Measurement of noise associated with model transformer cores

Snell, D.

doi:10.1016/j.jmmm.2008.04.143

Cited by 26 publications

(7 citation statements)

References 1 publication

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“…Environmental regulations demand that the noise generated by a transformer core is minimised. A recent paper [1] has discussed a system suitable for evaluation of noise associated with three phase transformer core configurations, the effects of clamping and the number of laminations per step on transformer noise. This paper discusses the results of noise measurements obtained for step lap cores comprising 3, 5, or 7 step laps with 2, 4, or 6 mm step overlaps.…”

Section: Introductionmentioning

confidence: 99%

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Noise generated by model step lap core configurations of grain oriented electrical steel

Snell¹

2008

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 99%

“…2. A sound booth was positioned around the core to eliminate background noise as far as possible [1].…”

Section: Introductionmentioning

confidence: 99%

Noise generated by model step lap core configurations of grain oriented electrical steel

Snell¹

2008

Journal of Magnetism and Magnetic Materials

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“…Three novel non-dimensional geometrical parameters which are nominated HPR (Height to Pan Ratio), HBR (Height to Bore Ratio), and HTR (Height to Thickness Ratio) in this study are defined according to Eqs. (3)(4)(5). Using these values one can estimate the dimensions where mean noise level of the transformer may become minimum or maximum.…”

Section: Experimental Test-rig For Measurementmentioning

confidence: 99%

“…In addition, other parameters such as noise insulators, rubber dampers, and clamping force of the core may be the effective parameters on the overall noise level of the transformer. Snell [3] has used an experimental setup to evaluate the noise level of a step lap transformer according to the IEC60651 criteria. Due to the experimental results the choice of noise insulators between core and ground support and optimum clamping force are vital parameters for minimization of noise level.…”

Section: Introductionmentioning

confidence: 99%

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

Soltanmohammadi¹,

Monfare²

2019

Sound&Vibration

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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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“…This was further opined by many researchers working on the characterisation of magnetostriction in the past decade. In Reference 11, it was established that the nature of harmonics proved to be decisive in the generation of noise. In Reference 12, an experimental frequency characterisation of the phenomenon of magnetostriction was done for reducing the source of error.…”

Section: Introductionmentioning

confidence: 99%

Investigation on magnetostrictive behaviour of a converter transformer influenced by dominant harmonics: AFEMandANNbased approach

Yadav

Mehta

2021

Int Trans Electr Energ Syst

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Summary The introduction of harmonics to the HVDC system is imminent, which affects the components of the power system from varied perspectives. The present work emphasises analysing the behaviour of the converter transformer concerning the harmonics in the input. The process involves designing a stepped configuration of a 240‐MVA converter transformer using the finite element method (FEM). The designed model is analysed as per its structural dynamics to obtain its vibrational response for different ranges over the frequency spectrum. Furthermore, the module of acoustics and thermal analysis is coupled to the vibrational model. The coupled model serves as an efficient tool in analysing the impact of different orders of harmonics on the vibrational, acoustic and thermal performance of the core of the converter transformer. The computational effort taken in solving the coupled field problem is simplified by designing a neural network model and the prediction efficacy of the network is enhanced by using a Hybrid of Particle Swarm Optimisation and Gravitational Search Algorithm (HPSOGWO) as tuner of the internal parameters of the neural network. The significance of the designed model is also examined against other well‐versed hybrid algorithms in the literature in terms of various statistical indices.

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Measurement of noise associated with model transformer cores

Cited by 26 publications

References 1 publication

Noise generated by model step lap core configurations of grain oriented electrical steel

Noise generated by model step lap core configurations of grain oriented electrical steel

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

Investigation on magnetostrictive behaviour of a converter transformer influenced by dominant harmonics: AFEMandANNbased approach

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