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Problem 1.A (2 pnts) In a balanced 3-phase circuit, a 3-phase voltage source with negative phase sequence is connected to a three phase load. If the current between the C and B nodes at the load is ſcb = 1202 - 120° Arms what is the line current ſaa? + CC Cm A 2 line Problem 1.B (8 pnts) A balanced 3-phase circuit consists of a Y-connected 3-phase source with negative phase sequence, a delta-connected load, and a 3-phase transmission...
Indicate the phase equation for this circuit. Indicate the
range of phase and phase at low frequency and high frequency. Are
they resistive, capacitive or inductive for each.
Type I Series RLC
Calculate the short circuit current of a 3-phase delta-wye connected transformer if the short circuit occurs between phase A and the neutral at the low voltage side. The transformer is supplied by a 12.5kV line-to-line voltage. The transformer rating is 50kVA, 12.5kV/500V and 9.2% (leakage reactance)
a) Calculate the current IL1, IL2, IL3 and IS in phasor form. (11 marks)
b) Calculate the total real power. (5 marks)
c) Calculate the total reactive power. (5 marks)
d) Calculate the apparent power delivered from the power source. (2 marks)
e) Calculate the overall power factor. (3 marks)
f) A capacitor is connected in parallel with the power source so as to correct the power
factor to 0.95 lagging. Calculate the capacitance of the capacitor. (7 marks)
g)...
A motor circuit is providing 480 volts and 25 amps to a 3-phase motor that is rated at 10 HP. If the utility charged $0.17 per kWh, what was the original cost of operating the motor per hour before correction?
A motor circuit is providing 480 volts and 25 amps to a 3-phase motor that is rated at 10 HP Apparent power =20.784 KVA True Power = 7.46 KW Power Factor = 36 % Reactive Power = 19.4 kVAR What would the apparent power be at 95% power factor? What would the reactive power be at 95% power factor? What is the difference between the two reactive powers? Based on the use of 17 CkVAR of capacitance, what would the...
A motor circuit is providing 480 volts and 25 amps to a 3-phase motor that is rated at 10 HP. What is the apparent power? What is the true power? What is the power factor? What is the reactive power?
A 3 phase, 460V, 60Hz, 6-pole induction motor has the following equivalent circuit parameters per phase: R1 = 0.2 ohms R2 = 0.28 ohms X1 = X2 = 1.055 ohms Xm = 33.9 ohms The no load losses, comprising friction, windage, and iron losses equal 26W. The motor is coupled to a load and connected to a 460V supply, and the rotor speed is found to be 1156 RPM. For this motor connected to a 460V supply calculate the following:...
2. Consider the given 3-phase circuit. Assume the load voltage, PAB = 30L30, Kms (3) Are the loads connected in Wye or Delta configuration? Explain your selection. b. a. (3) Are the sources connected in Wye or Delta configuration? Explain your selection. (5) Draw the single-phase equivalent of the given circuit. Label the line-to-neutral voltage numerically. c. d. (4) Calculate the rms line current phasor in each phase. e. (5) Calculate the rms source voltage phasor in each phase. f...