A load for power line information leakage test

Abstract

The present application relates to the technical field of power line, and particularly relates to a load for power line information leakage prevention test, which comprises a box body, the inside of the box body is hollow, one side of the box body is provided with a radiator, and the inside of the box body is provided with a partition plate; a collector is arranged in the inside of the box body and located at one side of the partition plate; a controller is arranged at one side of the box body, and one side of the controller is provided with an impedance test port; a load is arranged in the inside of the box body, and one side of a transmission block is provided with an input connector; a radial staged variable resistance assembly is arranged in the inside of the load, and the radial staged variable resistance assembly comprises an adjusting module and a variable resistance module. Compared with the prior art, the variable resistance module is arranged, the step-by-step buffer crimping mechanism effectively disperses the heat load, the problem of rough adjustment and response lag of the traditional load is solved, and the working condition coverage and data accuracy of the leakage test are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of power line technology, and in particular to a load for testing power line information leakage prevention. Background Technology

[0002] Currently, with the rapid development of modern technology and the diversification of communication methods, a device specifically designed to transmit information over power lines is called a powerline adapter. A powerline adapter modulates network signals onto power lines, utilizing existing wiring to solve network cabling problems. Nowadays, electromagnetic leakage is becoming increasingly serious. Electromagnetic leakage refers to the conduction and emission of electromagnetic signals through ground wires, power lines, and signal lines during equipment operation. If these electromagnetic signals are received and processed, the original information can be recovered, leading to information leakage. Powerline adapters are also a potential source of information leakage. Devices designed to prevent information leakage have appeared on the market. Most of these devices use 250V / 10A isolated power supplies. Testing these power supplies requires applying a resistive load to verify whether the internal filter can effectively block leakage under load.

[0003] In the prior art, Chinese patent document CN112505376B, "A Load for Testing Power Line Information Leakage Prevention," proposes a load that effectively solves the problem of high high-frequency inductor impedance by using a bidirectionally wound resistor, which cancels out the positive and negative magnetic fields after energization. The impedance of the injected signal at frequencies of 150k to 400MHz is 50 ohms, providing impedance matching for the injected signal source. However, this test load uses a single fixed resistance value and cannot dynamically adjust the resistance value according to the actual operating conditions of the device under test (such as different voltages and power levels). This results in a narrow test coverage, making it difficult to simulate the complex load changes in a real power grid, affecting the comprehensiveness of leakage signal detection. Furthermore, during long-term high-current testing, thermal deformation of the metal material can cause a significant increase in contact resistance, destroying the stability of the resistance value and affecting the repeatability of the test results. Therefore, this application discloses a load for testing power line information leakage prevention. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose a load for power line information leakage testing, so as to solve the problem that traditional test loads, due to their fixed resistance value and lack of temperature drift compensation mechanism, cannot dynamically adapt to different operating conditions, and their resistance value becomes unstable under high temperature and high current, affecting the coverage and reliability of leakage testing results.

[0005] To achieve the above objectives, the present invention provides a load for testing power line information leakage prevention, including a housing, wherein the interior of the housing is hollow, a heat sink is provided on one side of the housing, and a partition is provided inside the housing;

[0006] A collector is disposed inside the housing and located on one side of the partition;

[0007] The controller is located on one side of the enclosure, and an impedance test port is provided on one side of the controller. The controller is electrically connected to the collector, and a control switch is provided on one side of the controller.

[0008] The load is located inside the housing and on the other side of the partition. A transmission block is provided on one side of the load, and an input connector is provided on one side of the transmission block. The outer surface of the transmission block is made of insulating material, and several capacitors are provided inside the transmission block.

[0009] A radially graded variable resistance assembly is disposed inside the load. The radially graded variable resistance assembly includes an adjustment module and a variable resistance module. The adjustment module is used to adjust the resistance value of the variable resistance module.

