Testing Ground Fault Protection of Generating Units With Frequency-Selective Grounding

This paper experimentally evaluates responses of ground fault protection for synchronous generators, which are grounded using frequency-selective grounding. Frequency-selective grounding is designed to provide a low ground impedance path (similar to solid grounding) for high frequency zero-sequence...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2023-03, Vol.59 (2), p.1-13
Main Authors: Saleh, S. A., Ahshan, R., Valdes, M. E., Jewett, D., Mardegan, C., Meng, J., Panetta, S. A. R.
Format: Article
Language:English
Subjects:
and ground fault protection of synchronous generators
Frequency-selective grounding
Grounding
Harmonic analysis
Impedance
power system faults
Power system harmonics
Resistance
Stator windings
Synchronous machines
Voltage measurement
Zero sequence current
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Summary:This paper experimentally evaluates responses of ground fault protection for synchronous generators, which are grounded using frequency-selective grounding. Frequency-selective grounding is designed to provide a low ground impedance path (similar to solid grounding) for high frequency zero-sequence current components. This grounding system also provides an impedance similar to a low-resistance grounding for low frequency zero-sequence current components. The frequency-dependent equivalent impedance of frequency-selective grounding can affect ground potential and current, which are typically used as inputs for ground fault protective relays. Effects of frequency-selective grounding on ground fault protection are experimentally evaluated using a 7.5 kVA synchronous generator. Experimental tests are conducted for different implementations of ground fault protection, when responding to fault and non-fault events. Evaluation results detailed in this paper demonstrate the negligible effects of frequency-selective grounding on responses of different ground fault protective relays.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2022.3233558