Cable smoke test testing device

Abstract

The application discloses a cable smoking test device. The device comprises a constant current source, a high-temperature box and a room-temperature box. The first positive terminal and the first negative terminal are arranged in the high-temperature box. The second positive terminal and the second negative terminal are arranged in the room-temperature box. The second positive terminal is connected with the first positive terminal. The second negative terminal is connected with the first negative terminal. The positive terminal and the negative terminal are used for connecting with the conductor of the cable to be tested. The positive copper plate is connected with the constant current source at one end and connected with the first positive terminal or the second positive terminal at the other end. The negative copper plate is connected with the constant current source at one end and connected with the first negative terminal or the second negative terminal at the other end. The device can test the current-carrying performance of the cable under the room-temperature condition and the high-temperature condition. The device has simple structure and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cable performance test, in particular, to a cable smoke test device. BACKGROUND

[0002] The cable smoke test refers to applying a certain current to the cable, observing whether the cable emits visible smoke under the action of the current, and recording the smoke emission time and the current, so as to judge the current carrying performance of the cable. The current cable smoke test device is mainly used for testing the current carrying performance of the cable under room temperature condition, and cannot be used for testing the current carrying performance of the cable under high temperature condition. In addition, the distance between the two terminal posts for connecting the cable conductor in the device is short, which cannot meet the test requirements. Moreover, the smoke generated in the test process is exposed to the air, which is harmful to the environment and the operator.

[0003] Therefore, the current cable smoke test device still needs to be improved. SUMMARY

[0004] The present application aims at at least one of the above problems, and provides a cable smoke test device which can test the current carrying performance of the cable under room temperature condition and high temperature condition, and has low cost and safe use.

[0005] The present application provides a cable smoke test device. The cable smoke test device comprises: a constant current source for applying a constant current to a cable to be tested; a high temperature box and a room temperature box, the high temperature box is provided with a first positive terminal post and a first negative terminal post, the room temperature box is provided with a second positive terminal post and a second negative terminal post, the second positive terminal post is connected with the first positive terminal post, and the second negative terminal post is connected with the first negative terminal post; a positive copper plate and a negative copper plate, one end of the positive copper plate is connected with the constant current source, and the other end of the positive copper plate is connected with the first positive terminal post or the second positive terminal post, one end of the negative copper plate is connected with the constant current source, and the other end of the negative copper plate is connected with the first negative terminal post or the second negative terminal post.

[0006] Further, the other end of the positive copper plate is connected with the first positive terminal post and extends into the room temperature box to be connected with the second positive terminal post, and the other end of the negative copper plate is connected with the first negative terminal post and extends into the room temperature box to be connected with the second negative terminal post.

[0007] Further, the positive copper plate and the negative copper plate respectively meet the following conditions: the length is 10-15 m, the width is 50-80 mm, and the thickness is 5-10 mm.

[0008] Further, the first positive terminal and the first negative terminal are arranged on the rear wall of the high-temperature box, the second positive terminal and the second negative terminal are arranged on the rear wall or the bottom of the room-temperature box, each of the terminals penetrates two oppositely arranged insulating blocks and is fixed in the insulating blocks, the two insulating blocks are fixed on the outer side and the inner side of the box respectively, and the part of the terminal on the outer side of the box is connected with the copper plate.

[0009] Further, the terminal comprises a main plate, a clamping plate and a fixing member, the main plate penetrates the insulating block and the box, the clamping plate is arranged on one side of the main plate, the conductor of the cable to be tested is arranged between the clamping plate and the main plate, and the fixing member penetrates the clamping plate and the main plate and fixes the conductor of the cable to be tested.

[0010] Further, the thickness of the main plate is 5-10 mm, the width of the main plate is 50-80 mm, the length of the insulating block in the direction of the thickness of the main plate is 10-12 times the thickness of the main plate, and the width of the insulating block in the direction perpendicular to the thickness of the main plate is 2-3 times the width of the main plate.

