High-voltage cable electrified combustion device and system

Abstract

The invention discloses a high-voltage cable live-line combustion device and system, and belongs to the technical field of cable combustion tests.The high-voltage cable live-line combustion device comprises a shell internally provided with a containing cavity; the fixing frame is arranged in the shell, and the fixing frame is used for fixing a cable; the electric arc generator is arranged in the shell, the electric arc generator is used for generating an electric arc, and the electric arc is used for igniting the skin of the cable. Combustible gas ignition is replaced by arc generator ignition, so that external interference is reduced; by arranging the voltage source, the current source and the variable resistor, the fault condition of the cable is simulated more truly, the influence of voltage and current in the cable combustion process is reflected, and the control precision is higher.

Description

Technical Field

[0001] The invention relates to the technical field of cable combustion testing, in particular to a high-voltage cable live combustion device and system. Background Art

[0002] The study of the combustion and spread mechanism of high-voltage cables is the theoretical basis for monitoring, early warning, and fire response and firefighting. At present, the research on cable fires in China started relatively late, especially in the case of live cable fires. Due to the high voltage level and large load current of high-voltage cables, it is difficult to fully simulate the operating conditions of high-voltage cables. The current experimental research on cable fires often ignores the influence of voltage and current on the cable combustion process. Therefore, there is an urgent need for a power cable live combustion test platform that can accurately simulate the live combustion process of high-voltage cables and provide support for the early warning response and emergency disposal of live high-voltage cable fires.

[0003] In existing devices, the insulation layer is mostly ignited by flame spraying. During the process, the fire is difficult to control and the flame will interfere with the operator's vision, making it difficult to effectively monitor changes during the experiment. At the same time, since most of the experiments are open space experiments, it is difficult to effectively collect the combustion gas, which will cause certain errors in the experimental results and increase the risk of harmful gases being released into the atmosphere. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the first object of the present invention is to provide a high-voltage cable live burning device that can replace the ignition of the cable skin through the combustion of combustible gas, thereby reducing external interference.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-voltage cable live burning device, comprising a shell having a cavity inside; a fixing frame arranged in the shell, the fixing frame being used to fix the cable; an arc generator arranged in the shell, the arc generator being used to generate an arc, and the arc is used to ignite the surface of the cable.

[0008] As a preferred solution of the high-voltage cable live burning device of the present invention, wherein: the cable is horizontally arranged; the arc generator includes a first electric rod and a second electric rod, the first electric rod and the second electric rod are both vertically arranged, and the first electric rod and the second electric rod are respectively arranged on both sides of the cable, and the arc generated between the first electric rod and the second electric rod is used to ignite the cable skin.

[0009] As a preferred solution of the high-voltage cable live burning device of the present invention, the distance between the center of the cable A and the inner bottom wall of the shell is defined as D, the distances between the top of the first electric rod and the second electric rod and the inner bottom wall of the shell are L1 and L2 respectively, and the radius of the cable is r, wherein Dr≤L1≤D+r, Dr≤L2≤D+r.

[0010] As a preferred solution of the high-voltage cable live combustion device of the present invention, wherein: the distance L1 between the top of the first electric rod and the inner bottom wall of the shell is greater than or equal to the distance L2 between the top of the second electric rod and the inner bottom wall of the shell.

[0011] As a preferred solution of the high-voltage cable live combustion device of the present invention, wherein: the first electric rod and the second electric rod are both cylindrical in shape.

[0012] As a preferred solution of the high-voltage cable live combustion device of the present invention, the fixing frame includes a support rod arranged in the shell, and an annular sleeve arranged on the support rod, the annular sleeve is used to accommodate and fix the cable, and a spring is also arranged on the inner wall of the annular sleeve, and the spring is in conflict with the cable.

[0013] As a preferred embodiment of the high-voltage cable live combustion device of the present invention, it also includes an air pump and a smoke analysis component connected to the shell pipeline, the air pump is used to transport gas into the shell, and the smoke produced by igniting the cable skin flows to the smoke analysis component, and the smoke analysis component is used to analyze the smoke produced by igniting the cable skin.

