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Harmonic currents are currents that flow in a system at frequencies that are multiples of the fundamental frequency (typically 50 Hz or 60 Hz). These currents can distort the voltage waveforms in an electrical system, leading to issues such as overheating of equipment, increased energy losses, and interference with communication systems. Mitigation strategies include using filters, harmonic-canceling Transformers, and active harmonic control devices.

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