Power Transmission
From Point A to Point B
by
Mechanical System
and
Electrical System
Point A and point B are connected by metallic SHAFT.
Pont A and point B are connected by electric LINE.
Shaft has Driver Pulley at A Driven Pulley at B.
Line has Sending Bus at A Receiving Bus at B.
Driver and Driven pulley rotates in Same Direction with Same RPM.
Sending and Receiving Bus have Same Phase Sequence and Same
Frequency.
Shaft gets mechanical twist due to power transfer.
Line gets electrical twist due to power transfer.
Driven pulley is always Backward with respect to Driver pulley.
Receiving Voltage is always Legging with respect to Sending Voltage.
Shaft Twist Angle between driver and driven pulley is Torsion Angle.
Angle between sending and receiving voltage is Power Angle
Power transfer and twist relation is as per Stress Strain
Diagram.
Power transfer and twist relation is as per Power Angle Diagram.
Shaft twist depends on power transfer
Power Angle is depends on power transfer
Twist Angle also depends on Length of Shaft.
Power Angle also depends on Length of Line.
Twist Angle also depends on Thickness of Shaft.
Power Angle also depends on Grade of Line. (66, 132, 220 or 400 KV)
Twist Angle also dependable on Material of Shaft. (Elastic
module)
Power Angle also depend on formation of line. (Characteristic
impedance)
Maximum safe power transfer up to Yield Point.
Maximum safe power transfer up to Steady State Stability Limit.
Shaft Fails while power transfer is higher. Points A & B are
isolated
Synchronism is lost while power transfer is higher. Points A & B are isolated