An electrical performance detection test platform for the buffer layer of high-voltage XLPE cables

Abstract

The present invention discloses an electrical performance detection test platform for the buffer layer of high-voltage XLPE cables, belonging to the technical field of cable electrical performance testing equipment, which includes: a testing machine, inside which a control host is installed, and a test chamber is arranged on one side of the testing machine; a wire laying unit, vertically arranged and distributed on the test chamber; a power supply, arranged outside the testing machine, and an output switch is also installed on the power transmission cable; the control host is electrically connected to the relay switch of the power supply; a load simulation system, arranged in the testing machine, and the other ends of each high-voltage XLPE cable are connected to the load simulation system, and a voltage sensor is arranged in the testing machine; a variable temperature adjustment unit, arranged in the test chamber, and the variable temperature adjustment unit is used to adjust the test environment temperature and humidity of the high-voltage XLPE cable; the present invention can effectively simulate the electrical performance of high-voltage XLPE cables in a gradient temperature difference, and even the electrical changes of high-voltage XLPE cables in a state close to ablation.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable electrical performance testing equipment, and specifically relates to an electrical performance detection test platform for the buffer layer of high-voltage XLPE cables. Background Art

[0002] High-voltage XLPE (cross-linked polyethylene) cables are a type of cable widely used in power transmission systems. Especially in medium and high-voltage power systems, they have high heat resistance, better mechanical strength, longer service life, high tensile strength, wear resistance, and are suitable for long-term use.

[0003] Currently, before high-voltage XLPE (cross-linked polyethylene) cables are put into use, they are usually tested. Generally, direct wire erection testing in the natural environment is adopted, where the cables are exposed to the natural environment. Although it can truly reflect the performance of the cables in actual use, its test cycle is long, it is greatly affected by the natural environment, and the test environment cannot be effectively controlled. In the prior art, such as the invention patent with the publication number CN104991147A, it can select cables of a specific length for indoor test. By mainly adjusting parameters such as the bending radius of the test tube, the rotation speed of the driving motor, and the flow rate of the air flow, it can simulate different natural environments. Although the environmental test variables are controlled to a certain extent, it is impossible to carry out research on the electrical property change laws of the cables under different temperature, humidity, and pressure conditions. Especially for high-voltage XLPE cables, it is impossible to deeply test and understand the electrical property changes of their buffer layers under the influence of different factors and the ablation mechanism of the buffer layer, etc. The experimental limitations are high. Therefore, it is necessary to provide an electrical performance detection test platform for the buffer layer of high-voltage XLPE cables to solve the problems raised in the above background art. Summary of the Invention

[0004] To achieve the above object, the present invention provides the following technical solution: An electrical performance detection test platform for the buffer layer of high-voltage XLPE cables, which includes:

[0005] A testing machine, inside which a control host is installed, and a closed test chamber is arranged on one side of the testing machine;

[0006] A wire erection unit, vertically arranged and distributed on the test chamber, and a plurality of the wire erection units horizontally straighten the high-voltage XLPE cables in the test chamber;

[0007] A power supply, arranged outside the testing machine, and the power supply is electrically connected to each high-voltage XLPE cable through a plurality of power cables, and is used to provide the power voltage for each high-voltage XLPE cable during the detection test. An output switch is also installed on the power cable; the control host is electrically connected to the relay switch of the power supply, so as to control the power supply switch through the relay;

[0008] A load simulation system is set in a testing machine. The other ends of the high-voltage XLPE cables are connected to the load simulation system. A voltage sensor is provided in the testing machine, and the output signal end of the voltage sensor is connected to the data acquisition module of the control host, which is used to monitor and record the voltage change during the testing process of the high-voltage XLPE cables. A leakage protector and an audible and visual alarm are also connected outside the control host.

[0009] A variable temperature adjustment unit is set in the test chamber. The variable temperature adjustment unit is used to adjust the temperature and humidity of the test environment of the high-voltage XLPE cables, so as to simulate different usage environments. Multiple high-voltage XLPE cables are in the same or different temperature and humidity conditions during the change and adjustment of the variable temperature adjustment unit.