[0014] The second object of the present invention is to provide a high-voltage cable live combustion system, which can improve the simulation authenticity, fully understand the influence of voltage and current in the cable combustion process, and have higher control accuracy.

[0015] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-voltage cable live combustion system, comprising the above-mentioned high-voltage cable live combustion device, and a voltage source, which is electrically connected to the first end A of the cable A, a voltmeter is provided on the path between the voltage source and the cable A, and the first end A of the cable A is grounded; a current source, comprising a first loop, the first loop is electrically connected to both the first end A and the second end A of the cable A, and a first ammeter is provided on the path between the current source and the first end A of the cable A.

[0016] As a preferred solution of the high-voltage cable live combustion system of the present invention, it also includes a second circuit, which is electrically connected to the side wall and the second end A of the cable A, and a second ammeter is provided on the path between the current source and the second end A of the cable A.

[0017] As a preferred solution of the high-voltage cable live combustion system of the present invention, it also includes a variable resistor, a mounting hole is provided on the cable A, the mounting hole penetrates the skin of the cable A, the variable resistor is in contact with the core of the cable A through the mounting hole, and the second circuit is connected to the variable resistor.

[0018] The beneficial effects of the present invention are as follows: the ignition of the combustible gas is replaced by the ignition of the arc generator, thereby reducing external interference; by setting the voltage source, the current source and the variable resistor, the fault condition of the cable is more realistically simulated, reflecting the influence of the voltage and current in the cable combustion process, and the control accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative labor. Among them:

[0020] Figure 1 This is the internal structure diagram of the high-voltage cable live combustion device.

[0021] Figure 2 This is a structural diagram of the fixing frame of the high-voltage cable live combustion device.

[0022] Figure 3 This is the structural diagram of the high-voltage cable live combustion device.

[0023] Figure 4 This is the connection diagram of the high voltage cable live combustion system. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1

[0029] Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, provides a high-voltage cable live combustion device, including a shell 100, a fixing frame 200 and an arc generator 300; the shell 100 is used to install the fixing frame 200 and the arc generator 300, the fixing frame 200 is used to fix the cable A, and the arc generator 300 ignites the skin of the cable A by generating an arc.

[0030] Specifically, a cavity 101 is provided inside the shell 100, and the cavity 101 is used to accommodate a fixing frame 200 and an arc generator 300; the fixing frame 200 is arranged in the shell 100, and the fixing frame 200 is used to fix the cable A; the arc generator 300 is arranged in the shell 100, and the arc generator 300 is used to generate an arc, and the arc is used to ignite the skin of the cable A.

[0031] The arc generator 300 is used to replace the existing combustible gas to ignite the surface of cable A. Arc ignition does not involve flammable and explosive external gases, thereby reducing safety risks during the experiment. Arc ignition is closer to the ignition method during actual cable faults, because cable A faults are often accompanied by the generation of arcs. Arc ignition can simulate the ignition conditions caused by electrical faults in cable A during actual operation, and more realistically reflect the combustion behavior of cable A under power. Ignition using external combustion gas may introduce additional variables, such as gas type, purity and flow rate, which may affect the experimental results. Arc ignition does not involve additional gas, so the interference of these external variables on the experimental results can be reduced, making the experimental results more accurate and reliable. In addition, due to the controllability of arc ignition, experimental conditions are easier to replicate, thereby improving the repeatability of experimental data.

[0032] Example 2

[0033] See also Figure 1 to Figure 3 , which is the second embodiment of the present invention, and this embodiment is based on embodiment 1.

[0034] It is worth noting that the arc shape of Jacob's ladder used in the prior art is approximately an "inverted V", and the arc is simulated by two rectangular blocks with intersecting tops. Although it can ignite the skin of cable A, it does not truly simulate the arc fault situation of cable A in actual operation, and is not suitable for the high-voltage cable live burning device of the present invention.

