A test apparatus for bushings of oil-immersed transformers

Abstract

This utility model discloses a testing device for oil-immersed transformer bushings, relating to the field of transformer testing technology. It includes a base, with a control device mounted on one side of the top of the base. A fixing mechanism and a testing mechanism are provided on the top of the base. The testing mechanism includes a base plate connected to the base, with a fixing frame fixedly connected to the top of the base plate. Through the fixing and testing mechanisms, this utility model allows for efficient operation. After the bushing body is fixed, when a high-temperature test is required, the heater is activated, and hot air is evenly distributed over the bushing body via a heat-conducting rod and ring. When a low-temperature test is required, the heater is turned off, a cooling fan is activated, and a valve is opened to allow cold air to be blown into the sealed tube through the connecting pipe, cooling the bushing body. This device can simulate the working state of the bushing under different temperature environments, improving the quality and reliability of the bushing.

Description

Technical Field

[0001] This utility model relates to the field of transformer testing technology, specifically a testing device for bushings of oil-immersed transformers. Background Technology

[0002] As a core piece of equipment in the power system, the bushings of oil-immersed transformers serve as insulation and mechanical support between the high-voltage conductors and the transformer tank. They operate under complex conditions of high voltage, high temperature oil immersion, and fluctuating loads. During actual operation, the transformer's internal temperature cycle is significantly affected by periodic changes in grid load (such as day-night peak-valley differences in electricity consumption and seasonal fluctuations in electricity demand). When the load increases, the windings and core heat up, causing the oil temperature to rise, and the insulating oil and metal components inside the bushing heat up simultaneously. When the load decreases, heat dissipation causes the temperature to drop. This repeated thermal expansion and contraction process causes mechanical stress fatigue on the bushing's insulation materials (such as oil-paper insulation and epoxy resin), seals (such as rubber seals), and welded joints (such as the connection between the bushing and the tank). This can lead to insulation aging, seal failure (oil leakage), and weld cracking, ultimately threatening the safe and stable operation of the transformer.

[0003] However, existing devices mostly rely on single tests and cannot accurately simulate the periodic and wide-range temperature changes in actual operation. They are also unable to reproduce the cumulative effect of thermal expansion and contraction experienced by bushings under long-term load fluctuations. Therefore, we propose a more convenient and practical test device for oil-immersed transformer bushings to meet the usage requirements. Utility Model Content

[0004] The purpose of this invention is to provide a testing device for bushings of oil-immersed transformers to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a testing device for oil-immersed transformer bushings, comprising a base, a control device installed on one side of the top of the base, a fixing mechanism and a testing mechanism provided on the top of the base; the testing mechanism includes a base plate, which is connected to the base, a fixing frame is fixedly connected to the top of the base plate, a through hole is opened on one side of the fixing frame, a lead screw is rotatably connected in the through hole, a sliding block is slidably connected to the inner wall of one side of the fixing frame, the sliding block and the lead screw are threadedly connected, an L-shaped support frame is fixedly connected to the top of the sliding block, and a heating component and a cooling component are respectively provided on one side of the support frame.

[0006] Furthermore, the fixing mechanism includes a fixing plate, which is connected to the base, and a connecting plate is fixedly connected to one side of the top of the fixing plate.

[0007] Furthermore, a fixed flange is fixedly connected to one side of the connecting plate, and a sleeve body is provided on one side of the fixed flange. Bolts are installed between the sleeve body and the fixed flange.

[0008] Furthermore, the heating assembly includes a mounting plate connected to a support frame, and a sealing tube is fixedly connected to one side of the mounting plate, the diameter of which is larger than that of the sleeve body.

[0009] Furthermore, a heater is installed on one side of the mounting plate, and several heat-conducting rings are provided on the inner wall of the sealing tube. A heat-conducting rod is fixedly connected to one side of the heat-conducting rings, and one end of the heat-conducting rod is connected to the heater.

