Construction of a method to protect a traction electric network against short­circuit currents, based on the new attribute

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.186485

Keywords:

short circuit, feeder voltage, speed of voltage change, relay protection, duration of voltage drop, selective protection

Abstract

All types of relay protection are based on comparing the values for certain attributes under a system's normal and emergency operational modes. A new attribute for defining the emergency mode in a direct current traction electricity supply system has been proposed, namely, the speed of voltage drop in the feeder of a traction substation. It is known that at a short circuit in the traction network, its voltage is reduced. Its sharpest, almost linear, decrease is observed, first, at the first moment of the emergency transition process, and, second, at a short circuit site and at points near it. Therefore, the steepness of the front of such a reduction in a feeder voltage could become an attribute of short circuit. A given attribute makes it possible to determine the type of short circuit based on a distance from the power source. In addition, we have proposed the circuit solutions for implementing a system of protection based on this attribute. Three options for building such protection systems have been considered. A first option implies using a RC filter. A second variant employs a pulse transformer. A third option is to use a bridge scheme. Each scheme has its advantages and disadvantages; however, modern electronics and digital technology make it possible to implement any of them. In the future, this would facilitate the construction of a selective protection (in terms of distance) from short circuit. To this end, one needs to use as many protection kits as how many points along a traction line must be monitored. Such a system is also easily implemented by software using microprocessor equipment.

The practical results from our study at a section of traction power supply of the Dnieper Railroad make it possible to assert that the proposed technique for determining short circuits is rather effective. It could be used as an additional (backup) system in general relay-protective hardware. That would improve the reliability of power supply systems for traction networks. Overall, the considered technique for determining short circuits could be used in any DC power system

Author Biographies

Pavel Mikhalichenko, Kherson Branch of the National University of Shipbuilding named after Admiral Makarov Ushakova ave., 44, Kherson, Ukraine, 73022

Doctor of Technical Sciences, Associate Professor, Head of Department

Department of Automation and Electrical Equipment

Ivan Biliuk, Admiral Makarov National University of Shipbuilding Heroiv Ukrainy ave., 9, Mykolayiv, Ukraine, 54025

PhD, Associate Professor, Head of Department

Department of Automation

Olexandr Kyrychenko, Admiral Makarov National University of Shipbuilding Heroiv Ukrainy ave., 9, Mykolayiv, Ukraine, 54025

PhD, Associate Professor

Department of Automation

Victor Nadtochii, Kherson Branch of the National University of Shipbuilding named after Admiral Makarov Ushakova ave., 44, Kherson, Ukraine, 73022

PhD

Department of Automation and Electrical Equipment

Anatoly Nadtochiy, Kherson Branch of the National University of Shipbuilding named after Admiral Makarov Ushakova ave., 44, Kherson, Ukraine, 73022

PhD

Department of Automation and Electrical Equipment

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Published

2019-12-17

How to Cite

Mikhalichenko, P., Biliuk, I., Kyrychenko, O., Nadtochii, V., & Nadtochiy, A. (2019). Construction of a method to protect a traction electric network against short­circuit currents, based on the new attribute. Eastern-European Journal of Enterprise Technologies, 6(8 (102), 12–18. https://doi.org/10.15587/1729-4061.2019.186485

Issue

Section

Energy-saving technologies and equipment