[0035] Specifically, the cable A is arranged horizontally; the arc generator 300 includes a first electric rod 301 and a second electric rod 302, both of which are arranged vertically, and the first electric rod 301 and the second electric rod 302 are arranged on both sides of the cable A respectively, and the arc generated between the first electric rod 301 and the second electric rod 302 is used to ignite the surface of the cable A. The relative position of the first electric rod 301 and the second electric rod 302 and the cable A is closer to the arc shape when the actual cable A fails, so the arc fault situation of the cable A in actual operation can be simulated more realistically. And this arrangement makes the shape and position of the arc more consistent, and the experiment using the first electric rod 301 and the second electric rod 302 may have better repeatability.

[0036] Preferably, the distance between the center of the cable A and the inner bottom wall of the housing 100 is defined as D, the distances between the tops of the first electric rod 301 and the second electric rod 302 and the inner bottom wall of the housing 100 are L1 and L2 respectively, and the radius of the cable A is r, wherein Dr≤L1≤D+r, Dr≤L2≤D+r. The alignment of the first electric rod 301 and the second electric rod 302 with the outline of the cable A is the most ideal configuration, because it can ensure that the arc acts directly and evenly on the cable A, providing a stable and uniform thermal effect, and helping to accurately simulate cable fault conditions.

[0037] Preferably, the distance L1 between the top of the first electric rod 301 and the inner bottom wall of the shell 100 is greater than the distance L2 between the top of the second electric rod 302 and the inner bottom wall of the shell 100. That is, the first electric rod 301 and the second electric rod 302 are staggered in the vertical direction, and the first electric rod 301 and the second electric rod 302 of different heights can adapt to cables A of different sizes and shapes, providing greater flexibility. The first electric rod 301 and the second electric rod 302 of different heights can simulate the arc behavior of the cable A under different height difference conditions, which is helpful to study the diversified arc faults of the cable A in practical applications.

[0038] Preferably, the first electric rod 301 and the second electric rod 302 are both cylindrical in shape. It is worth noting that, due to the characteristics of the electric field lines, the electric field lines point from the high-voltage area to the low-voltage area, and the electric potential gradually decreases along the direction of the electric field lines. Due to the symmetry of the cylindrical first electric rod 301 and the second electric rod 302, the electric field lines are more evenly distributed around the electric rods, which helps to generate a uniform electric field between the first electric rod 301 and the second electric rod 302. This helps to generate a more uniform and stable arc on the cable A, thereby more accurately simulating the arc fault of the cable A in actual operation.

[0039] In addition, the cylindrical first electric rod 301 and the second electric rod 302 can provide a more concentrated heat source, making the thermal effect of the insulation material of the cable A more concentrated and controllable, which is helpful for studying the response of the cable A under specific thermal stress. The geometric shape of the cylindrical first electric rod 301 and the second electric rod 302 helps to reduce the area of ​​electric field concentration, which is compared with the "inverted V" arc, which may produce electric field concentration near the apex of the arc, resulting in arc instability.

[0040] The arcs generated by the cylindrical first electric rod 301 and the second electric rod 302 are more stable because the uniformity of the electric field distribution reduces the possibility of arc drift and flicker. This stability is crucial for simulating arc faults of cable A in actual operation, because actual cable A faults usually involve stable arc discharges.

[0041] In an "inverted V" shaped arc, the electric field lines may be concentrated at the edge of the arc, resulting in an edge effect. However, the cylindrical first electric rod 301 and the second electric rod 302 can reduce this edge effect due to their symmetry, making the electric field distribution more uniform.

[0042] Example 2

[0043] This is the second embodiment of the present invention, which is basically the same as the first embodiment, except that the distance L1 between the top of the first electric rod 301 and the inner bottom wall of the shell 100 is equal to the distance L2 between the top of the second electric rod 302 and the inner bottom wall of the shell 100. The equal height of the first electric rod 301 and the second electric rod 302 provides a symmetrical electric field distribution, which helps to generate a stable and uniform arc. In multiple experiments, the equal height of the first electric rod 301 and the second electric rod 302 helps to maintain the consistency of experimental conditions, thereby improving the repeatability of the experiment.

