Load for power line information leakage prevention test

Abstract

The invention relates to the technical field of power lines, in particular to a power line information leakage prevention test load which comprises a box body, the interior of the box body is hollow, a radiator is arranged on one face of the box body, and a partition plate is arranged in the box body; the collector is arranged in the box body and located on one side of the partition plate; the controller is arranged on one side of the box body, and one side of the controller is provided with an impedance test port; the load is arranged in the box body, and an input connector is arranged on one side of the transmission block; and the radial grading variable resistance assembly is arranged in the load, and the radial grading variable resistance assembly comprises an adjusting module and a variable resistance module. Compared with the prior art, by arranging the variable resistance module and the step-by-step buffer crimping mechanism, the thermal load is effectively dispersed, the problems of rough load adjustment and response lag in the prior art are solved, and the working condition coverage and the data accuracy of the leakage test are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power lines, and in particular to a load for power line information leakage prevention testing. Background Art

[0002] Currently, with the rapid development of modern technology and the diversification of communication methods, a device specifically designed to transmit information via power lines has emerged. The powerline modem modulates network signals onto electrical wires, utilizing existing wiring to solve network wiring problems. Electromagnetic leakage is an increasingly serious problem. Electromagnetic leakage refers to electromagnetic leakage caused by the transmission of electromagnetic signals from an information system through ground, power, and signal lines during operation. These electromagnetic signals, if received and processed, can be used to recover the original information, resulting in information leaks. Powerline modems are also a device that can potentially cause information leaks. Information leakage prevention devices are now available on the market. Most of these devices are 250V / 10A isolated power supplies. To test these power supplies, it is necessary to apply a resistive load to them to verify whether the filter within the power supply can effectively block the load.

[0003] In the prior art, a Chinese patent document with publication number CN112505376B proposes a load for testing power line information leakage prevention. The load adopts a resistor wound in both positive and negative directions, so that the positive and negative magnetic fields cancel each other out after power is applied, effectively solving the problem of large high-frequency inductance impedance. The signal impedance of the injected frequency 150k~400MHz is 50 ohms, providing impedance matching for the injected signal source. However, the test load adopts a single fixed resistance value and cannot dynamically adjust the resistance value according to the actual working conditions of the device under test (such as different voltages and power levels). This results in a narrow test coverage range and makes it difficult to simulate the complex load changes in the real power grid, affecting the comprehensiveness of leakage signal detection. In addition, during long-term high-current testing, thermal deformation of the metal material will cause the contact resistance to increase significantly, destroying the resistance stability and affecting the repeatability of the test results. Therefore, the present application discloses a load for testing power line information leakage prevention. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to propose a load for power line anti-information leakage testing to solve the problem that traditional test loads use fixed resistance values ​​and lack a temperature drift compensation mechanism, resulting in the inability to dynamically adapt to different working conditions, and the resistance value becomes unstable under high temperature and high current, affecting the coverage of leakage testing and the reliability of the results.

[0005] Based on the above purpose, the present invention provides a load for power line information leakage prevention testing, comprising a box body, the interior of the box body is hollow, a radiator is provided on one side of the box body, and a partition is provided inside the box body; A collector, the collector being arranged inside the box and located on one side of the partition; A controller, the controller being disposed on one side of the box, the controller being provided with an impedance test port on one side of the controller, the controller being electrically connected to the collector, and the controller being provided with a control switch on one side of the controller; A load, the load being disposed inside the box and located on the other side of the partition, a transmission block being disposed on one side of the load, an input connector being disposed on one side of the transmission block, an outer surface of the transmission block being made of an insulating material, and a plurality of capacitors being disposed inside the transmission block; A radially graded variable resistance component is provided inside the load, and comprises an adjustment module and a variable resistance module, wherein the adjustment module is used to adjust the resistance value of the variable resistance module.

[0006] Preferably, the variable resistance module includes a fixed rod fixedly installed in the middle part of the load, and rotating gears are rotatably installed at both ends of the fixed rod, and a plurality of driving slots are provided on the rotating gear. A plurality of fixed resistors are fixedly installed on the side of the load close to the rotating gear, and a plurality of fixed resistors are provided with a slide groove, and a movable resistor is slidably installed inside the slide groove, and a slider is provided on one side of the movable resistor, and the slider is slidably installed inside the driving slot, and a first connecting block is provided on the side of the movable resistor away from the rotating gear, a second connecting block is provided at the other end of the first connecting block, and a compression resistor is provided on one side of the second connecting block.

