Title:
TRANSFORMER NOISE PERFORMANCE DIAGNOSIS METHOD AND NOISE REDUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2023/276495
Kind Code:
A1
Abstract:
This transformer noise performance diagnosis method includes: a step for acquiring, in a transformer having a laminated iron core 21 obtained by laminating electromagnetic steel sheets, a noise frequency spectrum of the laminated iron core 21; a step for determining a modulus of transverse elasticity at two surfaces including the lamination direction of the laminated iron core 21 in order to calculate excitation vibration of the laminated iron core 21; a step for acquiring an excitation vibration frequency spectrum of the laminated iron core 21 by executing calculation of the excitation vibration of the laminated iron core 21 using a constitutive equation that includes an elastic matrix including, as an element, the determined modulus of transverse elasticity; a step for calculating, as a difference spectrum, a difference between the excitation noise spectrum of the laminated iron core 21 and the excitation vibration frequency spectrum of the laminated iron core 21; and a step for diagnosing the noise performance of the transformer on the basis of the difference spectrum.
Inventors:
NAMIKAWA MISAO (JP)
Application Number:
PCT/JP2022/021303
Publication Date:
January 05, 2023
Filing Date:
May 24, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
H01F41/00; H01F27/245; H01F27/33; H01F41/02
Domestic Patent References:
| WO2020095527A1 | 2020-05-14 |
Foreign References:
| JP2017106893A | 2017-06-15 | |||
| JP2013021035A | 2013-01-31 | |||
| JP2020170797A | 2020-10-15 | |||
| JP6729837B1 | 2020-07-22 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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