Task-2 A radial feeder is shown in Figure 1. -3-Phase Transmission Line Bus-A Bus-B Bus-C Bus-D Z CBA CTA CB, CT CB CT.

[answerhappygod]

Task 2 A Radial Feeder Is Shown In Figure 1 3 Phase Transmission Line Bus A Bus B Bus C Bus D Z Cba Cta Cb Ct Cb Ct 1 (142.64 KiB) Viewed 32 times

Task-2 A radial feeder is shown in Figure 1. -3-Phase Transmission Line Bus-A Bus-B Bus-C Bus-D Z CBA CTA CB, CT CB CT. G 30MVA 11 kV ਤੇ ਤੂ RA Load-A 3MVA Load-B 7.5MVA Load- 5.5MVA Load-D 6MVA Figure 1 Radial Feeder Time graded overcurrent protection scheme is to be designed for this feeder using Inverse Definite Minimum Time (IDMT) relays at all busses. The maximum fault current of 2000 Ampere and a minimum fault current of 1200 Ampere is expected to flow for three-phase fault and single line to ground fault, respectively, between bus C and D. IDMT relays located at all buses can be assumed to be of 1 Ampere OR 5 Ampere rating with 100% plug setting. Circuit breakers at bus B and C take 0.6 S to operate. Relay located at bus A has an overshoot time of 0.08 S while relay at bus B has an overshoot time of 0.1 S. The Time Setting Multiplier (TSM) for the fastest QEAD Template A Rev: 04 ver 02 Date: 01 October 2018 Page 2 of 6 FIQAP/021/001 relay is to be set to 0.5. Neglect the voltage drop in the line sections for the calculations. Assume the Overload capacity of this feeder in the range of 20-35%. 0 Design appropriate CT ratios for CTA, CTB, and CTC. [06] (ii) Estimate time of Operation for all three relays for maximum value of fault current to maintain the selectivity. [06] Determine TSM for relays at bus A and B for maximum fault current. (Use the standard formula for IDMT relays for these calculations.) [06] (iv) Also use the standard curves for IDMT relays shown in Figure 2 to select TSM for relays at bus A and B for maximum fault current. Compare results obtained in (iii) and (iv). [06] (v) Verify the design to ensure that selectivity is maintained at minimum fault current for the fault in the same zone [06]