Aging test device for doubly-fed converter insulation system

Abstract

The invention relates to the field of converter insulation system testing, and provides a doubly-fed converter insulation system aging test device which comprises a test box body, one side of the test box body is provided with an air inlet machine, and the test box body is internally provided with a test connection assembly used for testing and fixing. The bottom of the test connection assembly is provided with a vibration test assembly used for vibration test, the top of the test connection assembly is provided with a pressure test assembly used for pressure test, and through arrangement of a servo motor, an air inlet box and other structures, rapid and self-adaptive clamping and electrical connection of samples of different sizes are realized; the preparation time is greatly shortened; the aging gas is ensured to uniformly and stably flow from bottom to top, so that the environmental stress on the sample is consistent, the repeatability and accuracy of the test are improved, and the problems of single function and low efficiency in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of converter insulation system testing, and more specifically, to an aging test device for doubly fed converter insulation systems. Background Technology

[0002] As the core power conversion unit in systems such as wind power generation, the long-term reliability of doubly-fed induction generators (DFIGs) is crucial, and the performance of the insulation system is a key factor determining their lifespan and safety. Under actual operating conditions, the insulation materials inside the converter do not only bear a single stress, but are subjected to harsh conditions of coupled effects from multiple factors, including electrical, thermal, mechanical vibration, and complex atmospheric environments (such as potentially corrosive gases, humidity, and ozone). This synergistic effect of multiple stresses significantly accelerates the aging and deterioration process of the insulation materials, and its failure mechanism is far more complex than that of a single stress.

[0003] Currently, testing methods for the aging of insulation materials or systems typically involve single or sequential stress testing. For example, constant temperature and humidity chambers are used for damp heat aging tests, vibration tables for mechanical durability tests, or presses for static pressure tests. These traditional methods have significant limitations: First, the testing equipment has limited functionality and cannot simulate the combined stress field of heat, vibration, pressure, and ambient atmosphere present in real-world operation. Second, sequential stress application (such as thermal aging followed by vibration testing) fails to reflect the interaction and synergistic effects between various stress factors, leading to discrepancies between test results and actual conditions, making it difficult to accurately predict the lifespan and failure modes of insulation systems under complex real-world operating conditions. Furthermore, existing testing devices often lack versatility and automation in sample clamping, requiring frequent clamp changes for samples of different sizes, resulting in low efficiency and connection stability susceptible to interference from subsequent vibration tests. Summary of the Invention

[0004] This invention proposes an aging test device for the insulation system of a doubly fed converter, which solves the problems of limited functionality and low efficiency in related technologies.

[0005] The technical solution of the present invention is as follows: an aging test device for a doubly fed converter insulation system, comprising a test chamber; An air intake is installed on one side of the test chamber. Inside the test chamber, a test connection assembly for testing fixation is provided. At the bottom of the test connection assembly, a vibration test assembly for vibration testing is provided. At the top of the test connection assembly, a pressure test assembly for pressure testing is provided.

[0006] In a preferred embodiment of the present invention, the test connection assembly comprises a limiting base, which is fixedly connected inside the test chamber. A connecting base is slidably assembled inside the limiting base, and a servo motor is installed inside the connecting base. A rotating plate is installed at the output end of the servo motor. Four circumferentially distributed limiting moving blocks are slidably assembled inside the connecting base. A fixing plate is fixedly connected to the top of each limiting moving block. Test connectors are installed on two symmetrically arranged fixing plates. A hinge shaft is movably hinged to both the rotating plate and the limiting moving blocks.

[0007] In a preferred embodiment of the present invention, at least two symmetrically arranged limiting sliders are provided on each of the four sides of the connecting base. The limiting sliders are slidably assembled inside the limiting base. A first damper is connected between the limiting base and the limiting sliders. A lower heater is installed on the top of the connecting base.

[0008] As a preferred embodiment of the present invention, the bottom of the test chamber is provided with an air inlet box for connection with an air inlet machine, and the top of the test chamber is provided with an air outlet.

