Determination of Error of Loss Calculations In Double Wound Transformers Using L-Shaped Substitution Scheme By Conditional Method Constant Coefficients

2021 ◽  
Vol 64 (1) ◽  
pp. 101-107
Author(s):  
Vladimir Bezyazychny ◽  
◽  
Sergey Kostinsky ◽  
Anatoly Troitsky ◽  
◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
High Voltage ◽  
Total Power ◽  
Electrical Networks ◽  
Power Losses ◽  
Accurate Calculation ◽  
Electric Networks ◽  
Research Results ◽  
Constant Coefficients

When calculating the modes of electric networks, an L-shaped circuit is used to replace one phase of the transformer with bringing its parameters to high voltage (HV), neglecting losses in the HV winding. More precisely, they can be taken into account using a T-shaped substitution scheme. In order to determine the error of the use of the L-shaped scheme in comparison with the use of the T-shaped scheme, the method of conditionally constant coefficients (CPC) was used, which was adapted to calculations using the L-shaped substitution scheme. By the method of the CPC, studies of the modes of the module "double-winding transformer - load (DTN)" were carried out in order to determine the error in calculating the total power losses of the transformer when using the L-shaped equivalent circuit in comparison with the T-shaped one. It was shown that the error in calculating losses for a 25 kVA transformer was 2%. The research results presented in this article are recom-mended to be applied in existing electrical networks for a more accurate calculation of modes and losses in transformers when using the L-shaped equivalent circuit

scholarly journals PARAMETRIC OPTIMIZATION OF OPERATING MODES OF BULK ELECTRICAL NETWORKS BY CRITERIA ACTIVE POWER LOSSES

2021 ◽  
Vol 2021 (59) ◽  
pp. 72-80
Author(s):  
V.V. Kuchanskyy ◽  
◽  
D.O. Malakhatka ◽  
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Transmission Lines ◽  
Reactive Power ◽  
Total Power ◽  
Electrical Networks ◽  
Power Losses ◽  
Operating Modes ◽  
Active Power Losses ◽  
Shunt Reactors

It is shown that the use of controlled shunt reactors enables, based on ultra-high voltage transmission lines, to create a controlled generation of new generation FACTS types that meet the requirements of modern power systems and combinations. Typical modes of operation of the high-voltage power line with installed controlled shunt reactors are analyzed. The efficiency of the use of controlled shunt reactors as measures of transverse compensation in ultrahigh voltage transmission lines is shown. The article shows that due to a smooth change in the consumption of excess reactive power of the transmission line, the normalization of the voltage values is achieved, and, accordingly, the total power losses are reduced. Ref. 9, fig. 3, tables 3.

scholarly journals Calculations, norming and reducing of electrical energy losses in city electrical networks

2019 ◽  
Vol 21 (3) ◽  
pp. 46-54
Author(s):  
A. V. Lykin ◽  
E. A. Utkin
Keyword(s):  
High Voltage ◽  
Power Transmission ◽  
Low Voltage ◽  
Demand Curve ◽  
Electrical Energy ◽  
Electrical Network ◽  
Energy Losses ◽  
Capital Investments ◽  
Electrical Networks

The article considers the feasibility of changing the structure of a distribution electrical network by transferring points of electricity transformation as close to consumers as possible. This approach is based on installation of pole-mounted transformer substations (PMTS) near consumer groups and changes the topology of the electrical network. At the same time, for groups of consumers, the configuration of sections of the low-voltage network, including service drops, changes. The efficiency of approaching transformer substations to consumers was estimated by the reduction in electrical energy losses due to the expansion of the high-voltage network. The calculation of electrical losses was carried out according to twenty-four hour consumer demand curve. To estimate the power losses in each section of the electrical network of high and low voltage, the calculated expressions were obtained. For the considered example, the electrical energy losses in the whole network with a modified topology is reduced by about two times, while in a high-voltage network with the same transmitted power, the losses are reduced to a practically insignificant level, and in installed PMTS transformers they increase mainly due to the rise in total idle losses. The payback period of additional capital investments in option with modified topology will be significantly greater if payback is assessed only by saving losses cost. Consequently, the determination of the feasibility of applying this approach should be carried out taking into account such factors as increasing the reliability of electricity supply, improving the quality of electricity, and increasing the power transmission capacity of the main part of electrical network.

scholarly journals Finding of the rational approach at the decision of a compensation in high-voltage networks

2009 ◽  
Vol 25 (25) ◽  
pp. 65-68
Author(s):  
G. Georgiev ◽  
I. Zicmane ◽  
E. Antonov
Keyword(s):  
Computational Model ◽  
High Voltage ◽  
Electrical Power ◽  
Rational Approach ◽  
Electrical Networks ◽  
Power Losses ◽  
Permissible Range

