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Training course on transformers and three phase supply

tommatwalker

Good morning all,

I'm looking for recommendations on a training course in three phase supply, types of transformers and their safety and testing. I've got a good basic knowledge of the types of transformers but I am conscious that a gap in my knowledge is the differences between them and the safety implications of using the different types. Apologies this is a bit vague but I'm not really sure what else to ask! Any recommendations would be extremely helpful.

Thanks in advance!

Tom

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    In the UK the substations are normally delta on the high side and star on the secondary (sometimes indicated by Dy - the big letter for the bigger voltage.) There may be a 'clocking number' to indicate the phase shift.

    e.g.the commmon Dyn 11 means that the voltage of the secondary star winding leads the primary phase voltage by 30 degrees and it corresponds to "11 o'clock."

    rather more than you probably want on that here https://electrical-engineering-portal.com/understanding-vector-group-transformer-1

    If you have a delta winding you do not have a place to call 'neutral' unless you create it specially with a star of identical impedance.

    Neutral does not have to be in the middle of the 3 phases.... Some American designs ground mid point of the side of a delta, so the three phase voltages are now NOT equal relative to ground (but have equal voltages relative to each other of course.) more on that here https://www.electricalclassroom.com/high-leg-delta-connection/

    Mike

    .

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  • 0

    In the UK the substations are normally delta on the high side and star on the secondary (sometimes indicated by Dy - the big letter for the bigger voltage.) There may be a 'clocking number' to indicate the phase shift.

    e.g.the commmon Dyn 11 means that the voltage of the secondary star winding leads the primary phase voltage by 30 degrees and it corresponds to "11 o'clock."

    rather more than you probably want on that here https://electrical-engineering-portal.com/understanding-vector-group-transformer-1

    If you have a delta winding you do not have a place to call 'neutral' unless you create it specially with a star of identical impedance.

    Neutral does not have to be in the middle of the 3 phases.... Some American designs ground mid point of the side of a delta, so the three phase voltages are now NOT equal relative to ground (but have equal voltages relative to each other of course.) more on that here https://www.electricalclassroom.com/high-leg-delta-connection/

    Mike

    .

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