13 8 SWITCHGEAR AND PROTECTION Course Code: 13EE1119 L 4 T 0 P 0 C 3 Pre requisites: Electrical Machines and Power Transmission Engineering Course Educational Objectives: ✤ To discuss the need for the protection and various protection schemes. ✤ To study different relays characteristics character istics ✤ To understand the method of circuit breaking, arcing phenomena – various arc theories theories - capacitive and inductive inductive breaking Course Outcomes: ✤ Students acquire knowledge in the field of power system protection, circuit breakers and relays. ✤ Students will gain ability to design the relevant protection systems for the main elements of a power system. UNIT-I ( 12 L ec tu re s) CIRCUIT BREAKERS: Principle of operation – RRRV – Current chopping- Circuit Breaker ratings and specifications, specifica tions, Testing Testing of Circuit Breakers. Constructi onal features and selection Constructional select ion of LT LT breakers (Miniature circuit circui t breakers/Metal clad circuit breakers/Earth leakage circuit breaker) and HT breakers (Air blast circuit breaker-Oil circuit breakers-SF6 CBVacuum Circuit Circuit Breakers) Breakers) UNIT-II ( 12 L ec t u re s ) PROTECTIVE RELA RELAYS-I: YS-I: Electromagnetic Relays: Principle of Operation and Construction of Attracted armature, Balanced Balanc ed Beam, induction Disc and Induction Cup relays. Relays Classification: Instantaneous, DMT and IDMT types, G V P College of Engineering (Autonomous) 2013 13 9 Application of relays: Over current, Under voltage, Directional, Differential and Percentage Differential. UNIT-III (12 Lectures) PROTECTIVE RELAYS-II: Universal Torque Equation, Distance relays: Impedance, Reactance and Mho and Off-Set Mho relays, Characteristics of Distance Relays and Comparison.

Switchgear Protection And Power Systems has 272 ratings and 20 reviews. 3.87 Rating details 272 ratings 20 reviews Get A Copy. Shelves: switchgear-and-protection. I want to read this book. Flag Like see review.

Static Relays, Static Relays verses Electromagnetic Relays. Microprocessor Based Relays: impedance, directional, reactance, Mho & offset Mho and mathematical expression for distance relay.

UNIT-IV (12 Lectures) PROTECTION OF GENERATORS, TRANSFORMERS, FEEDERS AND BUS BARS: Protection of Generators against Stator faults, Rotor faults, and Abnormal Conditions. Restricted Earth Fault, Numerical Problems on% Winding Unprotected. Percentage Differential Protection of transformers, Numerical Problems on Design of CT’s Ratio, BUCHHOLTZ Relay Protection Protection of transmission Lines: Over Current, Carrier Current and Three-zone Distance Relay Protection using Impedance Relays.

Translay Relay. Protection of Bus bars – Differential protection. UNIT-V (12 Lectures) GROUNDING TECHNIQUES & OVER VOLTAGE PROTECTIONS: Grounded and Ungrounded Neutral Systems- Effects of Ungrounded Neutral on system performance- Methods of Neutral Grounding, Arcing Grounds and Grounding Practices. Protection against Over Voltages- Volt-Time Characteristics- Valve type and Zinc-Oxide Lighting Arresters - Insulation Coordination-BIL, Impulse Ratio, Standard Impulse Test Wave. TEXT BOOKS: 1. C R Mason, “Art& Science of Protective Relaying”, Wiley Eastern Ltd. G V P College of Engineering (Autonomous) 2013 14 0 2.

Selected spindle SP Viscosity reading cP (mPas) or cSt Percentage of full scale% Sample temperature ºC or ºF Shear Rate (with coaxial spindles) SR (s-1) Shear Stress (with coaxial spindles) SS (N/m2) Density (introduced by the user) g/cm3 Step Program Status Analyze & visual characteristics (flow curves) > iscosity reading: dynamic viscosity (cP or mPas) or kinematics V viscosity (cSt). Fungilab viscometer manual. > Direct readout on a graphic display. > Data displayed: Selected speed r.p.m. > Program features: Time to torque: target torque pre-setting device. > Touch key board 12 keys.

Sunil S Rao, “Switchgear Protection and Power Systems”, Khanna Publishers, New Delhi, 11th Edition reprint 3rd Edition, 2008 REFERENCES: 1. Badri Ram, Viswakarma.D.N., “Power System Protection and Switchgear”, TMH Publications, 2 nd Edition 2011. MadhavRao, “Power System Protection Static relays with Microprocessor Applications”, TMH Publication, 2nd Edition, 2006. Wadhwa, “Electrical Power Systems”, New Age International (P) Limited, Publishers, 5th Edition, 2009.

Ivona text to speech with crack all voices. Soni, Gupta, Bhatnagar, Chakrabarthy, “A Text book on Power System Engineering”, DhanpatRai & Co, 2008. Warrington and Coll, “Protective Relays”, Vol I & II. Pqr G V P College of Engineering (Autonomous) 2013.