[0044] Example 4

[0045] See also Figure 1 and Figure 4 , which is the fourth embodiment of the present invention, and this embodiment is based on embodiment 1 or embodiment 2.

[0046] Specifically, the voltage source 600 is electrically connected to the first end A1 of the cable A, a voltage meter 601 and a fuse switch 602 are provided on the path between the voltage source 600 and the cable A, and the first end A1 of the cable A is grounded. The current source 700 includes a first loop 701, the first loop 701 is electrically connected to both the first end A1 and the second end A2 of the cable A, and a first ammeter 702 is provided on the path between the current source 700 and the first end A1 of the cable A.

[0047] Preferably, it further includes a second loop 703, which is electrically connected to the side wall of the cable A and the second end A2, and a second ammeter 704 is provided on the path between the current source 700 and the second end A2 of the cable A.

[0048] Furthermore, it also includes a variable resistor 705. A mounting hole is provided on the cable A, and the mounting hole penetrates the skin of the cable A. The variable resistor 705 contacts the core of the cable A through the mounting hole, and the second loop 703 is connected to the variable resistor 705.

[0049] Working principle: Connect the test voltage source 600, fuse switch 602, and voltmeter 601, and connect the outgoing line of the voltage source 600 to the first end A1 of the cable A; close the grounding switch; turn on the voltage source 600, observe the value of the voltmeter, and adjust the test voltage to the required value; turn on the first electric rod 301 and the second electric rod 302, and set the discharge time according to actual needs; during the test, observe the tripping state of the fuse switch 602 and the value changes of the voltmeter 601 and keep records. The tripping of the fuse switch 602 means that the insulation of the cable A has failed and broken down.

[0050] A further live fire spread test includes the following steps: connect the voltage source 600, the fuse switch 602, and the voltmeter 601, and connect the outgoing line of the voltage source 600 to the first end A1 of the cable A; connect the first loop 701 of the current source 700 and the first ammeter 702, and connect the outgoing line of the first loop 701 to the first end A1 and the second end A2 of the cable A; turn on the grounding switch; turn on the voltage source 600 and the current source 700, adjust the test voltage and current to the required sizes, turn on the first electric rod 301 and the second electric rod 302, and set the fire supply time according to actual needs; observe the fire spread process of the cable A during the test, and record the fire spread speed, temperature distribution, smoke composition and other parameters during the test; all power supplies can be disconnected to conduct a non-energized fire spread test under external electrical breakdown conditions, and compared with the energized test, the influence of voltage and current on the cable combustion process can be explored.

[0051] A further short-circuit heating and ignition test includes the following steps: installing the variable resistor 705 and the temperature sensor at the installation hole of the cable, so that the variable resistor 705 is in good contact with the core of the cable A through the installation hole, and both sides of the variable resistor 705 are in good contact with the insulation layer and sheath of the cable; connecting the second loop 703 and the second ammeter 704 of the current source 700, the output line of the second loop 703 is connected to the variable resistor 705, and the input line of the second loop 703 is connected to the second end A2 of the cable A; adjusting the variable resistor 705 to the required appropriate resistance value; turning on the current source 700, and adjusting the test current to the required size; during the test, observing the temperature change of the variable resistor 705, the heating and ignition of the insulation layer and sheath of the cable A around the variable resistor 705, the ignition and fire spread of the cable A, the temperature propagation process and distribution, the smoke composition and other parameters, and keeping records.

[0052] Based on the above, the beneficial effects of the present invention are:

[0053] 1. By setting up an arc generator 300 to replace the existing combustible gas ignition, the arc ignition can simulate the ignition conditions caused by electrical faults in the actual operation of the cable A, and more realistically reflect the combustion behavior of the cable A in the energized state. The first electric rod 301 and the second electric rod 302 are vertically arranged, respectively arranged on both sides of the cable A, and the first electric rod 301 and the second electric rod 302 are flush with the outline of the cable A, and the shape of the first electric rod 301 and the second electric rod 302 is cylindrical, instead of the inverted V-shaped arrangement, so that the arc is more uniform and stable, thereby more accurately simulating the arc fault of the cable A in actual operation.

