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Seminar Topic on:-
SYMMETRICAL COMPONENT OF POWER
SYSTEMS
Presented By:-
Devendra Mishra
Branch:- EN-1
Roll No:-1401421020
OUTLINE OF THE PRESENTATION
INTRODUCTION
NEED FOR THE SYMMETRICAL
COMPONENET METHOD
TECHINQUES USED TO ANALYSIS
SYMMETR...
INTRODUCTION
A three-phase system is said to be symmetrical when
the system viewed from any phase is similar.
Thus, in a...
This method was proposed by Fortescue in 1981
and is often called the three-component method.
According to Fortescue, An...
PHASE SEQUENCE
Phase-Sequence of the phasors is the order in which
they pass through a positive maximum.
 Thus, a phase ...
The phasor representation of three phase system
Need for the symmetrical
component analysis
Negative sequence relay in generator has helped in
protecting the generator f...
Method of adopted for
symmetrical component analysis
Mathematically:
Va= Va0+ Va1+ Va2
Vb= Vb0+ Vb1+ Vb2
Vc= Vc0+ Vc1+ ...
Vp=A Vs
Then Vs=[ adjA÷|A|] Vp
Symmetrical components of generator
Symmetrical components of
transformer
Conclusion
Power system analysis using symmetrical
component is very helpful in improving the
reliability of the power sy...
Any query
Thank you
symmetrical component of power system
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symmetrical component of power system

  1. 1. Seminar Topic on:- SYMMETRICAL COMPONENT OF POWER SYSTEMS Presented By:- Devendra Mishra Branch:- EN-1 Roll No:-1401421020
  2. 2. OUTLINE OF THE PRESENTATION INTRODUCTION NEED FOR THE SYMMETRICAL COMPONENET METHOD TECHINQUES USED TO ANALYSIS SYMMETRICAL CONCLUSION
  3. 3. INTRODUCTION A three-phase system is said to be symmetrical when the system viewed from any phase is similar. Thus, in a three-phase symmetrical system the impedances of all the three phases are equal and the mutual impedances, if any, between the three phases are the same. The three phase voltages(or currents) are said to be balanced if the magnitude of the three voltages(or currents) are equal and they separated from each other by 120º(electrical) in phase. When the system is unbalance the voltages, current and the phase impedances are in general unequal. Such a system can be solved by a symmetrical per phase technique known as the method of symmertical component.
  4. 4. This method was proposed by Fortescue in 1981 and is often called the three-component method. According to Fortescue, An unbalance set of n phasors may be resolved in to (n-1) balanced n- phase system of different phase sequence and one zero-phase sequence system. A zero-phase sequence system is one in which all phasors are of equal magnitude and identical angle,
  5. 5. PHASE SEQUENCE Phase-Sequence of the phasors is the order in which they pass through a positive maximum.  Thus, a phase sequence a b c implies that the maxima occur in order a, b, c. If a, b, c is taken as the positive phase sequence then a, c, b represents the negative phase sequence. It should be noted that for both positive & negative phase sequence, the direction of rotation of phaser is taken to be anticlockwise
  6. 6. The phasor representation of three phase system
  7. 7. Need for the symmetrical component analysis Negative sequence relay in generator has helped in protecting the generator from over heating in the event of unbalanced loads. The positive sequence network is used to supply the sensing voltage to generator voltage regulators Certain connections of CT and PT develop zero sequence components that are used in protective ground relaying scheme
  8. 8. Method of adopted for symmetrical component analysis Mathematically: Va= Va0+ Va1+ Va2 Vb= Vb0+ Vb1+ Vb2 Vc= Vc0+ Vc1+ Vc2  Va Vb Vc are unbalance set of phasor Va1, VbVc1 are set of positive sequence phasor Va2, Vb2Vc2 are negative sequence phasor Va0 Vb0 Vc0 are zero sequence phasor
  9. 9. Vp=A Vs Then Vs=[ adjA÷|A|] Vp
  10. 10. Symmetrical components of generator
  11. 11. Symmetrical components of transformer
  12. 12. Conclusion Power system analysis using symmetrical component is very helpful in improving the reliability of the power system. The principle adopted for the analysis of unbalanced fault system is symmetrical component method
  13. 13. Any query Thank you

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