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Electromagnetic Relays • Attracted Armature Type • Induction Disc Type • Induction Cup Type • Moving Coil Type

Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

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Page 1: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Electromagnetic Relays

• Attracted Armature Type

• Induction Disc Type

• Induction Cup Type

• Moving Coil Type

Page 2: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Hinged Attracted Armature Type relay

Page 3: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Shaded Pole Induction Disc Relay

•Robust & reliable Construction •Fluxes displaced in space & time •Eddy currents in disc•Disc rotation α driving toque•Brake magnet to avoid over run

• Used for over current protection• Used for slow speed relays• Reset/pick up ratio > 95%

Page 4: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Wattmetric type Induction Disc Relay

•Two electromagnets

• Upper and lower produce two different flux

• Energised by two different sources

•If energised by same source then R and X would be made different to get phased difference between fluxes

Page 5: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Induction Cup Relay

Page 6: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Induction Cup Relay

• Stationary core inside rotating cup

•Spindle carries arm - closes relay contacts

•Spring for resetting torque

•No brake magnet

•Principle of Induction motor

Page 7: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Induction Cup Relay

• Stationary core inside rotating cup

•Spindle carries arm - closes relay contacts

•Spring for resetting torque

•No brake magnet

•Principle of Induction motor

• Rotor is hollow cylinder (inverted cup)

•Two pairs of coils produce rotating field

•Cup has less inertia than disc

•Interaction of rotating flux with current

•Less magnetic leakage

•Torque per VA is 3 times than disc type

•Operating time 0.01 s

•High torque/inertia ratio

•Suitable for higher speeds of operation

•Used for distance & directional relays

Page 8: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Moving Coil Relay

Page 9: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Torque Production in Induction Relay

Page 10: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Torque Production in Induction Relay

Page 11: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 12: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 13: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 14: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 15: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 16: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 17: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 18: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 19: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 20: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 21: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 22: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 23: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 24: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 25: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay

Page 26: Electromagnetic Relays Attracted Armature Type Induction Disc Type Induction Cup Type Moving Coil Type

Force Produced in Induction Relay