Abstract
Single-column UHV shunt reactors usually generate large noises with long wavelengths. For this reason, the noises along the substation boundaries may exceed the standards. We aimed at noise control of single-column UHV shunt reactors in the present study. Based on the noise characteristics of single-column UHV shunt reactors, we employed an acoustic impedance test apparatus and studied the influences of different structural parameters on the acoustic performance of the compound impedance sound-absorbing structure. The results showed that the compound impedance sound-absorbing structure had a better sound-absorbing performance at low frequencies if a microperforated plate was introduced with basalt cotton as the filler. Besides, as the surface density, thickness, size of the dorsal cavity, and size of the intermediate cavity increased, the sound absorption coefficient at low frequencies increased. After the surface density increased to a certain level, the increase rate of the sound-absorbing performance dropped suddenly. Moreover, the intermediate cavity achieved a lesser enhancement of sound-absorbing performance at low frequencies than the dorsal cavity.
Highlights
Recent years have witnessed a constant development of ultra-high-voltage (UHV) grids
We examined the influence of the compounding parameters on the acoustic performance of the sound-absorbing structure [7], [8]
Based on the noise characteristics of the single-column UHV shunt reactors, we analyzed the influence of different structural parameters on the acoustic performance of the compound impedance sound-absorbing structure
Summary
Recent years have witnessed a constant development of ultra-high-voltage (UHV) grids. The noises generated by the reactors are predominantly in the low-frequency band and are of long wavelengths. Glass wool and other fibers are usually used as sound-absorbing materials for single-column UHV shunt reactors. Glass wool has a lower sound absorption coefficient at low frequencies. It is brittle, broken, and not environmentally friendly. Glass wool can hardly meet the noise reduction and service life requirements for single-column UHV shunt reactors [3], [4]. A STUDY ON THE ACOUSTIC CHARACTERISTICS OF THE SOUND-ABSORBING STRUCTURE IN SINGLE-COLUMN UHV SHUNT REACTORS.
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