A cable current-carrying capacity test device and method capable of simulating high temperature environment

Abstract

The application discloses a cable ampacity test device and method capable of simulating high-temperature environment in the technical field of cable ampacity test, which comprises a bend pipe section, two straight pipe sections, two heat preservation end covers, and an upper heat preservation pipe and a lower heat preservation pipe and an insulation support. The two straight pipe sections are in sealed connection with the bend pipe section at one end, the two heat preservation end covers are in sealed connection with the other end of the straight pipe section and are provided with inlets and outlets matched with test cables, the bend pipe section and the straight pipe section each comprise the upper heat preservation pipe, the lower heat preservation pipe and the insulation support, the two sides of the upper heat preservation pipe are in sealed connection with the two sides of the lower heat preservation pipe and form a test cavity for accommodating the test cables, and the plurality of insulation supports are distributed along the axial direction of the test cavity and are used for radially supporting the test cables. The test cavity is formed by the connection of the plurality of upper heat preservation pipes and lower heat preservation pipes, the test cavity is heated to a test temperature by the self-heating of the test cables, the ampacity test of the test cables in the high-temperature environment is realized, and the application has the advantages of simple structure, convenient operation and green energy saving.

Description

Technical Field

[0001] This invention relates to the field of cable current carrying capacity testing technology, and specifically to a cable current carrying capacity testing device and method. Background Technology

[0002] A current-carrying capacity test involves applying a stable, adjustable direct current to a conductor, maintaining the current constant, and measuring the temperature of the conductor surface during the test period to determine the conductor's current-carrying capacity.

[0003] Existing current carrying capacity tests are all conducted at ambient temperature (e.g., room temperature of 23°C), and current current carrying capacity standards only include current carrying capacity tests at room temperature. Current carrying capacity data under specific conditions can only be estimated using formulas. However, for large-section cables, especially complex cables such as DC cables, there is a difference between the current carrying capacity data calculated by formulas and the actual current carrying capacity data.

[0004] For large-section cables, it is very difficult to conduct current-carrying capacity tests in a specified high-temperature environment (such as 40°C). This is because large-section cables have complex internal structures, resulting in large weight and volume of the cables themselves, requiring a large test area. However, it is very difficult to raise the temperature of the entire test area containing the cable to the specified test temperature. At the same time, maintaining a constant temperature in the test area is also impractical.

[0005] Therefore, how to conduct current-carrying capacity tests on cables in high-temperature environments has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a cable current carrying capacity testing device that can simulate a high-temperature environment, so as to solve the technical problem that existing current carrying capacity tests cannot accurately obtain the cable current carrying capacity in a high-temperature environment.

[0007] The technical solution adopted in this invention is: a cable current-carrying capacity testing device capable of simulating a high-temperature environment, comprising:

[0008] bend in the pipe;

[0009] The straight pipe section consists of two sections, and one end of each straight pipe section is sealed to the bend section.

[0010] The insulation end caps are of two types and are sealed to the other end of the straight pipe section. The insulation end caps are provided with inlets and outlets that cooperate with the test cable.

[0011] The curved section and the straight section each include an upper insulation pipe, a lower insulation pipe, and an insulating support. The two sides of the upper insulation pipe are sealed to the two sides of the lower insulation pipe to form a test cavity for accommodating the test cable. Multiple insulating supports are distributed along the axial direction of the test cavity and connected to the lower insulation pipe to provide radial support for the test cable.

[0012] Preferably, the axial length of the straight pipe section is adjustable.

[0013] Preferably, the straight pipe section includes multiple extension pipes arranged in sequence and sealed together, and one end of each extension pipe is provided with a male connector and the other end is provided with a female connector that can be sealed and inserted into the male connector.

[0014] Preferably, the radial dimensions of the inlet and outlet are adjustable.

[0015] Preferably, the heat-insulating end cap includes an elastic heat-insulating part and a rigid connecting part. The rigid connecting part is detachably and fixedly connected to the end of the straight pipe section. The elastic heat-insulating part is disposed between the rigid connecting part and the straight pipe section and is provided with the inlet and outlet.

[0016] Preferably, the bottom end of the insulating bracket is detachably and fixedly connected to the lower insulation pipe, and the spacing between two adjacent insulating brackets can be adjusted.