[0011] Further, the room-temperature box further comprises a third terminal, the third terminal is arranged side by side with the second positive terminal and the second negative terminal, the third terminal is not arranged between the second positive terminal and the second negative terminal, the third terminal is located at the first end of the room-temperature box, the first end of the room-temperature box is the end through which the positive copper plate and the negative copper plate pass first, the electrode polarity of the third terminal is opposite to that of the terminal close to the third terminal, and the part of the third terminal on the outer side of the room-temperature box is connected with the copper plate having the same electrode polarity.

[0012] Further, the constant current source is arranged side by side with the high-temperature box, and the room-temperature box is arranged opposite to the constant current source and the high-temperature box.

[0013] Further, the positive copper plate and the negative copper plate are oppositely arranged on the part from the high-temperature box to the room-temperature box, and an insulating support column is arranged between the positive copper plate and the negative copper plate.

[0014] Further, the top of the room-temperature box and the high-temperature box is provided with a smoke exhaust hood, the rear wall of the room-temperature box and the high-temperature box is black, the room-temperature box and the high-temperature box are provided with illuminating lamps, and the illuminating lamp in the high-temperature box is a high-temperature-resistant explosion-proof lamp.

[0015] The cable smoke test testing device has the following advantages:

[0016] Firstly, the device can test the current-carrying performance of the cable under room temperature condition and under high temperature condition;

[0017] Secondly, the room temperature box and the high temperature box are common devices in the field, and the whole device has simple structure and low cost, and the room temperature box and the high temperature box share one constant current source, which can further reduce the cost;

[0018] Thirdly, the arrangement of the whole device can optimize the occupied space, and is especially suitable for a laboratory with small length, and fully utilizes the space of the laboratory;

[0019] Fourthly, the third connecting post can be used to adjust the current applied by the constant current source, so as to ensure that the current output by the constant current source is the predetermined current, and reduce the influence of the non-predetermined current on the current-carrying performance of the cable in the current adjusting process, and the third connecting post can also be used to test the current-carrying performance of the cable with non-standard length, and test the fusing current of the fusible wire;

[0020] Fifthly, the device is safe to use, and reduces the harm to the environment and the operator. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 1 shows the schematic diagram of the electrical connection of each part of the cable smoke test device according to one embodiment of the present application;

[0022] Figure 2 Fig. 2 shows the structural schematic diagram of the cable smoke test device according to one embodiment of the present application;

[0023] Figure 3 Fig. 3 shows the partial structural schematic diagram of the positive copper plate and the negative copper plate according to one embodiment of the present application;

[0024] Figure 4 Fig. 4 shows the structural schematic diagram of the first positive connecting post according to one embodiment of the present application;

[0025] Figure 5 Fig. 5 shows the partial structural schematic diagram of the first insulating block and the main plate according to one embodiment of the present application;

[0026] Figure 6 Fig. 6 shows the structural schematic diagram of the cable smoke test device according to another embodiment of the present application.

[0027] Legend of reference signs:

[0028] 100: constant current source; 200: high temperature box; 210: first positive terminal; 211: main plate; 212: clamping plate; 213: fixing piece; 220: first negative terminal; 300: room temperature box; 310: second positive terminal; 320: second negative terminal; 330: third terminal; 400: positive copper plate; 500: negative copper plate; 1: first insulating block; 2: second insulating block; 3: third insulating block; 4: fourth insulating block; 5: fifth insulating block; 6: sixth insulating block; 7: seventh insulating block; 8: eighth insulating block; 9: ninth insulating block; 10: tenth insulating block; 20: insulating support column. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended only to explain the present application, and should not be construed as limiting the present application.

