Problem 1 A 3-phase, star-connected alternator generates 6,360 V per phase and supplies 500 kW at a p.f. 0.9 lagging to a load through a step-down transformer of turns 40: 1. The transformer is delta connected on the primary side and star-connected on the secondary side. Calculate a) the value of the line volts at the load. b) the current in alternator windings c) The current in transformer primary windings d) The current in transformer secondary windings

Problem 1 A 3-phase, star-connected alternator generates 6,360 V per phase and supplies 500 kW at a p.f. 0.9 lagging to a load through a step-down transformer of turns 40: 1. The transformer is delta connected on the primary side and star-connected on the secondary side. Calculate a) the value of the line volts at the load. b) the current in alternator windings c) The current in transformer primary windings d) The current in transformer secondary windings

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...

See similar textbooks

Similar questions

i need the answer quickly
Three single phase transformers each having a 240 V primary and two 250 V secondaries, as shown in the figure below, is to be connected to a 400 V, 3–phase supply to give a six phase output. A d e В f Show how this is done and find the voltage between adjacent phases of the 6-phase output.
If a 3-phase short circuit occurs at the terminals of an alternator, the current in the armature circuit increases suddenly to a large value. Select one: True False
A Wye-Delta transformer is connected to a 66 kV input three-phase transmission line. Each transformer is rated at 1000 kVA and has a step-down ratio of 8:1. The bank supplies a balance load having a power factor of 0.8 lag with a load current of 70 A. Assume ideal transformer, determine. a. The primary line and phase voltages b. The secondary line and phase voltages c. The secondary line and phase currents d. The apparent and active power at the load e. Total kVA capacity of the transformer
In the transformer circuit below, a load of 2.5cis20° Ohms is connected to the output terminals of the transformer. If the voltage across the load is 230V, determine:a. Load current, I(L)b. Imc. Icd. Source voltage, V
A load of 1600 kW at 0-8 p.f. is shared by two 1000 kVA transformers having equal turn ratios and connected in parallel on their primary and secondary side. The full load resistance drop is 1% and reactive drop is 6% in one of the transformers, the corresponding values in the other transformer being 1.5% and 5%. Calculate the power and power factor at which each transformer is operating.
8. The two winding transformer and the autotransformer of the circuit shown in Figure are ideal. Determine the conducting and transformed currents of auto transformer. N1=200 NBC=20 N2=100 NBA=30 10A B 200 V 50,Hz C N1: N2
Two transformersA and B are connected in parallel to a load of (2+j1.5) ohm.Their impedances in Secondary terms ZA = (0.15+j0.8) ohm and Zb = (0.1+j30.6)ohm Their no-load termind voltages are EA=200<0 V and EB=210<0 Volt.Find the power and Power factor of each transformer? %3D %3D
If a 50-turn transformer winding has a 120-V rms applied voltage, and if the peak coupling flux is 20 mWb, find the frequency of the applied voltage.
In Transformers: a. What is the relationship between the turns ratio and the primary to secondarycurrent ratio ? b. What is the relationship between the turns ratio and the primary and secondaryvoltage ratio? c. What can you conclude about the relationship in the values of primary andsecondary apparent power?
1. Three 1-phase transformers, connected delta-delta, supply a balanced 3-phase load of 1200 kW at 4400 V at 0.8 p.f. lagging. Transformers are supplied from 3- phase mains at 11000 V. Find the currents in the primary and secondary winding of the transformer. 2. When the transformer is supplied at 400 V, 50-hz the hysteresis loss is found to be 300 W and eddy current loss is 250 W. Determine the eddy current loss when the transformer is supplied at 800 V, 100-hz.