Star-Delta Transformation: Converting Y to Delta in Electrical Networks, Slides of Engineering

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STAR DELTA

TRANSFORMATION

Prepared by: zainab ather

contents

Introduction

Definition

 connection

Star delta transformation

Relation between line & phase current

Relation between line &phase voltage

Number of turns

Network type

Star delta transformation in AC

Reference

Definition

Star connection ◦The terminals of the three branches are connected to a common point. The network formed is known as Star Connection Delta connection ◦The three branches of the network are connected in such a way that it forms a closed loop known as Delta Connection

Connection

Star connection ◦ (^) The starting and the finishing point that is the similar ends of the three coils are connected together Delta connection ◦ (^) The end of each coil is connected to the starting point of the other coil that means the opposite terminals of the coils are connected together.

Relation between Line and phase current Star connection ◦Line current is equal to the phase current Delta connection ◦Line current is equal to the root three times of the phase current

Relation between line and phase voltage Star connection ◦Line voltage is equal to root three times of the Phase Voltage Delta connection

◦Line voltage

is equal to the

Phase

voltage.

Network type

Star connection ◦Mainly used in the Power Transmission networks. Delta connection ◦Used in the Power Distribution networks.

STAR DELTA TRANSFORMATION IN AC ◦In AC circuits, impedance is playing the same role, resistance is playing in DC circuits. The complex quantity impedance is the combination of reactance and resistance and reactance is a combination of inductive and capacitive reactance. Fortunately, the above transformation is true for AC circuits having complex impedance instead of resistance.