Question { Vedanta, 12843 }

where do we connect tap of tap changer, to H.V. side or
L.V.side? and why?

Answer

Normaly its connected in the primary side of the
transformer its not a matter of HV or LV why we use the tap
changer? in case of variation in the input output also
varied ( increase or decrease)we need to maintain the
constant voltage at the output by varing the tape we can
get the constant voltage at the output the AVR also used
for the same function

Question { 3790 }

wht is meant by sh6

Answer

thats not SH6 That is Sf6 ,this is a gas sulfur hexa
floride this is used as a insulating medium for higher
rating breakers this is used as a insulating medium,arc
quenching purpose