Understanding Autotransformers and Copper Savings — Lesson 3

This lesson covers the concept of autotransformers, their operation, and the potential savings in copper usage. It explains how autotransformers can change voltage levels, similar to two-winding transformers, and discusses the choice between using an autotransformer or a two-winding transformer. The lesson also delves into the calculation of copper savings in autotransformers, demonstrating that less copper is required in autotransformers compared to two-winding transformers. However, it also highlights the lack of isolation in autotransformers, which can lead to potential issues in case of an open circuit fault.

Video Highlights

01:13 - Comparison between a two-winding transformer and an autotransformer
11:12 - Calculation of the ratio of copper required in an autotransformer to a two-winding transformer
16:28 - Explanation of how the amount of copper required depends on the turns ratio
30:37 - Explanation of the potential issues with an open circuit fault in the common portion of an autotransformer
33:11 - Discussion on the lack of isolation in an autotransformer compared to a two-winding transformer

Key Takeaways

• Autotransformers can change voltage levels similar to two-winding transformers.
• Less copper is required in autotransformers compared to two-winding transformers, leading to potential cost savings.
• Despite the copper savings, autotransformers do not provide isolation between the source and load side, which can lead to issues in case of an open circuit fault.
• The choice between using an autotransformer or a two-winding transformer depends on the specific requirements and constraints of the application.