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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. Breaker s. 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. 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.
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.
2.
T. S. MadhavRao, “Power System Protection Static relays with Microprocessor Applications” , TMH Publication, 2nd Edition, 2006.
3.
C.L. Wadhwa, “Electrical Power Systems” , New Age International (P) Limited, Publishers, 5th Edition, 2009.
4.
B.L. Soni, Gupta, Bhatnagar, Chakrabarthy, “A Text book on Power System Engineering” , DhanpatRai & Co, 2008.
5.
Warrington and Coll, “Protective Relays”, Vol I & II. pqr
G V P College of Engineering (Autonomous)
2013