DEVELOPMENT OF DEVICE OF PROTECTION AGAINST ARC SHORT CIRCUITS

In 2000th years in the electrical engineer's practice has appeared a new kind of switching devices — devices of protection against arc short circuits. In the beginning in the USA, and then and in Russia has been received lot of patents for a new class of electroprotective devices — AFCI (Arc Fault Circuit Interrupter). The principle of action of new devices consists in monitoring of processes in a controllable chain, allocation of the signals testifying to fire in electroinstallation of an electric arc (parallel or seriel) and switching-off of a load in case of failure. In the given work is described the variant of the decision of a problem of recognition of occurrence of an arc in electroinstallation. On the basis of the general representation about switching processes is constructed the model and entered the key concept of non-stationary switching process and offered the way of allocation from total electric signals of electroinstallation — a current of load and voltage on load — signals, tipical for this process. Essential characteristics of process are intensity (average energy switñhes for an time interval) and constancy (a constancy of likelihood properties in time). Are allocated some kinds of processes of switching