Determination of the magnitude of short-circuit surge current for the construction of relay protection on reed switches and microprocessors

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.245644

Keywords:

relay protection, reed switch, microprocessor, surge current, time measurement, magnetic field, transient

Abstract

A study of the functioning of reed switches under the influence of a magnetic field created by a current in a conductor in a transient mode with the presence of an aperiodic component has been carried out. A well-known method for determining current using reed switches was implemented. At the same time, it was determined that the originally formulated method did not give the required result within the limits of errors. This is most likely due to the peculiarities of the mechanism of movement of the reed switch contacts. Alternatively, the measurements were taken to take the return currents instead of the pick-up currents and the time between the return times. They are more stable. Simulation is performed, experimental determination of the value of surge current by measuring time is carried out. The main element of the created installation was the power transformer coil with low active and high inductive resistance. As part of the study, the reed switches were placed in a magnetic field with an aperiodic component, as in the transient mode. This study will show the applicability of reed switches for the construction of relay protection devices that will not need current transformers to obtain information about the primary current in the conductor. In the course of the research, it was found that the error in determining the magnitude of current was no more than 10 %. Using microprocessors, it is possible to build relay protection devices with a speed of up to 20 ms. This result makes it possible to build new devices. Since in the well-known developments, it was only said about determining the magnitude of current in a steady state. When building relay protection devices on reed switches, without using current transformers, it will be possible to build backup protections that duplicate not only the devices themselves, but also the primary measuring transformers with other sensitive elements. This will improve the reliability of the power supply.

Author Biographies

Alexandr Neftissov, Astana IT University

PhD, Associate Professor

Research and Innovation Center "Industry 4.0"

Andrii Biloshchytskyi, Astana IT University

Doctor of Technical Sciences, Professor, Vice-Rector for Science and Innovation

Olzhas Talipov, Toraighyrov University (TOU)

PhD, Associate Professor

Department of Electrical Engineering and Automation

Oxana Andreyeva, Toraighyrov University (TOU)

PhD, Associate Professor

Department of Electrical Engineering and Automation

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Published

2021-12-21

How to Cite

Neftissov, A., Biloshchytskyi, A., Talipov, O., & Andreyeva, O. (2021). Determination of the magnitude of short-circuit surge current for the construction of relay protection on reed switches and microprocessors. Eastern-European Journal of Enterprise Technologies, 6(5 (114), 41–48. https://doi.org/10.15587/1729-4061.2021.245644

Issue

Vol. 6 No. 5 (114) (2021): Applied physics

Section

Applied physics

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Copyright (c) 2021 Alexandr Neftissov, Andrii Biloshchytskyi, Olzhas Talipov, Oxana Andreyeva

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