Sizing of auto-transformer
Posted 10 January 2006 - 05:47 AM
Basically what are the assumptions that should be taken in consideration when sizing auto-transformer starter example for a 185 k W 3 phase 400 V application.
Posted 11 January 2006 - 04:07 AM
Example: http://www.olsun.com/sm2.html (sorry, I only have references for US mfgrs.)
Posted 11 January 2006 - 05:03 AM
Posted 11 January 2006 - 11:40 PM
When selecting/sizing an auto-transformer starter the following should be considered.
Motor nameplate kW and Amps
Which voltage tapping will best suit the load
What is the anticipate voltage tapping
Number of starts ie equally spaced and consequtive
Once those details are known provide them to the aut-transformer manuacturer and they will design/build a transforemr to suit your application.
Alternative, standard transformers are available from a variety of different suppliers (or at least they are in Australia anyway). These are normally designed for 3, 10 or 30 starts per hour with each start cycle not exceeding 10 seconds.
I hope the above helps.
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