scholarly journals Evaluating the Impact of Pre-clustering and Class Imbalance on Solar Flare Forecasting

2018 ◽  
Author(s):  
Mirelle C. Bueno ◽  
Guilherme P. Coelho ◽  
Ana Estela A. Da Silva ◽  
André L. S. Gradvohl
Keyword(s):  
Machine Learning ◽  
Solar Flare ◽  
Transmission Lines ◽  
Solar Flares ◽  
Power Transmission ◽  
Class Imbalance ◽  
The Sun ◽  
Power Transmission Lines ◽  
Short Circuits ◽  
The Impact

Among the phenomena that occur on the surface of the Sun, solar flares may cause several damages, from short circuits in power transmission lines to complete interruptions in telecommunications systems. In order to mitigate these effects, many works have been dedicated to the proposal of mechanisms capable of predicting the occurrence of solar flares. In this context, the present work sought to evaluate two aspects related to machine learning-based solar flare forecasting: (i) the impact of class imbalance in training datasets on the performance of the predictors; and (ii) whether the incorporation of a pre-clustering step prior to the classifiers training contributes to a better prediction.

scholarly journals Allocation of 0.4 kV PTL Sectionalizing Units under Criteria of Sensitivity Limits and Power Supply Reliability

2021 ◽  
Vol 11 (24) ◽  
pp. 11608
Author(s):  
Alina Vinogradova ◽  
Alexander Vinogradov ◽  
Vadim Bolshev ◽  
Andrey Izmailov ◽  
Alexey Dorokhov ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Supply ◽  
Power Transmission ◽  
Short Circuit ◽  
Reducing Power ◽  
Power Transmission Lines ◽  
Electrical Networks ◽  
The Cost ◽  
The Impact ◽  
Supply Reliability

Sectionalizing 0.4 kV power transmission lines (PTL) improves power supply reliability and reduces electricity undersupply through the prevention of energy disconnection of consumers in the event of a short circuit in the power line behind the sectionalizing unit (SU). This research examines the impact of sectionalizing on power supply reliability and reviews the literature on sectionalizing unit allocation strategies in electrical networks. This paper describes the experience of the use of sectionalizing units with listing strengths and weaknesses of adopted technical solutions and describes the new structure of sectionalizing units. A new methodology is proposed, whereby there are two criteria for allocating SU in 0.4 kV power transmission lines. The first criterion is the sensitivity limits against single-phase short circuits used for calculating the maximum distance at which SU can be installed. The second criterion is power supply reliability improvement, evaluating the cost-effectiveness of installing sectionalizing equipment by reducing power supply outage time. The established methodology was put to the test on an actual electrical system (Mezenka village, Orel area, Russia), which demonstrated that the installation of a sectionalizing unit paid off.

Bio-Inspired Modeling Approaches for Human Networks With Link Dissipation

2019 ◽  
Author(s):  
Varuneswara Panyam ◽  
Astrid Layton
Keyword(s):  
Transmission Lines ◽  
Water Distribution ◽  
Energy Transport ◽  
Power Transmission ◽  
Ecosystem Model ◽  
Distribution Networks ◽  
Power Grids ◽  
Power Transmission Lines ◽  
The Impact ◽  
Human Networks

Abstract Structural similarities between human networks and biological ecosystems have inspired biomimetic design of human networks. The approach requires the networks to be represented as graphs, where the actors are nodes and the connections between actors are links. A major oversight in the application of ecosystem-based modeling to human networks thus far has been in the selection of actors and links. Transfers between species in a biological ecosystem are direct, happening when the species are co-located. Human networks often require a physical aid to complete the transaction, such as power transmission lines, pipelines, or vehicles. These exchange methods experience dissipation, which is not captured in current applications of ecosystem-based human network modeling. Human networks modeled as ecosystems thus far simply categorize exchanges as links in the graph, effectively forcing dissipation during material/energy transport to be neglected. This dissipation can sometimes be high relative to the total energy/material exchanged and thus is a potentially large oversight. Three hypothetical power grids and three Italian urban water distribution networks are used to quantify the impact of modeling interaction aids — power lines and water pipelines — as actors (and thus including any dissipation) in an ecosystem model. Ecological structural and flow metrics previously applied to human networks are evaluated between the two modeling methods. The comparison shows that the impact of this overlooked aspect is potentially significant and warrants consideration.

