电力电容器单元噪声测量方法的若干问题试验研究

Research on Several Issues in Noise Measurement of Power Capacitor

在测试环境内对电力电容器单元的噪声声功率级进行测量时,电力电容器单元的安装状态等因素与实际状态不完全一致,为了保证测量的声功率级与实际运行接近,必须对这些因素进行研究。试验研究表明,在半消声室内电容器噪声测量面为平行六面体表面,均布17个测点,测点距离六面体表面为1 m,电容器固定在钢支架上,电容器离地高度0.8 m,安装姿态与实际安装姿态一致时,可以实现电容器噪声声功率级精密级测量的要求。当在测量面上均布9个测点,电容器单元采用悬吊方式固定时,可以实现电容器噪声声功率级工程级测量的要求。

In case of measuring the sound power level of power capacitor unit in laboratory,such factors as installation condition of power capacitor unit is not in complete agreement with actual condition. For assuring the measured sound level power close to actual operation value,these factors must be studied.It is shown by the test that the noise measurement plane of the power capacitor in semi-anechoic laboratory is parallelepiped plane,with 17 uniformly distributed measuring points and with 1 m away from the surface of the parallelepiped plane. The capacitor is fixed on the steel bracket with 0.8 m from the ground;when the installation condition is the identical to that of actual condition,the precision measurement requirement for the sound power level of power capacitor can be achieved. In case of 9measurement points on the measurement surface and of the capacitor fixed by way of suspension,the requirement class measurement requirement for the sound power level of capacitor can be achieved.