Research on Transient Performance of Non-Stop Ice Melting Method for Long-Distance Multi-Feeder Overhead Lines in Distribution Network

Nowadays, the research on ice melting technology primarily focuses on the thermal effect in the steady state process of ice melting, and there is a lack of research on the transient process of ice melting devices. To solve this problem, we takes the online ice melting technology befitting for distribution network as the research object, analyzes the transient performance of ice melting from its ice melting working principle, establishes a mathematical model of the excitation inrush current transient of the grounding transformer, and proposes an excitation inrush current suppression strategy for the grounding transformer. A branch line in the mountainous area of northern Guangdong is used as a pilot line, and the transient characteristics and the feasibility of the excitation inrush current strategy are verified according to the parameters of the icing line. The results show that during the switching period of the ice melting device, the overcurrent transient state will occur in the distribution network system, which bring serious challenges and threats to the security and stability of the system. The excitation inrush current suppression strategy can better suppress the transient overcurrent and ensure the safety of online ice melting method.