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Neutral Ineffectively Earthed Power Systems (NIEPS) is common in China to limit earth fault current and eliminate the need for an immediate shutdown. A new type of high-voltage generator which offers a direct connection to the power network without the need for a step-up transformer is called powerformer. The neutral of the most powerformers is unearthed which belongs to NIEPS. When a stator single...
Most small or medium waterpower generation stations are multi-generator-systems (MGS) with more than one generator directly connecting a bus. A novel selectivity protection for generator stator grounding faults in the MGS is proposed in the paper. The third harmonic currents of each phase are measured in generator neutral points and generator terminals respectively. The third harmonic leaking current...
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