[0009] In a preferred embodiment of the present invention, the vibration testing assembly consists of a fixed base, which is fixedly connected to the interior of the connecting base. The top of the fixed base is provided with a connecting groove, and a vibration frame is provided inside the connecting groove.

[0010] As a preferred embodiment of the present invention, the vibration frame and the connecting groove are connected together by a plurality of second dampers that are equidistantly distributed, and the bottom of the vibration frame is provided with a plurality of vibration motors that are set at the same frequency.

[0011] In a preferred embodiment of the present invention, the pressure testing assembly comprises a pressure testing frame, which is fixedly connected inside the test chamber. A first cylinder is mounted on the top of the pressure testing frame, and a guide slide is mounted on the fixed output end of the first cylinder. Two symmetrically arranged limiting guide rails are fixedly connected inside the pressure testing frame. The guide slide is movably fitted onto the outer circumferential surface of the two limiting guide rails. A planar pressure testing block is fixedly connected to the bottom of the guide slide, and an upper heater is mounted on the bottom of the planar pressure testing block.

[0012] In a preferred embodiment of the present invention, a second cylinder is installed inside the guide slide frame, a sliding shaft is installed at the output end of the second cylinder, a dotted pressure test plate is slidably assembled inside the guide slide frame, and the sliding shaft is fixedly connected to the dotted pressure test plate at the output end of the second cylinder.

[0013] The working principle and beneficial effects of this invention are as follows: 1. This invention, through the design of servo motors, air intake boxes, and other structures, enables rapid and adaptive clamping and electrical connection of samples of different sizes, significantly shortening preparation time; it ensures uniform and stable flow of aging gas from bottom to top, making the sample subjected to consistent environmental stress, and improving the repeatability and accuracy of the test.

[0014] 2. This invention, by integrating a vibration motor, a second damper, and other structures, can simulate wide-frequency mechanical vibration under real working conditions and control the transmission through the damper; the latter can apply uniform surface pressure and concentrated point pressure independently or in combination, and combined with upper and lower heaters, it achieves high-fidelity coupling of multiple stress factors such as heat, vibration, pressure, and environment, and can more comprehensively and realistically evaluate the aging behavior of the insulation system under complex conditions. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the test chamber of the present invention; Figure 3 This is a schematic diagram of the overall structure of the test connection component of the present invention; Figure 4 This is a schematic diagram of the internal structure of the test connection component of the present invention; Figure 5 This is a bottom view of the internal structure of the test connection component of the present invention; Figure 6 This is a schematic diagram of the overall structure of the vibration testing component of the present invention; Figure 7 This is a schematic diagram of the internal structure of the vibration testing component of the present invention; Figure 8 This is a schematic diagram of the overall structure of the pressure testing component of the present invention; Figure 9 This is a schematic diagram of the internal structure of the pressure testing component of the present invention.

[0017] In the diagram: 1. Test chamber; 2. Air inlet; 21. Air inlet box; 22. Air outlet; 3. Test connection components; 301. Limiting base; 302. Connecting base; 303. Limiting slider; 304. First damper; 305. Lower heater; 306. Servo motor; 307. Rotating plate; 308. Hinge shaft; 309. Fixing plate; 310. Limiting moving block; 311. Test connector; 4. Vibration testing components; 401. Fixed base; 402. Connecting groove; 403. Vibration frame; 404. Second damper; 405. Vibration motor; 5. Pressure testing components; 501. Pressure testing frame; 502. Limiting guide rail; 503. First cylinder; 504. Guide slide frame; 505. Planar pressure testing block; 506. Upper heater; 507. Second cylinder; 508. Sliding shaft; 509. Point pressure testing plate. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-9 As shown, an aging test device for a doubly fed converter insulation system includes a test chamber 1; An air intake 2 is installed on one side of the test chamber 1. A test connection assembly 3 for test fixation is provided inside the test chamber 1. A vibration test assembly 4 for vibration testing is provided at the bottom of the test connection assembly 3. A pressure test assembly 5 for pressure testing is provided at the top of the test connection assembly 3.

