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For what loads, active power turns negative?

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For an arc, it may mean when an incremental increase in V brings an incremental decrease in I.
 
Don't really understand your question. Where have you found the term "negative active power"? Are you referring to a "negative power factor"?
 
The only thing that makes sense is a generator.
Negative active power is when the 'load' is an electrical generator.
 
If you mean great inductive loads, you need read some about reactive power , reactive power compensation. May be it's no the better article :**broken link removed**
 
Don't really understand your question. Where have you found the term "negative active power"? Are you referring to a "negative power factor"?

If AP = V*I * PF, where V*I >=0, then AP < 0 if and only if PF < 0.
Didnt think i'd need to explain it.
 
If AP = V*I * PF, where V*I >=0, then AP < 0 if and only if PF < 0.
Didnt think i'd need to explain it.

If the power factor is negative then the average power is flowing the wrong way. As Sceadwian says, the load is a generator (or at least something capable of supplying power).

e.g. your electricity company supplying power to your house would see a negative power factor if you have a solar supply and it is supplying power to the grid.
 
Alphacat, any electric motor under the right conditions can produce energy rather than use it, so any electric motor as a load in theory can produce power rather than use it. Under any normal circumstances however motors draw power not generate it.
 
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