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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