## 5 Conclusions  
This simulation studied the fault location on distribution systems. We compared the electricity outage with DG and without DG connected to the grid. This study aimed to investigate the effects of DG connection to the grid to address the problems on the distribution system. The simulated results present the parameters of the system that are due to install DG on that place. The parameters include voltage, current, and protective relay coordination, which are modelled after the actual PEA distribution system. The DG placement, which is close to the load or the middle line, has great advantages, such as the power loss and voltage improvement. With this, the middle line is complexed to select for DG placement at the present. Thus, the case studies compared the coordinated function without and with DG connections to the grid in various protective devices. Solutions were proposed to fix the malfunction of priority protective devices between recloser and fuse-link devices operating in the directional recloser device. The malfunctions between the recloser and fuse-link devices are provided. For this reason, the fuse link increases, which will provide more capacity for melting protection before the recloser operates at the fast curve zone. Thus, the electric loads lost power at this occurrence. This methodology is based on the adjustment of protection device coordination in case the distribution system has changing characteristic with different coordination related issues between various protective devices taken into consideration. Thus, the proposed coordination method can be applied to the various distribution system topologies that consist of similar protective devices.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Distancing** & **Voltage Level without DG** & **Voltage Level with DG** \\ **(km)** & **(kV)** & **(kV)** \\ \hline
2 & 22.62 & 22.85 \\ \hline
4 & 22.36 & 22.69 \\ \hline
6 & 22.10 & 22.58 \\ \hline
8 & 21.89 & 22.52 \\ \hline
10 & 21.80 & 22.20 \\ \hline
12 & 22.44 & 22.20 \\ \hline
14 & 22.32 & 22.25 \\ \hline
16 & 22.23 & 22.31 \\ \hline
18 & 22.15 & 22.42 \\ \hline
20 & 22.08 & 22.43 \\ \hline
22 & 22.01 & 22.52 \\ \hline
24 & 21.96 & 22.63 \\ \hline
26 & 21.90 & 22.73 \\ \hline \hline \end{tabular}
\end{table}
Table 12: Voltage improvement result in various positions.  
**Author Contributions:** Conceptualization, A.K.; Methodology, S.Y.; Software, W.K.; Validation, S.Y.; Formal Analysis, W.K.; Investigation, W.K.; Resources, I.N.; Data Curation, I.N.; Writing--Original Draft Preparation, W.K.; Writing--Review & Editing, A.K. and S.Y.; Visualization, S.Y.; Supervision, I.N.; Project Administration, A.K.; Funding Acquisition, I.N. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Research Council of Thailand.  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** Not applicable.  
**Acknowledgments:** The authors wish to gratefully acknowledge financial support for this research from the National Research Council of Thailand.  
**Conflicts of Interest:** The authors declare no conflict of interest.