Безпечний пристрій сполучення з індукційним мажоритарним реле

Abstract

One of the tasks solved in the development of control systems is the interfacing of microelectronic equipment with actuators. Its complexity is largely determined by the requirements for the reliability of the designed systems, and in particular, functional safety. The most common method of significantly improving the reliability of automation systems is redundancy [1], therefore, control computing systems of critical control systems are designed to be multi-channel. In such systems, interface devices (ID) perform several functions: they implement the control logic adopted in this system, “reducing” the control signals from the outputs of individual redundancy channels to one; carry out direct switching of control circuits of objects. In railway automation systems, in addition, the ODR should with an acceptable probability eliminate the false activation of actuating objects in case of any failure of the elements of the interface device, as well as elements in the output circuits of the control channels [2]. Since the cost of control systems is proportional to the number of backup channels, the search for a compromise between the acceptable performance characteristics of the systems and their price has led to the fact that two-channel and three-channel structures operating according to scheme 2 of 2 and 2 of 3 are most widely used. It is this logic that the most common devices implement. However, the analysis of known circuit engineering, algorithmic solutions that provide both contactless and relay pairing of control computer complexes with objects suggests that they have a number of significant drawbacks, so the task of finding other solutions remains relevant [5]. This article proposes a design, substantiates the possibility and expediency of using three-element induction relays in the ID, functioning on the principle of a three-phase asynchronous motor and capable of implementing control logic 2 of 2, 2 of 3 with high functional safety indicators