Modeling of synchronous machines with damper windings for condition monitoring

Rahimian, Mina M.; Butler‐Purry, Karen L.

doi:10.1109/iemdc.2009.5075264

Cited by 18 publications

(10 citation statements)

References 7 publications

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“…In particular, SGs models which include the rotor damper winding consist of 'm + b + 2' circuits magnetically coupled to each other, where m and b are the number of stator phases and rotor bars, respectively. It is common to model the damper cage as 'b + 1' loops [31], thus allowing to derive the voltage equations in the matrix form as given in (4), where the vectorī represents the currents flowing in the phases andψ the fluxes linking with the phases.v…”

Section: A Preliminary Analytical Considerationsmentioning

confidence: 99%

Improved Damper Cage Design for Salient-Pole Synchronous Generators

Nuzzo

Galea

Gerada

et al. 2017

IEEE Trans. Ind. Electron.

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Abstract-The benefits of implementing a damper winding in salient-pole, synchronous generators are widely known and well consolidated. It is also well known that such a winding incurs extra losses in the machine due to a number of reasons. In order to improve the overall efficiency and performance of classical salientpole, wound field, synchronous generators that employ the traditional damper cage, an improved amortisseur winding topology that reduces the inherent loss is proposed and investigated in this paper. This is essential in order to meet modern power quality requirements and to improve the overall performance of such 'classical' machines. The new topology addresses the requirements for lower loss components without compromising the acceptable values of the output voltage total harmonic distortion and achieves this by having a modulated damper bar pitch. As vessel for studying the proposed concept, a 4MVA, salient-pole, synchronous generator is considered. A finite element model of this machine is first built and then validated against experimental results. The validated model is then used to investigate the proposed concept with an optimal solution being achieved via the implementation of a genetic algorithm optimization tool. Finally, the performance of the optimised machine is compared to the original design both at steady state and transient operating conditions.

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Section: A Preliminary Analytical Considerationsmentioning

confidence: 99%

Improved Damper Cage Design for Salient-Pole Synchronous Generators

Nuzzo

Galea

Gerada

et al. 2017

IEEE Trans. Ind. Electron.

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“…Similar effects have been reported for the converter-fed synchronous machines with broken damper bars [40]. Winding function analysis and time-stepping FE analysis have been used to study the broken damper bars and end-rings [38,41].…”

Section: Damper Winding Faultmentioning

confidence: 66%

Modeling of Electric Machines Using Winding and Modified Winding Function Approaches

Nandi¹

2017

Electric Machines

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“…[6] proposes a method for the diagnosis of the fault based on the measurement of pole voltages differences in the field winding, which, as the authors admit, does not enable the monitoring of all damper bars. Other authors [7] have presented various synchronous machine models, which are able to simulate the presence of the aforementioned fault.…”

Section: Introductionmentioning

confidence: 99%

“…Although the design of damper windings is carried out taking into consideration both current and thermal stresses during their operation [5], eventual failure is possible, due to reasons such as deficient construction of the damper cage [6] or frequent and hard duty cycles (excessive start-stop cycles or frequent speed changes [7][8][9]). Despite the probability of occurrence of such a failure may be not high in some applications-in fact, some authors reported the appearance of such a fault in a pumped storage salient-pole synchronous generator after almost 40 years of operation [8]-, its presence has been confirmed by other authors in other synchronous machines operating in real processes: small salient-pole machines [9], hydro-generators [10], single phase machines [11] and bulb generators [12].…”

Section: Introductionmentioning

confidence: 99%

Application of the Empirical Mode Decomposition to condition monitoring of damper bars in synchronous motors

Antonino-Daviu

Roger‐Folch

Pons-Llinares

et al. 2011

2011 IEEE International Symposium on Industrial Electronics

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Damper bars play an important role in synchronous motors. Among other functions, they enable the direct-on-line startup of these machines. Moreover, they allow enhancing their stability during load transients. However, the large currents and stresses to which those elements are subjected during their operation intervals increase the probability of winding deterioration and of eventual breakage. This paper presents a logical extension of a transient-based diagnosis approach, whose application was successfully assessed in conventional induction motors. The method is applied here to diagnose the condition of damper bars in synchronous motors. It is based on the capture of the stator startup current of the machine and its further analysis in order to track the characteristic transient evolutions of a particular fault-related harmonic in the time-frequency map. For this purpose, the Hilbert-Huang Transform (HHT), based on the Empirical Mode Decomposition (EMD) method, is used here as proposed signal processing tool, even though other tools may be also viable. Simulations as well as experimental results on a laboratory synchronous machine prove the validity of the approach for condition monitoring of such elements.

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Modeling of synchronous machines with damper windings for condition monitoring

Cited by 18 publications

References 7 publications

Improved Damper Cage Design for Salient-Pole Synchronous Generators

Improved Damper Cage Design for Salient-Pole Synchronous Generators

Modeling of Electric Machines Using Winding and Modified Winding Function Approaches

Application of the Empirical Mode Decomposition to condition monitoring of damper bars in synchronous motors

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