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In this paper, a novel excitation-system ground-fault location method is described and tested in a 106 MVA synchronous machine. In this unit, numerous rotor ground-fault trips took place always about an hour after the synchronization to the network. However, when the field winding insulation was checked after the trips, there was no failure. The data indicated that the faults in the rotor were caused...
This paper discusses the application of three different 100% stator ground fault protection schemes. Two third-harmonic methods and a low frequency-injection method are discussed. Third-harmonic schemes have been widely applied on generators within the U.S. to provide stator ground fault protection over the entire stator winding. This paper discusses situations in which third-harmonic schemes will...
There are occasions in setting generator protection relays where the effective application of a protection function requires detailed measurement and analysis of operational data from the machine. This paper identifies two such functions: split phase protection and 3rd harmonic neutral under-voltage protection and discusses the particular application issues associated with each. A new algorithm is...
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