264 8 INVESTING IN TRANSMISSION 8.5 8.6 Plot the marginal value of transmission as a function of the capacity of the transmission line connecting buses A and B. Determine the transmission demand function for the system of Problem 8.4. Calculate the hourly long-range marginal cost of the transmission line of Problem 8.4 assuming that the line is 500 km long, that the amortized variable cost of building the line is 210 S/(MW. km. year). Determine the optimal capacity of the transmission line of Problems 8.4.8.5 and 8.6, assuming the leading conditions shown in Figure P8.1. Determine the optimal capacity of the transmission line of Problems 8.4.8.5 and 8.6, for the three-part load-duration curves summarized in the table below. Assume that the periods of high, medium and low load coincide at both buses. 8.7 Period Load at A (MW) Load at B (MW) 2000 Duration (h) High 4000 2200 1000 Medium 1100 5000 Low 1000 500 2760 C e the amount of congestion revenue collected annually for this tim mission capacity with the annuitized cost of building the transmission Calculate the amount of congestion revenue collected annually for a transmissie 33.3% higher and 33.3 lower than the optimal transmission din Problem 8.8. Compare these values to the annuitized cost of his calculated in Problem the transmission line. 264 8 INVESTING IN TRANSMISSION 8.5 8.6 Plot the marginal value of transmission as a function of the capacity of the transmission line connecting buses A and B. Determine the transmission demand function for the system of Problem 8.4. Calculate the hourly long-range marginal cost of the transmission line of Problem 8.4 assuming that the line is 500 km long, that the amortized variable cost of building the line is 210 S/(MW. km. year). Determine the optimal capacity of the transmission line of Problems 8.4.8.5 and 8.6, assuming the leading conditions shown in Figure P8.1. Determine the optimal capacity of the transmission line of Problems 8.4.8.5 and 8.6, for the three-part load-duration curves summarized in the table below. Assume that the periods of high, medium and low load coincide at both buses. 8.7 Period Load at A (MW) Load at B (MW) 2000 Duration (h) High 4000 2200 1000 Medium 1100 5000 Low 1000 500 2760 C e the amount of congestion revenue collected annually for this tim mission capacity with the annuitized cost of building the transmission Calculate the amount of congestion revenue collected annually for a transmissie 33.3% higher and 33.3 lower than the optimal transmission din Problem 8.8. Compare these values to the annuitized cost of his calculated in Problem the transmission line