Test device for cable overheating test

Abstract

The invention relates to a cable overheating test device, which relates to a cable overheating detector, and is characterized in that a weight pressure cavity, a skin damage cavity, an end connecting cavity, a wiring terminal cavity, a branching cavity, a moist cavity and a hot cavity are respectively arranged in an experiment box, and two ends of the upper part of each cavity in the experiment box are respectively provided with a semicircular sealing ring; sealing strips are respectively arranged at the periphery of the upper part of each cavity except the semicircular sealing ring; experiment box covers for sealing are respectively arranged at the upper parts of the wet cavity and the hot cavity; a humidity sensor and a water mist generator are arranged in the humid cavity, and a heat sensor and a heater are arranged in the hot cavity; a temperature sensor is arranged in the middle of each cavity, the temperature sensors are connected with digital temperature displays which are matched with the temperature sensors in number and provided with acquisition cards through data lines C, and the digital temperature displays are connected with the upper computer through data lines A; various common problems of the cable in actual use can be experimented, the quality problem of the cable is obtained through experimental data, and technical improvement is provided for solving the problem.

Description

Technical Field

[0001] The present invention relates to an apparatus for detecting overheating of cables, and more specifically to a test device for overheating of cables. Background Art

[0002] Cables are carriers for transmitting electric energy, and their quality is crucial for the stable operation of the entire power system. Due to some quality or various subsequent problems in cables, overheating may occur during operation. Among them, an important problem is cable overload, that is, when the current exceeds the rated capacity of the cable, the heat generated by the resistance increases, leading to an increase in the cable temperature. The occurrence of this problem is due to improper design on the one hand and overheating of the cable caused by excessive equipment connection on the other hand. There are also cables with inconsistent markings and actual specifications (commonly known as non-standard cables); poor contact, loosening or oxidation of the connection points of the cable (such as joints or terminals) will increase the resistance, and significant local heating occurs when the current passes through, leading to overheating of the cable; poor heat dissipation, the cable is installed in a closed space or the cable is covered or the surrounding ambient temperature is too high, resulting in blocked heat dissipation, and heat accumulation leads to a temperature rise; heat generation phenomenon of the cable during operation caused by the cable conductor resistance not meeting the requirements; improper cable selection, the conductor cross-section is too small to cope with the overload demand during operation, resulting in an imbalance between heat generation and heat dissipation after long-term use; improper installation method, the cable arrangement is too dense, resulting in poor ventilation and heat dissipation effects, or being too close to other heat sources, affecting normal heat dissipation; heat generation phenomenon during operation due to poor phase insulation performance of the cable, resulting in a small insulation resistance; heat generation phenomenon caused by damage to the cable skin during the cable erection process; heat generation phenomenon caused by unqualified cable sheaths in a humid environment; mild cable overheating will accelerate cable aging, and severe cable overheating will lead to cable fire; currently, most of the cables used in new construction projects or renovation projects are based on the data provided by the manufacturer, and it is necessary to conduct secondary simulation tests on the cables. Summary of the Invention

[0003] The object of the present invention is to disclose a test device for overheating of cables based on existing deficiencies. The present invention can conduct experiments on various common problems of cables in actual use, obtain the quality problems of the cables through experimental data, and provide technical improvements for solving the problems.

[0004] In order to achieve the object of the present invention, the following technical solutions are disclosed in this application: A test device for cable overheating, which is respectively provided with a heavy object pressure chamber, an epidermis damage chamber, a terminal connection chamber, a wiring terminal chamber, a tapping chamber, a humidity chamber and a heat chamber inside the experimental box. At both ends of the upper part of each chamber inside the experimental box, semi-circular sealing rings are respectively provided. Around the upper part of each chamber except the semi-circular sealing rings, sealing strips are respectively provided. At the upper parts of the humidity chamber and the heat chamber, experimental box covers for sealing are respectively provided; a humidity sensor and a water mist generator are arranged inside the humidity chamber, and a heat sensor and a heater are arranged inside the heat chamber; temperature sensors are respectively arranged in the middle of each chamber, and the temperature sensors are connected to a digital temperature display with a matching number and a data acquisition card through data line C, and the digital temperature display is connected to the upper computer through data line A.

