Dynamic behavior of surface charge distribution during partial discharge sequences

A surface charge measurement system based on Pockels effect was constructed to detect the variation of residual surface charge distribution in partial discharge (PD) sequences. The current form (ns level) of the PD sequence was measured simultaneously. By using this system, it is found that surface charge distribution caused by PDs appeared as several isolated charges spots similar to that in dielectric barrier discharges (DBD). The result also agrees with the previous models, suggesting that charge distribution is not uniform and that it plays an important role in the stochastic behavior of PDs. As the applied voltage increased, the number of charge spots increased and the hetero-discharge occurred. Besides, a charge ring along the void edge was observed after aging due to PD. An approximate linear relationship existed between PD magnitude and the corresponding accumulated surface charges. In the PD sequence, the discharges tended to take place at the sites having heterocharges at dielectric surface after voltage polarity reversed. Moreover, there were no homodischarges observed at the decreasing part of applied voltage even at the area without surface charges existing. This could not be explained by the accumulation of surface charges. It was also observed that more than one charge spot in one PD could occur. This was named simultaneous discharge in our paper, and may be attributed to the effects of photoionization and time lag.

[1]  T. Tanaka,et al.  Internal Partial Discharge and Material Degradation , 1986, IEEE Transactions on Electrical Insulation.

[2]  J. Devins,et al.  The 1984 J. B. Whitehead Memorial Lecture the Physics of Partial Discharges in Solid Dielectrics , 1984, IEEE Transactions on Electrical Insulation.

[3]  Simulation of partial discharge sequences using fluid equations , 2011 .

[4]  Gian Carlo Montanari,et al.  Advanced modeling of electron avalanche process in polymeric dielectric voids: Simulations and experimental validation , 2010 .

[5]  L. Niemeyer,et al.  The importance of statistical characteristics of partial discharge data , 1992 .

[6]  H. Kojima,et al.  Surface charge accumulation and partial discharge activity for small gaps of electrode/epoxy interface in sf6 gas , 2009, IEEE Transactions on Dielectrics and Electrical Insulation.

[7]  Simulation of PD patterns due to a narrow void in different E-field distribution , 2010 .

[8]  J. Lowke,et al.  Streamer propagation in air , 1997 .

[9]  Rainer Patsch,et al.  Pulse Sequence Analysis - a diagnostic tool based on the physics behind partial discharges , 2002 .

[10]  H. Purwins,et al.  Spatially resolved surface-charge measurement in a planar dielectric-barrier discharge system. , 2007, Physical review letters.

[11]  P.H.F. Morshuis,et al.  Partial discharge mechanisms: Mechanisms leading to breakdown, analyzed by fast electrical and optical measurements , 1993 .

[12]  M. G. Danikas,et al.  Partial Discharges in Ellipsoidal and Spheroidal Voids , 1991 .

[13]  T. Takada,et al.  ac surface discharge on dielectric materials observed by advanced Pockels effect technique , 1994 .

[14]  Hazlee Azil Illias,et al.  The influence of spherical cavity surface charge distribution on the sequence of partial discharge events , 2011 .

[15]  P.H.F. Morshuis,et al.  Degradation of solid dielectrics due to internal partial discharge: some thoughts on progress made and where to go now , 2005, IEEE Transactions on Dielectrics and Electrical Insulation.

[16]  R. J. Brunt,et al.  Stochastic properties of partial-discharge phenomena , 1991 .

[17]  M. Kanazashi,et al.  Degradation of Polyethylene by Partial Discharge , 1967, IEEE Transactions on Electrical Insulation.

[18]  R. Bartnikas,et al.  Effect of overvoltage on the risetime and amplitude of PD pulses , 1995 .

[19]  A. Fridman,et al.  Non-thermal atmospheric pressure discharges , 2005 .

[20]  N. L. Allen,et al.  The variation with temperature of positive streamer properties in air , 1995 .

[21]  Yasuo Suzuoki,et al.  Are partial discharges in artificial tubes chaotic? , 2003, Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417).

[22]  K. Aihara,et al.  Nonlinear dynamical study of partial discharge phenomena , 1999, Proceedings of 1999 IEEE 13th International Conference on Dielectric Liquids (ICDL'99) (Cat. No.99CH36213).

[23]  Changhao Sun,et al.  Study on the characteristics of partial discharges in voids under square voltage by detecting light emission intensity , 2011, IEEE Transactions on Dielectrics and Electrical Insulation.

[24]  W. Marsden.  I and J , 2012 .

[25]  Yasuo Suzuoki,et al.  PD characteristics as a stochastic process and its integral equation under sinusoidal voltage , 2001 .

[26]  T. Okamoto,et al.  Contribution of surface conductivity to the current forms of partial discharges in voids , 2005, IEEE Transactions on Dielectrics and Electrical Insulation.

[27]  Demin Tu,et al.  The dynamic measurement of surface charge distribution deposited from partial discharge in air by Pockels effect technique , 1996 .

[28]  J. Devins.  The physics of partial discharges in solid dielectrics , 1984, Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1984.

[29]  Yasuo Suzuoki,et al.  The contribution of discharge area variation to partial discharge patterns in disc-voids , 2004 .

[30]  R. Bartnikas,et al.  Spark-to-glow discharge transition due to increased surface conductivity on epoxy resin specimens , 1993 .

[31]  R. J. Van Brunt,et al.  Importance of unraveling memory propagation effects in interpreting data on partial discharge statistics , 1993 .

[32]  Hitoshi Okubo,et al.  The relationship between partial discharge current pulse waveforms and physical mechanisms , 2002 .

[33]  R. Bartnikas.  Some observations concerning the influence of dielectric surfaces upon the PD behavior , 2008, IEEE Transactions on Dielectrics and Electrical Insulation.

[34]  C. Cachin,et al.  PD recognition with knowledge-based preprocessing and neural networks , 1995 .

[35]  R. J. Van Brunt,et al.  Influence of memory propagation on phase‐resolved stochastic behavior of ac‐generated partial discharges , 1991 .