Non-invasive diagnosis of incipient or actual faults ofgrid supplied induction machine is a well known technology.Motor Current Signature Analysis (MCSA) can be used forrotor and stator defects. These include stator current harmonicsat frequencies (1± 2s) f and also determining the negativesequence component of current space vector. Recently,deceleration tests which possibly can remove several drawbacksof MCSA have been proposed for rotor and stator faultdiagnosis.This paper attempts to compare the MCSA-based diagnosticprocedures with the results obtained using the deceleration tests.Experimental results show that although the deceleration testdoes not provide clear information on rotor defects, it provides adiagnostic index directly related to the percentage of shortedturns. This diagnostic index can be used to validate the MCSAbased diagnostic procedure
