Contents
How can you reduce the noise of a transformer?
Use Acoustical Dampening Material You can reduce some of the noise generated by an electrical transformer by using materials that prevent the sound from spreading. Covering the walls of the transformer room with absorbent materials such as kimsul, acoustical tile or fiberglass may help keep the noise contained.
What is the main cause of noise in transformer?
Transformer noise is caused by a phenomenon called magnetostriction. In very simple terms this means that if a piece of magnetic sheet steel is magnetized it will extend itself. When the magnetization is taken away, it goes back to its original condition. This is called the fundamental noise frequency.
How can transformers reduce magnetostriction?
How Can You Reduce Transformer Noise?
- Mounting the transformer on a solid plane.
- Avoiding installing transformers in corners, corridors, and stairwells.
- Choosing a low traffic area for installation.
- Keeping the bolts enclosures tight.
- Using sound dampening materials.
What are the causes of noise and vibration in transformer?
Transformer vibration (and consequently noise) is caused by the magnetostriction of the core laminates (the extension and contraction of the core laminates when magnetized). In air cooled dry transformers this means to isolate the core and coil from its support structure.
What sound does a transformer make?
Where Does the Sound Come From? Noise is caused by magnetostricition (changes in shape) of the core laminations while the transformer is energized. Transformers emit a low-frequency, tonal noise that people living in their vicinity experience as an irritating “hum” and can hear even against a noisy background.
Do transformers create noise?
We have established that the core and coils of a transformer will, when magnetized, produce a hum (noise) and mechanical vibrations, but, the transformer category will also have an effect on what happens once the noise and vibration is produced.
What is a Class B transformer?
The insulation system is the highest internal temperature a transformer can withstand. Previously, insulation rating was denoted by letter system. This has changed to actual temperature rating (Class A = Class 05°C, Class B = Class 150°C, Class F = Class 180°C, and Class H = Class 220°C).
Are there any noise reduction techniques for Transformers?
The noise reduction techniques can be summarized as below: • Reduction in core flux density: This gives noise reduction of 3 to 5 dB for a reduction in flux density by 10% or approximately 2 dB per flux density reduction of 0.1 T. The method has adverse effects on the cost and size of transformers.
What causes the noise in an electrical transformer?
The principal sources of transformer noise, the magnetic core influence to control the noise of the equipment are discussed. The primary source of acoustic noise generation in a transformer is the periodic mechanical deformation of the transformer core and the winding coils.
Which is a technique for noise level reduction?
Active noise control is one more technique for the noise level reduction, in which an anti-phase noise is generated and superimposed on the noise emitted by the transformer. It requires very sophisticated instrumentation and computational facilities.
How is sound level analysis used in Transformers?
The methods are applicable to transformers, reactors and their cooling devices also. Sound pressure level is a scalar quantity and requires simple instrumentation. Sound intensity is a vector quantity and the method measures directional sound. It is, therefore, less affected by a background noise.