Self Evaluation questions ELECTRICAL Department, RESTRUCTURED POWR SYSTEM by A R ABHYANKAR, IIT Delhi, New Delhi. Module 4 1.Write down various limits imposed by physical and electrical characteristics of electric power. 2.Pro-rata methods of congestion management are market-based methods. True or False. 3.Why TTC is different from transmission capacity? 4.Define Power Transfer Distribution Factor (PTDF). 5. In a power system, as more and more transactions are imposed on the base case, the ATC a)keeps on decreasing b)keeps on increasing c)remains same d) may decrease or increase 6. A certain network has 3 lines which are currently carrying 60 MW, 50 MW, and -80 MW respectively. (-ve sign indicates direction opposite to what we have initially assumed). The PTDF factors for a transaction between node m and n are 0.25, -0.3, 0.25, respectively. If maximum capacity of each line is 100 MW in either direction, what is the ATC between the nodes m and n. 7. The PTDF factors are calculated for a certain power network based on DC load flow model. Which of the following statements are true? a) PTDF factors change if base case changes b)  PTDF factors do not change even if base case changes c)  PTDF factors change when new transactions are imposed d)  PTDF factors do not change even if new transactions are imposed 8. The PTDF factors are calculated for a certain power network based on AC load flow model. Which of the following statements are true? a) PTDF factors change if base case changes b)  PTDF factors do not change even if base case changes c)  PTDF factors change when new transactions are imposed d)  PTDF factors do not change even if new transactions are imposed 9. Explain in brief what do you understand by following terms: TTC, ATC, TRM 10.Theoretically, what is the maximum numerical value the PTDF can take?