[0020] The core of an aging test device for a doubly fed converter insulation system is a sealed test chamber 1. An air inlet 2 is installed on one side of the chamber to introduce a gas of a specific composition into the chamber to simulate the aging environment. Inside the chamber, a test connection assembly 3 is provided for the installation and electrical connection of the insulation system under test. Directly below the test connection assembly 3, a vibration test assembly 4 is integrated, which can generate controllable mechanical vibration to simulate the vibration stress during equipment operation. Directly above the test connection assembly 3, a pressure test assembly 5 is installed to apply static or dynamic mechanical pressure to the test component. During the test, the insulation system sample under test is fixed on the test connection assembly 3 and simultaneously withstands the ambient gas from the air inlet 2, the vibration from the vibration test assembly 4, and the pressure from the pressure test assembly 5, thereby realizing accelerated aging test with multiple stress factors coupled together.

[0021] The test connection assembly 3 consists of a limiting base 301, which is fixedly connected inside the test chamber 1. A connecting base 302 is slidably assembled inside the limiting base 301. A servo motor 306 is installed inside the connecting base 302. A rotating plate 307 is installed at the output end of the servo motor 306. Four circumferentially distributed limiting moving blocks 310 are slidably assembled inside the connecting base 302. A fixing plate 309 is fixedly connected to the top of the limiting moving blocks 310. Test connectors 311 are installed on two symmetrically arranged fixing plates 309. A hinge shaft 308 is movably hinged to the rotating plate 307 and the limiting moving blocks 310.

[0022] The test connection assembly 3 includes a limiting base 301 fixed to the bottom of the test chamber 1, and a connecting base 302 that slides with the limiting base 301 via a slider structure at its bottom, allowing it to move within a small range in the horizontal plane. A servo motor 306 is mounted at the center inside the connecting base 302. The output shaft of the servo motor 306 is vertically upward and fixedly mounted with a circular rotating plate 307. Around the servo motor 306, four limiting moving blocks 310 are slidably mounted in a circumferentially distributed manner within the connecting base 302. Each limiting moving block 310 has a fixed plate 309 vertically fixed to its top. Two symmetrical fixed plates 309 are equipped with test connectors 311 for electrically connecting the insulation system sample under test. Each limit moving block 310 is movably connected to the rotating plate 307 above through a hinge shaft 308. When the servo motor 306 is started, it drives the rotating plate 307 to rotate. The rotating plate 307 pushes or pulls the four limit moving blocks 310 synchronously inward or outward along the radial direction of the connecting base 302 through the four hinge shafts 308, thereby driving the four fixed plates 309 and the test connectors 311 on them to move, realizing the rapid clamping, positioning and electrical connection of the test samples of different sizes and specifications.

[0023] At least two symmetrically arranged limiting sliders 303 are provided on each of the four sides of the connecting base 302. The limiting sliders 303 are slidably assembled inside the limiting base 301. A first damper 304 is connected between the limiting base 301 and the limiting sliders 303. A lower heater 305 is installed on the top of the connecting base 302.

[0024] At least two symmetrically arranged limiting sliders 303 are provided on each of the four sides of the connecting base 302. The limiting sliders 303 are slidably fitted into corresponding guide grooves inside the limiting base 301, ensuring the smooth movement of the connecting base 302. A first damper 304 is connected between the limiting base 301 and each limiting slider 303. When the connecting base 302 is displaced due to external vibration or internal movement, the first damper 304 can effectively absorb energy and provide restoring force, so that the connecting base 302 and the test sample fixed on it can quickly return to their original positions, reducing test interference. In addition, a lower heater 305 is installed at the center of the top plane of the connecting base 302. Its function is to convert electrical energy into heat energy and directly heat the bottom area of ​​the test insulation system sample installed above it, simulating the heating conditions of the internal components during equipment operation.

[0025] The bottom of the test chamber 1 is provided with an air inlet box 21 for connecting to the air inlet machine 2, and the top of the test chamber 1 is provided with an air outlet 22.

