Dr. M. A. Rahman2025-12-162025-12-16https://dspace.academy.edu.ly/handle/123456789/1845This research introduces a new dqWPT-based hybrid technique for the protection of power transformers to be integrated with the operation and control circuits without affecting their performance. The 𝑑𝑞 axis components and the WPT are combined to provide a new hybrid technique. It is defined as the dqWPT hybrid protection system for power transformers. This hybrid technique is tested by off-line simulation and verified experimentally for two laboratory power transformers. The tests show good results for all types of faults and inrushes including CT saturation, mismatches, external faults, and over-excitation, etc. The proposed hybrid technique yields smart discrimination between faults and inrush currents, including transient phenomena in power transformers.Detecting and identifying the disturbances in power transformers have always been challenging tasks for accurate and reliable protection of power transformers. Several approaches have been tested for designing protective devices such as DFT, ANN, fuzzy logic and wavelets etc. The modern power system is highly polluted with harmonics, and the transient disturbances usually are non-stationary and non-periodic. Thus, these techniques may not be adequate for protection of newer power transformers. Current research indicates that the wavelet packet transform (WPT) provides fast and accurate distinguishing criteria for this purpose, because WPT do not suffer from such problem. However,Differential protection of Power Transformers