Abstract:
Phasor-based differential protection is commonly utilized as the primary method for protecting power transformers due to its reliability and ability to distinguish between internal faults, external faults, and inrush currents. Nevertheless, these methods can experience delays caused by phasor convergence during fault conditions. They may fail in difficult scenarios, such as transformer energizations with low second-harmonic content and internal faults between turns or to earth.
The presentation aims to extend a previously published work where Clarke and wavelet transforms are used for a power-transformer time-domain differential protection approach.
The validation in a real-time RTDS platform demonstrates that the proposed method is efficient, extremely fast, straightforward, and unaffected by the harmonic content of the differential current.
Marjan Popov, TU Delft