h Dnd the single-phase load produce an unbalance? C Yes No REVIEW QUESTIONS 1. Explain why...
can you calculate this question and explain why? thanks 1. A 250-kVA, 11000/2200-V, 50-Hz, single-phase transformer has the following parameters: RI 1.3 , R2 0.05 , Rel 193 k2, X1 4.5 Q X2 0.16 2 I,- 80 kQ Xml (a) Draw the approximate equivalent circuit of the transformer showing all the circuit parameters referred to the low-voltage side. Use the approximate equivalent circuit to calculate the input voltage and voltage regulation of the transformer when it delivers full load at...
Problem 4 Three ideal single-phase transformers are connected in a delta/wye configuration with the primary side of the three-phase transformer rated at 120 kV and the secondary side rated at 13.8 kV. The rated power of the transformer bank is 20 MVA. One side of the transformer bank is connected to a 120 kV transmission line, and the other side is connected to a three-phase load of 15 MVA at 0.85 lagging power factor. Compute the following: a) The turns...
A 240V three phase power system supplies two loads in parallel: Load 1: measured line current 30A, power factor 0.85 lagging, and Load 2: measured power 10kW, reactive power -7.5kVar A. Determine the power factor of load 2. B. Determine the total real power (in kW), reactive power (in kVAR), apparent power (in kVA), power factor and line current (in A) of the two loads.
1. A six pole, 240V, 50 Hz three phase squirrel-cage induction motor has a no-load speed of 103 rad/s and a speed regulation of 5% at rated load. Find the amount of slip (in rpm) at full load for this motor. 2.. A 2 HP, 240 VAC, 60 Hz, capacitor-start motor is 75% efficient and draws 10 A at full load. What is this motor's power factor at rated load? 3. A wound rotor, 3 phase induction motor in Mr....
1, Two balanced three-phase loads are in parallel. Load 1 draws 10 kW at 0.8 PF lagging Load 2 draws 20 kVA at 0.6 PF leading a. b. The loads are supplied by a balanced three-phase 480 Vu source. (a) Draw the power triangle for the combined load. (b) Determine PF of the combined load. (c) Determine the magnitude of the line current from the source. (d) Y-connected inductors are now installed in parallel with the combined load. What value...
(4) Three single-phase AC loads draw power from the same 12020으 kms source. Load 1 draws 120 w at a lagging PF of 0.75, Load 2 draws 75 VA at a leading PF of 0.6 and Load 3 draws 100 VA at a leading PF of 0.8. Determine the complex power consumed by each load. Calculate the rms current phasor for each load. a. b.
b) The load connected to a three-phase supply comprises three similar coils connected in star. If the phase currents are 10A and the total active power and power factor absorb by the loads are 3kW and 0.8 lagging, respectively. Find: i. The magnitude of phase and line voltages (4 marks) ii. Total apparent power (1 mark) iii. The impedance of each coil. (2 marks) c) If the coil in Q3(b) are now connected in delta to the same three-phase supply,...
A 60-Hz single-phase AC power network is shown in the figure below with four different loads. The source voltage ES-320 0. Prior to adding the capacitor load for power factor correction, the source current IS-135 30 . Determine the capacitance (in μF) of the capacitive load that will make the power factor unity (pf 1.0) of the system. Enter the one best answer (as a number without the units) from the following choices: Sync 74 % 6 15 kVA 10...
1 A single phase AC system Consider a single phase AC distribution system in which there a single home connected to a 10kVA service transformer. Let’s assume that the primary of the distribution transformer can be modeled as an ideal 240V (rms) AC source and that the effective impedance of the transformer is 2% resistance and 3% reactance. (See lecture notes for converting % to Ohms). Connected to the secondary of the transformer is 200 ft of #6 AWG aluminum...
A 113 km, single-circuit, three-phase line consists of z = 0.546∠67.53° W/km and y=3.212∠90° μS/ km. The line delivers a load of 60 MW at 230 kV with 0.8 power-factor lagging. If the above transmission line in Problem 3 has a length of 350 km and still delivers the same load at the rated voltage (230 kV). a) Find the voltage, current, real and reactive power, and the power factor at the sending end in both per unit and absolute...