[0026] Gas circulation path structure within test chamber 1: The bottom of test chamber 1 is not flat, but rather has an independent air inlet chamber 21 connected to the interior of the chamber. The output pipe of the air inlet pump 2 is directly connected to this air inlet chamber 21, allowing the introduced aging gas to first enter the bottom cavity. This design facilitates uniform gas diffusion from bottom to top within the chamber. At the top of test chamber 1, one or more air outlets 22 are provided to discharge the gas from the chamber, which can be connected to an exhaust gas treatment device or form a circulation loop. During operation, the air inlet pump 2 continuously supplies gas to the air inlet chamber 21. The gas flows upward from the bottom of the chamber, fully surrounding and acting on the sample under test, before being discharged from the air outlet 22 at the top. This creates a stable and controllable airflow environment within the chamber, ensuring that all parts of the sample under test are exposed to a consistent concentration of aging gas.

[0027] The vibration test assembly 4 consists of a fixed base 401, which is fixedly connected to the inside of the connecting base 302. The top of the fixed base 401 is provided with a connecting groove 402, and the inside of the connecting groove 402 is provided with a vibration frame 403.

[0028] The vibration testing assembly 4 is centered around a fixed base 401, which is securely mounted inside and below a connecting base 302. A rectangular connecting groove 402 is machined into the top of the fixed base 401. A vibration frame 403 is embedded in this connecting groove 402 at its lower part, forming a mating structure with the fixed base 401. The upper surface of the vibration frame 403 is used to support or indirectly connect the sample to be tested via a structure. The vibration frame 403 is not rigidly fixed to the connecting groove 402 of the fixed base 401, but rather there is a certain amount of clearance, allowing the vibration frame 403 to move slightly relative to the fixed base 401 in both horizontal and vertical directions. This is the basic structure for generating vibration transmission.

[0029] The vibration frame 403 and the connecting groove 402 are connected together by a number of equally spaced second dampers 404, and the bottom of the vibration frame 403 is provided with a number of vibration motors 405 with the same frequency.

[0030] Several second dampers 404 are evenly connected between the connecting groove 402 of the vibrating frame 403 and the fixed base 401. These dampers provide buffering and limiting when the vibrating frame 403 moves. The power comes from several vibration motors 405 installed at the bottom of the vibrating frame 403. The vibration motors 405 are set at the same frequency to ensure that the direction of the excitation force generated during operation is consistent with the frequency, forming a resultant force. When the vibration motor 405 starts, its internal eccentric block rotates at high speed to generate centrifugal force. This periodically changing force acts directly on the vibrating frame 403, forcing the vibrating frame 403 to overcome the damping effect of the second dampers 404 and start high-frequency micro-amplitude vibration. The vibration is transmitted through the structure to the connecting base 302 and the sample under test, simulating the mechanical vibration stress in actual operation. The second dampers 404 absorb part of the vibration energy and prevent resonance, while also ensuring the controllability of vibration transmission.

[0031] The pressure testing assembly 5 consists of a pressure testing frame 501, which is fixedly connected inside the test chamber 1. A first cylinder 503 is installed on the top of the pressure testing frame 501, and a guide slide frame 504 is installed on the fixed output end of the first cylinder 503. Two symmetrically arranged limiting guide rails 502 are fixedly connected inside the pressure testing frame 501. The guide slide frame 504 is movably sleeved on the outer circumferential surface of the two limiting guide rails 502. A planar pressure testing block 505 is fixedly connected to the bottom of the guide slide frame 504, and an upper heater 506 is installed on the bottom of the planar pressure testing block 505.