[0030] The present application provides a cable smoke test testing device. In some embodiments of the present application, referring to Figure 1 The cable smoke test testing device comprises a constant current source 100, a high temperature box 200, a room temperature box 300, a positive copper plate 400 and a negative copper plate 500. The constant current source 100 is used to apply a constant current to the cable to be tested. The high temperature box 200 is provided with a first positive terminal 210 and a first negative terminal 220. The room temperature box 300 is provided with a second positive terminal 310 and a second negative terminal 320. The second positive terminal 310 is connected to the first positive terminal 210, and the second negative terminal 320 is connected to the first negative terminal 220. The positive and negative terminals are used to be connected to the conductor of the cable to be tested. One end of the positive copper plate 400 is connected to the constant current source 100, and the other end is connected to the first positive terminal 210 or the second positive terminal 310. One end of the negative copper plate 500 is connected to the constant current source 100, and the other end is connected to the first negative terminal 220 or the second negative terminal 320.

[0031] In the present application, the distance between the first positive terminal 210 and the first negative terminal 220 is 1 m, and the distance between the second positive terminal 310 and the second negative terminal 320 is 2.5 m. Before the test, sampling is performed, and the length of the cable to be tested under room temperature conditions is greater than 2.5 m, and the length of the cable to be tested under high temperature conditions is greater than 1 m. The insulation at both ends of the cable to be tested is stripped to expose the conductors at both ends. When it is necessary to test the current-carrying performance of the cable under room temperature conditions, the conductor at one end of the cable to be tested is connected to the second positive terminal 310, the conductor at the other end is connected to the second negative terminal 320, and the cable between the second positive terminal 310 and the second negative terminal 320 is in a straightened state. The constant current source 100 is used to apply a current to the cable to be tested in the room temperature box 300. Whether there is visible smoke is observed through the observation window of the room temperature box, and the smoke time and the current are recorded. When it is necessary to test the current-carrying performance of the cable under high temperature conditions, the conductor at one end of the cable to be tested is connected to the first positive terminal 210, the conductor at the other end is connected to the first negative terminal 220, and the cable between the first positive terminal 210 and the first negative terminal 220 is in a straightened state. The temperature in the high temperature box 200 is raised to a predetermined temperature, and then the constant current source 100 is used to apply a current to the cable to be tested in the high temperature box 200. Whether there is visible smoke is observed through the observation window of the high temperature box, and the smoke time and the current are recorded.

[0032] The current cable smoke test device is directly derived from the constant current source device, with two terminals having a short distance (the distance between the two terminals is less than 1 m), which does not meet the test requirements. The entire test process is exposed to the air, and the device can only be used for testing the current-carrying performance of the cable under room temperature conditions. If high temperature testing is required, a special high temperature testing device needs to be provided, which has a high cost. In the present application, the constant current source is a separate device, the high temperature box and the room temperature box are common devices in the field, and the terminals are connected by copper plates (i.e. the first positive terminal is connected to the second positive terminal, and the first negative terminal is connected to the second negative terminal). The terminals are connected to the constant current source through copper plates to form a complete device. This device not only can test the current-carrying performance of the cable under room temperature conditions, but also can test the current-carrying performance of the cable under high temperature conditions. It has high practicability, simple structure, high safety, low cost, and can share one constant current source for the room temperature box and the high temperature box, which can further reduce the cost. In addition, the entire test process is carried out in the box, which can reduce air pollution and harm to operators.

[0033] As understood by those skilled in the art, the terminals are insulated from the box, and the copper plates are also insulated from the box to ensure safety during the test.

[0034] In the present application, the outer side of the positive copper plate 400 and the negative copper plate 500 is wrapped with an insulating layer to ensure the safety of the test process. The material of the insulating layer wrapped on the outer side of the copper plate is not particularly limited, and those skilled in the art can select according to the actual situation.

[0035] In the present application, the second positive terminal 310 is connected with the first positive terminal 210, the second negative terminal 320 is connected with the first negative terminal 220, the other end of the positive copper plate 400 can be connected with the first positive terminal 210 or the second positive terminal 310, and the other end of the negative copper plate 500 can be connected with the first negative terminal 220 or the second negative terminal 320. Thus, the high-temperature box and the room-temperature box can be connected with the constant current source, so that the constant current source applies current to the cable to be tested in the high-temperature box or the room-temperature box.

