A transformer temperature rise testing device

Abstract

The utility model discloses a transformer temperature rise testing arrangement, solved the transformer temperature rise test environment and actual working condition do not tally, lead to the problem that the temperature rise abnormality appears in the transformer use process, including the cabinet body, fan, frequency converter, first baffle, second baffle, anemograph fixing clamp and anemograph, the fan is located the cabinet body top, is connected through frequency converter and power switch, the cabinet body bottom is used for installing transformer, the two opposite sides of cabinet body are equipped with the cabinet door respectively, is provided with the air inlet on the cabinet door, the two sides adjacent with the cabinet door are provided with first support column and second support column, and the first baffle is located between transformer and fan, and the both ends are respectively with first support column and second support column detachable connection, and the first baffle has the ventilation hole on it, is used for adjusting the air velocity of transformer designated test point position, the second baffle sets up at the air inlet, and the anemograph fixing clamp is located in the cabinet body and is used for installing anemograph, to measure the air velocity of transformer designated test point position.

Description

Technical Field

[0001] This utility model relates to a transformer testing device, specifically a transformer temperature rise testing device. Background Technology

[0002] General-purpose test power supplies are primarily used to simulate different power supply conditions for performance verification, functional testing, and troubleshooting of electronic / electrical equipment. For example, in the performance testing of power equipment, they simulate rated, overload, and fluctuating power supply conditions for equipment such as transformers, motors, inverters, and charging piles. This includes providing rated voltage / load current to transformers to measure losses, and providing adjustable frequency to motors to measure speed-torque characteristics, thereby evaluating whether the electrical performance, energy efficiency, and reliability of the equipment meet the standards.

[0003] General-purpose test power supplies contain a transformer to regulate voltage amplitude, achieving high- and low-voltage isolation while reducing power supply size. Because the chassis of a general-purpose test power supply integrates power modules, control circuits, capacitors, and other components, these components generate heat during operation, resulting in a relatively high ambient temperature for the transformer. Poor transformer heat dissipation can lead to the inability to dissipate heat effectively, causing the transformer temperature to rise continuously. This can easily lead to insulation failure, parameter accuracy drift, and a significant reduction in lifespan. In severe cases, it may trigger protective shutdown, affecting the normal operation of the general-purpose test power supply. Therefore, the temperature rise technical requirements for the transformer installed inside the general-purpose test power supply are quite stringent.

[0004] Before a transformer leaves the factory, the manufacturer typically tests its temperature rise performance. This usually involves placing the transformer on an open, unobstructed surface and simulating rated load to monitor temperature changes in the windings, core, and oil, verifying that the temperature rise meets design standards. However, the enclosures of general-purpose test power supplies are typically enclosed or semi-enclosed, leading to a mismatch between the factory testing environment and the actual application environment. This can result in situations where the transformer passes the factory temperature rise test, but after being installed in the general-purpose test power supply, abnormal temperature rise causes the power supply to malfunction, leading to increased difficulty and cost of subsequent repairs. Utility Model Content

[0005] The purpose of this invention is to solve the technical problem that the transformer temperature rise test environment does not match the actual application conditions, resulting in abnormal temperature rise during transformer use, and to provide a transformer temperature rise test device.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A transformer temperature rise testing device, characterized in that it includes a cabinet, a fan, a frequency converter, a first baffle plate, a second baffle plate, a wind speed meter fixing fixture, and a wind speed meter;

[0008] The fan is located at the top of the cabinet and is connected to the power switch through the frequency converter. The bottom of the cabinet is used to install the transformer. Cabinet doors are provided on two opposite sides of the cabinet, and air inlets are provided on the cabinet doors.

[0009] On the other two opposite sides of the cabinet, a first support column and a second support column are respectively provided. The first wind baffle is located between the transformer and the fan, and its two ends are detachably connected to the first support column and the second support column respectively. The first wind baffle has ventilation holes. By moving closer to or further away from the fan, the wind speed at the designated test point of the transformer can be adjusted.

[0010] The second wind deflector is located at the air inlet of the cabinet door. By adjusting the position of the second wind deflector that blocks the air inlet, the wind speed at the designated test point of the transformer can be adjusted.