[0007] Preferably, the driving groove is configured to be in an arc shape, and a plurality of the driving grooves are distributed in a circumferential shape on the rotating gear.

[0008] Preferably, fixed plates are provided on both sides of the fixed rod, and a plurality of sliding grooves are opened on the fixed plates, and the plurality of sliding grooves respectively correspond to the plurality of movable resistors, and the interior of the sliding grooves are slidably installed with the first-stage additional resistor, the second-stage additional resistor, and the third-stage additional resistor from the outside to the inside in sequence, and both ends of the first-stage additional resistor, both ends of the second-stage additional resistor, and both ends of the third-stage additional resistor are provided with sliding blocks that slide inside the sliding grooves, and a reset spring is provided between two adjacent sliding blocks.

[0009] Preferably, the fixed disk, the sliding block and the return spring are all insulated.

[0010] Preferably, the top surface of the compression resistor, the top surface of the first-level additional resistor, the top surface of the second-level additional resistor, and the top surface of the third-level additional resistor are all set to be arc concave shapes, and the top surface of the compression resistor, the top surface of the first-level additional resistor, the top surface of the second-level additional resistor, and the bottom surface of the third-level additional resistor are all set to be arc convex shapes, and the arc convex shape is adapted to the arc concave shape.

[0011] Preferably, the concave arc-shaped side of the compression resistor, the first-level additional resistor, the second-level additional resistor, and the third-level additional resistor is provided with a shrinkage layer, and the convex arc-shaped side of the compression resistor, the first-level additional resistor, the second-level additional resistor, and the third-level additional resistor is provided with an expansion layer. When the internal temperature of the compression resistor, the first-level additional resistor, the second-level additional resistor, and the third-level additional resistor is higher than eighty degrees, the expansion layer expands to bulge and squeeze the shrinkage layer to compensate for the temperature drift of the contact resistance.

[0012] Preferably, the resistance range of the first-level additional resistor is 22±0.5Ω, and the material is Ni80Cr20 alloy foil; the resistance range of the second-level additional resistor is 100±2Ω, and the material is FeCrAlY high-temperature alloy; the resistance range of the third-level additional resistor is 440±5Ω, and the material is RuO2-SiO2 thick film resistor.

[0013] Preferably, the adjustment module includes an extension plate fixedly mounted on one side of one of the fixed resistors, a meshing gear is rotatably mounted on the extension plate, the meshing gear is engaged with the rotating gear, a driving rod is provided on one side of the meshing gear, the driving rod passes through the load setting, and an adjustment wheel is provided at the other end of the driving rod.

[0014] Preferably, the fixing rod, the rotating gear, the extension plate, the meshing gear, the driving rod, and the adjusting wheel are all made of insulating materials.

[0015] Beneficial effects of the present invention: 1. This power line anti-information leakage test load features a variable resistance module and a gear-driven, multi-stage sliding resistor structure, achieving precise adjustability and dynamic response. It utilizes three levels of gradient resistor crimping, coupled with arc-shaped drive slots and a spring return system, to precisely control the connection state of each resistor level, allowing for a wide resistance adjustment range. The graded material selection of Ni80Cr20 alloy foil, FeCrAlY high-temperature alloy, and RuO2-SiO2 thick-film resistors balances low-temperature drift, high-heat resistance, and high-frequency stability. The concave-convex contact surface and insulating sliding assembly ensure reliable contact while achieving electrical isolation. The step-by-step buffer crimping mechanism effectively distributes thermal loads, resolving the issues of rough adjustment and delayed response associated with traditional loads, significantly improving the operating condition coverage and data accuracy of leakage tests.

[0016] 2. This load for power line information leakage prevention testing is equipped with a compression layer and an expansion layer. Through the combination of thermal expansion material and low expansion material, it automatically increases the contact pressure when the temperature exceeds 80°C, so that the contact area of ​​the protrusion penetrating the groove is expanded to twice the initial area, effectively compensating for the problem of increased contact resistance caused by high temperature. The passive response mechanism of the expansion layer can maintain stable contact resistance under high temperature conditions without external control, suppressing poor contact caused by thermal deformation of the metal, and ensuring the consistency of the load resistance value in long-term high-current testing.