[0032] The pressure testing assembly 5 includes a pressure testing frame 501 fixed at the top of the test chamber 1. A first cylinder 503 is installed at the top center of the pressure testing frame 501. The piston rod of the first cylinder 503 extends downward, and a guide slide frame 504 is fixedly installed at the end of the piston rod. Two vertical, parallel, and symmetrically arranged limiting guide rails 502 are fixed on both sides inside the pressure testing frame 501. The guide slide frame 504 is movably fitted onto these two limiting guide rails 502 via sliding sleeves or bearings on both sides, ensuring… To ensure that it can only slide smoothly in the vertical direction without lateral swaying, a planar pressure test block 505 is fixedly installed at the bottom of the guide slide frame 504. The bottom surface of the test block is flat, and an upper heater 506 is also embedded on its lower surface for heating the sample from above. When it is necessary to apply uniform planar pressure to the sample, the first cylinder 503 is activated, pushing the guide slide frame 504 to move downward along the limiting guide rail 502, thereby driving the planar pressure test block 505 to press on the top surface of the insulation system sample under test with constant pressure or stroke.

[0033] A second cylinder 507 is installed inside the guide slide frame 504. A sliding shaft 508 is installed at the output end of the second cylinder 507. A point pressure test plate 509 is slidably assembled inside the guide slide frame 504. The sliding shaft 508 is installed at the output end of the second cylinder 507 and is fixedly connected to the point pressure test plate 509.

[0034] Inside the guide frame 504, a second cylinder 507 is additionally installed, with its piston rod pointing vertically downwards. A sliding shaft 508 is mounted at the output end of the piston rod. Simultaneously, a point pressure test plate 509 is slidably mounted inside the guide frame 504 via its own guide structure, located above or to the side of the planar pressure test block 505, and can move independently in the vertical direction. The piston rod of the second cylinder 507 is fixedly connected to the point pressure test plate 509 via the sliding shaft 508. When a point pressure test is required, the first cylinder 503 is activated first, maintaining a certain distance or slight contact between the entire planar pressure test block 505 and the sample surface. Then, the second cylinder 507 is activated independently, driving the sliding shaft 508 downwards, which in turn pushes the point pressure test plate 509 downwards, applying concentrated stress to specific local locations on the sample surface using its bottom protrusions or small-area pressure heads. This is used to test the performance degradation of insulating materials under localized high voltage.

[0035] Working Principle: The insulation system sample to be tested is placed on top of the connecting base 302 of the test connection assembly 3 inside the test chamber 1. The servo motor 306 is started, driving the rotating plate 307 at its output end to rotate. The rotating plate 307, through four hinge shafts 308, pushes four circumferentially distributed, slidingly assembled limiting moving blocks 310 within the connecting base 302 to move radially in sync. This causes the fixing plate 309 fixed to the top of the limiting moving blocks 310 and the test connector 311 mounted on two symmetrical fixing plates 309 to adjust their positions to accommodate and clamp samples of different sizes, completing the electrical connection and mechanical fixation. The connecting base 302 slides with the limiting base 301 fixed inside the test chamber 1 via its four limiting sliders 303, and is stabilized and reset by the first damper 304. After the test begins, the air inlet 2 introduces specific aging gas into the air inlet box 21 at the bottom of the test chamber 1. The gas flows upwards through the sample and exits from the top outlet 22, creating a stable environment. Simultaneously, the vibration testing component 4 integrated inside the connecting base 302 is activated: within the connecting groove 402 at the top of its fixed base 401, the vibration frame 403 generates high-frequency micro-amplitude vibrations driven by several vibration motors 405 set at the same frequency at the bottom. This vibration is buffered and guided by multiple second dampers 404 and then transmitted to the entire connecting base 302 and the sample, simulating vibration stress. The pressure testing component 5 located above the sample also works simultaneously: the first cylinder 503 inside the pressure testing frame 501 pushes the guide slide frame 504 smoothly down along two vertical limiting guide rails 502, causing the planar pressure testing block 505 fixed at its bottom to apply uniform planar pressure to the sample surface; if local stress testing is required, the second cylinder 507 inside the guide slide frame 504 is activated, driving the sliding shaft 508 to push the slidingly assembled point pressure testing plate 509 downward, causing it to bulge out and apply pressure to specific points on the sample. Throughout the process, the upper heater 506 installed at the bottom of the planar pressure test block 505 and the lower heater 305 installed at the top of the connecting base 302 heat the sample from both the top and bottom directions, simulating thermal stress. Thus, with the test connection assembly 3 fixed in place, the sample simultaneously endures the gas environment formed by the air inlet 2, the air inlet box 21, and the air outlet 22; the mechanical vibration formed by the vibration motor 405, the vibration frame 403, and the second damper 404; the mechanical pressure formed by the first cylinder 503, the planar pressure test block 505, the second cylinder 507, and the point pressure test plate 509; and the thermal cycle from the upper heater 506 and the lower heater 305, achieving accelerated aging testing with multiple stress factors coupled together.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An aging test device for a doubly-fed converter insulation system, comprising a test chamber (1), characterized in that... ； An air intake unit (2) is installed on one side of the test chamber (1). A test connection assembly (3) for testing fixation is provided inside the test chamber (1). A vibration test assembly (4) for vibration testing is provided at the bottom of the test connection assembly (3). A pressure test assembly (5) for pressure testing is provided at the top of the test connection assembly (3).