[0011] The anemometer fixing fixture is located inside the cabinet, on which the anemometer is mounted to measure the wind speed at a designated test point of the transformer.

[0012] Furthermore, the first windbreak plate includes a mother plate and a daughter plate nested within the mother plate via a slide rail. Both the mother plate and the daughter plate have ventilation holes, and the area between any two ventilation holes is a windbreak section. The two ends of the mother plate are detachably connected to the first support column and the second support column, respectively. By adjusting the relative position of the daughter plate and the mother plate, the overlapping area of ​​the ventilation holes of the mother plate and the daughter plate is determined, so as to adjust the wind speed at the designated test point of the transformer.

[0013] Furthermore, there are two first wind deflectors, both of which are horizontally arranged. Their two ends are slidably connected to the first support column and the second support column, respectively, and can move vertically to move closer to or away from the fan. The projections of the two first wind deflectors in the horizontal plane are staggered.

[0014] Furthermore, the second wind deflector is fixed to the air inlet by a magnetic component, and a scale value is provided on the cabinet door outside the air inlet or on the second wind deflector.

[0015] The motherboard is provided with scale values.

[0016] Furthermore, dustproof cotton is provided at the air inlet of the cabinet door;

[0017] The anemometer fixing fixture is a magnetic adsorption fixture, which can be adsorbed into different positions inside the cabinet corresponding to the designated test points of the transformer, and is used to measure the wind speed at the designated test points of the transformer.

[0018] Furthermore, the bottom of the cabinet is provided with at least two support beams for installing the transformer, and the two ends of the support beams are connected to the bottom crossbeam of the cabinet through support sections.

[0019] Furthermore, one side of the support section is connected to the cabinet via an L-shaped support member. The support member includes a horizontal part and a vertical part. The horizontal part is connected to the bottom plate of the cabinet, and the vertical part is connected to the crossbeam at the bottom of the cabinet. One end of the support member is fixedly connected to the support section.

[0020] The support beam and the support section are integrally formed.

[0021] Furthermore, a crossbeam that can be detachably connected to the cabinet body is provided on the side of the cabinet body near the cabinet door.

[0022] Furthermore, the beam has hooks at both ends, and mounting holes adapted to the hooks are provided on the cabinet for detachably mounting the beam onto the cabinet.

[0023] Furthermore, multiple mounting holes are provided on the crossbeam, the bottom crossbeam of the cabinet, the first support column, and the second support column.

[0024] The advantages of this utility model compared to the prior art are:

[0025] 1. This utility model discloses a transformer temperature rise testing device. It features an independent cabinet structure, housing the transformer within the cabinet. A second baffle plate is installed at the air inlet of the cabinet door, and a first baffle plate is placed between the transformer and a fan. By adjusting the installation positions of the first and second baffle plates and using an anemometer to measure the wind speed at designated test points on the transformer, the device simulates the transformer's actual heat dissipation conditions under real-world operating conditions, testing whether the transformer's temperature rise meets actual operating requirements. It can simulate transformers of different models or manufacturers, offering strong versatility and effectively avoiding the problem of transformer overheating after installation with a universal test power supply, which leads to difficult and costly repairs.

[0026] 2. This utility model discloses a transformer temperature rise testing device. The fan speed is adjusted from coarse to fine, the frequency converter adjusts the overall wind speed, and the second baffle plate and the first baffle plate work together to achieve stepless speed regulation from zero to the maximum level. It can simulate more working conditions and has a wider range of adaptability.

[0027] 3. This utility model discloses a transformer temperature rise testing device with a nested first baffle structure, which allows for convenient and quick wind speed adjustment, and has a simple overall structure and is easy to install.

[0028] 4. This utility model discloses a transformer temperature rise testing device, which designs two first baffles to make the simulated heat dissipation environment inside the cabinet more accurate and facilitates the adjustment of the wind speed at more transformer test points.

[0029] 5. This utility model discloses a transformer temperature rise testing device. Scale values ​​are set on the cabinet door outside the air inlet, or on the second baffle plate and the mother plate, to facilitate recording the setting positions of the second baffle plate and the sub-plate for different transformers. When the same model of transformer needs to be tested later, the installation position can be adjusted directly according to historical data, saving time in setting the second baffle plate and the sub-plate and improving testing efficiency.

