Journal
Scientific and technical journal «Priborostroenie»
UDK62-83
Issue:6 (63)
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SYSTEM OF INSULATION STATUS MONITORING FOR ELECTRIC DRIVES IN NETWORKS WITH A DEAD-EARTH NEUTRAL
Annotation
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.
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