Question { 4384 }

tell how current tranfomer works

Answer

Current transformer is a device which helps to measure the
circuit current in which high current flows.Generally we
cannot measure kiloamps by using simple low cost ammeter, so
CTS helps to measure by connecting its primary in series
with the circuit and the low scale ammeter with its secondary.

example : 4000/5 Cts , here easily we can measure the
quantity of current flows in high current circuit by
measuring at its secondary and by multiplying the ratio
factors. Note : secondary of the secondary should not be
kept open while using in live circuit.

Question { Cummins, 29093 }

what is the function of Choke?

Answer

choke is a high inductive device and does not allowed sudden
change of current , if it happens then a high voltage
induced as per the equation- V= L di/dt. Starter helps to
break the circuit as initially current flows , from supply
to choke,tube light one coil, starter, tube light other coil
then back to supply. when starter opens the circuit the
induced voltage across the tube light is sufficient to
ionise the fluorescent material inside the tube light and
the current path made through it. and tube light glows.

Question { 3849 }

Which starter can be used for 3 phase verriable speed (2
stator wdg) induction motor ?

Answer

auto transformer starter