. A 234-V, 30 source serves a balanced load consisting of three equal impedances, each of which has a esistance of 3.6 N and an inductive reactance of j4.8 N. Calculate the line currents and the total power actor if the impedances are connected in star.
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- Two balanced Y-connected loads, one drawing 10 kW at 0.8 power factor lagging and the other IS kW at 0.9 power factor leading, are connected in parallel and supplied by a balanced three-phase Y-connected, 480-V source. (a) Determine the source current. (b) If the load neutrals are connected to the source neutral by a zero-ohm neutral wire through an ammeter, what will the ammeter read?Consider a three-phase Y-connected source feeding a balanced- load. The phasor sum of the line currents as well as the neutral current are always zero. (a) True (b) FalseA balanced three-phase 240-V source supplies a balanced three-phase Load. If the line current IA is measured to be 15 A and is in phase with the line-to-line voltage, VBC, find the per-phase load impedance if the load is (a) Y-connected, (b) -conneeted.
- For the Y-Δ network in figure below, (a) generate three single-phase equivalent circuits and (b) determine the complex power supplied by the three-phase sourceThe total power supplied to a balanced delta-load is additive and such is the same as in a wye-connected load. True FalseA balanced, positive-sequence, Y-connected voltage source with Eab = 480∠0o volts is applied to abalanced-∆ load with Z∆ = 30 ∠40o Ω. The line impedance between the source and load is ZL = 1 ∠850 Ω.for each phase. Calculate the line currents, the ∆ -load currents, and the voltages at the load terminals.Recall that ZY = Z∆/3
- In the figure, the circuit is given as VRS =√3 . 60V and Zy = 6 + j8. Find the value of C to be connected in order to make the power drawn from the system in a phase 1, to make the load current 1, and to make cos(φ) 1.4) State the relation between line and phase values of voltage and current for 3-pha se DELTA connected load .state the equation for active, reactive power consumed by 3-phase load.a) A 415 V mains supplies a star-connected load at 50 Hz. Each branch of the load is a resistor of 24 Ω. Using 415 V and 20kVA bases calculate the following:i) Base impedance [EV3]ii) Base current [EV3]iii) Per unit load resistance [EV3]iv) Per unit current [EV6]v) Per unit power [EV3] b) Statei. Two advantages of per unit notation [AP4]ii. Three advantages of three phase system over single phase system [AP3]
- For a 208 V three-phase balanced system shown below. Find:1) The line current iL.2) The voltages vAN and vAB3) Real, reactive and apparent power of the load4) Power factor of the loadPlease show full detailed steps.A balanced delta-connected load has phase impedances of 4+j3 Ohms. It is connected to balanced transmission lines, with Vab = 1.5kV @ 15 degrees. a) What is the current through each of the load phases? b) What is the current through each of the transmission lines? c) Which ACSR cable should be used for these transmission lines to give a 20% current rating margin for this load?A balanced three-phase star-connected R-C load of 145 kW takes a current of 54 A with a line voltage of 900 V, 50 Hz. Find the circuit constants of the load per phase. Impedance, Power factor , Resistance