Lifetime Improvement of Metallized Film Capacitors by Inner Pressure Strengthening

Metallized polypropylene film capacitors (MPPFCs) are widely used in pulse power systems for their characteristics of high reliabilities, high energy densities, and excellent pulse power handling capabilities. The teardown showed that the capacitance loss decreased gradually from the outer layers to the inner layers in a cylindrical MPPFC winding. This paper concentrates on the inner pressure in the MPPFC winding. First, the effects of the inner pressure on the self-healing and the lifetime are investigated. The lifetime can be extended by the inner pressure strengthening. Second, an inner pressure calculation formula is presented. The effects of the heat treatment and wrapped film on the pressure are considered. In addition, the heat treatment and wrapped films are chosen to strengthen the pressure. Finally, the experiments are designed to validate the effect of the lifetime improvement by the methods of the inner pressure strengthening. Results show that the lifetime can be extended by 30% with rational heat treatment and by 38% with rational design of the wrapped film.

[1]  G. Picci,et al.  Status quo and future prospects for metallized polypropylene energy storage capacitors , 2001, PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pulsed Power Conference. Digest of Papers (Cat. No.01CH37251).

[2]  Lin Fuchang,et al.  Study on Metallized Film Capacitor and its Voltage Maintaining Performance , 2008 .

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

[4]  Fuchang Lin,et al.  Effect of interlayer air on performance of dry-type metalized film capacitor in DC, AC and pulsed applications , 2011, IEEE Transactions on Dielectrics and Electrical Insulation.

[5]  Heqing Zhong,et al.  Study on Metallized Film Capacitor and its Voltage Maintaining Performance , 2008, 2008 14th Symposium on Electromagnetic Launch Technology.

[6]  Frederick J. Bueche,et al.  Capacitors , 2018, Introductory Electrical Engineering with Math Explained in Accessible Language.

[7]  T. R. Jow,et al.  High field conduction in biaxially oriented polypropylene at elevated temperature , 2012, IEEE Transactions on Dielectrics and Electrical Insulation.

[8]  D. Shaw,et al.  A Changing Capacitor Technology - Failure Mechanisms and Design Innovations , 1981, IEEE Transactions on Electrical Insulation.

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

[10]  Fuchang Lin,et al.  Calculation and measurement of metalized film capacitor's inner pressure and its influence on self-healing characteristics , 2010, IEEE Transactions on Dielectrics and Electrical Insulation.

[11]  Fuchang Lin,et al.  Study on self-healing and lifetime characteristics of metallized film capacitor under high electric field , 2011 .

[12]  Fuchang Lin,et al.  The capacitance loss mechanism of metallized film capacitor under pulsed discharge condition , 2011, IEEE Transactions on Dielectrics and Electrical Insulation.