Experimental and Numerical Study of the Key Non-Dimensional Geometrical Parameters on the Noise Level of Dry-Type Cast Resin Transformers

IF 0.9 Q4 ACOUSTICS Sound and Vibration Pub Date : 2019-01-01 DOI:10.32604/sv.2019.05811
Mahdi Soltanmohammadi, Vahid Monfare
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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.
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干式铸造树脂变压器关键无量纲几何参数对噪声影响的实验与数值研究
干式铸造树脂配电变压器(CRT)是第二代风冷配电变压器,用树脂代替油进行电气绝缘。CRT变压器可安装在室内,邻近或靠近住宅区,因为与传统变压器相比,它们更清洁和安全。但是,很明显,噪声差异本质上伴随着各种类型的变压器,对于CRT变压器来说也是不可避免的。将这些变压器引起的噪音降到最低具有生物学和人体工程学的重要性。众所周知,变压器铁芯是产生噪声的主要来源。本文对伊朗IT公司制造的大量CRT变压器进行了实验和数值研究,以评价铁芯几何参数对变压器整体声级的影响。根据IEC60651标准测量每个样品的噪声级,并以分贝(dB)为单位报告。利用非商业版的ANSYS Workbench软件进行数值模拟,提取了以Hz为单位的CRT核的前六个固有频率和模态振型。介绍了变压器铁心几何形状的三个新的无量纲变量。实验和数值结果表明,对这些变量的响应近似相似。对固有频率与噪声级之间的相关性进行了统计评估。皮尔逊因子表明,在crt的前两个固有频率和噪声水平之间存在稳健的联系。结果表明,随着两个前固有频率的增加,噪声水平降低;反之,随着两个核心固有频率的降低,噪声水平增加。最后将噪声级分解为两部分。
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来源期刊
Sound and Vibration
Sound and Vibration 物理-工程:机械
CiteScore
1.50
自引率
33.30%
发文量
33
审稿时长
>12 weeks
期刊介绍: Sound & Vibration is a journal intended for individuals with broad-based interests in noise and vibration, dynamic measurements, structural analysis, computer-aided engineering, machinery reliability, and dynamic testing. The journal strives to publish referred papers reflecting the interests of research and practical engineering on any aspects of sound and vibration. Of particular interest are papers that report analytical, numerical and experimental methods of more relevance to practical applications. Papers are sought that contribute to the following general topics: -broad-based interests in noise and vibration- dynamic measurements- structural analysis- computer-aided engineering- machinery reliability- dynamic testing
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