Question { 15556 }

In an LT pole, the line voltage is 415V. How is it
converted to 230V into the house via the service cable?

Answer

From distrubation transformer we get three phases and one
netural (due to Star connection) these four wire(three
phases and one netural)are layed over head on LT poles and
for house only one phase along with netural is used and no
convertor is used as phase to netural voltage is 230volt

between R -y- b phase voltages are 415 - 415-415 called
as line value where as between phase and neutral it will
be 415/1.732 = 239 approximately 230v called as phase value

Question { 8206 }

why single induction motor is not self starter?

Answer

Single phase supply to motor can't produce continuously
rotating magnetic field as either N or S
pole would be present at a time. so there will not be force
of repulsion as well as attraction This is not sufficient
to drive the rotor from one end. So a capacitor
is employed to shift the phase & to create rotating magnetic
field.

Question { 15079 }

How much load can give on 1600 kva transformer 11kv/440

Answer

approximately 2100 amp on lv side