BY IFTEKHAR   E1 - 11213    M.H.S.S.P
WHAT IS HARMONICS?   “A COMPONENT FREQUENCY OF A HARMONIC MOTION    OF AN ELECTRO MAGNETIC WAVE I.E AN INTEGRAL    MULTIP...
WHAT CAUSES OFHARMONICS ?             NON-LINEAR LOAD    (CURRENT IS NOT PROPOTIONAL TO VOLTAGE)
NON-LINEAR LOAD   NON-LINEAR LOADS ARE    SWITCHED ON ONLY PART    OF THE CYCLE.    EG:DIODE ,       TRANSISTOR , ETC.   ...
EFFECT OF HARMONIC ON WAVEFORM
SOURCE OFHARMONICS   Converters,   Devices which includes semi-conductor elements,   Generators,   Motors,   Computer...
WHAT DO HARMONICDO ?   HARMONIC ARE CARRIED THROUGH THE SYSTEM    FROM THE SOURCE CAN BE NEARLY DOUBLE THE    AMOUNT OF C...
EFECT OF HARMONIC ONSUPLY   DISORTED VOLTAGE. OVERHEATED OF TRENSFORMER &  MOTOR HEATING OF NEUTRAL CONDUCTOR.
EFFECT ONTRANSFORMER   Transformer overheating and potential    insulation failure result from several     conditions cau...
Solutions       Power filters .       Isolation transformer .       Line reactors.       Online UPS.      HARMONIC CONVERT...
HOW CAN ELIMINATE6-pulse converter           note the level of distortion           and steep current rise.12-pulse conver...
CONCLUSION The harmonic distortion principally  comes from Nonlinear-Type Loads. The application of power  electronics i...
QUESTIONS?
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Harmonics

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Harmonics

  1. 1. BY IFTEKHAR E1 - 11213 M.H.S.S.P
  2. 2. WHAT IS HARMONICS? “A COMPONENT FREQUENCY OF A HARMONIC MOTION OF AN ELECTRO MAGNETIC WAVE I.E AN INTEGRAL MULTIPLE OF FUNDAMENTAL FREQUENCY”. US FUNDAMENTAL FREQUENCY ARE 50Hz.
  3. 3. WHAT CAUSES OFHARMONICS ? NON-LINEAR LOAD (CURRENT IS NOT PROPOTIONAL TO VOLTAGE)
  4. 4. NON-LINEAR LOAD NON-LINEAR LOADS ARE SWITCHED ON ONLY PART OF THE CYCLE. EG:DIODE , TRANSISTOR , ETC. GRAH SHOWS THE RELATION BETWEEN VOLTAGE & CURRENT
  5. 5. EFFECT OF HARMONIC ON WAVEFORM
  6. 6. SOURCE OFHARMONICS Converters, Devices which includes semi-conductor elements, Generators, Motors, Computers, Electronic ballasts, Switching power supplies, Welding machines, Control circuits, HVDC transmission systems, Electrical Communication systems. Transformers
  7. 7. WHAT DO HARMONICDO ? HARMONIC ARE CARRIED THROUGH THE SYSTEM FROM THE SOURCE CAN BE NEARLY DOUBLE THE AMOUNT OF CURRENTON THE NEUTRAL CONDUCTOR IN 3 PHASE 4 WIRE DISTRIBUTION SYSTEM. OVERALL ELECTRICAL SYSTEM & POWER QUALITYIS AFFECTED BY THE HARMONICS.
  8. 8. EFECT OF HARMONIC ONSUPLY DISORTED VOLTAGE. OVERHEATED OF TRENSFORMER & MOTOR HEATING OF NEUTRAL CONDUCTOR.
  9. 9. EFFECT ONTRANSFORMER Transformer overheating and potential insulation failure result from several conditions caused by harmonics:  Increased skin and proximity effects  Harmonics circulating in the primary winding  Increased hysteresis losses  Increased eddy current losses
  10. 10. Solutions Power filters . Isolation transformer . Line reactors. Online UPS. HARMONIC CONVERTOR19-10-2005 10
  11. 11. HOW CAN ELIMINATE6-pulse converter note the level of distortion and steep current rise.12-pulse converter the waveform appears more sinusoidal, but still not very smooth.18-pulse converter virtually indistinguishable from the source current waveform.
  12. 12. CONCLUSION The harmonic distortion principally comes from Nonlinear-Type Loads. The application of power electronics is causing increased level of harmonics due to Switching!! Harmonic distortion can cause serious Failure/Damage problems
  13. 13. QUESTIONS?
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