Quick Answer
Transformer efficiency measures how much input power is converted to output power. Modern distribution transformers achieve 97-99.5% efficiency. DOE 2016 standard mandates minimum efficiency levels. Higher efficiency reduces energy costs significantly over the transformer lifespan.
Understanding Transformer Efficiency Ratings
Transformer efficiency directly impacts operating costs and environmental footprint. This guide explains efficiency ratings, regulatory standards, and how to calculate the true cost of transformer losses.
What is Transformer Efficiency?
Efficiency (%) = (Output Power / Input Power) × 100
No transformer is 100% efficient. Energy is lost as heat through core losses (no-load) and copper losses (load-dependent). Typical efficiency ranges from 97% to 99.5% depending on transformer type, size, and design.