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  • Users: MacCB
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  1. MacCB

    Switching or turning on a 3000 kVA transformer with a soft starter (SS) - to reduce inrush current

    Hi Spgema, Yes, the SS works with anti parallel thyristors in each phase, and by that control the URMS value. Usually the SS applications are for drives, where you want to limit the torque (T=f(Usquared) at starting to protect the working machine. The disadvantage is the longer starting time...
  2. MacCB

    Failures and failure rates for 5MVAR transformers at 24hrs soak test

    Hi Lds & Gent's, Can anyone out there refer to any report on the subject? The only argument I've found is: "That is common recommendation from the trf vendors manual to complete a 24hrs soak test at commissioning". But what kind of failures or malfunction would you reveal during this period, and...
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