Protective Relaying: Principles and Applications
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Donald Reimert. Protective Relaying: Principles and Applications, Third. Edition, J. Lewis Blackburn and Thomas J. Domin ß by Taylor & Francis Group.
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For many years, Protective Relaying: Principles and Applications has been the go-to text for gaining proficiency in the technological fundamentals of power system protection. - Classification Of Protective Relay. Protective relaying plays an important role in minimizing the faults and also in minimizing the damage in the event of faults.
Technological advances and structural changes within the electric utility industry mandate that protection engineers develop a solid understanding of the related new technologies as well as of power system operations and economics in order to function proficiently. Continuing in the bestselling tradition of the previous editions by the late J. Lewis Blackburn, Protective Relaying: Principles and Applications, Third Edition retains the fundamentals of protection relays and power system protection while incorporating new developments in the field. Thoroughly updated and revised, this third edition focuses on technological changes in the design of protective systems, the practical concerns of power system protection encountered by users, and the techniques for protecting typical facilities used in modern power systems. Formerly known as Handbook of Power System Engineering, this second edition provides rigorous revisions to the original treatment of systems analysis together with a substantial new four-chapter section on power electronics applications.
Protective relays using electrical quantities are connected to the power system through current transformer CT or voltage transformer VT. These input devices or instrument transformers provide insulation from the high-power system voltages and reduce the magnitudes to practical secondary levels for the relays. The protective relay system is connected to the AC power system through the CTs commonly associated with the circuit breaker and, if necessary, to the VTs. These are shown connected to the station AC bus, but often at the higher voltages the voltage devices are connected to the transmission line. Thus, when the circuit breaker is closed and in service, its 52a contact is closed.