This lesson covers the concept of efficiency in transformers, focusing on power efficiency and energy efficiency. It explains how efficiency varies with the degree of loading and power factor. The lesson also discusses the concept of maximum efficiency and how it occurs at a specific load and power factor. It further elaborates on the impact of varying the power factor on the efficiency versus load curve. The lesson introduces the concept of all-day efficiency, which considers the energy output over 24 hours and the energy losses due to copper and core losses. It emphasizes that the all-day efficiency is a more practical measure for distribution transformers, given the varying load patterns.

The efficiency of a transformer varies with the degree of loading and power factor.

Maximum efficiency occurs at a specific load and power factor.

Varying the power factor impacts the efficiency versus load curve.

All-day efficiency is a more practical measure for distribution transformers as it considers the energy output over 24 hours and the energy losses due to copper and core losses.

The all-day efficiency calculation requires information about the load pattern, degree of loading, and power factor over different time intervals.

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