Improvement method for low noise structure and sound absorbing structure of indoor substation

Abstract

The present invention relates to an improvement method for a low noise structure and a sound absorbing structure of an indoor substation. The method visualizes and quantifies an external sound field of a power transformer through acoustic radiation characteristics analysis, combines acoustic radiation characteristics of the power transformer with feedback information between design departments toimprove and optimize an overall layout and the sound absorbing structure of the indoor substation, to reduce sound pressure level at the boundary of a noise sensitive area. Optimization of the overalllayout of the indoor substation includes adjusting position of a transformer vault away from the noise sensitive area, reducing height of a clearstory and changing orientation of the clearstory; Improvements of the sound absorbing structure include increasing depth of a cavity of the sound absorbing structure, attaching a metal film to inside of a foam metal sound absorbing panel, and changing position of some sound absorbing material. The method analyzes the acoustic radiation characteristics through impedance tube comparison test and establishing a 3D multiphysics coupling model. The improved sound absorbing structure can effectively improve overall sound absorption effect and reduce sound radiation level of the substation.

Description

technical field [0001] The invention relates to the field of passive noise control, in particular to a passive noise control system for an indoor substation power transformer. Background technique [0002] With the advancement of urbanization and old city revitalization plans, people's pursuit of convenient, orderly and efficient lifestyles has increased the demand for electric energy; Adjacent to residential areas. Unlike suburban substations, which have sufficient space to reduce noise from power transformers, urban areas have limited space and stricter environmental noise standards, making indoor substations with a smaller footprint a preferred choice for designers and operators. The currently followed indoor substation design process is "electrical design—civil engineering design—noise level detection—noise reduction design". Different design departments are independent of each other. The noise reduction methods adopted by each department are limited, and the noise redu...

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Problems solved by technology

The currently followed indoor substation design process is "electrical design - civil engineering design - noise level detection - noise reduction design". Different design departments are independent of each other. The noise reduction methods adopted by each department are limited, and the noise reduction methods are regarded as remedial measures. It is not a preventive measure. For example, the civil engineering design department can only modify the civil engineering design part. After the noise level exceeds the standard, the civil engineering design department can only adopt the method of installing a sound insulation wall. However, the reason for the excessive noise may be that the layout design of electrical equipment does not take into account the transformer. The sound radiation characteristics of the substation, such a design process lacks feedback information between various design departments, and cannot find a most cost-effective way to reduce substation noise

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