[0030] 6. The present invention relates to a transformer temperature rise testing device, which is equipped with dustproof cotton at the air inlet, which can effectively remove dust and prevent impurities from entering the cabinet and affecting the testing results.

[0031] 7. The present invention provides a transformer temperature rise testing device, which has at least two support beams at the bottom of the cabinet and supports the support beams to a certain height through the support section, which is beneficial for heat dissipation at the bottom of the transformer and installation of related circuits.

[0032] 8. The present invention relates to a transformer temperature rise testing device, which connects the support beam, the bottom plate of the cabinet and the crossbeam at the bottom of the cabinet into one unit by setting an L-shaped support on one side of the support section, thereby making the cabinet structure more stable and reducing shaking.

[0033] 9. The present invention relates to a transformer temperature rise testing device, wherein a detachable crossbeam structure is provided on one side of the cabinet door, which can not only make the overall structure more stable, but also provide more installation space for transformer line installation.

[0034] 10. The present invention relates to a transformer temperature rise testing device, wherein multiple mounting holes are provided on the crossbeam, the bottom crossbeam of the cabinet, the first support column, and the second support column, making adjustment more convenient and precise. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a transformer temperature rise testing device of this utility model, with only one side of the cabinet door remaining (including the transformer);

[0036] Figure 2 This is a schematic diagram of the transformer temperature rise testing device of this utility model from another perspective, with only one side of the cabinet door remaining.

[0037] Figure 3 This is a schematic diagram of a transformer temperature rise testing device of this utility model, retaining only the frame and the bottom transformer mounting structure;

[0038] Figure 4 This is a schematic diagram of the first baffle plate structure of a transformer temperature rise testing device according to the present invention;

[0039] Figure 5 This is a schematic diagram of the crossbeam structure of a transformer temperature rise testing device according to this utility model;

[0040] Figure 6 This is a schematic diagram of the designated test points for the transformer in a transformer temperature rise test device according to this utility model.

[0041] The annotations in the attached figures are explained as follows:

[0042] 1. Cabinet body; 101. Cabinet door; 102. First support column; 103. Second support column; 104. Support beam; 105. Support section; 106. Support component; 107. Crossbeam; 1071. Hook section; 2. Fan; 3. First wind deflector; 301. Ventilation hole; 302. Mother plate; 303. Daughter plate; 4. Second wind deflector; 5. Transformer. Detailed Implementation

[0043] To make the objectives, advantages and features of this utility model clearer, the following describes in further detail a transformer temperature rise testing device proposed by this utility model in conjunction with the accompanying drawings and specific embodiments.

[0044] like Figure 1-5 As shown, this utility model addresses the technical problem of abnormal temperature rise in transformers after installation due to the mismatch between the transformer temperature rise testing environment and actual application conditions. It designs a transformer temperature rise testing device, including a cabinet 1, a fan 2, a frequency converter, a first baffle plate 3, a second baffle plate 4, an anemometer fixing fixture, and an anemometer. The fan 2 is located at the top of the cabinet 1 and is connected to a power switch via the frequency converter. The bottom of the cabinet 1 is used to install the transformer 5. Cabinet doors 101 are located on two opposite sides of the cabinet 1, each with an air inlet. Dustproof cotton is installed at the air inlets of the cabinet doors 101. When the fan 2 rotates, it creates a negative pressure environment inside the cabinet. Air enters the cabinet 1 through the air inlets, exchanges heat with the transformer 5 inside the cabinet 1, and is then discharged through the fan 2.

[0045] On the other two opposite sides of the cabinet 1, a first support column 102 and a second support column 103 are respectively provided. A first wind baffle 3 is located between the transformer 5 and the fan 2. The first wind baffle 3 includes a mother plate 302 and a daughter plate 303 nested in the mother plate via a slide rail. Both the mother plate and the daughter plate have ventilation holes 301. The area between any two ventilation holes 301 is the wind-blocking part. The two ends of the mother plate are detachably connected to the first support column 102 and the second support column 103 respectively. By adjusting the relative position of the daughter plate 303 and the mother plate 302, the overlapping area of ​​the ventilation holes 301 of the mother plate 302 and the daughter plate 303 is determined to adjust the wind speed at the designated test point of the transformer 5. In this embodiment, there are two first wind baffles 3, both of which are horizontally arranged. Their two ends are slidably connected to the first support column 102 and the second support column 103 respectively, and can move vertically, moving closer to or away from the fan 2. The projections of the two first wind baffles 3 in the horizontal plane are staggered.

