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

What is thresh hold value of current?

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What is inrush current?

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why is it that the HT motors & motors having very low kW rating(<1kW) have windings connected in STAR, whereas the motors having in between kW ratings have DELTA connected windings??

5 Answers  

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when we r using 3.5 cable for a bldg. and put laod on each phase using the neutral and neutral is the return paht for the phase so the current of the neutral must be Ir+Ib+iY (return).But the size of the netural is .5 as comper to the phase.

2 Answers  

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Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply..............

9 Answers   NTPC,

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Explain how you decide what size of electrical wire do you need?

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what is the working principle of induction motor

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how dia of wire and angles are calculated for overhead shielding wire to protect substation equipment from lightening strokes???

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Leakage current,un balance current which relay using for high voltage transmission?

0 Answers   Banking,

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defination of loads

1 Answers  

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what is the principle of operation of domestic fan?? what is the role of capacitor in it??

5 Answers  

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why single core HT cable need only one side earthing?

2 Answers  

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