[0017] 3. This type of load for power line information leakage prevention testing is equipped with an adjustment module. By continuously adjusting the wheel rotation angle, it can achieve continuous or graded adjustment of the resistance value change. The adjustment process does not require unpacking or powering off, ensuring the real-time and safety of the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention from a first viewing angle; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention from a second viewing angle; Figure 3 Schematic diagram of the load structure of the present invention; Figure 4 Schematic diagram of the internal structure of the load of the present invention; Figure 5 This is a schematic diagram of the structure of a radial graded variable resistance component of the present invention; Figure 6 This is a schematic diagram of the partial structure of the radial graded variable resistance component of the present invention; Figure 7 This is a schematic diagram of the partial structure of the resistance module of the present invention; Figure 8 For the present invention Figure 7 A in the middle is an enlarged structural diagram; Figure 9 This is a schematic diagram of the resistor structure added in the present invention.

[0020] The following are marked in the figure: 1. Box; 2. Radiator; 3. Controller; 4. Impedance test port; 5. Collector; 6. Control switch; 7. Input connector; 8. Transmission block; 9. Load; 10. Fixed rod; 11. Fixed resistor; 12. Slide slot; 13. Rotating gear; 14. Drive slot; 15. Movable resistor; 16. Slider; 17. First connecting block; 18. Second connecting block; 19. Compression resistor; 20. Extension plate; 21. Meshing gear; 23. Drive rod; 24. Adjustment wheel; 25. Fixed disk; 26. Slide slot; 27. First-stage additional resistor; 28. Second-stage additional resistor; 29. ​​Third-stage additional resistor; 30. Sliding block; 31. Return spring; 32. Expansion layer; 33. Contraction layer. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] like Figures 1 to 9 As shown, a load for power line information leakage prevention test includes a box body 1, the interior of the box body 1 is hollow, a radiator 2 is provided on one side of the box body 1, and a partition is provided inside the box body 1; a collector 5, the collector 5 is arranged inside the box body 1 and is located on one side of the partition; a controller 3, the controller 3 is arranged on one side of the box body 1, an impedance test port 4 is provided on one side of the controller 3, the controller 3 is electrically connected to the collector 5, and a control switch 6 is provided on one side of the controller 3; a load 9, the load 9 is arranged inside the box body 1 and is located on the other side of the partition, a transmission block 8 is provided on one side of the load 9, an input connector 7 is provided on one side of the transmission block 8, the outer surface of the transmission block 8 is made of insulating material, and a plurality of capacitors are provided inside the transmission block 8; a radial graded variable resistance component, the radial graded variable resistance component is arranged inside the load 9, the radial graded variable resistance component includes an adjustment module and a variable resistance module, and the adjustment module is used to adjust the resistance value of the variable resistance module; During the test, the tester connects the power line signal under test to the transmission block 8 via the input connector 7. The signal first enters the transmission block 8, which is equipped with several capacitors, and is then directed to the load 9 for processing. The load 9 is integrated with a radially graded variable resistance component. The adjustment module controls the resistance of the variable resistance module, making the load 9 adjustable. This allows the user to adjust the resistance of the load 9 according to different needs during the test, simulating different leakage conditions or impedance matching conditions. The heat generated during the operation of the load 9 is quickly dissipated through the heat sink 2, ensuring the safe and stable operation of the equipment. At the same time, the collector 5 on the other side of the partition collects the response signal of the load 9 and transmits the data to the controller 3. The controller 3 determines the signal characteristics based on the preset logic and outputs the test results through the impedance test port 4 for collection or recording by the host computer. During the process, if the test mode needs to be switched or manually started and stopped, it can be controlled by the control switch 6. Ultimately, the entire device realizes the integrated test of signal simulation, load 9 adjustment, data collection and output. In particular, to address the problem of load 9 being unable to adjust in traditional reference documents, this structure effectively realizes fine adjustment of multiple resistance levels through the coordinated control of the adjustment module and the variable resistance module, greatly improving the test accuracy and applicability.

