Abstract
We propose load noise analysis components for small core-form transformers (1 MVA–20 MVA) using computational fluid-structure coupled calculations that consider the electromagnetic force, transformer structure and fluid (oil). The proposed technique has two beneficial aspects: coil modeling using shell elements of the finite element method (FEM), and acoustic noise analysis using a combination of boundary element method transmission path simulation and FEM structural simulation. The shell element model, which includes structural bending information, is less computationally intensive for simulations than solid models because it uses larger element sizes. Lighter simulations enable easier redesign for noise reduction. Additionally, division of the simulation process into individual structural vibrations, transmission paths, and radiation processes makes it easier to find a remodeling point without performing a complete simulation. We illustrate the importance of avoiding coincidence of the natural frequencies of the coils and the electromagnetic force and present a practical noise reduction study. This technique can be implemented using a light simulation that was proposed to confirm the remodeling effects. Using the proposed analysis method along with a ray tracing method, we can construct a frontloading design simulation tool to determine the transformer specifications and the substation's geographical features.
Highlights
F ROM the environmental impact viewpoint, the demand for low noise transformers has been increasing
In [11], the electromagnetic vibrations of the coils were analyzed using a 3D solid finite element method (FEM) model. This solid model made it possible for the analysis to simulate the vertical and radial directional vibrations, and requires high computing power, so it is unsuitable for use for regular routine works of small core-form transformers
In [12] and [13], the cores, the winding coils, the insulation oil, and the tank were analyzed using a 3D solid FEM model, so a huge number of model elements would have to be calculated for regular routine works of small core-form transformers
Summary
F ROM the environmental impact viewpoint, the demand for low noise transformers has been increasing. In [11], the electromagnetic vibrations of the coils were analyzed using a 3D solid finite element method (FEM) model This solid model made it possible for the analysis to simulate the vertical and radial directional vibrations, and requires high computing power, so it is unsuitable for use for regular routine works of small core-form transformers. In [12] and [13], the cores, the winding coils, the insulation oil, and the tank were analyzed using a 3D solid FEM model, so a huge number of model elements would have to be calculated for regular routine works of small core-form transformers. We proposed to model the coils using an FEM shell model to enable analysis of the electromagnetic noise characteristics of the small core-form transformer, from which substations are often constructed near residential areas, with minimal simulation times [10]. We show the noise propagation to the site boundary line, which is the focus of the environmental impact analysis
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