Electrical performance detection test platform for high-voltage XLPE cable buffer layer

Abstract

The invention discloses an electrical performance detection test platform for a high-voltage XLPE cable buffer layer, and belongs to the technical field of cable electrical performance test equipment, and the electrical performance detection test platform comprises a testing machine which is internally provided with a control host, and one side of the testing machine is provided with a test bin; the stringing units are vertically arranged and distributed on the test bin; the power supply is arranged outside the testing machine, and the power transmission cable is further provided with an output switch; the control host is electrically connected with a relay switch of the power supply; the load simulation system is arranged in the testing machine, the other end of each high-voltage XLPE cable is connected with the load simulation system, and a voltage sensor is arranged in the testing machine; the variable temperature adjusting unit is arranged in the test bin and is used for adjusting the temperature and humidity of the test environment of the high-voltage XLPE cable; according to the invention, the electrical performance of the high-voltage XLPE cable in the gradient temperature difference can be effectively simulated, and even the electrical change of the high-voltage XLPE cable in a state close to ablation can be effectively simulated.

Description

Technical Field

[0001] The invention belongs to the technical field of cable electrical performance testing equipment, in particular to an electrical performance testing platform for a high-voltage XLPE cable buffer layer. Background Art

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

[0003] At present, before high-voltage XLPE (cross-linked polyethylene) cables are put into use, they are tested. Usually, direct wiring tests are performed in natural environments to expose the cables to natural environments. Although the performance of the cables in actual use can be truly reflected, the test cycle is long and the cables are greatly affected by the natural environment, and the test environment cannot be effectively controlled. In the prior art, for example, the invention patent with publication number CN104991147A can select cables of a specific length for indoor testing, mainly by adjusting the bending radius of the test tube, the speed of the driving motor, the flow rate of the airflow and other parameters to simulate different natural environments. Although the environmental test variables are controlled to a certain extent, it is impossible to conduct research on the electrical property change law of the cables under different temperature, humidity and pressure conditions. Especially for high-voltage XLPE cables, it is impossible to conduct in-depth tests to understand the electrical property changes of the buffer layer under the influence of different factors and the ablation mechanism of the buffer layer, and the experimental limitations are high. Therefore, it is necessary to provide an electrical property detection test platform for the buffer layer of high-voltage XLPE cables to solve the problems raised in the above background technology. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: an electrical performance testing platform for a high-voltage XLPE cable buffer layer, comprising:

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

[0006] The wiring units are vertically arranged and distributed on the test chamber, and a plurality of the wiring units horizontally erect the high-voltage XLPE cable in the test chamber;

[0007] A power supply is arranged outside the test machine, and the power supply is electrically connected to each high-voltage XLPE cable through a plurality of transmission cables, and is used to provide each high-voltage XLPE cable with a power supply voltage in the detection test, and an output switch is also installed on the 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;

[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 cable.

[0016] Preferably, the wire laying unit includes:

[0017] There are two symmetrically arranged wire pipes. Each wire pipe is horizontally fixed on both sides of the test chamber, and an inner rubber ring is fixed on the outer wall of the test chamber inside the wire pipe.

[0018] An outer rubber ring is fixed on the inner wall of the test chamber and is coaxially arranged with the wire pipe.

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

[0020] A guide sleeve, a sliding sleeve is arranged on the sleeve, an extension portion is fixed to one end surface of each clamping plate, a pressing block corresponding to the clamping plate is fixed to the inner wall of the guide sleeve, the pressing block is in abutment with the extension portion of the clamping plate, and its contact surface is set as an inclined structure;

[0021] The electric telescopic rod is installed above the sleeve through a bracket, and a push rod is hinged on the bracket. One end of the push rod is connected to the electric telescopic rod, and the other end of the push rod contacts the guide sleeve as the electric telescopic rod is adjusted in telescopic manner.

[0022] Preferably, a return spring is connected between each of the clamping plates and the sleeve, and the clamping plates slide in a direction away from the center of the sleeve by the elastic force of the return spring in the absence of external force; a compression spring is also sleeved outside the sleeve, and one end of the compression spring is connected to the guide sleeve;

[0023] The sleeve is sealed and slidably connected to the wire tube, and a sealing ring cavity is formed at the connection point. A liquid channel is opened in the sleeve, the liquid channel is connected to the sealing ring cavity, and a hydraulic pipe is connected to the outside of the liquid channel.