[0036] In the preferred embodiment of the present application, referring to Figure 1 and Figure 2 , the other end of the positive copper plate 400 is connected with the first positive terminal 210 and extends to the room-temperature box 300 to be connected with the second positive terminal 310, and the other end of the negative copper plate 500 is connected with the first negative terminal 220 and extends to the room-temperature box 300 to be connected with the second negative terminal 320. That is, the positive copper plate and the negative copper plate from the constant current source are first connected with the terminals in the high-temperature box and then connected with the terminals in the room-temperature box. Compared with the structure that the terminals in the room-temperature box are connected first and then the terminals in the high-temperature box, the structure of the present embodiment can reduce the length of the positive copper plate or the negative copper plate to reduce the loss of current in the copper plate and improve the consistency of the current applied to the cable to be tested and the current provided by the constant current source.

[0037] In some embodiments of the present application, referring to Figure 3The positive electrode copper plate 400 and the negative electrode copper plate 500 respectively meet the following conditions: length of 10-15m, width D of 50-80mm, and thickness d1 of 5-10mm. Specifically, the length can be 10m, 11m, 12m, 13m, 14m, or 15m; the width D can be 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, or 80mm; and the thickness d1 can be 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm. Preferably, the width of the positive electrode copper plate is the same as the width of the negative electrode copper plate, and the thickness of the positive electrode copper plate is the same as the thickness of the negative electrode copper plate. Under the above conditions, it can be ensured that the positive and negative copper plates can carry a sufficiently large current (the current carrying capacity can be greater than 1000A), and the current loss in the positive and negative copper plates can be reduced, improving the consistency between the current applied to the cable under test and the current provided by the constant current source, improving the accuracy of the test results, and the copper plates with the above dimensions are easy to fix and have high stability.

[0038] In some embodiments of the present invention, reference is made to Figure 2 The first positive terminal 210 and the first negative terminal 220 are located on the rear wall of the high-temperature chamber 200, and the second positive terminal 310 and the second negative terminal 320 are located on the rear wall of the room temperature chamber 300 (not shown in the figure) or on the bottom (e.g.) Figure 2 As shown in the diagram, each terminal passes through two opposing insulating blocks and is fixed within these blocks. The two insulating blocks are fixed to the outside and inside of the enclosure, respectively. Therefore, when a terminal passes through two opposing insulating blocks, it must pass through the enclosure between the two blocks. The portion of the terminal on the outside of the enclosure is connected to the copper plate to achieve the connection between the copper plate and the terminal. It should be noted that "enclosure" here refers to the rear wall of the high-temperature enclosure, or the rear wall or bottom of the room-temperature enclosure. The portion of the positive terminal on the outside of the enclosure is connected to the positive copper plate, and the portion of the negative terminal on the outside of the enclosure is connected to the negative copper plate.

