Evaluating Stator Core Interlamination: High Flux Test of Large AC Electric Machines using Telemetry

The stator core high flux test or core loop test of large generators, used to evaluate the interlaminar insulation and the settling of the stator core prior to its final tightening, requires the rotor to be removed and large excitation cables to be wrapped around the stator core, along with a high-power source. Once the core is energized to the required level of flux, typically 1.0 Tesla to 100% of the rated stator yoke flux density for new stator cores, the operator standing in the center of the stator core scans the bore to detect any hotspots using an infrared camera. To improve workplace health and safety during the core loop test, this paper presents two solutions using telemetry to minimize operator exposure to critical hazards such as high energy levels, high noise and vibration levels, and electromagnetic fields.