[0010] Preferably, the variable resistance module includes a fixed rod fixedly installed in the middle of the load. Rotary gears are rotatably mounted at both ends of the fixed rod. Several drive slots are formed on the rotary gears. Several fixed resistors are fixedly installed on the side of the load closest to the rotary gears. Each fixed resistor has a sliding groove. A movable resistor is slidably installed inside the sliding groove. A slider is provided on one side of the movable resistor and is slidably installed inside the drive slot. A first connecting block is provided on the side of the movable resistor away from the rotary gears. A second connecting block is provided at the other end of the first connecting block. A compression resistor is provided on one side of the second connecting block.

[0011] Preferably, the drive groove is configured as an arc shape, and a plurality of the drive grooves are distributed circumferentially on the rotating gear.

[0012] Preferably, a fixing plate is provided on both sides of the fixing rod, and a plurality of sliding grooves are provided on the fixing plate. The plurality of sliding grooves correspond to a plurality of movable resistors. A first-stage additional resistor, a second-stage additional resistor, and a third-stage additional resistor are slidably installed in the sliding grooves from the outside to the inside. Sliding blocks that slide inside the sliding grooves are provided at both ends of the first-stage additional resistor, the two ends of the second-stage additional resistor, and the two ends of the third-stage additional resistor. A return spring is provided between each pair of adjacent sliding blocks.

[0013] Preferably, the fixed disk, the sliding block, and the return spring are all insulated.

[0014] Preferably, the top surface of the compression resistor, the top surface of the first-stage additional resistor, the top surface of the second-stage additional resistor, and the top surface of the third-stage additional resistor are all set in a concave arc shape, and the bottom surface of the compression resistor, the top surface of the first-stage additional resistor, the top surface of the second-stage additional resistor, and the bottom surface of the third-stage additional resistor are all set in a convex arc shape, and the convex arc shape matches the concave arc shape.

[0015] Preferably, the concave side of the compression resistor, the first-stage additional resistor, the second-stage additional resistor, and the third-stage additional resistor are provided with a shrinkage layer, and the convex side of the compression resistor, the first-stage additional resistor, the second-stage additional resistor, and the third-stage additional resistor are provided with an expansion layer. When the internal temperature of the compression resistor, the first-stage additional resistor, the second-stage additional resistor, and the third-stage additional resistor is higher than 80 degrees Celsius, the expansion layer expands and can bulge and squeeze the shrinkage layer to compensate for the temperature drift of the contact resistance.

[0016] Preferably, the first-stage additional resistor has a resistance value range of 22±0.5Ω and is made of Ni80Cr20 alloy foil; the second-stage additional resistor has a resistance value range of 100±2Ω and is made of FeCrAlY high-temperature alloy; and the third-stage additional resistor has a resistance value range of 440±5Ω and is made of RuO2-SiO2 thick film resistor.

[0017] Preferably, the adjustment module includes an extension plate fixedly installed on one side of one of the fixed resistors, a meshing gear rotatably mounted on the extension plate, the meshing gear meshing with the rotating gear, a drive rod provided on one side of the meshing gear, the drive rod passing through the load setting, and an adjustment wheel provided at the other end of the drive rod.

[0018] Preferably, the fixed rod, rotating gear, extension plate, meshing gear, drive rod, and adjusting wheel are all made of insulating material.

[0019] The beneficial effects of this invention are:

[0020] 1. This type of power line information leakage testing load, through the incorporation of a variable resistance module and a gear-driven multi-stage sliding resistor structure, achieves precise adjustment and dynamic response of the power line test load. It employs a three-stage gradient resistor press-fit, coupled with an arc-shaped drive groove and spring reset system, to accurately control the connection state of each resistor stage. The resistance adjustment range is wide. The graded material selection, using 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 components ensure reliable contact while achieving electrical isolation. The step-by-step buffer press-fit mechanism effectively disperses the heat load, solving the problems of coarse adjustment and lag response in traditional loads, significantly improving the coverage and data accuracy of leakage testing.

