Solid State Transformer

Discussion in 'General Electronics Chat' started by Dynamic_Thom, Sep 11, 2015.

  1. Dynamic_Thom

    Thread Starter New Member

    Jul 16, 2015
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    0
    What is the difference between a regular and solid state soft starter?
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
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    428
    non solid state soft starts are usually resistors switched in series with a motor by relays, solid state soft starts are modified VFD's that bring up the frquency slowly to limit motor starting current.
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,545
    2,370
    One 'regular' older method was to use star/delta switching to bring a large motor with a load up to speed reducing the starting current, the S.S. is as alcliff mentions, rpm is brought up to speed by V.F.
    Another sometimes seen was series inductors inserted into the line on start.
    Max.
     
  4. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
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    there are also soft starts for large VFS's, a resistor is placed in series with the charge line for the capacitor bank after the three phase rectifyer to reduce the huge start current of a whole door full of 6000 mfd caps in paralell on one brand.
     
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