Electrical Signature Analysis Overview
Electrical Signature Analysis (ESA) is the general term for a set of electrical machine condition monitoring techniques through the analysis of electrical signals such as current and voltage. These techniques are: Current Signature Analysis (CSA), Voltage Signature Analysis (VSA), Extended Park’s Vector Approach (EPVA), Instantaneous Power Signature Analysis (IPSA), among others. The electrical motor of the rotating system under analysis is analyzed for the failure diagnosis purposes, acting as a transducer in this process. Variations in the voltage and current signals are analyzed in relation to some failure patterns.
FAULTS THAT CAN BE
DETECTED WITH Motor Current Signature Analysis (MCSA)
The major faults of electrical machines can broadly be classified by the following [3,13,23]:
- Static and/or dynamic air-gap irregularities.
- Broken rotor bar or cracked rotor end-rings.
- Stator faults (opening or shorting of one coil or more of a stator phase winding)
- Abnormal connection of the stator windings.
- Bent shaft (akin to dynamic eccentricity) which can result in a rub between the rotor and stator, causing serious damage to stator core and windings.
- Bearing and gearbox failures