Power capacitor is one of the main noise sources in HVDC converter station.Accurate measurement of its noise sound power level at delivery stage is of great significance to predict and control the overall noise level of converter station.In this paper

the sound pressure method and sound intensity method are first analyzed to measure the noise sound power of power capacitor units.For a certain type of power capacitor unit

the noise test was carried out by using 17-point sound pressure and sound intensity method.It shown by the result that the test results of sound pressure and sound intensity method is very close

while the former method is simple and efficient.In addition

the difference of result with distance from the measurement surface and capacitor surface at 1 m and 0.3 m respectively by 17 points of sound pressure method is studied in the test and it is found through comparison with the test result of sound intensity method that when the measurement distance at 1 m is adopted

the result by sound pressure method and sound intensity method is more close.