Consumption of an electric transformer

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Castor
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by Castor » 14/10/06, 11:03

when you say bulb, do you mean LED lamp or incandescent bulb?

Normally "linear" devices should not pose a problem (incandescent lamp, heaters, radiator, motors ...).
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by delnoram » 14/10/06, 11:12

Castor wrote:when you say bulb, do you mean LED lamp or incandescent bulb?

Normally "linear" devices should not pose a problem (incandescent lamp, heaters, radiator, motors ...).


Ooops !!! : Oops: I forgot "fluo". (correction made on the previous text :? )
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by Castor » 14/10/06, 11:18

Re-

You would have the figures of your measurements?
And at the same time, for what power are the lamps sold?
What do you use as an amperemeter?
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by delnoram » 14/10/06, 11:32

Castor wrote:You would have the figures of your measurements?


No, I no longer have these figures from August (the cleaning went through) I would do it again it will allow to perpetuate them
:|
Castor wrote:What do you use as an amperemeter?


ITC777 and VC200 green multimeter ammeter of APPA95 being HS : Cry:
That of the stuffs General public (chui zamateur la in : Cheesy: )

bulbs given for 13W measured at about 10W (voltage variation requires).
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by delnoram » 16/10/06, 19:02

Good with the bulbs we are a bit off topic, after having made the measurements on 2 fluorescent bulbs data for 13W:
0.05A 220V Cos1.0 11W each.
0.10A 220V Cos 0.86 18.92W Sets
So the difference comes from the Cos (phi) that goes from 1 to 0.86

The measurements were delicate because of amperage that during the heating of the lamps varies between 0.04A and 0.05A and also the voltage 219V to 222V, but especially the big problem that I saw on these bulbs only, it is a cos (phi) totally erratic.
One day at 1.0 without moving, another day, a second at 1.0 then at 0.83 then 0.84 and even a small passage at 0.03.
So when all is involved it is impossible to achieve a measure in correct Watt.

Now to know if the given Cos is good or if it is the electronics of the lamp which disturbs the PM230 ..........?
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by Castor » 16/10/06, 21:58

Bonsoir.

Indeed, it is possible that the wattmeter is in the wind.
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by Other » 17/10/06, 03:56

Hello
I think you did not choose what is easier to measure
(fluorescents).

You have to be careful when you take the wattage figure that is written on a lamp, it is related to many factors,
Curious thing some equipment that are mainly made for the American market so 60 hz are sold in Europe under 50 hz and the values ​​in power remains the same, can be true for pure resistances, but as soon as there transfo or other?

Reston on a very simple example, a given incandescent lamp for 100watts but has a very specific voltage.
Powering the lamp with 12 volts, 100 volts and 220 volts and doing the math gives you funny numbers, which are influenced by the temperature of the filament.
the other test with a scale that sends pulses of current
it is surprising to see the consomation of current for such a low light when we reduce to 25% brightness ...

Andre
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Castor
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by Castor » 17/10/06, 12:10

Bonjour.


Effectively the efficiency of an incandescent bulb should decrease sharply when used at reduced power.

By cons, the use of a dimmer completely deforms the voltage, it will not be at all sinusoidal, there will be full of harmonics of voltage and current. To make such a measurement, a wattmeter with a low bandwidth, such as the PM230 will give completely erroneous indications.
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by delnoram » 17/10/06, 18:32

Andre wrote:Hello
I think you did not choose what is easier to measure
(fluorescents).


Yes, when it's too easy, it's not funny : Cheesy:
More seriously, this type of measures to the advantage of pushing the Wattmeter in its entrenchments and therefore to find in it condition and until or we can give him our confidence on the measures.
Can we now learn a lesson?
For example, is the Cos (phi) given by the power meter on electronic equipment measurements valid each time?
And if I understood correctly the answer is "not always"
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by delnoram » 20/10/06, 19:53

Andre wrote:You have to be careful when you take the wattage figure that is written on a lamp, it is related to many factors,
Curious thing some equipment that are mainly made for the American market so 60 hz are sold in Europe under 50 hz and the values ​​in power remains the same, can be true for pure resistances, but as soon as there transfo or other?

A small photo to illustrate

Image
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