Transformer vibration control system

Abstract

The application discloses a transformer vibration control system, which comprises a vibration isolation module, a supporting installation component, a connecting jacking component, a damping shock absorber, a flexible connecting copper bar and a flexible grounding wire. The supporting installation component is arranged at the end of the supporting base under the transformer channel steel, four vibration isolation modules are arranged between the supporting installation component and the ground floor, the connecting jacking component is arranged between the positioning nut of the vibration isolation module and the mounting round hole of the supporting installation component, two vibration isolation modules are arranged below the middle part of the transformer channel steel, the connecting jacking component is arranged between the positioning nut of the vibration isolation module and the positioning ring at the bottom of the transformer channel steel, the damping shock absorber is arranged on the transformer channel steel, and the inlet and outlet copper bars of the transformer are replaced by the flexible connecting copper bars.

Description

Technical Field

[0001] This invention relates to a vibration and noise control technology, particularly a transformer vibration control system. Background Technology

[0002] The electromagnetic noise of a transformer is caused by the magnetostrictive vibration of its core under the influence of an electromagnetic field. The frequency of this magnetostrictive change in the transformer core is the same as the frequency of the AC power supply. Because the toroidal core of the transformer is excited by the electromagnetic fields of two sets of coils, its magnetostrictive frequency is twice the power supply frequency. Since the frequency of my country's power grid is 50Hz, the fundamental frequency of the transformer vibration noise is 100Hz. In addition to the fundamental frequency, the electromagnetic noise of a transformer also includes higher harmonic noise components. Generally, larger transformers have lower loudest harmonic frequencies, while smaller transformers have higher loudest harmonic frequencies. The noise level of a transformer is related to the input voltage. During the day, the input voltage is lower and the load is smaller, so the transformer core is less dense, resulting in softer noise with a lower level. At night, the input voltage is higher and the load is larger, leading to higher indoor noise in the distribution room compared to the daytime.

[0003] When the transformer is running, vibrations are transmitted through the steel base to the floor of the machine room, causing vibrations throughout the entire foundation. Solid-borne sound waves, generated on the concrete floor, spread outwards. Upon encountering the walls, these waves propagate further into the walls. Because the concrete floor and walls are rigidly connected at right angles, the solid-borne sound waves undergo waveform transformation, resulting in reflection and transmission loss. When solid-borne sound travels upwards from the first-floor walls, at the T-shaped junction with the floor slab, the sound energy enters both the floor slab and the second-floor walls, causing further sound energy loss. Each change in the shape of the propagation medium leads to waveform transformation, resulting in a certain proportion of transmission loss. When sound waves propagate upwards along the walls, if the walls are of uniform thickness and made of homogeneous concrete, the sound wave loss with distance is relatively small, potentially affecting the acoustic environment of the entire building. If the solid-borne sound waves resonate with the natural frequency of a building component, the resulting vibration energy will be several times that of the transformer.

[0004] The transformer's input and output cables are connected to the roof slab of the machine room via cable trays and hooks. Although the vibration of the cable trays is much smaller than that of the transformer base, the solid-structure sound acts directly on the second-floor floor due to the direct connection to the second-floor slab via hooks. As a result, the operating noise of the transformer can be clearly heard inside the second-floor machine room. Summary of the Invention

[0005] In response to the noise characteristics of power distribution equipment, a high-efficiency low-frequency vibration isolation structure has been developed, which can effectively reduce the impact of low-frequency noise from power distribution equipment on residential areas. The use of non-stop vibration isolation module technology greatly reduces the implementation cost of transformer vibration isolation and noise reduction and shortens the construction period.

[0006] The technical solution adopted by this invention to solve its technical problem is: a transformer vibration control system, including vibration isolation modules and upper positioning nuts, support mounting components, connecting lifting components, damping vibration dampers, flexible connecting copper busbars, and flexible grounding wires. The support mounting components are located at the end of the support base under the transformer channel steel; four vibration isolation modules are located between the support mounting components and the ground; the connecting lifting components are located between the positioning nuts and the mounting holes of the support mounting components; two vibration isolation modules are located below the middle of the transformer channel steel; the connecting lifting components are located between the positioning nuts and the positioning rings at the bottom of the transformer channel steel; the damping vibration dampers are located on the transformer channel steel; and the transformer's inlet and outlet copper busbars are replaced with flexible connecting copper busbars. By replacing the copper busbars with flexible connecting copper busbars, the transmission of transformer operating vibrations to the cable trays and the second-floor slab through the connecting copper busbars is prevented.

[0007] The connecting lifting component includes a screw, an adjusting nut, and a fastening nut. The positioning ring at the bottom of the transformer channel steel can be a nut with an inner diameter larger than the outer diameter of the connecting lifting component screw.

[0008] By rotating the adjusting nuts of the lifting components, the support base and transformer channel steel are evenly lifted, transferring the load borne by the transformer channel steel to the vibration isolation modules. This separates the support base from the ground by approximately 3mm, and the distance between the support base and the ground is fixed by tightening the nuts. By evenly distributing the vibration isolation modules under the transformer channel steel, the rigidity of the transformer support base and the even lifting are ensured, achieving vibration isolation retrofitting of the transformer without disassembling the unit.

[0009] The load center of the multiple vibration isolation modules coincides with the load center of the transformer. The damping vibration damper is composed of a closed shell with built-in non-metallic particles, and is installed on the transformer channel steel, with a mass of 5% of the transformer load.

