Advanced Anti-icing\nand Deicing Strategies for Overhead\nPower Transmission Lines Based on Giant Magnetocaloric Effect of La<sub>0.7</sub>Ca<sub>0.254</sub>Sr<sub>0.046</sub>MnO<sub>3</sub>

Perovskite manganates (AMnO<sub>3</sub>) exhibit diverse\nstructural,\nthermal, electrical, and magnetic properties. Their strong magnetocaloric\neffect (MCE) near the Curie temperature (<i>T</i><sub>C</sub>) makes them ideal for magnetic-thermal anti-icing and deicing in\npower transmission lines. Below <i>T</i><sub>C</sub>, ferromagnetic\nAMnO<sub>3</sub> produces heat through multiple mechanisms, with the\nchanging magnetic field induced by the strong AC current, causing\nheat through magnetic hysteresis and eddy currents, alongside the\ndirect MCE. Above <i>T</i><sub>C</sub>, no heating is generated,\nas MCE is unfavorable, thus preventing additional energy loss at elevated\ntemperatures. In this work, La<sub>0.7</sub>Ca<sub>0.254</sub>Sr<sub>0.046</sub>MnO<sub>3</sub> with <i>T</i><sub>C</sub> close\nto 0 °C were synthesized by solid-state reaction. It is found\nthat particle size >10 μm is beneficial for a large MCE,\nbased\non the results of particle size dependence of MCE. The resulting maximum\nmagnetic entropy change at 277 K is 7.69 J·kg<sup>–1</sup>·K<sup>–1</sup>, and an adiabatic temperature change\nof 3.87 K at 277 K is achieved under 5 T. The prototype cable is fabricated\nusing a well-established wire drawing process. A climate-simulation\nchamber is employed for the anti-icing and deicing experiments. The\nprototype cables demonstrated a strong capability for deicing and\nanti-icing. This simple and cost-effective prototype cable shows significant\npotential for mitigating the icing problem of overhead high-voltage\npower transmission lines.