## 3 Protective Device Functional Operation in Case without DG  
Two case studies of case fault occurrence are provided here, such as the three-phase fault (3P) that gets a highest current magnitude of this case study. The single-line to ground fault (SLG) has an impedance of 40 ohms, which is getting a lowest current magnitude. However, this simulation program will be done by DigSILENT Power Factory, which divided the case studies in every connection point of the distribution line. The priority of protection coordination will be arranged on this system. The investigation of the fault occurs at three-phase and single-phase simulations, and the maximum current at location 1 was more than 8.6 times from the single-phase. The highest fault current is location 1, and the trending is decreased from this location until location 16, which is the lowest fault current. The fault current behaviour is dependent on the distance away from the fault location. Therefore, the fault impedance causes directly impact the fault current that injects into the grid. Thus, the results both with DG and without DG connections are shown in Table 6. \begin{table}
\begin{tabular}{c c} \hline
**Distance of DG Placement from Substation** & **Power Loss** \\
**(km)** & **(kW)** \\ \hline without DG & 370 \\ \hline
2 & 350 \\ \hline
4 & 280 \\ \hline
6 & 210 \\ \hline
8 & 180 \\ \hline
10 & 150 \\ \hline
12 & 140 \\ \hline
14 & 150 \\ \hline
16 & 160 \\ \hline
18 & 170 \\ \hline
20 & 190 \\ \hline
22 & 230 \\ \hline
24 & 270 \\ \hline
26 & 300 \\ \hline \end{tabular}
\end{table} 
Table 5: Power loss for various DG placements. Protective Relay Operation Sequential at Both Recloser R1 Location and Drop-Out Fuse Device at the Position 25k Such as F2, F3, F4, and F5, Respectively  
In Figure 2a,b, recloser R1 energises the power to AVR by the large transformer, which can increase the line voltage along this circuit. Thus, the inrush current of the circuit has been limited to cause by the AVR via operating time zone. Considering this, this recloser position is set up only on a slow curve mode. In addition, the configuration setting is shown in Table 7.  
However, the drop out fuse at the F1 position has provided the fuse link device at 15k rating, which cuts out positions F2, F3, F4, and F5, respectively. Thus, those devices are providing the fuse link at 25k. In Figure 2a,b, when the short circuit occurs at lateral in F2, F3, F4, and F5, respectively, which the fuse-link have been melted of the connecting couple point before the recloser activated. Every fault occurrence, the period in the lateral of the distribution system is more than 0.3 s. This means that the fuse-link devices of F2, F3, F4, and F5 positions have been broken down due to all loads after those fuse-links are getting loss the power. Sequential of Protective Relay Coordination between the Recloser R1 and Drop-Out Fuse Rated 15k at F1 Position  
While the recloser R1 is determined, the setting value is according to Section 3.1 in the graph plotting interval R1 recloser and fuse-link 15k, which is shown in Figure 3a,b of both phase and ground sides. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Locations**} & \multicolumn{2}{c}{**Maximum Current (A)**} & \multicolumn{2}{c}{**Minimum Current (A)**} \\ \cline{2-5}  & **3 \(\Phi\)** & **1 \(\Phi\)** & **3 \(\Phi\)** & **1 \(\Phi\)** \\ \hline
1 & 2812 & 326 & 2464 & 234 \\ \hline
2 & 2464 & 218 & 2050 & 314 \\ \hline
3 & 2266 & 313 & 1821 & 307 \\ \hline
4 & 2190 & 311 & 1534 & 295 \\ \hline
5 & 2178 & 311 & 1394 & 288 \\ \hline
6 & 2085 & 308 & 1527 & 295 \\ \hline
7 & 2021 & 306 & 1492 & 293 \\ \hline
8 & 1970 & 304 & 1863 & 303 \\ \hline
9 & 1921 & 302 & 1040 & 264 \\ \hline
10 & 1290 & 296 & 968 & 266 \\ \hline
11 & 1230 & 291 & 1045 & 274 \\ \hline
12 & 1211 & 289 & 935 & 262 \\ \hline
13 & 1141 & 282 & 627 & 219 \\ \hline
14 & 1109 & 279 & 1012 & 269 \\ \hline
15 & 1079 & 276 & 752 & 237 \\ \hline
16 & 937 & 258 & 836 & 244 \\ \hline \hline \end{tabular}
\end{table}