Life comparison of enamelled wires for inverter-fed motors

• Autorzy: Fabiani D. , Montanari G. C.
• Konferencja: II International Conference on Advances in Processing, Testing and Application of Dielectric Materials, 15-17 September, Wrocław 2004
• Języki publikacji: EN

Abstrakty

EN

This paper presents life test results obtained on twisted pair specimens, that are insulated by three different corona resistant and one conventional polyamide-imide materials, subjected to sinusoidal and square waveforms at supply and high frequencies. Life reduction as frequency increases is discussed both in the presence and in the absence of partial discharges. Life tests showed a strong dependence of life on peak-to-peak voltage and pulse repetition frequency. These results indicate that high frequency waveforms are able to affect severely conventional enamel insulation, while CR wires can provide longer lives depending on materials. It is observed that ageing acceleration under high-frequency pulses occurs even in the absence of partial discharges and in this condition failure times follow a rule roughly proportional to the ratio of test to supply frequency. Under partial discharge regime, breakdown is much more accelerated, and failure times follow a superlinear law as function of frequency.

Słowa kluczowe

EN

enamelled wire; adjustable speed drive; insulation degradation; voltage endurance

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2004
• Tom: Vol. 40, nr 15
• Strony: 192--193
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Fabiani D.

• LIMAT - DIE University of Bologna, Viale Risorgimento, 2, 1-40136 Bologna (Italy)

autor

Montanari G. C.

• LIMAT - DIE University of Bologna, Viale Risorgimento, 2, 1-40136 Bologna (Italy)

Bibliografia

• [1] FOULON N., LUCAS J.P., BARRÉ G., MAILFERT R. and ENON J., Investigation of the Failure Mechanism of Insulation Subjected to Repetitive Fast Voltage Surges, IEEE EIC and EMCW, Rosemont, IL (USA), September 1997, pp. 401-406.
• [2] OLIVER J.A. and STONE G.C., Implications for the Application of Adjustable Speed Drive Electronics to Motor Stator Winding Insulation, IEEE Electr. Instil. Mag., Vol. 11, n. 4, pp. 32-36, July 1995.
• [3] YIN W., Failure Mechanism of Winding Insulation in Inverter-Fed Motors, IEEE Electr. Insul. Mag., Vol. 13, n. 6, pp.18-23, November 1997.
• [4] BAUER K., KAUFHOLD M. and WANG H., High Voltage Motor Winding Insulation for High Power Adjustable Speed Drives Fed by IGBT-Converter, 8th BEAMA ’98, pp.257-263, Harrogate, UK, May 1998.
• [5] LEBEY T., CASTELAN P., MONTANARI G.C. and GHINELLO I., Influence of PWM Type Voltage Waveforms on Reliability of Machine Insulation Systems, IEEE ICHQP Athens, Greece, September 1998, pp. 994-998
• [6] FABIANI D. and MONTANARI G.C., The Effect of Voltage Distortion on Ageing Acceleration of Insulation Systems under Partial Discharge Activity, IEEE Electr. Insul. Mag., Vol. 17, n. 3, pp. 24-33, May 2001.
• [7] IEC Std. 62068: Evaluation of Electrical Stresses Produced by Repetitive Impulses. Part 1: General Methods of Evaluation of Electrical Endurance (IEC 98-160 CDV). Part 2: State of the Art Report (62068-2 (2001-08)).
• [8] FABIANI D., Accelerated degradation of ac-motor winding insulation due to voltage waveforms generated by adjustable speed drives, Ph.D Thesis, University of Bologna, published by Gedit Edizioni, Bologna, Italy, May 2003.