A Method for the Indirect Detection of Audible Noise from High-Voltage Direct Current Transmission Lines

Corona discharge will occur on high-voltage direct current (HVDC) transmission lines with the increase in voltage level, accompanied by audible noise, radio interference, and other phenomena. Audible noise has a serious negative impact on the lives and health of the residents around transmission lines. Therefore, it is very important to detect and study audible noise for the optimal design of transmission lines. However, the existing audible noise detection method is the direct detection method, which is vulnerable to the background noises. It is difficult to obtain the accurate measurement values in complex outdoor environment. Based on the relationship between audible noise and corona current, this article presents a method to obtain the A sound level of audible noise indirectly by measuring the corona current, which is called the indirect detection method of audible noise. The validity and accuracy of the proposed method are verified by the experiments of outdoor corona cage and actual HVDC transmission line segment. The proposed method provides a new way to solve the problems of direct detection of audible noise and can complement the existing method.