A high speed noncommunication protection scheme for power transmission lines based on wavelet transform

2013 ◽  
Vol 96 ◽  
pp. 194-200 ◽  
Author(s):  
Ammar A. Hajjar
Keyword(s):  
Wavelet Transform ◽  
Transmission Lines ◽  
High Speed ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Protection Scheme

scholarly journals Determination of isolator damages in electric power transmission lines with continuous wavelet transform and multitape power spectrum density

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Tahir Cetin Akinci ◽  
Winston Chung
Keyword(s):  
Wavelet Transform ◽  
Power Spectrum ◽  
Transmission Lines ◽  
Power Transmission ◽  
Power Spectrum Density ◽  
Continuous Wavelet ◽  
Power Transmission Lines ◽  
Collection System ◽  
Content Type ◽  
Spectrum Density

PurposeDetection of deformation of devices in high voltage electricity transmission line systems is an important issue in terms of economy and reuse. This study is aimed to detect devices that are deformed or thought to have suffered due to environmental and electrical reasons.Design/methodology/approachIn this experimental study, it was ensured that the sound and deformed insulators used in energy transmission lines were determined by the analysis of the sounds obtained by using the impact method. Equal intensity impact was applied to the isolator using the pendulum and the resulting sound noise signal analyses were made using power spectral density (PSD), magnitude scalogram (MS), multitape power spectrum density (MPSD) and continuous wavelet transform (CWT) methods in the study. In the analysis results, the isolators that are not visible to the eye and have certain damage were successfully separated from the intact insulators. Especially, MPSD and CWT analysis results are quite satisfactory.FindingsDamage analysis of insulators used in electricity transmission lines has been made. A total of 40 insulators were examined in two categories in their group, both damaged and not damaged. Data collection system was established. The data obtained from the data collection system were analysed and compared using four analysis methods. PSD, MS, MPSD and CWT analyses were made in the study. All the analyses carried out generally contain features that distinguish damaged and undamaged insulators from each other, the most successful results are MS and CWT results. CWT results are very successful in terms of time and amplitude, and it has been proposed as a method that can be used to separate damaged and undamaged insulators.Originality/valueIt can be suggested as a result of experimental tests that the results of CWT analysis can be used in the pulse noise method in isolators to be tested for reuse in electrical power transmission lines.

Windbreaks working as barriers to high speed winds for protection of electric power transmission lines and towers

2017 ◽  
Vol 82 ◽  
pp. 753-764 ◽  
Author(s):  
Carlos D.F. Barbosa ◽  
Carlos Severino ◽  
Edson Matsumoto ◽  
Liu Guijun ◽  
Lucila Labaki ◽  
...  
Keyword(s):  
Electric Power ◽  
Transmission Lines ◽  
High Speed ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Electric Power Transmission Lines

scholarly journals Fault simulation in networks with isolated neutral to find the fault location in power transmission lines

2021 ◽  
Vol 2131 (3) ◽  
pp. 032045
Author(s):  
I V Belitsyn ◽  
M I Pestov ◽  
I A Pavlichenko ◽  
A I Belitsyn
Keyword(s):  
Wavelet Transform ◽  
Transmission Lines ◽  
Fault Location ◽  
Power Transmission ◽  
Fault Simulation ◽  
Time Interval ◽  
Temporal Position ◽  
Power Transmission Lines ◽  
Neutral Mode ◽  
Isolated Neutral

Abstract The paper deals with an urgent problem - determining the location of damage to an overhead power transmission line. In particular, the application of the wavelet transform is considered, which makes it possible to localize the temporal position of the frequencies and to determine the time interval of the presence of the frequency in the event of damage to the power line. The paper presents a mathematical model that makes it possible to determine the amplitude-frequency spectrum, by which it is possible to determine the presence of a certain frequency in the signal under study, by which it is possible to determine the fault location. Based on the wavelet transform, the spectra of the current and voltage in the damaged phase in the isolated neutral mode are obtained. It is shown that when the neutral mode is switched, there are no dangerous overvoltage or current surges in the network, and the overvoltage level is reduced.

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