Question { NTPC, 23512 }

what are the types of sus station ?

Answer

generally four types of substation.thes are
Step-up Transmission Substation
Step-down Transmission Substation
Distribution Substation
Underground Distribution Substatione are

Question { NTPC, 22521 }

Why a Transformer Noise during its running condition ??

Answer

Transformer noise is caused by a phenomenon called
magnetostriction. In very simple terms this means that if a
piece of magnetic sheet steel is magnetized it will extend
itself. When the magnetization is taken away. I goes back
to its original condition. A transformer is magnetically
excited by an alternating voltage and current so that it
becomes extended and contracted twice during a full cycle
of magnetization.

Question { Australia Visa, 88994 }

Why Power generation in India is at 50Hz while in America
its 60Hz so is there any advantage/Disadvantage of this ??

Answer

it used accordingly to the standerd of the power generation.