Computer Relaying for Power Systems, 2nd Edition
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If the measured voltage is lesser, that means the fault is nearer and vice versa. Hence the protection called Distance relay. The load flowing through the line appears as an impedance to the relay and sufficiently large loads as impedance is inversely proportional to the load can lead to a trip of the relay even in the absence of a fault. A differential scheme acts on the difference between current entering a protected zone which may be a bus bar, generator, transformer or other apparatus and the current leaving that zone.
A fault outside the zone gives the same fault current at the entry and exit of the zone, but faults within the zone show up as a difference in current. The boundary of the protected zone is uniquely defined by the location of the current transformers. Time grading with other protection systems is therefore not required, allowing for tripping without additional delay. Differential protection is therefore suited as fast main protection for all important plant items.
Differential protection can be used to provide protection for zones with multiple terminals   and can be used to protect lines,  generators, motors, transformers, and other electrical plant. Current transformers in a differential scheme must be chosen to have near-identical response to high overcurrents. If a "through fault" results in one set of current transformers saturating before another, the zone differential protection will see a false "operate" current and may false trip.
GFCI ground fault circuit interrupter circuit breakers combine overcurrent protection and differential protection non-adjustable in standard, commonly available modules. A directional relay uses an additional polarizing source of voltage or current to determine the direction of a fault.
Directional elements respond to the phase shift between a polarizing quantity and an operate quantity. A synchronism checking relay provides a contact closure when the frequency and phase of two sources are similar to within some tolerance margin. A "synch check" relay is often applied where two power systems are interconnected, such as at a switchyard connecting two power grids, or at a generator circuit breaker to ensure the generator is synchronized to the system before connecting it.
From Wikipedia, the free encyclopedia. Main article: Digital protective relay. Transmission Network Protection. CRC Press. Retrieved 30 December Retrieved Texas Instruments. Russell January 15, The Art and Science of Protective Relaying. January Protective Relays.
Springer US. Electricity Council ed. Power System Protection: Systems and methods. London: Peter Peregrinus. Principles of Power System 4th ed. S Chand. July Fundamentals of Power System Protection 2nd ed. PHI Learning.
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Protection of Power System. Technical Publications. Power System Protection and Switchgear. S Madhava Power System Protection: Static Relays 2nd ed. New Dehli: India Professional. Switchgear and Power System Protection. PAS 4 : — PAS 3 : — Digital Protection for Power Systems. IET Digital Library.
Computer Relaying Power Systems by Arun Phadke - AbeBooks
Understanding microprocessor-based technology applied to relaying Report. New Dehli: New Age International.
October Levallois-Perret, France: Alstom. A; Imran, A.
Algorithms and hardware design of modern numeric overcurrent and distance relays. Second International Conference on Electrical Engineering, ICEE Development of DSP based high speed numerical distance relay and its evaluation using hardware in loop power system simulator. Protection relay settings management in the modern world PDF. Practical Power System Protection.
Computer Relaying for Power Systems - Economy Edition
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View on Wiley Online Library. This is a dummy description. Since publication of the first edition of Computer Relaying for Power Systems in , computer relays have been widely accepted by power engineers throughout the world and in many countries they are now the protective devices of choice. Provides the student with an understanding of computer relaying Authored by international authorities in computer relaying Contents include relaying practices, mathematical basis for protective relaying algorithms, transmission line relaying, protection of transformers, machines and buses, hardware organization in integrated systems, system relaying and control, and developments in new relaying principles Features numerous solved examples to explain several of the more complex topics, as well as a problem at the end of each chapter Includes an updated list of references and a greatly expanded subject index.
Table of contents About the Authors. Preface to the First Edition. Preface to the Second Edition. Glossary of Acronyms.