Power System Protection(EEE 3-2)



Course Objectives: 
The objectives of the course are to make the students learn about:
 The different types of electromagnetic relays and microprocessor based relays
 The protection of Generators
 The protection of Transformers
 The protection of feeders and lines
 The technical aspects involved in the operation of circuit breakers
 Generation of over voltages and protection from over voltages

UNIT – I
RELAYS
Electromagnetic Relays - Basic Requirements of Relays – Primary and Backup Protection - Construction Details of – Attracted Armature, Balanced Beam, Inductor Type and Differential Relays – Universal Torque Equation – Characteristics of Over Current, Direction and Distance Relays. Static Relays – Advantages and Disadvantages – Definite Time, Inverse and IDMT. Static Relays – Comparators –Amplitude and Phase Comparators. Microprocessor Based Relays – Advantages and Disadvantages – Block Diagram for Over Current (Definite, Inverse and IDMT) and Distance Relays and Their Flow Charts.

UNIT – II
PROTECTION OF GENERATORS & TRANSFORMERS
Protection of Generators Against Stator Faults, Rotor Faults and Abnormal Conditions. Restricted Earth Fault and Inter-Turn Fault Protection. Numerical Problems on percentage winding unprotected. Protection of Transformers: Percentage Differential Protection, Numerical Problems on Design of CT Ratio, Buchholtz Relay Protection, Numerical Problems.

UNIT – III
PROTECTION OF FEEDERS & LINES
Protection of Feeder (Radial & Ring Main) Using Over Current Relays. Protection of Transmission Line – 3 Zone Protection Using Distance Relays. Carrier Current Protection. Protection of Bus Bars.

UNIT – IV
CIRCUIT BREAKERS
Circuit Breakers: Elementary Principles of Arc Interruption, Restriking Voltage and Recovery Voltage - Restriking Phenomenon, Average and Max. RRRV, Numerical Problems - Current Chopping and Resistance Switching - CB Ratings and Specifications: Types and Numerical Problems. – Auto Reclosures. Description and Operation of Following Types of Circuit Breakers: Minimum Oil Circuit Breakers, Air Blast Circuit Breakers, Vacuum and SF6 Circuit Breakers.

UNIT – V
OVER VOLTAGES IN POWER SYSTEMS
Generation of Over Voltages in Power Systems.-Protection against Lightning Over Voltages - Valve Type and Zinc-Oxide Lighting Arresters - Insulation Coordination –BIL.

Study Material's for Power System Protection

Complete Lecture Notes: Download
Power System Protection( Total PPT): Download
2 Marks for 5 Units: Download
Important Questions: Download

Unit-1:
Relays: Download

Unit-2:
Protection Of Generator:  Download 
Protection Of Transformer: Download

Unit-3:
Protection Of Feeders: Download
Protection Of Lines: Download

Unit-4:Circuit Breaker: Download

Unit-5:
Over Voltages In Power Systems: Download


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