## 2 Distribution System Simulation  
The simulation system replicates the actual load characteristic of the PEA 22 kV radial distribution system. The load characteristics are based on PEA's load profiles at Khok Samrong district, Loppuri province, Thailand, as shown in Table 1. By considering data in Table 1, the load demand of this system is 4890 kVA capacity consist of the medium-scale industry in total of load demand 3700 kVA, small-scale industry has only one location in 500 kVA and the remaining residential loads in total 690 kVA, respectively. From the single-line diagram, the system energizes the power from bus B1 to all loads, which flows the current pass through the primary line to load location in total 39 load positions. Belonging to the load characteristics that could be separated by 3 industrial loads and 36 residential loads which is based on sizing of distribution transformers as shown in Figure 1. In addition, the DG is placed at the opposite of bus-B6, which is the end of primary feeder. \begin{table}
\begin{tabular}{l c c} \hline \hline  & **Load Position** & **Load Types** & **Load Demand (kVA)** \\ \hline L1 & Medium scale industry & 2700 \\ \hline L2, L12, L19 & Residential & 50 \\ \hline L3, L4, L6, L9, L10, L13, L15, L32, L37 & Residential & 250 \\ \hline L5, L16, L17, L18, L23, L25, L30, L34, L36, L38 & Residential & 150 \\ \hline L7, L11, L27 & Small scale industry & 500 \\ \hline L8, L14, L21, L22, L24, L26, L31, L33, L35 & Residential & 100 \\ \hline L20 & Residential & 30 \\ \hline L28 & Residential & 10 \\ \hline L29 & Residential & 100 \\ \hline L39 & Medium scale industry & 1000 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Load characteristics of PEA’s 22 kV radial distribution system. Under this system study is a single primary feeder, that consists of four major devices installed at this system, which consist of recloser, dropout fuses, distribution transformers, and Automatic Voltage Regulation (AVR). The recloser devices are placed at three locations along a feeder, such as the recloser-R1 is placed nearby the bus-B1 and bus-B2. The recloser-R2 is closely placed middle line and located the AVR. The recloser-R3 is placed for separating the end of the primary line, which has been utilised for disconnecting loads from L30 until L39. Dropout fuses are placed at every lateral along the distribution line. The power cables are studied in the main three cable types, which are proposed in the system for simulation, the spaced aerial cables (SAC), partial insulated cable (PIC), and aluminium conductor steel reinforced (ACSR), respectively. The cross-sections of these cables will be held by both 50 and 185 mm\({}^{2}\) in these studies. The SAC of 50 mm\({}^{2}\) shows the DC resistance of the cable is highest as compared to others. Additionally, the characteristics of other cables are shown in Table 2. The parameters of each cable are shown in terms of positive, negative, and zero sequences, which are based on the PEA cable parameters (Table 3). The case study will focus on the coordination between fuse-link and recloser devices. There are studies of cases that consist of both phase fault and grounding fault situations with both single and three-phases faults. The comparison is presented by vary sizing of fuse-link and reclosers, which are determined sizing via protection coordinates curves both without DG and with DG placement. In case without DG, the case study consists of (1) The recloser R1 and Fuse-link 15k, (2) The recloser R1 and Fuse-link 25k, (3) The recloser R1 and R2, (4) The recloser R2 and R3, and (5) The recloser R3 and Fuse-link 25k.