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Factorul de putere si alte experimente


Dr.L

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Dupa cum ziceam,revin cu ceva masuratoriDin pacate UPS-ul folosit indica destul de informativ + ca momentan nu-i merg ventilatoarele,deci nu-l pot testa la putere maximaSa explic ce lumini am folosit:1) Un neon de 36W cu balast magnetic (Philips),fara condensator2) Un neon de 58W + un neon de 18W (pe aceelasi circuit), ambele cu balast electronic chinezesc3) 2x neoane de 42W (compacte) + balast electronic cu PFC activ Osram (cos-fi declarat = 0,98)4) Bec cu incandescenta de 100W Philips[attachment=0]cos fi.xls[/attachment]Precizez ca la masuratori de mai demult,becul avea un factor de putere mult mai bun. O sa revin dupa ce pun ups-ul pe picioareTeoretic,pe un indicator de cos-fi cu ac,sursele in comutatie ar putea indica 1. Dar pe un aparat de masura electronic,tot timpul se va vedea ca puterea aparenta e semnificativ mai mare.A se citi aici cum se compenseaza sursele in comutatie:http://en.wikipedia.org/wiki/Power_fact ... near_loads

This is a simple way of correcting the nonlinearity of a load by using capacitor banks. It is not as effective as active PFC

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  • Dr.L

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  • ianny

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la sursele in comutatie apar armonicile de tensiune de ordin superior ( cel mai frecvent se intalneste armonica de ordinul 7) din cauza neliniaritatii dintre curent si tensiune.

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