[0039] In some specific embodiments of the present invention, reference is made to... Figure 2The outer side of the rear wall of the high-temperature box 200 is fixed with a first insulating block 1 and a second insulating block 2, and the inner side of the rear wall of the high-temperature box 200 is fixed with a third insulating block 3 and a fourth insulating block 4, wherein the third insulating block 3 and the first insulating block 1 are oppositely arranged, the fourth insulating block 4 and the second insulating block 2 are oppositely arranged, the first positive electrode connecting column 210 penetrates the first insulating block 1, the rear wall of the high-temperature box 200, the third insulating block 3 in sequence and extends to the inside of the high-temperature box 200, the first positive electrode connecting column 210 is fixed in the first insulating block 1 and the third insulating block 3, and the part of the first positive electrode connecting column 210 located outside the high-temperature box 200 is connected with the positive electrode copper plate 400, the first negative electrode connecting column 220 penetrates the second insulating block 2, the rear wall of the high-temperature box 200, the fourth insulating block 4 in sequence and extends to the inside of the high-temperature box 200, the first negative electrode connecting column 220 is fixed in the second insulating block 2 and the fourth insulating block 4, and the part of the first negative electrode connecting column 220 located outside the high-temperature box 200 is connected with the negative electrode copper plate 500. By arranging the insulating blocks, the connecting columns can be insulated from the box body of the high-temperature box, and the connecting columns can be fixed. The specific way in which the insulating blocks are fixed on the rear wall of the high-temperature box and the specific way in which the connecting columns are fixed in the insulating blocks are not particularly limited, and a person skilled in the art can design them according to the actual situation. It should be noted that Figure 2 The third insulating block, the fourth insulating block, the first positive electrode connecting column and the first negative electrode connecting column in the high-temperature box are in perspective effect, so as to clearly show the positional relationship between the insulating blocks and the connecting columns.

[0040] In some specific embodiments of the present application, referring to Figure 2 The outer side of the bottom of the room-temperature box 300 is fixed with a fifth insulating block 5 and a sixth insulating block 6, and the inner side of the bottom of the room-temperature box 300 is fixed with a seventh insulating block 7 and an eighth insulating block 8, wherein the first insulating block 7 and the fifth insulating block 5 are oppositely arranged, the eighth insulating block 8 and the sixth insulating block 6 are oppositely arranged, the second positive electrode connecting column 310 penetrates the fifth insulating block 5, the bottom of the room-temperature box 300, the seventh insulating block 7 in sequence and extends to the inside of the room-temperature box 300, the second positive electrode connecting column 310 is fixed in the fifth insulating block 5 and the seventh insulating block 7, and the part of the second positive electrode connecting column 310 located outside the room-temperature box 300 is connected with the positive electrode copper plate 400, the second negative electrode connecting column 320 penetrates the sixth insulating block 6, the bottom of the room-temperature box 300, the eighth insulating block 8 in sequence and extends to the inside of the room-temperature box 300, the second negative electrode connecting column 320 is fixed in the sixth insulating block 6 and the eighth insulating block 8, and the part of the second negative electrode connecting column 320 located outside the room-temperature box 300 is connected with the negative electrode copper plate 500. By arranging the insulating blocks, the connecting columns can be insulated from the box body of the room-temperature box, and the connecting columns can be fixed. The specific way in which the insulating blocks are fixed on the bottom of the room-temperature box and the specific way in which the connecting columns are fixed in the insulating blocks are not particularly limited, and a person skilled in the art can design them according to the actual situation. It should be noted that Figure 2The fifth insulating block, the sixth insulating block, the seventh insulating block, the eighth insulating block, the second positive pole terminal and the second negative pole terminal in the figure are in perspective effect, so as to clearly show the positional relationship between the insulating blocks and the terminals.

[0041] In some embodiments of the present application, each terminal comprises a main plate, a clamping plate and a fixing member, wherein the main plate penetrates through the insulating block and the box, the clamping plate is located on one side of the main plate, the conductor of the cable to be tested is placed between the clamping plate and the main plate, and the fixing member penetrates through the clamping plate and the main plate and fixes the conductor of the cable to be tested. Specifically, referring to Figure 4 , the first positive pole terminal 210 comprises a main plate 211, a clamping plate 212 and a fixing member 213, the main plate 211 penetrates through the first insulating block 1, the rear wall of the high-temperature box (not shown in the figure) and the third insulating block 3, the clamping plate 212 is located on one side of the main plate 211, the fixing member 213 can be a screw and a nut, the screw penetrates through the clamping plate 212 and the main plate 211 and is provided with a nut at the tail end, the conductor of the cable to be tested is placed between the clamping plate 212 and the main plate 211, and the clamping plate 212 and the main plate 211 are tightly fixed by screwing the nut to fix the cable to be tested. It should be noted that the specific structure of the part of the main plate located outside the box is not particularly limited, as long as it can be connected with the corresponding copper plate. For example, referring to Figure 4 , the part of the main plate 211 located outside the high-temperature box (not shown in the figure) can be curved to be connected with the positive pole copper plate 400.

