Negative-sequence current filter based on inductance coils
Kletsel M. Mashrapov B. Mashrapova R. Kislov A.
February 2025Institute of Advanced Engineering and Science
International Journal of Electrical and Computer Engineering
2025#15Issue 124 - 35 pp.
The construction of new relay protection systems without the use of current transformers is a fundamental problem of electro energetics, which has not yet been solved. This works suggests a negative-sequence current filter which receives information from inductance coils (ICs) mounted at a safe distance in the magnetic field of phase currents. This filter does not require current transformers, thus saving high-quality copper, steel, and expensive high-voltage insulation in amount unprecedented for relay protection (a 6 to 110 kV current transformer has 19 to 480 kg in weight). A circuit (including functional diagnostics) and a technique for selecting the parameters of filter components and the points where ICs should be fixed are presented; a structure for IC fastening is described. Computer simulation and experiment were used for data collection. The data show that i) the filter conversion coefficient m= 1.6, and imbalance increases by 7% at the network frequency f= 48-52 Hz; ii) protections based on this filter should have a time delay; iii) the filter is not inferior to well-known well-tested filters with current transformers; and iv) it is functional, but can only be used for single-standing electrical installations.
Current filter , Experiment , Inductance coil , Negative sequence , Simulation
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Department of Electric Power Industry, Faculty of Energetics, Toraighyrov University, Pavlodar, Kazakhstan
Department of Electrical Engineering and Automation, Faculty of Energetics, Toraighyrov University, Pavlodar, Kazakhstan
Department of Electric Power Industry
Department of Electrical Engineering and Automation
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