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.