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  1. #1
    Registered User momchilmg's Avatar
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    Âúïðîñ çà ìîùíîñò íà UPS

    Çàùî íà òåçè óñòðîéñòâà íå èì ïèøàò êîëêî å ìàêñèìàëíàòà ìîùíîñò âúâ W/h, à ïèøàò ñàìî VA?

    Ïî ïðèíöèï çíàì, ÷å V.A=W è ñëåäîâàòåëíî VA = W, íî òîãàâà çàùî ãè ïèøàò òàêà, à íå íàïðàâî W?

    Êúäå å óëîâêàòà è êîëêî W/h å òîâàðúò íà UPS ñ îáîçíà÷åíèå 600VA? Ïðåäïîëàãàì å äî 600W/h, íî íå ñúì ñèãóðåí.
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  2. #2
    Registered User taralion's Avatar
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    "VA" è "W" ñà ðàçëè÷íè äèìåíñèè. Ðîçðîâè ÷è÷êî Ãóãàë èëè íÿêîÿ êíèæêà ïî åëåêòðîòåõíèêà è ùå òè ñå èçÿñíàò òåðìèíèòå.
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  3. #3
    Registered User momchilmg's Avatar
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    ×è÷êî Ãóãúë íå ìè êàçà, êîëêî W òîâàð ìîæå äà ïîíåñå òîçè UPS. Âñúùíîñò òè ñúùî.
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  4. #4
    Registered User taralion's Avatar
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    600 VA - 325 W.
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  5. #5
    Registered User momchilmg's Avatar
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    Ìåðñè!
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  6. #6
    Registered User taralion's Avatar
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    Ìîùíîñòòà ñå êëàñèôèöèðà êàòî: Ïúëíà ìîùíîñò S – èçìåðâà ñå âúâ VA, àêòèâíà ìîùíîñò – èçìåðâà ñå âúâ âàòîâå W, ðåàêòèâíà ìîùíîñò Q – èçìåðâà ñå âúâ VAR.

    S= P + Q

    P= S * cos Ø

    Íàé-øèðîêî èçïîëçâàíàòà â ñâåòà ìÿðêà çà ìîùíîñò íà UPS å âúâ VA èëè KVA (ñúùèíñêà ìîùíîñò S).

    Ìîùíîñòòà íà UPS ñå èçìåðâà âúâ âîëò-àìïåðè (VA, ïúëíà ìîùíîñò). Ìîùíîñòòà íà êîíñóìàòîðèòå ñå èçìåðâà âúâ âàòîâå (W, àêòèâíà ìîùíîñò). Åëåêòðè÷åñêèòå òîâàðè ïîòðåáÿâàò êàêòî àêòèâíà, òàêà è ðåàêòèâíà åíåðãèÿ. Çà èç÷èñëÿâàíå íà íåîáõîäèìàòà ïúëíà ìîùíîñò íà UPS ñèñòåìà, çàõðàíâàùà êîìïþòúðíè ñèñòåìè ñå èçïîëçâà êîåôèöèåíò íà ìîùíîñòòà. Ïðåäñòàâëÿâà îòíîøåíèå íà àêòèâíàòà ìîùíîñò (W) êúì ðåàêòèâíàòà ìîùíîñò (VA), ïîòðåáÿâàíà îò òîâàðà. Çà êîìïþòúðíè ñèñòåìè ñ èìïóëñåí çàõðàíâàù áëîê òîçè êîåôèöèåíò å íàä 0.7 .

    Êàê äà ñå îïðåäåëè íåîáõîäèìàòà ìîùíîñò íà UPS? Íàïðèìåð, àêî ìîùíîñòòà íà UPS óñòðîéñòâîòî å 1000VA, ïðè êîåôèöèåíò 0.7 òîé ìîæå äà çàõðàíâà êîíñóìàòîðè ñ ìîùíîñò äî 700W. Ïî-ïðàâèëíî å ïðè èçáîð íà UPS äà ñå îñòàâè ðåçåðâ íà ìîùíîñòòà è çà êîåôèöèåíòà äà ñå èçáåðå ñòîéíîñò 0.6, òàêà 1000VA UPS ìîæå äà çàõðàíè êîíñóìàòîðè ñ ìîùíîñò äî 600W.
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  7. #7
    Registered User momchilmg's Avatar
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    Òî÷íî òîâà, ÷åòà â åäèí ñàéò ñåãà.
    òàì ôîðìóëàòà å:

    VA.PF=W

    Êàòî PF e:
    Finding the Power Factor
    How do you find the power factor? This isn’t easy. For computer power supplies and other supplies that are power factor corrected the power factor is usually over 90%. For high power motors under heavy load the power factor can be as low as 35%.

    Industry standard rule-of-thumb is that you plan for a power factor of 60%, which somebody came up with as a kind of average power factor.


    Êàçâàò, ÷å çà êîìïþòúðíèòå ñèñòåìè PF ìîæå äà äñòèãíå äî íàä 90%.
    Êàêòî è äà å, íà ìåí è 300W ìå óñòðîéâàò èäåàëíî.
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  8. #8
    Registered abUser ike's Avatar
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    Åäíî âðåìå èìïóñíèòå çàõðàíâàíèÿ íà êîìïþòðèòå íÿìàõà êîðåêöèÿ http://en.wikipedia.org/wiki/Power_f...n-linear_loads . Çà åëåêòðè÷åñêàòà ìðåæà ïðåäñòàâëÿâàò ïî÷òè êîíäåíçàòîð.
    Çà òîâà è íà UPS-èòå ïèøåõà "ìîùíîñòòà" âúâ VA, çàðàäè ïî-ãîëåìèòå ÷èñëà.
    Ñåãà ñúâðåìåíèòå çàõðàíâàíèÿ èìàò êîðåêöèÿ íà ôàêòîðà íà ìîùíîñòòàòà. È çà ìðåæàòà ïðåäñòàâëÿâàò ïî÷òè ðåçèñòîð. Íî òîâà íå çíà÷è, ÷å íà UPS VA=W. Àêî íà ïðúâ ïîãëåä íå íàìåðèø ÿñíî íàïèñàíà ìîùíîñòòà ïðèåìè, ÷å W=VA/2.
    Have no fear ike iz here.
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