Electronics > Beginners

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

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Ice-Tea:
Haven't heard of any place that charges residential customers for reactive power, but as some others have pointed out the advent of 'smart' meters may lead to that.

soldar:
Let us not confuse the speed with the bacon.

Reactive power is one thing. Power factor is a different thing. They are loosely related.

A capacitor or an inductance across the line consume reactive power. This means they take power, store it and return it to the network. This means a power factor of less than unity.

A rectifier bridge followed by a capacitor does not consume any reactive power. At all. None. It keeps everything it gets and returns nothing. And yet has a bad power factor.

Ice-Tea:

--- Quote from: soldar on August 23, 2019, 04:50:57 pm ---Reactive power is one thing. Power factor is a different thing. They are loosely related.

--- End quote ---

Loosely?  :o

stefon:
> A capacitor or an inductance across the line consume reactive power. This means they take power, store it and return it to the network. This means a power factor of less than unity.

I don't get it, it is AC, so current flows thru cap, so it is wasting power, because it is shorting L to N.

> A rectifier bridge followed by a capacitor does not consume any reactive power. At all. None. It keeps everything it gets and returns nothing. And yet has a bad power factor.

i don't care about caps after bridge.

soldar:

--- Quote from: Ice-Tea on August 23, 2019, 06:30:10 pm --- Loosely?  :o
--- End quote ---

In the sense that there is not a biunivocal relation. Reactive power lowers power factor. So do non linear loads. The problem is not reactive loads. The problem is low power factor, whatever the cause.

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