Adaptation of power lines fault location methods to voltage characteristics deviations

The influence of voltage characteristics deviations, acceptable in normal operation of power grid, at power lines emergency state fault location methods precision is considered. The error distributions of emergency state fault location methods across power line length under frequency deviation, single rapid voltage changing and supply voltage unbalance variation are received. The way of emergency state fault location adaptation to voltage characteristics deviations is offered.

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Increase of Accuracy of the Fault Location Methods for Overhead Electrical Power Lines

Advances in Materials Science and Engineering ◽

10.1155/2018/3098107 ◽

2018 ◽

Vol 2018 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Vladimir Lebedev ◽

Galina Filatova ◽

Alexander Timofeev

Keyword(s):

Fault Location ◽

Electrical Power ◽

Energy System ◽

Power Lines ◽

Location Determination ◽

Determination Methods ◽

Location Methods ◽

High Voltage Power Lines ◽

Electric Supply

The high-voltage power lines are quite often damaged parts of the energy system. Line outage is always accompanied by undersupply of energy and decrease of reliability, cost, and quality of electric supply. That is why one of the important tasks of line maintenance is quick looking for location of the damage and organization of the rehabilitation. The main part of this work includes development and research of the methods and algorithms for fault location based on one-sided measurement and the ways to increase their accuracy. This type of measurement uses signals from digital current and voltage transformers as input. The influence of the basic distorting factors on the accuracy of the fault location determination methods is also considered.

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Characterisation of Signal Amplitude-Frequency for Indoor Power Line Communication Channel in the 1 — 30 MHz Broadband Frequencies

International journal of electrical and computer engineering systems ◽

10.32985/ijeces.12.1.4 ◽

2021 ◽

Vol 12 (1) ◽

pp. 33-41

Author(s):

Adedayo Oluyomi Ajibade ◽

llesanmi Banjo Oluwafemi ◽

Israel Esan Owolabi

Keyword(s):

High Speed ◽

Communication Channel ◽

Power Grid ◽

Signal Transmission ◽

Low Frequency ◽

Signal Amplitude ◽

Power Line ◽

Power Grids ◽

Power Lines ◽

Power Line Communication

The transmission of data signals over power lines is a very promising technique for delivering indoor broadband communication services. However, since power grids were originally designed for high-voltage low-frequency signal transmission, there is a frequency mismatch between the power grid and high-frequency data signals. This mismatch poses a challenge to deploying power lines as a communication channel. Although, studies and researches conducted in several countries have made transmission of data over power lines possible, the behaviour and properties of the power grid cannot be generalised. Hence, the need for in-depth experiment and measurement on the suitability and capability of the Nigerian power grid for data transmission is crucial for proper characterising and modelling of the power line communication (PLC) channel. In this paper, we present experimental measurements and results of the effects of frequency variations on the attenuation experienced by broadband high-speed data signals transmitted over the Nigerian indoor power line network.

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Analysis of influence of external atmospheric factors on the accuracy of fault location on overhead power lines

E3S Web of Conferences ◽

10.1051/e3sconf/202017801057 ◽

2020 ◽

Vol 178 ◽

pp. 01057

Author(s):

Olga Ahmedova ◽

Anatoliy Soshinov ◽

Natalia Shevchenko

Keyword(s):

Fault Location ◽

Short Circuit ◽

Power Line ◽

Power Lines ◽

Electrical Grids ◽

Short Circuits ◽

Atmospheric Factors ◽

Overhead Power Lines ◽

Overhead Power Line ◽

Emergency Mode

Devices of fault location are widespread in electrical grids. In overhead power lines of voltages of 10 kV and higher, such devices are based on measurements of parameters in emergency mode. These devices can be divided into two main groups: designed to determine fault location of short circuits and of ground short circuit. In both cases, when detecting fault location, analyzed are not only the current and voltage parameters at the accident time, but also the parameters of overhead power line. When analyzing equivalent circuits of power lines, approximate tabular values of direct and quadrature parameters are used. It was revealed, that the line parameters are significantly affected by external atmospheric factors: ambient temperature, soil moisture, wind strength and direction, ice formation, etc. To accurately determine the fault location, it is necessary to evaluate the influence of these factors on the linear parameters of the overhead line. The paper presents analysis of the influence of changes in atmospheric factors on parameters of overhead power line. A methodology for calculating the operation setpoints of the device for fault location in power line is given.

