Power Systems II

By admin

Published: June 20, 2010

Introduction
(a) Electric power systems are :
I. Interconnected A.C Networks
II. Isolated AC Networks
III.
(b) Comprising :
I. Generators
II. Transformers
III. Transmission Lines
IV. Loads
(c) Power System Operation
I. Rate of Power flow is controlled by switching circuit breakers
II. Control of power flow is achieved by adjustment of transformers turns ratio, machine excitation and steam input to turbines.
(d) Power System Function
I. Provide a sinusoidal supply of constant voltage and frequency with in specified limits
II. Marinating continuity of supply against faults occurring in the network
(e) Expectations
I. Domestic Single phase supplies
II. A.C furnaces
III. Three Phase core type transformer , 3 limb 5 limb have non identical magnetizing circuit
IV. Transmission lines equilateral spacing is not practical to minimize unbalance by transposition
(f) Single Line Diagram