## 4 Simulation Results and Discussion
#### 4.1.1 Speed of Patrolling the Line  
When the staff patrols a line, the speed of inspection will be different because of weather conditions, traffic conditions, and other factors, which directly affect the time of fault location. At the same time, with the continuous development of intelligent line patrol equipment, the speed of patrolling the line will continue to improve. Taking the optimized configuration scheme of fault indicator solved in this paper as an example, the configuration scheme of fault indicator under the different speed of overhead line inspection is shown in Table 2. It can be seen from Table 2 that the total cost has gradually decreased from 270.74 USD to 163.05 USD. In order to more intuitively reflect the changing trend of the number of fault indicators to be installed and the average time for fault location with the change of speed of patrolling the line, a line chart is shown in Figure 8. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Scheme**} & **Installation** & **Installation** & **Installation** & **Installation** & **Average** & \\  & **Number of** & **Position of** & **Number of** & **Position of** & **Time for** & **Total Cost** \\  & **Acquisition** & **Acquisition Unit** & **Collection** & **Collection** & **Fault** & **(USD)** \\  & **Unit** & & **Unit** & **Unit** & **Location (h)** & \\ \hline \multirow{2}{*}{2} & 18 & 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, & \multirow{2}{*}{2} & \multirow{2}{*}{8,12} & \multirow{2}{*}{0.226} & \multirow{2}{*}{270.74} \\  & & 13, 15, 17, 18, 19, 22, & & & & \\ \hline \multirow{2}{*}{4} & 14 & 3, 5, 6, 8, 9, 10, 11, 12, 13, & \multirow{2}{*}{1} & \multirow{2}{*}{7} & \multirow{2}{*}{0.303} & \multirow{2}{*}{228.48} \\  & & 18, 19, 22, 23 & & & & \\ \hline \multirow{2}{*}{8} & 10 & 3, 5, 6, 8, 9, 10, 11, 13, 18, & \multirow{2}{*}{1} & \multirow{2}{*}{7} & \multirow{2}{*}{0.277} & \multirow{2}{*}{196.54} \\  & & 18, 19, 22, & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Optional placement of fault indicators under different speed of patrolling the line. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Speed (km/h)**} & **Installation** & **Installation** & **Installation** & **Average** & \\  & **Number of** & **Installation Position of** & **Number of** & **Position of** & **Time for** & **Total Cost** \\  & **Acquisition Unit** & **Acquisition Unit** & **Collection** & **Collection** & **Fault** & **(USD)** \\  & **Unit** & & **Unit** & **Unit** & **Location (h)** & \\ \hline \multirow{2}{*}{2} & 18 & 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, & \multirow{2}{*}{2} & \multirow{2}{*}{8,12} & \multirow{2}{*}{0.226} & \multirow{2}{*}{270.74} \\  & & 13, 15, 17, 18, 19, 22, & & & & \\ \hline \multirow{2}{*}{4} & 14 & 3, 5, 6, 8, 9, 10, 11, 12, 13, & \multirow{2}{*}{1} & \multirow{2}{*}{7} & \multirow{2}{*}{0.303} & \multirow{2}{*}{228.48} \\  & & 18, 19, 22, & & & & \\ \hline \multirow{2}{*}{8} & 10 & 3, 5, 6, 8, 9, 10, 11, 13, 18, & \multirow{2}{*}{1} & \multirow{2}{*}{7} & \multirow{2}{*}{0.277} & \multirow{2}{*}{196.54} \\  & & 18, 19, 22, & & & & \\ \hline \multirow{2}{*}{15} & 6 & 5, 6, 10, 11, 13, 18 & \multirow{2}{*}{1} & \multirow{2}{*}{6} & \multirow{2}{*}{0.239} & \multirow{2}{*}{171.68} \\  & & 18, 19, 22, & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Comparison of two configuration schemes of fault indicator. As shown in Table 2 and Figure 8, with the increase in speed, the total cost is on the decrease, and the number of fault indicators and the average time required for accurate location of the line fault point is gradually reduced, which greatly improves the system operation safety and power-supply reliability. Therefore, under the condition of a certain number of collecting units, the research and development of advanced automatic line inspection equipment to improve the speed of line inspection is an effective way to quickly locate the fault point.