Dry-type transformers will generate certain noise during operation. The noise mainly comes from the magnetostriction of the core, the vibration of the windings, and the fan noise of the cooling system. Excessive noise not only affects the working environment, but may also cause damage to the equipment itself. Therefore, noise control is an important link in the design and manufacture of dry-type transformers.
Noise source analysis
1. Core noise:
The core will undergo magnetostriction under the action of the alternating magnetic field, causing the core to vibrate and generate noise. Looseness or improper assembly between the core laminations will also aggravate the noise.
2. Winding noise:
The winding will vibrate under the action of electromagnetic force, especially when a large current passes through. The unsoundness of the winding or the aging of the insulation material will increase the noise.
3. Cooling system noise:
Dry-type transformers usually use an air cooling system, and the operation of the fan will generate noise. Irrational design or improper installation of the fan will further increase the noise.
4. Structural resonance:
The transformer shell or internal structure may resonate at a certain frequency, amplifying the noise.
Methods for reducing noise of dry-type transformers
1. Optimize transformer structure
By optimizing the structure of the transformer and reducing the vibration of the core and winding, the noise of the transformer can be effectively reduced. For example, adopting new core materials and winding structures can increase the mechanical strength of the transformer and reduce the noise generated by vibration.
2. Reduce fan noise
The fan is one of the important auxiliary equipment of the dry-type transformer, but its noise is also one of the main sources of transformer noise. Therefore, reducing fan noise is one of the important measures for reducing noise of dry-type transformers. Fan noise can be reduced by optimizing fan design, improving fan efficiency, and reducing fan speed.
3. Soundproofing measures
Setting up soundproof walls or soundproof covers around the transformer can effectively isolate the noise generated by the transformer and reduce the impact of noise on the surrounding environment. In addition, silencers can be installed at the air inlet and outlet of the transformer to further reduce the spread of noise.
4. Control the operating environment of the transformer
The operating environment of the transformer will also affect its noise. Therefore, controlling the operating environment of the transformer is also one of the important measures to reduce noise. For example, keeping the transformer room clean, reducing indoor temperature and humidity fluctuations, and avoiding outdoor noise interference can effectively reduce the noise of the transformer.
5. Vibration reduction measures
Adding rubber pads, shock-absorbing materials, etc. to the base and shell of the transformer can effectively reduce the transmission of vibration and thus reduce noise. For example, using a vibration-reducing pedestal or a special dry-type transformer shock absorber can control the transmission of vibration at a low level. For busbars and grounding plates, soft connections can be used instead of hard connections to reduce the transmission of vibration and noise.
The research and application of dry-type transformer noise reduction technology is of great significance to reducing environmental pollution and improving peoples quality of life. In the future, with the continuous advancement of science and technology and the development of the power industry, dry-type transformer noise reduction technology will be more widely used and promoted.
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