Shaft voltages in generators with static excitation systems-problems and solution

Ammann, C.; Reichert, K.; Joho, R.; Posedel, Z.

doi:10.1109/60.4749

Cited by 70 publications

(33 citation statements)

References 1 publication

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“…Ovi naponi se prenose na ležajeve zahvaljujući parazitskoj kapacitivnosti pobudnog transformatora prema zemlji (Ct), parazitskoj kapacitivnosti namotaja rotora prema gvožđu rotora (Cw) i parazitskoj kapacitivnosti linije vratila prema zemlji koja se pre svega svodi na kapacitivnost ležaja prema zemlji (Cs). Potencijal na poslednjoj kapacitivnosti upravo predstavlja potencijal vratila Vs. [3], [5] Na slici 5 je prikazana podužna dispozicija turboagregata. Ispravljeni napon trofaznog punoupravljivog tiristorskog mosta (Vd) dat je sledećim izrazom:…”

Section: Uticaj Statičkog Sistema Pobude Na Potencijal Vratilaunclassified

“…[3], [5] Slika 6. Zamenska šema pobudnog sistema u analizi potencijala vratila Na osnovu ove zamenske šeme potencijal vratila se može izraziti na sledeći način:…”

Section: Uticaj Statičkog Sistema Pobude Na Potencijal Vratilaunclassified

“…Takođe, jasno je da potencijal vratila zavisi od kapaciteta vratila prema masi koji je definisan kvalitetom izolacije ležajeva. [3], [5] 4. Preventivne mere za smanjenje ležajnih struja i opasnih potencijala vratila Na slici 7 prikazana je još jednom podužna dispozicija turboagregata i na njoj obeležene sve potrebne mere za smanjenje ležajnih struja i opasnih potencijala vratila.…”

Section: Uticaj Statičkog Sistema Pobude Na Potencijal Vratilaunclassified

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Turboset shaft voltage

Klasnić¹,

Joksimović²,

Ćirić³

2016

Zb EI Nikola Tesla

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Kratak sadržaj: U radu je analizirana pojava potencijala vratila i ležajnih struja kod električnih mašina. Dat je pregled uzroka nastanka ovih napona i struja kao i eventualnih posledica. U nastavku je analiziran uticaj tiristorskog sistema pobude na veličinu potencijala vratila, prikazana je metoda za merenje potencijala vratila, predložene su preventivne mere za smanjenje potencijala vratila kod turboagregata. Na kraju su prikazani rezultati merenja potencijala vratila na jednom turboagregatu u okviru Elektroprivrede Srbije.Ključne reči: turboagregat, potencijal vratila, statički sistem pobude, ležajne struje UvodTokom rada električnih mašina, naizmenični (AC) i jednosmerni (DC) naponi se mogu indukovati u vratilu agregata. Preveliki potencijal vratila može dovesti do prevelikih ležajnih struja koje mogu prouzrokovati ozbiljna oštećenja ležajeva obrtnih električnih mašina. U ovom radu prikazani su rezultati merenja potencijala vratila turboagregata sa osvrtom na načine i uzroke nastanka ovih napona i njihove eventualne posledice. Merenja su izvršena na jednom turboagregatu u sklopu Elektroprivrede Srbije čiji su osnovni podaci dati u tabeli 1.

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Section: Uticaj Statičkog Sistema Pobude Na Potencijal Vratilaunclassified

“…[3], [5] Slika 6. Zamenska šema pobudnog sistema u analizi potencijala vratila Na osnovu ove zamenske šeme potencijal vratila se može izraziti na sledeći način:…”

Section: Uticaj Statičkog Sistema Pobude Na Potencijal Vratilaunclassified

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Turboset shaft voltage

Klasnić¹,

Joksimović²,

Ćirić³

2016

Zb EI Nikola Tesla

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“…4 are recorded under normal conditions at 3000 rpm with an excitation current of 40 A. The integral given in Equation (8) is simply multiplied by the length (L) of the machine given in Equation (9) to obtain the actual net flux (Wb) through the surface corresponding to the 2D path "AB." Fig.…”

Section: B Fe Modelmentioning

confidence: 99%

“…The behavior of shaft voltages during this period was presented along with different models to characterize the observed phenomena. Examples of these models, which utilize capacitive coupling and other effects such as non-ideal DC field excitation or three-phase rectifiers, are provided in [9] and [10]. Many circuit models that characterize shaft voltages and currents have also been proposed, such as the model presented in [11].…”

Section: Introductionmentioning

confidence: 99%

Semi-analytical Method for Predicting Shaft Voltage in Field-excited Synchronous Generators

Doorsamy¹,

Cronje²

2014

Journal of Power Electronics

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This study presents an electromagnetic model for predicting shaft voltages in a 2-pole field-excited synchronous generator. After the first observations on shaft voltages were made more than a century ago, extensive work has been conducted on eliminating, mitigating, and integrating the aforementioned phenomena. Given that emphasis has been placed on modeling shaft-and bearing-induced voltages in AC motors driven by variable frequency drives, similar efforts toward a model that is dedicated to generators are insubstantial. This work endeavors to improve current physical interpretation and prediction methods for shaft-induced voltages in generators through semi-analytical derivation. Aside from the experimental validation of the model, investigations regarding the behavior of shaft voltages under varying machine complexities and operating conditions clarify previous uncertainties regarding these phenomena. The performance of the numerical method is also assessed for application in eccentricity fault diagnosis.

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7 Antriebstechnik mit der Asynchronmaschine

Binder

2012

Elektrische Maschinen Und Antriebe

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Shaft voltages in generators with static excitation systems-problems and solution

Cited by 70 publications

References 1 publication

Turboset shaft voltage

Turboset shaft voltage

Semi-analytical Method for Predicting Shaft Voltage in Field-excited Synchronous Generators

7 Antriebstechnik mit der Asynchronmaschine

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