[0017] Preferably, the insulating support includes a radial connecting rod and a support plate, the bottom end of the radial connecting rod is inserted and fixed in the insertion groove of the lower insulation pipe, and the top end is fixedly connected to the support plate.

[0018] Preferably, the length of the radial connecting rod is adjustable.

[0019] Preferably, the support plate is an arc-shaped plate coaxial with the lower insulation pipe.

[0020] Preferably, the support plate is provided with rollers for testing the axial movement of the cable.

[0021] Preferably, the upper insulation pipe includes an upper rigid insulation outer layer and an upper flexible insulation inner layer, and the lower insulation pipe includes a lower rigid insulation outer layer and a lower flexible insulation inner layer; the two sides of the upper rigid insulation outer layer can be snapped onto the two sides of the lower rigid insulation outer layer, the two sides of the upper flexible insulation inner layer abut against the two sides of the lower flexible insulation inner layer, and the connecting seam between the upper rigid insulation outer layer and the lower rigid insulation outer layer is staggered with the connecting seam between the upper flexible insulation inner layer and the lower flexible insulation inner layer.

[0022] Another object of the present invention is to provide a cable current-carrying capacity test method capable of simulating a high-temperature environment, the method comprising the following steps:

[0023] S10: Place the test cable in a sealed, insulated tubular test chamber, with both ends of the test cable extending out of the test chamber;

[0024] S20: Apply a heating current to the test cable until the temperature of the test chamber reaches the test temperature;

[0025] S30: Apply a test current to the test cable and obtain the current carrying capacity data of the test cable;

[0026] The test current is less than the heating current.

[0027] The beneficial effects of this invention are:

[0028] This invention employs a detachable connection structure. First, multiple arc-shaped upper and lower insulation pipes are sealed and connected to form a bent pipe section and two straight pipe sections, with the straight pipe sections sealed and connected to both ends of the bent pipe section. Then, insulation end caps are connected to the ends of the straight pipe sections, thereby forming a sealed, insulated tubular test chamber, reducing the test space required. Finally, the test cable is radially supported by an insulating bracket within the test chamber, allowing the test cable to be quickly and coaxially fixed within the test chamber. By passing a heating current through the test cable, the test chamber can be rapidly heated to the test temperature, simulating cable current-carrying capacity tests in high-temperature environments. Attached Figure Description

[0029] Figure 1 This is a top view of the cable current carrying capacity testing device of the present invention, which can simulate a high-temperature environment;

[0030] Figure 2 for Figure 1 AA view in the middle;

[0031] Figure 3 This is a schematic diagram of the extension pipe structure;

[0032] Figure 4 This is a schematic diagram showing the connection between the insulated end cap and the straight pipe section;

[0033] Figure 5 This is a schematic diagram of the radial connecting rod.

[0034] Explanation of the reference numerals in the figure:

[0035] 100. Bend section;

[0036] 200. Straight pipe section;

[0037] 210. Extension pipe;

[0038] 211. Male connector; 212. Female connector;

[0039] 300. Insulated end cap;

[0040] 310. Elastic heat insulation part; 311. Inlet / outlet; 320. Rigid connection part; 330. Fastening bolt;

[0041] 400. Install insulation pipe;

[0042] 410. Rigid outer insulation layer; 420. Flexible inner insulation layer;

[0043] 500, lower insulation pipe;

[0044] 510. Lower rigid insulation outer layer; 520. Lower flexible insulation inner layer;

[0045] 600. Insulating support;

[0046] 610. Radial connecting rod; 620. Support plate; 630. Roller;

[0047] 611. Upper connecting rod; 612. Adjusting sleeve; 613. Lower connecting rod;

[0048] 700. Test chamber;

[0049] 800, Balance Frame;

[0050] 900. Test cable. Detailed Implementation

[0051] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0052] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0055] Examples, such as Figures 1-5 As shown, a cable current-carrying capacity testing device capable of simulating a high-temperature environment is used to test the current-carrying capacity data of large-section cables in a high-temperature environment; the testing device includes:

[0056] 100 bends in the pipe.

[0057] There are two straight pipe sections 200, and one end of each straight pipe section 200 is sealed to one end of each bend section 100.

[0058] There are two heat-insulating end caps 300, and the two heat-insulating end caps 300 are sealed to the other end of the straight pipe section 200. At the same time, the heat-insulating end caps 300 are provided with inlet and outlet 311 that cooperate with the test cable 900. That is, both ends of the test cable 900 pass through the inlet and outlet 311 and are sealed to the heat-insulating end caps 300.