2. The aging test device for a doubly-fed converter insulation system according to claim 1, characterized in that, The test connection assembly (3) consists of a limiting base (301), which is fixedly connected inside the test box (1). A connecting base (302) is slidably assembled inside the limiting base (301). A servo motor (306) is installed inside the connecting base (302). A rotating plate (307) is installed at the output end of the servo motor (306). Four circumferentially distributed limiting moving blocks (310) are slidably assembled inside the connecting base (302). A fixing plate (309) is fixedly connected to the top of the limiting moving block (310). Test connectors (311) are installed on two symmetrically arranged fixing plates (309). A hinge shaft (308) is movably hinged to the rotating plate (307) and the limiting moving block (310).

3. The aging test device for the insulation system of a doubly-fed converter according to claim 2, characterized in that, The connecting base (302) is provided with at least two symmetrically arranged limiting sliders (303) on all four sides. The limiting sliders (303) are slidably assembled inside the limiting base (301). The limiting base (301) and the limiting sliders (303) are connected together by a first damper (304). The top of the connecting base (302) is equipped with a lower heater (305).

4. The aging test device for a doubly-fed converter insulation system according to claim 1, characterized in that, The bottom of the test chamber (1) is provided with an air inlet box (21) for connecting to the air inlet machine (2), and the top of the test chamber (1) is provided with an air outlet (22).

5. The aging test device for the insulation system of a doubly-fed converter according to claim 2, characterized in that, The vibration test assembly (4) consists of a fixed base (401), which is fixedly connected to the inside of the connecting base (302). A connecting groove (402) is provided on the top of the fixed base (401), and a vibration frame (403) is provided inside the connecting groove (402).

6. The aging test device for a doubly-fed converter insulation system according to claim 5, characterized in that, The vibration frame (403) and the connecting groove (402) are connected together by a number of equally spaced second dampers (404), and the bottom of the vibration frame (403) is provided with a number of vibration motors (405) with the same frequency.

7. The aging test device for a doubly-fed converter insulation system according to claim 1, characterized in that, The pressure testing assembly (5) consists of a pressure testing frame (501), which is fixedly connected inside the test chamber (1). A first cylinder (503) is installed on the top of the pressure testing frame (501), and a guide slide frame (504) is installed on the fixed output end of the first cylinder (503). Two symmetrically arranged limiting guide rails (502) are fixedly connected inside the pressure testing frame (501). The guide slide frame (504) is movably sleeved on the outer circumferential surface of the two limiting guide rails (502). A planar pressure testing block (505) is fixedly connected to the bottom of the guide slide frame (504), and an upper heater (506) is installed on the bottom of the planar pressure testing block (505).

8. The aging test device for the insulation system of a doubly-fed converter according to claim 7, characterized in that, The guide slide frame (504) is equipped with a second cylinder (507), and a sliding shaft (508) is installed at the output end of the second cylinder (507). A dotted pressure test plate (509) is slidably assembled inside the guide slide frame (504), and the sliding shaft (508) is installed at the output end of the second cylinder (507). The sliding shaft (508) is fixedly connected to the dotted pressure test plate (509).

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