Select the CT-Ratios, current tap settings (TSS), and time-dial settings (TDs) for the over current relays deployed in the radial distribution system shown below. The system data are given in Tables 1-3. Assume four co- relays for the breakers, with a 0.3-second coordination time interval. 13. FI F3 B hu 345 KVA/34.5Y hu Bus 1 2 3 4 Table 1: Loads ratings S (MVA) 12 10 8 6 Lagging PF 0.9 0.9 0.9 0.9 Bus 1 Table 2: Fault Current Ratings Max, Balanced Iph to ground (A) 4500 4000 3500 3000 2 3 4 Min. SLG or LL (A) 2500 2000 1500 1000 Bus 1 Table 3: Breakers information Operating time (s) CT ratio 6 cycles ? 6 cycles 7 6 cycles 2 6 cycles ? 2. 3 4 Relay CO-8 CO-8 CO-8 CO-8 Time-Current Characteristics type Co-8 Typical time curves Type CO-B Over current relay 50-60 hertz 6 Current tap setting A 5 05 06 0.8 1.0 1.5 20 25 Time dial setting Relay operating time seconds 5 > 2 NOON 0.5 2 3 5 6 7 8 10 12 14 16 20 Select the CT-Ratios, current tap settings (TSS), and time-dial settings (TDs) for the over current relays deployed in the radial distribution system shown below. The system data are given in Tables 1-3. Assume four co- relays for the breakers, with a 0.3-second coordination time interval. 13. FI F3 B hu 345 KVA/34.5Y hu Bus 1 2 3 4 Table 1: Loads ratings S (MVA) 12 10 8 6 Lagging PF 0.9 0.9 0.9 0.9 Bus 1 Table 2: Fault Current Ratings Max, Balanced Iph to ground (A) 4500 4000 3500 3000 2 3 4 Min. SLG or LL (A) 2500 2000 1500 1000 Bus 1 Table 3: Breakers information Operating time (s) CT ratio 6 cycles ? 6 cycles 7 6 cycles 2 6 cycles ? 2. 3 4 Relay CO-8 CO-8 CO-8 CO-8 Time-Current Characteristics type Co-8 Typical time curves Type CO-B Over current relay 50-60 hertz 6 Current tap setting A 5 05 06 0.8 1.0 1.5 20 25 Time dial setting Relay operating time seconds 5 > 2 NOON 0.5 2 3 5 6 7 8 10 12 14 16 20