Suchergebnisse

The determining value of the Kola NPP in the structure of the Kola electric power system is shown. The mutually complementary operation of the 1,760 MW KAES with seventeen hydroelectric power stations with a capacity of about 1,600 MW and two 240 MW thermal power plants makes the region's power supply system unique, producing the cheapest electricity in the North-West of Russia. The issues related to the further extension of the operating life of the existing nuclear power plant and the construction of theKola NPP-2 in the future are considered.

The systematization and analysis of the results of monitoring registrations of electric power quality indicators (PQS) on substation buses feeding large industrial enterprises of the Murmansk region was carried out. The example of existing substations shows the problems of high-energy facilities that have consumers with non-linear parameters. The problems of electromagnetic compatibility of industrial consumers with the mains have been identified. The need for research to identify the causes of non-compliance is proved. A number of the most common and effective measures to limit the distortion of the SCE are proposed.

The article describes the operation principles of the "Blitzortung" —non-commercial low-cost lightning location network. At the beginning of 2019 five detectors of this network were installed on the Kola Peninsula and operated without interruption during 2019–2020 thunderstorm seasons. Analysis of lightning activity in the Murmansk region for this period are carried out, data on the impact of lightning on the elements of the Kolapower system are provided.

Damage from a lightning strike is the cause of 25% of accidents and breakdowns of wind turbines. To reduce wind turbine damage from lightning and to ensure overall safety around wind turbines, it is important to improve the performance of wind turbines associated with lightning protection and minimize the likelihood of damage to them. The experience of developing countries, actively replenishing the base of windturbines, has led to progress in technologies for the application of countermeasures in the field of wind energy. This article presents the latest trends in technology for reliable operation of wind turbines in thunderstorms.

The earth-termination system for towers of ground-based wind turbines in addition to protective and functional grounding provides lightning protection grounding, which is especially important since the wind turbine is susceptible to lightning strikes. If insufficient protective measures are taken, the risk of damage to a wind turbine due to a lightning strike increases. Therefore, a well-thought-out built-in grounding system for wind turbine towers is needed, which would function as necessary and guarantee long-term mechanical strength and corrosion resistance. The configuration of grounding systems for wind turbines is discussed in IEC 61400-24, which deals with the topic of lightning protection for wind turbines, including detailed information on the choice of lightning protection measures and surge protection. It is advisable to create a lightning protection concept at the initial stage of planning a wind turbine in order to avoid later costly repairs and retrofitting.

The article tells the story of the creation of the Nizhne-Tulomskaya hydroelectric power station (HPP). The main energy parameters of the hydroelectric power station, the layoutof the main structures of the station, and archival photos of the construction time are given. Data on the production and consumption of electricity for own needs, the cost of 1 kW·h during the great Patriotic war are shown. It is told about the reconstruction and current state of the station.

The analysis of technological violations in the 35 kV network in one of the Kolenergo subdivisions of Public joint-stock company "IDGC of the North-West", namely the Northern Electric Networks, was performed. The violations were systematized. The analysisconcluded that the greatest number of violations occurs on overhead power lines.

The article describes the main characteristics of surge arresters (SA) and notes that only twoof them are key when choosing an SA. The influence of structural and operationalfactors on the operation of SA and methods of their elimination are considered.

In this article the parameters of the input filter of a voltage-mode step-up converter are calculated.

The location territorial features of the Murmansk region electric power system determine its susceptibility to geomagnetically induced currents flowing through the dead-grounded neutrals of the transformers (autotransformers) during geomagnetic storms. The current values can sometimes reach tens of amperes and lead to half-period saturation of the steel core, and as a result to loss of reactive power, the appearance of harmonics, vibrations and windings overheating. All this can cause an emergency shutdown of lines or failure of the equipment itself. The article considers the analysis of the transformers and autotransformers technical condition of substations of voltage classes 110–330 kV on the Kola Peninsula. Statistics on the core types of the devicesare provided. Existing methods to reduce the effect of geomagnetically induced currents on transformers, as well as their advantages and disadvantages, are discussed.

The article presents the results of assessing the possibility of using simulation modeling to predict the ferroresonant process in electrical networks. A mathematical model of a three-phase power transformer in the form of a system of differential equations is considered. The MatLab software package was chosen as the modeling environment. In the conclusion of the work, the results of simulation were analyzed and the correspondingconclusions were drawn.

Electric pulse destruction of certain types of mineral raw materials has a number of advantages over mechanical methods of destruction, for example, selectivity of destruction without damaging the crystal structures of the destroyed raw materials; lower energy intensity of the processes of destruction of hard rocks: no additional contamination of materials when crushing especially hard and abrasive materials. Comparative analysis of the results of destruction of various types of rocks allows us to conclude about the advantages or disadvantages of electric pulse destruction of certain rocks.