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17.Dielectrics and Electrical Insulation by John G. Webster (Editor) PDF

By John G. Webster (Editor)

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Extra resources for 17.Dielectrics and Electrical Insulation

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In the dry tantalum capacitor, the counterelectrode ma- Pressed pellet - tantalum in chance contact, most not in contact Tantalum wire Tantalum particles Die cavity volume Figure 15. Tantalum capacitor pellet construction at the pressing stage during fabrication. 28 CAPACITOR INSULATION Sintered pellet - all tantalum in electrical contact Tantalum wire Tantalum particles Die cavity volume Figure 16. Sintered tantalum capacitor pellet after high temperature processing. terial is MnO2, and it is formed in successive dip and dry processes.

The power source developers of the future may well find that working together in this materials technology arena will enable a systems-responsive technology development program in each of the major capacitor technology areas. This would result in demonstration subscale hardware that will operate at the power and energy densities needed, being no smaller than tenth-scale in unit capacitance (4–9). An example of the projected increase in energy density of electrostatic and electrochemical capacitors for use in switched-mode power supplies is illustrated in the trend plot of Figure 2 (2,8,13–15).

Discussion of Examples Self-Protected Motor Run Capacitors. Line-frequency motor run capacitors require both long service life and fault protection. Over the years, this required a liquid-filled metal case capacitor incorporating a pressure interrupter. By 1985, this technology began to be replaced above the 200 Vac level with a plastic case, liquid-filled capacitor incorporating a pressure interrupter molded into the cover, and below the 440 Vac level with dry-potted, segmented metallized film construction.

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17.Dielectrics and Electrical Insulation by John G. Webster (Editor)

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