In the measurement of power capacitor noise level

arrangement of measuring point have an influence on sound power results. There are several arrangement patterns which not be unified by manufactures and consumers of power capacitor. This paper compares the sound power results measures under several arrangement patterns

with identical meteorology and current excitation. The measurement surface has two types of shape

hemi-spherical and parallelepiped

and parallelepiped envelope surface would reach to the reflecting ground

or not. The sound power results have apparent differences. By comparison of these results

it is conclude that the areas of each measuring point corresponding with are approximately equal. Considering the reflecting surface

a virtual mirrored sound source of capacitor is assumed for analyzing the union effect of both origin source and reflection. Basing on this

the influence of arrangement patterns on sound power measurement is analyzed

and it is consistent with the results.