A balanced star-connected load having an impedance (15+j20) ohms per phase is connected to a three-phase, 440 V, 50 Hz supply. Find the line currents and the power absorbed by the load. Assume negative phase sequence
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A balanced star-connected load having an impedance (15+j20) ohms per phase is connected to a three-phase, 440 V, 50 Hz supply. Find the line currents and the power absorbed by the load. Assume negative phase sequence.
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- A balanced three-phase ∆- connected source has a line voltage 120 V. It is connected to a load via a three-wiretransmission line. The per-phase impedance of the ∆-connected load is 30 + j120 Ω. The impedance of each wireof the transmission line is 2 + j4 Ω.How much power is dissipated by the load? How much power is dissipated in transmission line? Power factor of load?(b) Three Impedances each of (10 – j26)Ω are connected in mesh across a three-phase 435V ac supply. Determine the phase current, line current, active power and reactive power drawn from supply. (1)phase current (Ip)? (2)Line current ? (3)real power? (4)reactive power?A 1-phase transmission line has an impedance (4 + 3j ) Ω. Find the power factor of the load for zero voltage regulation?
- Determine the amplitude of the line current in a three-phase system with a line voltage of 207 V that supplies 828 W to Δ-connected load at a lagging PF of 0.55, then find the phase impedance.A balanced three-phase source supplies balanced delta load having 39 angle -40 ohms per phase. The wire connecting the load and the source has a 4ohms resistance each. If the line voltage is 480 V-rms, find the magnitude of the line current.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
- 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?In a balanced abc sequential three-phase star-star connected system, the total power on the line is 650W. If the VAN is 117/15 degrees Vrms, the load has a power factor of 0.88 (forward) and the line impedance is 1 + j2ohm, what is the load impedance?For the single-phase power system below, find the transmission losses in Watts (assume that the transformers are ideal). Hint: Remember that loads can be represented by complex numbers in either rectangular or polar form.
- Two wattmeter’s are connected to measure the input power of a balanced three phase load by two wattmeter method. If the wattmeter readings are W1 = 9200 W and W2= 3100 W and the reverse switch being operated on the meter indicating 3100 W, then the load power factor is given by,A 3-phase 4160 V Y-connected source is rated at 5 MVA. It is connected to a balanced 3-phase delta connected load with 300 A phase current at 0.8 p.f. Determine the impedance of the load, and the source line current and power factor seen by the source. What impedance can be added to the system to make the power factor = 1?A balanced load consists of three coils with each coil having a resistance of 10 Ω and an induction reactance of 15 Ω The load is conneted as star to a 420 V, three-phase, 50 Hz supply as shown in the Figure For abc phase sequence, find (i) the line currents, and (ii) power factor.