structural:reformatting, linguistic:voice_change
Non-triplen odd harmonics

Certain distorted (non-sinusoidal) periodic signals only possess harmonics that are neither even nor triplen harmonics, for example the output voltage of a three-phase wye-connected AC voltage controller with phase angle control and a firing angle of α = 45 ∘ {\displaystyle \alpha =45^{\circ }} and with a purely resistive load connected to its output and fed with three-phase sinusoidal balanced voltages. Their order is given by: h = 1 2 (6 k + k − 3), k ∈ N (non-triplen odd harmonics) {\displaystyle h={\frac {1}{2}}(6\,k+^{k}-3),\quad k\in \mathbb {N} \quad {\text{(non-triplen odd harmonics)}}} for example, h = 1, 5, 7, 11, 13, 17, 19, 23, 25 {\displaystyle h=1,5,7,11,13,17,19,23,25}.