Dry-type transformers are devices that convert electrical energy from one voltage level to another voltage level. They offer several advantages over oil-filled transformers. Firstly, there is no oil or liquid insulation material inside; instead, materials such as resin or air are used. With these features, they are environmentally friendly and minimise environmental impacts. They are also safer as they do not contain oil, which poses a risk of explosion. They have lower maintenance requirements and reduce operating costs. The risk of fire is lower and they have a lighter, more compact structure, which provides ease of installation and transport. As a result, dry-type transformers are characterised by their advantages such as safety, environmental friendliness, ease of maintenance and smaller dimensions and are preferred indoors or in sensitive environments.