# Why Low Voltage Winding Is Placed On Core Instead Of HV Winding

Hello guys, welcome back to my blog. In this article, I will discuss Why Low Voltage Winding Is Placed On Core Instead Of HV Winding. Each and everything I will try to explain in a simple way.

If you need an article on some other topics then comment us below in the comment section. You can also catch me @ Instagram – Chetan Shidling.

Also, read – What Is Verilog.

Why Low Voltage Winding Is Placed On Core Instead Of HV Winding

We all know that the transformer is a static device that transfers energy from one part to another part without changing power and frequency. Now, let’s see in the transformer why the low voltage winding is placed on the limb, why not high voltage winding.

There are two reasons because of those reasons the low voltage winding is placed on the limb, such as:

01. To reduce insulation cost

02. To reduce the size of the transformer

Both the coil of cylindrical type are placed on both the limbs(the vertical portion of the core is called limb), the low voltage coil is placed near to the core whereas the high voltage coil is placed above the low voltage coil because to reduce insulation cost and size of the transformer. Now I will explain how it will reduce cost.

Let’s consider two cases:

Case 01: Low voltage winding is placed on the limb

Case 02: High voltage winding is placed on the limb

Case 01:  Low voltage winding is placed on the limb and of a transformer of 110KV/33KV.

We will analyze how much insulation is required.

Total insulation required to withstand voltage is = Insulation required to withstand voltage near core + Insulation required to isolate high and low voltage winding.

= 33 KV + (100 – 33)KV

= 33 KV + 77 KV

= 110 KV

Therefore, if the low voltage winding is placed on a limb first, then the insulation required is to withstand 110 kV voltage.

Case 02: High voltage winding near to limb and the transformer is of 110 kV/ 33 kV.

Total insulation required to withstand voltage is = Insulation required to withstand voltage near core + Insulation required to isolate high and low voltage winding.

= 110 KV + (110 – 33) KV

= 110 KV + 77 KV

= 187 KV

Therefore, if high voltage winding is placed on a limb, then the insulation required is to withstand 187 kV voltage.

If the insulation required is more then the size of the transformer also increases. If the insulation required is less then the size of the transformer also reduce, this is true in case 01. If we use more insulation then the cost will also increase.

Well, guys, that’s why the low voltage winding is placed on the limb and the high voltage winding is placed above the low voltage winding.