Analysis and Forecast E.M.Perminov, Cand. Sc. (Engineering), Chief Technology Officer of “Integral Electric Power Complex” Corporation, General Director of CJSC SPA “Alternative electric energy industry”, Vice-President of “International Energy Academy”
Place and role of renewable power generation and energy deliver in Russia
The global power situation is getting worse and will continue to be critical due to the growth of power consumption, limited energy resources and continuous increase of their cost, as well as severe environmental requirements. Though for the most part the Russian power engineering ensures provision of the national economy with electrical energy and heat, it becomes apparent that the Unified Energy System of Russia which is the main guarantor of the reliable power supply and energy safety of the country cannot ensure in full the energy safety and reliable power supply for the remote and hard-to-reach areas of Siberia, North and Far East that are not covered by the centralized power supply. Therefore it becomes vital that the science-based energy strategy should be developed for the decentralized and renewable energy sources of Russia.
Renewable power generation, Russian power engineering, unified electric power system, energy strategy, reserve of energy Science and Technology
G.V. Greshnyakov, Cand. Sc. (Engineering), Head of Laboratory of NII “Sevkabel”; S.D. Dubitsky, Director of OOO “Tor”; G.G. Kovalev, Cand. Sc. (Physics and Mathematics), Director of NII “Sevkabel”; N.V. Korovkin, Dr. Sc. (Engineering), Head of Department of Saint Petersburg State Polytechnical University
Numerical simulation of the electric field in the reinforcing insulation of cable accessories
Wide distribution of high voltage cable lines demands the development of competitive cable accessories, in particular joints and terminations. Cable accessories are advanced technology products which ensure electric field equalization at the spot of rupture of the cable semiconducting screens. There are several ways of field equalization based on the selection of the proper geometric configuration and physical properties of the joint stress-cone elements. The authors describe advanced methods of field equalization and offer a procedure combining the advantages of the geometrical and refraction methods. A numerical analysis of field distribution was made which served the basis for the offered configuration of active elements and optimal properties of the stress-cone materials.
Electric field, simulation, isolation, cable accessories, refraction methods, geometrical method
G.V. Greshnyakov, Cand. Sc. (Engineering), Head of Laboratory of NII “Sevkabel”; S.D. Dubitsky, Director of OOO “Tor”; G.G. Kovalev, Cand. Sc. (Physics and Mathematics), Director of NII “Sevkabel”; N.V. Korovkin, Dr. Sc. (Engineering), Head of Department of Saint Petersburg State Polytechnical University Electromagnetic and thermal analysis of the cable system current load using the finite element method
The paper deals with the procedure of joint calculation of the electromagnetic and thermal field of a three-phase cable line consisting of three single-phase cables with XLPE insulation. An underground installation is considered where the cables are laid in a line and in a triangle pattern, with a grounded and an ungrounded screen, with various characteristics of the soil. Separate consideration is given to the situation occurring in the design practice when one of the three line phases is at a considerable distance from the two others. The finite element method is used to calculate the temperature field and to analyze the quasi-stationary electromagnetic field for the purpose of determining the heat sources in the current-carrying conductor, screen, armour and high voltage cable insulation. The field approach to the determination of losses enables taking proper account of the current displacement effect, the proximity effect due to the mutual interference of cables, the actual distribution of induced current density in the armour and screen with different ways of the screen grounding. The Russian ELCUT package was used in field calculation.
Electromagnetic analyzation, thermal aanalyzation, current load, finite element method
V.N. Korshunov, Dr. Sc. (Engineering), Professor, the Multichannel Telecommunication Systems Department of Moscow Technical University of Communication and Information Technology
Determination of cable circuit performance parameters by loop line measurements
A method of determining the operating transmission parameters of symmetrical communication cable circuits by loop line measurement is suggested. Numerical values and recommendations concerning practical use of the method are given.
Loop line measurement, cable circuit, parameters of symmetrical