Power System 19

Electromagnetic Attraction type relay

Electromagnetic Induction Relay

Watt Hour meter relay

Impedance relay

contains one shunt magnet

contains highly inductive PC

contains PSB

basically a non directional relay

Fault current is inversely proportional to PSM

Fault current is directly proportional to PSM

Fault current is directly proportional to square root of PSM

Fault current has no relation with PSM

Reverese Active Power flow

Reverese Reactive Power flow

Reverese Complex Power flow

None

Watt Hour Meter type relay is Non directional

Watt Meter type relay is directional 

Overcurrent relays are directional

Mho relay is directional

A, B, D 

OC relay

directional relay

both are same

CB

failure of a relay in its own prescribed area

failure of a relay for beyond its prescribed area

functioning of a relay for inside and beyond its prescribed area

None of the above