Abstract
High voltage devices such as dry-type air-core reactors are subjected to environmental noise standards. Their excitation is due to Lorentz forces originated from the magnetic field, created by the coil itself, combined with the feed current. The objective of this paper is to show how spectral components present in the supply current of industrial dry-type air-core reactors is likely to produce a significant acoustic radiation. First, the multi-component distribution of the Lorentz forces is established. Then, the multi-physics computation process allowing to determine the acoustic pressure induced by each force component is presented. Finally, two industrial reactors are studied: a single and a multi-layer coil. It is pointed out that significant acoustic emergence can be induced by the interaction between small current spectral components with the fundamental or with each other.
Highlights
Dry-type air-core reactors used in electric grids can be source of noise pollution for neighborhood
These industrial reactors serve at limiting the fault currents, compensating the loads between two spectral components in parallel or filtering harmonics
The contribution of the other modes such as radial bending modes are noticeable and tends to be generally more significant when they get closer to the frequency of mode (0,0). 4.3 Sound radiation for multi-components current supply we focus on the spectral components that are close to structural modes, so that they can induce a structural resonance producing a significant acoustic level
Summary
Dry-type air-core reactors used in electric grids can be source of noise pollution for neighborhood. The noise originates from the interaction of the electric current and the induced electromagnetic field, that produces periodic Lorentz forces exciting the structure [1]. These industrial reactors serve at limiting the fault currents, compensating the loads between two spectral components in parallel or filtering harmonics. The results obtained for a single layer air-core reactor are successfully compared with tests These models are subject to hypotheses, like uniform magnetic field distribution, that do not allow accurate modeling of multi-layer reactors. Gning [1] proposes a multi-physic model, coupling several numerical codes, to compute the sound radiation of a single-layer air-core coil fed by a purely sinusoidal current. The sound radiation of two industrial air-core reactors, a single and a multi-layer, fed with such multi-components current is analyzed
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