Electronics > Beginners

nobody talking about switching PS wasting power on input filter caps?

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GerryR:

--- Quote from: james_s on August 23, 2019, 04:16:56 pm ---In the USA residential consumers do not pay for reactive power, I can't speak for elsewhere.

Also as I mentioned earlier, if you have any inductive loads they will cancel out the the capacitive loads.

--- End quote ---



It isn't indicated on your bill as "reactive" power, but believe me, we are paying for it!

The purpose of pf correction is to put the current in phase with the voltage; pf is the cos of the angle.  That is why they have huge capacitor banks in motor-rich industrial environments.  If you have ever been inside a pf-correction cabinet, you will see that there is some loss by the amount of heat generated inside the cabinet, but not as much loss as what is being saved.




Ice-Tea:

--- Quote from: GerryR on August 26, 2019, 11:28:34 am ---
--- Quote from: james_s on August 23, 2019, 04:16:56 pm ---In the USA residential consumers do not pay for reactive power, I can't speak for elsewhere.

Also as I mentioned earlier, if you have any inductive loads they will cancel out the the capacitive loads.

--- End quote ---

It isn't indicated on your bill as "reactive" power, but believe me, we are paying for it!
--- End quote ---

I'm curious.. how exactly are you paying for it?

GerryR:
I have no way of knowing "exactly," but I'm sure the power companies have a good idea of the total reactive power being used and have that factored into the rates we pay each month.

Ice-Tea:
Oh, sure, no doubt. But you can use 0 VAR or 10kVAR at your house and not pay a dime more.

Circlotron:
I suppose we all pay from the point of view that the electricity supply companies install larger lines, transformer and switch gear than would be necessary if all loads were unity power factor. The extra cost of that larger equipment is passed on the consumer in one way or another.

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