Abstract
The alternating reciprocating electrodynamic load with periodic variation of short-circuit current will be generated when the triangular arrangement of iced transmission lines is short-circuited, which may lead to the occurrence of adhesion accidents. In order to analyze the vibration law of triangularly arranged iced conductors under the action of short-circuit alternating electrodynamic force, this paper establishes a mathematical model of spatial magnetic field and electrodynamic load of triangularly arranged conductors according to the principle of field strength superposition. The transient solution domain of COMSOL finite element analysis software is used to establish the simulation model of transmission conductor. The variation law of alternating reciprocating load of transmission conductor under short-circuit state is clarified, and the mathematical model of adhesion judgment of triangularly arranged transmission conductor is established. The horizontal displacement and vertical displacement of transmission conductor under different conditions are solved. The results show that: 1) The electrodynamic force generated by short-circuit current changes periodically, and the amplitude will gradually decay. 2) The thicker the conductor icing is, the smaller the electrodynamic force is, and the smaller the displacement of the conductor is; 3) The horizontal displacement and vertical displacement amplitude of the triangular arrangement wire are similar, indicating that when the direction of the electric dynamic load is the same, considering the displacement of the two directions, it is found that the A and C two-phase wires first adhere.
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