Answer / n nagaraju

good question ...
in an power trnsformer is primary winding is star &
secandry is delta correcte
in case fail earting transformer get damage .
becase of heat generating of winding

open circuit test when performed on double the voltage & double the freq, then what will happen with p.f and current magnitude?

1 Answers   Aarti Drugs,

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What is the Surge for 1.1 Phase Induction Motor(For Eg.1Hp) 2.3 Phase Induction Motor(For Eg.1Hp) 3.AirConditioner(For Eg 1Ton) 4.Refrigerator(For Eg 180Ltr or 160kW) 5.Induction Cooker 4. Ceiling Fan

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What is the formula to calculate the rating of a three phase trnasformer

1 Answers  

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How power cable & control cable can be differentiate from each other ?explain?

14 Answers   Aster, Finolex, TCE,

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why neutral and earth should not be connected on 3 phase 440v/50c/s supply at consumer side. where as on 25kv/ac/50c/s railway traction substation neutral and earth will be connected and track at substation. and track will act as neutral and earth. Reasons for this is needed urgently

4 Answers  

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meter ratio is 100/5 CT ratio is 125/5, when the ratios changes i.e., CT ratio is 125/5 meter ratio is 100/5 what is the MF in boths conditions?

1 Answers  

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Why r used of cable 50sq.mm and above size cable in 3.5 core. And below size in 4 core ? any technical reason please explain it

2 Answers  

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how to varied the frequency in transmission line and how i kept it as a constant one?

2 Answers   L&T,

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how to define vector group of transformer

1 Answers   Engro, Reliance, TATA,

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why the rating of transformer in only KVA not in others?

7 Answers  

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Why earthing done?

1 Answers   CBRE,

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Why squirrel cage motor can only use with low starting loads ?

0 Answers   BEC,

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