[0021] 2. This type of load for power line information leakage prevention testing, by setting up a compression layer and an expansion layer, through the combination of thermal expansion material and low expansion material, automatically increases the contact pressure when the temperature exceeds 80°C, so that the contact area of ​​the protrusion into the groove is expanded to twice the initial size, effectively compensating for the problem of increased contact resistance caused by high temperature. The passive response mechanism of the expansion layer does not require external control, and can maintain a stable contact resistance under high temperature conditions, suppress poor contact caused by metal thermal deformation, and ensure the consistency of load resistance value in long-term high-current testing.

[0022] 3. This type of load for power line information leakage prevention testing is equipped with an adjustment module. By continuously adjusting the rotation angle of the wheel, the resistance value can be continuously or gradually adjusted. The adjustment process does not require opening the box or disconnecting the power, ensuring the real-time performance and safety of the testing process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a first-view three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the second-view three-dimensional structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the load structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the internal structure of the load in this invention;

[0028] Figure 5 This is a schematic diagram of the radial graded variable resistance component structure of the present invention;

[0029] Figure 6 This is a partial structural diagram of the radial graded variable resistance assembly of the present invention;

[0030] Figure 7 This is a partial structural diagram of the variable resistance module of the present invention;

[0031] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle;

[0032] Figure 9 A schematic diagram showing the addition of a resistor structure to this invention.

[0033] The diagram is marked as follows:

[0034] 1. Housing; 2. Heat sink; 3. Controller; 4. Impedance test port; 5. Collector; 6. Control switch; 7. Input connector; 8. Transmission block; 9. Load; 10. Fixing rod; 11. Fixed resistor; 12. Slide groove; 13. Rotating gear; 14. Drive groove; 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. Adjusting wheel; 25. Fixing plate; 26. Slide groove; 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 Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0036] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] like Figures 1 to 9As shown, the load for power line information leakage prevention testing includes a housing 1, the interior of which is hollow, a heat sink 2 on one side of the housing 1, and a partition inside the housing 1; a collector 5, which is located inside the housing 1 and on one side of the partition; a controller 3, which is located on one side of the housing 1, with an impedance test port 4 on one side of the controller 3, electrically connected to the collector 5, and a control switch 6 on one side of the controller 3; a load 9, which is located inside the housing 1 and on the other side of the partition, with a transmission block 8 on one side of the load 9, an input connector 7 on one side of the transmission block 8, the outer surface of the transmission block 8 being made of insulating material, and several capacitors inside the transmission block 8; and a radial graded variable resistor assembly, which is located inside the load 9, and includes an adjustment module and a variable resistor module, the adjustment module being used to adjust the resistance value of the variable resistor module;

[0038] During testing, the tester connects the power line signal to be tested to the transmission block 8 via the input connector 7. The signal first enters the transmission block 8, which contains several capacitors, and is then fed into the load 9 for processing. The load 9 integrates a radial graded variable resistor assembly. The adjustment module controls the resistance value of the variable resistor module, making the load 9 adjustable. This allows the user to adjust the resistance of the load 9 according to different needs during testing, simulating different leakage conditions or impedance matching conditions. The heat generated by the load 9 during operation is quickly dissipated through the heat sink 2, ensuring the safe and stable operation of the equipment. At the same time, the collector 5 located 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 judges the signal characteristics according to preset logic and outputs the test results through the impedance test port 4 for the host computer to collect or record. During the process, if it is necessary to switch the test mode or manually start and stop, it can be operated through the control switch 6. Finally, the equipment as a whole realizes integrated testing of signal simulation, load 9 adjustment, data acquisition and output. Especially for the problem that the load 9 cannot be adjusted in traditional comparison files, this structure effectively realizes fine adjustment of multiple resistance levels through the coordinated control of the adjustment module and the variable resistor module, greatly improving the test accuracy and applicability.

