Overcurrent Characteristics Grabber

The Overcurrent Characteristics Grabber tool is a supplement to the Overcurrent test module. It helps to extract inverse-time overcurrent relay tripping characteristics from graphical representations. This is most helpful in cases where the characteristic is not known by a given formula but only by a graphical representation, e.g. an image in a relay manual.

This tool loads a scanned image of the characteristics and guides the user through scaling of the I and t axes and successive digitizing of I/t data pairs along the displayed tripping characteristic curve. The resulting characteristics curve value table then is transferred to the Overcurrent test module for performing tests with automatic assessments.