Luminescence and space charge in polymeric dielectrics - [whitehead memorial lecture (2008)]

Polymers are extensively used as insulating material in high voltage devices, such as underground power cables, power capacitors and transformers. During normal operation the polymeric insulation of a power device is not only subjected to electrical stresses, but could also be subjected to other stresses that can cause the degradation and ultimately lead to insulation failure. It has been well established that electroluminescence and charge injection, which gives rise to space charge in the polymeric insulation, occur at ac, dc and impulse field above a certain threshold value. Space charge can cause dissipative energetic processes such as photon and phonon emission, increase the local electric field and reduce the withstand voltage of the insulation. This paper describes the characteristics of electroluminescence in polymeric insulation subjected to ac voltage and shows its relevance to space charge injection in the material. It is shown that insulation subjected to high voltage could emit various types of light but electroluminescence emission which is related to space charge injection can be clearly distinguished from these other types of light emission. The electroluminescence technique is a valuable tool to evaluate the dielectric properties of novel insulating materials, such as nanodielectrics.

[1]  J. Verdu,et al.  Chemiluminescence of hydrocarbon polymers , 1987 .

[2]  A. Bulinski,et al.  Spectra of electroluminescence in XLPE due to impulse voltage , 1998, 1998 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.98CH36257).

[3]  A. Bulinski,et al.  The effect of gas impregnation on the time to electrical tree inception in XLPE , 1992, Conference Record of the 1992 IEEE International Symposium on Electrical Insulation.

[4]  A. Bulinski,et al.  Light emission in XLPE subjected to HV in high vacuum and pressurized gas , 2001 .

[5]  I. Kitani,et al.  Very Faint Light Emission in Low-Density Polyethylene Films under dc Field , 1987 .

[6]  T. Lewis,et al.  The contribution of field-induced morphological change to the electrical aging and breakdown of polyethylene , 2005, IEEE Transactions on Dielectrics and Electrical Insulation.

[7]  P. Lewin,et al.  Phase resolved electroluminescence measurements in thin films of low density polyethylene using a charge coupled device camera , 2006, IEEE Transactions on Dielectrics and Electrical Insulation.

[8]  J. Bernasconi,et al.  High-Mobility States and Dielectric Breakdown in Polymeric Dielectrics , 1984, IEEE Transactions on Electrical Insulation.

[9]  J R Birch,et al.  Fifty categories of ordinate error in Fourier transform spectroscopy. , 1995 .

[10]  G. Teyssedre,et al.  From LDPE to XLPE: investigating the change of electrical properties. Part I. space charge, conduction and lifetime , 2005, IEEE Transactions on Dielectrics and Electrical Insulation.

[11]  Kenji Horii,et al.  The Space Charge Behavior and Luminescence Phenomena in Polymers at 77 K , 1979, IEEE Transactions on Electrical Insulation.

[12]  A. Bulinski,et al.  Luminescence and Space Charge in Polymeric Dielectrics , 2009 .

[13]  C. Laurent,et al.  Identification of the components of the electroluminescence spectrum of PE excited in uniform fields , 1999 .

[14]  Kotaro Kajikawa,et al.  Principles of Nano-Optics: Surface plasmons , 2006 .

[15]  C. Laurent,et al.  Optical pre-breakdown warnings in insulating polymers , 1998, ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132).

[16]  C. Laurent,et al.  Ac and dc electroluminescence in insulating polymers and implication for electrical ageing , 2001 .

[17]  T. Idehara,et al.  MEMOIRS OF THE FACULTY OF ENGINEERING , 1977 .

[18]  A. Bulinski,et al.  Thermoluminescence in XLPE cable insulation , 1996 .

[19]  S. Patai,et al.  The Chemistry of enones , 1989 .

[20]  C. Laurent,et al.  Electroluminescence from polyolefins subjected to a homogeneous ac field , 1995 .

[21]  A. Ishibashi,et al.  A study of treeing phenomena in the development of insulation for 500 kV XLPE cables , 1998 .

[22]  G. Teyssedre,et al.  From LDPE to XLPE: Investigating the change of electrical properties. Part II. luminescence , 2005, IEEE Transactions on Dielectrics and Electrical Insulation.

[23]  T. Lewis,et al.  Interfaces: nanometric dielectrics , 2005 .

[24]  A. Bulinski,et al.  Thermoluminescence - An optical technique for in-situ measurement of cross-linking by-products during degassing of power cables , 2007, IEEE Electrical Insulation Magazine.

[25]  S.S. Bamji,et al.  Simultaneous measurement of Electroluminescence and dissipation current in cable insulation , 2003, Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417).

[26]  T. Lewis.  Interfaces are the dominant feature of dielectrics at the nanometric level , 2004, IEEE Transactions on Dielectrics and Electrical Insulation.

[27]  S. Bamji,et al.  Phase-resolved pulsed electro-acoustic technique to detect space charge in solid dielectrics subjected to AC voltage , 2007, IEEE Transactions on Dielectrics and Electrical Insulation.

[28]  R. N. Hampton,et al.  Measurement of space charge in XLPE insulation under 50 Hz ac electric stresses using the LIPP method , 2002 .

[29]  G. Teyssedre,et al.  Charge transport modeling in insulating polymers: from molecular to macroscopic scale , 2005, IEEE Transactions on Dielectrics and Electrical Insulation.

[30]  A. Bulinski,et al.  Light and tree inception characteristics of XLPE at elevated temperatures , 1993, Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP '93).