[0059] The curved section 100 and the straight section 200 each include an upper insulation pipe 400, a lower insulation pipe 500, and an insulating support 600. The two sides of the upper insulation pipe 400 are sealed to the two sides of the lower insulation pipe 500, forming a test cavity 700 for accommodating the test cable 900. Multiple insulating supports 600 are distributed along the axial direction of the test cavity 700 and connected to the lower insulation pipe 500 to provide radial support for the test cable 900.

[0060] This application adopts a detachable connection structure. First, multiple upper insulation pipes 400 and lower insulation pipes 500 are sealed and connected to form a bent pipe section 100 and two straight pipe sections 200. The straight pipe sections 200 are sealed and connected to both ends of the bent pipe section 100. Then, insulation end caps 300 are sealed and connected to the ends of the straight pipe sections 200, thereby forming a sealed and insulated tubular test chamber 700. This reduces the test space and facilitates the control of the test environment temperature. Finally, the test cable 900 is radially supported by the insulating bracket 600 in the test chamber 700, which can quickly fix the test cable 900 in the test chamber 700. By passing a heating current through the test cable 900, the test chamber 700 can be rapidly heated to the test temperature to simulate the cable current carrying capacity test in a high-temperature environment.

[0061] In one specific embodiment, such as Figure 1 , Figure 3 As shown, the axial length of the straight pipe section 200 is adjustable.

[0062] This configuration is based on the fact that the test length of the test cable 900 varies when performing current-carrying capacity tests on different test cables 900. In this embodiment, the axial length of the straight pipe section 200 is set to be adjustable. By adjusting the axial length of the straight pipe section 200, the testing device can be used to perform current-carrying capacity tests on test cables 900 of different lengths, thus expanding the applicability of the testing device.

[0063] Preferred, such as Figure 3 As shown, each straight pipe section 200 includes multiple extension pipes 210, and the multiple extension pipes 210 are arranged sequentially along the axial direction and sealed together, that is, adjacent extension pipes 210 are coaxially sealed together.

[0064] Specifically, each extension tube 210 has a male connector 211 at one end and a female connector 212 at the other end, and the male connector 211 can be sealed and plugged into the female connector 212.

[0065] This configuration is because: a male connector 211 is provided at one end of each extension pipe 210, and a female connector 212 is provided at the other end. By sealing and inserting the male connector 211 of one extension pipe 210 with the female connector 212 of another extension pipe 210, the two adjacent extension pipes 210 can be quickly connected, thereby enabling the adjustment of the axial length of the straight pipe section 200.

[0066] In one specific embodiment, such as Figure 4 As shown, the radial dimension of the inlet / outlet 311 is adjustable.

[0067] This design is based on the principle of spatial segmentation, which fixes the test cable 900 within the sealed and insulated test chamber 700. To reduce heat loss from the test chamber 700, the test cable 900, which passes through the inlet / outlet 311, needs to be sealed to the insulated end cap 300. In this embodiment, the radial dimension of the inlet / outlet 311 is adjustable, which not only improves the sealing performance of the connection between the test cable 900 and the insulated end cap 300, but also allows for current testing of test cables 900 with different radial dimensions, thereby expanding the applicability of the testing device.

[0068] Preferred, such as Figure 4As shown, the heat-insulating end cap 300 includes an elastic heat-insulating part 310, a rigid connecting part 320, and a fastening bolt 330. The elastic heat-insulating part 310 is a circular elastic heat-insulating sheet, and a coaxial inlet and outlet 311 is provided in the middle of the elastic heat-insulating sheet. The radial dimension of the inlet and outlet 311 is smaller than the radial dimension of the test cable 900. The rigid connecting part 320 is an annular pressure cap, and multiple through holes (not shown) are evenly distributed around the circumference of the annular pressure cap. At the same time, multiple threaded connection holes are provided at the end of the straight pipe section 200. The threaded connection holes correspond one-to-one with the through holes. The elastic heat-insulating sheet is located between the annular pressure cap and the end of the straight pipe section 200, and the fastening bolt 330 passes through the through holes and is threaded into the threaded connection holes, so that the annular pressure cap and the end of the straight pipe section 200 clamp and fix the elastic heat-insulating sheet, thereby achieving a sealed connection between the elastic heat-insulating sheet and the straight pipe section 200, and thus maintaining the stability of the internal temperature of the test chamber 700.

