Question 1: A voltage source V, is to be connected to a resistive load R₁ = 10 2 by a transmis- sion line having a resis

Post by **answerhappygod** » Fri Jul 01, 2022 6:01 am

: Question 1 A Voltage Source V Is To Be Connected To A Resistive Load R 10 2 By A Transmis Sion Line Having A Resis 1 (34.66 KiB) Viewed 34 times

: Question 1 A Voltage Source V Is To Be Connected To A Resistive Load R 10 2 By A Transmis Sion Line Having A Resis 2 (22.79 KiB) Viewed 34 times

: Question 1 A Voltage Source V Is To Be Connected To A Resistive Load R 10 2 By A Transmis Sion Line Having A Resis 3 (38.3 KiB) Viewed 34 times

Question 1: A voltage source V, is to be connected to a resistive load R₁ = 10 2 by a transmis- sion line having a resistance Rline = 10 £2, as shown in Figure P15.64. In part (a) of the figure, no transformers are used. In part (b) of the figure, one transformer is used to step up the source voltage at the sending end of the line, and another transformer is used to step the voltage back down at the load. For each case, determine the power deliv- ered by the source; the power dissipated in the line resistance; the power delivered to the load; and the efficiency, defined as the power delivered to the load as a percentage of the source power. V₁-100 V rms ( 100 V rms 1:10 000000 000000 Step up Rline=1092 www (a) Rline=1092 www (b) Figure P15.64 ww 10:1 eeeeee Step down R₁ = 100 www R₁ = · 10 Ω
Question 2: A 1000-VA, 230/115-V transformer has been tested to determine its equivalent cir- cuit. The results of the tests are shown below. Open-circuit test (on secondary side) Voc = 115 V loc = 0.11 A Poc = 3.9 W Short-circuit test (on primary side) Vsc = 17.1 V 1sc = 8.7 A Psc = 38.1 W (a) Find the equivalent circuit of this transformer referred to the low-voltage side of the transformer.
Question 3: A 13.8-kV, single-phase generator supplies power to a load through a transmission line. The load's impedance is Z500 36.87°, and the transmission line's im- pedance is Z= 60 2600 VG = 13.840 kV V = 13.820kV2 1:10 T₁ 60L 60°0 602 600 (b) 10:1 500/36.87%2 Zad 500436.872 FIGURE P2-3 Circuits for Problem 2-14: (a) without transformers and (b) with transformers. Z (a) If the generator is directly connected to the load (Figure P2-3a), what is the ra- tio of the load voltage to the generated voltage? What are the transmission losses of the system? (b) What percentage of the power supplied by the source reaches the load (what is the efficiency of the transmission system)? (c) If a 1:10 step-up transformer is placed at the output of the generator and a 10:1 transformer is placed at the load end of the transmission line, what is the new ratio of the load voltage to the generated voltage? What are the transmission losses of the system now? (Note: The transformers may be assumed to be ideal.) (d) What percentage of the power supplied by the source reaches the load now? (e) Compare the efficiencies of the transmission system with and without transformers.