Problems of practical diagnostics of induction machines in industry

• Autorzy: Dybowski P. , Rams W. , Rusek J.
• Języki publikacji: EN

Abstrakty

EN

There are many problems in practical diagnostics of high-power, squirrel-cage induction machines, operated in industrial conditions. These problems make the diagnostics a difficult matter. The problems appear already at the stage of gathering diagnostic signals. The only practically accessible signals are the currents on secondary sides of current transformers monitoring supply currents of separate machines. Due to the proximity of other conductors, carrying high currents, these signals are sometimes accompanied by heavy background noise. The next stage of the diagnostic procedure is off-line analysis of registered signals referring to investigated objects. The main problem at this stage is proper interpretation of gotten results, especially in the cases where determination of the cage state, of investigated machines, is difficult due to ambiguity of diagnostic signals. The ambiguities and doubts by taking diagnostic decision result from that the diagnostic-like signal could be generated not only by cage damage but also by slightly asymmetrically manufactured rotor cage. In such difficult cases, the many-year diagnosing experience is the indispensable precondition for proper diagnostic verdict. The present paper includes some reports on case studies encountered during practical diagnoses of high power, 6kV induction machines, operated in real industrial conditions.

Słowa kluczowe

EN

current measurement; diagnostic expert system; induction machine; squirrel-cage motor

• Wydawca: AGH University of Science and Technology ; Lodz University of Technology
• Czasopismo: Electrical Power Quality and Utilisation. Journal
• Rocznik: 2008
• Tom: Vol. 14, iss. 1
• Strony: 79--84
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Dybowski P.

• AGH-University of Science and Technology, Poland

autor

Rams W.

autor

Rusek J.

Bibliografia

• 1. Rams W., Rusek J.: Praktyczna diagnostyka maszyn indukcyjnych klatkowych. In: Zeszyty Problemowe BOBRME KOMEL Nr 68/2004, Ustroń 2004, pp. 1–5.
• 2. Sobczyk T.J., Vas P., Tassoni C.: A comparative study of effects due to eccentricity and external stator and rotor asymmetries by monoharmonic models. In: ICEM’2000 Proceedings. Vol. II. Helsinki University of Technology. Espoo, Finland, pp. 946–950
• 3. Rusek J.: Reflection of eccentricities in spectral composition of currents of induction machines. In: ICEM’96 Proceedings. Vol. 2, ETSEM – Universidade de Vigo, Spain, pp. 470–475.
• 4. Dybowski P.: Pomiary i modelowanie prądowych symptomów uszkodzeń maszyn indukcyjnych. Ph.D. dissertation, EAIiE Dept., AGH Cracow 2001.
• 5. Dybowski P.: Influence Of Non-sinusoidal Voltage Supply On Harmonic Spectrum Of Stator Currents Of Induction Machines. In: Proc. 7th International Conference Electrical Power Quality and Utilisation, 2003, Cracow, pp.463–468.
• 6. Weinreb K., Węgiel T., Sułowicz M.: Nieinwazyjna diagnostyka wirnika maszyny asynchronicznej. In: Zeszyty Problemowe BOBRME KOMEL Nr 69/2004, Ustroń 2004, pp. 35–40