Machine Learning Approach to Detect Faults in Anchor Rods of Power Transmission Lines

2019 ◽  
Vol 18 (11) ◽  
pp. 2335-2339 ◽  
Author(s):  
Douglas Contente Pimentel Barbosa ◽  
Vinicius Leal Tarrago ◽  
Luiz Henrique Alves de Medeiros ◽  
Marcos Tavares de Melo ◽  
Lauro Rodrigo Gomes da Silva Lourenco Novo ◽  
...  
Keyword(s):  
Machine Learning ◽  
Transmission Lines ◽  
Power Transmission ◽  
Learning Approach ◽  
Power Transmission Lines ◽  
Machine Learning Approach

scholarly journals EMI radiation of power transmission lines in Malaysia

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 1136
Author(s):  
Azhan Fikry ◽  
Siow Chun Lim ◽  
Mohd Zainal Abidin Ab Kadir
Keyword(s):  
Magnetic Field ◽  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Power Transmission ◽  
Separation Distance ◽  
Power Lines ◽  
Power Transmission Lines ◽  
Exposure Limits ◽  
Electric And Magnetic Field ◽  
The Impact

Background: There has been rising concern amongst the public regarding their home's proximity to high tension power transmission lines. The primary cause of fear is the impact of the electromagnetic interference (EMI) radiation on the nearby occupants' health. Despite the presence of national permissible limits of EMI radiation, there is still lack of information with regards to the EMI radiation of the types of power lines configuration in Malaysia. Methods: The electric and magnetic fields of several selected power transmission lines were simulated using the EMFACDC software program from the recommendation ITU-T K.90. Five types of power transmission lines available in Malaysia are considered. Results: It was found that the simulated electric and magnetic field levels at all the power lines' right of way (ROW) boundary complies with the prescribed exposure limit. However, the electromagnetic fields (EMF) level increases significantly as the separation distance is reduced from 30m. For a more conservative approach, the ROW can be set at 30m across all transmission voltage level and corridor area condition. Conclusion: It can be concluded that Malaysia's power transmission lines are within the prescribed exposure limits. To further minimize the electric and magnetic field level, it is recommended that the residential building should be built at least 30 meters away from the power transmission lines, especially for the 275kV double circuit, 275/132kV quadruple circuit, and 500kV double circuit lines.

scholarly journals Location of overhead power lines within Bukowe hills mesoregion in relation to the assessment of forest area fragmentation

2021 ◽  
Vol 3 ◽  
pp. 41-52
Author(s):  
Paweł Pieńkowski ◽  
◽  
Marcin Stoltman ◽  
Bogusław Zakrzewski ◽  
◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Natura 2000 ◽  
Forest Area ◽  
Power Lines ◽  
Power Transmission Lines ◽  
Investment Projects ◽  
Overhead Power Lines ◽  
The Impact ◽  
Forest Habitats

