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Solve the following problem in per unit using a base of 100 MVA, 230 kV 2...
Problem #1 Part I (50 points) Consider the following one-line diagram of a three-phase power system. Assume that the system has the following base quantities: S3 100 MVA, and VbaselL 38 kV at the generator side. The rated line-to-line terminal voltage of the generator (BUS 1) is 38 kV. A single-circuit three-phase transposed overhead line composed by one ACSR Partridge conductor per phase with vertical configuration. The transmission line length is 50 km and the distance between phases a-b, b-c...
three-phase transformer is rated at 12 kV/135 kV, 100 MVA. It has the following equivalent circuit parameters (referred to the primary winding where appropriate) : • primary resistance R1 = 0.03 ohms, secondary resistance R2’ = 0.04 ohms • primary leakage reactance X1 = 0.1 ohms, secondary leakage reactance X2’ = 0.1 ohms • magnetising reactance XM = 16 ohms, core-loss resistance RC = 200 ohms. In your calculations, you should use the simplified equivalent circuit. i) The transformer is...
A 230-kV, three-phase transmission line has a per phase series impedance of z = 0.05j0.45 2 per km and a per phase shunt admittance ofy = j3.4 x 10-6 siemens per km. The line is 80 km long. Using the nominal r model, determine (a) The transmission line ABCD constants. Find the sending end voltage and current, voltage regulation, the sending end power and the transmission efficiency when the line delivers (b) 200 MVA, 0.8 lagging power factor at 220...
Please show me step by step how to get load impedance in per-unit. New load is 1.05+1.4j per unit and new z load is 0.447 per unit Consider the three-phase power system in the figure below. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedances, including the load impedance in per-unit. Lines 1 and 2 have series reactances of 48.4 and 65.43 2, respectively. At bus 4,...
Show the solution for the following problem 1. A short, 230 kV transmission line has an impedance of 5 cis 78 ohms. The load at the receiving end is 100 MW at 230 kV, 85% lagging power factor. What is the voltage at the sending end? a. 235.43 kV b. 226.3 kV c. 231.78 kV d. 238.21 kV 2. A 66 kv medium length transmission line delivers a load of 10 MW at 66 kv and 80% lagging P.F. the...
PROBLEM 5 (20 pts]: Draw an impedance diagram for the electric power system given in the Figure 4 showing all impedances in per unit on a 100MVA base. Choose 20/200 kV as the voltage base. If there is a three-phase to ground solid fault at the load bus, what will be fault current taken from generator 1. The three-phase power and line-line ratings are given below. Gl: 90 MVA, 20 kV, X = 9%; TR1: 80 MVA, 20/200 kV, X...
Transformer TI : 50 MVA, 10 kV Y/138 kV Y, X=0.10 per unit; Transformer T2: 100 MVA, 15 kV D/138 kV Y, X-0.10 per unit; Each 138-kV line: X1-400 A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV. Prefault load current is neglected. (a)Draw the positive-sequence reactance diagram in per-unit on a 100-MVA, 15-kV base in the zone of generator G2. Determine: (b) the The'venin equivalent at the fault, (c) the subtransient fault current...
A375-kV 60Hz three-phase 500 miles long transmission line with distributed line parameters per mi of r 0.1 Ohm, L-1.365 mH, c 0.00842 uF and g 0 delivers 200 MW to the load at 350 kV at 0.85 power factor lagging. Find the following: 2. 50 pts. a) Characteristic impedance, attenuation constant and phase constant. b) sinhyL c) Transmission parameter A. d) Transmission efficiency if the sending end voltage and current are is 238.81419.07 kV/phase and 306.07228.783 A respectively using long-line...
PROBLEM: A 230-kV, 50 Hz, three-phase transmission line is 120 km long. The line has a per phase series impedance of z-0.05 +j0.45 Ω per km, and a per phase shunt admittance of y 3.4x10-6 Siemens per km. The line delivers (at the receiving end) 200 MVA, 0.8 lagging power factor at 220 kV. Now consider two cases: A- Assume that shunt parameters of the transmission line are ignored (i.e. even if this is a medium length transmission line, under...
QUESTIONS 1- A 69-kV, three-phase transmission line is 20 km long. The line has a per phase series impedance of 0,120 + 10,4325 per km. Detemine the sending end voltage, voltage regulation, the sending end power, and the transmission efficiency when the line delivers (a) 60 MVA, 0.8 lagging power factor at 60 kV. (b) 110 MW, unity power factor at 60 kV