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Research on Transmission Line Fault Location Based on the Fusion of Machine Learning and Artificial Intelligence

Security and Communication Networks ◽

10.1155/2021/6648257 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Xiao-Wei Liu

Keyword(s):

Transmission Line ◽

Transmission Lines ◽

Traveling Wave ◽

Fault Location ◽

Ant Colony Algorithm ◽

Normal Operation ◽

Location Error ◽

Transmission Grid ◽

Wave Signal ◽

Location Methods

After a transmission line fails, quickly and accurately find the fault point and deal with it, which is of great significance to maintaining the normal operation of the power system. Aiming at the problems of low accuracy of traditional traveling wave fault location methods and many affected factors, this paper relies on distributed traveling wave monitoring points arranged on transmission lines to study methods to improve the accuracy of traveling wave fault location on transmission lines. First, when a line fails, a traveling wave signal that moves to both ends will be generated and transmitted along the transmission line. We use the Radon transform algorithm to process the traveling wave signal. Then, this paper uses ant colony algorithm to analyze and verify the location and extent of transmission line faults and then optimizes high-precision collection and processing. Finally, the simulation distance measurement is carried out on double-terminal transmission lines and multiterminal transmission lines (T-shaped lines) with branches. The results show that, for double-ended transmission lines, the algorithm increases the speed of matrix calculations and at the same time makes the fault location error of the transmission grid still maintain the improved effect.

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ELECTRICAL NETWORK OF FAULT REGIME MODEL CONSTRUCT FEATURES IN A SINGLE-END TRAVELING WAVE FAULT LOCATION METHOD

Vestnik Chuvashskogo universiteta ◽

10.47026/1810-1909-2021-3-133-139 ◽

2021 ◽

pp. 133-139

Author(s):

Aleksey O. Fedorov ◽

Vladimir S. Petrov ◽

Vitaliy A. Hristoforov

Keyword(s):

Traveling Wave ◽

Fault Location ◽

Arrival Time ◽

Short Circuit ◽

Characteristic Impedance ◽

Line Length ◽

Power Line ◽

Electrical Network ◽

Arrival Times ◽

Location Method

In the single-end traveling wave (TW) fault location methods, for determining TW front, the arrival time of which is determined by the place of the short circuit (SC) on the power line, electrical network of fault regime models are constructed. From the electrical network of fault regime models, only one is selected that allows, by the first TW front magnitude and its arrival time, to obtain estimations of the TWs fronts magnitudes and their arrival times which are closest to the corresponding quantities determined from locator measurements. Based on the selected electrical network of fault regime model the used TWs are identified and the fault place is determined. Known implementations of the single-end traveling wave fault location method use simplified electrical network of fault regime model: the influence of the fault type and its resistance, as well as the parameters of the electrical network elements, are not taken into account on the TWs fronts magnitude. These disadvantages can cause both an increased error in determining the fault location and even failure in the operation of the locator. In this article, the theory of constructing electrical network of fault regime model is presented: the influence of fault location and its type on the TWs fronts magnitude are considered. Particular attention is paid to the study of the issue of the TWs generation as a result of the cross-transmission effect. It is shown that in order to correctly determine the used TW front in the electrical network of fault regime model, in addition to the power line length and its characteristic impedance, it is necessary to take into account the short circuit type and its resistance, and the possible TWs generation in one mode under the influence of TWs in another one.

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Comparison of Screening Configurations for the Mitigation of Voltages and Currents Induced on Pipelines by HVAC Power Lines

Energies ◽

10.3390/en14133855 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3855

Author(s):

Arturo Popoli ◽

Leonardo Sandrolini ◽

Andrea Cristofolini

Keyword(s):

Finite Element Analysis ◽

Cross Sections ◽

Detrimental Effect ◽

Power Line ◽

Skin Depth ◽

Power Lines ◽

Element Analysis ◽

3D Finite Element ◽

Different Shapes ◽

High Magnetic Permeability

In this paper, a strategy for reducing the electromagnetic interferences induced by power lines on metallic pipelines is proposed and numerically investigated. The study considers a set of steel conductors interposed between the power line and the pipeline. Different shapes of conductor cross sections and different magnetic permeabilities are considered, to identify the solution exhibiting the greatest mitigation efficiency for the same amount of material. The investigation is carried out by means of a quasi-3D finite element analysis. Results show that the main mechanism responsible for the mitigation is constituted by the currents induced in the screening conductors by the power line. Hence, a high magnetic permeability can have a detrimental effect since it reduces the skin depth to values below the size of the screening conductor. In this case, a reduction of the screening current and in the mitigation efficiency is observed. Nevertheless, the study shows that the use of strip-shaped screening conductors allows the employment of cheaper magnetic materials without compromising the mitigation efficacy of the screening conductors.

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