PART 1
GENERAL
INFORMATION
GP Series Portable Generators
Page 9
TABLE OF CONTENTS
PART TITLE PAGE
1.1 Generator Fundamentals 10
1.2 Measuring Electricity 13
1.3 Brushless, Capacitor Excitation
System
16
1.4 Brushed Excitation System 18
1.5 Testing, Cleaning and Drying 20
Part 1 – General Information .................................. 9
Section 1.1 – Generator Fundamentals ................ 10
Magnetism .......................................................10
Electromagnetic Fields.....................................10
Electromagnetic Induction................................10
A Simple AC Generator ...................................11
A More Sophisticated AC Generator ................11
Section 1.2 – Measuring Electricity ....................... 13
Meters ............................................................13
The VOM ..........................................................13
Measuring AC Voltage .....................................13
Measuring DC Voltage .....................................13
Measuring AC Frequency ................................13
Measuring Current ...........................................14
Measuring Resistance .....................................14
Electrical Units .................................................15
Ohm's Law .......................................................15
Section 1.3 – Brushless, Capacitor
Excitation System ............................ 16
Introduction ......................................................16
Stator Assembly ...............................................16
Rotor Assembly ................................................16
Circuit Breakers ...............................................16
Operation .........................................................17
Section 1.4 – Brushed Excitation System ............. 18
Introduction ......................................................18
Stator Assembly ...............................................18
Brush Holder and Brushes ...............................18
Rotor Residual Magnetism...............................18
Voltage Regulator ............................................18
Operation .........................................................18
Section 1.5 – Testing, Cleaning and Drying .......... 20
Insulation Resistance .......................................20
The Megohmmeter...........................................20
Stator Insulation Resistance Test .....................20
Cleaning the Generator ....................................21
Drying the Generator .......................................21
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