Electrical Power

1. Electrical Power J. Mitchell for AE-210

2. What Does Electrical Power Do? • Provides Energy for Buildings • Usually all except Heating

3. How is that Power Used? • User’s Equipment • Computers • Machinery etc. • Lighting • Major Equipment • Emergency

4. Review of Basics • Power (P) is a constant = Volts * Amps (V*A) • Lost power = Current2 * Resistance (I2*R) • Therefore making current as small as possible reduces lost power • Can Transform Power • When Increase Voltage, Decrease Current • Therefore long distance at very high voltages

5. Distribution of Power • Power companies make far from where we need it • Transform it to high AC Voltage to reduce current so little lost in transmission • Typically 230,000 Volts or higher • Must have big separation between wires – therefore the transmission lines we see. • “Step” it down as gets to end user • Transformers we see at substations on Poles etc.

6. Typical Voltages for Distribution

7. Transformers Rated in KVA – Kilo-Volt Amperes This is a 1000KVA Transformer

8. Substation • Consists of • Fuse • Meters • Transformer • Switches / Panels • Conduits Leading out

9. Distribution Runs In Buildings • Chases – Vertical shafts allowing runs • Bus Duct - allows exposed wires • Conduit & EMT -

10. Distribution Panels in Buildings • Contain Circuit Breakers

11. Outlets & Switches