A device for preparing overcurrent-induced short-circuit traces

Abstract

The present invention discloses a device for preparing overcurrent-induced short-circuit traces, and relates to the technical field of electrical fire fault simulation and electrical fault trace preparation. It includes an experimental circuit module, a data measurement and recording module, and a load circuit. The experimental circuit module is used to provide an alternating current to at least the experimental wire to simulate an overcurrent fault; the experimental wire is used to simulate the circuit in the process of a real overcurrent fault; the experimental wire will generate heat when an overcurrent fault occurs, and the heat will melt the insulation layer and the sheath wire of the experimental wire to cause a short circuit fault and form a short circuit trace; the data measurement and recording module is used to measure and store the voltage data and current data at the moment when the overcurrent fault of the experimental wire occurs; the load circuit is used to perform multi-stage adjustment on the size of the alternating current flowing through the experimental circuit module. The present invention realizes the multi-stage adjustment of the overcurrent in the experimental wire, and the preparation and recording of the short circuit trace induced by the overcurrent fault of the experimental wire under alternating current.

Description

Technical Field

[0001] The invention relates to the technical field of electrical fire fault simulation and electrical fault trace preparation, and in particular to an overcurrent induced short circuit trace preparation device. Background Art

[0002] When an overcurrent fault occurs in a conductor, the current passing through the conductor far exceeds its rated current value, and the conductor core continues to heat up and rise in temperature. When it rises to a certain temperature, the conductor insulation layer thermally decomposes and gradually fails, leading to arcing, melting, and combustion, which may ignite surrounding combustibles and cause a fire accident.

[0003] At present, the research on conductor overcurrent faults mainly focuses on the fault process and characteristics of single-core conductors under direct current, so most of the equipment is a DC overcurrent simulation device. There are few devices that can adjust the current in multiple stages for studying conductor overcurrent faults under alternating current at home and abroad. Based on this, there is a need for a preparation device that can prepare, record and study the short-circuit traces induced by conductor overcurrent faults under alternating current and can adjust the current in multiple stages. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a device for preparing overcurrent-induced short-circuit traces, which not only realizes multi-level regulation of overcurrent in the experimental wire, but also realizes the preparation and recording of short-circuit traces induced by overcurrent faults of the experimental wire under alternating current.

[0005] To achieve the above purpose, the embodiment of the present invention provides the following solution:

[0006] An overcurrent induced short circuit trace preparation device, used to reproduce the overcurrent fault occurrence process, comprising:

[0007] The experimental circuit module is used to provide an alternating current to the experimental wire to simulate an overcurrent fault; the experimental wire is used to simulate a circuit in the process of a real overcurrent fault; the experimental wire will generate heat when an overcurrent fault occurs, and the heat will melt the insulation layer and the sheath wire of the experimental wire to cause a short circuit fault and form a short circuit trace;

[0008] A data measurement and recording module, connected to the experimental circuit module, for measuring and storing voltage data and current data at the moment when an overcurrent fault occurs in the experimental conductor;

[0009] The load circuit is connected to the experimental circuit module and is used to perform multi-stage adjustment on the magnitude of the alternating current flowing through the experimental circuit module.

[0010] Optionally, the load circuit includes:

[0011] N load branches, used to adjust the magnitude of the AC current in the experimental circuit module; N is a positive integer greater than 2; each of the load branches includes a resistor; the N load branches are connected in parallel;

[0012] An air switch connected to the load shunt and used for overcurrent protection of the load shunt;

[0013] The load access terminal is connected to the experimental circuit module and the air switch respectively, and is used to connect the load shunt to the experimental circuit module.

[0014] Optionally, each of the load branches further includes a branch switch, and the branch switch is used to control the on and off of the load branch.

[0015] Optionally, different on-off state combinations of the N load shunt switches correspond to different levels of alternating current.

[0016] Optionally, the data measurement and recording module includes:

[0017] A voltmeter, used to measure the voltage value at the moment when an overcurrent fault occurs in the experimental circuit;

[0018] The first ammeter is used to measure the current value at the moment when an overcurrent fault occurs in the experimental circuit.

[0019] Optionally, the data measurement and recording module further includes:

[0020] A computer is connected to the voltage meter and the current meter respectively; the computer is used to store the voltage value and the current value.

