MID SEM EXAM SYLLABUS FOR 7 TH SEM, SUB: SWITCH GEAR AND PROTECTION (2170908)

7TH SEM ELECTRICAL 

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

4   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.

5 Theory of circuit Interruption

Introduction, Physics of arc phenomena, Maintenance of the arc, Losses from plasma, Essential properties of arc, Arc interruption theories.

6  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.

7

Theory & Practice of Conventional Circuit Breaker and modern circuit breakers

Automatic switch, Air-break circuit breakers, Oil circuit breakers, Single and multi break Construction, Air-blast circuit breaker.