PHASE ANGLE SHIFT AND SLOPE BASED RESTRAINT FOR INDIRECT SYMMETRICAL PHASE SHIFT TRANSFORMER PROTECTION. J. eng. sustain. dev. [Internet]. 2024 May 1 [cited 2024 Jun. 29];28(3):316-32. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/2335