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

By John G. Webster (Editor)

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Another area involving a large change has been the introduction of segmented patterns which provide the basis for dry, self-protected capacitors. Examples of segmented patterns are shown in Fig. 9. The big commercial development has been the metallization of segmented patterns with highspeed manufacturing processes. Dielectric film coatings, used either as a substrate for the metallization layer or a protected coating on top of the metallization layer, have also been used during the past 10 years.

PP film capacitors have continued to evolve beyond the 1985 22 CAPACITOR INSULATION case, including, in some cases, the transition from foil construction to metallized electrode construction 5. 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.

001 1,000 10,000 100,000 1,000,000 sulting today in an image as a mature industry, that is, very Frequency (Hz) little change took place after 1985. During that 25-year period other polymer films have been used, such as polystyrene and Figure 6. The ESR of 400 V class MLP capacitors used for power supply output filters for good ripple attenuation and noise suppres- polycarbonate, but polypropylene and polyester remain the sion up into the multimegahertz frequency regime. The ESRs are gen- dominant films for metallized polymeric film capacitors.

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


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