[0046] The second baffle plate 4 is installed at the air inlet of the cabinet door 101. By adjusting the position of the second baffle plate 4 that blocks the air inlet, the wind speed at the designated test point of the transformer 5 can be adjusted. In this embodiment, the second baffle plate 4 is fixed to the air inlet by a magnet, making it easy to disassemble, install, and adjust. Both the second baffle plate 4 and the mother plate 302 are provided with scale values. This facilitates recording the installation positions of the second baffle plate and the daughter plate for different transformers. When it is necessary to test the same type of transformer later, the installation position can be adjusted directly according to historical data, saving the time of setting the second baffle plate and the daughter plate and improving testing efficiency. Scale values ​​can also be set on the cabinet door 101 according to actual needs.

[0047] An anemometer mounting fixture is located inside the cabinet for mounting the anemometer to measure the wind speed at designated test points on the transformer. In this embodiment, the anemometer mounting fixture includes a magnet and a universal connector connected to the magnet. The universal connector is used to hold the anemometer. Using magnetic adsorption, the anemometer can be placed at any position inside the cabinet 1, facilitating the measurement of wind speed environments at different locations on the transformer 5. This provides a more accurate simulation of the actual working environment of the transformer 5. The wind speed test locations can be selected based on specific needs, and can be one or more. This embodiment selects eight test points, such as... Figure 6 Points I, II, III, IV, V, VI, VII, and VIII are shown.

[0048] At least two support beams 104 for installing transformers are provided at the bottom of the cabinet 1. The two ends of the support beams 104 are connected to the bottom crossbeam of the cabinet 1 through support sections 105.

[0049] One side of the support section 105 is connected to the cabinet body via an L-shaped support member 106. The support member 106 includes a horizontal part and a vertical part. The horizontal part is connected to the bottom plate of the cabinet body 1, and the vertical part is connected to the crossbeam at the bottom of the cabinet body 1. One end of the support member 106 is fixedly connected to the support section 105. In this embodiment, the support beam 104 and the support section 105 adopt an integral molding structure.

[0050] Inside the cabinet 1, near the cabinet door 101, there is a crossbeam 107 that can be detachably connected to the cabinet.

[0051] The beam 107 has hooks 1071 at both ends, and mounting holes adapted to the hooks 1071 are provided on the cabinet body for detachably mounting the beam 107 onto the cabinet body 1.

[0052] In this embodiment, multiple mounting holes are provided on the crossbeam, the bottom crossbeam of the cabinet, the first support column, and the second support column. The more mounting holes there are, the higher the adjustment accuracy.

[0053] The working process of this transformer temperature rise testing device is as follows:

[0054] First, determine the eight designated test points for the transformer and measure the wind speed at each point under actual operating conditions. Then, install the transformer 5 into the transformer temperature rise testing device. Place the wind speed probe at any of the eight designated test points, close the cabinet door (for example, if the probe is placed at point I, close the opposite cabinet door and keep its air inlet completely sealed). Next, start fan 2 and adjust its speed using the frequency converter to make the wind speed at point I approach the actual wind speed at that location, ensuring the error does not exceed 5%. Then, adjust the first baffle 3 and the second baffle 4 to ensure the wind speed at point I is essentially consistent with the actual wind speed at that location (i.e., error within ±1%). Use the same method to ensure the wind speeds at points II, III, and IV are also essentially consistent with the actual wind speed at those locations, completing the simulation of the single-sided heat dissipation environment of transformer 5. If the measured temperature rise is appropriate, the transformer is considered reliable.

[0055] Then, the same method was used to test the wind speed at each designated test point on the other side of transformer 5 until the wind speed at all test points was adjusted. Then, transformer 5 was started to conduct the transformer greenhouse test.