[0024] Preferably, after the stringing unit completes clamping of both ends of the high-voltage XLPE cable, the hydraulic pipe adjusts the internal hydraulic pressure of the sealing ring cavity so that the stringing unit pulls the two ends of the high-voltage XLPE cable in opposite directions or towards each other, so that the high-voltage XLPE cable is in a taut or relaxed state.

[0025] Preferably, the contact temperature control mechanism comprises:

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

[0027] A fixed plate is fixed to one end of the connecting rod, a pneumatic pulse telescopic rod is fixed in parallel to the frame, and the telescopic end of the pneumatic pulse telescopic rod is connected to the fixed plate;

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

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

[0030] Preferably, a coupling is hinged on one end face of the heat-conducting sleeve, and the coupling is arranged as a foldable X-shaped structure. The couplings on adjacent heat-conducting sleeves are hinged to each other, and a fine-tuning telescopic rod is vertically connected to the middle of the guide rail bracket, and one end of the fine-tuning telescopic rod is connected to the hinged ends of the two couplings in the middle.

[0031] Preferably, a heat-conducting layer is provided in the heat-conducting sleeve, a flow gap is provided in the heat-conducting layer, the flow gap is distributed in an S shape, and a liquid inlet pipeline and a liquid discharge pipeline are connected to the heat-conducting sleeve, and the liquid inlet pipeline and the liquid discharge pipeline are respectively connected to the two ends of the flow gap.

[0032] Preferably, a constant temperature water bath is arranged outside the test chamber, the liquid inlet pipeline and the liquid discharge pipeline are respectively connected to 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-conducting sleeve, and each of the balls rolls and contacts the surface of the high-voltage XLPE cable.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] In the present invention, multiple high-voltage XLPE cables can be horizontally erected in a test chamber through a wiring unit, so that multiple cable tests can be carried out simultaneously, the test efficiency is improved, and comparative experimental operations are realized. The variable temperature adjustment unit mainly arranged can not only adjust the humidity of the test chamber through a spray pipe, but also change the temperature of the test chamber through a heater in a back plate, so as to effectively change the test environment of the high-voltage XLPE cable and simulate multiple environmental adjustments; in particular, for each independent high-voltage XLPE cable, a contact temperature control mechanism is also used to control its independent surface temperature. The contact temperature control mechanism can form multi-point or local temperature control and adjustment on the surface of the high-voltage XLPE cable by a plurality of heat-conductive sleeves, which can provide differential test adjustment for each high-voltage XLPE cable on the one hand, and can effectively simulate the electrical performance of the high-voltage XLPE cable in a gradient temperature difference, and even the electrical property changes of the high-voltage XLPE cable in a state close to ablation. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0039] Figure 4 for Figure 3A schematic diagram of the structure enlargement in the middle;

[0040] Figure 5 It is a schematic diagram of the cross-sectional structure of the wiring unit in the present invention;

[0041] Figure 6 It is a three-dimensional structural schematic diagram of the contact temperature control mechanism in the present invention;

[0042] Figure 7 It is a schematic diagram of the distribution structure of the coupling in the present invention;

[0043] Figure 8 is a cross-sectional view of the heat-conducting sleeve of the present invention;

[0044] Fig. 9 It is a schematic diagram of the local structure of the flow gap in the present invention;

[0045] In the figure: 1. Testing machine; 11. Control host; 12. Power supply; 13. Output switch; 14. Leakage protector; 15. Sound and light alarm; 2. Test chamber; 3. Wire rack unit; 31. Wire tube; 32. Inner rubber ring; 33. Outer rubber ring; 34. Casing; 35. Clamp; 36. Guide sleeve; 37. Extension; 38. Electric telescopic rod; 39. Push rod; 310. Liquid channel; 4. Variable temperature adjustment Section unit; 41. Sealing chamber; 42. Spray pipe; 43. Spray head; 44. Back plate; 5. Contact temperature control mechanism; 51. Rack; 52. Connecting rod; 53. Pneumatic pulse telescopic rod; 54. Fixed plate; 55. Guide rail bracket; 56. Coupling; 57. Fine-tuning telescopic rod; 6. Heat-conducting sleeve; 61. Heat-conducting layer; 62. Flow gap; 63. Liquid inlet pipeline; 64. Liquid discharge pipeline; 65. Ball. DETAILED DESCRIPTION