[0069] This arrangement is because: placing the elastic heat insulation part 310 between the rigid connection part 320 and the end of the straight pipe section 200, and detachably fixing the rigid connection part 320 and the end of the straight pipe section 200 with fastening bolts 330, not only can the elastic heat insulation part 310 be sealed to the end of the straight pipe section 200, but it also facilitates the disassembly and installation of the heat insulation end cap 300, thereby facilitating the replacement of different test cables 900 for current carrying capacity testing.

[0070] In other embodiments, the elastic heat insulation part 310 may be fixedly connected to the rigid connection part 320, and the rigid connection part 320 may be threadedly connected to the end of the straight pipe section 200.

[0071] In one specific embodiment, such as Figure 2 As shown, the bottom end of the insulating bracket 600 is detachably and fixedly connected to the lower insulation pipe 500, and the spacing between two adjacent insulating brackets 600 can be adjusted in the axial direction of the bent pipe section 100 and the straight pipe section 200.

[0072] This design is because a larger contact area between the insulating support 600 and the test cable 900 results in a greater impact on the heat dissipation of the test cable 900. In this embodiment, the insulating support 600 and the lower insulation pipe 500 are detachably connected, allowing the distance between adjacent insulating supports 600 to be adjusted. This means the number of insulating supports 600 installed in the bend section 100 and the straight section 200 can be increased or decreased according to actual conditions. In other words, the number of insulating supports 600 can be adjusted according to the weight of the test cable 900 to support test cables 900 of different lengths or weights and reduce the impact on the heat dissipation of the test cable 900.

[0073] Preferably, multiple insertion slots (not shown) are linearly distributed along the axial direction at the bottom of the lower insulation pipe 500; the insulation bracket 600 includes a radial connecting rod 610 and a support plate 620, and the bottom end of the radial connecting rod 610 is inserted and fixed in the insertion slot, and the top end is fixedly connected to the support plate 620.

[0074] Specifically, a plug slot or threaded hole is provided at the bottom of the lower insulation pipe 500 along the axial direction every 300mm.

[0075] More preferably, the radial connecting rod 610 and the support plate 620 are made of wood.

[0076] In other embodiments, the bottom end of the radial connecting rod 610 may also be threaded into the insertion slot.

[0077] In one specific embodiment, such as Figure 2 As shown, both the upper insulation pipe 400 and the lower insulation pipe 500 are semi-circular pipes. After the two sides of the upper insulation pipe 400 are sealed and connected to the two sides of the lower insulation pipe 500, a complete circular pipe can be formed, so that the cross-section of the test chamber 700 is circular. At the same time, the support plate 620 at the top of the insulating bracket 600 is an arc plate, and the arc plate is coaxial with the lower insulation pipe 500.

[0078] This configuration is because: when performing a current-carrying capacity test on the test cable 900, it is necessary to place the test cable 900 in a high-temperature environment with uniform temperature (e.g., 40°C); in this embodiment, both the upper insulation pipe 400 and the lower insulation pipe 500 are set as semi-circular pipes, so that a circular test cavity 700 can be formed by connecting the upper insulation pipe 400 and the lower insulation pipe 500; with the arc-shaped support plate 620 coaxially installed in the test cavity 700, the test cable 900 can be coaxially fixed in the test cavity 700, and when a heating current is applied to the test cable 900, the heat radiation received by the test cavity 700 in all directions is ensured to be the same, so as to ensure that the temperature of the test cavity 700 is the same in all directions.

[0079] In one specific embodiment, such as Figure 2 As shown, a number of rollers 630 are provided on the support plate 620 at the top of the insulating bracket 600. These rollers 630 are linearly distributed along the circumference of the bend section 100 and the straight section 20. The rollers 630 are rotatably mounted on the support plate 620, and the rotation direction of the rollers 630 is tangent to the axial direction of the bend section 100 or the straight section 200. This allows the test cable 900 to move rapidly along the axial direction of the bend section 100 or the straight section 200 under the rolling action of the rollers 630 after being placed on the rollers 630.

