In this paper, we consider the sources of discrete signals, which are signals of the “dry contact” type. Their input is carried out in two main ways: simple contacts; flip contacts according to a 3-wire connection scheme, while normally open contacts are connected to odd inputs, normally closed contacts are connected to even inputs of the module. A potential 0–24 V signal from an information source having a common “ground” with the signal reception module and located in the same room as the discrete signal reception module can also be used as a source of discrete signals.
The basic principles of lightning protection on gas extraction installations of mines are considered. It is shown that, unlike general industrial facilities for underground workings, there is a danger of open sparking when the potential is removed from the lightning conductor grounding. Therefore, design solutions should be based on a common grounding device with equalization of the potentials of all metal elements of the installation.
In this paper, automation of the general plant equipment of nuclear power plants is considered. Automation of plant-wide NPP equipment is implemented using software and hardware complexes based on microprocessor technology. Typical solutions are being developed both in terms of hardware implementation of tasks and in software and algorithmic and largely correspond to typical solutions of the power unit. In terms of software and algorithmic implementation of control and management tasks, standard technical solutions have been developed for information input and processing algorithms, control algorithms for actuators, protections, locks, step-by-step logical programs, alarms, and automatic regulation.
The stages of mastering the technology of power semiconductor technologies (SPP) in VEI and domestic plants in previous years are described. The technical and organizational prerequisites for a comprehensive solution of the main problem of the SPP for the needs of energy, transport and special equipment are shown.
The normal functioning of electric power systems cannot be carried out without reliable and high-quality operation of distribution electric networks, which are the last link to provide consumers with electric energy. The article presents a method for calculating the stress asymmetry coefficient of the zero sequence in the Mahtcad mathematical package. Graphical results of damage caused by distortion of voltage symmetry are presented. An assessment of the consequences of stress asymmetry in the zero sequence is given.
