Answer / parmod kumar

it has the same two power sources, and a transfer switch
that selects between them. It is the exact opposite from
the standby UPS because it has reversed its sources: in the
online UPS the primary power source is the UPS's battery,
and utility power is the secondary power source!
Under normal operation the online UPS is always running off
the battery, using its inverter, while the line power runs
the battery charger.

how much current will take for 1kw power. and what is the eqoutiion which is connecting with kw and A.

2 Answers  

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ful form of gis

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why there is a phase shift lies between primary and secondary voltages of a transformer?

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What is the physical significant of power factor?

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1> what r different types of fault in cables? How will u locate and test these faults? 2> why earth wire is provided on top throughout the transmission line. why not only on towers? How much area it can protect? 3> what r different types of transmission losses? How power loss can be minimized? 4> what is the % of power loss on transmission lines?

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what is difference between AC VVVF drive & Dc VVVF drive explain their working principle?

13 Answers   Apollo, OPS,

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How to calulate the NGR resistance ?

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What is power factor? How to improve Power factor? draw a circuit diagram showing the connection of power factor improvement equipment to the electrical instillation.

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How to calculate cable sizing

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what is isolation Transformer?

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what is the formula of starting current of 3phase and 1 phase motor???

0 Answers  

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