[0010] Furthermore, the cooling assembly includes a connecting pipe, one end of which is connected to a sealing pipe, and the other end is equipped with a cooling fan. A valve is installed on the outer wall of the connecting pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This testing device for oil-immersed transformer bushings, through the setting of a fixing mechanism and a testing mechanism, allows for the following operation: After the bushing body is fixed, the motor drives the lead screw to rotate, causing the sliding block, support frame, and mounting plate to move along the fixing frame and base plate, thereby inserting the sealing tube into the outer wall of the bushing body. When a high-temperature test is required, the heater is activated, and hot air is evenly distributed over the bushing body through the heat-conducting rod and heat-conducting ring for testing. When a low-temperature test is required, the heater is turned off, the cooling fan is activated, and the valve is opened to allow cold air to be blown into the sealing tube through the connecting pipe, cooling the bushing body. This device can simulate the working state of the bushing under different temperature environments, comprehensively test the performance of the bushing under high and low temperature conditions, improve the quality and reliability of the bushing, and is highly practical and suitable for widespread application.

[0012] Meanwhile, the installation and disassembly of the fixing mechanism are simple, convenient and quick, which can improve the efficiency of the test and save a lot of time and manpower. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the fixing mechanism structure of this utility model; Figure 3 This is a schematic diagram of the test mechanism structure of this utility model.

[0014] In the diagram: 1. Base; 2. Control equipment; 3. Fixing mechanism; 301. Fixing plate; 302. Connecting plate; 303. Fixing flange; 304. Sleeve body; 305. Bolt; 4. Testing mechanism; 401. Base plate; 402. Fixing frame; 403. Screw rod; 404. Sliding block; 405. Support frame; 406. Mounting plate; 407. Sealing pipe; 408. Heater; 409. Heat-conducting ring; 410. Heat-conducting rod; 411. Connecting pipe; 412. Cooling fan; 413. Valve. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the transformer production process, testing equipment is required. The testing equipment provided by this utility model is specifically used for testing oil-immersed transformer bushings in the transformer production process. During the testing process using this equipment, the bushing body 304 needs to be fastened to the bolts 305 through the fixing flange 303 to ensure that there is no shaking or displacement during the test, so as to avoid affecting the testing accuracy. During the high temperature test, it is necessary to confirm that the heat-conducting ring 409 is tightly attached to the outer wall of the bushing. Before the low temperature test, the heater 408 is turned off and the valve 413 is opened to avoid thermal shock damage to the equipment. During the test, the temperature change, bushing insulation performance and other data are recorded in real time through the control equipment 2 to ensure that the test data is complete and traceable.

[0017] like Figures 1-3 As shown, this utility model provides a technical solution: a test device for oil-immersed transformer bushings, including a base 1, a control device 2 installed on one side of the top of the base 1, a fixing mechanism 3 and a test mechanism 4 provided on the top of the base 1; the test mechanism 4 includes a base plate 401, which is connected to the base 1, a fixing frame 402 is fixedly connected to the top of the base plate 401, a through hole is opened on one side of the fixing frame 402, a lead screw 403 is rotatably connected in the through hole, a sliding block 404 is slidably connected to the inner wall of one side of the fixing frame 402, the sliding block 404 and the lead screw 403 are threadedly connected, an L-shaped support frame 405 is fixedly connected to the top of the sliding block 404, and a heating component and a cooling component are respectively provided on one side of the support frame 405.

[0018] like Figure 2As shown, the fixing mechanism 3 includes a fixing plate 301, which is connected to the base 1. A connecting plate 302 is fixedly connected to one side of the top of the fixing plate 301, and a fixing flange 303 is fixedly connected to one side of the connecting plate 302. A sleeve body 304 is provided on one side of the fixing flange 303, and bolts 305 are installed between the sleeve body 304 and the fixing flange 303.

[0019] It should be noted that during use, first install the fixing plate 301 on the base 1, then place the sleeve body 304 on one side of the connecting plate 302 and the fixing flange 303, and fix the sleeve body 304 to the fixing flange 303 with bolts 305. The installation and disassembly of the fixing mechanism 3 is simple, convenient and quick, which can improve the test efficiency and save a lot of time and manpower.

[0020] like Figure 3 As shown, the heating assembly includes a mounting plate 406, which is connected to a support frame 405. A sealing tube 407 is fixedly connected to one side of the mounting plate 406. The diameter of the sealing tube 407 is larger than that of the sleeve body 304. A heater 408 is installed on one side of the mounting plate 406. Several heat-conducting rings 409 are provided on the inner wall of the sealing tube 407. A heat-conducting rod 410 is fixedly connected to one side of the heat-conducting rings 409. One end of the heat-conducting rod 410 is connected to the heater 408. The cooling assembly includes a connecting pipe 411, which is connected to the sealing tube 407 at one end and a cooling fan 412 is installed at the other end. A valve 413 is installed on the outer wall of the connecting pipe 411.

