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Nowadays voltage transients in electrical power systems can take different shapes related to properties of distortion source and physical phenomenon appearing in systems. Usually overvoltages contain oscillation components of different frequencies, which are propagating along lines reaching transformer terminals. Overvoltages impact power transformer insulation systems in spite of used overvoltage...
The application of transformers in offshore wind farms requires more consideration in the sense of reliability and protection than onshore ones due to the higher cost of accessibility and repair. Switching of offshore wind farms and lightning strikes are the main two transient phenomena which can lead to harmful damages to Wind Turbine Transformer (WTT) as well as other equipment. Thus, the frequency...
Power transformer insulation systems are subjected to many stresses during normal operation due to lightning and switching. If the spectrum of incoming surge voltage matches the winding one, the corresponding resonance will be excited. Therefore external transients occurring in power systems might trigger internal overvoltages with large maximum value in transformer windings. Overvoltages having such...
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