harmonics 130307055153-phpapp02
TRANSCRIPT
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HARMONICS
BY IFTEKHAR
E1 - 11213
M.H.S.S.P
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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.
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WHAT CAUSES OF HARMONICS ?
NON-LINEAR LOAD
(CURRENT IS NOT PROPOTIONAL TO VOLTAGE)
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NON-LINEAR LOAD
GRAH SHOWS THE RELATION BETWEEN VOLTAGE & CURRENT
NON-LINEAR LOADS ARE SWITCHED ON ONLY PART OF THE CYCLE.
EG:DIODE , TRANSISTOR , ETC.
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SOURCE OF HARMONICS 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
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WHAT DO HARMONIC DO ?
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.
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EFECT OF HARMONIC ON SUPLY DISORTED VOLTAGE.
OVERHEATED OF TRENSFORMER & MOTOR
HEATING OF NEUTRAL CONDUCTOR.
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EFFECT ON TRANSFORMER 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
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10
Solutions
Power filters .
Isolation transformer .
Line reactors.
Online UPS. HARMONIC CONVERTOR
19-10-2005
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HOW CAN ELIMINATE 6-pulse converter
12-pulse converter
18-pulse converter
note the level of distortionand steep current rise.
the waveform appears moresinusoidal, but still not very smooth.
virtually indistinguishablefrom the source currentwaveform.
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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
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QUESTIONS ?