Answer / shamshad ansari

First stage fault  only alarm and second stage trip the generator.

Answer / shamshad

First stage only alarm and second stage trip the generator.

Answer / imrakesh

Hi friend i m glad dat u came up with a question like dat .
i appreciate ur indepth study of power system .
well basically the rotor system of altenators are unearthed
due to which the single gound fault at the rotor doesnt
actually disturbs the rotor as there is no fault current ,
however if a second gorund to earth faukt develops then the
short circuit between the windings results as the fault
current gets a path to flow . the former is called the 1st
stage fault while the latter is called the 2nd stage fault.

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