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- In the following network, the voltage magnitudes at all buses are equal to 1 p.u., the voltage phase angles are very small, and the line resistances are negligible. All the line reactances are equal to j1 p.u. (1) (2. P₂ = 0.1 p.u. P3 = 0.2 p.u. The voltage phase angle 83 in radian at bus 3 is (Assume one of the generator bus as slack bus and sin-¹ (0.1) = 0.1 rad) (a) -0.1 (b) -0.2 (c) 0.1 (d) 04. A transformer is rated 1000 MVA, 13.8 kV/345 kV with Z=j0.10 pu. If the system base MVA is 500, the corresponding pu impedance becomes (a) j0.10/2 pu (b) j0.10/4 pu (c) j0.10*2 pu (d) j0.10*4 pu 5. Ia, Ib and I, are the three current phasors of a load. For a balanced-load condition, which relation is valid? (a) IF - (Ib + I.) (c) la + I = 1. (d) Ia - I = I. (b) la = I, = Ie30) In a lightly loaded long distance EHV lines, line loading is and has a power factor: (A) Capacitive, lagging. (B) Capacitive, leading (C) Inductive, lagging (D) Inductive, leading. please contact me in whatsapp +962782974574
- The fault current level of a circuit breaker used in a transmission line with phase voltage 2.2 kV and breaking capacity 60 MVA is ......................kA. Complete the answer.The sample large power system network data's are given below, The total number of buses is 5 Three-phase short circuit fault subjected at the bus 5 The initial voltage of the faulted bus is 1.0 p.u The Z matrix element Z55 is 0.474 p.u Fault impedance Z= 0.46 p.u Fault current (- )in p.uThe VSWR on an 50-Ohm transmission line is 5. The distance between successive voltageminima is 80 cm while the distance from the load to the first minimum is 30 cm. What are thereflection coefficient and load impedance
- A 3-phase, 132 kV, 50 Hz, and 200 km line has a resistance of 0.0765 ohm per km per phase, inductance of 0.605 mH per km per phase, and shunt admittance is 4.79 nF per km per phase. It delivers 40 MVA at 0.8 power factor lagging. Find the voltage regulation and transmission efficiency. Use nominal n circuit. --------Three single-phase two-winding transformers, each rated 400 MVA, 13.8/ 199.2 kV, with leakagereactance Xeq = 0.10 per unit, are connected to form a three-phase bank. Winding resistances andexciting current are neglected. The high-voltage windings are connected in Y. A three-phase loadoperating under balanced positive-sequence conditions on the high-voltage side absorbs 1000 MVA at0.90 p.f. lagging, with VAN = 199.2 ∠00 kV. Determine the voltage Van at the low-voltage bus if the lowvoltage windings are connecteda) in Y,b)Electrical Engineering The one-line diagram of a four-bus power system is shown below. Reactances are given in per unit on a common MVA base. Transformer Ti and T; have tap settings of 0.8:1, and 1.25:1 respectively. Obtain the bus admittance matrix. j0.2 X = j0.0125 X = j0.16 j0.25 0.8:1 1.25:1 2 3
- Three single-phase two-winding transformers, each rated 400 MVA, 13.8/ 199.2 kV, with leakage reactance Xeq = 0.10 per unit, are connected to form a three-phase bank. Winding resistances and exciting current are neglected. The high-voltage windings are connected in Y. A three-phase load operating under balanced positive-sequence conditions on the high-voltage side absorbs 1000 MVA at 0.90 p.f. lagging, with VAN = 199.2 ∠00 kV. Determine the voltage Van at the low-voltage bus if the low voltage windings are connecteda) in Y,b) in DeltaH. W.: A 3-phase overhead transmission line is being supported by three disc insulators. The potentials across top unit and middle unit are 9 kV and 11 kV respectively. Calculate: oiznoga to gnine A: olqmzd a. The ratio of capacitance between pin and earth to the mutual capacitance of each unit.iu one 2200 utlor oh bnft.9oNDilonge b. The line voltage. c. String efficiency.The single line diagram of a power system is shown below. Load represented as impedance, (13.2) kV voltage It draws 60 MVA power from the system when it is below and (0.9) back power factor. Generators and transformers The related electrical parameters are given below. According to this; a) Calculate all impedances in this given circuit in pu and draw the equivalent impedance diagram of the circuit. (Select the base values as 100 MVA and 13.8 kV.) b) Since the voltage values of the generators are given as E1=1.1∟0° pu and E2=1.25∟10° pu, Calculate the value of the voltage (V1).