Calibration of pulsed electroacoustic method considering electrode–dielectric interface status and porosity

Pulsed electroacoustic (PEA) method is widely used, but measurement conditions not always agree with the underlying PEA assumptions. This necessitates space charge recovery; however, existing research only addresses the attenuation and dispersion in lossy media. The effects of electrode–dielectric interface contact status and porosity on the accuracy of space charge distribution are discussed in the present article. It is shown that the presence of nonlinear interface and porosity can introduce severe error. However, because the properties of acoustic propagation of waves (which are generated from charge on the electrode and in the bulk) are different, the conventional recovery algorithm is no longer suitable for calibrating the charge density. To obtain accurate space charge profiles, it is necessary to eliminate these effects. A method has been proposed which is based on the original measurement process. The validity of the proposed method was tested by reasonable post-recovery electric field distributions.

[1]  Ming Dong,et al.  Novel characteristic parameters for oil-paper insulation assessment from differential time-domain spectroscopy based on polarization and depolarization current measurement , 2011, IEEE Transactions on Dielectrics and Electrical Insulation.

[2]  J. Richardson,et al.  Harmonic generation at an unbonded interface—I. Planar interface between semi-infinite elastic media , 1979 .

[3]  S. Holé.  Resolution of direct space charge distribution measurement methods , 2008, IEEE Transactions on Dielectrics and Electrical Insulation.

[4]  Space charge measurement using pulsed electroacoustic technique and signal recovery , 1999 .

[5]  Yi Yin,et al.  Dielectric properties and effect of electrical aging on space charge accumulation in polyimide/TiO2 nanocomposite films , 2010 .

[6]  Weiyun Chen,et al.  Propagation of plane P-waves at interface between elastic solid and unsaturated poroelastic medium , 2012 .

[7]  Ying Li,et al.  Pulsed electroacoustic method for measurement of charge accumulation in solid dielectrics , 1994 .

[8]  G. Chen,et al.  On the space charge and DC breakdown behavior of polyethylene/silica nanocomposites , 2014, IEEE Transactions on Dielectrics and Electrical Insulation.

[9]  Inverse problem of electro-seismic conversion , 2013, 1303.2135.

[10]  E. Neagu.  Use of the final thermally stimulated discharge current technique to analyze space charge behavior in dielectrics , 2003 .

[11]  Gordon Wilson,et al.  Space charge behaviour in thick oil-impregnated pressboard under HVDC stresses , 2013, 2013 IEEE International Conference on Solid Dielectrics (ICSD).

[12]  P.H.F. Morshuis,et al.  Space charge measurements on impregnated paper: a review of the PEA method and a discussion of results , 1997 .

[13]  R. Ciobanu,et al.  Evaluation via PEA measurements of paper-oil insulation submitted to gamma radiation , 2008, 2008 International Conference on Condition Monitoring and Diagnosis.

[14]  Meng Huang,et al.  Influence of voltage reversal on space charge behavior in oil-paper insulation , 2014, IEEE Transactions on Dielectrics and Electrical Insulation.

[15]  J. Smit,et al.  Assessment of space charge behavior of oil-cellulose insulation systems by means of the PEA method , 2013, 2013 IEEE International Conference on Solid Dielectrics (ICSD).

[16]  R. Bartnikas.  Performance characteristics of dielectrics in the presence of space charge , 1997 .

[17]  Stéphane Holé,et al.  Space charge behaviour in epoxy laminates under high constant electric field , 2005 .

[18]  G. Mazzanti,et al.  Electrical aging and life models: the role of space charge , 2005, IEEE Transactions on Dielectrics and Electrical Insulation.

[19]  Yuanxiang Zhou,et al.  The influence of pre-stressing on breakdown characteristics in liquid silicone rubber , 2009 .

[20]  Nobutada Ohno,et al.  On the Acoustic Nonlinearity of Solid-Solid Contact With Pressure-Dependent Interface Stiffness , 2004 .

[21]  T. Takada,et al.  Measurement of Electric Fields at a Dielectric/Electrode Interface Using an Acoustic Transducer Technique , 1983, IEEE Transactions on Electrical Insulation.

[22]  M. Biot.  Theory of Propagation of Elastic Waves in a Fluid‐Saturated Porous Solid. I. Low‐Frequency Range , 1956 .

[23]  T. Takada,et al.  SPACE CHARGE MEASUREMENT IN THICK DIELECTRIC MATERIALS BY PULSED ELECTROACOUSTIC METHOD , 1995 .

[24]  Y. L. Chong,et al.  Space charge and charge trapping characteristics of cross-linked polyethylene subjected to ac electric stresses , 2006 .

[25]  Hai-Bao Mu,et al.  Effects of paper-aged state on space charge characteristics in oil-impregnated paper insulation , 2012, IEEE Transactions on Dielectrics and Electrical Insulation.

[26]  J. Marat-Mendes,et al.  Electrical conduction and space charge trapping in highly insulating materials , 2004 .

[27]  K. Johnson.  Contact Mechanics: Frontmatter , 1985 .

[28]  M. Biot.  Theory of Propagation of Elastic Waves in a Fluid-Saturated Porous Solid. II. Higher Frequency Range , 1956 .

[29]  Lijun Yang,et al.  Influence of moisture on space charge dynamics in multilayer oil-paper insulation , 2012, IEEE Transactions on Dielectrics and Electrical Insulation.