2.A 3-phase motor having a star connected rotor has an induced emf of 150 volts between slip rings at standstill on open circuit. The rotor has a resistance and reactance per phase of 2 22 and 8 2 respectively. Calculate current per phase and power factor when (i) Slip rings are short circuited (ii) slip rings are connected to a star connected rheostat of 8 92 per phase
2.A 3-phase motor having a star connected rotor has an induced emf of 150 volts between slip rings at standstill on open circuit. The rotor has a resistance and reactance per phase of 2 22 and 8 2 respectively. Calculate current per phase and power factor when (i) Slip rings are short circuited (ii) slip rings are connected to a star connected rheostat of 8 92 per phase
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...
Related questions
Question
Transcribed Image Text:**Problem Statement:**
A 3-phase motor having a star-connected rotor has an induced EMF of 150 volts between slip rings at standstill on an open circuit. The rotor has a resistance and reactance per phase of 2 Ω and 8 Ω, respectively. Calculate the current per phase and power factor when:
(i) Slip rings are short-circuited.
(ii) Slip rings are connected to a star-connected rheostat of 8 Ω per phase.
**Solution Approach:**
- For part (i), the calculation involves using the rotor's resistance and reactance to determine the current when the slip rings are short-circuited.
- For part (ii), the external resistance from the rheostat is included in the calculations, affecting both the current and power factor.
**Diagrams or Graphs:**
- Since this text does not contain any visuals, diagrams such as phasor diagrams or equivalent circuit diagrams would typically help illustrate the concepts of rotor circuits, equivalent impedances, and power factors in educational material. However, no specific diagrams are provided in the text.
Expert Solution
Step 1
Given that:
- The 3-phase motor has star connected rotor
- Induced EMF 150 V at a standstill on an open circuit.
- Rotor resistance, R2= 2 ohm per phase.
- Rotor reactance, X2= 8 ohm per phase.
Find current per phase and power factor when
- Slip rings are short-circuited.
- A star rheostat having 8 ohms per phase is connected to star rings.
Step by step
Solved in 2 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:
9780078028229
Author:
Charles K Alexander, Matthew Sadiku
Publisher:
McGraw-Hill Education
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:
9780134746968
Author:
James W. Nilsson, Susan Riedel
Publisher:
PEARSON
Engineering Electromagnetics
Electrical Engineering
ISBN:
9780078028151
Author:
Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:
Mcgraw-hill Education,