The transformer is one of two installed as part of a recent project, and is appreciably louder than the other transformer on the project. fundamental noise frequency. The amount of noise is generally fixed by the design of the transformer. I am seeking information on the normal noise levels of transformers in the 50MVA range. Adjustments to a design to reduce the noise level can be made at cost, but don't expect a huge reduction in the noise level. Vibration-isolating core and coils within a tank does assist vibration isolation although isolation of the whole tank is still needed. 3.2 Characteristics of distribution transformer noise Distribution transformers are relatively small both in size and in sound power output. Transformer noise is produced by the core. If the green highlighted distances can be achieved, the transformer is deemed to comply. NEMA TR 1 is one of the few standards on the market that lists audible sound levels for these particular transformers. The result is the transformer noise level. exchange it, the transformer core laminations are not tight which if this is brand new, its defective. It is always necessary to measure the Placing transformers in liquid (oil) does not help since oils are incompressible. RE: Transformer Noise Levels bacon4life (Electrical) 10 Sep 07 19:09. Transformer current loading has little or no effect on the noise level. The sound power level of a transformer depends on its power rating, the type and the year it was produced. To measure amounts of noise in each frequency range you need a frequency analyzer. The noise level is measured basically two methods, sound pressure measurement and sound intensity measurement. Step-voltage regulators have been added to the scope in this edition and there is now more alignment with IEEE transformer standards. Transformer Noise Levels Rodmcm (Electrical) (OP) 10 Sep 07 18:09. Wherever the transformer noise is located you can shift the enclosure to a new location to help reduce sound levels. While it takes a crew and sound construction expertise to dismantle, move, and reset the enclosure, these panels are movable unlike stone, cement, and brick walls. NOTE For the purpose of this standard, the term "transformer" means "transformer or reactor". transformer within which it could be expected that noise from the transformer will exceed the assigned levels in the Noise Regulations. When I measure the sound pressure level of the room with the 'noisy' transformer I obtain a 70dBA reading. This is a worthwhile acquisi-tion. The methods are applicable to transformers and reactors covered by the IEC 60076 series, Table 3: Separation distances and fences Transformer Rating Fence height above transformer (mm) Number of fenced sides https://transformers-magazine.com/magazine/transformer-noise And it is brand new compressor unit. Loading a transformer has little effect on the noise level. NEMA TR-1 lists typical values of 75 dB to 80 dB. If the transformer is located in an area with a lot of traffic, people will find the noise irritating, especially if ambient noise is lower than the unit’s sound level. Understanding Transformer Noise Transformer Noise intervals along the imaginary string. Make sure there’s at least one low-traffic space between the transformer and high-traffic areas in offices, residential buildings, etc. The measurements are totaled and then averaged. NEMA TR 1-2013 may be downloaded at no cost or purchased in hardcopy for $55 on the NEMA website. I'm wondering 'how much' noise is normal that power transformers should emit from the unit itself? When I measure the sound level of the room with the other transformer, I obtain a reading of 70dBA also. Noise level measurements of Transformers A noise level is commonly measured in decibels (dB) by comparing the pressure generated by a noise source with some standard level. I know that I have a sensitive ears, but this one I can hear from above 3 meters. Does anyone have references for this? which sound power levels of transformers, reactors and their associated cooling auxiliaries may be determined.