go to the Power transformers product page Anonymous asked on Dec 30th, 2013 in Power transformers

Can the noise level of ABB transformer be lower than the NEMA noise standard? Can we say that in the lab, commonly used ABB transformers are x% below the NEMA noise level standard?

Abhishek Rai, Marketing and Sales Manager

ABB's answer

Noise level can be below NEMA for various reasons (A & B evaluation factors, higher grade electrical steel as examples). In general, there is no way to determine the percentage of units that are below without actual test results. Typically, ABB transformers have much lower noise levels than NEMA. The NEMA levels were based on the performance of transformers that had cores made with regular grain oriented steels, operating at high flux density, and having non step lap core joints. Because noise levels required by local and state noise ordinances are now much lower than ever before, we design these transformers using highly grain oriented steels, at lower flux densities, and with step lap joints resulting in 10 - 20 lower noise levels than the NEMA TR1 table levels. How much lower is determined by what customers require based on where the transformers will be located.


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  • Abhishek Rai

    Abhishek Rai

    Marketing and Sales Manager

    Large and medium power transformers

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