1. Engineering Technology Division
Power Plant Construction and QA/QC
Section 4.2 – Transformer and Transformer Protection

2. Power (watts) = Current (amps) X Voltage (volts) P=IE
Section 4.2 – Transformer and Transformer Protection
Overview
Power (watts) = Current (amps) X Voltage (volts) P=IE
Transformers change voltage to usable values
Dry and wet types – cooling mechanism
Dry – Smaller, Wet – Larger
EFI – Electrical Field Interference – Monitors, TVs
Rating basis on K Factor – volt-amps
K Factor identifies load capacity

3. Section 4.2 – Transformer and Transformer Protection
K Rating

4. Section 4.2 – Transformer and Transformer Protection
K Rating

5. Section 4.2 – Transformer and Transformer Protection
Construction

6. Section 4.2 – Transformer and Transformer Protection
Construction

7. Types Section 4.2 – Transformer and Transformer Protection Air Cooled
Oil Cooled

8. Overvoltage – switching surges and lighting – surge arrestors
Section 4.2 – Transformer and Transformer Protection
Protection
Overvoltage – switching surges and lighting – surge arrestors
Overcurrent – Overloading, short circuits – fuses, circuit breakers
Temperature
Current
Voltage

9. Section 4.2 – Transformer and Transformer Protection
Questions?