Those transformers installed at the sending or receiving end of long high-voltage transmission lines are the power transformers. The distribution transformer (generally pole mounted) are those installed in the localities of the city to provide utilization voltage at the consumer terminals.
- Power transformers generally operate at nearly full-load. However, distribution transformers operate at light loads during major part of the day.
- The performance of a power transformer is generally judged from commercial efficiency whereas the performance of a distribution transformer is judged from all-day efficiency
- The rating of a power transformer is many times greater than that of a distribution transformer