Electrician Talk banner
1 - 15 of 15 Posts

· Bilge Rat
motors and controls.........
Joined
·
9,951 Posts
1) What type of load is the motor starting, this will determine the KVA rating of the transformer, as well as the starting voltage applied to the motor.

2) In addition to the above, how long can the motor stand starting current? A NEMA motor can take a LOT more than an IEC one. This will determine how long the transformer stays in the circuit.

3) Design the control circuit around the above.
 

· Registered
Joined
·
5,749 Posts
Motor starting autotransformers are sold as definite purpose devices based on HP (or kW). So when you find a supplier, just tell them the motor size, they will already have a design for it. You do not do this by using an off the shelf distribution transformer, it will not have the necessary taps, it will be too expensive and too big.

Why you would do this is questionable. By the time you are done with your engineering time component cost and wiring time, you could have bought two solid state soft starters.
 
1 - 15 of 15 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top