[0046] See also Figure 1-Figure 9 In an embodiment of the present invention, a test platform for detecting the electrical performance of a high-voltage XLPE cable buffer layer is provided, which comprises:

[0047] The test machine 1 has a control host 11 installed inside, and a closed test chamber 2 is provided on one side of the test machine 1, which has certain heat preservation and protection properties to ensure the safety of the test;

[0048] The wiring units 3 are arranged vertically and distributed on the test chamber 2. A plurality of the wiring units 3 horizontally erect the high-voltage XLPE cable in the test chamber 2. The wiring units 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 adjustment unit 4 is arranged in the test chamber 2. The variable temperature adjustment unit 4 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 4;

[0052] The variable temperature adjustment 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 adjusting 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 wire tubes 31 symmetrically arranged, each of which is horizontally fixed on two sides of the test chamber 2 , and an inner rubber ring 32 is fixed on the outer wall of the test chamber 2 in the wire tube 31 ;

[0060] The 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 seal and surround the high-voltage XLPE cable after it is straightened, thereby ensuring the internal sealing of the test chamber 2;

[0061] A sleeve 34 is co-centeredly arranged on one end of each of the wire tubes 31 away from the inner rubber ring 32 , and a plurality of clamping plates 35 are distributed on the inner circumference of the sleeve 34 , and each of the clamping plates 35 is radially slidably arranged in the sleeve 34 ;

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

[0063] The electric telescopic rod 38 is installed above the sleeve 34 through a bracket, and a push rod 39 is hinged on the bracket. One end of the push rod 39 is connected to the electric telescopic rod 38, and the other end thereof contacts the guide sleeve 36 as the electric telescopic rod 38 is telescopically adjusted. That is to say, when the electric telescopic rod 38 is contracted and adjusted, it can deflect the push rod 39 clockwise. At this time, the end of the push rod 39 pushes the guide sleeve 36 to slide horizontally, so that the pressure block on the guide sleeve 36 pushes the clamping plate 35 toward the center of the sleeve 34 through the extension portion 37 during sliding, so that the clamping plate 35 forms a clamping effect on the high-voltage XLPE cable.

[0064] As a preferred embodiment, a return spring (not shown in the figure) is connected between each of the clamping plates 35 and the sleeve 34, and the clamping plates 35 slide in a direction away from the center of the sleeve 34 by 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; the guide sleeve 36 can be pushed toward the side close to the ejector rod 39 under the action of the elastic force;

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

[0066] In this embodiment, after the hydraulic pipe completes clamping of the two ends of the high-voltage XLPE cable by the wiring unit 3, the internal hydraulic pressure of the sealing ring cavity is adjusted so that the wiring unit 3 pulls the two ends of the high-voltage XLPE cable in the opposite direction or in the opposite direction, so that the high-voltage XLPE cable is in a taut or relaxed state, thereby effectively changing the tensile effect of the buffer layer in each high-voltage XLPE cable, so as to test the insulation performance, partial discharge characteristics, and voltage resistance performance of the buffer layer in the XLPE cable under different tensile states.

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

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

[0069] A fixed plate 54 is fixed to one end of the connecting rod 52. A pneumatic pulse telescopic rod 53 is fixed in parallel to the frame 51. The telescopic end of the pneumatic pulse telescopic rod 53 is connected to the fixed plate 54.

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

[0071] The heat-conducting sleeves 6 are arranged in a plurality, and a plurality of sliders are slidably connected to the guide rail bracket 55. Each of the heat-conducting sleeves 6 is fixed to the slider, and the cross section of the heat-conducting sleeve 6 is an inverted U-shaped structure. Each of the heat-conducting sleeves 6 is in sliding contact with the surface of the high-voltage XLPE cable. The pneumatic pulse telescopic rod 53 can continuously work on the guide rail bracket 55 on the driving connecting rod 52 and move back and forth at a certain frequency, so that each heat-conducting sleeve 6 can control the temperature of the surface of the XLPE cable in a fixed point or continuous displacement adjustment, and effectively change the temperature of the buffer layer in the XLPE cable; at the same time, multiple heat-conducting sleeves 6 can form a local temperature difference on the surface of the XLPE cable, thereby effectively simulating the electrical property changes of the high-voltage XLPE cable under extreme temperature differences;

[0072] In this embodiment, a coupling 56 is hinged on one end face of the heat-conducting sleeve 6, and the coupling 56 is arranged to be a foldable X-shaped structure. The couplings 56 on adjacent heat-conducting sleeves 6 are hinged to each other, and a fine-tuning telescopic rod 57 is vertically connected to the middle of the guide rail bracket 55, and one end of the fine-tuning telescopic rod 57 is connected to the hinged ends of the two couplings 56 in the middle.

