Study of temperature rise of metallized capacitors applied in repetitive pulse

When metallized capacitors are applied to pulsed power applications with frequency less than 1 Hz, heat induced by current can be ignored. However, it is necessary to consider the accumulation effect of heat on temperature rise of capacitors which are applied to repetitive pulsed systems. The paper mainly study the influence of frequency and line current density on temperature rise of metallized capacitors applied to repetitive pulsed systems. The experiment results show that temperature increases with line current density and frequency increasing, and when surface temperature of capacitor is higher than 110degC, the melted PP film would blow out from the middle location of capacitors, and the highest temperature in the capacitor is calculated. The capacitor segment location and line current density on the single discharge energy of the capacitor are influenced and has been analyzed by ATP. Temperature rise of each segment location of capacitor caused by single discharge was calculated, the results show that temperature rise is very small.

[1]  M.G. Kong,et al.  Temporal evolution of electric field distribution and energy dissipation in a metallized polymer film capacitor under DC, AC or nonsinusoidal voltage stresses , 2000, 2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132).

[2]  P. J. Phillips,et al.  The electrically ruptured area of crosslinked polyethylene , 1991 .

[3]  André Denat,et al.  Self-healing of capacitors with metallized film technology:: experimental observations and theoretical model , 2001 .

[4]  J. P. Hartnett,et al.  Advances in Heat Transfer , 2003 .

[5]  W. J. Sarjeant,et al.  Energy storage capacitors: aging, and diagnostic approaches for life validation , 1997 .

[6]  A. Gadoum,et al.  Accelerated AC degradation of impregnated PP films , 1995, IEEE Transactions on Dielectrics and Electrical Insulation.

[7]  J. Vogt,et al.  Breakdown behavior of oil-impregnated polypropylene as dielectric in film capacitors , 1998 .

[8]  J. L. Nash.  Biaxially oriented polypropylene film in power capacitors , 1988 .

[9]  C. Reed,et al.  The fundamentals of aging in HV polymer-film capacitors , 1994 .

[11]  J. Ho,et al.  Implications of Advanced Capacitor Dielectrics for Performance of Metallized Film Capacitor Windings , 2008, 2008 IEEE International Power Modulators and High-Voltage Conference.

[12]  V. K. Agarwal,et al.  Aging of multistressed polymeric insulators , 1989 .

[13]  R. Gallay,et al.  Temperature-dependent dielectric breakdown strength of oil impregnated polypropylene foils , 1998 .