[0010] The variable temperature adjustment unit includes:

[0011] A sealed chamber is set above the test chamber. A plurality of spray pipes arranged in parallel are arranged in the sealed chamber, and one end of each spray pipe is connected to a water supply pipe.

[0012] Spray nozzles are evenly distributed on each spray pipe. A channel is opened below the sealed chamber, and the spray nozzles are vertically connected in each channel.

[0013] A back plate is vertically fixed in the test chamber. An electric heater is arranged in the back plate, which is used to assist in adjusting the internal temperature of the test chamber.

[0014] A temperature and humidity sensor is set in the test chamber.

[0015] Contact temperature control mechanisms are arranged in one-to-one correspondence with the high-voltage XLPE cables. The contact temperature control mechanisms are all horizontally arranged in the test chamber, and each contact temperature control mechanism independently controls the temperature of the high-voltage XLPE cables.

[0016] Preferably, the wire laying unit includes:

[0017] Two symmetrically arranged wire pipes are horizontally fixed on both sides of the test chamber respectively. Inner rubber rings are fixed on the outer walls of the test chamber inside the wire pipes.

[0018] Outer rubber rings are fixed on the inner wall of the test chamber and are coaxially arranged with the wire pipes.

[0019] A sleeve is concentrically arranged at one end of each wire pipe far from the inner rubber ring. A number of clamping plates are circumferentially distributed in the sleeve, and each clamping plate is radially slidably arranged in the sleeve.

[0020] The guide sleeve is slidably sleeved on the casing. An extension part is fixed to one end face of each clamping plate. A pressing block corresponding to the clamping plate is fixed on the inner wall of the guide sleeve. The pressing block abuts against the extension part of the clamping plate, and the contact surface thereof is set as an inclined plane structure;

[0021] The electric telescopic rod is installed above the casing through a bracket. A top rod is hinged on the bracket. One end of the top rod is connected to the electric telescopic rod, and the other end thereof contacts the guide sleeve under the telescopic adjustment of the electric telescopic rod.

[0022] Preferably, a return spring is connected between each clamping plate and the casing, and each clamping plate slides away from the center of the casing under the elastic force of the return spring without external force; A compression spring is further sleeved outside the casing, and one end of the compression spring is connected to the guide sleeve;

[0023] The casing is in sealed sliding connection with the wire pipe, and a sealing ring cavity is formed at the connection thereof. A liquid channel is opened in the casing. The liquid channel is communicated with the sealing ring cavity, and a hydraulic pipe is connected outside the liquid channel.

[0024] Preferably, after the wire laying unit clamps both ends of the high-voltage XLPE cable, the hydraulic pipe adjusts the internal hydraulic pressure of the sealing ring cavity to enable the wire laying unit to traction both ends of the high-voltage XLPE cable in the reverse or opposite direction, so that the high-voltage XLPE cable is in a taut or slack state.

[0025] Preferably, the contact type temperature control mechanism includes:

[0026] The frame is horizontally fixed in the test chamber, and a connecting rod is slidably connected to the frame;

[0027] The fixing plate is fixed to one end of the connecting rod. An air impulse telescopic rod is fixedly arranged in parallel on the frame, and the telescopic end of the air impulse telescopic rod is connected to the fixing plate;

[0028] The guide rail bracket is arranged in parallel on one side of the connecting rod. A rotating connection part is arranged on the fixing plate, and the guide rail bracket is fixed to the rotating connection part;

[0029] There are a plurality of heat conducting sleeves arranged in a row. A plurality of sliders are slidably connected to the guide rail bracket. Each heat conducting sleeve is fixed to the slider respectively. The cross section of each heat conducting sleeve is in an inverted U-shaped structure, and each heat conducting sleeve slidably contacts above the surface of the high-voltage XLPE cable.

[0030] Preferably, one end face of the heat conduction sleeve is hinged with a coupling frame, the coupling frame is arranged as a foldable X-shaped structure, the coupling frames on adjacent heat conduction sleeves are hinged to each other, a fine adjustment telescopic rod is vertically connected to the middle of the guide rail support, and one end of the fine adjustment telescopic rod is connected to the hinged ends of two coupling frames in the middle.

