one thing i had done with the same problem last year that joint the two bus bar segment with flexiable bar but the section was of ngr,in case of outgoing which carry havey current, any patch give you local heating
dear devid as u say that the rotor earth fault takes place through the shaft of rotor,that means shaft of rotor is grounded...one more thing i wanna know that if only one winding is grounded through the shaft that is the typical case of 1st stage earth fault nd if two or more are grounded than...
i wanna know that in rotor earth fault the turns of rotor are lincked with ground or stator....interturn fault may happen but how it connected to ground