copy and paste this google map to your website or blog!
Press copy button and paste into your blog or website.
(Please switch to 'HTML' mode when posting into your blog. Examples: WordPress Example, Blogger Example)
Input Form:Deal with this potential dealer,buyer,seller,supplier,manufacturer,exporter,importer
(Any information to deal,buy, sell, quote for products or service)
What exactly are harmonics and how do they appear? The blue sine which shows 1 period is the fundamental Then there's the third harmonic (square waves don't have even harmonics), the purple one Its amplitude is 1 3 of the fundamental, and you can see it's three times the fundamental's frequency, because it shows 3 periods Same for the fifth harmonic (brown)
How do I calculate THD? - Electrical Engineering Stack Exchange Of course, after a certain index of harmonic the THD measurement will not change much, but that depends on the frequency content or the original signal itself, and also your accuracy requirement So it's up to you i e you can start with up to 10th harmonic and calculate the THD, then up to 11th to see if it changes much, etc Instead,
Help me understand FFT and harmonic distortions - Electrical . . . I'm new to FFT and harmonic distortions I'm dealing with a power system where the phase currents are distorted Now I don't understand the concept of FFT and why the harmonics seen in FFT relate to the current waveforms FFT shows how the current waveform changes in gain by frequency instead of time
signal - Harmonic detection using lock-in amplifier - Electrical . . . Since lock-in amplifiers are non-harmonically sensitive , you can obtain better performance using Type I PLL harmonic mixers with the BW of the loop filter needed to reject the adjacent fundamental above the 3f harmonic by more than 40 dB which implies at -6dB octave of -12dB from 1f to 3f at least a 3rd order to 7th order high pass , 1f
failure - Harmonics are bad. . . But how bad? - Electrical Engineering . . . Compatibility levels: Equipment is designed to tolerate be immune to harmonic distortion up to some level, the compatibility level If we can keep the power system harmonic levels below the compatibility levels, the equipment will work (The compatibility levels are defined in IEC 61000 2 2 and IEC 61000 2 12 )
Why dont we use the third harmonic in power transmission? If each conductor carries a 3rd harmonic, and each current is 120° phase shifted from its companion, then regardless of the relative phase of fundamental and harmonic, the phase of the 3rd harmonic is (120°) × 3 = 360° = 0° That is, if we insist that each wire has the same waveform (a symmetry condition), then all harmonic currents will
What is the best approach for reducing harmonic distortion? Robert, Nonlinear loads would introduce odd harmonics in current (mainly 3rd, and next 5th) The Voltage supply THD would be effected by harmonic current due to input impedance drop My first reaction is to measure the harmonics in current drawn by VSD by a PQ meter; it is likely to be rich in 150Hz and 250Hz
harmonics - What is the correct relationship between active, reactive . . . Firstly by integrating the voltage and current over a multiple of their period and dividing it by the elapsed time (simple average of the product in this case actually) Secondly by multiplying the RMS voltage by the RMS value of the fundamental harmonic of the current, knowing I do not have to multiply that by cos(phi) since these are in-phase
Sources of Harmonics (Odd and Even) On the other hand, if you take two sinewaves with one at an exact multiple of the other (a harmonic) and combine them, you'll get a waveform at the frequency of the first, but not a sinewave Add enough of these harmonics at the right amplitudes (and phases) and you can convert a sinewave into a triangle wave, a sawtooth, or a square wave or