High harmonic content in a substation power supply significantly impacts transformer Dissolved Gas Analysis (DGA) results by increasing the rate of oil and paper insulation degradation, leading to the generation of specific gases. Harmonics are voltage or current waveforms with frequencies that are integer multiples of the fundamental frequency (e.g., 60 Hz). These non-sinusoidal waveforms cause increased eddy current and hysteresis losses in the transformer core and windings. These additional losses manifest as heat, accelerating the breakdown of the insulating materials. Specifically, harmonics lead to elevated leve....
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