In this paper

according to the basic law of producting noise in HVDC capacitor

the capacitor noise suppression method is analyzed and raised from acoustical principle prespective

some actual experience has been obtained.Noise reduction methods such as vibration energy decreased device and sound-insulation cavity etc.have been used in actual projects and obtained the national patent.Firstly

the spring shock absorber and resonance sound absorber are theoretically analyzed

and the obtained conclusion is that resonance-type of noise reduction measures is not very good.The noise test shows that the most effective way of capacitor noise suppression is install the insulation cavity at both ends of bottom cover capacitor unit.