Analysis of Temperature Rise Characteristics and Fatigue Damage Degree of ACSR Broken Strand

In this paper, the research on ACSR temperature of broken strand and fatigue damage after broken strand is carried out. Conduct modeling and Analysis on the conductor through Ansoft Maxwell software. The distribution of magnetic force lines in the cross section of the conductor after strand breaking and the temperature change law of the conductor with the number of broken strands are analyzed. A model based on electromagnetic theory is established to analyze the distribution of magnetic lines of force in the cross section of the conductor after strand breaking and the temperature variation law of the conductor with the number of broken strands. The finite element analysis results show that with the increase in the number of broken strands, the cross-sectional area of the conductor decreases, the magnetic line of force of the inner conductor at the broken strand becomes denser and denser, and the electromagnetic loss of the conductor becomes larger and larger. Therefore, the temperature of the conductor at the broken strand becomes higher and higher. Then, the current carrying experiment of conductor is carried out for LGJ-240/30 conductor. It is found that the temperature rise at the junction of inner and outer layers at the broken strand is particularly obvious, and the temperature of inner aluminum conductor at the broken strand also increases with the increase of broken strand. According to the analysis of experimental data, with the increase of broken strands, the antivibration ability and service life of the conductor decrease. At the same time, under certain conditions of broken strand, the fatigue life of conductor increases with the increase of temperature.