## 4 Example Analysis
### Reliability Evaluation of the Distribution Network Considering the Impact of Terminal Faults  
In order to analyze the improvement effect of the sensing and control terminal on the operation reliability and the impact of the fault of the sensing and control terminal on the reliability, this paper designs three comparison scenarios. Scenario 1 is that each sectional switch is installed with a sense-control terminal, and it is supposed that the sense-control terminal is 100% reliable. Scenario 2 is that each section switch is installed with a sense-control terminal, and the sense-control terminal fault is taken into account. Scenario 3 is the result of the fact that each section switch is not installed with a sense-control terminal. The reliability index of medium-voltage systems and the specific load point index in three scenarios. The system reliability indices in the three scenarios are shown in Table 5. By comparing Scenario 1 and Scenario 3, it can be seen that after the sensor control terminal is configured on the segmented switch, the power supply reliability index of the system is significantly improved, SAIDI and ENS are greatly reduced, and ASAI is increased by 0.0153%. This is because the sense-control terminal can reduce the time of fault location and then shorten the power outage time for the user, so that the SAIDI and ENS indices of the system are reduced and the ASAI index is improved. By comparing the indices of scenario 1 and scenario 2, it can be seen that after considering the influence of sensor terminal failure, the SAIDI and ENS of the system are increased by 11.80% and 5.34%, respectively, and the ASAI is decreased by 0.0095%. Therefore, in the process of reliability analysis of a medium and low-voltage distribution network, it is necessary to consider the influence of the faults of the sensing and control terminal components. At the same time, the SAIFI in the three scenarios is 1.2013, which does not change with the different scenarios. This is because the index is only related to the number of power outages experienced by the user, and the operating state of the sensing and control terminal only affects the user's power outage time. When the distribution network is in \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Method**} & **SAIFI** & **SAIDI** & **ASAI** & **ENS** \\  & **(Times/Household-Year)** & **(h/Household-Year)** & **(\%)** & **(kWh/Year)** \\ \hline Collaborative assessment & 1.2013 & 3.2647 & 99.9616 & 4615.43 \\ \hline Sequential evaluation & 1.1765 & 3.0127 & 99.9631 & 4526.06 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Calculation results of the system reliability index. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Method**} & **SAIFI** & **SAIDI** & **ASAI** & **ENS** \\  & **(Times/Household-Year)** & **(h/Household-Year)** & **(\%)** & **(kWh/Year)** \\ \hline Scene 1 & 1.2013 & 3.2647 & 99.9616 & 4615.43 \\ \hline Scene 2 & 1.2013 & 3.6502 & 99.9521 & 4862.31 \\ \hline Scene 3 & 1.2013 & 5.2214 & 99.9463 & 5788.24 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Calculation results of the system reliability index. normal operation, the fault of the sensing and control terminal will not cause the user's power outage, so the index is unchanged in the three scenarios. Reliability Evaluation of Distribution Networks Considering the Impact of Different Planning Schemes  
To analyze the impact of different distribution automation terminal planning schemes on the reliability of distribution networks, we set up three comparative scenarios in this section. Scenario 4 is to configure the section switch of the TUs without tele-control function at the circuit breaker outlet. Scenario 5 is to configure the section switch of the TUs with tele-control function at the circuit breaker outlet. Scenario 6 is to configure the section switch of the TUs with tele-control function at the end of the line.