Analysis of the possibility of switching the Ukrainian electricity network to a voltage of 20 Kv
Journal Title: Наукові праці Донецького Національного Технічного Університету серія: Електротехніка і Енергетика - Year 2018, Vol 1, Issue 1
Abstract
An analysis of existing electrical networks indicates the physical and moral depreciation of electrical equipment (the age of some equipment is 50-70 years). Due to the obsolete technical base of Ukrainian distribution electrical grids, a high loss of electricity has become commonplace. The quality of the transmission of electricity to the end user is also reflected in the low level of automation. The development of the country and its economy inevitably leads to an increase in the number of energyintensive equipment with a general increase in the number of consumers (and as a result the load on the electricity grid), which often reaches the technical limit of existing networks. The power shortage is decided locally. To provide power to new consumers (multistory, factory, etc.). From power plants (or substations) parallel new power lines are laid, new distribution substations are being built. NERC suggests that this problem be addressed globally, and proposes to consider the possibility of a phased transition to the use of a class of average voltage of 20 kV instead of the generally applied voltage of 6 (10) kV. This direction of development of distribution networks is considered perspective and necessary for our country. Using a nominal voltage of 20 kV is a new level in saving energy, which will increase the throughput, reduce losses, as well as increase the reliability and safety of the used power grids. If we analyze the use of the nominal voltage of 20 kV in power transmission systems, then based on the experience of countries in which this technology has already been introduced, it is possible to distinguish its main advantages over the classical systems for us with a nominal voltage of 6/10 kV: • Bandwidth. With equal initial technical conditions and environmental conditions (intersection of cable rods, ambient temperature, etc.), electrical networks with a rated voltage of 20 kV have an increased transmission capacity compared to a voltage of 6 (10) kV. • Reduced costs (technological) used for electricity transmission. • Reserve power for consumers. • Reducing the length of the networks, due to the use of 20 / 0.4 kV MFP. • Unloading of distribution devices of substations, elimination of power shortages. • Improving the quality of electricity supply. The primary tasks for implementing this target project are: • Development and approval at the legislative level of additional mechanisms for attracting investment in renovation and development of distribution electricity grids, including obtaining and returning under the state guarantees of preferential credit resources; • accelerated and effective application of stimulating regulation in the field of transmission of electricity by local (local) electricity grids; • development and approval of schemes of renovation and development of distribution electric networks with due consideration of new approaches to their construction; • ensuring timely adoption of promising solutions, manufacturing of high-tech electrical equipment and devices The use of voltage of 20 kV in electric networks of Ukraine will increase the efficiency of the entire system of electricity supply, which in turn will reduce the losses of transmission of electricity to consumers of different categories. Also, such a concept will increase the reliability of the energy supply system and increase the overall load on the electricity network of individual sites, especially for rural areas and enterprises located far from energy distribution sites. The transition from the voltage class 6 (10) kV to 20 kV will lead to improved voltage quality, which will significantly increase the energy independence of the country
Authors and Affiliations
G. SHEINA, S. SKRYPNYK
Keywords
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