You can adjust the relay settings while the overcurrent relay curves are being displayed. After each adjustment, the program will automatically re-compute the relay operating time and display the new curves.
In this example, we will adjust the setting of the fourth relay to increase the delay. Please make a mental note of the position of this relay curve.
1. Double click the left mouse button within the parameter caption of the fourth relay.
A dialog box with the parameters of this relay will appear, as shown below.
2. Use the <Tab> key to move the text cursor to the 'Time Dial' edit box and change the time dial setting from 0.5 to 1.4.
Press OK.
The dialog box will disappear and the relay curves will be redrawn to reflect the new setting. The new relay operating time will be shown in the parameter box.
Note that the fourth relay curve is shifted upward as a result of increasing the time dial setting.
Similar procedures can be used to adjust the pickup setting, the instantaneous setting, and other relay parameters. You can also change the relay curve if needed.