[0005] For the test device for cable overheating, sealing strips are respectively arranged around the lower surface of the experimental box covers of the humidity chamber and the heat chamber, and semi-circular sealing rings are respectively arranged at both ends of the experimental box covers of the humidity chamber and the heat chamber.

[0006] For the test device for cable overheating, the humidity sensor in the humidity chamber is connected to a humidity display through a data line, and the humidity display is connected to the upper computer through a data line; the water mist generator in the humidity chamber is connected to a spraying device through a pipeline, and the water mist generator is connected to the upper computer through a data line.

[0007] For the test device for cable overheating, the heat sensor in the heat chamber is connected to a heat display through a data line, and the heat display is connected to the upper computer through a data line; the heat outlet of the heater is connected to the heat chamber, and the heater is connected to the upper computer through a data line.

[0008] For the test device for cable overheating, the heater is a hot air blower or is externally connected to a hot air source through a heat-resistant pipeline.

[0009] For the test device for cable overheating, the digital temperature display is placed inside the box body.

[0010] For the test device for cable overheating, heightening plates are respectively arranged on the four sides of the heavy object pressure chamber of the experimental box.

[0011] For the test device for cable overheating, the specific using steps: Place the cable into the heavy object pressure chamber, attach the temperature sensor to the outer surface of the cable, and then bury the cable in the heavy object pressure chamber with heavy objects; place the cable with damaged outer skin in the skin damage chamber, and attach the temperature sensor to the cable; place the end-connected cable in the end connection chamber, and attach the temperature sensor to the end-connected cable; clamp the terminal cable in the terminal chamber; attach the temperature sensor to the terminal cable; clamp the Y-shaped tap cable in the semi-circular sealing ring on one side of the tap chamber and the two semi-circular sealing rings on the other side respectively; place the cable in the humidity chamber, attach the temperature sensor to the cable, install a humidity sensor and a water mist generator in the humidity chamber, and fasten the experimental box cover on the upper part of the humidity chamber; place the cable in the heat chamber, attach the temperature sensor to the cable, install a heat sensor and a heater on one side wall of the heat chamber respectively, and fasten the experimental box cover on the upper part of the heat chamber; then connect the data lines C of all the above-mentioned temperature sensors to the corresponding digital temperature displays respectively; connect one end of each cable to the power supply, and connect the other end or both ends of each cable to the electric energy release device respectively; the upper computer controls the power connection of the cable, the acquisition card of each digital temperature display receives the real-time data of the corresponding temperature sensor and transmits it to the upper computer through the acquisition card, the start of operation of the humidity sensor and the water mist generator, and the start of operation of the heat sensor and the heater, and finally further analyzes the collected data through the upper computer.

[0012] For the test device for cable overheating, the heavy objects filled in the heavy object pressure chamber below and above the cable include a mixture of stones and soil.

[0013] For the test device for cable overheating, on the outer edge surfaces near both ends of the cable experimental box, an incoming voltage collector and an outgoing voltage collector are respectively provided. The incoming I-shaped inductor and the outgoing I-shaped inductor are respectively connected to the inductor measuring instrument through the data line B, and then the inductor measuring instrument transmits the collected inductor values to the upper computer for later comparison.

[0014] Through the above disclosure, the beneficial effects of the present invention are: The test device for cable overheating described in the present invention uses temperature sensors installed on each cable to record and store the temperature changes of the cables in real time. The temperature changes of the cables in specific scenarios covered by stones and soil in the heavy object pressure chamber, as well as the temperature changes of the cables in the humid chamber at different humidities by the water mist generator, the temperature changes of the cables in the hot chamber at different heat levels by the heater, and the temperature changes of the damaged skin cables, terminal cables, and branched cables are respectively recorded and stored in real time by the temperature sensors, obtaining the actual states of the cables in various scenarios, providing effective data for the confirmation of cable quality and the improvement of connection methods; the present invention can conduct synchronous experiments on various common problems in the actual use of cables, and provide relatively real data for the use of cable labels and brands through the acquisition of experimental data, and also provide a basis for eliminating potential accidents and technological improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the experimental box of the present invention; Figure 3 is the three-dimensional structural schematic diagram of the experimental box cover of the present invention; Figure 4 is the upward three-dimensional structural schematic diagram of the lower part of the experimental box cover of the present invention; In the figure: 1, host computer; 2, cable; 3, temperature sensor; 4, data line A; 5, data line B; 6, data line C; 7, digital temperature display; 8, box body; 9, outgoing I-shaped inductor; 10, stone; 11, soil; 12, incoming I-shaped inductor; 13, heavy object pressure chamber; 14, damaged skin chamber; 15, sealing strip; 16, semi-circular sealing ring; 17, end connection chamber; 18, terminal chamber; 19, branching chamber; 20, humidity sensor; 21, humid chamber; 22, water mist generator; 23, heat sensor; 24, hot chamber; 25, heater; 26, humidity display; 27, heat display; 28, experimental box; 29, experimental box cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will describe the preferred embodiments of the present invention in detail with reference to the drawings, so as to more clearly understand the invention purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present invention, but only to explain the embodiments of the technical solution of the present invention that are not limited to one type.