[0039] like Figures 3 to 9As shown, the variable resistance module includes a fixed rod 10 fixedly installed in the middle of the load 9. Rotating gears 13 are rotatably mounted at both ends of the fixed rod 10. Several drive slots 14 are formed on the rotating gears 13. Several fixed resistors 11 are fixedly installed on the side of the load 9 closest to the rotating gears 13. Each fixed resistor 11 has a sliding groove 12. A movable resistor 15 is slidably installed inside the sliding groove 12. A slider 16 is provided on one side of the movable resistor 15 and is slidably installed inside the drive slot 14. A first connecting block 17 is provided on the side of the movable resistor 15 away from the rotating gears 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 drive slots 14 are arc-shaped and are distributed circumferentially on the rotating gears 13. Fixed disks 25 are provided on both sides of the fixed rod 10. The device has several sliding grooves 26, each corresponding to a number of movable resistors 15. Inside each sliding groove 26, a first-stage additional resistor 27, a second-stage additional resistor 28, and a third-stage additional resistor 29 are slidably installed from the outside to the inside. At both ends of the first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29, there are sliding blocks 30 that slide inside the sliding groove 26. A return spring 31 is provided between each pair of adjacent sliding blocks 30. The top surfaces of the pressing resistor 19, the first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29 are all set in a concave arc shape. The bottom surfaces of the pressing resistor 19, the first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29 are all set in a convex arc shape, and the convex arc shape matches the concave arc shape.

[0040] During actual testing, the operator drives the control module to slowly rotate the rotating gear 13. Several arc-shaped drive grooves 14 on the rotating gear 13 rotate accordingly, causing the embedded slider 16 to move along a preset arc trajectory. The slider 16 pushes the connected movable resistor 15 forward within the corresponding groove 12. The movable resistor 15 has a pressure resistor 19 connected to its front end. When it reaches a certain position, the pressure 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 increased pressure, the resistor moves downward under the drive of the sliding block 30, connecting with the main circuit of the system, and the overall circuit resistance increases. If the gear continues to rotate, the pressure resistor 19 will further compress the first-stage pressure resistor. When the device is pushed to its limit position, it continues to press the second-stage added resistor 28 and then the third-stage resistor. During each stage of pressing, the sliding block 30 and the reset spring 31 work together to achieve flexible buffering and reversible operation. After the operation is completed, if the gear is rotated in the opposite direction, the pressed resistor 19 will gradually retract. The added resistors will be reset and disconnected from the circuit step by step under the action of the reset spring 31, thereby reducing the resistance value. The entire process can precisely control whether each stage of the resistor participates in conduction, thereby dynamically adjusting the overall load 9 resistance value. This achieves flexible control of impedance under different working conditions in simulated leakage testing, effectively solving the problems of traditional load 9 being non-adjustable, having low adjustment accuracy, or having a lag in response, and improving the adaptability, accuracy, and engineering practicality of power line information security testing.

[0041] The first stage adds resistor 27 with a resistance range of 22±0.5Ω and is made of Ni80Cr20 alloy foil; the second stage adds resistor 28 with a resistance range of 100±2Ω and is made of FeCrAlY high-temperature alloy; the third stage adds resistor 29 with a resistance range of 440±5Ω and is made of RuO2-SiO2 thick film resistor.

[0042] The three resistors are designed with resistance values ​​of 22±0.5Ω, 100±2Ω, and 440±5Ω, respectively, to create a resistance range from small to large, meeting the simulation needs from low load to high impedance leakage scenarios. Each stage has high accuracy adaptability, which is beneficial for simulating high-precision scenarios and progressive testing. The first stage Ni80Cr20 alloy foil resistor has low temperature drift and oxidation resistance, making it suitable for low-resistance precision applications, with fast response and high linearity. The second stage FeCrAlY high-temperature alloy resistor has excellent heat resistance, can withstand high current heat loads, and is suitable for medium-to-high power environments. The third stage RuO2-SiO2 thick film resistor has good stability, with good high-frequency performance and long-term stability, suitable for simulating complex load and noise leakage conditions. The multi-stage resistors are designed separately and pressed in step by step by the active resistor 15, which can effectively distribute the heat load, avoid concentrated heat generation causing single-point overheating, and improve the reliable operation time and response sensitivity of the system.

