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Axial Noise Control Phenomenology

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© 1998-2009 - IAV Engineering - Noise & Vibration Engineering

Ch. des Couleuvres 4A, 1295 Tannay (Switzerland)

Phone: +41 (0)22 960 11 04 - Fax: +41 (0)22 960 11 06

Email: iav@iav.ch - Website: www.iav.ch

Worldwide, thousands of electrical plants are equipped with power transformers. Growing urbanization and regulations enforcement make transformers with still decades of lifetime become predominant noise sources of their changing environment.

For electrical companies, noise assessment and compliance of their new and existing installations becomes a main priority. While assessing the noise of an electrical plant already requires delicate noise monitoring, controlling the nearby noise imission is also well-known as a tricky issue: even not regarding at thermical or other high-voltage electrical contingencies, the specific intrinsic long wavelength tonal noise of transformers has the ability to come through concrete walls. On the other hand, for the same reason that the noise is tonal, for about two decades now the attractive solutions of active noise control of transformers have been investigated with high expectations. But two particular facts won’t go away: most electrical plants use several transformers as constituting as much as independent noise sources and the nearby acoustic radiation patterns complexity of transformers degenerates strongly with increasing size. On the other hand, a review of hundreds noise situation typology showed that in most cases the tonal noise excess were effective in the lower frequencies of 100, 200 and 300 Hz and for selective directions around the plant.

The modular LINOV Technology comes as the most rational answer to this need. At the first level of use a full autonomous deployable noise monitoring system able to assess long-term the noise situation in the concerned directions around the plant and display online all relevant information to concerned people. At the second level of use a cost-effective axial active noise control system able to deal with the number of transformers involved in the noise situation of the electrical plant.