Parametric resonance mechanism of conductor galloping without icing on overhead line

In order to explain the causes of the overhead line conductor galloping phenomenon better, the galloping on overhead line with a single conductor is studied by equating the wind load to axial periodic displacement excitation. It is concluded that the galloping of a single conductor without icing is parametric resonance. According to this mechanism, the main influence factors of the galloping are the periodic variation of transmission line system's parameters. The parametric resonance of system will occur, i.e. galloping, when the excitation frequency and eigenfrequency of system satisfy a certain relationship. The mechanism established is verified to be able to explain the transmission line conductor galloping through simulated operational line vibration experiments.