ETAP Components- Power Grid Editor. Tutorial on the short circuit page.

ETAP Components- Power Grid Editor. Tutorial on the short circuit page.

If you are a distribution facility that distributes electricity to end-users, you most likely take power from the grid.

On the other hand, if you are a generating facility that produces electricity, you most likely feed the grid with the excess power you generate.

Most ETAP models will have at least one power grid component.

Power Grid Component

Figure 1 below displays the power grid component editor on ETAP

Callouts 1 through 9 on the left side represent all the pages in the component editor. Today, we will focus on callout 3: the short circuit page, a crucial aspect of power grid management.

As you navigate through the pages, the currently activated page is always shaded in blue for your convenience.

Today, we'll focus on the short circuit page, shaded in blue. The graphic on the right provides a clear view of the short circuit page of the power grid editor.

Short circuit rating page

The section is only enabled for 3-phase power grids.

Callout A: MVAsc

It is a radio button. If you click on it, you change the units of the data you entered below in MVA, KVA, or VA. I will leave it to MVAsc.

The letter sc next to MVA means short circuit. So MVAsc means MVA short circuit.

Callout B: 3-phase MVAsc

For 3-phase faults, you need to enter the MVA short circuit contribution from the grid. For this example, MVAsc is 71.072 MVA.

Callout C: 1 phase MVAsc

You need to enter the 1-phase MVAsc. It is calculated with the formula sqrt (3) * V line to line * I fault. ?In this example, we have 51.314 MVA

Callout D: 1 Phase MVAsc

This value is auto-populated when you enter a value in Callout C. Unlike Callout C, it uses V line neutral* I fault.

Callout E: X/R 3 phase

Enter X/R for positive sequence impedance

Callout F: X/R 1 phase

Enter X/R for zero sequence impedance

Callout G: 3 phase kAsc

Enter the 3-phase symmetrical short circuit current rating. This value gets auto-populated when you enter 3-phase MVAsc.

Callout H: 1 phase kAsc

Enter the 1-phase (line to ground) symmetrical short circuit current rating. This value gets auto-populated when you enter 1 phase MVAsc.

Rest assured, when you fill in the values we've discussed on the left side, all those SC impedances (100 MVab) get auto-populated on the right side in Figure 2. This reliable feature saves you time and ensures accurate data entry.

Fun stuff to know

When you right-click on the component editor, you can see a menu that shows the following:

• Size. The size of the component symbol can be changed. 1 is the smallest, and 5 is the largest. See Figure 3 below

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• Symbol. The symbol of the graphic can also be changed. See Figure 4 below

For this particular example, we run power flows and see the KW and Kvar. The KW and Kvar are independent of the short circuit values we entered. I want to show a view of the program with the utility component while running the power flow module.

 The end - La fin - El Fin ??        

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