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Performance of Third Harmonic Ground Fault Protection Schemes for Generator Stator Windings

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3 Author(s)
Schlake, R.L. ; Westinghouse Electric Corp. ; Buckley, G.W. ; McPherson, G.

The paper shows how the normally generated third-harmonic voltage can be used to protect the lower ten to twenty percent of generator stator windings against ground faults. A method of determining the applicability of the scheme to a given machine is described which takes into account the design of the generator and its externally connected apparatus. The effects of finite resistence ground faults are also investigated and other advantages of the scheme, such as protection of the neutral, are also highlighted.

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Power Apparatus and Systems, IEEE Transactions on  (Volume:PAS-100 ,  Issue: 7 )