[0017] Combined with the attached Figures 1 to 4The test device for cable overheating described in [reference], in the experimental box 28, there are respectively a heavy object pressure chamber 13, an outer skin damage chamber 14, a terminal connection chamber 17, a wiring terminal chamber 18, a tapping chamber 19, a humidity chamber 21 and a heat chamber 24. Among them, on the four sides of the heavy object pressure chamber 13 of the experimental box 28, there are respectively heightening plates. At both ends of the upper part of each chamber in the experimental box 28, there are respectively semi-circular sealing rings 16. Around the upper part of each chamber except the semi-circular sealing ring 16, there are respectively sealing strips 15. On the upper parts of the humidity chamber 21 and the heat chamber 24, there are respectively experimental box covers 29 for sealing; in the humidity chamber 21, there are a humidity sensor 20 and a water mist generator 22 arranged, and in the heat chamber 24, there are a heat sensor 23 and a heater 25 arranged; in the middle of each chamber, there is respectively a temperature sensor 3, and the temperature sensor 3 is connected to a digital temperature display 7 with a matching quantity and having a data acquisition card through a data line C6, and the digital temperature display 7 is connected to the upper computer 1 through a data line A4.

[0018] Further, around the lower surface periphery of the experimental box covers 29 of the humidity chamber 21 and the heat chamber 24, there are respectively sealing strips 15, and at both ends of the experimental box covers 29 of the humidity chamber 21 and the heat chamber 24, there are respectively semi-circular sealing rings 16; the humidity sensor 20 in the humidity chamber 21 is connected to a humidity display 26 through a data line, and the humidity display 26 is connected to the upper computer 1 through a data line; the water mist generator 22 in the humidity chamber 21 is connected to a spraying device through a pipeline, and the water mist generator 22 is connected to the upper computer 1 through a data line; the heat sensor 23 in the heat chamber 24 is connected to a heat display 27 through a data line, and the heat display 27 is connected to the upper computer 1 through a data line; the heat outlet of the heater 25 is connected to the heat chamber 24, and the heater 25 is connected to the upper computer 1 through a data line, and the heater 25 is a hot air blower or is externally connected to a hot air source through a heat-resistant pipeline.

[0019] Further, the digital temperature display 7 is placed in the box body 8, and in order to distinguish, the number of the corresponding chamber is set on one side of each digital temperature display 7.

