ABSTRACT
Chapter 5 provides an overview of the protective relaying system. The main focus is on the overcurrent and differential protection functions. It provides information on the different types of overcurrent protection relays, characteristic curve analysis on the time-overcurrent protection functions and grading principles. The balanced current and voltage differential protection functions, and percentage restraint differential principles are covered in the chapter. Use case studies on time-overcurrent protection, relay-to-relay coordination and transformer differential protection functions are analysed using DigSilent simulation models. In addition, solved and unsolved examples on protective relaying system are provided.
