Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
When a sinusoidal (single-phase) voltage is applied to a winding, the magnetic field produced by the resultant current flow will also be sinusoidally varying with respect to time.
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
The synchronous motor is one type of 3-phase AC motors which operates at a constant speed from no-load to full load.
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
Where again, VL is the line-to-line voltage, and VP is the phase-to-neutral voltage on either the primary or the secondary side.
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
A three phase transformer has three sets of primary and secondary windings.
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
The primary and secondary windings of a transformer can be connected in different configuration as shown to meet practically any requirement.
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
Its cost is low, less wieght.It can be transported easily.The core will be of smaller size and the material required for the core is less.
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
Usually large scale generation of electrical power used 3 phase voltages of 13.3 kV or some what higher.
Single Phase Transformer
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
Performance of a transformer can be calculated on the basis of its equivalent circuit which contains four main parameter, the equivalent resistance 'Ro1' as referred to primary and 'Ro2' referred as secondary
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
The transformer is a static device, there are no friction (or) windage losses. Then losses occurs are (i) Core (or) iron loss,(ii) Copper loss
with Solved Example Problems
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
We assumed an ideal transformer, that is there were no core losses and copper loses. But practical conditions require that certain modifications be made in the forgoing theory
with Solved Example Problems | Single Phase Transformer
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
E2/E1 = N2/N1 = K.This constant K is known as voltage transformation ratio.
Subject and UNIT: Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
The primary winding of a transformer excited by alternating voltage V1, it produce an alternating flux ϕ.