Why Auto Transformer Is Not Used As A Distribution Transformer
Auto transformer and distribution transformer are two types of transformers that are used for voltage regulation. However, they differ in many ways, and one significant difference is their usage.
Auto transformers have a single winding that serves both as the primary and secondary winding. On the other hand, distribution transformers have two separate windings for primary and secondary. Because of this difference, auto transformers are smaller in size and weight than distribution transformers, consuming less material and resources. They are also less expensive to manufacture, making them more cost-effective.
However, despite the cost and size advantages, auto transformers are rarely used as distribution transformers due to safety concerns. The primary reason is that they lack electrical isolation between the primary and secondary windings. Since they share a winding, any fault or disturbance in one winding can transfer to the other. This can cause several safety issues, including electric shock, fire hazard, and equipment damage.
Additionally, auto transformers pose a risk of harmonic distortion, which can negatively affect electrical equipment. Voltage regulation in auto transformers is achieved by varying the turns ratio between the primary and secondary windings. This can cause voltage distortion when varying loads are connected, leading to fluctuations and an unsteady supply of electricity.
Lastly, distribution transformers are designed to handle higher voltages and have better insulation than auto transformers. This makes them more reliable and safer to use in distribution networks.
In conclusion, while auto transformers have several advantages over distribution transformers, their lack of electrical isolation and potential safety hazards make them unsuitable for use as distribution transformers. Distribution transformers are designed to meet specific safety and electrical requirements that make them an ideal choice for distributing power over long distances.
