Electricity 3 : 3-phase alternating current the public mains, motors, safety

Electricity 3 3-phase alternating current A translation of the Swedish version entitled 3-fas växelström 3 - phase concepts are explained step-by-step, aiming to give the reader ability of electric thinking and methods for analysis and calculations. Formulas and maths are explained thoroughly to make also unaccustomed mathematicians to feel comfortable. A balanced number of test-yourself exercises are included. The book ends with a summary of DC and 1-phase theory for rehearsing and as reference. More information: www.revma.se Email contact with the author: s-b@revma.se Content 3 Briefly about this book A basic circuit 4 Public mains 5 Neutral point TN-C, 4-conductor system TN-S, 5-conductor system 6 Voltages at the consumer side Ratio between main and phase voltage Period and frequency 7 1-phase socket 3-phase socket Junction boxes 8 1-phase and 2-phase loads 9 3-phase 3-phase Y-loads 3-phase D- loads 10 Test-yourself-1 Test-yourself-2 11 Test-you-Self-3 12 Build a 3-phase grid 13 Connections in lighting circuits 14 Installation of lighting circuits Test-yourself-4 15 Installation exercise 16 Electric motors Poles in asynchronous motors 17 Asynchronous motor speed Test-yourself-5 18 The Stator windings Y-coupled motor D-coupled motor 19 Checking the stator windings How to measure? Test-yourself-6 20 Direction of rotation Motor nameplate 21 Efficiency Starting current 22 Motor protections Fuses Overload protection Low voltage protection Motor starters Assembly 23 Direct start Hand-operated motor starter 24 Test-yourself-7 25 Contactor-operated motor starter 26 Start Stop 27 Test-yourself-8 28 Low voltage protection Overload protection Setting of the overload protection Function test 29 Test-yourself-9 Test-yourself-10 Reduced starting current with Y/D-start 30 Frequency converter Motor with AC drive Test-yourself-11 31 1-phase operation of 3-phase asynchronous motor 32 Direction of rotation Test-yourself-12 32 Single phase motor Universal motor Test-yourself-13 33 3-phase generators 3-phase system or three 1-phase circuits 34 Y-connected load with neutral wire Y-connected load without zero wire 35 Voltage and current in 3-phase loads Power in 3-phase loads 36 Apparent power in 3-phase resistive load Active power in inductive 3-phase load 37 Test-yourself-14 38 Electric safety Ground Best Protection Protective ground 40 Test-yourself-15 Double insulated electrical appliances 41 Fuses 42 Residual current device RCD 43 Simple RCD test equipment 44 Low safe voltage 44 Legislation Qualifications CE-marking National Electrical Safety Board 45 Summary of DC and AC theory 58 Key to Test-your self