[0054] 2. By setting up a high-voltage cable live combustion system, live fire spread test and short-circuit heating ignition test can be carried out to reflect the influence of voltage and current on the cable combustion process.

[0055] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0056] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0057] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high voltage cable live combustion device, characterized in that: include: A housing (100) having a cavity (101) disposed therein; A fixing frame (200) is arranged in the housing (100), and the fixing frame (200) is used to fix the cable (A); An arc generator (300) is arranged in the housing (100), and the arc generator (300) is used to generate an arc, and the arc is used to ignite the skin of the cable (A).

2. The high voltage cable live combustion device according to claim 1, characterized in that: The cable (A) is arranged horizontally; the arc generator (300) comprises a first electric rod (301) and a second electric rod (302), the first electric rod (301) and the second electric rod (302) are both arranged vertically, and the first electric rod (301) and the second electric rod (302) are respectively arranged on both sides of the cable (A), and the arc generated between the first electric rod (301) and the second electric rod (302) is used to ignite the surface of the cable (A).

3. The high voltage cable live combustion device according to claim 2, characterized in that: The distance between the center of the cable (A) and the inner bottom wall of the shell (100) is defined as D, the distances between the tops of the first electric rod (301) and the second electric rod (302) and the inner bottom wall of the shell (100) are L1 and L2 respectively, and the radius of the cable (A) is r, wherein Dr≤L1≤D+r, Dr≤L2≤D+r.

4. The high voltage cable live combustion device according to claim 2 or 3, characterized in that: The distance L1 between the top of the first electric rod (301) and the inner bottom wall of the shell (100) is greater than or equal to the distance L2 between the top of the second electric rod (302) and the inner bottom wall of the shell (100).

5. The high voltage cable live combustion device according to claim 4, characterized in that: The first electric rod (301) and the second electric rod (302) are both cylindrical in shape.

6. The high voltage cable live combustion device according to claim 1, characterized in that: The fixing frame (200) comprises a support rod (201) arranged in a housing (100), and an annular sleeve (202) arranged on the support rod (201), the annular sleeve (202) being used to accommodate and fix the cable (A), and a spring (203) is further arranged on the inner wall of the annular sleeve (202), the spring (203) being in contact with the cable (A).

7. The high voltage cable live combustion device according to claim 1, characterized in that: It also includes an air pump (400) and a smoke analysis unit (500) connected to the housing (100) through a pipeline. The air pump (400) is used to transport gas into the housing (100). Smoke generated by igniting the skin of the cable (A) flows to the smoke analysis unit (500). The smoke analysis unit (500) is used to analyze the smoke generated by igniting the skin of the cable (A).

8. A high voltage cable live combustion system, characterized in that: include: A high voltage cable live combustion device as claimed in any one of claims 1 to 7, and A voltage source (600) is electrically connected to the first end (A1) of the cable (A); a voltage meter (601) is provided on the path between the voltage source (600) and the cable (A); and the first end (A1) of the cable (A) is grounded; A current source (700) comprises a first loop (701), wherein the first loop (701) is electrically connected to a first end (A1) and a second end (A2) of a cable (A), and a first ammeter (702) is provided on the path between the current source (700) and the first end (A1) of the cable (A).

9. The high voltage cable live combustion system according to claim 8, characterized in that: It also includes a second loop (703), the second loop (703) is electrically connected to the side wall and the second end (A2) of the cable (A), and a second ammeter (704) is provided on the path between the current source (700) and the second end (A2) of the cable (A).

10. The high voltage cable live combustion system according to claim 8, characterized in that: It also includes a variable resistor (705), the cable (A) is provided with a mounting hole, the mounting hole penetrates the skin of the cable (A), the variable resistor (705) contacts the wire core of the cable (A) through the mounting hole, and the second loop (703) is connected to the variable resistor (705).

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