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  1. ovide

    autotransformer secondary fault currents

    Hi BasicBill: The answer is " it depends how accurate an answer you want". I'll do an example : a Utility feeds a transfo (T1) rated 1000kva/ 480v-3ph secondary and z=5%. Assume the utility is infinite (an approximation). The 3ph fault at secondary of T1 is 1000kva/(.48kv*1.732*.05)=24ka . This...
  2. ovide

    power load flow calculations

    I trying to learn to do some basic load flow calcs; I have 1 bus ( 13.8kv ) with two sources --- a utility supply of a 30mva/z=10% transfo and a plant generator of 20mva/16mw/x"=12%. The load connected on this same bus is 20mw/25mva/motor x'=15%. The impedance connecting the load to the main bus...

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