Automation of simulation of multistep relay and switching circuits

A structural-topological model of relay and switching circuits is proposed. An algorithm for the simulation of actuation of a relay and switching circuit is described, which is based on the analysis of its topology and the rules governing the action of the relay on the contacts. A special graph algebra is introduced to facilitate the topological analysis of relay and switching circuits. The automatic construction of the diagram of state transitions for a relay and switching circuit by executing input signal scenarios is considered. The execution of scenarios is illustrated using the automatic elimination of asynchronous mode of power system operation.