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Electrical signature analysis (ESA) has been increasingly used in condition-based maintenance programs of synchronous generators. The fault diagnosis is based on the analysis of failure patterns in the current or voltage signatures, which allow to distinguish possible incipient faults in the machine. The failure patterns are usually dependent on the line frequency, rotor rotation frequency and some...
Recently, research concerning condition monitoring and fault diagnosis of electrical machines have experienced extraordinarily dynamic activity. The increasing importance of these energy conversion devices and their widespread use in uncountable applications have motivated significant research efforts. Various faults are occurring in the stator as well as in the rotor of 3-phase squirrel cage induction...
Recently, research concerning condition monitoring and fault diagnosis of electrical machines. The increasing importance of these energy conversion devices and their widespread use in uncountable applications has motivated significant research efforts. Various faults are occurring in the stator as well as in the rotor of 3-phase squirrel cage induction motor such as bearing fault, broken rotor bar...
This paper analyzes the feasibility of using the existing auxiliary winding in wound field brushless synchronous generator for condition monitoring. The auxiliary winding is the 4th winding placed in the stator of a three phase synchronous generator to feed exciter field through the automatic voltage regulator. This paper presents the model of a wound field synchronous generator with stator winding...
Condition monitoring of permanent magnet synchronous motors (PMSMs) is the process that identifies and averts impending faults and is of critical importance for reliability and robustness of overall system. In this study, magnet defect fault in PMSMs and the consequence effects of such failure on stator back-emf and current wave forms are investigated through modified magnetic equivalent circuit (MEC)...
Induction machines are widely used in different applications. Unpredicted breakdown of these machines usually leads to costly downtime and repairs. These expenses can be minimized by using proper condition monitoring techniques. Eccentricity fault is one of the widespread faults causing machine malfunction; its detection could be useful for preventing of harmful consequences. In this paper, different...
This paper develops and analyzes a parametric model for simulating healthy and faulty surface-mounted permanent magnet synchronous motors. It allows studying the effects of stator winding interturn short-circuit faults. A relevant feature of the developed model is that it deals with spatial harmonics due to a nonsinusoidal rotor permanent magnet configuration. Additionally, the proposed model is valid...
As remote and offshore wind turbines increase their contribution to renewable energy generation, effective and reliable condition monitoring techniques will be required to reduce failure downtime. This paper examines the possibilities for analysing electrical signals from the stator of wound rotor induction generators, commonly used in wind turbines. Previous work derived analytical expressions for...
This paper presents a method of detecting rotor faults in induction motors using the fast orthogonal search (FOS). Proper online condition monitoring of induction machines is very important to ensure safe operation, timely maintenance, and efficiency. It has been shown that when a fault occurs in the rotor, it will exhibit itself as a series of sidebands around the fundamental frequency in the stator...
In this paper the authors derive simple expressions for the frequencies of the harmonic components in the steady state stator line current of a DFIG operating under various conditions of supply and/or winding unbalance. The underlying purpose of the work is to identify signature frequencies which may be used in condition monitoring instrumentation to both identify and discriminate between a range...
This paper presents the technique for detection of shorted turns in stator winding of induction motors. The strategy is based on the dq0 voltage components. The proposed technique determines dq components of time domain of harmonics obtained from Park transformation instead of the stator phase voltage. Zero component (0) is calculated from the fundamental voltage excitation only. In the testing, the...
Unbalanced supply voltage is the major problem in using negative sequence current and third harmonic component as interturn short-circuit fault indicators. The purpose of this paper is to present an original analytical formula of all harmonic components related to unbalanced supply voltage induction motors. This formula is derived by the use of the KU transformation theory and the development is given...
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