Determination of DOL starting or Star-Delta starting

dody_indra
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When to use direct on line starting or star-delta starting on an electric motor? Does it depend on the capacity of the motor itself?

Asked by dody_indra on 11/15/2011 9:33:35 PM

The Best Answer

Steven
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It does not really depend on the size, but on the system it’s self. I have started some very large motors DOL. Some regulations/authorities do request motors above a certain size (3 kW or similar) to use star-delta. My understanding is that regulations like this are a bit of a make it easy and safe type of thing; with most of the authorities allowing deviations given sufficient technical justification (no guarantees though).

There are also a couple of posts on the site you may want to look at:

Direct On Line - http://myelectrical.com/opinion/entryid/79/motor-starting-direct-on-line
Star Delta - http://myelectrical.com/opinion/entryid/83/motor-starting-star-delta

Answered by Steven on 11/17/2011 8:02:19 AM

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