[0031] Preferably, a heat conduction layer is arranged in the heat conduction sleeve, a flow channel is arranged in the heat conduction layer, the flow channel is distributed in an S shape, and a liquid inlet pipeline and a liquid discharge pipeline are connected to the heat conduction sleeve, and the liquid inlet pipeline and the liquid discharge pipeline are respectively connected to both ends of the flow channel.

[0032] Preferably, a constant temperature water bath is arranged outside the test chamber, the liquid inlet pipeline and the liquid discharge pipeline are respectively communicated with the constant temperature water bath, and a refrigeration unit and a heating unit are installed outside the constant temperature water bath.

[0033] Preferably, a plurality of balls are symmetrically distributed in the heat conduction sleeve, and each ball is in rolling contact with the surface of the high-voltage XLPE cable.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] In the present invention, a plurality of high-voltage XLPE cables can be horizontally straightened in the test chamber through the wire laying unit, so that multi-cable tests can be carried out synchronously, the test efficiency can be improved, and comparative experiment operations can be realized. The mainly arranged variable temperature adjustment unit can not only adjust the humidity of the test chamber through the spray pipe, but also change the temperature of the test chamber through the heater in the back plate, thereby effectively changing the test environment of the high-voltage XLPE cable and simulating various environmental adjustments; especially for each independent high-voltage XLPE cable, a contact temperature control mechanism is also adopted to independently control the surface temperature thereof. The contact temperature control mechanism can form multi-point or local temperature control adjustment on the surface of the high-voltage XLPE cable by a plurality of heat conduction sleeves. On the one hand, it can provide differential test adjustment for each high-voltage XLPE cable, and on the other hand, it can effectively simulate the electrical performance of the high-voltage XLPE cable in the gradient temperature difference, and even the electrical change of the high-voltage XLPE cable in a state close to ablation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic structural diagram of the system of the present invention;

[0037] Figure 2 is a front view of the internal structure of the variable temperature adjustment unit of the present invention;

[0038] Figure 3 is a schematic three-dimensional structure diagram of the variable temperature adjustment unit of the present invention;

[0039] Figure 4 is Figure 3Schematic enlarged view of the structure at A in the [Chinese context];

[0040] Figure 5 Schematic cross-sectional structure view of the wire laying unit in the present invention;

[0041] Figure 6 Schematic three-dimensional structure view of the contact temperature control mechanism in the present invention;

[0042] Figure 7 Schematic distribution structure view of the coupling frame in the present invention;

[0043] Figure 8 Cross-sectional view of the heat conducting sleeve in the present invention;

[0044] Figure 9 Schematic partial structure view of the flow gap channel in the present invention;

[0045] In the figure: 1. Testing machine; 11. Control host; 12. Power supply; 13. Output switch; 14. Leakage protector; 15. Acousto-optic alarm; 2. Test chamber; 3. Wire laying unit; 31. Pipe; 32. Inner rubber ring; 33. Outer rubber ring; 34. Sleeve; 35. Splint; 36. Guide sleeve; 37. Extension part; 38. Electric telescopic rod; 39. Thrust rod; 310. Liquid channel; 4. Variable temperature adjustment unit; 41. Sealed chamber; 42. Spray pipe; 43. Spray head; 44. Back plate; 5. Contact temperature control mechanism; 51. Frame; 52. Connecting rod; 53. Pneumatic impulse telescopic rod; 54. Fixed plate; 55. Guide rail support; 56. Coupling frame; 57. Fine adjustment telescopic rod; 6. Heat conducting sleeve; 61. Heat conducting layer; 62. Flow gap channel; 63. Liquid inlet pipeline; 64. Liquid discharge pipeline; 65. Ball. Detailed implementation manners

[0046] Please refer to Figures 1-9 , in the embodiment of the present invention, a test platform for detecting the electrical performance of the buffer layer of high-voltage XLPE cables includes:

[0047] A testing machine 1, inside which a control host 11 is installed. On one side of the testing machine 1, there is a closed test chamber 2, which has certain heat preservation and protection properties to ensure the safe progress of the test;