[0080] This design is based on the fact that large-section cables are characterized by their large size and weight, making the labor intensity high when fixing the test cable 900 inside the bend section 100 and the straight section 200. In this embodiment, the support plate 620 is equipped with a non-powered roller 630 on the side facing the test cable 900. After the test cable 900 is placed on the roller 630 of the support plate 620, when the test cable 900 is pulled, the rolling of the roller 630 changes the sliding connection between the test cable 900 and the support plate 620 to a rolling connection, reducing the friction between the test cable 900 and the support plate 620, thus facilitating the axial movement of the test cable 900. At the same time, two test cables 900 can also be axially fixedly connected, and the replacement of the two test cables 900 can be achieved by the axial movement of the test cable 900 on the support plate 620.

[0081] In one specific embodiment, such as Figure 5 As shown, the length of the radial connecting rod 610 of the insulating bracket 600 is adjustable.

[0082] This is because the length of the radial connecting rod 610 is adjustable, and the height of the support plate 620 in the test cavity 700 can be changed by adjusting the length of the radial connecting rod 610, thereby making the test cables 900 of different radial sizes coaxial with the test cavity 700.

[0083] Specifically, such as Figure 5 As shown, the radial connecting rod 610 includes an upper connecting rod 611, an adjusting sleeve 612, and a lower connecting rod 613. The top end of the upper connecting rod 611 is fixedly connected to the support plate 620, and the bottom end is threaded into the inner cavity of the adjusting sleeve 612. The bottom end of the lower connecting rod 613 is connected to the lower insulation pipe 500, and the top end is threaded into the inner cavity of the adjusting sleeve 612, so that the distance between the lower support plate 620 and the lower insulation pipe 500 can be adjusted by rotating the adjusting sleeve 612.

[0084] This configuration is because: by threading the upper connecting rod 611 to the top end of the adjusting sleeve 612 and threading the lower connecting rod 613 to the bottom end of the adjusting sleeve 612, the rotation of the adjusting sleeve 612 can drive the upper connecting rod 611 and the lower connecting rod 613 to move up and down in opposite directions, thereby achieving the length adjustment of the radial connecting rod 610.

[0085] In one specific embodiment, such as Figure 2As shown, the upper insulation pipe 400 includes an upper rigid insulation outer layer 410 and an upper flexible insulation inner layer 420, with the upper rigid insulation outer layer 410 disposed above the upper flexible insulation inner layer 420 and fixedly connected to it; the lower insulation pipe 500 includes a lower rigid insulation outer layer 510 and a lower flexible insulation inner layer 520, with the lower rigid insulation outer layer 510 disposed below the lower flexible insulation inner layer 520 and fixedly connected to it.

[0086] The two sides of the upper rigid insulation outer layer 410 can be snapped and fixedly connected to the two sides of the lower rigid insulation outer layer 510. At the same time, the two sides of the upper flexible insulation inner layer 420 abut against the two sides of the lower flexible insulation inner layer 520. The connection seam between the upper rigid insulation outer layer 410 and the lower rigid insulation outer layer 510 is staggered with the connection seam between the upper flexible insulation inner layer 420 and the lower flexible insulation inner layer 520 to improve the sealing performance of the connection between the upper insulation pipe 400 and the lower insulation pipe 500.

[0087] This design is because: the upper insulation pipe 400 and the lower insulation pipe 500 are connected by a snap-fit ​​joint, which facilitates the quick disassembly and installation of the entire testing device; at the same time, both the upper insulation pipe 400 and the lower insulation pipe 500 adopt a double-layer insulation structure, which helps to reduce the loss of heat inside the testing chamber 700, thereby maintaining the stability of the internal temperature of the testing chamber 700.

[0088] Preferred, such as Figure 2 As shown, the upper insulation pipe 400 has a left-right symmetrical structure, and the central angle corresponding to the upper flexible insulation inner layer 420 is smaller than the central angle corresponding to the upper rigid insulation outer layer 410; the lower insulation pipe 500 has a left-right symmetrical structure, and the central angle corresponding to the lower rigid insulation outer layer 510 is smaller than the central angle corresponding to the lower flexible insulation inner layer 520.

[0089] It should be noted that the snap-fit ​​structure between the upper rigid insulation outer layer 410 and the lower rigid insulation outer layer 510 is existing technology and will not be described in detail here.

