Open Access
ARTICLE
Experimental and Numerical Study of the Key Non-Dimensional Geometrical Parameters on the Noise Level of Dry-Type Cast Resin Transformers
Mahdi Soltanmohammadi1, Vahid Monfared2,*
1 Department of Technical Office, Iran Transfo Co., Zanjan, Iran
2 Young Researchers and Elite Club, Zanjan Branch, Islamic Azad University, Zanjan, Iran
* Corresponding Author: Vahid Monfared. Email: .
Sound & Vibration 2019, 53(5), 177-198. https://doi.org/10.32604/sv.2019.05811
Abstract
Dry-Type Cast Resin Distribution Transformers (CRT) is the secondgeneration
of air-cooled distribution transformers where oil is replaced by resin
for electrical insulation. CRT transformers may installed indoor adjacent to or
near residential areas since they are clean and safe comparing to the conventional
transformers. But, as it is obvious, noise discrepancy is intrinsically accompanied
with all types of transformers and is inevitable for CRT transformers too. Minimization
of noise level caused by such these transformers has biological and ergonomic
importance. As it is known the core of transformers is the main source of
the noise generation. In this paper, experimental and numerical investigation is
implemented for a large number of fabricated CRT transformers in IT Co (Iran
Transfo Company) to evaluate the effective geometrical parameters of the core
on the overall sound level of transformers. Noise Level of each sample is measured
according to criteria of IEC60651 and is reported in units of Decibel
(dB). Numerical simulation is done using noncommercial version of ANSYS
Workbench software to extract first six natural frequencies and mode shapes of
CRT cores which is reported in units of Hz. Three novel non-dimensional variables
for geometry of the transformer core are introduced. Both experimental
and numerical results show approximately similar response to these variables.
Correlation between natural frequencies and noise level is evaluated statistically.
Pearson factor shows that there is a robust conjunction between first two natural
frequencies and noise level of CRTs. Results show that noise level decreases as
the two first natural frequencies increases and vice versa, noise level increases
as the two natural frequencies of the core decreases. Finally the noise level
decomposed to two parts.
Keywords
Cite This Article
Soltanmohammadi, M., Monfared, V. (2019). Experimental and Numerical Study of the Key Non-Dimensional Geometrical Parameters on the Noise Level of Dry-Type Cast Resin Transformers.
Sound & Vibration, 53(5), 177–198. https://doi.org/10.32604/sv.2019.05811