Physical and Chemical Geotechnologies

Purpose

Creation and integration of relay protection combined structures based on microelectronic and electromechanical elements into distributed electric networks for costs reducing and improvement of their operation modes reliability, especially in conditions of several power sources or decentralized electricity supply systems. The availability of decentralized energy sources and their potential impact on the transient mode parameters in emergency of the power grid are examined.

Methodology

The methodology of combined structures creation is based on standard approaches of relay protection providing in compliance with technical restrictions and standard requirements concerning the possibility of power flows from several sources

Findings

The basic electric circuit of the protective relay device was developed, which allowed changing the relay protection settings in the autonomous mode, without losing the sensitivity of the mechanism for selecting the direction of power supply. The developed system will allow maintaining the selectivity in the after-failure mode or during the generation from decentralized energy sources, being guided by the power flow. Application of the microelectronic base in combination with traditional electromagnetic and inductive relays. Previously, protection relay devices were divided separately into electromechanical, electrostatic, microprocessor types without smart combinations of each types. The use of simple circuit solutions makes it possible to reduce the cost of relay protection devices, facilitate servicing and repair, and extend the life of equipment. The obtained results can be used by electric-grid companies to ensure reliable protection of the network, especially with the wide introduction of decentralized energy sources They contain the researches, which were conducted within the project GP – 488, financed by Ministry of Education and Science of Ukraine.

Keywords: combined relay protection system, schemes decisions, redundancy, microelectronic base, decentralized energy sources

References

1. Lutsenko, I.M. and Tsyhan, P.S. (2017), “Technical and economic aspects of the electric vehicles use in power networks of Ukraine”, Transactions of Kremenchuk Mykhailo Ostrohradskyi National University, vol. 6, no. 107, pp. 21–30. http://visnikkrnu.kdu.edu.ua/statti/2017_6_21-30_6-2017.pdf.
2. Hewitson, L., Brown, M. and Ramesh, B. (2004), “Practical Power Systems Protection”, Elsevier, pp. 96–133, available at: http://www.newnespress.com /pdf/.
3. Gurevich, V. (2014), “Power Supply Devices and Systems of Relay Protection”, International Standard Book, no. 13, pp. 26 – 40, available at: https://fajarahmadfauzi.files.wordpress.com/2015/12/power-supply-devices.pdf.
4. Blackburn, J. and Domin, T. (2006) “Protective Relaying: Principles and Applications”, CRC Press, Taylor & Francis Group LLC, pp. 31–48, available at: https://manautomata.files.wordpress.com/2016/02/protective_relaying_principles_and_ap plications_blackburn.pdf