National power grid in Poland requires modernisation, therefore by 2030 numerous actions are scheduled regarding the expansion of the existing network and the construction of new electricity transmission lines (power lines). The planned activities will undoubtedly change the quality of landscape and result in fragmentation of forest habitats, some of which are characterised by high biodiversity and constitute a key element of ecological corridors. The aim of the present paper was to outline the issue of the impact of the power line corridors on forest habitat fragmentation, as well as to present the GuidosToolbox software (Graphical User Interface for the Description of image Objects and their Shapes) used, among other things, for the determination of the degree of fragmentation of forest habitats. The analysis concerned the Puszcza Bukowa forest, which is a part of the Natura 2000 network and is protected under the Szczecin Landscape Park ‘Puszcza Bukowa’. Despite abundant natural assets of the Puszcza Bukowa forest, it was necessary to run many power lines through its area due to location of the forest in the vicinity of the Szczecin agglomeration. The course of power lines contributed to the fragmentation of the discussed forest complex and to the depletion of its interior classified with the GuidosToolbox software as ‘Intact’. The software discussed in the present paper may prove useful in the identification of the degree of forest area fragmentation, connected with the course of high-voltage power transmission lines, and in the assessment of the impact of the planned investment projects on biocenoses.

scholarly journals Traveling-wave fault location algorithms in hybrid multi-terminal networks with a tree-like structure

2019 ◽  
Vol 124 ◽  
pp. 01012 ◽  
Author(s):  
R. G. Khuzyashev ◽  
I. L. Kuzmin ◽  
S. M. Tukaev ◽  
L. T. Tukhvatullin ◽  
E. G. Stepanova
Keyword(s):  
Transmission Lines ◽  
Traveling Wave ◽  
Propagation Velocity ◽  
Fault Location ◽  
Power Transmission ◽  
Hybrid Network ◽  
Power Transmission Lines ◽  
Arbitrary Configuration ◽  
Wave Methods ◽  
The Impact

Traveling-wave methods of the fault location prove their practical efficiency for the power transmission lines (TL) with an arbitrary configuration of any voltage class. This paper formulates algorithms to automate the process of the fault location in the TLs with a tree-like structure. The error of the simplified traveling-wave fault location (TWFL) algorithm based on the average propagation velocity of the transient signals (TS) is analyzed. A tabular algorithm for TWFL, which considers different propagation velocities of the TS in different segments of a hybrid network is proposed. An adaptive TWFL algorithm that considers the registration of the TSs with known places of their occurrence is proposed, to reduce the impact of the inaccuracy of the initial different network segments’ lengths and TS’s propagation velocity determination.

METHOD OF SYNTHESIS OF CLOSED-LOOP SYSTEMS OF ACTIVE SHIELDING MAGNETIC FIELD OF POWER TRANSMISSION LINES

2016 ◽  
Vol 2016 (4) ◽  
pp. 8-10 ◽  
Author(s):  
B.I. Kuznetsov ◽  
◽  
A.N. Turenko ◽  
T.B. Nikitina ◽  
A.V. Voloshko ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transmission Lines ◽  
Closed Loop ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Closed Loop Systems ◽  
Active Shielding

scholarly journals Time-Multiplexed Self-Powered Wireless Current Sensor for Power Transmission Lines

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1561
Author(s):  
Hao Chen ◽  
Zhongnan Qian ◽  
Chengyin Liu ◽  
Jiande Wu ◽  
Wuhua Li ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Current Measurement ◽  
Current Sensor ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Current Sensing ◽  
Self Powered

Current measurement is a key part of the monitoring system for power transmission lines. Compared with the conventional current sensor, the distributed, self-powered and contactless current sensor has great advantages of safety and reliability. By integrating the current sensing function and the energy harvesting function of current transformer (CT), a time-multiplexed self-powered wireless sensor that can measure the power transmission line current is presented in this paper. Two operating modes of CT, including current sensing mode and energy harvesting mode, are analyzed in detail. Through the design of mode-switching circuit, harvesting circuit and measurement circuit are isolated using only one CT secondary coil, which eliminates the interference between energy harvesting and current measurement. Thus, the accurate measurement in the current sensing mode and the maximum energy collection in the energy harvesting mode are both realized, all of which simplify the online power transmission line monitoring. The designed time-multiplexed working mode allows the sensor to work at a lower transmission line current, at the expense of a lower working frequency. Finally, the proposed sensor is verified by experiments.

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