2. Two balanced 30 loads are connected in parallel across a balanced, 36 positive phase sequence source. The two loads, 1 and 2 respectively connected in wye and delta respectively have impedances of (3+ j0) ohms and (0+ j4) ohms respectively. If the voltage in line a to the neutral of load 1 is 120cis40°, find (a) the line currents of each load; and (b) the total line currents.

2. Two balanced 30 loads are connected in parallel across a balanced, 36 positive phase sequence source. The two loads, 1 and 2 respectively connected in wye and delta respectively have impedances of (3+ j0) ohms and (0+ j4) ohms respectively. If the voltage in line a to the neutral of load 1 is 120cis40°, find (a) the line currents of each load; and (b) the total line currents.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Single Phase AC Circuit

Alternating Current (AC) is a type of electric power in which the electric current changes, both in magnitude and direction, at regular intervals. This AC Circuits can deliver power in either a Single Phase system or a Three Phase system.

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2. Two balanced 30 loads are connected in parallel across a balanced, 30 positive phase sequence
source. The two loads, 1 and 2 respectively connected in wye and delta respectively have impedances
of (3+j0) ohms and (0+ j4) ohms respectively. If the voltage in line a to the neutral of load 1 is
120cis40°, find (a) the line currents of each load; and (b) the total line currents.

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A balanced A-connected load consisting of a pure resistances of 152 per phase is in parallel with a purely resistive balanced Y-connected load of 6 2 per phase as shown in the figure. The combination is connected to a three-phase balanced supply of 346.41-V rms (line-to-line ) via a three-phase line having an inductive reactance of j3 Q per phase Taking the phase voltage Van as reference , determine (a) The current, real power, and reactive power drawn from the supply. (b) The line-to-neutral and the line-to-line voltage of phase a at the combined load terminals. j3 N ao |VL| = 346.41 V 15Ω bo Co
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Three balanced three-phase loads are connected in parallel. Load 1 has a Y connection and an impedance of 400 + j300 Ω per phase, Load 2 has a delta connection with an impedance of 2400 - j1800 Ω per phase and Load 3 is 172.8 + j2203. 2 KVA. The three loads are supplied by a distribution line with an impedance of 2 + j 16 Ω per phase. The magnitude of the neutral line voltage at the end of the line corresponding to the load is 24√3 kV. Calculate the total complex power at the end of the line corresponding to the generator. What percentage of the average power at the end of the line corresponding to the generator is being delivered to the loads?
2. Three Unbalanced loads connected in wye configuration and is impressed by a balance three phase, four-wire source. The per phase voltage of the source is 230V. Assume phase voltage A as reference, determine the line currents Ia, Ib and Ic and the neutral current if the following unbalance loads are: Load an: 30kW at 0.8 lagging power factor Load bn: 50kW at 0.6 lagging power factor Load cn: 30 kW at 0.9 leading power factor.
In a balanced 3-phase wye-connected system with positive-sequence source, the line-to-line voltages are sqrt of 3 times the line-to-neutral voltages and lend by 30 degrees. Is it true or false?