Dolinger S.Yu., Osipov D.S., Paramzin A.O., Paramzina Yu.D. Development and Hardware Testing of a Selective Detection Algorithm for Single Phase-To-Ground Faults Using Wavelet Transformation

Abstract

Full Text

The paper presents the design and experimental testing of a functional model for a selective single-phase ground fault alarm device developed by the authors for 6 (10) kV distribution networks. The research key feature is the physical testing of a previously developed algorithm that identifies damaged connections by analyzing the energy spectrum of high-frequency components. The authors tested the algorithm using real current signals generated by the RITM semi-natural simulation complex and a Ponovo amplifier. The functional model processed the test signals in real time mode, which corresponded to the secondary circuits of zero-sequence current transformers (range 0–1 A). The paper describes a three-channel measurement module based on an AMC1200 isolated amplifier and a 16-bit AD7606 ADC with galvanic isolation up to 4 kV. This module provides synchronous digitization of zero-sequence currents at a sampling frequency of 12.8 kHz, which is determined by the wavelet transformation-based algorithm used to identify damaged connections. An STM32F407ZGT6 microcontroller running FreeRTOS serves as the computing core. The test results show that the functional model correctly identified damaged connections when working with physical current circuits. The ratio of the damaged line spectrum energy to the minimum value among healthy connections ranged from 25 to 30 p.u., while the threshold value was set at 1.5 p.u. The experiments confirmed the algorithm stability to changes in the nonlinear load connection point and demonstrated the measuring circuit operability under conditions close to real-life applications. These results can support the development of intelligent protection devices and serve as a basis for modifying existing solutions in selective protection of distribution network.

Keywords

single phase-to-ground faults, wavelet transformion, relative measurement method, harmonic components, hardware realization, physical current signals, energy spectrum, zero-sequence current

Stanislav Yu. Dolinger Ph.D. (Engineering), Associate Professor, Information Security Department, Moscow State University of Geodesy and Cartography, Moscow, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., https://orcid.org/0000-0001-6897-4440

Dmitry S. Osipov D.Sc. (Engineering), Associate Professor, Polytechnic School, Yugra State University, Khanty-Mansiysk, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., https://orcid.org/0000-0002-0830-408X

Alexander O. Paramzin Ph.D. (Engineering), Associate Professor, Polytechnic School, Yugra State University, Khanty-Mansiysk, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., https://orcid.org/0000-0002-7266-4493

Yulia D. Paramzina Postgraduate Student, Polytechnic School, Yugra State University, Khanty-Mansiysk, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it.

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Dolinger S.Yu., Osipov D.S., Paramzin A.O., Paramzina Yu.D. Development and Hardware Testing of a Selective Detection Algorithm for Single Phase-To-Ground Faults Using Wavelet Transformation. Elektrotekhnicheskie sistemy i kompleksy [Electrotechnical Systems and Complexes], 2026, no. 1(70), pp. 60-66. (In Russian). https://doi.org/10.18503/2311-8318-2026-1(70)-60-66

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