Page 753 - Basic Electrical Engineering

10

Synchronous Machines

TOPICS DISCUSSED

Constructional details of synchronous machines
Armature winding
Induced EMF
Distribution factor and pitch factor
Open circuit and short-circuit tests
Synchronous impedance
Armature reaction
Voltage regulation
Parallel operation of synchronous generators
Synchronous motors
Effect of change of excitation of synchronous motors
Applications

10.1 INTRODUCTION

Electricity is generated in power houses. The source of energy which is

converted into electrical energy could be potential energy of water, energy of
high pressure steam, or gas. In an hydroelectric power house, say in Bhakra

Dam power house, water head has been created by constructing a high-rise
dam over the river Sutlej. The potential energy of water is utilized in running

a number of water turbines located at the base of the dam. Large capacity ac
generators are coupled with these turbines. When the turbines rotate,
electricity is generated in the ac generators which is brought out through wire