Total demand distortion

Total demand distortion (TDD) is the per-phase harmonic current distortion against the full load demand of the electrical system.

TDD indicates the impact of harmonic distortion in the system. For example, if your system is showing high THD values but a low demand, the impact of harmonic distortion on your system might be insignificant. However at full load, the THD value for the current harmonics is equal to TDD, so this could negatively impact your system.

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