The paper studies main technical requirements for digital substation bay controllers; substantiates the high reliability requirements for file systems running on Flash drives of such devices. An experimental test analysis of the most popular file systems for microcontrollers with limited resources with start-up systems on the STM32F407IGT6 controller have been made. The algorithm of Flash translation layer (FTL) is offered, and also its check on simulation model of the Flash drive and the experimental equipment is carried out. The results of comparing the characteristics of file systems and FTL algorithm are presented.
The paper discusses the results of experimental studies of pulsed generators based on a drift diode with a sharp recovery (DSRD) and inductive energy storage of standard and polygonal structures. For the first time the generator of a polygonal design is presented. It is shown that when the generators are working on an active-capacitive load, the rate of voltage rise on it at the generator of a standard construction is lower. The generator of a polygonal design has high characteristics for the rate of increase of voltage and its amplitude. This article will discuss the effect of capacitive load on the rate of voltage rise and the way to increase it.
The article presents the principle of thermal protection of the contact overheadlineand substantiates the possibility of practical implementation of this principle for rail electric transport in the mining industry. The algorithm for the implementation of modern digital protection of the contact overhead line as one of the functions of the controller is described. A mathematical model of thermal protection is proposed, which follows from the solution of the heat balance equation. The model takes into account the coefficient of the electrical networktopology, as well as the coefficient of consumption of the current-carrying core of the cable, which determines the reduction in the conducting section from contact erosion and the growth of oxide films. Corrections for air flows are introduced when receiving data from an external anemometer, via telemechanics protocol. The mathematical model was tested by writing a real thermal protection program in the C programming language for the bay controller, based on the circuitry of which is the STM32F407IGT6 microcontroller for the microcontroller unit. Verification tests were carried out on a serial bay controller in 2020. The graphs for comparing the calculated and actual values of temperatures, with different flow rates of the current-carrying conductor of the DC cable, are given. To obtain data, telemechanics protocols IEC 60870-104 and Modbus TCP, PLC Segnetics SMH4 were used.
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