What Determines a Transformer Noise Level?
Quick answer — Transformer noise is dominated by the magnetostriction of the core (the core vibrates with each magnetisation cycle) plus the noise from the cooling fans and pumps. The sound level depends on the flux density, core material, construction, load and cooling, and is reduced by using lower-loss/amorphous core, higher-grade steel, better clamping and acoustic enclosures. Standards specify a maximum noise level.
What causes transformer noise and how is it reduced?
Sources of noise
Core magnetostriction is the main source at about 100-120 Hz and its harmonics; the cooling fans and oil pumps add broadband and tonal noise.
How it is reduced
Use a lower magnetostriction core material, run at lower flux density, use better core and tank construction, and add sound enclosures or barriers near the site.
Standards and rating
IEC 60076-10 sets sound-level tests. Transformers are rated for the connected network and local noise limits, so a noise-level limit is often specified.
References & standards
- IEC 60076-10 (sound level)
- IEEE C57.12.90
Related
Related manufacturers
Prolec GE (GE Vernova) · Prolec GE Waukesha · Hitachi Energy USA · Siemens Energy · Eaton · Virginia Transformer Corp
Related components
Technical content is prepared from engineering references, standards frameworks, manufacturer documentation and industry sources. Contractual or compliance decisions should refer to current official standards. TransformerPath Technical Editorial.
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