[0056] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0057] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

Claims

1. A transformer temperature rise testing device, characterized in that: Includes cabinet (1), fan (2), frequency converter, first wind deflector (3), second wind deflector (4), anemometer fixing fixture and anemometer; The fan (2) is located at the top of the cabinet (1) and is connected to the power switch through the frequency converter. The bottom of the cabinet (1) is used to install the transformer (5). The two opposite sides of the cabinet (1) are respectively provided with cabinet doors (101) and air inlets are provided on the cabinet doors (101). On the other two opposite sides of the cabinet (1), a first support column (102) and a second support column (103) are respectively provided. The first wind baffle (3) is located between the transformer (5) and the fan (2). Its two ends are detachably connected to the first support column (102) and the second support column (103) respectively. The first wind baffle (3) has ventilation holes (301). By moving closer to or away from the fan (2), the wind speed at the designated test point of the transformer (5) can be adjusted. The second wind deflector (4) is set at the air inlet of the cabinet door (101). By adjusting the position of the second wind deflector (4) to block the air inlet, the wind speed at the designated test point of the transformer (5) can be adjusted. The anemometer fixing fixture is located inside the cabinet, on which the anemometer is installed so as to measure the wind speed at the designated test point of the transformer (5).

2. The transformer temperature rise testing device according to claim 1, characterized in that: The first wind deflector (3) includes a mother plate (302) and a daughter plate (303) nested in the mother plate (302) via a slide rail. Ventilation holes (301) are provided on both the mother plate (302) and the daughter plate (303). The area between any two ventilation holes (301) is a wind deflector. The two ends of the mother plate (302) are detachably connected to the first support column (102) and the second support column (103) respectively. By adjusting the relative position of the daughter plate (303) and the mother plate (302), the overlapping area of ​​the ventilation holes (301) of the mother plate (302) and the ventilation holes (301) of the daughter plate (303) is determined, so as to adjust the wind speed at the designated test point of the transformer (5).

3. The transformer temperature rise testing device according to claim 2, characterized in that: There are two first wind deflectors (3), both of which are horizontally arranged. Their two ends are slidably connected to the first support column (102) and the second support column (103) respectively, and can move in the vertical direction, moving closer to or away from the fan (2). The projections of the two first wind deflectors (3) in the horizontal plane are staggered.

4. The transformer temperature rise testing device according to claim 2, characterized in that: The second wind deflector (4) is fixed to the air inlet by magnetic components, and a scale value is provided on the cabinet door (101) on the outside of the air inlet or on the second wind deflector (4). The mother plate (302) is provided with scale values.

5. The transformer temperature rise testing device according to claim 1, characterized in that: The air inlet of the cabinet door (101) is equipped with dustproof cotton; The anemometer fixing fixture is a magnetic adsorption fixture, which can be adsorbed in different positions inside the cabinet (1) corresponding to the designated test points of the transformer (5) to measure the wind speed at the designated test points of the transformer (5).

6. The transformer temperature rise testing device according to claim 1, characterized in that: The bottom of the cabinet (1) is provided with at least two support beams (104) for installing the transformer. The two ends of the support beams (104) are connected to the bottom crossbeam of the cabinet (1) through support sections (105).

7. The transformer temperature rise testing device according to claim 6, characterized in that: One side of the support section (105) is connected to the cabinet (1) via an L-shaped support member (106). The support member (106) includes a horizontal part and a vertical part. The horizontal part is connected to the bottom plate of the cabinet (1), and the vertical part is connected to the crossbeam at the bottom of the cabinet (1). One end of the support member (106) is fixedly connected to the support section (105). The support beam (104) and the support section (105) are integrally formed structures.

8. The transformer temperature rise testing device according to claim 1, characterized in that: Inside the cabinet (1), near the cabinet door (101), there is a crossbeam (107) that can be detachably connected to the cabinet.

9. The transformer temperature rise testing device according to claim 8, characterized in that: The beam (107) has hooks (1071) at both ends, and the cabinet has mounting holes that fit the hooks (1071) for detachably mounting the beam (107) onto the cabinet (1).

10. The transformer temperature rise testing device according to claim 8, characterized in that: Multiple mounting holes are provided on the crossbeam (107), the bottom crossbeam of the cabinet (1), the first support column (102), and the second support column (103).

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