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Case of Improper Proximity Sensor Installation Discovered by Shaft Current Monitoring

Published Feb 9th, 2026 Iris Power

Company: Hydro Power Plant in Quebec, Canada
Machine: Unit 12, 13.8 kV 83.34 MW 128.6 rpm 56-pole hydro generator rewound in 2024
Summary: A shunt resistor that measures the shaft current was burnt due to high current

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Iris Power, founded in 1990, offers sensors, monitors and diagnostic solutions for the assessment of the actual state of generators, motors, dry-type transformers and air-insulated switchgear, so that the risk assessed and the necessary maintenance can be planned. In 2010 Iris Power LP was acquired by Qualitrol Corporation, a global leader for condition-based monitoring.

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