[0010] The use of particle damping energy dissipation technology, also known as impact damping structure, primarily reduces system vibration by filling a confined, enclosed space with solid particles. This is achieved through kinetic energy exchange and dissipation caused by friction and collisions between the particles and the main structure. A good linear relationship exists between relative vibration isolation and noise reduction and the natural frequency efficiency of the isolation element; however, the vibration reduction effect of the damping structure is non-linear in most cases. The vibration reduction effect of the damping structure is closely related to the excitation conditions at its location; the damping force depends to some extent on the excitation conditions, and the higher the relative velocity of the vibration, the better the damping effect. Placing damping dampers on transformer channel steel can effectively absorb the vibration energy passing through the transformer channel steel. Due to their miniaturization, the vibration isolation module may have insufficient mass, affecting the improvement of vibration isolation efficiency. The accompanying particle damping vibration isolation module provides additional mass to the vibration isolation module system, further increasing the mass ratio of the system, reducing amplitude and the system's center of gravity, and improving vibration isolation efficiency.

[0011] The beneficial effects of this invention are: it can effectively block the transmission of low-frequency solid-structure sound during transformer operation, preventing residents inside buildings from being harmed by vibration waves, especially avoiding the impact on residents' rest at night. The use of non-stop vibration isolation module technology greatly reduces the implementation cost and construction period of transformer vibration isolation and noise reduction. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a top view of the transformer foundation base.

[0014] Figure 2 This is a front view of the transformer foundation.

[0015] In the diagram: 1. Vibration isolation module, 11. Positioning nut, 2. Support mounting component, 21. Mounting hole, 3. Connecting lifting component, 31. Screw, 32. Adjusting nut, 33. Fastening nut, 4. Damping vibration damper, 5. Transformer, 51. Channel steel, 52. Positioning ring, 53. Support base, 6. Ground. Detailed Implementation

[0016] exist Figure 1 , 2In the illustrated embodiment, a transformer vibration control system includes a vibration isolation module (1), an upper positioning nut (11), a support mounting component (2), a connecting lifting component (3), a damping damper (4), and a flexible connecting copper busbar (5). The support mounting component (2) is located at the end of the support base (53) under the channel steel (51) of the transformer (5). Four vibration isolation modules (1) are located between the support mounting component (2) and the ground (6). The connecting lifting component (3) is located between the positioning nut (11) and the mounting hole (21) of the support mounting component (2). When the end of the support base (52) does not have the installation conditions, a crossbeam can be set on the support base (52), and vibration isolation modules (1) can be installed at both ends of the crossbeam, or vibration isolation modules (1) can be installed under both ends of the transformer channel steel (5). Two vibration isolation modules (1) are set below the middle of the transformer channel steel (5), and the connecting lifting component (3) is set between the positioning nut (11) and the positioning ring (52) at the bottom of the transformer (5) channel steel (51); the damping damper (4) is set on the transformer (5) channel steel (51), and the inlet and outlet copper busbars of the transformer (5) are replaced with flexible connecting copper busbars.

[0017] The connecting lifting component (3) includes a screw (31), an adjusting nut (32), and a fastening nut (33). The positioning ring (52) at the bottom of the channel steel (51) of the transformer (5) can be a nut with an inner diameter larger than the outer diameter of the screw (31) of the connecting lifting component (3).

[0018] By rotating the adjusting nut (32) of the lifting component (3), the support base (53) and the transformer (5) channel steel (51) are lifted evenly, and the load borne by the transformer (5) channel steel (51) is transferred to the vibration isolation module (1), so that the support base (53) is separated from the ground by about 3mm, and the distance between the support base (53) and the ground is fixed by tightening the nut (33).

[0019] The load center of the multiple vibration isolation modules (1) is consistent with the load center of the transformer (5). The damping vibration damper (4) is composed of a closed shell with built-in non-metallic particles, which is evenly arranged on the channel steel (51) of the transformer (5), and its mass is 5% of the transformer load.

[0020] It should be understood that various changes can be made to the above embodiments without departing from the scope of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention fall within the protection scope of the present invention.

Claims

1. A transformer vibration control system, comprising a vibration isolation module and an upper positioning nut, a support mounting component, a connecting lifting component, a damping vibration absorber, a flexible connecting copper busbar, and a flexible grounding wire, characterized in that: The aforementioned support mounting component is located at the end of the support base under the transformer channel steel. Four vibration isolation modules are located between the support mounting component and the ground. The connecting lifting component is located between the positioning nut and the mounting hole of the support mounting component. Two vibration isolation modules are located below the middle of the transformer channel steel. The connecting lifting component is located between the positioning nut and the positioning ring at the bottom of the transformer channel steel. The damping vibration damper is located on the transformer channel steel. The transformer's inlet and outlet copper busbars are replaced with flexible connecting copper busbars.

2. The transformer vibration control system according to claim 1, characterized in that: The connecting lifting component includes a screw, an adjusting nut, and a fastening nut.

3. The transformer vibration control system according to claims 1 and 2, characterized in that: The positioning ring at the bottom of the transformer channel steel can be a nut with an inner diameter larger than the outer diameter of the connecting lifting component screw.

4. The transformer vibration control system according to claims 1 and 2, characterized in that: By rotating the adjusting nut of the lifting component, the support base and transformer channel steel are lifted evenly, and the load borne by the transformer channel steel is transferred to the vibration isolation module, so that the support base is separated from the ground by about 3mm. The distance between the support base and the ground is fixed by tightening the nut.

5. The transformer vibration control system according to claim 1, characterized in that: The load center of the multiple vibration isolation modules is consistent with the load center of the transformer.

6. The transformer vibration control system according to claim 1, characterized in that: The damping vibration damper is composed of a closed shell with built-in non-metallic particles. The damping vibration damper is installed on the transformer channel steel and its mass is 5% of the transformer load.

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