Motors as Generators for Micro Hydro Power

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ISBN: 9781853396458 | 1853396451
Cover: Paperback
Copyright: 3/30/2008

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This guide to the use of induction motors for electricity generation in remote locations has been rewritten as a practical handbook for engineers and technicians involved in designing and installing small water power schemes for isolated houses and communities.

Figures	p. viii
Tables	p. x
Acknowledgements	p. xi
Preface	p. xiii
Introduction	p. xv
Disclaimer	p. xvii
Advantages and disadvantages of induction generators	p. 1
Advantages	p. 1
Disadvantages	p. 2
Induction machine construction and operation	p. 3
Construction	p. 3
Operation	p. 3
Induction motor operation	p. 3
Supply-connected induction generator operation	p. 5
Stand-alone induction generator operation	p. 5
Selection of an induction motor for use as a generator	p. 11
Rotor type	p. 11
Site conditions	p. 11
Lubrication	p. 12
Frame type	p. 13
Insulation and temperature rise	p. 13
Efficiency	p. 16
Power rating	p. 16
Voltage rating	p. 18
Speed rating/drive arrangement	p. 20
Excitation capacitor requirements	p. 23
Voltage and current relationships in three-phase circuits	p. 23
Capacitor connection	p. 23
Selection of capacitors	p. 24
Determining excitation capacitance by testing	p. 25
Calculation of excitation capacitance	p. 26
Operating voltage and frequency	p. 31
Operating voltage	p. 31
Operating frequency	p. 32
Using the operating voltage and frequency to advantage	p. 34
The effect of load upon generator output	p. 37
Resistive load	p. 37
Inductive load	p. 39
Capactitive load	p. 39
Single-phase output from a three-phase machine	p. 41
Power output test	p. 42
Winding currents test	p. 43
Protection, safety and earthing	p. 45
Generator overcurrent protection	p. 45
Generator overspeed protection	p. 46
Safety and earthing	p. 47
Fixed and variable load systems	p. 49
Fixed load systems	p. 49
Variable load systems	p. 50
Controller options	p. 52
Motor starting	p. 57
Techniques for improving motor starting	p. 57
Generator commissioning	p. 63
Safety	p. 63
Excitation	p. 63
Output frequency and power	p. 63
Phase rotation	p. 64
Output stability	p. 64
Adjustment for maximum efficiency	p. 64
Mains-connected systems	p. 65
Mains connection process	p. 65
Loss of mains protection	p. 66
Reverse power trip	p. 66
Three-phase circuit theory	p. 67
Line and phase quantities	p. 67
Voltage and current relationships	p. 68
Power and power factor	p. 68
Induction generator efficiency	p. 73
Single transformer systems	p. 79
Halving the operating voltage of an induction machine	p. 81
Overvoltage trip	p. 83
Power factor correction for motor starting	p. 87
Index	p. 91
Table of Contents provided by Ingram. All Rights Reserved.

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Motors as Generators for Micro Hydro Power

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Motors as Generators for Micro Hydro Power

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