Direct Current Algorithm for Protection Relays of 6–35 kV Electric Networks
Dmitrichenko V. Abdimuratov Z. Omirzakov N. Bashkirov M. Nigmatullin R.
March 2024Springer
Smart Grids and Sustainable Energy
2024#9Issue 1
The goal of this research work is to study the issues of protecting the electric equipment and cable and overhead transmission lines of 6–35 kV electric networks from overvoltage and earth fault as well as search for possibilities of upgrading the protection of these networks during operation. The methodology of this study is based on combining the system-level analysis of the operating principles of distributing networks of energy-consuming facilities with the analytical survey of the backbone aspects of the relay protection of the specified electric networks from overvoltage and earth faults. This protection is based on using the developed algorithm that allows the separation of direct current from the zero sequence current of the damaged outgoing feeder during an earth fault. Experimental findings on the Converter’s operation, which amplifies signals from the Zero-Sequence Current Transformer (ZSCT) of an outgoing feeder and extracts direct current (Idc), reveal its significance in SPEF protection for 6–35 kV networks. Idc is consistently present during various SPEF modes, and a four-to-sixfold multiplier circuit optimizes accuracy and sensitivity. In conclusion, the Idc algorithm’s advantage lies in its comprehensive coverage of ZSC harmonics, enhancing sensitivity and reliability, making it suitable for centralized protection relays. With a simple circuit design and immunity to electromagnetic interference, the Converter addresses the need for advanced protection measures in energy facilities’ electric systems.
Current harmonic composition , Earth fault , Electric networks , Outgoing feeder , Zero sequence current
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Almaty University of Power Engineering and Telecommunications, Almaty, Kazakhstan
Almaty University of Power Engineering and Telecommunications
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Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026