Performing Selective Coordination

This section teaches you how to perform selective coordination.

Start in the SELECTIVE COORDINATION drafting view.

Set Breaker Curves for Transformer T1 and Panel L

1.Run the Panel Edit command. If prompted to select a distribution equipment to edit, press ESC. The Panel Edit dialog box will open.

DM Electrical-> dmert-panel-16 Panel Edit

2.Select transformer T1 from the list.
3.Beside OCP Trip, press the Select Breaker Curve button. The OCP Device Settings dialog box will open.
4.Make the following changes:
a.Set Manufacturer to GE.
b.Set Group to Insulated Case Circuit Breaker > Type SH > MicroVersaTrip PM > 800A Frame.
5.Press the OK button to close the dialog box.
6.Select panel L from the list and, beside OCP Trip, press the Select Breaker Curve button. The OCP Device Settings dialog box will open.
7.Make the following changes:
a.Set Manufacturer to Square D.
b.Set Group to Low Voltage Power Circuit Breakers > MasterPact NW > MicroLogic 2.0.
8.Press the OK button to close the dialog box.
9.Press the Exit button to close the dialog box.

Create the Selective Coordination Graph

1.Run the Graph Insert command. The Insert Selective Coordination Graph dialog box will open.

DM Electrical-> dmert-blue-i-16 Graph Insert

2.Press the Add Distribution Equipment Curve button. The Select Distribution Equipment dialog box will open.
3.Select transformer T1 from the list and press the OK button to close the dialog box.
4.Repeat steps 2-3 for panel L.
5.Press the OK button to close the dialog box.
6.Follow the prompts to insert the graph on the drafting view.

breaker-curves-before

Modify the Breaker Curve

1.Run the Curve Edit command.

DM Electrical-> dmert-blue-c-16 Curve Edit

2.On the graph, select the curve or label for transformer T1.The OCP Device Settings dialog box will open.
3.Make the following changes:
a.Set Short-time Pickup to 2.
b.Set I² T to Out.
c.Set Instantaneous Pickup to 2.
4.Press the OK button to close the dialog box.

The graph will update to reflect the changes.

breaker-curves-after


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