Vibration response analysis of iced transmission line under short-circuit alternating electrodynamic force

Abstract

When a short-circuit fault occurs in an AC transmission line, an alternating reciprocating load that changes periodically with the short-circuit current is generated, increasing the probability of adhesion accidents in the transmission line. To analyze the influence of alternating reciprocating load caused by short-circuit electrodynamic force on the spatial trajectory of iced transmission line vibration, the electrodynamic load is added to the vibration equation of transmission line, and the mathematical model of spatial magnetic field and an electrodynamic load of horizontal arrangement wire is established. The finite element software is used to establish the transmission line model under different short-circuit currents and working conditions. The state of electrodynamic load at each phase wire is clarified at each time. The electrodynamic load is matrixed, and the vibration equation of the transmission line is introduced. After obtaining the spatial displacement of the transmission line, the spatial displacement adhesion mechanism is used to determine whether the transmission line adheres. Clear the easiest adhesion conditions and critical adhesion current.