Influence of rise time on partial discharge extinction voltage at semi-square voltage waveforms

This work presents measurements of the partial discharge (PD) extinction voltage in three different types of test objects, using semi-square voltages with 2 ¿s and 100 ¿s rise time. A needle creating corona discharges, a twisted pair specimen commonly used for testing motor insulation and a paper/oil test object modelling the turn-to-turn insulation of a transformer winding were investigated, presenting extinction voltages between approximately 1 kV and 8 kV. For the twisted pair specimen the PD extinction voltage was significantly lower at the shorter rise time, whereas for the other test objects, just a small or no difference could be detected. The conclusion is that depending on what range of rise times and what insulation system that are studied, there may be an influence of the rise time of the applied voltage on the PD extinction voltage.

[1]  D. Fabiani,et al.  Relation between space charge accumulation and partial discharge activity in enameled wires under PWM-like voltage waveforms , 2004, IEEE Transactions on Dielectrics and Electrical Insulation.

[2]  Davide Fabiani,et al.  The effect of voltage distortion on ageing acceleration of insulation systems under partial discharge activity , 2001 .

[3]  Masayuki Hatano,et al.  Dielectric strength of transformer insulation at DC polarity reversal , 1997 .

[4]  T. Bengtsson,et al.  Measurement of partial discharges at rapidly changing voltages , 2008, IEEE Transactions on Dielectrics and Electrical Insulation.

[5]  M. Hikita,et al.  PDIV characteristics of twisted-pair of magnet wires with repetitive impulse voltage , 2007, IEEE Transactions on Dielectrics and Electrical Insulation.

[6]  Guangning Wu,et al.  New tools to determine the partial discharges of inverter fed motor , 2004, Proceedings of the 2004 IEEE International Conference on Solid Dielectrics, 2004. ICSD 2004..

[7]  H. Okubo,et al.  Technical Development on Partial Discharge Measurement and Electrical Insulation Techniques for Low Voltage Motors Driven by Voltage Inverters , 2007, IEEE Transactions on Dielectrics and Electrical Insulation.

[8]  M. Pompili,et al.  PD pulse burst characteristics of transformer oils , 2006, IEEE Transactions on Power Delivery.

[9]  G. C. Stone,et al.  Examples of stator winding partial discharge due to inverter drives , 2000, Conference Record of the 2000 IEEE International Symposium on Electrical Insulation (Cat. No.00CH37075).

[10]  F. Guastavino,et al.  Partial discharge activity in presence of pulsed waveforms , 2008, Conference Record of the 2008 IEEE International Symposium on Electrical Insulation.

[11]  Matthias Berth,et al.  Electrical stress and failure mechanism of the winding insulation in PWM-inverter-fed low-voltage induction motors , 2000, IEEE Trans. Ind. Electron..

[12]  Naoki Hayakawa,et al.  Partial discharge characteristics of inverter-fed motor coil samples under ac and surge voltage conditions , 2003, 2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena.

[13]  F. Guastavino,et al.  A study about partial discharge measurements performed applying to insulating systems square voltages with different rise times , 2005, CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005..

[14]  M. Hikita,et al.  RPDIV/RPDEV characteristics of twisted-pair under repetitive bipolar impulse condition , 2007, 2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena.

[16]  S. Halen,et al.  High-frequency impacts in a converter-based back-to-back tie; the Eagle Pass installation , 2003 .

[17]  Shigemitsu Okabe,et al.  Dielectric characteristics of oil-filled transformer insulation models under non-standard lightning impulse voltages , 1999 .

[18]  G. C. Stone,et al.  Progress in understanding the nature of PD in stators created by inverter drives , 2003, Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Technology Conference (Cat. No.03CH37480).