[0043] A shrinkage layer 33 is provided on the concave side of the compression resistor 19, the first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29. An expansion layer 32 is provided on the convex side of the compression resistor 19, the first-stage additional resistor 27, the second-stage additional resistor 28, and the third-stage additional resistor 29. 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 Celsius, the expansion layer 32 expands and can bulge and squeeze the shrinkage layer 33 to compensate for the temperature drift of the contact resistance.

[0044] The expansion layer 32 is made of copper-tungsten alloy, which has a high coefficient of thermal expansion (8.5×10⁻⁻⁶). 6 The shrinkage layer 33 is made of Invar 36 alloy, which has an ultra-low coefficient of thermal expansion (1.6×10⁻⁻⁶ / ℃). It can expand significantly at temperatures exceeding 80℃; the shrinkage layer 33 is made of Invar 36 alloy, which has an ultra-low coefficient of thermal expansion (1.6×10⁻⁶ / ℃). 6 / ℃) can suppress thermal deformation. When the temperature rises, the copper-tungsten alloy expansion layer 32 actively expands outward, pushing the protruding structure to penetrate deeper into the groove of the Invar alloy shrinkage layer 33, so that the contact area is expanded to more than twice the initial size. This passive temperature control mechanism can offset the contact resistance drift caused by high temperature without external energy. The material combination also has the characteristics of arc resistance and oxidation resistance, which is suitable for long-term high current conditions. It significantly improves the measurement consistency of the test equipment under extreme temperatures, further improving the accuracy and reliability of the test. The whole process can not only flexibly switch the load 9 combination according to the needs, but also ensure high-performance operation in harsh thermal environments. It can effectively compensate for problems such as metal material expansion and resistance change caused by high temperature, maintain the stability of electrical contact and the constantness of load 9 resistance, and improve the measurement accuracy and response consistency of the entire load 9 equipment under high temperature long-term working conditions.

[0045] like Figures 2 to 6 As shown, the adjustment module includes an extension plate 20 fixedly installed on one side of one of the fixed resistors 11. A meshing gear 21 is rotatably installed on the extension plate 20. The meshing gear 21 meshes with the rotating gear 13. A drive rod 23 is provided on one side of the meshing gear 21. The drive rod 23 passes through the load 9. An adjustment wheel 24 is provided at the other end of the drive rod 23. The fixed rod 10, the rotating gear 13, the extension plate 20, the meshing gear 21, the drive rod 23, and the adjustment wheel 24 are all made of insulating material.

[0046] During equipment operation, the operator can manually or by adding an external motor to drive the adjusting wheel 24 to rotate 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 meshes with the rotating gear 13 fixedly installed on the extension plate 20. As the meshing gear 21 rotates, the rotating gear 13 also rotates synchronously, causing 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 value of the load 9 circuit. The operator can continuously or stepwise adjust the resistance value by continuously adjusting the rotation angle of the wheel 24. The adjustment process does not require opening the box or disconnecting the power, ensuring the real-time performance and safety of the test process. Since all structural components involved in the adjustment action are made of insulating materials, the risk of electrical conduction is effectively isolated.

[0047] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0048] This 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 this invention should be included within the scope of protection of this invention.

