Advanced SearchSearch Tips
Cavity and Interface effect of PI-Film on Charge Accumulation and PD Activity under Bipolar Pulse Voltage
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Cavity and Interface effect of PI-Film on Charge Accumulation and PD Activity under Bipolar Pulse Voltage
Akram, Shakeel; Wu, Guangning; Gao, GuoQiang; Liu, Yang;
  PDF(new window)
With the continuous development in insulation of electrical equipment design, the reliability of the system has been enhanced. However, in the manufacturing process and during operation under continues stresses introduce local defects, such as voids between interfaces that can responsible to occurrence of partial discharge (PD), electric field distortion and accumulation of charges. These defects may lead to localize corrosion and material degradation of insulation system, and a serious threat to the equipment. A model of three layers of PI film with air gap is presented to understand the influence of interface and voids on exploitation conditions such as strong electrical field, PD activity and charge movement. The analytical analysis, and experimental results are good agreement and show that the lose contact between interfaces accumulate more residual charges and in consequences increase the electric field intensity and accelerates internal discharges. These residual charges are trapped charges, injected by the electrodes has often same polarity, so the electric field in cavities increases significantly and thus partial discharge inception voltage (PDIV) decreases. Contrary, number of PD discharge quantity increases due to interface. Interfacial polarization effect has opposite impact on electric field and PDIV as compare to void.
Partial discharge;Surface charge;Bipolar square pulse waveform;Polyimide film;Breakdown;Electric field distortion;
 Cited by
W. Yin, “Dielectric properties of an improved magnet wire for inverter-fed motors,” IEEE Elect. Insul. Mag., Vol. 13, No. 4, pp. 17-23, 1997.

S.U. Haq, S.H. Jayaram, and E.A. Cherney, “Insulation problems in medium voltage stator coils under fast repetitive voltage pulses,” IEEE Trans. Industry Appl.,Vol. 44, No. 4, pp. 1004-1012, 2008. crossref(new window)

L. Mascia and A. Kioul, “Influence of siloxane composition and morphology on properties of polyimidesilica hybrids”, Polymer, vol. 36, no. 19, pp. 3649-3659, 1995. crossref(new window)

IEC 60034-18-41: Rotating electrical machines - Part 18-41: Qualification and type tests for Type I electrical insulation systems used in rotating electrical machines fed from voltage converters, 2006.

IEC TS 60034-18-42: Rotating electrical machines - Part 18-42: Qualification and acceptance tests for partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters, 2008.

J. Robertson, O. Sharia, A. Demkov, “A Fermi level pinning by defects in HfO2-metal gate stacks”, Appl. Phys. Lett. 91:132912, 2007. crossref(new window)

G. Teyssedre, C. Laurent, “Charge transport modeling in insulating polymers: from molecular to macroscopic scale”, IEEE Trans. Dielect. Electr. Insul. Vol.12, No. 5, pp. 857-875, 2005. crossref(new window)

D. Arnold, E. Cartier, D. J. DiMaria “Theory of high-field electron transport and impact ionization insilicon dioxide”, Phys Rev B Vol. 49, pp. 10278-10297, 1994. crossref(new window)

L. Tong, G. Wu, and L. Xi, “Relationship of partial discharge and insulation life,” International Conferenceon Condition Monitoring and Diagnosis, pp.662-665, Changwon, Korea, 2-5 April 2006.

Cavallini, R. Ciani, M. Conti, P. F. H. Morshuis, and G. C. Montanari, "Modeling memory phenomena for partial discharge processes in insulation cavities," Annual Report Conference on Electrical Insulationand Dielectric Phenomena, pp. 723-727, 2003.

D. Fabiani, Accelerated degradation of ac-motor winding insulation due to voltage waveforms generated by adjustable speed drives, Ph.D. Thesis, University of Bologna, Bologna, Italy, 2002, published by Gedit Edizioni, Bologna, Italy, May 2003.

M. Takashima, K. Sda and T. Takada, ‘‘Measurement of electric charges at the interface between two dielectric layers using an electro-acoustic transducer technique’’, IEEE Trans. Electr. Insul., Vol. 23, pp.287_295, 1988. crossref(new window)

T. Jing, Surfac charge accumulation in SF6, Ph.D. Thesis, Delft University Press, Delft, The Netherlands, 1993.

IEC 62068-1. Evaluation of electrical stresses produced b repetitive impulses. Part 1: General methods of evaluation of electrical endurance. IEC 62068-1, 2003.

IEC 61934. Electrical insulating materials and systems— Electrical measurements of partial discharges during short rise time repetitive voltage impulses. IEC61934, 2006.

D. Fabiani, G. C. Montanari, and A.Contin, “Aging acceleration of insulating materials for electrical machine windings supplied by PWM in the presence and in the absence of partial discharges,” IEEE ICSD, pp. 283-286, Eindhoven, The Netherlands, 25-29 June 2001.

R. Bodega, P. H. F. Morshuis, M. Lazzaroni, and F. J. Wester, “PD recurrence in cavities at different energizingmethods,” IEEE Trans. Instrumentat. Measur.,Vol. 53, No. 2, pp. 251-258, 2004. crossref(new window)

K. Horie, T. Yamashita, Photosensitive Polyimides: Fundamentals and Applications; Technomic: 1995.

Luo Yang, Wu Guangning, Wang Peng, Zhang Yiqiang, Cao Kaijiang, Xu Huihui, Xin Zhengliang, “Effect of Temperature on Partial Discharge Properties of Polyimide Film Under Continuous Square Impulse Voltage”, Proceedings of the CSEE Vol.32 No.19, pp.154-160, Jul.5, 2012.