Aug 15, 2013 - “Switchgear Protection and Power Systems: Theory, Practice and Solved Problems” by Sunil S Rao. To mention that we don't have free downloadable pdf copies of these good books and one should look for free pdf copies.

Complete Notes Link – Unit 2 Link – Unit 3 Link – Unit 4 Link – Unit 5 Link – Unit 6 Link – Old Material Links Switchgear and Protection Notes Details UNIT – I Circuit Breakers-1 Circuit Breakers: Elementary principles of arc interruption, Recovery, Restriking Voltage and Recovery voltages.- Restriking Phenomenon, Average and Max. RRRV, Numerical Problems – Current Chopping and Resistance Switching – CB ratings and Specifications: Types and Numerical Problems. – Auto reclosures UNIT – II Circuit Breakers-2 Description and Operation of following types of circuit breakers: Minimum Oil Circuit breakers, Air Blast Circuit Breakers, Vacuum and SF6 circuit breakers. UNIT – III Electromagnetic and Static Relays The principle of Operation and Construction of Attracted armature, Balanced Beam, induction Disc and Induction Cup relays.

Relays Classification: Instantaneous, DMT and IDMT types. Application of relays: Over current/ Under voltage relays, Direction relays, Differential Relays, and Percentage Differential Relays. Universal torque equation, Distance relays: Impedance, Reactance and Mho and Off-Set Mho relay, Characteristics of Distance Relays and Comparison. Static Relays: Static Relays verses Electromagnetic Relays UNIT – IV Generator Protection Protection of generators against Stator faults, Rotor faults, and Abnormal Conditions.

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Restricted Earth fault and Inter-turn fault Protection. Numerical Problems on% Winding Unprotected. UNIT – V Transformer Protection Protection of transformers: Percentage Differential Protection, Numerical Problem on Design of CT s Ratio, Buchholtz relay Protection. Switchgear and Protection Notes – SGP Notes Details UNIT – VI Feeder and Bus-Bar Protection Protection of Lines: Over Current, Carrier Current and Three-zone distance relay protection using Impedance relays.

Translate Relay. Protection of Bus bars – Differential protection. UNIT – VII Neutral Grounding Grounded and Ungrounded Neutral Systems.- Effects of Ungrounded Neutral on system performance. Methods of Neutral Grounding: Solid, Resistance, Reactance – Arcing Grounds and Grounding Practices. UNIT – VIII Protection against overvoltages Generation of Over Voltages in Power Systems.-Protection against Lightning Over Voltages – Valve type and Zinc-Oxide Lighting Arresters – Insulation Coordination -BIL, Impulse Ratio, Standard Impulse Test Wave, Volt-Time Characteristics. TEXTBOOKS: Switchgear and Protection Notes – SGP Notes – SGP Pdf Notes • Switchgear and Protection – by Sunil S Rao, Khanna Publishers • Power System Protection and Switchgear by Badari Ram, D.N Viswakarma, TMH Publications REFERENCE BOOKS: Switchgear and Protection Notes – SGP Notes – SGP Pdf Notes • Fundamentals of Power System Protection by Paithankar and S.R.Bhide.,PHI, 2003 • Art & Science of Protective Relaying – by C R Mason, Wiley Eastern Ltd. • Electrical Power Systems – by C.L.Wadhwa, New Age International (P) Limited, Publishers, 3rd edition • A Textbook on Power System Engineering by B.L.Soni, Gupta, Bhatnagar, Chakrabarthy, Dhanpat Rai & Co.