Fourteen H.V. cage motors were diagnosed in a water intake facility in South Korea.

Current analyses techniques were applied to determine the condition of their rotor.

The application of classical techniques (MCSA) was combined with utilization of modern transient-based methods (ATCSA).

In 8 of the 14 motors, different levels of rotor damage were diagnosed.

The MCSA analyses already revealed the presence of rotor damages in some motors. Example: MCSA analyses for motor M1 (healthy) and for motor M8 (damaged rotor):

ATCSA analyses using both continuous and discrete tools enabled to reach a reliable diagnostic of the rotor fault:

The diagnosed severe level of rotor damage was confirmed when disassembling the motor M8 at the repair shop: 30 bars broken out of 112!!!