Understanding Parallel Operation of Transformers-2 — Lesson 5

This lesson covers the concept of parallel operation of transformers, an important topic in electrical machines. It explains the process of connecting two transformers in parallel, the conditions required for this operation, and the implications of different voltage and KVA ratings. The lesson also discusses the importance of the quality and magnitude of the leakage impedances of the transformers. Using an illustrative example, it demonstrates how the load current is shared between two transformers with different KVA ratings and how the load demand can be met by connecting more transformers in parallel.

Video Highlights

02:20 - Explanation of how the load is shared between two transformers connected in parallel.
06:08 - Discussion on the importance of the ratio of the currents in the transformers for better load sharing.
16:26 - Explanation of the conditions required for meaningful parallel operations of transformers.
22:03 - Explanation of how the KVA is supplied by the transformers in parallel operation.

Key Takeaways

• Transformers can be connected in parallel to meet increased load demand.
• The voltage ratings of the transformers must be the same for parallel operation
• The load current is shared between the transformers in the inverse ratio of their respective KVA ratings.
• The quality and magnitude of the leakage impedances of the transformers play a crucial role in load sharing.
• For optimal load sharing, the leakage impedances should be inversely proportional to the KVA ratings of the transformers, and their qualities should be the same.