v
TABLE OF CONTENTS
LIST OF FIGURES..................................................................................... ix
LIST OF TABLES...................................................................................... xv
Chapter 1 Introduction ..........................................................................................................1
1.1
Problem statement .....................................................................................................1
1.2
Outline .......................................................................................................................2
1.3
Background ................................................................................................................2
Chapter 2 Prior Work ............................................................................................................6
2.1
Stress Assessment of Induction Motors.....................................................................6
2.2
Power Supply Disturbances .......................................................................................7
2.3
Experimental Studies .................................................................................................7
2.4
Analytical Studies ....................................................................................................12
2.4.1
Solutions Using the dq0 Frame ........................................................................12
2.4.2
Solutions Using the abc Frame ........................................................................18
2.5
Standards..................................................................................................................21
2.5.1
NEMA MG1 - Motors and Generators ............................................................21
2.5.2
ANSI / IEEE C37.96 - Guide for AC Motor Protection..................................23
2.5.3
ANSI C50.41 Polyphase Induction Motors for Power Generating Stations 23
2.5.4
ANSI / IEEE C37.92 Guide for Induction Motor Protection .......................25
2.5.5
Summary..........................................................................................................26
Chapter 3 Experimental Based Stress Assessment of Single Motors ...............................28
3.1
Power Disturbance Generator ..................................................................................28
3.1.1
Block Diagram.................................................................................................28
3.1.2
Operation .........................................................................................................30
3.2
Preliminary Experimental Work ..............................................................................33
3.2.1
Mechanical Configuration ...............................................................................33
3.2.2
Electrical Configuration...................................................................................34
3.2.3
Experimental Test Plan....................................................................................35
3.2.4
Experimental Test Results ...............................................................................36
3.2.4.1 Worst Case Shaft Torque .............................................................................36