[0020] The test device for cable overheating described in the present invention has the following specific use steps: A. Cable installation: Clamp the cable 2 near both ends respectively in the semi-circular sealing rings 16 on both sides of the heavy object pressure chamber 13, use weather-resistant tape to stick the temperature sensor 3 on the outer surface of the cable 2 in the heavy object pressure chamber 13, and then use heavy objects to bury the cable 2 in the heavy object pressure chamber 13. The heavy objects filled in the lower and upper parts of the cable 2 in the heavy object pressure chamber 13 include a mixture of stones 10 and soil 11; Clamp the cable 2 with damaged outer skin in the middle near both ends respectively in the semi-circular sealing rings 16 on both sides of the outer skin damage chamber 14, and use weather-resistant tape to stick the temperature sensor 3 on the outer surface of the cable 2 in the outer skin damage chamber 14; Connect two sections of cable 2 by means of end production to form an end-connected cable 2. Clamp the end-connected cable 2 near both ends in the semi-circular sealing rings 16 on both sides of the end-connection cavity 17. Use weather-resistant tape to stick the temperature sensor 3 on the outer surface of the end-connected cable 2; For one end of two sections of cable 2, install a wiring terminal, and for the other end, install another wiring terminal, and then use screws to connect to form a wiring-terminal cable 2. Clamp the wiring-terminal cable 2 near both ends in the semi-circular sealing rings 16 on both sides of the wiring-terminal cavity 18; use weather-resistant tape to stick the temperature sensor 3 on the outer surface of the wiring-terminal cable 2; Connect a thick cable 2 and two thin cables 2 by means of end production to form a Y-shaped tapering cable 2. Clamp the thick cable 2 at one end of the Y-shaped tapering cable 2 in the semi-circular sealing ring 16 on one side of the tapering cavity 19, and clamp the other two thin cables 2 in the two semi-circular sealing rings 16 on the other side of the tapering cavity 19 respectively; Clamp the cable 2 near both ends in the semi-circular sealing rings 16 on both sides of the humidity chamber 21. Use weather-resistant tape to stick the temperature sensor 3 on the outer surface of the cable 2 inside the humidity chamber 21. Install a humidity sensor 20 and a water mist generator 22 on one side wall of the humidity chamber 21 respectively. Connect the humidity sensor 20 and the humidity display 26 through a data cable. Fasten an experimental box cover 29 on the upper part of the humidity chamber 21 and ensure that the experimental box cover 29 and the experimental box 28 maintain a certain degree of sealing; Clamp the cable 2 near both ends in the semi-circular sealing rings 16 on both sides of the heat chamber 24. Use weather-resistant tape to stick the temperature sensor 3 on the outer surface of the cable 2 inside the heat chamber 24. Install a heat sensor 23 and a heater 25 on one side wall of the heat chamber 24 respectively. Connect the heat sensor 23 and the heat display 27 through a data cable. Fasten an experimental box cover 29 on the upper part of the heat chamber 24 and ensure that the experimental box cover 29 and the experimental box 28 maintain a certain degree of sealing; Then connect the data cables C6 of all the foregoing temperature sensors 3 to the corresponding digital temperature displays 7 respectively; connect one end of each cable 2 to a power supply, and connect the other end or both ends of each cable 2 to an electric energy release device; control the power connection of the cable 2 by the upper computer 1, the acquisition card of each digital temperature display 7 receives the real-time data of the corresponding temperature sensor 3 and transmits it to the upper computer 1 through the acquisition card, the start of operation of the humidity sensor 20 and the water mist generator 22, and the start of operation of the heat sensor 23 and the heater 25, and finally further analyze the collected data through the upper computer 1.

[0021] Further, on the outer edge surfaces near both ends of the outer side of the cable 2 experimental box 28, an incoming voltage collector 12 and an outgoing voltage collector 9 are respectively provided. The incoming I-shaped inductor 12 and the outgoing I-shaped inductor 9 are respectively connected to the inductor measuring instrument through the data line B5, and then the inductor measuring instrument transmits the waveform inductor value of the current collected by the cable 2 to the single-chip microcomputer detection board of the upper computer 1 for the upper computer 1 to analyze the loss of the current during use and make later comparisons.

[0022] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications within the protection scope of the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

[0023] The parts not detailed in the present invention are the prior art.

Claims

1. A test device for cable overheating, characterized in that: Inside the experimental box (28), there are respectively a heavy object pressure chamber (13), an epidermal damage chamber (14), an end connection chamber (17), a wiring terminal chamber (18), a tapping chamber (19), a humidity chamber (21), and a heat chamber (24). At both ends of the upper part of each chamber in the experimental box (28), there are respectively semi-circular sealing rings (16). Around the upper part of each chamber except for the semi-circular sealing rings (16), there are respectively sealing strips (15). On the upper parts of the humidity chamber (21) and the heat chamber (24), there are respectively experimental box covers (29) for closing; inside the humidity chamber (21), there are a humidity sensor (20) and a water mist generator (22), and inside the heat chamber (24), there are a heat sensor (23) and a heater (25); in the middle of each chamber, there is respectively a temperature sensor (3). The temperature sensor (3) is connected to a digital temperature display (7) with a matching number and an acquisition card through a data line C (6), and the digital temperature display (7) is connected to the upper computer (1) through a data line A (4).

