The impedance Z (100-j75 2) is used in the balanced three-phase circuit below. Find a. IAB, IBC, and ICA b. LaA, IbB, and Icc c. Iba, Icb, and Iac 13.2/-120° kV C + IaA A a + + 13.2/120° kV 13.2/0° kV Z N IbB Ꮓ C b B ICC
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- In order to avoid difficulties with third-harmonic exciting current, which three-phase transformer connection is seldom used for step-up transformers between a generator and a transmission line in power systems. (a) Y- (b) -Y (c) Y-YA 220 Ω resistor is in series with an 80 mH inductor. The AC source is 48 at 1 kHz. The power factor is ________. Hint: Draw the circuit and get Vs and IsThree single-phase transformers are connected in delta-delta to step down a line voltage 138 kV to 80 kV to supply a manufacturing plant. The plant draws an active power of 24 MW at a lagging power factor of 0.89. Calculate apparent power in MVA drawn by the plant.
- A 60 Hz sinusoidal voltage v = 141sinwt is applied to a series RL circuit. The values of the resistance and the inductance are 3 ohms and 0.016 henry respectively. a) Compute the rms value of the current and its phase angle with respect to the voltage.b) write the expression of the instantaneous current.Please Use matrix form in solving this problem. Thank you3. In the following power system, the base voltage in region 2 is 13.8 kV. The transformer reactance is in per unit. The transmission line and load impedance are in Ohms. Zioad = 300 orT K 9eL0 SEto M Z = 10 + j100 N 13.2 kV S MVApri-ssdi diw 10MVA niz 13.24 - 132Y kV X, = 0.1S 138Y - 694 kV X12 = 0.08 Determine the following a. The base complex power in regions 1, 2, and 3 b. Base voltage in regions 1, 2, and 3 c. Base impedance in regions 1, 2 and 3 d. Base current in regions 1, 2 and 3 e. Actual impedance of transformers 1 and 2.
- Two impedances are connected in parallel across a 220-volt source. If Z1= 4 cis (30) and Z2 = 5 cis (60) ohms. Find the equivalent admittance ( Siemen ) of the circuit. O 0.435 cis(- 43.3) O 2.3 cis (43.3) O 0.835 cis (-53.3) O 0.835cis (53.3)A single-phase power system is shown as the equivalent circuit below. The system has a 480V generator connected to an ideal 1:10 step-up transformer (no losses), a transmission line, an ideal 20:1 step-down transformer and a load all in series as shown. The resistance of the transmission line is 20 S2 and the reactance j60 , a load is connected to the system with an impedance of 10/30° №. For the analysis of the system, use base values of 10 kVA and 480 V at the generator, find (a) per unit values of all impedances, (b) per unit current, (c) load power (W), (d) power loss (W). NG 480 20⁰ V 10 kVA Zone 1 1:10 20 Ω j60 Ω ZL Zone 2 20:1 ILoad Zone 3 ZLoad 10/30° ΩQUESTION 11 A single phase 600v/120v transformer has a load of 30 ohms resistive and 20 ohms inductive in series. What is the secondary load impedance with the phase angle? O a. 36.1<33.7 degrees O b. 39.5<38 degrees O c. 30.8<28 degrees O d. 46.2<53 degrees
- What is the ripple voltage in the recufier circuit given below. (Assume that V13V, f-50 Hz, R-120 C 40 mV)? 22V O05V OCT5V 18 Vsino Ca) Derive the formula for total voltage and impedance for series RL circuit. Find the equation of phase shift in terms of voltages and impedances·4.) A three-phase generator operating with a terminal voltage of 115V is connected to a three- phase transformer rated 7.5MVA 115/13.2kV. The transformer has a per-phase series impedance of 0.007+j0.075 pu and is connected to a distribution line with series impedance of 0.02+j0.1 pu per phase on a base of 10MVA, 13.2kV. The line supplies a balanced three-phase load rated 6MVA, 13.2kV with 0.85 lagging power factor. a. Draw and equivalent per phase circuit of the system indicating all impedances in per unit. Use 10MVA, 13.2kV as the base at the load. b. Find the current at the generator in amperes. c. Determine the voltage regulation at the load. 5.) If the transformer of 4.) is connected in A(115)-Y(13.2K), find the phase current of the generator.