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Discuss Differential Protection testing of a 3-phase transformer in the Industrial Electrician Talk area at ElectriciansForums.net

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speedtronic

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For Differential protection testing of a three phase Power T/F using secondary injection test set, how do we know the correct value of current to pe applied(value at which relay picks up)? Does OEM provide these values in Instruction manual or Electrical Engineers calculate these values themselves ? If yes then kindly explain these calculations with an example of 3-phase T/F?
Moreover, are these calculations based on per unit system?
 
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