Ensuring the operability of feeder voltage control relay when power supply voltage harmonics deviate from standard values

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Abstract

BACKGROUND. Due to poor power quality for feeders, the power supply reliability decreases, leading to more failures of railway automation and telemetry devices. This paper discusses the influence of harmonics on the operation of a voltage control relay generating a signal to switch the feeder on load.

The relevance of the study is evidenced by the increased number of voltage control relay failures in operation, resulting in emergency situations and train delays.

AIM. To reduce the number of voltage control relay failures.

MATERIALS AND METHODS. Analysis of failures occurring during operation of voltage control relays, physical modeling of processes leading to failures and synthesis of solutions protecting from destructive processes leading to failures.

RESULTS. The authors determined the cause of voltage control relay failures, modeled destructive processes leading to failures, and proposed solutions to reduce failures associated with poor-quality power supply voltage.

CONCLUSION. The proposed solutions allowed to reduce the number of voltage control relay failures and enhance the power supply reliability of railway automation and telemetry devices.

About the authors

Vitaly A. Shatohin

Emperor Alexander I St. Petersburg State Transport University

Email: vital@crtc.spb.ru
ORCID iD: 0000-0003-2167-4189
SPIN-code: 5318-5089

Cand. Sci. (Engineering), Associate Professor

Russian Federation, St. Petersburg

Egor K. Chernov

Emperor Alexander I St. Petersburg State Transport University

Author for correspondence.
Email: egorsk-01@yandex.ru
ORCID iD: 0009-0000-7759-3367
SPIN-code: 4278-9776

postgraduate student

Russian Federation, St. Petersburg

References

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Supplementary files

Supplementary Files
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2. Fig. 1. Power entry diagram for intermediate stations

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3. Fig. 2. Nature of damage to voltage monitoring relay

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4. Fig. 3. Structural diagram of RNPP-311M

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5. Fig. 4. Power supply diagram of relay RNPP-311

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6. Fig. 5. KU(n) coefficient distribution

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7. Fig. 6. Oscillogram of the supply voltage from the station of Krasnoyarsk Railway (scale: )

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8. Fig. 7. a) modelling scheme, b) oscillogram of voltages and currents of normal mode (scale: )

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9. Fig. 8. Thermograms RNPP-311 in normal mode

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10. Fig. 9. Oscillogram of currents and voltages of RNPP-311M relay in the over-normalised harmonic mode (scale: )

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11. Fig. 10. a) surface thermogram RNPP-311 at the beginning of the experiment, b) surface thermogram RNPP-311after 15 minutes

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12. Fig. 11. Organisation of power supply of RNPP-311M from the SBP bus

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Copyright (c) 2025 Shatohin V.A., Chernov E.K.

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