[0048] A wire laying unit 3, vertically arranged and distributed on the test chamber 2. A plurality of the wire laying units 3 horizontally straighten the high-voltage XLPE cables in the test chamber 2. The wire laying unit 3 can clamp and erect the ends of high-voltage XLPE cables of different specifications;

[0049] The power supply 12 is arranged outside the testing machine 1. The power supply 12 is electrically connected to each high-voltage XLPE cable through a plurality of transmission cables, and is used to provide the power voltage in the detection test for each high-voltage XLPE cable. An output switch 13 is also installed on the transmission cable; the control host 11 is electrically connected to the relay switch of the power supply 12, so as to control the switch of the power supply 12 through the relay;

[0050] The load simulation system is arranged in the testing machine 1. The other ends of the high-voltage XLPE cables are connected to the load simulation system. A voltage sensor is arranged in the testing machine 1. The output signal end of the voltage sensor is connected to the data acquisition module of the control host 11, and is used to monitor and record the voltage change during the test of the high-voltage XLPE cable; A leakage protector 14 and an audible and visual alarm 15 are also connected outside the control host 11;

[0051] The variable temperature regulation unit 4 is arranged in the test chamber 2. The variable temperature regulation unit 4 is used to regulate the temperature and humidity of the test environment of the high-voltage XLPE cable, so as to simulate different use environments; Multiple high-voltage XLPE cables are in the same or different temperature and humidity conditions during the change and regulation of the variable temperature regulation unit 4;

[0052] The variable temperature regulation unit 4 includes:

[0053] The sealed chamber 41 is arranged above the test chamber 2. A plurality of parallel spray pipes 42 are arranged in the sealed chamber 41. One end of each spray pipe 42 is connected to a water supply pipe;

[0054] The spray heads 43 are evenly distributed on each spray pipe 42. A channel is opened below the sealed chamber 41. The spray heads 43 are vertically connected in each channel; that is to say, the spray heads 43 can perform spraying operations from above the test chamber 2, so as to change the internal humidity of the test chamber 2;

[0055] The back plate 44 is vertically fixed in the test chamber 2. An electric heater is arranged in the back plate 44, and is used to assist in regulating the internal temperature of the test chamber 2;

[0056] The temperature and humidity sensor is arranged in the test chamber 2;

[0057] The contact temperature control mechanism 5 is arranged corresponding to each high-voltage XLPE cable. The contact temperature control mechanisms 5 are all horizontally arranged in the test chamber 2. Each contact temperature control mechanism 5 independently controls the temperature of the high-voltage XLPE cable, so as to realize the differential temperature control test of each high-voltage XLPE cable and facilitate the control test.

[0058] In this embodiment, the wire laying unit 3 includes:

[0059] There are two symmetrically arranged wire tubes 31, and each of the wire tubes 31 is horizontally fixed on both sides of the test chamber 2. An inner rubber ring 32 is fixed on the outer wall of the test chamber 2 inside the wire tube 31.

[0060] An outer rubber ring 33 is fixed on the inner wall of the test chamber 2 and is coaxially arranged with the wire tube 31. The outer rubber ring 33 and the inner rubber ring 32 can hermetically surround the high-voltage XLPE cable after it is straightened, thereby ensuring the internal tightness of the test chamber 2.

[0061] A sleeve 34 is concentrically arranged at one end of each wire tube 31 away from the inner rubber ring 32. A plurality of clamping plates 35 are circumferentially distributed inside the sleeve 34, and each clamping plate 35 is radially slidably arranged inside the sleeve 34.

[0062] A guide sleeve 36 is slidably sleeved on the sleeve 34. An extension part 37 is fixed on one side end face of each clamping plate 35. A pressing block corresponding to the clamping plate 35 is fixed on the inner wall of the guide sleeve 36. The pressing block abuts against the extension part 37 of the clamping plate 35, and its contact surface is set as an inclined plane structure.

