07/03/23 12:03:08
@study @py7002
- How common is an inductive load, or, it doesnt really matter, if one exists at all you’ve to do this reactive power balancing act?
- Why do we need 3 phase power?
Why do we need 3 phase power
- We see that for single phase instantaneous AC power we’ve . There’s a constant aspect and then an oscillating component to the power.
- This second term can reverse, so it represents reactive power.
- This translates into uneven torque.
- Three phase delivers a more steady power.
Why circuits draw more current when the load increases
- Impedance is dependent on frequency, as a load is addded to the shaft the impedance also decreases.
- If you’re trying to maintain voltage, with an increase in required output power, the current must increase.
- In a wye connected circuit you’ve a ‘phase’ voltage and a ‘line’ voltage.
- Phase is across a winding. Line is across phases or windings.
- When you’re measuring line voltages you’re adding phasors.
- A motor is a balanced load. If you put a neutral in it, it would carry no current.