[0042] In some embodiments of the present application, referring to Figure 5 , the thickness d2 of the main plate 211 can be 5-10 mm, such as 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, and the width D1 can be 50-80 mm, such as 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm or 80 mm. In the direction of the thickness of the main plate 211, the length L of the insulating block (such as the first insulating block 1 shown in Figure 5 ) can be 10-12 times the thickness d2 of the main plate 211. In the direction perpendicular to the thickness of the main plate 211, the width D2 of the insulating block (such as the first insulating block 1 shown in Figure 5 ) can be 2-3 times the width D1 of the main plate 211. In the test process, the insulating block meeting the above conditions can prevent the flashover current generated in the copper plate from contacting the box, thereby improving the safety of the test.

[0043] The width and thickness of the clamping plate can be consistent with those of the main plate, which will not be described here again.

[0044] The material constituting the insulating block is not particularly limited, as long as it can fix the terminal and is insulating. Those skilled in the art can design it according to the specific circumstances.

[0045] In some embodiments of the present application, referring toFigure 6 The room temperature chamber 300 further includes a third terminal 330. The third terminal 330 is arranged side by side with the second positive terminal 310 and the second negative terminal 320. If the third terminal 330 is not located between the second positive terminal 310 and the second negative terminal 320, then the third terminal 330 is located on the side of the second positive terminal 310 away from the second negative terminal 320, or the third terminal 330 is located on the side of the second negative terminal 320 away from the second positive terminal 310. The third terminal 330 is located at the first end of the room temperature chamber 300. The positive copper plate 400 and the negative copper plate 500 pass through one end of the room temperature chamber 300 first. The electrode polarity of the third terminal 330 is opposite to that of the terminal closest to it (i.e., the second positive terminal 310 or the second negative terminal 320). The part of the third terminal 330 located outside the room temperature chamber 300 is connected to a copper plate with the same electrode polarity.

[0046] The third terminal 330 is configured in the same way as the second positive terminal 310 and the second negative terminal 320. For details, please refer to [reference needed]. Figure 6 A ninth insulating block 9 is fixed to the outer side of the bottom of the room temperature chamber 300, and a tenth insulating block 10 is fixed to the inner side of the bottom of the room temperature chamber 300. The tenth insulating block 10 and the ninth insulating block 9 are arranged opposite each other. The third terminal 330 passes through the ninth insulating block 9, the bottom of the room temperature chamber 300, and the tenth insulating block 10 in sequence and extends into the interior of the room temperature chamber 300. The third terminal 330 is fixed in the ninth insulating block 9 and the tenth insulating block 10. The third terminal 330 is located at the first end of the room temperature chamber 300. The third terminal 330 is located close to the second negative terminal 320, so the third terminal 330 is the positive terminal. The part of the third terminal 330 located on the outer side of the room temperature chamber 300 is connected to the positive copper plate 400.

[0047] Before the test, take a non-test sample, strip the insulation from both ends of the non-test sample to expose the conductor, connect one end of the conductor of the non-test sample to the third terminal 330, and connect the other end of the conductor to the second negative terminal 320 (to...). Figure 6 Taking this as an example, with the non-test sample in a straightened state, the constant current source 100 is then turned on. The current is adjusted to the predetermined current by rotating the current adjustment button. The constant current source 100 is then turned off, the non-test sample is removed, and the cable under test is placed in the high-temperature chamber 200 or the room-temperature chamber 300 (select the chamber according to the specific test conditions). The constant current source 100 is then turned on again, and the current output by the constant current source 100 will be the predetermined current. That is, the output current of the constant current source can be pre-adjusted using the third terminal to ensure that the output current is the predetermined current, reducing the impact of non-predetermined current on the current-carrying capacity of the cable under test during current adjustment.