[0063] An electric telescopic rod 38 is installed above the sleeve 34 through a bracket. A top rod 39 is hinged on the bracket. One end of the top rod 39 is connected to the electric telescopic rod 38, and the other end thereof contacts the guide sleeve 36 under the telescopic adjustment of the electric telescopic rod 38. That is to say, when the electric telescopic rod 38 contracts and adjusts, it can deflect the top rod 39 clockwise. At this time, the end of the top rod 39 pushes the guide sleeve 36 to slide horizontally, so that the pressing block on the guide sleeve 36 pushes the clamping plate 35 towards the center of the sleeve 34 through the extension part 37 during sliding, thereby forming a clamping effect on the high-voltage XLPE cable by the clamping plate 35.

[0064] As a preferred embodiment, a return spring (not shown in the figure) is connected between each clamping plate 35 and the sleeve 34, and the clamping plate 35 slides away from the center of the sleeve 34 under the elastic force of the return spring without external force. A compression spring (not shown in the figure) is also sleeved outside the sleeve 34, and one end of the compression spring is connected to the guide sleeve 36. It can push the guide sleeve 36 towards the side close to the top rod 39 under the elastic force.

[0065] The sleeve 34 is hermetically and slidably connected to the wire tube 31, and a sealing ring cavity is formed at the connection. A liquid channel 310 is opened inside the sleeve 34. The liquid channel 310 is communicated with the sealing ring cavity, and a hydraulic pipe is connected to the outside of the liquid channel 310.

[0066] In this embodiment, after the wire laying unit 3 clamps both ends of the high-voltage XLPE cable, the internal hydraulic pressure of the sealing ring cavity is adjusted to make the wire laying unit 3 traction the two ends of the high-voltage XLPE cable in the reverse or opposite direction, so that the high-voltage XLPE cable is in a taut or relaxed state, thereby effectively changing the stretching effect of the buffer layer in each high-voltage XLPE cable, so as to test the insulation performance, partial discharge characteristics, withstand voltage performance, etc. of the buffer layer in the XLPE cable under different stretching states.

[0067] In this embodiment, the contact temperature control mechanism 5 includes:

[0068] A frame 51, horizontally fixed in the test chamber 2, and a connecting rod 52 is slidably connected to the frame 51;

[0069] A fixing plate 54, fixed to one end of the connecting rod 52, and a pneumatic impulse telescopic rod 53 is fixedly arranged in parallel on the frame 51, and the telescopic end of the pneumatic impulse telescopic rod 53 is connected to the fixing plate 54;

[0070] A guide rail bracket 55, arranged in parallel on one side of the connecting rod 52, a rotating connection part is arranged on the fixing plate 54, and the guide rail bracket 55 is fixed to the rotating connection part;

[0071] There are a plurality of heat conduction sleeves 6 arranged in a row, and several sliders are slidably connected to the guide rail bracket 55. Each heat conduction sleeve 6 is respectively fixed to the slider. The cross section of the heat conduction sleeve 6 is in an inverted U-shaped structure. Each heat conduction sleeve 6 is in sliding contact above the surface of the high-voltage XLPE cable. Among them, the pneumatic impulse telescopic rod 53 can continuously drive the guide rail bracket 55 on the connecting rod 52 to perform horizontal reciprocating displacement at a certain frequency, so that each heat conduction sleeve 6 can control the temperature of the XLPE cable surface during fixed-point or continuous displacement adjustment, effectively changing the temperature of the buffer layer in the XLPE cable; at the same time, a plurality of heat conduction sleeves 6 can form a local temperature difference on the surface of the XLPE cable, so as to effectively simulate the electrical property changes of the high-voltage XLPE cable under extreme temperature differences;

[0072] In this embodiment, a connecting shaft frame 56 is hinged to one end face of the heat conduction sleeve 6. The connecting shaft frame 56 is arranged as a foldable X-shaped structure. The connecting shaft frames 56 on adjacent heat conduction sleeves 6 are hinged to each other. A fine adjustment telescopic rod 57 is vertically connected to the middle of the guide rail bracket 55, and one end of the fine adjustment telescopic rod 57 is connected to the hinged end of the two connecting shaft frames 56 in the middle.

