Answer / sashi bhusan mahanta

Earth fault means phase short to ground,earth leakage means
a machine leakage some volt due to induction & eaddy
curent,or insulation is low class.

Answer / s.k. ghosh

Earth Fault means single line to ground fault or double
line to ground fault.Earth leakage means a equipent or
conducting matrial induce some voltage due to
electromagnetic induction.These type of equipment should be
grounded.

Answer / a.arun

how to calculate current carrying capacity for cables?

Answer / m bilal akram

a line touch with ground is called earth fault due to this
current flow back to sours.earth leakage equipment work on
kerchief current law incoming current is equal to outgoing
current.when not equal UN balancing current flow due to this
current flux generate in sensing coil(CT)and then tripping
occur with CT output.

Answer / namrata

the earth fault when there is no neutral grounding jn the
system.

what is the major difference between dc generator and synchronous generator?

4 Answers  

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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