Recently I have gotten myself into sizing medium and low voltage switchgear and I have several questions.
Where can I find some good general sizing rules for switchgear, such as:
- Bus sizing taking into consideration MCC loading and other sources.
- Tie switch sizing in main-tie-main...
I'm a little confused about the name plate data on a transformer.
I am trying to find the Nominal KVA and Full Load KVA for a tranformer.
Here is the name plate data:
Westinghouse 4160 - 480Y/277 60 Hz 3 phase
Type RSL Unit Substation Transformer
Class OA
Full Load KVA = 2000/2240
Deg C...
We have several large motors with possible VFD applications, but I have some concerns. The motors are 1960's vintage. There is a good possibility they have been revarnished sometime in the past.
My question is, where can I find a good list of requirements which have to be met for successful...
We have a 6k, 6.9kV Rotor Would Indiction motor that was probably built back in 40's. It is connected to a Liquid Rheostat control that is probably just as old as the motor.
There isn't too much documentation on the liquid rheostat. Does anyone know where I can find some good information about...
I'm trying to find what the advantage would be of using a VFD vs a soft start on a motor
Motor: 460V
350HP
What would we save if on average I ran three pumps at 75% using VFD vs running them at 100%.
I understand that VFD has some losses associated with it, and the losses increase as you...
This is a simple question. I am trying to calculate electricity usage of a large motor:
3 Phase
20,000 HP
Voltage 13800
Idling: 280 Amps
Motor PF Rated: 0.8
Actual PF: 0.2
KW = (13800 * 280 * 1.73 * 0.2)/1000 = 1336.9KW
My question is, power factor plays a big role when it comes to power...