[0021] It should be noted that during use, after the sleeve body 304 is fixed, the motor drives the lead screw 403 to rotate, which drives the sliding block 404, support frame 405 and mounting plate 406 to move along the fixed frame 402 and base plate 401, thereby driving the sealing tube 407 to be inserted into the outer wall of the sleeve body 304. When a high-temperature test is required, the heater 408 is started, and the hot air is evenly covered by the heat-conducting rod 410 and heat-conducting ring 409 to conduct the test. When a low-temperature test is required, the heater 408 is turned off, the cooling fan 412 is started and the valve 413 is opened to allow cold air to be blown into the sealing tube 407 under the action of the connecting pipe 411 to cool the sleeve body 304. The test mechanism 4 can adjust the distance between the heating component and the cooling component and the sleeve body 304 according to the actual position of the sleeve body 304 and the test requirements to ensure uniform heating and cooling effect and improve the accuracy and reliability of the test.

[0022] During use, the sleeve body 304 is first placed on one side of the connecting plate 302 and the fixed flange 303, and then fixed to the fixed flange 303 with bolts 305. After the sleeve body 304 is fixed, the motor drive screw 403 is rotated by the control device 2, which drives the sliding block 404, support frame 405 and mounting plate 406 to move along the fixed frame 402 and the base plate 401, thereby driving the sealing tube 407 to insert into the outer wall of the sleeve body 304. When a high-temperature test is required, the heater 408 is activated. The heat-conducting rod 410 and heat-conducting ring 409 ensure that hot air evenly covers the sleeve body 304 for testing. When a low-temperature test is required, the heater 408 is turned off, the cooling fan 412 is started, and the valve 413 is opened to allow cold air to be blown into the sealing pipe 407 under the action of the connecting pipe 411, thereby cooling the sleeve body 304. The test results are displayed through the control device 2. This device can simulate the working state of the sleeve under different temperature environments, comprehensively test the performance of the sleeve under high and low temperature conditions, and improve the quality and reliability of the sleeve.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A testing device for bushings of oil-immersed transformers, comprising a base (1), wherein a control device (2) is mounted on one side of the top of the base (1), characterized in that: The base (1) is provided with a fixing mechanism (3) and a testing mechanism (4) on its top. The test mechanism (4) includes a base plate (401), which is connected to the base (1). A fixed frame (402) is fixedly connected to the top of the base plate (401). A through hole is opened on one side of the fixed frame (402), and a lead screw (403) is rotatably connected in the through hole. A sliding block (404) is slidably connected to the inner wall of one side of the fixed frame (402). The sliding block (404) and the lead screw (403) are threadedly connected. An L-shaped support frame (405) is fixedly connected to the top of the sliding block (404). A heating component and a cooling component are respectively provided on one side of the support frame (405).

2. The testing apparatus for oil-immersed transformer bushings according to claim 1, characterized in that: The fixing mechanism (3) includes a fixing plate (301), which is connected to the base (1). A connecting plate (302) is fixedly connected to one side of the top of the fixing plate (301).

3. The testing apparatus for bushings of oil-immersed transformers according to claim 2, characterized in that: A fixed flange (303) is fixedly connected to one side of the connecting plate (302), and a sleeve body (304) is provided on one side of the fixed flange (303). Bolts (305) are installed between the sleeve body (304) and the fixed flange (303).

4. The testing apparatus for oil-immersed transformer bushings according to claim 1, characterized in that: The heating assembly includes a mounting plate (406), which is connected to a support frame (405). A sealing tube (407) is fixedly connected to one side of the mounting plate (406), and the diameter of the sealing tube (407) is larger than that of the sleeve body (304).

5. The testing apparatus for oil-immersed transformer bushings according to claim 4, characterized in that: A heater (408) is installed on one side of the mounting plate (406), and a number of heat-conducting rings (409) are provided on the inner wall of the sealing tube (407). A heat-conducting rod (410) is fixedly connected to one side of the heat-conducting ring (409), and one end of the heat-conducting rod (410) is connected to the heater (408).

6. The testing apparatus for oil-immersed transformer bushings according to claim 4, characterized in that: The cooling assembly includes a connecting pipe (411), one end of which is connected to a sealing pipe (407), and the other end is equipped with a cooling fan (412). A valve (413) is installed on the outer wall of the connecting pipe (411).

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