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

[0074] In this embodiment, a constant temperature water bath (not shown in the figure) is arranged outside the test chamber 2, and 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 thermal fluid, so that the thermal fluid can reach high temperature or low temperature, and the temperature range is -20°C to 200°C.

[0075] In this embodiment, a plurality of balls 65 are symmetrically distributed in the heat-conducting sleeve 6 , and each of the balls 65 rolls and contacts the surface of the high-voltage XLPE cable.

[0076] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electrical performance testing platform for high-voltage XLPE cable buffer layer, characterized in that: It includes: A testing machine (1) having a control host (11) installed therein, and a closed testing chamber (2) is provided on one side of the testing machine (1); Wire-hanging units (3) are arranged vertically and distributed on the test chamber (2), and a plurality of the wire-hanging units (3) hang the high-voltage XLPE cable horizontally in the test chamber (2); A power supply (12) is arranged outside the test 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 each high-voltage XLPE cable with a power supply voltage in a detection test; an output switch (13) is also installed on the transmission cable; the control host (11) is electrically connected to a relay switch of the power supply (12), so that the power supply (12) switch is controlled by the relay; A load simulation system is arranged in the test machine (1); the other end of each high-voltage XLPE cable is connected to the load simulation system; a voltage sensor is arranged in the test machine (1); the output signal end of the voltage sensor is connected to a data acquisition module of a control host (11) for monitoring and recording voltage changes during the test of the high-voltage XLPE cable; and a leakage protector (14) and an audible and visual alarm (15) are also connected to the outside of the control host (11); A variable temperature adjustment unit (4) is arranged in the test chamber (2), and the variable temperature adjustment unit (4) is used to adjust the temperature and humidity of the test environment of the high-voltage XLPE cable, thereby simulating different use environments; a plurality of high-voltage XLPE cables are in the same or different temperature and humidity conditions during the variable temperature adjustment of the variable temperature adjustment unit (4); The variable temperature adjustment unit (4) comprises: A sealed chamber (41) is arranged above the test chamber (2), wherein a plurality of spray pipes (42) arranged in parallel are arranged in the sealed chamber (41), and one end of each of the spray pipes (42) is connected to a water supply pipe; The spray heads (43) are evenly distributed on each of the spray pipes (42); a channel is provided below the sealing chamber (41); and the spray heads (43) are vertically connected to each of the channels; A back plate (44) is vertically fixed in the test chamber (2), wherein an electric heater is arranged inside the back plate (44) for assisting in regulating the internal temperature of the test chamber (2); A temperature and humidity sensor, arranged in the test chamber (2); The contact-type temperature control mechanism (5) is arranged in one-to-one correspondence with each high-voltage XLPE cable. The contact-type temperature control mechanism (5) is arranged horizontally in the test chamber (2). Each of the contact-type temperature control mechanisms (5) performs independent temperature control on the high-voltage XLPE cable.

2. The electrical performance testing platform for a high-voltage XLPE cable buffer layer according to claim 1, characterized in that: The wiring unit (3) comprises: Two wire tubes (31) are symmetrically arranged, each of the wire tubes (31) is horizontally fixed on two sides of the test chamber (2), and an inner rubber ring (32) is fixed on the outer wall of the test chamber (2) inside the wire tube (31); An outer rubber ring (33) is fixed on the inner wall of the test chamber (2) and is coaxially arranged on the wire tube (31); A sleeve (34) is co-centrically arranged on one end of each of the wire tubes (31) away from the inner rubber ring (32); a plurality of clamping plates (35) are distributed on the inner circumference of the sleeve (34); each of the clamping plates (35) is radially slidably arranged in the sleeve (34); A guide sleeve (36) is slidably sleeved on the sleeve (34); an extension portion (37) is fixed to one end surface of each clamping plate (35); a pressing block corresponding to the clamping plate (35) is fixed to the inner wall of the guide sleeve (36); the pressing block is in abutment with the extension portion (37) of the clamping plate (35), and the contact surface thereof is set to be an inclined structure; The electric telescopic rod (38) is installed above the sleeve (34) via a bracket, and a push rod (39) is hinged on the bracket. One end of the push rod (39) is connected to the electric telescopic rod (38), and the other end of the push rod (39) contacts the guide sleeve (36) as the electric telescopic rod (38) is adjusted in telescopic manner.