[0021] Optionally, the data measurement and recording module further includes:

[0022] Power input terminal, used to connect AC power;

[0023] A power input main switch, connected to the power input terminal, for controlling whether the data measurement and recording module is powered on;

[0024] The power output terminal is connected to the power input main switch and the experimental circuit module respectively, and is used to provide alternating current to the experimental circuit module.

[0025] Optionally, the control end of the power input main switch is connected to the computer.

[0026] Optionally, the overcurrent induced short circuit trace preparation device further includes:

[0027] The second ammeter is connected to the experimental circuit module and the load circuit respectively, and is used to measure the total current in the load circuit.

[0028] Optionally, the experimental circuit module includes:

[0029] A first circuit breaker, connected to one end of the experimental wire and the data measurement and recording module respectively, and used to disconnect the connection between the experimental wire and the data measurement and recording module;

[0030] The second circuit breaker is connected to the other end of the experimental wire and the load circuit respectively, and is used to disconnect the connection between the experimental wire and the load circuit.

[0031] According to the specific embodiments provided by the present invention, the following technical effects are disclosed:

[0032] The embodiment of the present invention provides a device for preparing an overcurrent-induced short-circuit trace, and the device includes an experimental circuit module, a data measurement and recording module, and a load circuit. The load circuit can adjust the size of the alternating current flowing through the experimental circuit module in multiple stages, and the experimental circuit module provides alternating current for the experimental wire. Therefore, the load circuit and the experimental wire are connected in series to induce an overcurrent short-circuit fault. When an overcurrent fault occurs in the experimental wire, a large amount of heat will be generated, and the heat will melt the insulation layer and the sheath wire of the experimental wire to cause a short-circuit fault. The short-circuit fault causes the experimental wire to burn and melt, forming a burning melt mark, thereby reproducing the occurrence process of the overcurrent fault melt mark (that is, reproducing the occurrence process of the overcurrent-induced short-circuit trace). At the same time, the data measurement and recording module measures and stores the voltage data and current data when the overcurrent fault of the experimental wire occurs. The device for preparing an overcurrent-induced short-circuit trace provided by the present invention not only realizes the multi-stage adjustment of the overcurrent in the experimental wire, but also realizes the preparation and recording of the short-circuit trace induced by the overcurrent fault of the experimental wire under alternating current. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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.

[0034] Figure 1 A schematic structural diagram of an overcurrent induced short circuit trace preparation device provided by an embodiment of the present invention;

[0035] Figure 2 A connection diagram of a device for preparing an overcurrent-induced short-circuit trace provided by an embodiment of the present invention;

[0036] Figure 3 A connection relationship diagram of a load shunt of an overcurrent induced short circuit trace preparation device provided by an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of the structure of a bracket for preparing an overcurrent-induced short-circuit trace provided by an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of the structure of a data acquisition device for preparing an overcurrent-induced short-circuit trace provided by an embodiment of the present invention;

[0039] Figure 6 A connection diagram of a load circuit of an overcurrent induced short circuit trace preparation device provided by an embodiment of the present invention;

[0040] Figure 7 A schematic structural diagram of a load box of an overcurrent induced short circuit trace preparation device provided in an embodiment of the present invention.

[0041] Explanation of symbols:

[0042] Experimental circuit module-1, first circuit breaker-11, second circuit breaker-12, data measurement and recording module-2, voltmeter-21, first ammeter-22, computer-23, power input terminal-24, power input main switch-25, power output terminal-26, load circuit-3, load branch-31, air switch-32, load access terminal-33, second ammeter-4. DETAILED DESCRIPTION

[0043] The structures and scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field can know that with the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0044] It should be noted that, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0045] The purpose of the embodiment of the present invention is to provide a device for preparing overcurrent-induced short-circuit traces to solve the problem that there are few multi-stage current-adjustable devices for studying overcurrent faults of conductors under alternating current. The embodiment of the present invention not only realizes multi-stage regulation of overcurrent in the experimental conductor, but also realizes the preparation and recording of short-circuit traces induced by overcurrent faults of the experimental conductor under alternating current.

[0046] Figure 1An exemplary structure of the above-mentioned overcurrent induced short circuit trace preparation device is shown, including an experimental circuit module 1, a data measurement and recording module 2 and a load circuit 3.

[0047] The experimental circuit module 1 is introduced in detail below.

