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Answer Posted / kedar bhavsar
#1 ELCB
#2 UB RELAY
#3 OVER VOLTAGE PROTECTION
#4 UNDER VOLTAGE PROTECTION
#5 PHASE SEQUENCE
#6 EARTH FAULT PROTECTION
#7 REVERSE POWER PROTECTION
#8 OVER CURRENT RELAY
#9 SHUNT RELAY ETC.
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I have a drawing of a wound rotor induction motor for a crane. This crane motor has 5 forward speeds & 5 reverse speed implemented of course with different amount of resistance for each speed setting selected. What has got me scratching around is the fact that 8 of the 10 speed selections switch in uneven (unbalanced) amounts of resistances on each of the 3 connections to the motor's rotor.Can this be possible? I would have assumed this would produce unbalanced rotor currents and therefore vibration in the motor. I would greatly appreciate anyone's comments on this. Many thanks, Confused.
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