Adaptive 100% Injection-Based Generator Stator Ground Fault Protection With Real-Time Fault Location Capability

The paper presents a novel adaptive stator ground fault protection scheme with fault location capability for high-impedance grounded synchronous generators. The protection scheme uses already available neutral grounding signals in the existing subharmonic injection protection to obtain a Kalman adap...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2018-10, Vol.33 (5), p.2364-2372
Main Authors: Safari-Shad, Nader, Franklin, Russ, Negahdari, Amir, Toliyat, Hamid A.
Format: Article
Language:English
Subjects:
100% subharmonic injection method
Adaptive filters
Circuit faults
Fault detection
Fault location
Generators
Insulation
Kalman adaptive filtering
Parameter estimation
Real time
Real-time systems
Repair & maintenance
stator ground fault location
Stator windings
Stators
Synchronous generator stator ground fault protection
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Summary:The paper presents a novel adaptive stator ground fault protection scheme with fault location capability for high-impedance grounded synchronous generators. The protection scheme uses already available neutral grounding signals in the existing subharmonic injection protection to obtain a Kalman adaptive filter (KAF) for real-time stator insulation parameter estimation. The KAF estimator yields a method of continuous tracking of stator insulation condition during healthy operations. This information is then used for real-time stator ground fault detection as well as fault location. The effectiveness of the proposed method is verified using extensive experiments performed on a lab-scale unit-connected generating station.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2018.2802423