[0090] In one specific embodiment, such as Figure 2 As shown, a balance frame 800 is fixedly connected below the lower insulation pipe 500. There are multiple balance frames 800, which are evenly distributed along the axial direction of the bend section 100 and the straight pipe section 200 to support the bend section 100 and the straight pipe section 200 to maintain the stability of the testing device. At the same time, the balance frame 800 suspends both ends of each extension pipe 210 of the bend section 100 and the straight pipe section 200 to facilitate the insertion and connection of the male connector 211 and the female connector 212 of two adjacent extension pipes 210.

[0091] Preferred, such as Figure 2As shown, the bend section 100 is a U-shaped pipe, and male connectors 211 are provided at both ends of the U-shaped pipe for quick connection and fixation of one end of the bend section 100 and the straight pipe section 200.

[0092] This configuration is because the test cable 900 needs to be arranged in a U-shape when performing a current-carrying capacity test on the test cable 900.

[0093] Example: A cable current-carrying capacity test method capable of simulating a high-temperature environment, the method includes the following steps:

[0094] S10: Place the test cable 900 in the sealed and insulated tubular test cavity 700, with both ends of the test cable 900 extending axially out of the test cavity 700.

[0095] S20: Apply a heating current to the test cable 900 until the temperature of the test chamber 700 reaches the test temperature.

[0096] S30: Apply test current to test cable 900 and obtain the current carrying capacity test data of test cable 900.

[0097] The test current is less than the heating current.

[0098] This application employs a self-heating insulation method for cables. First, the test cable 900 is placed coaxially in the tubular test chamber 700 along the axial direction. Then, a heating current is passed through the test cable 900, and the temperature of the test chamber 700 is raised to the required test temperature by utilizing the heat dissipation when the test cable 900 is energized. Finally, a test current is passed through the test cable 900 to obtain the cable current carrying capacity data in a high-temperature environment.

[0099] The testing device of this invention is used as follows:

[0100] First, fix a U-shaped lower insulation pipe 500 at the test site. Then, connect multiple straight lower insulation pipes 500 to both ends of the U-shaped lower insulation pipe 500 in sequence. The total length of the straight lower insulation pipes 500 must meet the test requirements of the test cable 900.

[0101] Based on the weight of the test cable 900, multiple insulating brackets 600 are fixedly connected to the lower insulation pipe 500, and the height of the support plate 620 of the insulating brackets 600 is adjusted according to the radial dimension of the test cable 900.

[0102] First, pass one end of the test cable 900 through the inlet / outlet 311 of the insulation end cap 300 at the end of a straight pipe section 200 and place it on the support plate 620. Then, pull the test cable 900 along the axis of the lower insulation pipe 500 until one end of the test cable 900 extends out from the insulation end cap 300 at the end of another straight pipe section 200.

[0103] First, fix a U-shaped upper insulation pipe 400 and a U-shaped lower insulation pipe 500 together. Then, fix multiple straight upper insulation pipes 400 and straight lower insulation pipes 500 together in sequence.

[0104] The two insulated end caps 300 are fixedly connected to the ends of the two straight pipe sections 200.

[0105] First, apply a heating current to the test cable 900 through an external current source (the heating current must be less than the theoretically calculated maximum safe current) so that the heat dissipated by the test cable 900 after its temperature rises is concentrated in the test chamber 700. Then, observe the real-time temperature rise in the test chamber 700 through the built-in thermocouple until it reaches the test temperature required for the test, which is the high-temperature ambient temperature.

[0106] A test current is applied to the test cable 900 by an external current source, and the current carrying capacity test data of the test cable 900 is obtained.

[0107] Compared with the prior art, this application has at least the following beneficial technical effects:

[0108] (1) The testing device of the present invention has the advantages of simple configuration, low investment, small footprint and low requirements for test site.

[0109] (2) The testing device of the present invention can be placed flexibly and freely, is lightweight, and is easy to move.

[0110] (3) The test device of the present invention can be adjusted in axial length (increase or decrease in the number of extension tubes) according to the length of the test cable, and can be disassembled and stored after the test is completed for easy use next time.

[0111] (4) The testing device of the present invention does not require an additional heating module. It uses the temperature generated by the current carrying capacity test of the test cable to conduct the test, thereby achieving the purpose of energy saving, emission reduction and green carbon reduction.

