Technical and economic analysis of parameters of urban distribution electric networks 10 kV

In the article, using the criterion analysis method, the analysis of the stability of total costs, the sensitivity of parameters to changes in the initial data (to the analysis of the influence of errors in the initial data) is carried out, and recommendations are given on the use of the obtained parameters for 10 kV distribution electrical networks.

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Technical and economic analysis of parameters of city distribution electric network up to 1000 V

E3S Web of Conferences ◽

10.1051/e3sconf/202128907016 ◽

2021 ◽

Vol 289 ◽

pp. 07016

Author(s):

M V Melikuziev ◽

L. A. Nematov ◽

A N Novikov ◽

K K Baymuratov

Keyword(s):

Economic Analysis ◽

Economic Indicators ◽

Electric Network ◽

Technical And Economic Analysis ◽

Mathematical Expressions ◽

Technical And Economic Indicators ◽

Criterion Analysis ◽

Network Processing

The article shows the sequence of development of mathematical expressions of the technical and economic indicators of networks whose voltage is up to 1000 V. In the development of these expressions, methods such as the smallest squares, the criterion analysis were used. From the resulting expressions, it is possible to see which sizes are significantly dependent or dependent on the costs incurred for this network processing.

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Estimating the Error of Calculating the Load Losses in 6—10 kV Distribution Electric Networks

Vestnik MEI ◽

10.24160/1993-6982-2021-5-37-43 ◽

2021 ◽

pp. 37-43

Author(s):

Aleksandr A. Varga ◽

◽

Galaktion V. Shvedov ◽

Keyword(s):

Computer Program ◽

Electrical Networks ◽

Power Losses ◽

Electric Networks ◽

Measurement Systems ◽

Loading Mode ◽

Load Factors ◽

Nonuniform Loading ◽

Modeling Calculation ◽

Urban Distribution

The aim of the study is to estimate the level of load losses for actual (nonuniform) loading of transformer substations in comparison with the load loss level under the conditions of their being uniformly loaded for a typical 6 kV urban distribution electric network. The extent to which such networks are equipped with automated information and measurement systems for fiscal electricity metering is extremely poor. Therefore, not only the load curves of the 6--10/0.4 kV substation transformers, but also their load factors are unknown in the majority of cases. Under these conditions, in calculating the load losses in 6--10 kV distribution electric networks, it is assumed that all substation transformers are uniformly (equally) loaded. The load losses in these electrical networks are calculated with a certain error associated with the assumption according to which the substation transformers are supposed to be uniformly loaded. Under these conditions, estimation of this error becomes of issue. The article describes the modeling, calculation and analysis of technical losses of electricity under the conditions of nonuniformly loaded transformers of a typical urban distribution network consisting of four transformers and four cables interconnecting them. The modeling and calculation of power losses were carried out using the RAP-10-st computer program for several different groups of transformer loading factors. Within each group, different subgroups were produced by rearranging the group loading factors. Each subgroup modeled a nonuniform transformers loading mode in the studied network. For each of these modes, the power losses were calculated and studied with the use of the RAP-10-st computer program. A conclusion has been drawn from the obtained analysis results regarding the error in determining the load losses associated with the assumption about the uniform loading of the substation transformers in the network. The obtained results may prompt electric grid companies to increase the extent of fitting their networks with automated information and measurement systems for fiscal electricity metering to improve the accuracy of determining the load losses.

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Configuration management of electricity distribution grids 6-35 kV according to the criteria of reliability

E3S Web of Conferences ◽

10.1051/e3sconf/20185802017 ◽

2018 ◽

Vol 58 ◽

pp. 02017

Author(s):

Vladimir Vukolov ◽

Boris Papkov ◽

Evgeny Pnev ◽

Anton Kolesnikov

Keyword(s):

Configuration Management ◽

Electricity Distribution ◽

Analysis Method ◽

Electrical Networks ◽

Electric Networks ◽

Hierarchy Analysis ◽

Definition Of ◽

Distribution Grids

Questions of a choice of criteria for definition of places of opening of electric networks 6-35 kV are considered in this paper. Recommendations are given on the configuration management of distribution electrical networks based on the hierarchy analysis method.

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Technical and Economic Analysis of Conversion Landing Craft Tank (LCT) into RO-RO Ferry for Route of Ketapang-Gilimanuk

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.874.189 ◽

2018 ◽

Vol 874 ◽

pp. 189-195

Author(s):

Febriani Rohmadhana ◽

Hesty Anita Kurniawati

Keyword(s):

Economic Analysis ◽

Technical Analysis ◽

Bending Stress ◽

Total Cost ◽

Technical And Economic Analysis ◽

Intact Stability ◽

Directorate General ◽

Longitudinal Bending ◽

Longitudinal Strength ◽

The Stability

Landing Craft Tank (LCT) is not allowed to operate as a ferry based on decree of Directorate General of Civil Ashore of No. SK 881/005/AP. DRJD/2015 that had been issued on 15 March 2015. This research is intended to analyze in technically and economically on the conversion of LCT Putri Sritanjung that has been operated as a ferry in Ketapang Port into RO-RO Ferry. The technical analysis is aimed to modifying this ship based on decree of Ministry of Transportation of no. 80 and no. 39, compliance of longitudinal strength, freeboard, tonnage, and stability. From this analysis, generate the longitudinal bending stress of 1, 248.957 kg/cm2, the minimum freeboard of 0557 metres with maximum draft of 2.19 metres, the tonnage of 551 GT, as well as the stability comply the criteria of Intact Stability (IS) Code in all loadcase. Meanwhile the economic analysis generate the total cost of conversion approximately 2,000,640,524 rupiahs.

