DOI 10.17586/0021-3454-2020-63-6-515-521
UDC 62-83
SYSTEM OF INSULATION STATUS MONITORING FOR ELECTRIC DRIVES IN NETWORKS WITH A DEAD-EARTH NEUTRAL
National Research University “Moscow Power Engineering Institute”, Moscow, 111250, Russian Federation; Head of Department
Шпак Д. М.
Федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ"; инженер
R. Strzelecki
Gdańsk University of Technology, Gdańsk, 80-233, Poland; Professor
G. L. Demidova
ITMO University, Saint Petersburg, 197101, Russian Federation; Associate professor
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Abstract. A method for insulation fault detection in variable speed drives operating in TN-networks is proposed. The insulation monitoring system is activated when the electric drive stops. The inverter keys are switched according to a special law, and the leakage current is determined using the current transformer signal, which measures the current in all three phases of the drive simultaneously. The leakage current sensor schematic is considered, and experimental results for various values of insulation resistances are presented. It is shown that the minimum insulation resistance detectable with the method equals approximately to 2 MΩ or lower.
Keywords: insulation fault detection, network with a dead-earth neutral, frequency converter, leakage current, current transformer
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