By John G. Webster (Editor)
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Extra resources for 17.Dielectrics and Electrical Insulation
18–21). CAPACITOR INSULATION 17 Table 3. 05 5/50 k Ͼ100 M Capacitor System Mica Rep-Rate Hz Main Issues • New polymer films • Impregnants • Foils and conductors • Ͼ200ЊC • ӷ1 kJ/unit • Voltage reversal • Pulse duration • Repetition rate • Surface mount—solder reflow stability • Ceramic formulations • Electrodes • Ͼ300ЊC • 1 kJ/unit • Voltage scaling • Fusing • Electrolytes • Separators • Ͼ200ЊC • 1 kJ/unit • Gassing • Hermetic sealing • Voltage reversal • Pulse repetition rate • Electrodes • Ͼ400ЊC • 1 kJ/unit • Voltage scaling/reversal • Materials • Impregnants a Projects near term and future performance of state-of-the-art capacitor technology and shows selected examples of several classes of advanced capacitors that R&D could turn into future practical, highly compact systems.
High-frequency ac capacitors progressing from foil liquid-impregnated construction to metallized dry construction 6. 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.
Short-term ac duty. CAPACITOR INSULATION circuit’s critical stress point. More attention must now be paid to the filter components and in particular to the filter capacitors that must operate at very high ripple and load currents relative to their small size. Like any electrical/electronic component, all capacitor technologies have potential wear-out and failure mechanisms which depend on voltage, frequency, temperature, and time. When dramatically increasing any one of these parameters (such as the frequency), much more care must be taken in choosing the proper component for the application.
17.Dielectrics and Electrical Insulation by John G. Webster (Editor)