[0112] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A cable ampacity test apparatus capable of simulating high temperature environments, characterized by, The utility model relates to a test cable heat preservation device, which comprises: a bent pipe section (100); two straight pipe sections (200) connected to the bent pipe section (100) at one end; two heat preservation end covers (300) connected to the other end of the straight pipe sections (200) and provided with inlets and outlets (311) for test cables (900); wherein the bent pipe section (100) and the straight pipe sections (200) each comprise an upper heat preservation pipe (400), a lower heat preservation pipe (500), and an insulation support (600), the upper heat preservation pipe (400) is connected to the lower heat preservation pipe (500) at both sides to form a test cavity (700) for accommodating the test cable (900), and a plurality of the insulation supports (600) are distributed along the axial direction of the test cavity (700) and connected to the lower heat preservation pipe (500) to support the test cable (900) radially; wherein, when carrying out ampacity test on the test cable (900), first, the test cable (900) is supplied with a heating current to make the temperature of the test cavity (700) reach a test temperature, and then the test cable (900) is supplied with a test current less than the heating current.

2. The cable ampacity test device capable of simulating high temperature environment according to claim 1, wherein, The axial length of the straight pipe section (200) can be adjusted.

3. The cable ampacity test apparatus capable of simulating high temperature environments of claim 2, wherein, The straight pipe section (200) comprises a plurality of lengthening pipes (210) arranged in sequence and connected sealingly, and one end of the lengthening pipe (210) is provided with a male joint (211) and the other end is provided with a female joint (212) capable of sealingly inserting and connecting with the male joint (211).

4. The cable ampacity test apparatus capable of simulating high temperature environment of claim 1, wherein, The radial dimension of the inlet and outlet (311) can be adjusted.

5. The cable ampacity test apparatus capable of simulating high temperature environments of claim 4, wherein, The heat preservation end cover (300) comprises an elastic heat insulation part (310) and a rigid connecting part (320), the rigid connecting part (320) is detachably fixedly connected to the end of the straight pipe section (200), the elastic heat insulation part (310) is arranged between the rigid connecting part (320) and the straight pipe section (200) and is provided with the inlet and outlet (311).

6. The cable ampacity test apparatus capable of simulating high temperature environments of claim 1, wherein, The bottom end of the insulation support (600) is detachably fixedly connected to the lower heat preservation pipe (500), and the distance between two adjacent insulation supports (600) can be adjusted.

7. The cable ampacity test apparatus capable of simulating high temperature environments of claim 6, wherein, The insulation support (600) comprises a radial connecting rod (610) and a support plate (620), the bottom end of the radial connecting rod (610) is inserted and fixed in the insertion groove of the lower heat preservation pipe (500), and the top end is fixedly connected to the support plate (620).

8. The cable ampacity test apparatus capable of simulating high temperature environment according to claim 6, wherein, The support plate (620) is an arc plate coaxial with the lower heat preservation pipe (500); and / or The support plate (620) is provided with a roller (630) for axial movement of the test cable (900).

9. The cable ampacity test apparatus capable of simulating high temperature environments of claim 1, wherein, The upper heat preservation pipe (400) comprises an upper rigid heat preservation outer layer (410) and an upper flexible heat preservation inner layer (420), and the lower heat preservation pipe (500) comprises a lower rigid heat preservation outer layer (510) and a lower flexible heat preservation inner layer (520); the two sides of the upper rigid heat preservation outer layer (410) can be clamped with the two sides of the lower rigid heat preservation outer layer (510), the two sides of the upper flexible heat preservation inner layer (420) abut against the two sides of the lower flexible heat preservation inner layer (520), and the connecting seams of the upper rigid heat preservation outer layer (410) and the lower rigid heat preservation outer layer (510) are arranged in a staggered manner with the connecting seams of the upper flexible heat preservation inner layer (420) and the lower flexible heat preservation inner layer (520).

10. A method for testing the current-carrying capacity of a cable in a high temperature environment, using the device for testing the current-carrying capacity of a cable in a high temperature environment according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: S10: placing a test cable (900) in a sealed heat preservation tubular test chamber (700), and the two ends of the test cable (900) extending out of the test chamber (700); S20: passing a heating current through the test cable (900) until the temperature of the test chamber (700) reaches a test temperature; S30: passing a test current through the test cable (900) and acquiring the current-carrying capacity data of the test cable (900); wherein the test current is less than the heating current.

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