Temperature dependence of the resistance of modern epoxy mica insulation of HV rotating machines

This work presents the temperature dependence of the dielectric properties of two types of epoxy mica insulation systems. Polarization and depolarization currents, insulation resistance, capacitance and polarization index were measured over a temperature range of 20 to 100degC on whole rotating machine stator bars. An analytical relationship of the correction of the resistance as a function of temperature was derived from the experimental results.

[1]  Eric David,et al.  The use of time domain spectroscopy as a diagnostic tool for rotating machine windings , 2002, Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316).

[2]  A. Nair,et al.  Modeling of a generator I-V curve from the ramped direct voltage method , 2006, Conference Record of the 2006 IEEE International Symposium on Electrical Insulation.

[3]  E. David,et al.  Influence of rise time on dielectric parameters extracted from time domain spectroscopy in the context of generator stator insulation , 2005, IEEE Transactions on Dielectrics and Electrical Insulation.

[4]  H. Borsi,et al.  Dielectric response studies on insulating system of high voltage rotating machines , 2006, IEEE Transactions on Dielectrics and Electrical Insulation.

[5]  E. David,et al.  Low-frequency dielectric response of epoxy-mica insulated generator bars during multi-stress aging , 2007, IEEE Transactions on Dielectrics and Electrical Insulation.

[6]  E. David,et al.  Modeling of the low-frequency dielectric response of rotating machine stator insulation system , 2005, CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005..

[7]  A. Jonscher.  Dielectric relaxation in solids , 1983 .