Detection of humidity ingress using online common-mode insulation impedance-monitoring system

Abstract

Enhanced machine reliability through monitoring of its state of health is an emerging field of research. Ingress of contaminants such as moisture can effect electrical machine state of health and contribute to failure in winding insulation. This paper demonstrates the application of an online insulation health monitoring method to study the effect of moisture ingress on ground-wall insulation through practical experiment. The method, based on real-time high-frequency leakage current measurement, is implemented on a 2.83 kW machine during operation in open-loop configuration. The results are presented and discussed, demonstrating the feasibility of diagnosis of moisture ingress.

Keywords

• machine insulation
• electric current measurement
• leakage currents
• humidity measurement
• humidity sensors
• electric impedance measurement
• online common-mode insulation impedance-monitoring system
• enhanced machine reliability
• winding insulation
• online insulation health monitoring method
• ground-wall insulation
• moisture ingress detection
• humidity ingress detection
• state of health monitoring
• contaminants
• real-time high-frequency leakage current measurement
• open-loop configuration
• power 2.83 kW