电力电容器噪声辐射比的计算方法研究

he power capacitor is one of main noise sources in converter station, so the influences to social environment have been gradually paid great attention. The radiation ratio of capacitor can be concluded by studying on the calculation methods, thus the noise of the capacitor will be obtained directly, providing the basis for capacitors noise reduction. Based on vibration and sound radiation theory of plate and shell structure and radiation properties of capacitor, the system testing vibration and noise radiation of the capacitor surfaces was established in a semi-anechoic room. This paper acquired frequency curve of radiation efficiency exponent by using surface vibration velocity method and transfer function method. Finally according to noise radiation efficiency exponent curve of different surfaces in capacitor , calculated noise value at a single frequency, and comparing the calculation value of each faces with the measured value, it was verified that the two methods are feasible and accurate.