Finding of the rational approach at the decision of a compensation in high-voltage networksThe aim of the present work is to find a computational model, sufficiently simplified for practical use which determines the sensitivity of the complex high-voltage electrical networks when switching compensatory powers. We show how this model can be used as a basis for creating practical criteria for a one-valued choice in the two situations. First, switching the compensatory power does not lead to leaving the permissible range of voltage. In this case the power which minimizes the power losses is used. Second, the compensatory power is switched in order to return the voltage to the permissible range. Then that compensatory medium is chosen which is sensitive enough in addition to causing the minimal increase in electrical power losses.

scholarly journals Method for determining the maximum load of consumers in city power supply systems

2019 ◽  
Vol 139 ◽  
pp. 01078 ◽  
Author(s):  
A.G. Saidkhodjaev ◽  
A.M. Najimova ◽  
A.K. Bijanov
Keyword(s):  
Power Supply ◽  
Maximum Load ◽  
High Accuracy ◽  
New Method ◽  
Electrical Networks ◽  
Electric Networks ◽  
Reliable Determination ◽  
Supply Systems

In this article, we propose a new method for determining the maximum load of electric consumers in urban electric networks, which differs from existing methods in more accurate and reliable determination of the maximum loads. Based on the determination of the maximum loads of the objects of urban electrical networks, it is concluded that the proposed methods are determined by high accuracy and minor errors.

Augmented Short-Circuit Test for the Measurement of Transformer Equivalent-Circuit Parameters with Large Series Branch Impedances

2010 ◽  
Vol 47 (1) ◽  
pp. 86-93
Author(s):  
Saurabh Kumar Mukerji ◽  
Moleykutty George
Keyword(s):  
Equivalent Circuit ◽  
High Voltage ◽  
Single Phase ◽  
Short Circuit ◽  
Large Series ◽  
Test Results ◽  
Voltage Supply ◽  
Short Circuit Test ◽  
Equivalent Circuit Parameters

An augmented short-circuit test is described for the determination of equivalent-circuit parameters of single-phase transformers with large series-branch impedances. This test may be conducted at rated currents with the transformer connected to a reduced voltage supply. Thus harmonics in current and voltage waves are negligible. This test is therefore free from harmonics-associated errors. Based on test results, phasor equations are found which give formulae for the equivalent-circuit parameters with series-branch impedance split into low- and high-voltage components.

scholarly journals SOME OF THE USE OF THE STATE TINISTORCOMS OF REACTIVE POWER IN THE SYSTEM OF THE INDUSTRIAL AND HIGH-POWERED ELECTRIC NETWORKS

2020 ◽  
Vol 2020 (1) ◽  
pp. 193-194
Author(s):  
Igor' Golovanov ◽  
Denis Kuznecov-Novgorodcev ◽  
Kirill Klyucharev ◽  
Natal'ya Tumurova
Keyword(s):  
High Voltage ◽  
Reactive Power ◽  
Supply System ◽  
The State ◽  
Electricity Supply ◽  
Electrical Networks ◽  
Electric Networks ◽  
Industrial Enterprises

Some aspects of the use of static tiristor reactive power compensators in the electricity supply system of industrial enterprises and high-voltage electrical networks are considered

scholarly journals Optimization of Electrical Networks Modes on Transformation Coefficients of Transformers

2020 ◽  
Vol 216 ◽  
pp. 01095
Author(s):  
Tulkin Gayibov ◽  
Sherkhon Latipov ◽  
Davron Abdurashidov
Keyword(s):  
Minimum Energy ◽  
Energy Losses ◽  
Electrical Networks ◽  
Electric Networks ◽  
The World ◽  
Distribution Of Power ◽  
Technological Constraints ◽  
Transmission And Distribution ◽  
Minimum Costs

Optimization of modes of electrical networks provides for the determination of rational values of reactive powers of controlled sources, voltages of reference nodes and transformation coefficients of adjustable loop transformers, at which the minimum costs associated with the production, transmission and distribution of electricity are ensured and all the specified operating and technological constraints are met. As a result of a lot of work performed by specialists from all over the world on the development of methods and algorithms for optimization the modes of electrical networks, at present, the methods for optimization of reactive powers and voltages of nodes are quite developed. At the same time, the algorithms for optimization of transformation coefficients of transformers, taking into account the provision of permissible voltage levels and minimum energy losses in closed electric networks by ensuring the optimal distribution of power flows in them, requires corresponding improvement. In this regard, this work proposes a new algorithm for optimization of modes of electrical networks on transformation coefficients of adjustable loop transformers. The results of researched the effectiveness of the proposed algorithm are presented.

Sign in / Sign up

Export Citation Format

Share Document