[0024] like Figures 3 to 9As shown, the variable resistance module includes a fixed rod 10 fixedly installed in the middle of the load 9, and a rotating gear 13 is rotatably installed at both ends of the fixed rod 10. A plurality of driving grooves 14 are provided on the rotating gear 13. A plurality of fixed resistors 11 are fixedly installed on the side of the load 9 close to the rotating gear 13. A slide groove 12 is provided on each of the fixed resistors 11. A movable resistor 15 is slidably installed inside the slide groove 12. A slider 16 is provided on one side of the movable resistor 15. The slider 16 is slidably installed inside the driving groove 14. A first connecting block 17 is provided on the side of the movable resistor 15 away from the rotating gear 13. A second connecting block 18 is provided at the other end of the first connecting block 17. A compression resistor 19 is provided on one side of the second connecting block 18. The driving groove 14 is arranged in an arc shape. The plurality of driving grooves 14 are distributed circumferentially on the rotating gear 13. Fixed disks 25 are provided on both sides of the fixed rod 10. A plurality of sliding grooves 26 are provided, and the plurality of sliding grooves 26 correspond to the plurality of movable resistors 15 respectively. The first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29 are slidably installed in sequence from the outside to the inside of the sliding grooves 26. Both ends of the first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29 are provided with sliding blocks 30 that slide in the sliding grooves 26, and a return spring 31 is provided between two adjacent sliding blocks 30. The top surface of the compression resistor 19, the top surface of the first-stage additional resistor 27, the top surface of the second-stage additional resistor 28, and the top surface of the third-stage additional resistor 29 are all set to a circular arc concave shape, and the top surface of the compression resistor 19, the top surface of the first-stage additional resistor 27, the top surface of the second-stage additional resistor 28, and the bottom surface of the third-stage additional resistor 29 are all set to a circular arc convex shape, and the circular arc convex shape is adapted to the circular arc concave shape; During the actual test process, the operator drives the control module to drive the rotating gear 13 to rotate slowly, and the several arc-shaped driving grooves 14 on the rotating gear 13 rotate accordingly, and drive the slider 16 embedded therein to move along the preset arc trajectory. The slider 16 pushes the movable resistor 15 connected to it to slide forward in the corresponding slide groove 12. The front end of the movable resistor 15 is connected to a compression resistor 19. When it advances to a certain position, the compression resistor 19 gradually contacts the top arc concave surface of the first-stage additional resistor 27 located inside the sliding groove 26. Due to the increase in the compression force, the resistor moves downward under the drive of the sliding block 30 to form a connection with the main circuit of the system, and the overall resistance of the circuit increases; if the gear continues to rotate, the compression resistor 19 will press the first-stage additional resistor 27 to the upper surface of the sliding groove 26. The device is inserted into the limit position and continues to move forward to squeeze the second-stage additional resistor 28 and then the third-stage resistor. During each stage of the pressing process, the sliding block 30 and the reset spring 31 structure are coordinated to achieve flexible buffering and reversible operation. After the operation is completed, if the gear is rotated in the opposite direction, the pressing resistor 19 is gradually retracted, and the additional resistor is reset step by step out of the circuit under the action of the reset spring 31, thereby reducing the resistance value. The entire process can accurately control whether each level of resistance participates in the conduction, thereby dynamically adjusting the resistance value of the overall load 9, realizing flexible control of the impedance under different working conditions in the simulated leakage test, effectively solving the problems of the traditional load 9 being unadjustable, low in adjustment accuracy or delayed response, and improving the adaptability, accuracy and engineering practicality of the power line information security test. The first-stage additional resistor 27 has a resistance range of 22±0.5Ω and is made of Ni80Cr20 alloy foil; the second-stage additional resistor 28 has a resistance range of 100±2Ω and is made of FeCrAlY high-temperature alloy; the third-stage additional resistor 29 has a resistance range of 440±5Ω and is made of RuO2-SiO2 thick film resistor; The three-level resistors are designed at 22±0.5Ω, 100±2Ω, and 440±5Ω, respectively, covering a wide resistance range from small to large, meeting the simulation needs of scenarios ranging from low loads9 to high impedance leakage. Each level offers high precision adaptability, facilitating simulation of high-precision scenarios and progressive testing. The first-level Ni80Cr20 alloy foil resistors offer low temperature drift and oxidation resistance, making them suitable for low-resistance precision applications with fast response and high linearity. The second-level FeCrAlY high-temperature alloy resistors exhibit excellent heat resistance and can withstand high current thermal loads, making them suitable for medium- to high-power environments. The third-level RuO2-SiO2 thick-film resistors offer excellent high-frequency performance and long-term stability, making them suitable for simulating complex loads9 and noise leakage conditions. The multiple-level resistors are designed separately and are gradually pressed in using active resistors15, effectively distributing the heat load and avoiding single-point overheating caused by concentrated heat, thereby improving the system's reliable operation time and response sensitivity. The compression resistor 19, the first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29 have a concave arc-shaped surface provided with a contraction layer 33, and the compression resistor 19, the first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29 have a convex arc-shaped surface provided with an expansion layer 32. When the internal temperature of the compression resistor 19, the first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29 is higher than 80 degrees, the expansion layer 32 expands to bulge and squeeze the contraction layer 33, thereby compensating for the temperature drift of the contact resistance; The expansion layer 32 is made of copper-tungsten alloy, which has a high thermal expansion coefficient (8.5×10⁻ 6 / ℃) can expand significantly when the temperature exceeds 80℃; the shrinkage layer 33 is made of Invar 36, which has an ultra-low thermal expansion coefficient (1.6×10⁻ 6 / °C) can suppress thermal deformation. When the temperature rises, the copper-tungsten alloy expansion layer 32 actively expands outward, pushing the protrusion structure deep into the groove of the invar alloy contraction layer 33, increasing the contact area to more than twice the initial area. This passive temperature control mechanism can offset the contact resistance drift caused by high temperature without the need for external energy. The material combination is also arc-resistant and anti-oxidation, suitable for long-term high-current operation, significantly improving the measurement consistency of the test equipment under extreme temperatures, further enhancing test accuracy and reliability. The entire process not only enables flexible switching of load 9 combinations according to demand, but also ensures high-performance operation in harsh thermal environments. It can effectively compensate for problems such as metal material expansion and resistance changes caused by high temperature, maintain the stability of electrical contact and the constancy of load 9 resistance, and improve the measurement accuracy and response consistency of the entire load 9 equipment under long-term high-temperature operating conditions.

