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Topic Title: delta winding protection
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Created On: 24 November 2009 03:33 PM
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 24 November 2009 03:33 PM
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We are reviewing a system which has a two transformer secondary output star & delta.

The installation is within a printing facility, I understand this is common practice to supply the drives.

Would the output of the delta winding be classed as an IT system as the delta winding is not connected to earth ??
 24 November 2009 07:16 PM
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this would possibly had been for supplying large thyristor drives and would then have gone to a 12 pulse bridge on an inverter or something similar. The Delta connection could be 30 degree shifted from the Star point.
 24 November 2009 07:44 PM
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Yes that would be a IT system, assuming there is no earth connection.
There are certain precautions that have to be taken on IT systems, including fitting an earth monitoring system to look for a single earth fault.
See HSE safety notice 9/2005 Safe opperation and maintenance of unearthed electrical distribution systems

Edited: 24 November 2009 at 07:51 PM by ArthurHall
IET » Energy » delta winding protection

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