[0048] The experimental circuit module 1 is used to provide an alternating current to the experimental wire to simulate an overcurrent fault. The alternating current can be specifically a 220-volt mains electricity. In addition, in other embodiments of the present invention, the experimental circuit module 1 can also provide a direct current to the experimental wire. Those skilled in the art can flexibly design whether the experimental circuit module 1 provides an alternating current or a direct current.

[0049] The above-mentioned experimental wire is used to simulate the circuit during the occurrence of a real overcurrent fault; the experimental wire will generate heat when an overcurrent fault occurs, and the heat will melt the insulation layer and the sheath wire of the experimental wire to cause a short circuit fault and form a short circuit mark.

[0050] In one example, the experimental wire can be a multi-core wire. Taking a multi-core wire as an example, when an overcurrent passes through the multi-core wire, the multi-core wire will generate a lot of heat, which will melt the insulation layer of each single core in the multi-core wire. After the insulation layer melts, each single core is exposed and contacts each other, causing a short circuit fault. The short circuit fault will generate more heat, causing the sheath wire of the multi-core wire to burn and form a burning mark, thereby reproducing the occurrence process of the overcurrent fault mark, that is, reproducing the occurrence process of the overcurrent-induced short circuit mark.

[0051] In an example, the experimental circuit module 1 may specifically include a first circuit breaker 11 and a second circuit breaker 12 .

[0052] See also Figure 2 The first circuit breaker 11 is connected to one end of the experimental wire and the data measurement and recording module 2 respectively, and the first circuit breaker 11 is used to disconnect the connection between the experimental wire and the data measurement and recording module 2.

[0053] The second circuit breaker 12 is connected to the other end of the experimental wire and the load circuit 3 respectively, and the second circuit breaker 12 is used to disconnect the connection between the experimental wire and the load circuit 3.

[0054] The first circuit breaker 11 and the second circuit breaker 12 may be mounted on a bracket. Figure 4 An exemplary structure of a stent is shown.

[0055] In one example, the bracket is heat-insulated, and the bracket includes a bracket arm and a bracket base. The bracket arm can slide on the bracket base to change the distance between the two bracket arms. Different distances between the two bracket arms can be used to set different experimental wire lengths according to experimental needs. When set on the bracket, the center point connection line of the first circuit breaker 11 and the second circuit breaker 12 is parallel to the horizontal plane, thereby ensuring that the experimental wire is placed horizontally.

[0056] Those skilled in the art can flexibly select a circuit breaker according to actual needs. For example, the first circuit breaker 11 or the second circuit breaker can be a NM1-125S / 3300-100A molded case circuit breaker with a maximum through current of 100A. When the current exceeds 100A, the circuit breaker tripper is disconnected and the circuit breaker disconnects the circuit.

[0057] In this way, when the current in the experimental wire exceeds 100A, the circuit breaker will disconnect the connection between the experimental wire and other devices (data measurement and recording module 2 and load circuit 3).

[0058] The data measurement and recording module 2 is described in detail below.

[0059] Still see Figure 2 The data measurement and recording module 2 includes a voltmeter 21 and a first ammeter 22 .

[0060] When an overcurrent fault occurs in the experimental wire in the experimental circuit module 1 , the voltmeter 21 measures the voltage of the experimental wire, and the first ammeter 22 measures the current of the experimental wire.

[0061] In other embodiments of the present invention, please refer to Figure 2 The data measurement and recording module 2 may further include a computer 23 .

[0062] In one example, a data acquisition card may be installed inside the computer 23, and the data acquisition card may collect the voltage value of the voltmeter 21 and the current value of the ammeter 22. The data acquisition card may collect the voltage value of the voltmeter 21 and the current value of the ammeter 22 at a frequency of 1.5×10 4 Hz, the voltage and current values ​​collected by the data acquisition card can be stored in the storage medium of the computer. Alternatively, the data card itself also has a storage function, which can store the collected voltage and current values.

[0063] In other embodiments of the present invention, please refer to Figure 2 The data measurement and recording module 2 may further include a power input terminal 24 , a power input main switch 25 and a power output terminal 26 .

[0064] In one example, the power input terminal 24 can be connected to 220V AC power (mains power). Of course, when DC power is needed, the power input terminal 24 can be connected to a DC power source.

[0065] The power input master switch 25 is connected to the power input terminal 24 , and the power input master switch 25 can be used to control whether AC / DC power passes through, that is, the power input master switch 25 determines whether the entire data measurement and recording module 2 is powered on.