[0048] In some embodiments of the present application, the distance between the third terminal 330 and the second negative terminal 320 (for example) can be 200 mm, and the third terminal and the second negative terminal can be used to test the current-carrying performance of a non-standard length cable under room temperature conditions. In addition, a fusible wire can be arranged between the third terminal 330 and the second negative terminal 320, and a current can be applied by a constant current source to test the fusing current of the fusible wire. Figure 6

[0049] The structure and size of the third terminal are consistent with those of the second positive terminal, and the sizes of the ninth and tenth insulating blocks are consistent with that of the first insulating block, which will not be described here again.

[0050] In some embodiments of the present application, referring to Figure 2 and Figure 6 , the constant current source 100 is arranged side by side with the high-temperature box 200, and the room temperature box 300 is arranged opposite to the constant current source 100 and the high-temperature box 200. The positive copper plate and the negative copper plate are first extended in the direction in which the constant current source and the high-temperature box are arranged side by side, then bent to the direction of the room temperature box, and then bent again and extended in the direction of the room temperature box, generally forming a U-shaped type. Compared with the scheme in which the constant current source, the high-temperature box, and the room temperature box are arranged side by side, the arrangement of the entire device in this embodiment can optimize the occupied space, and is especially suitable for a laboratory with a small length, which fully utilizes the space of the laboratory.

[0051] In some embodiments of the present application, referring to Figure 2 and Figure 6 , the positive copper plate 400 and the negative copper plate 500 are arranged opposite to each other in the up-down direction from the high-temperature box 200 to the room temperature box 300, and an insulating support column 20 is arranged between the positive copper plate 400 and the negative copper plate 500. Since the lengths of the positive copper plate and the negative copper plate are relatively long, the insulating support column can keep a stable interval between the positive copper plate and the negative copper plate, and can also support the copper plate above to a certain extent. Further, an insulating support column (not shown in the figure) can also be arranged between the copper plate below and the ground to support the two copper plates above and below.

[0052] In some embodiments of the present application, the top of the high-temperature box 200 and the top of the room temperature box 300 each have a smoke exhaust hood (not shown in the figure). In this way, the smoke generated during the test can be collected and treated, further reducing the harm to the environment and the operating personnel.

[0053] In some embodiments of the present application, the rear walls of the high-temperature box 200 and the room temperature box 300 can each be black, so that the operating personnel can observe the smoke phenomenon.

[0054] ​In some embodiments of the present application, lighting lamps can also be arranged in the high-temperature box 200 and the room-temperature box 300, and the lighting lamps arranged in the high-temperature box 200 need to be high-temperature resistant and explosion-proof, so that the operator can observe the smoke phenomenon.

[0055] In addition, the device of the present application can also be used for the temperature rise test of the cable. Specifically, the insulation of the two ends of the cable to be tested is stripped to expose the conductors at the two ends, and a plurality of insulations in the remaining insulation are stripped to expose the conductors at a predetermined distance (which can be determined according to the test requirements). The conductor at one end of the cable to be tested is connected to the positive terminal post, the conductor at the other end is connected to the negative terminal post, and the cable to be tested is in a straightened state. The first thermocouple of the multi-channel temperature tester is connected to the conductor at one end of the cable to be tested (between the positive terminal post and the negative terminal post), the second thermocouple of the multi-channel temperature tester is connected to the conductor at the other end of the cable to be tested (between the positive terminal post and the negative terminal post), and the plurality of thermocouples of the multi-channel temperature tester are respectively connected to the plurality of conductors in the cable to be tested. Subsequently, the constant current source is turned on to apply current to the cable to be tested, the temperatures measured by the plurality of thermocouples of the multi-channel temperature tester are observed, and the relationship curve between the applied current and the conductor temperature is obtained, so as to evaluate the current-carrying performance of the cable to be tested.

