Example 2: DC Link Inverter with a Battery Bank (UPS)

In this example, we have created a DC link inverter with a battery bank, also known as a UPS.

To view the sample and perform each analysis, open the example file DC Link Inverter with Battery Bank.dez located in your Samples directory.

The sample one-line DC Link Inverter with Battery Bank (UPS) is shown.

Figure 1: Sample DC Link Inverter with Battery Bank (UPS)

Perform the following tasks:

  1. Select Short Circuit to open the short circuit focus.
  2. Click Momentary.
  3. Double-click on the DC BUS to perform fault calculations on this bus. Note the fault current contributions from the rectifier and the battery.

    4. The DC fault results for a single bus are shown.

  4. While still in the short circuit focus, click Fault Bus(es) to fault all the buses.

    5. The DC fault results for multiple buses are shown.

  5. Click SC Options, and then select the Arc Flash Hazard tab. Note the options circled below.

    6. The Arc Flash Hazard tab of the Short Circuit Options is shown. Worst-Case Arc Flash Hazards Output is set to Including Main, Max Times is set to 2 seconds for each voltage level, and the Arc Flash Spreadsheet checkbox is selected.

  6. Close the Short Circuit Options dialog box, and then click Arc Flash to view the arc flash hazard analysis results.

    7. The arc flash results on the one-line are shown.

  7. Press F8 to arrange the windows for arc flash.

    8. The Arc Flash Hazard Report is shown.

    Figure 2: Arc Flash Hazard Report for DC Link Inverter Example

  8. In the one-line, double-click the Bypass ATS symbol. The connection switches over to the bypass mode. This is typical during a short circuit. The arc flash hazard results change at the AC OUTPUT bus.

    9. The arc flash hazard results for the fault current supplied by the bypass switch are shown.

Next: Example 3: Photovoltaic System

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