[0073] As a preferred embodiment, a heat conduction layer 61 is provided inside the heat conduction sleeve 6. A circulation gap 62 is provided in the heat conduction layer 61. The circulation gap 62 is distributed in an S shape. A liquid inlet pipeline 63 and a liquid discharge pipeline 64 are connected to the heat conduction sleeve 6. The liquid inlet pipeline 63 and the liquid discharge pipeline 64 are respectively connected to both ends of the circulation gap 62, so that high- and low-temperature heat conduction liquid can be circulated and transported through the liquid inlet pipeline 63 to the circulation gap 62 to achieve temperature adjustment of the surface of the XLPE cable.

[0074] In this embodiment, a constant temperature water bath (not shown in the figure) is provided outside the test chamber 2. The liquid inlet pipeline 63 and the liquid discharge pipeline 64 are respectively connected to the constant temperature water bath. A refrigeration unit and a heating unit are installed outside the constant temperature water bath. The refrigeration unit and the heating unit can heat up or cool down the heat conduction liquid, so that the heat conduction liquid can reach high and low temperatures, and the temperature range is from -20°C to 200°C.

[0075] In this embodiment, a plurality of balls 65 are symmetrically distributed inside the heat conduction sleeve 6, and each of the balls 65 is in rolling contact with the surface of the high-voltage XLPE cable.

[0076] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered within the protection scope of the present invention.

Claims

1. An electrical performance detection test platform for the buffer layer of high-voltage XLPE cables, characterized in that, It includes: A testing machine, inside which a control host is installed, and a closed testing chamber is arranged on one side of the testing machine; A wire laying unit, vertically arranged and distributed on the testing chamber, and multiple wire laying units horizontally straighten the high-voltage XLPE cables in the testing chamber; A power supply, arranged outside the testing machine, and the power supply is electrically connected to each high-voltage XLPE cable through multiple power transmission cables, and is used to provide the power voltage in the detection test for each high-voltage XLPE cable. An output switch is also installed on the power transmission cable; the control host is electrically connected to the relay switch of the power supply, so as to control the power supply switch through the relay; A load simulation system, arranged in the testing machine, and the other ends of each high-voltage XLPE cable are connected to the load simulation system. A voltage sensor is arranged in the testing machine, and the output signal end of the voltage sensor is connected to the data acquisition module of the control host, and is used to monitor and record the voltage change during the test of the high-voltage XLPE cable; A leakage protector and an audible and visual alarm are also connected outside the control host; A variable temperature adjustment unit, arranged in the testing chamber, and the variable temperature adjustment unit is used to adjust the temperature and humidity of the test environment of the high-voltage XLPE cable, so as to simulate different usage environments; Multiple high-voltage XLPE cables are in the same or different temperature and humidity conditions during the change and adjustment of the variable temperature adjustment unit; The variable temperature adjustment unit includes: A sealed chamber, arranged above the testing chamber, and multiple parallel spray pipes are arranged in the sealed chamber, and one end of each spray pipe is connected to a water supply pipe; Spray nozzles, evenly distributed on each spray pipe, and a channel is opened below the sealed chamber, and the spray nozzles are vertically connected in each channel; A back plate, vertically fixed in the testing chamber, and an electric heater is arranged inside the back plate, and is used to assist in adjusting the internal temperature of the testing chamber; A temperature and humidity sensor, arranged in the testing chamber; A contact type temperature control mechanism, arranged in one-to-one correspondence with each high-voltage XLPE cable, and the contact type temperature control mechanisms are all horizontally arranged in the testing chamber, and each contact type temperature control mechanism independently controls the temperature of the high-voltage XLPE cable; The wire laying unit includes: Two symmetrically arranged wire pipes, each wire pipe is horizontally fixed on both sides of the testing chamber respectively, and an inner rubber ring is fixed on the outer wall of the testing chamber inside the wire pipe; An outer rubber ring, fixed on the inner wall of the testing chamber and coaxially arranged with the wire pipe; A sleeve, concentrically arranged on one end of each wire pipe away from the inner rubber ring, and several clamping plates are circumferentially distributed inside the sleeve, and each clamping plate is radially slidably arranged inside the sleeve; A guide sleeve, slidably sleeved on the sleeve, and an extension part is fixed on one end face of each clamping plate, and a pressing block corresponding to the clamping plate is fixed on the inner wall of the guide sleeve, and the pressing block abuts against the extension part of the clamping plate, and its contact surface is set as an inclined plane structure.

