MID SEM -I SYLLABUS 7 TH SEM - SUB - SWITCH GEAR AND PROTECTION (2170908)

MID SEM -I SYLLABUS  7 TH SEM 
SUB - SWITCH GEAR AND PROTECTION (2170908)


1-    Introduction to Protective Relaying and electromagnetic relays

       Faults, Causes and Effects, Protective Zones, Primary and Backup Protection, Desirable Qualities   and Terms of Protective Relaying, Basic Connection of Trip Circuit, Types of Relay Units, Relay Pick up, Reset or Drop out, Pick up/ Drop off Ratio, Construction and Working of Different Electromagnetic Relays.

2   Over Current Protection of Transmission line

Introduction, Fuse, Thermal Relays, Over Current Relays, Application of Definite Time & IDMT O.C. Relays for Protection of Feeder, Directional Over Current Relay, Limitations of O.C. Relays 

3   Differential Protection

Simple Differential Protection, Zone of Protection and Actual Behavior

of Simple Differential Protection, Percentage Differential Protection,

Earth Leakage Protection

5 Distance Protection of Transmission line

Drawbacks of O.C. Protection, Introduction to Distance Protection,

Types of Distance Relay, Impedance, Reactance, MHO Relay,

Performance of Distance Relay During Normal Load and Power Swing,

Effect of Arc Resistance on Reach of Distance Relays, Comparison of

Distance Relays, Distance Protection of Transmission line.

6 Theory of circuit Interruption

Introduction, Physics of arc phenomena, Maintenance of the arc, Losses

from plasma, Essential properties of arc, Arc interruption theories

7 Circuit Constant in Relation to Circuit Breaking

Introduction, Circuit breaker rating, Circuit constants & circuit

conditions Re-striking voltage transient Characteristics of re-striking

voltage, Interaction between the breaker & circuit, Current chopping,

duties of switch gear.

EXAMPLES RELATED TO ABOVE TOPICS