in case of transformer, when load is connected to the
secondary winding so flow load current. this altenating
current generate an alternating field around conductor
(winding. when this alternating field cut the conductor or
winding, an e.m.f induced in that winding.this is called
back e.m.f and current is called eddy current(Lenz's Law).
this eddy current is a cause of losses in transromer
winding. so the losses in transformer winding due to eddy
current are called stray losses. these losses also called
eddy losses. these losses are dependent on the frequency of
altenating supply because skin effect is involve in this
case. thes losses are directly propotional to the frequency.
during inrush current (harmonics) thes losses increase
because frequency increase.
Electricty is generated at around 16kV, then step up to
220kV for transmission then steped down to power
transformers then DTs and then through the LT n/w it reaches
the consumer end.
At the consumer end 230V supply is required. So, why is
electricity not generated directly at 230V and transmitted?