3. The electrical performance testing platform for a high-voltage XLPE cable buffer layer according to claim 2, characterized in that: A return spring is connected between each of the clamping plates (35) and the sleeve (34), and the clamping plates (35) slide in a direction away from the center of the sleeve (34) by the elastic force of the return spring when no external force is applied; a compression spring is also sleeved outside the sleeve (34), and one end of the compression spring is connected to the guide sleeve (36); The sleeve (34) is connected to the wire tube (31) in a sealed sliding manner, and a sealed ring cavity is formed at the connection point. A liquid channel (310) is provided in the sleeve (34), the liquid channel (310) is connected to the sealed ring cavity, and a hydraulic pipe is connected to the outside of the liquid channel (310).

4. The electrical performance testing platform for a high-voltage XLPE cable buffer layer according to claim 3 is characterized in that: After the hydraulic pipe has completed clamping the two ends of the high-voltage XLPE cable by the stringing unit (3), the internal hydraulic pressure of the sealing ring cavity is adjusted so that the stringing unit (3) pulls the two ends of the high-voltage XLPE cable in opposite directions or in opposite directions, so that the high-voltage XLPE cable is in a taut or relaxed state.

5. The electrical performance testing platform for a high-voltage XLPE cable buffer layer according to claim 1, characterized in that: The contact temperature control mechanism (5) comprises: A frame (51) is horizontally fixed in the test chamber (2), and a connecting rod (52) is slidably connected to the frame (51); A fixed plate (54) is fixed to one end of the connecting rod (52); a pneumatic pulse telescopic rod (53) is fixed in parallel to the frame (51); and a telescopic end of the pneumatic pulse telescopic rod (53) is connected to the fixed plate (54); A guide rail bracket (55) is arranged in parallel on one side of the connecting rod (52); a rotating connection portion is arranged on the fixing plate (54), and the guide rail bracket (55) is fixed to the rotating connection portion; The heat-conducting sleeves (6) are arranged in a plurality, the guide rail bracket (55) is slidably connected to a plurality of sliders, each of the heat-conducting sleeves (6) is fixed to a slider, the cross-section of the heat-conducting sleeve (6) is an inverted U-shaped structure, and each of the heat-conducting sleeves (6) is in sliding contact with the surface of the high-voltage XLPE cable.

6. The electrical performance testing platform for high-voltage XLPE cable buffer layer according to claim 5, characterized in that: A coupling frame (56) is hingedly connected to one end surface of one side of the heat-conducting sleeve (6), and the coupling frame (56) is arranged to be a foldable X-shaped structure. The coupling frames (56) on adjacent heat-conducting sleeves (6) are hingedly connected to each other. A fine-tuning telescopic rod (57) is vertically connected to the middle of the guide rail bracket (55), and one end of the fine-tuning telescopic rod (57) is connected to the hinged ends of two coupling frames (56) in the middle.

7. The electrical performance testing platform for high-voltage XLPE cable buffer layer according to claim 5, characterized in that: A heat-conducting layer (61) is provided inside the heat-conducting sleeve (6), a flow gap (62) is provided in the heat-conducting layer (61), the flow gap (62) is distributed in an S shape, and a liquid inlet pipeline (63) and a liquid discharge pipeline (64) are connected to the heat-conducting sleeve (6), the liquid inlet pipeline (63) and the liquid discharge pipeline (64) are respectively connected to two ends of the flow gap (62).

8. The electrical performance testing platform for high-voltage XLPE cable buffer layer according to claim 7, characterized in that: A constant temperature water bath is arranged 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; and a refrigeration unit and a heating unit are installed outside the constant temperature water bath.

9. The electrical performance testing platform for high-voltage XLPE cable buffer layer according to claim 7, characterized in that: A plurality of balls (65) are symmetrically distributed in the heat-conducting sleeve (6), and each of the balls (65) rolls and contacts the surface of the high-voltage XLPE cable.

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