Answer / k.prakashchandra

When the ups voltage = battery voltage,Number of batteries
required = desired back up hours x load /V x AH of each battery

To determine the Healthiness of Insulation we will be performing Dielectric tests i.e Insulation Resistance test, Partial Discharge test,Switching Impulse, Lightning impulse, Tan Delta test ...etc why we required to perform this many test, why cant we do only one test. for Transformer, CT's

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How does "OUT OF STEP" relay ,for Synchronous motor protection, work?

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why the earth pin is thicker than other pins in a plug? If it is for reducing resistance, then why the copper earth wire is not so thick as earth pin of socket?

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Why transformer, generator, ups rating kva?

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what is the acceptable limit value for Desolve Gas Analysis/

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how to calculate the bus-bar size. give formula with description

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can we make a loop between neutral and body for grounding?

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