OLTC on HV or LV side of transformer 2

[cesgibis]

What are the advantages of having OLTC on the HV or LV winding of a transformer ? Why are they always installed on the HV side ?
HV side: current is lower but voltage is higher

Thanks.

 

[slavag]

Hi.
You have answer in your Q.
Current is lower. It's "easy" for OLTC contacts--> small size of OLTC---> cheaper.

Best Regards.
Slava

 

[bacon4life]

Not quite always installed on the high side, the United States still has quite a number being purchased with low side taps changers. Biggest reason we get them is that we have always got them and change is hard no matter how much better the product. It also more carefulness to when saying "raise" on a high side tap changer whether you want to raise the tap position or to raise the secondary voltage.

 

[edison123]

Other than current factor,

1. The more no. of turns on the HV side gives a better resoultion i.e. finer steps of voltage change.

2. With LV windings normally placed next to the core and behind HV windings, it is more difficult to bring the taps out. (You could always place the tapped LV windings outside the HV windings but that would make the transformer bigger and costlier).

 

[thecont2000]

thanks alot