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ESTIMATION OF TECHNICAL, SPECIALIZED AND ECONOMIC EFFICIENCY OF CULTIVATED POTATO VARIETIES USING DATA ENVELOPE ANALYSIS METHOD (DEA) IN IRAQ FOR SPRING LUG 2018

Anbar Journal of Agricultural Sciences ◽

10.32649/ajas/2020/11 ◽

2020 ◽

pp. 119-131

Keyword(s):

Technical Efficiency ◽

Economic Efficiency ◽

Potato Crop ◽

Economic Status ◽

Analysis Method ◽

Envelope Analysis ◽

Variable Capacity ◽

Data Envelope Analysis ◽

Using Data ◽

The Stability

Research highlights the importance of potato crop, which occupies a prominent food and economic status in food security besides rice, wheat and corn at the local and global level. Despite the expansion of the cultivation of potato crop in Iraq in general and Ameriyah district in particular However, potato productivity remains substandard, this may be due to a lack of knowledge of the most efficient varieties and not to use productive resources at the levels at which technical, specialized and economic efficiency is achieved. Therefore, the aim of the research is to determine the technical, specialized and economic efficiency according to the cultivated seed category. The data envelope analysis (DEA) method was used to estimate technical, specialized and economic efficiency, assuming constant and variable capacity returns. As a result of the study, the Safrana variety achieved the highest average technical efficiency according to the stability of the yield and capacity efficiency in addition to achieving the highest average specialized and economic efficiency, The Lapadia variety achieved the highest average technical efficiency, assuming that capacity returns have changed. Therefore, we recommend the adoption of items that achieve higher efficiency and the need to redistribute the elements of production better and Achieving the optimum levels at which technical, specialized and economic efficiency is achieved and saving what has been wasted.

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Symmetrizable Difference Dchemes

Computational Methods in Applied Mathematics ◽

10.2478/cmam-2005-0001 ◽

2005 ◽

Vol 5 (1) ◽

pp. 3-50 ◽

Cited By ~ 2

Author(s):

Alexei A. Gulin

Keyword(s):

Initial Data ◽

Difference Scheme ◽

Difference Schemes ◽

Time Dependent ◽

Stability Boundaries ◽

Typical Representative ◽

Variable Weight ◽

The Stability ◽

Conditions Of Stability ◽

The Right

AbstractA review of the stability theory of symmetrizable time-dependent difference schemes is represented. The notion of the operator-difference scheme is introduced and general ideas about stability in the sense of the initial data and in the sense of the right hand side are formulated. Further, the so-called symmetrizable difference schemes are considered in detail for which we manage to formulate the unimprovable necessary and su±cient conditions of stability in the sense of the initial data. The schemes with variable weight multipliers are a typical representative of symmetrizable difference schemes. For such schemes a numerical algorithm is proposed and realized for constructing stability boundaries.

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Study of the operation of an artificial neural network that works in the electric network in order to prevent emergency conditions.

Journal of Electrical and power engineering ◽

10.31474/2074-2630-2020-1-48-54 ◽

2020 ◽

Vol 14 (1) ◽

pp. 48-54

Author(s):

D. Ostrenko ◽

Keyword(s):

Neural Networks ◽

Learning Algorithm ◽

Electricity Consumption ◽

Electrical Energy ◽

Energy System ◽

Electrical Networks ◽

Electric Networks ◽

Electric Network ◽

Time Dynamics ◽

Emergency Situations

Emergency modes in electrical networks, arising for various reasons, lead to a break in the transmission of electrical energy on the way from the generating facility to the consumer. In most cases, such time breaks are unacceptable (the degree depends on the class of the consumer). Therefore, an effective solution is to both deal with the consequences, use emergency input of the reserve, and prevent these emergency situations by predicting events in the electric network. After analyzing the source [1], it was concluded that there are several methods for performing the forecast of emergency situations in electric networks. It can be: technical analysis, operational data processing (or online analytical processing), nonlinear regression methods. However, it is neural networks that have received the greatest application for solving these tasks. In this paper, we analyze existing neural networks used to predict processes in electrical systems, analyze the learning algorithm, and propose a new method for using neural networks to predict in electrical networks. Prognostication in electrical engineering plays a key role in shaping the balance of electricity in the grid, influencing the choice of mode parameters and estimated electrical loads. The balance of generation of electricity is the basis of technological stability of the energy system, its violation affects the quality of electricity (there are frequency and voltage jumps in the network), which reduces the efficiency of the equipment. Also, the correct forecast allows to ensure the optimal load distribution between the objects of the grid. According to the experience of [2], different methods are usually used for forecasting electricity consumption and building customer profiles, usually based on the analysis of the time dynamics of electricity consumption and its factors, the identification of statistical relationships between features and the construction of models.

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