Given I use the regenerator for audio, I’ve always had it on Sine too.
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Just as a sidebar, 3rd order harmonics are the product of 3 phase power transmission, and is carried along with the single leg used to feed homes. For those wanting to take a deeper dive;
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There are of course acoustic 3rd order harmonics produced by strings, for example, as well as harmonics of tubes, which I suspect aren’t entirely attributable to the power.
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In my solid state system (Plinius Tautoro and 2 SA 103 monos), it is the opposite : I get more air and treble with increasing MW. My ideal level is 4, above that it becomes a bit bright and over etched.
Thanks, I will experiment more with my new unit when it arrives.
I’m hoping the P20 will reject line noise better than the P5.
I was speaking directly to the harmonics on the AC, it’s causes and how it’s used to manipulate supplies.
A positive sequence harmonic ( 4th, 7th, 10th, …) would rotate in the same direction (forward) as the fundamental frequency. Where as a negative sequence harmonic ( 2nd, 5th, 8th, …) rotates in the opposite direction (reverse) of the fundamental frequency.
Generally, positive sequence harmonics are undesirable because they are responsible for overheating of conductors, power lines and transformers due to the addition of the waveforms.
Negative sequence harmonics on the other hand circulate between the phases creating additional problems with motors as the opposite phasor rotation weakens the rotating magnetic field require by motors, and especially induction motors, causing them to produce less mechanical torque.
Another set of special harmonics called “triplens” (multiple of three) have a zero rotational sequence. Triplens are multiples of the third harmonic ( 3rd, 6th, 9th, …), etc, hence their name, and are therefore displaced by zero degrees. Zero sequence harmonics circulate between the phase and neutral or ground.
Unlike the positive and negative sequence harmonic currents that cancel each other out, third order or triplen harmonics do not cancel out. Instead add up arithmetically in the common neutral wire which is subjected to currents from all three phases.
The result is that current amplitude in the neutral wire due to these triplen harmonics could be up to 3 times the amplitude of the phase current at the fundamental frequency causing it to become less efficient and overheat.
Are AC harmonics all a whole number multiple of 60Hz (or 50Hz depending where you live)?
By definition;
Harmonics are voltages or currents that operate at a frequency that is an integer (whole - number) multiple of the fundamental frequency.
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This is untrue for musical instruments/physics, hence my question as to what harmonics are in the context of AC power.
S,o far 60Hz power, the only harmonics one will see are 120Hz, 180Hz, 240Hz, etc., yes?
It also appears with power the initial 60Hz signal is referred to as the first harmonic, not as the fundamental. Is this correct?
I’m really not sure how this topic went from AC to instruments. I’ve stated three times now we are talking about power transmission. For the sake of this conversation, we are talking about 3 phase power, and the fundamental frequency would be 60Hz in the US for example.
By definition;
The lowest possible frequency at which a string could vibrate to form a standing wave pattern is known as the fundamental frequency or the first harmonic .
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Yes, I am asking about AC power. The nomenclature is apparently different from that used in physics when describing vibrating objects. I thus want to make certain I understand the AC terminology.