Claims

1. A load for power line information leakage test, characterized by, include: The box (1) has a hollow interior, a radiator (2) is provided on one side of the box (1), and a partition is provided inside the box (1). Collector (5), the collector (5) is disposed inside the box (1) and located on one side of the partition; The controller (3) is located on one side of the housing (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). A control switch (6) is provided on one side of the controller (3). Load (9), the load (9) is located inside the housing (1) and 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. Several capacitors are provided inside the transmission block (8). A radial graded variable resistance assembly is disposed inside the load (9). The radial graded variable resistance assembly includes an adjustment module and a variable resistance module. The adjustment module is used to adjust the resistance value of the variable resistance module. The variable resistance module includes a fixed rod (10) fixedly installed in the middle of the load (9). Rotary gears (13) are rotatably mounted on both ends of the fixed rod (10). Several drive slots (14) are provided on the rotary gears (13). Several fixed resistors (11) are fixedly installed on the side of the load (9) near the rotary gears (13). Sliding grooves (12) are provided on each of the fixed resistors (11). Movable resistors (15) are slidably installed inside the sliding grooves (12). A slider (16) is provided on one side of the movable resistor (15). The slider (16) is slidably installed inside the drive slots (14). A first connecting block (17) is provided on the side of the movable resistor (15) away from the rotary gears (13). The other end of the first connecting block (17) is provided with… A second connecting block (18) is provided, and a compression resistor (19) is provided on one side of the second connecting block (18). A fixing plate (25) is provided on both sides of the fixing rod (10). A plurality of sliding grooves (26) are provided on the upper part of the fixing plate (25). The plurality of sliding grooves (26) correspond to a plurality of movable resistors (15). A first-level additional resistor (27), a second-level additional resistor (28), and a third-level additional resistor (29) are slidably installed in the sliding grooves (26) from the outside to the inside. Sliding blocks (30) that slide inside the sliding grooves (26) are provided at both ends of the first-level additional resistor (27), both ends of the second-level additional resistor (28), and both ends of the third-level additional resistor (29). 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 provided in a circular-arc concave shape, and the bottom surface of the compression resistor (19), the bottom surface of the first-stage additional resistor (27), the bottom surface of the second-stage additional resistor (28), and the bottom surface of the third-stage additional resistor (29) are all provided in a circular-arc convex shape, and the circular-arc convex shape is matched with the circular-arc concave shape; One side of the compression resistor (19), the first-stage additional resistor (27), the second-stage additional resistor (28), and the third-stage additional resistor (29) in the circular-arc concave shape is provided with a shrinkage layer (33), and one side of the compression resistor (19), the first-stage additional resistor (27), the second-stage additional resistor (28), and the third-stage additional resistor (29) in the circular-arc convex shape is provided as 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 eighty degrees, the expansion layer (32) expands to protrude and press the shrinkage layer (33), so as to compensate the temperature drift of the contact resistance; The resistance value range of the first-stage additional resistor (27) is 22±0.5Ω, and the material is Ni80Cr20 alloy foil; the resistance value range of the second-stage additional resistor (28) is 100±2Ω, and the material is FeCrAlY high-temperature alloy; and the resistance value range of the third-stage additional resistor (29) is 440±5Ω, and the material is RuO2-SiO2 thick film resistor.

2. The power line information leakage preventing test load according to claim 1, wherein The driving grooves (14) are provided in a circular-arc shape, and a plurality of the driving grooves (14) are distributed in a circumferential shape on the rotating gear (13).

3. The power line information leakage preventing test load according to claim 1, wherein The fixed disc (25) and the sliding block (30) are both provided in an insulating manner.

4. The power line information leakage preventing test load according to claim 1, wherein The adjusting module comprises an extension plate (20) fixedly installed on one side of one of the fixed resistors (11), the extension plate (20) is provided with a meshing gear (21) rotatably installed thereon, the meshing gear (21) is engaged with the rotating gear (13), one side of the meshing gear (21) is provided with a driving rod (23), the driving rod (23) penetrates through the load (9), and the other end of the driving rod (23) is provided with an adjusting wheel (24).

5. The power line information leakage preventing test load according to claim 4, wherein The fixed rod (10), the rotating gear (13), the extension plate (20), the meshing gear (21), the driving rod (23), and the adjusting wheel (24) are all provided in an insulating material.

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