Application of the wavelet transform in problems of searching for a damaged connection with a single-phase earth fault according to SV-stream data
https://doi.org/10.37493/2307-907X.2024.4.2
Abstract
Introduction. Research relevance is conditioned by the necessity to increase selectivity of protection and signaling devices for single-phase ground faults in 6-10 kV networks. Single-phase ground faults are one of the prevailing causes of equipment failures in the oil and gas production sector of Russia, which is the backbone of the economy.
Goal. The article aims is verification of the possibility of using the Sample Value data of IEC 61850 in the tasks of finding a faulty feeder with single-phase earth fault by means of wavelet transform.
Materials and methods. Wavelet transform with decomposition to the 6th level of zero-sequence current 3i0. Interpolation of SV-flow data. Determination of effective values of higher harmonic currents by wavelet coefficients.
Results and discussion. The magnitude of the relative deviation of the calculated effective values of the higher harmonic currents between the data of the current sensor with a sampling frequency of 12,800 Hz and the interpolated values of the SV flow with an increased frequency from 4,000 to 12,800 Hz was 1.18 % with damage to the connection feeding the nonlinear load and 2.86 % in the experiment with a sinusoidal load.
Conclusion. Experimental results show that the highest value of the sum of the higher harmonic currents corresponds to the feeder with the presence of a single-phase ground fault. The limited number of samples per period poses the challenge of interpolating the Sampled Value data up to a frequency of 12 800 Hz.
Keywords
Supporting agencies: The research has been conducted within the national assignment by the Ministry of Science and Higher Education in the Russian Federation (theme “Model building for wavelet analysis of non-steady behavior in electric power systems for reliability growth effectiveness for electric power supply to a customer”, theme code: FENG-2023-0005).
About the Authors
A. O. Paramzin
Yugra State University
Russian Federation
Russian Federation
Alexander O. Paramzin – Lecturer of Polytechnic School, Postgraduate Student
ScopusID: 57802315400
ResearcherID: AAK-8001-2021
16, Chekhova str., Khanty-Mansiysk, 628011
S. Yu. Dolinger
Yugra State University
Russian Federation
Russian Federation
Stanislav Yu. Dolinger – Cand. Sci. (Techn.), Associate Professor of Polytechnic School
ScopusID: 57190176871
ResearcherID: A-5526-2014
16, Chekhova str., Khanty-Mansiysk, 628011
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Review
For citations:
Paramzin A.O., Dolinger S.Yu. Application of the wavelet transform in problems of searching for a damaged connection with a single-phase earth fault according to SV-stream data. Newsletter of North-Caucasus Federal University. 2024;(4):17-27. (In Russ.) https://doi.org/10.37493/2307-907X.2024.4.2
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