A study on the relationship between the source frequency and the radio interference of the transmission line

With the increasing use of EHV and UHV transmission lines, the electromagnetic pollution caused by corona discharge is becoming a serious problem. One of the most important electromagnetic effects of corona activity of the transmission line is the radio interference. As the negative and positive corona are very different, the RI generated by them is closely related to the source. To find out the relationship between the source frequency and the RI, it is measured as the frequency of source changes. And through the analysis of the results, some regular patterns are found out. In this paper the RI is not studied at a particular frequency, the spectrum is from 1 kHz to 5 MHz. This work provides useful knowledge of the RI on transmission lines and find out some connections between the RI and the frequency of applied voltage.