运行温度对电容器噪声影响的研究

Resarch on the Influence of Operating Temperature on Capacitor Noise

电容器噪声试验中,其心温对噪声测量结果有着重要的影响。然而,鲜有文献研究心温对电容器噪声的影响。应用《GB/T 32524.1-2016声学声压法测定电力电容器单元的声功率级和指向特性第1部分:半消声室精密法》中的测试方法,根据给定的电流加载条件,对电容器在不同心温下辐射的声压级和声功率级进行测量。试验结果表明,随着电容器心温的升高,其声功率级有明显的先升后降的趋势,且在电容器心温接近温度类别上限时,其辐射的声功率级明显高于其他温度时的数值,不同温度下其声功率级的最大差值可达3.5 dB。但是,电容器心温只改变其声压级和声功率级的大小,不会改变辐射噪声的规律。

In the noise test of capacitor,the temperature of capacitor core has an important influence on the noise measurement results. However,there is little paper researching on the influence of capacitor core temperature on its noise. Using the ’GB/T 32524.1-2016 Acoustics-Determination of sound power level and directivity character of power capacitor unit using sound pressure-Part 1: Precision method for hemi-anechoic room’,and according to the given injection current conditions,the sound pressure level and sound power level are measured when the temperature of capacitor core are different. The results show that,with the increases of capacitor core temperature,the sound power level will obviously first rise and then fall,and when the capacitor core temperature approaches the upper limit of the temperature category,the sound power level is significantly higher than that at other temperatures. The maximum deviation in sound power level at difference temperature is 3.5 dB. But the temperature of capacitor core only changes the magnitude of its sound pressure level and sound power level,and does not change the law of radiated noise.