Answer / ma.amulraaj,b.e. mba.,

The previous answer is wrong.Because irrespective of equipment,we have to manufacture any equipment economically.

If we provide the HV winding Near to the core,Suppose the HV voltage is 11000V.We have to provide the insulation between core and HV coil is 11000 V.Then in between HV and LV winding agin we have to provide insulation 11000 V.Here The insulation cost is very high.

In other way ,if we provide LV winding near by core,the LV voltage is 415V,we have to provide insulation for 415 V between core and LV winding only.So cost of insulation is considerabily reduced.


That is why HV winding is not placed near to core.

Answer / raghavendran.r

One of the reason for that is the practical difficulty in
the arrangement of the Tap Changer, because Tap changer is
placed on HT side for voltage adjustment.

Also the insulation between the Core and the HT winding
has to be thick to withstand the stress.So the size of the
arrangement will be more bulkier.

Answer / kharwar pritam

if you provide hv winding nearer to the core of the transformer....then the insulation betn core and hv will be THICKER....and hence the cost of insulation will increase..and also the size of the transformer ...after then you have to provide insulation betn hv and lv(it is compulsory to provide insulation betn lv and hv....whatever hv is nearer to the core or lv...but with lv there will be thin insulation betn core and lv...and about tapping.. you can provide taps on any winding..according to your need..).....this all just because of insulation consideration ..!!!!

Answer / pranay bhaurao thengne

If we placed lv winding placed first to the limb and then hv former and hv winding ...
Due to this arrangement minimises the leakage reactance and leakage flux .
And improves mutual inductance between two windings ...
And also for cooling purposes...
 And requires less amount of insulation...

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