[0066] The on and off of the power input main switch 25 can be controlled manually or automatically.

[0067] In one example, the control end of the main power input switch 25 may be connected to the computer 23 , and the computer 23 controls the on and off of the main power input switch 25 .

[0068] The power output terminal 26 is connected to the power input main switch 25 and the experimental circuit module 1 respectively.

[0069] The data measurement and recording module 2 may specifically be a data acquisition device. In one example, see Figure 5 The data acquisition device may be composed of a power connection part (including the aforementioned power input terminal 24, the power input main switch 25 and the power output terminal 26), and a data acquisition system (including the aforementioned voltmeter 21, the first ammeter 22 and the computer 23). For easy movement, the bottom of the data acquisition device may be provided with a pulley.

[0070] The load circuit 3 is described in detail below.

[0071] The load circuit 3 is connected to the experimental circuit module 1 , and is used to perform multi-level regulation on the magnitude of the alternating current flowing through the experimental circuit module 1 .

[0072] The load circuit 3 is equivalent to a resistor connected in the experimental circuit module 1 , and the load circuit 3 achieves the purpose of multi-level regulation of the AC current in the experimental circuit module 1 by multi-level regulation of its own resistance.

[0073] See also Figure 3 The load circuit 3 at least includes a load shunt 31. The number of the load shunts 31 may be N (greater than or equal to 2), which are used to adjust the magnitude of the AC current in the experimental circuit module; the N load shunts are connected in parallel, and each load shunt includes a resistor.

[0074] In other embodiments of the present invention, the load branch 3 may further include an air switch 32 and a load access terminal 33 .

[0075] The air switch 32 can protect the load branch 31 from overcurrent.

[0076] In one example, the air switch 32 may be a DZ47s2P63A air switch with a maximum through current of 63 A. When the current exceeds 63 A, the air switch 32 disconnects the circuit. The load access terminal 33 connects the load shunt 31 to the experimental circuit module 1 .

[0077] In practical applications, the load circuit 3 may be specifically disposed in a load box.

[0078] Figure 6 An exemplary structure of an overcurrent induced short circuit trace preparation device is shown, which includes an experimental circuit module 1, a data acquisition device and a load box. The number of load shunts 31 in the load box is specifically 13, each load shunt 31 includes a resistor and a shunt switch, and the 13 load shunts 31 are connected in parallel. The 13 load shunts 31 can be numbered as 1, 2, 3...11, 12, 13, and the resistors in each load shunt are Figure 6 The resistor is represented by 1R-13R and the branch switch is represented by 1K-13K.

[0079] Among them, 12K and 13K can specifically be DZ47s2P32A type shunt switches. When the current passing through exceeds 32A, the DZ47s2P32A type shunt switch will be disconnected.

[0080] The resistance values ​​of the resistors in the load branch 31 where 12K and 13K are located are 22 ohms and 11 ohms respectively.

[0081] Except for 12K and 13K, the shunt switches of the other 11 load shunts 31 can specifically be DZ47s1P4A shunt switches. When the current in any of the 11 load shunts 31 exceeds 4A, the DZ47s1P4A shunt switch in the corresponding shunt will be disconnected, and the resistance value of the 11 load shunts 31 is 73 ohms.

[0082] When the shunt switches of all load shunts 31 are closed, the maximum current can be adjusted to 63A; when the shunt switches of some load shunts 31 are closed, the minimum current can be adjusted to 3A.

[0083] According to the needs, by opening and closing the branch switches of different numbers and different load branches 31 to achieve different on-off state combinations, corresponding alternating currents of different levels can be obtained.

[0084] The power of the above load box can be 20kW.

[0085] Figure 7 An exemplary front view of the load box is shown, wherein the aforementioned air switch 32 and load access terminal 33 are both arranged on the surface of the load box, and at the same time, the branch switches 1K-13K are partially exposed to facilitate the combination of the on and off states of the branch switches.