2. The electrical performance detection test platform for the buffer layer of high-voltage XLPE cables according to claim 1, characterized in that: The wire laying unit further includes: An electric telescopic rod, installed above the sleeve through a bracket, a top rod is hinged on the bracket, one end of the top rod is connected to the electric telescopic rod, and the other end of the top rod contacts the guide sleeve under the telescopic adjustment of the electric telescopic rod.

3. The electrical performance detection test platform for the buffer layer of high-voltage XLPE cables according to claim 2, characterized in that: A return spring is connected between each of the clamping plates and the sleeve, and the clamping plate slides away from the center of the sleeve by the elastic force of the return spring without external force; A compression spring is also sleeved outside the sleeve, and one end of the compression spring is connected to the guide sleeve; The sleeve is in sealed sliding connection with the wire pipe, and a sealing ring cavity is formed at the connection, a liquid passage is opened in the sleeve, the liquid passage is communicated with the sealing ring cavity, and a hydraulic pipe is connected outside the liquid passage.

4. An electrical performance detection test platform for a buffer layer of a high-voltage XLPE cable according to claim 3, characterized in that: After the wire laying unit clamps both ends of the high-voltage XLPE cable, the internal hydraulic pressure of the sealing ring cavity is adjusted through the hydraulic pipe, so that the wire laying unit pulls both ends of the high-voltage XLPE cable in the reverse or opposite direction, making the high-voltage XLPE cable in a taut or loose state.

5. An electrical performance detection test platform for a buffer layer of a high-voltage XLPE cable according to claim 1, characterized in that: The contact type temperature control mechanism includes: A frame, horizontally fixed in the test chamber, and a connecting rod is slidably connected to the frame; A fixing plate, fixed at one end of the connecting rod, an air-actuated pulse telescopic rod is horizontally fixed on the frame, and the telescopic end of the air-actuated pulse telescopic rod is connected to the fixing plate; A guide rail bracket, arranged parallel to the connecting rod, a rotating connection part is arranged on the fixing plate, and the guide rail bracket is fixed to the rotating connection part; A plurality of heat conducting sleeves are arranged in an array, several sliders are slidably connected to the guide rail bracket, each heat conducting sleeve is fixed to the slider respectively, the cross section of the heat conducting sleeve is in an inverted U-shaped structure, and each heat conducting sleeve is in sliding contact above the surface of the high-voltage XLPE cable.

6. An electrical performance detection test platform for a high-voltage XLPE cable buffer layer according to claim 5, characterized in that: A connecting shaft frame is hinged to one side end face of the heat conducting sleeve, the connecting shaft frame is set as a foldable X-shaped structure, the connecting shaft frames on adjacent heat conducting sleeves are hinged to each other, and a fine adjustment telescopic rod is vertically connected to the middle of the guide rail bracket, and one end of the fine adjustment telescopic rod is hinged to the hinged ends of two connecting shaft frames in the middle.

7. An electrical performance detection test platform for a buffer layer of a high-voltage XLPE cable according to claim 5, characterized in that: A heat conducting layer is arranged in the heat conducting sleeve, a flow-through gap channel is arranged in the heat conducting layer, the flow-through gap channel is distributed in an S shape, and an inlet liquid pipeline and an outlet liquid pipeline are connected to the heat conducting sleeve, and the inlet liquid pipeline and the outlet liquid pipeline are respectively connected to both ends of the flow-through gap channel.

8. An electrical performance detection test platform for the buffer layer of high-voltage XLPE cables according to claim 7, characterized in that: A constant temperature water bath is arranged outside the test chamber, the inlet liquid pipeline and the outlet liquid pipeline are respectively communicated with the constant temperature water bath, and a refrigeration unit and a heating unit are installed outside the constant temperature water bath.

9. The electrical performance detection test platform for the buffer layer of high-voltage XLPE cables according to claim 7, characterized in that: A plurality of balls are symmetrically distributed in the heat conducting sleeve, and each ball is in rolling contact with the surface of the high-voltage XLPE cable.

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