Module 7 : Out of Step Protection
Lecture 24 : Power Swings and Distance Relaying
 

Determination of power swing locus (contd..)

  Now, the impedance seen by relay is given by the following equation,
 
 

                                                                                                                  

  (14)
 
 

Let us define . Assuming for simplicity, both the voltages as equal to 1pu, i.e. k = 1. Then,

                                                                                                                        (15)
 
   
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