Determine the line current
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Determine the line current of a Y-connected balanced three-phase load, consuming 300 kW at power factor = 0.8 lagging and operating at 480 V. Work on PER UNIT with Sbase = 375 kVA and Vbase = 480V. Choose the best answer.
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- A three-phase line with an impedance of (0.2+j1.0)/ phase feeds three balanced three-phase loads connected in parallel. Load 1: Absorbs a total of 150 kW and 120 kvar. Load 2: Delta connected with an impedance of (150j48)/phase. Load 3: 120 kVA at 0.6 PF leading. If the line-to-neutral voltage at the load end of the line is 2000 v (rms), determine the magnitude of the line-to-line voltage at the source end of the line.A 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.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?
- 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 delta-connected load with impedance (25.98 + j15) ohms per phase is connected to a 3-phase, 3-wire, 250-V system by conductors having an impedance of (0.4 + j0.3) ohms per conductor. Find the line to line voltage at the load.A balanced Y-connected load is connected to 3-phase transmission lines with line-to-line voltages of 21.5 kV. The current in each line is 75 A. What are the phase impedances of the Y-connected load?
- A 3 phase 13-KV transmission line delivers 8 MVA of load. The per phase impedance of the line is (0.01 + j 0.05 ) p.u. referred to a 13 – KV, 8 – MVA base. What is the voltage drop across the line?A set of balanced three-phase transmission lines with line-to-line voltages of 13 kV is connected to a balanced wye load with phase impedance of 8 + j3 Ohms. What is the real power delivered to the three-phase load?A load of 140 MW at a power factor of 0.8 lagging can be delivered by a 3-phase transmission line. The voltage at the receiving end is to be maintained at 54 KV and the loss in the transmission is 8 % of the power delivered. (Consider the line to be a short transmission line) Find Single phase Power delivered Per phase voltage Current flowing through the transmission line 3 Phase Losses in the transmission line Per phase resistance of the transmission line
- A single phase transmission line is delivering 490 kVA load at 14 kV. Its resistance is 6 Ω and inductive reactance is 7 Ω if the load power factor is 0.7 lagging. Determine the: A) Current through the line. B) Sending end voltage. C) Sending end power factor. D) Regulation of transmission line. E) Efficiency of transmission line.A 30 kVA, 60% reactive factor three phase balanced load is measured using three-wattmeter method. If the first wattmeter is connected in line 1, second wattmeter in line 2, and third wattmeter in line 3 at a common junction x, calculate the reading in wattmeter 3.A 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