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Answer Posted / javad ahamad
before 1960 actually harmonics was very little.but todays world we have so many electronics equipments like computer, tv,washing machines ect...these equipments draw some more current for short interval of time.therefore the actual sinusoidal wave hasbeen changed for that time.this is happen in all the distribution system.it s the odd multiple of fundamental wave,like 3rd harmonic,5th harmonic ect...we r using harmonic filter to avoid it..
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