Consumption lamps with ampoules G23 G24 * GX24 * and 2G *!

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Christophe
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by Christophe » 25/10/07, 15:10

Thank you for not saturating all the topics talking about electrical tests...
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gregdu13250
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by gregdu13250 » 18/02/08, 23:12

Strange I did the test with a wattmeter (current clamp in position W so 2 wires connected to the phase and the neutral, I have 1W more on a philips 17w
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by Christophe » 19/02/08, 09:00

1W more on 17W?
It doesn't seem too strange to me, does it?

Otherwise a current clamp poses the same cos phi problems because it is unable to take it into account...
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gregdu13250
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by gregdu13250 » 19/02/08, 18:05

My cos phi is really close to 1 (> 0.9)
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daubster
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by daubster » 27/12/09, 16:07

delnoram wrote:Last tests to date:
1 fluorescent tube (often wrongly called neon) 36W 1.2meter
Original mounted with a 0.047 µf capacitor
Conso 44W (0.4A x 228V x cos (phi) 0.48)

Mounted with 1 capacitor (start) of 4.7µf
consumption 34W (0.19A x 228V x cos(phi)0.78)

i.e. 10W of gain and a reduction of half of the current debited by the wires.



Bonjour à tous

(to delnoram) I'm a rookie & I struggle to understand the logic of your calculations....
I naively believed in the supremacy of UxI=P and here comes this "cos phi"

Why do we care about cos phi? Doesn't the individual's EDF meter count the kW based on the amperage alone ("active" power if that's its name)?

My calculations (according to multimeter measurements) are basic
36W tube with original 0,047uf condo:
0,44A x 230v = 101W

36W tube with 2 parallel 25uf condos (total 50uf):
0,2A x 230 = 46W

Isn't that fair?
Please, what did I not understand?
And why multiply by cos phi?

Also, I read somewhere that the closer the cos phi is to 1 the better.
In your calculations the closer it is to 0 & the lower the power
Please explain to me....

Thank you so much.............
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