[0025] like Figures 2 to 6 As shown, the adjustment module includes an extension plate 20 fixedly mounted on one side of one of the fixed resistors 11, a meshing gear 21 is rotatably mounted on the extension plate 20, the meshing gear 21 meshes with the rotating gear 13, a driving rod 23 is provided on one side of the meshing gear 21, the driving rod 23 passes through the load 9, and an adjustment wheel 24 is provided on the other end of the driving rod 23. The fixed rod 10, the rotating gear 13, the extension plate 20, the meshing gear 21, the driving rod 23, and the adjustment wheel 24 are all made of insulating materials; When the equipment is running, the operator rotates the adjusting wheel 24 manually or by adding an external motor according to the test requirements. The adjusting wheel 24 transmits the rotational force to the meshing gear 21 through its integrally formed drive rod 23. The meshing gear 21 is engaged with the rotating gear 13 fixedly mounted on the extension plate 20. As the meshing gear 21 rotates, the rotating gear 13 also rotates synchronously, driving the compression resistor 19 to move along a predetermined trajectory in the internal structure. When the compression resistor 19 is pushed into a deeper position, its contact area with the conductive contact point increases or further compresses the contact elastic layer, thereby changing the effective resistance of the load 9 circuit. The operator can achieve continuous or graded adjustment of the resistance change by continuously adjusting the rotation angle of the wheel 24. The adjustment process does not require unpacking or power off, ensuring the real-time and safety of the test process. Since all structural parts involved in the adjustment action are made of insulating materials, the conductive risk is effectively isolated.

[0026] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0027] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A load for power line information leakage prevention testing, characterized in that: include: A box body (1), wherein the interior of the box body (1) is hollow, a radiator (2) is provided on one side of the box body (1), and a partition is provided inside the box body (1); A collector (5), the collector (5) being arranged inside the box (1) and located on one side of the partition; A controller (3), the controller (3) being arranged on one side of the box (1), an impedance test port (4) being arranged on one side of the controller (3), the controller (3) being electrically connected to the collector (5), and a control switch (6) being arranged on one side of the controller (3); A load (9), the load (9) being arranged inside the box (1) and located on the other side of the partition, a transmission block (8) being arranged on one side of the load (9), an input connector (7) being arranged on one side of the transmission block (8), an outer surface of the transmission block (8) being made of an insulating material, and a plurality of capacitors being arranged inside the transmission block (8); A radially graded variable resistance component is provided inside the load (9), and comprises an adjustment module and a variable resistance module, wherein the adjustment module is used to adjust the resistance value of the variable resistance module.

