Abstract
In this study, the stator current characteristics of synchronous condensers for stator interturn short-circuit (SISC) fault in the early stage are investigated using theoretical derivation, finite-element analysis (FEA) and experimental research. In contrast to previous studies, this study considers the real operation characteristics of synchronous condensers that need to change the exciting current to meet the reactive power demand of the power grid. Thus, a new SISC fault indicator (FI) based on the stator current is proposed in this study. The new FI can identify incipient SISC and suppress the interference of the exciting current variation. A customized synchronous machine and TTS-300-2 synchronous condenser are simulated using FEA to demonstrate the effectiveness of the FI. Furthermore, experimental tests are conducted in a customized synchronous machine to prove the practical significance of the studies.
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