[0086] It can be seen that in the overcurrent induced short circuit trace preparation device provided in the embodiment of the present invention, the load circuit 3 can adjust the size of the AC current flowing through the experimental circuit module 1 in multiple stages, and the experimental circuit module 1 provides AC current for the experimental wire. Therefore, the load circuit 3 and the experimental wire can cooperate to induce an overcurrent short circuit fault. When an overcurrent fault occurs in the experimental wire, a large amount of heat will be generated, and the heat will melt the insulation layer and the sheath wire of the experimental wire to cause a short circuit fault. The short circuit fault causes the experimental wire to burn and melt, forming a burning melt mark, thereby reproducing the occurrence process of the overcurrent fault melt mark (that is, reproducing the occurrence process of the overcurrent induced short circuit trace). At the same time, the data measurement and recording module 2 measures and stores the voltage data and current data when the overcurrent fault of the experimental wire occurs. The embodiment of the present invention not only realizes the multi-stage regulation of the overcurrent in the experimental wire, but also realizes the preparation and recording of the short circuit trace induced by the overcurrent fault of the experimental wire under AC power.

[0087] In other embodiments of the present invention, the above device may further include a second ammeter 4 .

[0088] Still see Figure 2 The second ammeter 4 is connected to the experimental circuit module 1 and the load circuit 3 respectively, and is used to measure the size of the AC current or the DC current in the load circuit 3.

[0089] In other embodiments of the present invention, the second ammeter 4 may also be connected to the computer 23 , and a data acquisition card inside the computer 23 may acquire the current value of the second ammeter 4 and store it in the computer 23 .

[0090] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0091] This article uses specific examples to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only used to help understand the methods and core ideas of the embodiments of the present invention. At the same time, for those skilled in the art, according to the ideas of the embodiments 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 embodiments of the present invention.

Claims

1. A device for preparing overcurrent induced short circuit traces, characterized in that: Used to reproduce the overcurrent fault process, including: The experimental circuit module is used to provide an alternating current to at least the experimental wire to simulate an overcurrent fault; the experimental wire is used to simulate a circuit in the process of a real overcurrent fault; the experimental wire will generate heat when an overcurrent fault occurs, and the heat will melt the insulation layer and the sheath wire of the experimental wire to cause a short circuit fault and form a short circuit trace; A data measurement and recording module, connected to the experimental circuit module, for measuring and storing voltage data and current data at the moment when an overcurrent fault occurs in the experimental conductor; A load circuit, connected to the experimental circuit module, for performing multi-stage adjustment on the magnitude of the alternating current flowing through the experimental circuit module; The load circuit comprises: N load branches, used to adjust the magnitude of the AC current in the experimental circuit module; N is a positive integer greater than 2; each of the load branches includes a resistor; the N load branches are connected in parallel; An air switch connected to the load shunt and used for overcurrent protection of the load shunt; A load access terminal, connected to the experimental circuit module and the air switch respectively, for connecting the load shunt to the experimental circuit module; Each of the load shunts further comprises a shunt switch, and the shunt switch is used to control the on and off of the load shunt; Different on-off state combinations of the N load shunt switches correspond to different levels of alternating current.

2. The overcurrent induced short circuit trace preparation device according to claim 1, characterized in that: The data measurement and recording module includes: A voltmeter, used to measure the voltage value at the moment when an overcurrent fault occurs in the experimental circuit; The first ammeter is used to measure the current value at the moment when an overcurrent fault occurs in the experimental circuit.

3. The overcurrent induced short circuit trace preparation device according to claim 2, characterized in that: The data measurement and recording module also includes: A computer is connected to the voltage meter and the current meter respectively; the computer is used to store the voltage value and the current value.

4. The overcurrent induced short circuit trace preparation device according to claim 3, characterized in that: The data measurement and recording module also includes: Power input terminal, used to connect AC power; A power input main switch, connected to the power input terminal, for controlling whether the data measurement and recording module is powered on; The power output terminal is connected to the power input main switch and the experimental circuit module respectively, and is used to provide alternating current to the experimental circuit module.

5. The overcurrent induced short circuit trace preparation device according to claim 4, characterized in that: The control end of the power input main switch is connected to the computer.

6. The overcurrent induced short circuit trace preparation device according to claim 1, characterized in that: Also includes: The second ammeter is connected to the experimental circuit module and the load circuit respectively, and is used to measure the total current in the load circuit.

7. The overcurrent induced short circuit trace preparation device according to claim 1, characterized in that: The experimental circuit module includes: A first circuit breaker, connected to one end of the experimental wire and the data measurement and recording module respectively, and used to disconnect the connection between the experimental wire and the data measurement and recording module; The second circuit breaker is connected to the other end of the experimental wire and the load circuit respectively, and is used to disconnect the connection between the experimental wire and the load circuit.

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