Starting with version 11, OneLiner users have the ability to simulate logic schemes. The central part of each logic scheme is the user-defined trip logic equation that describes how various relay elements in the scheme interact to produce a trip. User can select the equation template from a list of standard logic schemes or enter a custom logic from scratch. The program evaluates the logic equation following each fault simulation and displays the scheme operation on the one-line diagram and in a modeless protection-scheme window.