By John G. Webster (Editor)

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Very high peak power energy-discharge capacitors progressing from foil/paper construction to metallized kraft/ film construction. 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.

The resultant electrical energy of this charged system is stored in the polarized insulating medium and the physically separated surface charges on the electrodes. Capacitors permit storing electrical energy over a long charging time and then release it as required over very short (submicroseconds to multimilliseconds) periods under controlled conditions (4,18). Such energy discharge operation, as with filtering duty, requires device technology of very high efficiency per unit volume/mass to minimize thermal management constraints on the system designer, as summarized in Table 1 (4,7,14,15).

Problems of sealing common to all electrolyte capacitors were eliminated with this approach. Conventional hermetic sealing was now possible with the elimination of the liquid electrolyte solution. The construction of the tantalum capacitor utilizes a very porous anode built with tantalum powder. The powder is pressed in a pellet form with a tantalum wire inserted (Fig. 15). Then the pellet is sintered to allow contact growth among all individual particles (Fig. 16). The result is a porous block that electrically connects all tantalum particles to each other and to the tantalum wire.

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


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