Analysis of Arc discharge during the entry and exit of an equi-potential state by a live-line maintenance robot for 500 kv overhead transmission lines

摘要

With the development of power systems, the safe and stable operation of overhead transmission lines is critical to ensuring power supply reliability. However, issues such as conductor strand breakage and bolt loosening often arise during long-term operation. If not addressed promptly, these problems may lead to line failures, posing a threat to grid security. Traditional manual live-line maintenance is associated with low efficiency and high safety risks. To enhance operational safety and efficiency while reducing risks, this paper proposes the design of a live-line maintenance robot for transmission lines. The study focuses on analyzing the arc discharge phenomenon during the robot's entry and exit from the equi-potential state, investigating its discharge mechanism, and proposing electromagnetic protection measures. Simulation software is employed to model the electric field distribution, construct an equivalent circuit model, analyze discharge current characteristics, and develop a dual-layer material structure for shielding electromagnetic interference. Experimental validation of the robot's live-line operations demonstrates the accuracy of the simulation analysis and the effectiveness of the proposed electromagnetic protection measures. Results show that the arc discharge current generated by the robot ranges between 100 and 200 A, with frequencies spanning from 0 to 800 MHz, and energy primarily concentrated below 100 MHz. Based on these findings, it is recommended that the robot's communication with ground equipment avoid this frequency range.