Three Phase Circuits Generation of Single Phase Alternating

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Three Phase Circuits

Three Phase Circuits

Generation of Single Phase Alternating Voltage

Generation of Single Phase Alternating Voltage

Generation of Single Phase Alternating Voltage As the coil rotates further, the rate of

Generation of Single Phase Alternating Voltage As the coil rotates further, the rate of change of flux linkages increases and hence emf induced increases and becomes maximum where = 90 o. From changing between 90 o to 180 o , flux linking with the coil gradually increases, but the rate of change of flux linkages decreases. Hence, emf induced decreases gradually and becomes equal to zero.

Generation of Three Phase Alternating Voltage ü The three sets of coils are mounted

Generation of Three Phase Alternating Voltage ü The three sets of coils are mounted within the slots of a cylindrical structure called armature winding. ü Let us assume that armature is now rotating in anticlockwise direction. ü Since three coils are identical, the maximum values of induced emf in each coil are same and are expressed as: Phase Sequence RYB - anticlockwise rotation Phase Sequence RBY - clockwise rotation

Generation of Three Phase Alternating Voltage

Generation of Three Phase Alternating Voltage

Advantages of Three Phase System over Single Phase System A three phase system is

Advantages of Three Phase System over Single Phase System A three phase system is universally adopted due to following advantages. ü The amount of conductor material required is less for three phase system. ü Three phase induction motors are self starting while single phase motors are not. ü A three phase system can be used for high power transmission using EHV towers. ü The voltage regulation and efficiency is better than single phase system. If three individual loads are connected across three independent phases R, Y and B with neutral wire as the return path, it needs six conductors for the loads to receive power. But in three phase system, this can be accomplished by either three or four wires for balanced and unbalanced loads respectively.

Advantages of Three Phase System over Single Phase System

Advantages of Three Phase System over Single Phase System

Interconnection of Three Phases Star Connection VRY , VYB , VBR are called line

Interconnection of Three Phases Star Connection VRY , VYB , VBR are called line voltages because they are measured between two lines. The line voltage is denoted by VL.

Interconnection of Three Phases Star Connection

Interconnection of Three Phases Star Connection

Interconnection of Three Phases Star Connection

Interconnection of Three Phases Star Connection

Interconnection of Three Phases Star Connection

Interconnection of Three Phases Star Connection

Interconnection of Three Phases Delta or Mesh Connection

Interconnection of Three Phases Delta or Mesh Connection

Interconnection of Three Phases Delta or Mesh Connection

Interconnection of Three Phases Delta or Mesh Connection

Interconnection of Three Phases Delta or Mesh Connection

Interconnection of Three Phases Delta or Mesh Connection

Interconnection of Three Phases Delta or Mesh Connection

Interconnection of Three Phases Delta or Mesh Connection

Chapter 33 Alternating Current Circuits Alternating Current CircuitsChapter 33 Alternating Current Circuits Alternating Current Circuits
THREE PHASE CIRCUITS Generation of Three Phase FigTHREE PHASE CIRCUITS Generation of Three Phase Fig
Chapter23 Alternating Current Circuits Alternating Signal The rmsChapter23 Alternating Current Circuits Alternating Signal The rms
Chapter23 Alternating Current Circuits Alternating Signal The rmsChapter23 Alternating Current Circuits Alternating Signal The rms
Single Loop Circuits 2 3 Single NodePair CircuitsSingle Loop Circuits 2 3 Single NodePair Circuits
THREE PHASE SYSTEM Introduction Single Phase and ThreeTHREE PHASE SYSTEM Introduction Single Phase and Three
AC Circuits Alternating Current Direct current DC circuitsAC Circuits Alternating Current Direct current DC circuits
Chapter23 Alternating Current Circuits AC Circuits All theChapter23 Alternating Current Circuits AC Circuits All the
Chapter23 Alternating Current AC Circuits AC circuits areChapter23 Alternating Current AC Circuits AC circuits are
Chapter23 Alternating Current AC Circuits AC circuits areChapter23 Alternating Current AC Circuits AC circuits are
Chapter 33 Alternating Current Circuits AC Circuits nChapter 33 Alternating Current Circuits AC Circuits n
Chapter 33 Alternating Current Circuits AC Circuits lChapter 33 Alternating Current Circuits AC Circuits l
AC Circuits Alternating Current Circuits Why AC powerAC Circuits Alternating Current Circuits Why AC power
Alternating Currents An alternating current such as thatAlternating Currents An alternating current such as that
11 5 Alternating series An alternating series has11 5 Alternating series An alternating series has