The Overcurrent Curves Window (“OC Curves Window” or “Curves Window” hereafter) displays the time-versus-current or time-versus-MVA characteristics of overcurrent relays, fuses and reclosers. You can open this window through:
1. Relay | View Relay Curves and Logic Scheme command from the Main Window, or
2. Show Curve button in the relay-group dialog box.
You can have up to 20 relay, fuse and recloser curves on the same plot. You can also have up to 6 transformer damage curves, conductor annealing curves and other damage curves.
You can access the parameters of any protective equipment or damage curve by double-clicking on its caption. You can alternatively access the parameters by double-clicking on the curve itself. OneLiner redraws the curves immediately after you change the parameters.
The OC Curves Windows offers a wide variety of grid styles, colors and time units. The relay curves can be shifted to account for the difference in nominal kV between the location of the relay and the location of the fault.
You can move the captions for protective equipment and damage curves by dragging with either mouse button. The fault description is also movable.
You can store the curves being displayed in the OC Curves Window to a ‘curve collection’ in a PCC file. When you recall the curve collection later with the Relay | Open Curve Collection command in Main Window, or with the Misc | View Curve Collection command in the OC Curves Window, the relay curves, damage curves, relay descriptions, annotations, pictures, the legend, shapes and the time-difference sliders will reappear in the exact same arrangement on the window.
The cursor coordinates are shown next to the mouse cursor when you drag with either mouse button. When dragging with the left mouse button while depressing the Control <Ctrl> key, an L-shaped symbol spanning the initial mouse position and the current mouse position will appear on the screen. In addition, the current cursor coordinates and the extent of the L-shaped symbol are shown next to the mouse cursor.
Clicking the right mouse on the OC Curves Windows will bring up a floating menu of commonly-used commands. The list of commands within the floating menu varies depending on the item you clicked on.
You can edit the legend at the bottom of the graph by double-clicking on it. You can also add text annotations and graphics anywhere on the graph.
You can work on the OC Curves Window and the Main Window at the same time. If you have a large monitor, you can arrange the windows side by side and execute commands in both windows. When you display a fault in one of the windows, the same fault is displayed on the other window. If your monitor is not large enough to see both windows at the same time, you can minimize the OC Curves Window while you view the one-line diagram. To restore the OC Curves window, simply double-click on the window icon at the bottom of the screen.
You can paste up to 16 pictures onto the OC Curves Window. The pictures are moveable, and the picture background can be opaque or transparent.
The commands in the OC Curves Window are described in this section.
Curves Window