Power meters, to measure what?

WBahn

Joined Mar 31, 2012
24,980
What do u need to know?
Well, let's just take this last round:

The output of a dc to ac invertor has harmonics going to a non linear load.
What is the point of this statement? Is it an assertion? Is it a question? Is it a given condition for a problem? What?

The 7th harmonic is the most important one why?
Is this claiming that there is always something special about the 7th harmonic? Or only DC to AC inverters? Or only for the particular inverter in this problem? What?

Important in what way? Are you asking what is so special about the 7th harmonic? In terms of particularly bad things that it causes? In terms of information it tells you? What?

The ac waveform on the output of the invertor looks fussy or has fine hairs on the ac sine waveform these are the harmonics.
Again, is this a statement? Is this a question? Is this a claim that the AC waveform on the output of any inverter looks this way? Is it a statement that these hairs are the harmonics? What?

Non linear loads have harmonics?
While I have no idea what your point is with this question, I can at least answer it with a firm, "Yes."
 

Thread Starter

Billy Mayo

Joined Mar 24, 2013
70
The output of a dc to ac invertor has harmonics going to a non linear load? It's a question , is it true or not

Are you asking what is so special about the 7th harmonic? In terms of particularly bad things that it causes? In terms of information it tells you? What?

Yes do you know anything about the 7th harmonic and why it's so special or any other harmonics?

You have to build special filters to filter out harmonics, what are these filters called?

The Hairs are the harmonics , they are from a PWM waveforms, the hairs are harmonics
 

Thread Starter

Billy Mayo

Joined Mar 24, 2013
70
The 3rd , 7th, 13th harmonics is the most important because when you use filters to level out the 3rd, 7th, 13th harmonics is turns a square waveform into a sine waveform

A power factor of 0.7 is what phase shift degree?
A power factor of 1 is what phase shift degree?

A power factor is a phase shift/degree

Harmonics are caused by the power supply filter caps voltage to current phase shift ,and switching, switching frequency?

Linear load has Zero power factor

A Capacitance load has a power factor of 0.7 or 1 or other?

A Inductive load has a power factor of 0.7, 1 or other?

A Capacitance load has which harmonics?
A Inductive load has which harmonics?

Non Linear loads has harmonics , why?

A Non Linear load sets the power factor?
 

shortbus

Joined Sep 30, 2009
7,245
The output of a dc to ac invertor has harmonics going to a non linear load. The 7th harmonic is the most important one why? The ac waveform on the output of the invertor looks fussy or has fine hairs on the ac sine waveform these are the harmonics. Non linear loads have harmonics?
Since most DC-AC inverters use mosfets to approximate AC, the output on a scope is always going to "look" like harmonics. Even though they may not be truly harmonics, but varying with pulses of voltage. Are you sure that this isn't what your seeing?
 
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