We propose an exact synthesis method which allows the design of dual-band transformers with an arbitrary even number of uniform sections giving equi-ripple impedance matching in two separate bands centered at two arbitrary frequencies. This method is a generalization of the exact Collin-Riblet synthesis of Chebyshev single-band transformers. As compared to a single-band Collin-Riblet transforme...

A transformer is an important part of the power system. Existing fault diagnosis methods are still limited by accuracy and efficiency solution excessively rely on manpower. In this paper, a novel neural network designed to overcome issue. Based traditional method judging ratio dissolved gas in internal insulation oil, fast model was built with improved probabilistic (PNN). The particle swarm op...

The insufficient amount of sample data and the uneven distribution collected across faults are key factors limiting application machine learning in power transformer fault warning, as demonstrated by poor adaptability established data-driven models under actual operating conditions. In this paper, an unsupervised supervised method is designed for early warning based on electrical quantities vib...

Preventive maintenance in the transformer is performed through a differential relay protection system, and it protects from internal external faults. However, Current Transformer (CT) system mal-operates during inrush currents. CT saturates due to magnetizing currents causes false tripping of relays. Moreover, identification either current or faults needs be diagnosed. For above problem, contin...