Load Data

Uniquely identifies the equipment item. The program automatically assigns a name, but you can change it, if needed. The name can be up to 16 characters long.

For loads, the program automatically assigns the names L-1, L-2, L-3, and so on.

This is the ID name of the bus to which the equipment is connected. The base kV of the bus is indicated on the right.

Specified: Designates the Load Data field to a user-entered model. You can enter any combination of constant kVA, constant I, or constant Z load.

SCADA: Designates the Load Data field to an imported real-time SCADA model. Data can also be user input in the SCADA fields just like Specified data.

Select the power type for the equipment. The options are:

• NPS: Normal Power Supply. For example, a power supply that has no backup.
• CPS: Critical Power Supply. For example, a power supply that includes an uninterrupted power supply backup.
• EPS: Emergency Power Supply. For example, a power supply that uses a generator for backup.

Load Data

Any combination of constant kVA, constant current, or constant impedance loads may be modeled. Different types of loads can also be mixed and matched to model a specific type of equipment such as variable speed drives.

Select the power type for the equipment. The options are:

• NPS: Normal Power Supply. For example, a power supply that has no backup.
• CPS: Critical Power Supply. For example, a power supply that includes an uninterrupted power supply backup.
• EPS: Emergency Power Supply. For example, a power supply that uses a generator for backup.

The default is Linear, indicating the equipment does not produce harmonics. Choosing Harmonic makes the item an harmonic source and makes other fields in this tab available to edit.

Note: For an adjustable frequency drive (AFD), the Load Type is always Harmonic.
For motors, the Load Type is Harmonic if the With Adjustable Frequency Drive (AFD) check box is selected on the Specifications tab of the motor; otherwise, it is always Linear.

Use to set the fundamental amps. The options are as follows:

• Equipment Rating sets Fundm Amps to the equipment rating of the item described in the Specifications tab. 
• User Specified activates the Fundm Amps field, enabling you to specify a value. 

To use fundamental current calculated by power flow, select Calculated from Power Flow in the Summation Fundamental Voltage area of the Harmonics Options > Control dialog box.

Use the spreadsheet to enter the harmonic spectrum produced by this item. You can enter up to 30 different harmonics in each equipment item. In the spreadsheet, enter the Harmonic Number (such as 5 for the 5^th harmonic), the Harmonic Current in percent of the Fundamental Amps, and the Current Angle. By indicating the current angle, you can simulate transformer phase shift effects on rectifiers so appropriate canceling can take place. The harmonic may be integer or non-integer.

Common harmonic spectra may be entered from the device library. For instructions on how to enter your own spectra information, see Harmonics with Spectrum™. After selecting a particular device library spectrum from the Mfr and Type lists, click Import, and that spectrum is entered into the harmonic spreadsheet.