[0056] In the description of the present application, the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and do not require the present application to be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0057] In the description of the present application, the description of the terms "one embodiment", "another embodiment", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment are included in at least one embodiment of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Furthermore, the skilled person in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction. In addition, it should be noted that in the present specification, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0058] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as a limitation on the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A cable smoke emission test apparatus, characterized by, The utility model relates to a cable testing device, including: a constant current source for applying a constant current to a cable to be tested; a high-temperature chamber having a first positive terminal and a first negative terminal disposed therein, and a room-temperature chamber having a second positive terminal and a second negative terminal disposed therein, the second positive terminal being connected to the first positive terminal and the second negative terminal being connected to the first negative terminal, the positive and negative terminals being configured to be connected to conductors of the cable to be tested; a positive copper plate having one end connected to the constant current source and the other end connected to the first positive terminal and extending into the room-temperature chamber to be connected to the second positive terminal, and a negative copper plate having one end connected to the constant current source and the other end connected to the first negative terminal and extending into the room-temperature chamber to be connected to the second negative terminal, the room-temperature chamber further comprising a third terminal disposed side by side with the second positive terminal and the second negative terminal and not disposed between the second positive terminal and the second negative terminal, the third terminal being located at a first end of the room-temperature chamber, the first end of the room-temperature chamber being the end through which the positive copper plate and the negative copper plate first pass, the electrode polarity of the third terminal being opposite to that of the terminal adjacent thereto, and the portion of the third terminal located outside the room-temperature chamber being connected to the copper plate having the same electrode polarity.

2. The cable smoke emission test apparatus of claim 1, wherein, The positive copper plate and the negative copper plate each satisfy the following conditions: length of 10-15 m, width of 50-80 mm, and thickness of 5-10 mm.

3. The cable smoke emission test apparatus of claim 1, wherein, The first positive terminal and the first negative terminal are disposed on a rear wall of the high-temperature chamber, and the second positive terminal and the second negative terminal are disposed on a rear wall or a bottom of the room-temperature chamber, each of the terminals penetrating through two insulating blocks disposed opposite to each other and being fixed in the insulating blocks, the two insulating blocks being fixed to the outside and the inside of the chamber body respectively, and the portion of the terminal located outside the chamber body being connected to the copper plate.

4. The cable smoke emission test apparatus of claim 3, wherein, The terminal comprises a main plate, a clamping plate, and a fixing member, the main plate penetrating through the insulating blocks and the chamber body, the clamping plate being located on one side of the main plate, the conductor of the cable to be tested being placed between the clamping plate and the main plate, and the fixing member penetrating through the clamping plate and the main plate and fixing the conductor of the cable to be tested.

5. The cable smoke emission test apparatus of claim 4, wherein, The thickness of the main plate is 5-10 mm, the width of the main plate is 50-80 mm, the length of the insulating block in the direction of the thickness of the main plate is 10-12 times the thickness of the main plate, and the width of the insulating block in the direction perpendicular to the thickness of the main plate is 2-3 times the width of the main plate.

6. The cable smoke emission test apparatus of claim 1, wherein, The constant current source is disposed side by side with the high-temperature chamber, and the room-temperature chamber is disposed opposite to the constant current source and the high-temperature chamber.

7. The cable smoke emission test apparatus of claim 1 wherein, The portion of the positive copper plate and the negative copper plate extending from the high-temperature chamber to the room-temperature chamber is disposed opposite to each other, and an insulating support column is disposed between the positive copper plate and the negative copper plate.

8. The cable smoke emission test apparatus of claim 1 wherein, The top of the room temperature box and the high temperature box is provided with a smoke exhaust hood, the back wall of the room temperature box and the high temperature box is black, lighting lamps are arranged in the room temperature box and the high temperature box, and the lighting lamp in the high temperature box is a high-temperature-resistant explosion-proof lamp.

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