# Switchgear & Protection

Course Code:10EE62

Author:uLektz

Regulation:2010

Categories:Electrical & Electronics

Format : ePUB3 (DRM Protected)

Type :eBook

Rs.199 Rs.30 Rs.85% off

Description :Switchgear & Protection of 10EE62 covers the latest syllabus prescribed by Visvesvaraya Technological University, Karnataka (VTU) for regulation 2010. Author: uLektz, Published by uLektz Learning Solutions Private Limited.

Note : No printed book. Only ebook. Access eBook using uLektz apps for Android, iOS and Windows Desktop PC.

##### Topics
###### UNIT - I SWITCHES AND FUSES

1.1 Introduction, Energy management of power system

1.2 Definition of switchgear, switches - isolating, load breaking and earthing

1.3 Introduction to fuse, fuse law, Cut -off characteristics: Time current characteristics

1.4 Fuse material, HRC fuse, liquid fuse, Application of fuse

###### UNIT - II PRINCIPLES OF CIRCUIT BREAKERS

2.1 Introduction, requirement of a circuit breakers, difference between an isolator and circuit breaker, basic principle of operation of a circuit breaker

2.2 Phenomena of arc, properties of arc, initiation and maintenance of arc, arc interruption theories - Slepian’s theory and energy balance theory

2.3 Restriking voltage, recovery voltage, Rate of rise of Restriking voltage

2.4 DC circuit breaking, AC circuit breaking

2.5 Current chopping, capacitance switching, resistance switching

2.6 Rating of Circuit breakers

###### UNIT - III CIRCUITS BREAKERS

3.1 Air Circuit breakers – Air break and Air blast Circuit breakers

3.2 Oil Circuit breakers - Single break, double break, minimum OCB

3.3 SF6 breaker - Preparation of SF6gas, Puffer and non Puffer type of SF6 breakers

3.4 Vacuum circuit breakers - principle of operation and constructional details

3.6 Testing of Circuit breakers, Unit testing, synthetic testing, substitution test, compensation test and capacitance test

###### UNIT - IV LIGHTNING ARRESTERS

4.1 Causes of over voltages – internal and external, Lightning, Working principle of different types of lightning arresters

4.2 Shield wires

###### UNIT - V PROTECTIVE RELAYING

5.1 Requirement of Protective Relaying, Zones of protection, primary and back-up protection

5.2 Essential qualities of Protective Relaying, Classification of Protective Relays

###### UNIT - VI INDUCTION TYPE RELAY

6.1 Non-directional and directional over current relays, IDMT and Directional characteristics

6.2 Differential relay – Principle of operation

6.3 Percentage differential relay, bias characteristics

6.4 Distance relay – Three stepped distance protection, Impedance relay, Reactance relay, Mho relay

6.5 Buchholz relay

6.6 Negative Sequence relay

6.7 Microprocessor based over current relay – block diagram approach

###### UNIT - VII PROTECTION SCHEMES

7.1 Generator protection, Merz price protection, Prime mover faults, Stator and rotor faults

7.2 Protection against abnormal conditions - Unbalanced loading, Loss of excitation, Over speeding

###### UNIT - VIII PROTECTION SCHEMES

8.1 Transformer protection - Differential protection, Differential relays with harmonic restraint, Inter turn faults

8.2 Induction motor protection - Protection against electrical faults such as phase fault, Ground fault

8.3 Abnormal operating conditions such as single phasing, phase reversal, overload