Harmonics Options

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.

Select Current Flow Report to generate a text report whenever a Single Point Current Flow or All Source Current Flow is performed. This report contains bus voltages and angles, as well as equipment currents and angles.

The Summation Detailed Report contains a list of each bus and its attached equipment items along with the output analysis related to each item.

When Summation is selected, the Summation Spectra Report contains a list of buses with per-unit voltages and branch items with per-unit currents. All harmonics present are listed, while insignificant amounts are represented with a zero value.

To obtain a report of all harmonic sources, select the arrow below Find in the Harmonics tab and select Query. Select Items (Motor, Load, Motor Control Center, Panel Schedule), select Output > Item Selection, then in the Advanced tab for Load Class, select Any and for Load Type, select Harmonic.

Select one or more of these reports, or select All Reports to have EasyPower create the complete report list.

The output can be displayed in either V(LL), kV(LL) or Per-unit.

Enabling this displays the units of the one-line results.

When this is enabled, the THD values are displayed in percent. Otherwise they are displayed in per-unit.

This sets the number of digits past the decimal point for values displayed on the one-line. This is applicable for all values except voltages.

This sets the number of digits past the decimal point for bus voltages displayed on the one-line.

Display branch flows which are "From" the bus, "To" the bus, or both "From" and "To" the bus.

The output can be displayed in either V(LL), kV(LL) or Per-unit.

Current can be displayed in Amps, Per-unit (system base), or Per-unit (equipment rating base).

Y-Axis Frequency Scan Units

Specify the unit for frequency scan Y-axis. The choices are kV(LL), Vpu, Ohms, Zpu, Rpu, Xpu, and Angle (Deg).

Specify the unit for frequency scan Y-axis for branches such as cables and transformers. The choices are Ipu and Amps.

Y-Axis Bar Charts Units

Specify the unit for Summation Bar Chart Y-axis. The choices are Vpu, V(LL) and kV(LL).

Specify the unit for frequency scan Y-axis for branches such as cables and transformers. The choices are Amps, Per-unit (system base) and Per-unit (Equipment rating base).

X-Axis

Set the x-axis units to either frequency in hertz or harmonic multiple.