Answer / kj

On a new alternator the markings are usually U V W N
These match to R Y B N.
But it may be that the phase rotation in the building is
backwards and all the 3 phase motors will then run
backwards on the new alternator supply.
A phase rotation meter should be used to confirm that the
phase rotation is identical.

Answer / b.janardhana rao

Normally we erection the new generator we connect the main supply from DG set to Electrical pane. we charge the panel from DG supply then we check the direction of motors. if it is reversed the we change the polarity of 3 phases. RYB to change RBY.

i have install 750 kva distribution transformer at my site and want to do neutral earthing. what calculations should i follow to determine earthing conductor material and size?

0 Answers   MTDC,

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What is the purpose of RECTIFIER ASSEMBLY in AC power generators?

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Compare OH Transmission & UG Transmission?

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sir i have applied for isro-09. still i did not got the HALL TICKET.

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what are the 6 terminals of the motor plss give me in details

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1.stranded resistance values of motors? 2.how to calculate the resistance values of single phase and 3phase motors?

2 Answers   Bell, L&T,

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1. If we apply dc supply to the primary winding of transformer it will be burnt out. similarly dc supply is given to field winding of syn. motor and armature winding of dc motor, they are safe. (Remember both windings inductive nature) what is the reason behind that?

2 Answers  

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What are the different sizes of cables for H.T and L.T side of supply?

7 Answers   Bhel, BSES, Karthik Industries, Lanco, Nedco, Shilpa Electrical Engineers, TATA, Torrent Power,

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why the transformer is not operates on two phase?

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Which ciass CT can be use in diff. protection. Can be use 5p20?

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single phase power supply give to separate one steel coup with water, what reaction create

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If excitation will increase, then what will be the effect on power factor? Will it decrease or increase?

4 Answers   Prozone,

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