Understanding Parallel Operations of Transformers-3 — Lesson 6

This lesson covers the intricate details of parallel operations of transformers. It delves into the conditions necessary for successful and effective parallel operation, such as the need for the same voltage ratios, leakage impedances being inversely proportional to their KVA ratings, and the transformers belonging to the same vector group. The lesson also explains the concept of per unit impedance and its importance in transformer operations. For instance, if two transformers are operating in parallel, their per unit impedance should be the same for better load sharing.

Video Highlights

01:50 - Discussion on the implications of the ratio of the currents
08:21 -Discussion on the operation of transformers at different power factors
18:34 - Discussion on the conditions for successful and effective parallel operation of transformers
23:18 - Explanation of the importance of transformers belonging to the same vector group
26:45 -Discussion on the need for transformers to operate in parallel

Key Takeaways

• For successful parallel operation of transformers, the voltage ratios, leakage impedances, and the transformers' vector group should be the same.
• The leakage impedances of the transformers should be inversely proportional to their KVA ratings.
• The per unit impedance of the transformers should be the same for better load sharing when operating in parallel.
• The transformers should belong to the same vector group for successful parallel operation.