Harmonics Control

Selecting Calculated from Power Flow causes the fundamental voltages and currents calculated in the Power Flow to be used for summation calculations. Selecting User Defined enables you to enter a per-unit fundamental voltage and causes the fundamental current to be determined by the Fundamental Amps setting in the Harmonics tab of the equipment dialog boxes.

This field specifies the frequency for Single Point Current Flow or All Source Current Flow calculations.

All solutions will use positive sequence unless Pos Seq with Zero seq triplens is selected, in which case the solution for the 3, 6, 9, and so on harmonics use the zero sequence/network.

Magnitude is defined in either amps or per-unit. The Angle of the current being injected may also be entered. For Network, you can select to have the network solved based on the positive sequence or the zero sequence.

For items using a pi-model impedance representation (cable, transmission lines, and transformers), the branch side currents may differ. Select either the From or To, indicating which branch side to use for determining item losses, K-factor and derating. Frequency scans are also affected by this choice, where the current value plotted for a branch is selected here.