In this study

the generation mechanism of capacitor noise was analyzed

and a shunt capacitor noise experiment was conducted on a 10 kV power quality harmonic disturbance source test platform under the voltage with superposition of power-frequency fundamental wave and harmonics with different voltage distortion rates.Consequently

the harmonic noise curve of the capacitor was obtained under the harmonics with different order

and the impact of the harmonics on 10 kV parallel capacitor

as well as the capacitor noise spectrum in typical condition

was analyzed. Test results show that for the activation source of fundamental wave superposed with harmonics

the frequency of capacitor noise mainly focuses on the characteristic frequencies of fundamental wave’s double octave frequency

（h+1）th harmonic frequency

（h-1）th harmonic frequency

and 2hth harmonic frequency.