if we want to convert the two 12 V DC batteries in parallel for UPS ? what would be the result ? which is better for a UPS , connect two batteries in series or connect them in parallel ?

2 Answers  

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Dear Friends, I have a 500KVA transformer supplying whole factory having 3 phase and single phase mixed loads. Power room has ammeters connected via CTs for individual phase. Now I know that readings shown on meter for each phase say R,Y and B are line currents. But when I want to know the total on transformer do I need to add the currents of all three phases readings shown on meter or value for anyone phase will give me the correct power load on transformer for that point of time. 2. If ammeter shows unbalanced readings for R,Y, B phases say 150, 250 and 300 respectively so can I assume that 150A i.e average of 3 will be the 3phase load currents and remaining will be 1phase currents. Please clarify my doubt.

4 Answers  

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What are the different protection systems used to protect the transformer internally and externally?

16 Answers  

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3-PHASE 15KVA dg IS EQUIVALENT TO 12 KW,hOW?

2 Answers   TATA,

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Why the transmission lines are in 11kV, 22kV, 33kv, and why not 10kV,20kV, 30kV?

2 Answers   Bhel,

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whats the diff b/w mpcb and mcb?weather it trips on single phasing or not.

9 Answers   Electra Power, Essar,

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what is the formula of high voltage testing of three phase induction motor?

1 Answers  

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what are the maximum available current, voltage ratings and switching speeds of the power electronic devices thyristor, power mosfet, igbt, and mct?

0 Answers  

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what is phase angle and how its generate moreever how we measure the phasse angle?

1 Answers  

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WHAT IS MEAN BY MAGNETIC LOCKING

3 Answers   Bhel,

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( Re: WHAT SHOULD BE THE RATING OF MCCB FOR 415V,3Ph,50KVAR CAPACITOR BANK Answer # 1 The capacitor current would be kvar x 1000 / (415 x sqrt3). This would be 70a approx. The MCCB selected should have *atleast 1.4 times this current i.e. 1.4 x 70= 98. So you should choose at least 100 A mccb.) regarding to this answer,i would like to know why the current have to times 1.4 to get the right amphere for the mccb.hows the formula to get the 1.4??tq

2 Answers  

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difference between synchronous reluctance motor and switched reluctance motor

1 Answers  

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