Method for analyzing sound radiation characteristics of power transformer in multiple operation states
A power transformer and characteristic analysis technology, applied in the direction of measuring electrical variables, instruments, measuring electricity, etc., can solve the problems of simple model, no calculation of transformer noise data, insufficient in-depth research of transformer vibration and acoustic simulation, etc., and achieve the effect of high calculation accuracy
Active Publication Date: 2019-12-13
WUHAN UNIV
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] At present, the research on the generation and transmission mechanism of power transformer vibration and noise mainly focuses on theoretical analysis and experimental research, and the simulation research on transformer vibration and acoustics is not deep enough. Most studies use the finite element algorithm to model the transformer core and calculate the transformer core. The generated vibration results, but the model is relatively simple, does not consider the influence of the winding and does not calculate the noise data of the transformer, so it cannot fully reflect the relevant characteristics of the vibration and noise of the power transformer in space
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0037] This embodiment provides a method for analyzing the acoustic radiation characteristics of a power transformer under multiple operating states, which is characterized in that it includes the following steps:
[0038] 1. Use three sets of coupling equations: electric-magnetic coupling, electromagnetic-mechanical coupling, and mechanical-acoustic coupling to describe the whole process of power transformer vibration and noise generation and transmission:
[0039] (1) Electromagnetic coupling. Due to the low frequency, neglecting the displacement current, a partial differential equation derived from Maxwell's equations can describe the electromagnetic process, that is, the current density of the winding in the time-varying, low-frequency magnetic field can be derived as:
[0040]
[0041] In the formula, σ is the electrical conductivity of the medium, μ is the differential magnetic permeability, and A is the magnetic potential.
[0042] (2) Electromagnetic-mechanical cou...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for analyzing sound radiation characteristics of a power transformer in multiple operation states. The method comprises the following steps of: describing a transformer vibration noise generation and transmission process by using three groups of coupling equations of electromagnetic coupling, electromagnetic-mechanical coupling and mechanical-acoustic coupling; according to a coupling mechanism of a plurality of physical fields,: establishing a full-size three-dimensional sound radiation finite element calculation model of the power transformer, respectively carrying out far-field analysis and directivity analysis on various operation states of the power transformer, and drawing a three-dimensional space sound pressure level distribution diagram according to far-field analysis and directivity analysis results, so that the space sound radiation characteristics of the on-site power transformer are visualized; according to the invention, the calculation result has high calculation precision, data support can be provided for noise reduction engineering of the power transformer in the transformer substation, and acoustic guidance is provided for optimizing spatial layout of cities around the transformer substation.
Description
technical field [0001] The invention relates to a method for analyzing noise radiation characteristics of a power transformer, in particular to a method for analyzing noise radiation characteristics of a power transformer under various operating states. Background technique [0002] As cities expand, urban electricity loads gradually increase, and substations originally located in the suburbs are gradually surrounded by new buildings. Since the noise of power transformers will affect the basic activities of nearby residents, the noise emission level faces stricter environmental noise standards. Therefore, theoretical methods and practical measures to evaluate the noise level of power transformers and reduce noise impacts have attracted widespread attention. Due to safety reasons, it is impossible to measure the sound field in all directions around the power transformer in operation, which means that the spatial acoustic radiation characteristics of the power transformer on s...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01R31/00G01H3/00G01H3/10
CPCG01R31/00G01H3/00G01H3/10
Inventor 应黎明王东晖张露王晋伟
Owner WUHAN UNIV