2. The power line information leakage prevention test load according to claim 1, characterized in that: The variable resistance module includes a fixed rod (10) fixedly mounted in the middle of the load (9), a rotating gear (13) is rotatably mounted on both ends of the fixed rod (10), and a plurality of driving slots (14) are provided on the rotating gear (13). A plurality of fixed resistors (11) are fixedly mounted on a side of the load (9) close to the rotating gear (13), and a plurality of fixed resistors (11) are provided with a sliding slot (12). A movable resistor (15) is slidably mounted inside the sliding slot (12), and a slider (16) is provided on one side of the movable resistor (15). The slider (16) is slidably mounted inside the driving slot (14). A first connecting block (17) is provided on the side of the movable resistor (15) away from the rotating gear (13), a second connecting block (18) is provided at the other end of the first connecting block (17), and a compression resistor (19) is provided on one side of the second connecting block (18).

3. The load for power line information leakage prevention test according to claim 2, characterized in that: The driving groove (14) is configured to be in an arc shape, and a plurality of the driving grooves (14) are distributed in a circumferential shape on the rotating gear (13).

4. The load for power line information leakage prevention test according to claim 3, characterized in that: A fixed disk (25) is provided on both sides of the fixed rod (10), and a plurality of sliding grooves (26) are provided on the fixed disk (25), and the plurality of sliding grooves (26) respectively correspond to the plurality of movable resistors (15). The interior of the sliding grooves (26) is slidably installed with a first-stage additional resistor (27), a second-stage additional resistor (28), and a third-stage additional resistor (29) from the outside to the inside. Both ends of the first-stage additional resistor (27), the second-stage additional resistor (28), and the third-stage additional resistor (29) are provided with sliding blocks (30) that slide inside the sliding grooves (26), and a return spring (31) is provided between two adjacent sliding blocks (30).

5. The load for power line information leakage prevention test according to claim 4, characterized in that: The fixed disk (25), the sliding block (30) and the return spring (31) are all insulated.

6. The load for power line information leakage prevention test according to claim 5, characterized in that: The top surface of the compression resistor (19), the top surface of the first-stage additional resistor (27), the top surface of the second-stage additional resistor (28), and the top surface of the third-stage additional resistor (29) are all arranged in a circular arc concave shape, and the top surface of the compression resistor (19), the top surface of the first-stage additional resistor (27), the top surface of the second-stage additional resistor (28), and the bottom surface of the third-stage additional resistor (29) are all arranged in a circular arc convex shape, and the circular arc convex shape is adapted to the circular arc concave shape.

7. The load for power line information leakage prevention test according to claim 6, characterized in that: The compression resistor (19), the first-stage additional resistor (27), the second-stage additional resistor (28), and the third-stage additional resistor (29) are provided with a shrinkage layer (33) on one side of the arc concave shape, and the compression resistor (19), the first-stage additional resistor (27), the second-stage additional resistor (28), and the third-stage additional resistor (29) are provided with an expansion layer (32) on one side of the arc convex shape. When the internal temperature of the compression resistor (19), the first-stage additional resistor (27), the second-stage additional resistor (28), and the third-stage additional resistor (29) is higher than 80 degrees, the expansion layer (32) expands to bulge and squeeze the shrinkage layer (33), thereby compensating for the contact resistance temperature drift.

8. The load for power line information leakage prevention test according to claim 7, characterized in that: The first-stage additional resistor (27) has a resistance range of 22±0.5Ω and is made of Ni80Cr20 alloy foil; the second-stage additional resistor (28) has a resistance range of 100±2Ω and is made of FeCrAlY high-temperature alloy; the third-stage additional resistor (29) has a resistance range of 440±5Ω and is made of RuO2-SiO2 thick film resistor.

9. The load for power line information leakage prevention test according to claim 8, characterized in that: The adjustment module comprises an extension plate (20) fixedly mounted on one side of one of the fixed resistors (11); a meshing gear (21) is rotatably mounted on the extension plate (20); the meshing gear (21) is meshed with the rotating gear (13); a driving rod (23) is provided on one side of the meshing gear (21); the driving rod (23) passes through the load (9); and an adjustment wheel (24) is provided at the other end of the driving rod (23).

10. The load for power line information leakage prevention test according to claim 9, characterized in that: The fixing rod (10), the rotating gear (13), the extension plate (20), the meshing gear (21), the driving rod (23), and the regulating wheel (24) are all made of insulating materials.

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