Experimental Studies of the Dependence of the Current Flowing Through an Insulating Joint on Changes in Its Resistance

Vadim Nadezhkin; Il&#039;ya Bredun

doi:10.20295/1815-588X-2026-2-436-442

UDC

656.259.12

EXPERIMENTAL STUDIES OF THE DEPENDENCE OF THE CURRENT FLOWING THROUGH AN INSULATING JOINT ON CHANGES IN ITS RESISTANCE Experimental Studies of the Dependence of the Current Flowing Through an Insulating Joint on Changes in Its Resistance

АА Аа

Published in Proceedings of Petersburg Transport University · Pages 436–442 · Rubric: GENERAL TECHNICAL PROBLEMS AND SOLUTION APPROACH

DOI: https://doi.org/10.20295/1815-588X-2026-2-436-442

Received: 12.01.2026 Accepted: 14.04.2026 Published: 30.06.2026

Authors

Vadim Nadezhkin

Il'ya Bredun

Vadim Nadezhkin

Academic degree: candidate of technical sciences

Volga State Transport University Associate Professor · Automation, Telemechanics and Communications in Railway Transport · Russian Federation · Samara

Il'ya Bredun

Academic degree: candidate of technical sciences

Volga State University of Railway Transport Postgraduate Student · Department “Automation, Telemechanics and Communications in Railway Transport” at VSTU · Russian Federation

ABSTRACT

Objective: experimental verification of the hypothesis that the magnitude of the signal current flowing through an insulating joint of a track circuit is an informative diagnostic indicator. The research aims to establish a quantitative relationship between the change in the insulating joint’s resistance and the current strength, which is necessary for creating a system for continuous monitoring and predicting its pre-failure condition. Methods: field measurements were conducted on a railway test site using a Track Circuit Current Indicator (ITRC-M). Polynomial approximation using the least squares method (LSM) was applied to process the experimental data and obtain an analytical relationship. The model that provided the best fit to the experimental data was a third-degree polynomial. Results: an inverse relationship was established: as the resistance of the insulating joint decreases, the magnitude of the signal current flowing through it systematically increases. A high-precision mathematical model (a third-degree polynomial) was obtained, which reliably describes the experimental data within the operating range of resistances. It is shown that the behavior of the model beyond the measurement interval (asymptotically approaching negative infinity as the current decreases) eliminates the possibility of false-positive and false-negative predictions during diagnostics, confirming its reliability. Practical significance: the research results prove the fundamental possibility of developing and implementing a Technical Diagnostic and Monitoring System for Insulating Joints (STDM-IJ). Using the proposed diagnostic indicator (the magnitude of the signal current) will enable a transition from scheduled labor-intensive inspections to a system of continuous automated monitoring. This will improve traffic safety through the early detection of pre-failure conditions of insulating joints, reduce operational costs, and enhance the reliability of railway signaling and interlocking systems.

KEYWORDS

technical diagnostics, monitoring of header devices, predictive analytics, insulating joints, rail circuits, pre-fault conditions, signal current

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Editor-in-chief

Oleg S. Valinskiy

Deputy Editor-in-chief

Dmitry Kurilkin

It@pgups.ru

Science editor

Andrey Evstaf'ev

elt@pgups.ru

Edition

zhurnala P. Redakciya

izvestia@izvestiapgups.org

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GOST

Nadezhkin V. A., Bredun I. S. Experimental Studies of the Dependence of the Current Flowing Through an Insulating Joint on Changes in Its Resistance // Proceedings of Petersburg Transport University. 2026. no. 2. pp. 436-442. DOI: https://doi.org/10.20295/1815-588X-2026-2-436-442. (Date of access 06.09.2026).

MLA

Vadim Nadezhkin, Bredun I. S.. "Experimental Studies of the Dependence of the Current Flowing Through an Insulating Joint on Changes in Its Resistance." Proceedings of Petersburg Transport University 23.2 (2026): 436-442. DOI: https://doi.org/10.20295/1815-588X-2026-2-436-442.

APA

Nadezhkin V. A., Bredun I. S. (2026). Experimental Studies of the Dependence of the Current Flowing Through an Insulating Joint on Changes in Its Resistance. Proceedings of Petersburg Transport University, 23(2), 436-442. https://doi.org/10.20295/1815-588X-2026-2-436-442

Chicago

Vadim Nadezhkin, Bredun I. S.. "Experimental Studies of the Dependence of the Current Flowing Through an Insulating Joint on Changes in Its Resistance." Proceedings of Petersburg Transport University 23, no. 2 (2026): 436-442. https://doi.org/10.20295/1815-588X-2026-2-436-442.

WIKI

{{cite journal | author = Nadezhkin V. A., Bredun I. S. | title = Experimental Studies of the Dependence of the Current Flowing Through an Insulating Joint on Changes in Its Resistance | journal = Proceedings of Petersburg Transport University | year = 2026 | volume = 23 | issue = 2 | pages = 436-442 | doi = 10.20295/1815-588X-2026-2-436-442 }}

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EXPERIMENTAL STUDIES OF THE DEPENDENCE OF THE CURRENT FLOWING THROUGH AN INSULATING JOINT ON CHANGES IN ITS RESISTANCE Experimental Studies of the Dependence of the Current Flowing Through an Insulating Joint on Changes in Its Resistance

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