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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 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...
A 3-phase circuit is shown in figure below. Load resistors (66 ?) are connected in delta and supplied by a 220-Vrms (line-to-line) balanced three-phase source through three lines of 2-ohm resistance. Determine the magnitude of the root-mean-square, line-to- line voltage across each 66-ohm resistor. 212 66 ? 2? O a 110 V ob, 120 V , 198 V O d. 200 V O e.202 V
EEE145 Q3 1) Given the 3-phase circuit on the board, draw the connections for the CT and PTs and connect them to the relay. Connect the relays wye primary, wye secondary.
Problem 3: The line-to-neutral voltage at the terminals of the balanced three-phase load in the circuit shown in Fig. 3 is 1200V. At this voltage, the load is absorbing 500kVA at 0.96 pf lag. a) Use Van as the reference and express Ina in the polar form. b) Calculate the complex power associated with the ideal three-phase source. c) Check that the total average power delivered equals the total average power absorbed. d) Check that the total magnetizing reactive power...