC wires and cables according to claim 1, characterized in that: The DC power supply control cabinet is provided with an experiment start button, an experiment stop button and a main power emergency stop button.

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