Megawatt Inrush And Small Generators
In the interests of accuracy I have copied John Marles, comments verbatim and they appear below "Inrush is 50A/115VAC 50A/230VAC for a few milliseconds on the S-400 and S-350. Its controlled by due...
Forum Discussion
red31 wrote,
"I thought is charged and discharged at the freq of the AC, like 60 times a second."
Exactly correct!
"I thought its purpose is to reduce torque of a starting spinning thingy & reduce pf by shifting the voltage/current waves."
Not quite. The purpose of the starting capacitor is to create a phase shift in the starting winding. This phase shift creates a rotating magnetic field in the motor. A rotating magnetic field is needed to get the motor armature turning. After it starts turning the starter winding is no longer needed and is disconnected automatically. The start capacitor has nothing to do with power factor.
"I thought is charged and discharged at the freq of the AC, like 60 times a second."
Exactly correct!
"I thought its purpose is to reduce torque of a starting spinning thingy & reduce pf by shifting the voltage/current waves."
Not quite. The purpose of the starting capacitor is to create a phase shift in the starting winding. This phase shift creates a rotating magnetic field in the motor. A rotating magnetic field is needed to get the motor armature turning. After it starts turning the starter winding is no longer needed and is disconnected automatically. The start capacitor has nothing to do with power factor.
