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Nowadays Permanent Magnet Synchronous Motor (PMSM) are an attractive alternative to induction machines for a variety of applications due to their higher efficiency, power density and wide constant power speed range. In this context the condition monitoring of magnets status is receiving more and more attention since is critical for industrial applications. This paper presents a characterization of...
In this paper a study about the different effects of shaft eccentricities on the external electric variables of a brushless salient-pole synchronous generator for ship onboard service is presented. Static and dynamic rotor eccentricities were simulated by using a dynamic mesh-model including inductances computed by an improved MWFA-based analyses and by 3D FEM, and taking in account the damping effect...
Eccentricity related faults in induction motors have been studied extensively over the last few decades. They can exist in the form of static or dynamic eccentricity or both, in which case it is called a mixed eccentricity fault. These faults cause bearing damage, excessive vibration and noise, unbalanced magnetic pull (IMP) and under extreme conditions stator-rotor rub which may seriously damage...
Power transformers figure amongst the most costly pieces of equipment used in electrical systems. Major research effort has therefore focused on detecting failures of their insulating systems prior to unexpected machine outage. Although several industrial methods exist for the on-line and off-line monitoring of power transformers, all of them are expensive and complex, and require the use of specific...
The aim of this paper is to compare two modeling methods for a wound-rotor induction machine in order to simulate it in both healthy and faulty modes. The circuit-oriented approach which represents the machine model as a rotating transformer will be compared to the discrete event method. First, the wound-rotor induction machine model will be described using the classical equations in the abc reference...
Condition-based maintenance for turbine generators (TG) is given in the paper. Defects in stator winding and in magnet core are determined before repair on the basis of double-coordinate on-line discharge events location. Full information about ground wall semiconductivity layer in bars, slot discharges, sparking between plates in magnet core are provided by generators measurements operating load...
This paper contains summary information on Diacs technology principles comprising the following subjects: power transformers on-line testing and defects location procedure; on-line diagnostic technology and data analysis; examples of test results. Possible failure scenarios are observed here, as well as general tools available for power transformer life assessment. Specific technology of Diagnostic...
Different automatic procedures to estimate induction machines parameters, known as self-commissioning, can be found in literature. They usually involve supplying a single phase or two series-connected phases. An ideal machine should present the same behavior at all terminals, while in an actual machine non-idealities alter the response to the signals. Some techniques to state machine condition during...
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