2. The test device for cable overheating according to claim 1, wherein: Around the lower surface perimeter of the experimental box covers (29) of the humidity chamber (21) and the heat chamber (24), there are respectively sealing strips (15), and at both ends of the experimental box covers (29) of the humidity chamber (21) and the heat chamber (24), there are respectively semi-circular sealing rings (16).

3. The test device for cable overheating according to claim 1, characterized in that: The humidity sensor (20) in the humidity chamber (21) is connected to a humidity display (26) through a data line, and the humidity display (26) is connected to the upper computer (1) through a data line; the water mist generator (22) in the humidity chamber (21) is connected to a spraying device through a pipeline, and the water mist generator (22) is connected to the upper computer (1) through a data line.

4. The test device for cable overheating according to claim 1, characterized in that: The heat sensor (23) in the heat chamber (24) is connected to a heat display (27) through a data line, and the heat display (27) is connected to the upper computer (1) through a data line; the heat outlet of the heater (25) is connected to the heat chamber (24), and the heater (25) is connected to the upper computer (1) through a data line.

5. The test device for cable overheating according to claim 4, characterized in that: The heater (25) is a hot air blower or is externally connected to a hot air gas source through a heat-resistant pipeline.

6. The test device for cable overheating according to claim 1, wherein: The digital temperature display (7) is placed inside the box body (8).

7. The test device for cable overheating according to claim 1, characterized in that: On the four sides of the heavy object pressure chamber (13) of the experimental box (28), there are respectively heightening plates.

8. The test device for cable overheating according to any one of claims 1 to 7, characterized in that: Specific usage steps: Place the cable (2) into the heavy object pressure chamber (13), attach the temperature sensor (3) to the outer surface of the cable (2), and then bury the cable (2) in the heavy object pressure chamber (13) with heavy objects; place the cable (2) with damaged outer surface in the surface damage chamber (14), and attach the temperature sensor (3) to the cable (2); place the end-connected cable (2) in the end connection chamber (17), and attach the temperature sensor (3) to the end-connected cable (2); clamp the terminal cable (2) in the terminal chamber (18); attach the temperature sensor (3) to the terminal cable (2); place the Y-shaped tap cable (2) in the semi-circular sealing rings (16) on one side of the tap chamber (19) and the two semi-circular sealing rings (16) on the other side respectively; place the cable (2) in the humid chamber (21), attach the temperature sensor (3) to the cable (2), install the humidity sensor (20) and the water mist generator (22) in the humid chamber (21), and fasten the experimental box cover (29) on the upper part of the humid chamber (21); place the cable (2) in the heat chamber (24), attach the temperature sensor (3) to the cable (2), install the heat sensor (23) and the heater (25) on one side wall of the heat chamber (24) respectively, and fasten the experimental box cover (29) on the upper part of the heat chamber (24); then connect the data lines C (6) of all the aforementioned temperature sensors (3) to the corresponding digital temperature displays (7) respectively; connect one end of each cable (2) to the power supply respectively, and connect the other end or both ends of each cable (2) to the electric energy release device respectively; control the power-on of the cable (2) by the host computer (1), the acquisition card of each digital temperature display (7) receives the real-time data of the corresponding temperature sensor (3) and transmits it to the host computer (1) through the acquisition card, the start of operation of the humidity sensor (20) and the water mist generator (22), and the start of operation of the heat sensor (23) and the heater (25), and finally further analyze the collected data through the host computer (1).

9. The test device for cable overheating according to claim 8, characterized in that: The heavy objects filled in the lower and upper parts of the cable (2) in the heavy object pressure chamber (13) include a mixture of gravel (10) and soil (11).

10. The test device for cable overheating according to claim 8, characterized in that: On the outer edge surfaces near both ends of the cable (2) experimental box (28), an incoming voltage collector (12) and an outgoing voltage collector (9) are respectively provided. The incoming I-shaped inductor (12) and the outgoing I-shaped inductor (9) are respectively connected to the inductor measuring instrument through the data line B (5), and then the inductor measuring instrument transmits the collected inductor value to the host computer (1) for later comparison.

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