This dialog box includes the following areas and tabs:
Figure 1: UPS Data Dialog Box
ID Name: Uniquely identifies the UPS. This ID name is sometimes referred to as the UPS name, and can be up to 12 characters long. The names default to UPS-1, UPS-2, UPS-3, and so on as you enter new UPS’s on the one-line diagram, but you can change those names later if needed.
Input Bus: The ID name of the bus connected to the input branch. The bus voltage determines the input voltage rating of the UPS.
Output Bus: The ID name of the bus connected to the output branch. The bus voltage determines the output voltage rating of the UPS.
UPS kVA: kVA rating of the UPS.
X/R: X/R ratio used for short circuit calculations at the output.
½ Cycle Short Circuit Capabilities: Momentary short circuit contribution. Value is entered as multiple of kVA rating. Example: A 500kVA/0.48kV UPS has a momentary short circuit contribution of 3000Amps. The short circuit capability in multiples of kVA rating is 4.988 (~5.0). [ multiple = sqrt(3)*3kA*0.48kV/500kVA.]
Interrupting Short Circuit Capabilities: Short circuit contribution at 5 cycles.
30 Cycle Short Circuit Capabilities: Short circuit contribution at 30 cycles.
Figure 2: UPS Data Power Flow tab
%Efficiency: Efficiency of UPS in delivering active power to load. When there is no battery charging, input active load is equal to output active load divided by efficiency.
% Battery Charging: Power consumed in charging battery, expressed as percentage of Rated kVA of UPS.
Input PF: Power factor of input.
Ctrl kV PU: The per unit output voltage of the UPS, which the UPS tries to maintain.
Ctrl Angle: The output voltage angle of the UPS, which the UPS tries to maintain.
Use the Harmonics tab to indicate whether this equipment item is introducing harmonics into your power system.
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 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 5th 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.
EasyPower offers two methods for calculating RH:
RH = RFund * H R-EXP
RH = RFund * (1+ECF*H2)/(1+ECF)
EasyPower defaults all skin effect correction to R-EXP and a value of 0.5.
| R-EXP | %ECF | |
|---|---|---|
|
Transformer |
0.5-1.0 |
1.0-3.0 |
|
Utility |
0.0-0.8 |
- |
|
Generator |
0.3-0.6 |
- |
|
Line/Cable |
0.5 |
- |
|
Reactor |
0.5-1.0 |
0.8-3.0 |
|
Motor |
0.2-0.4 |
- |
Use to set the fundamental amps. The options are as follows:
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.
This tab is read-only and appears only if you have imported data from an SKM Data Format file. See Importing an SKM Format File for more information.
See Comments for information.
See Hyperlinks for information.
| Database Technical Reference |