Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1985-03-29
1986-11-11
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
29 2542, H01G 408, H01G 700
Patent
active
046226206
ABSTRACT:
An electric capacitor formed of dielectric layers provided on at least one side with metal layers with coatings, and wherein the layers are formed of partially crystallized and pre-shrunk polyethylene terephthalate. The coatings are alternately electrically conductively connected to metal layers applied by the Schoop process with opposing polarity to end faces of the capacitor body. The dielectric layers are arranged to form a stack or are deformed to form a flat-pressed winding. The polyethylene terephthalate dielectric layers have a degree of crystallization of at least 50%, in particular at least 55%, measured by differential thermo-analysis in order to determine the melting point enthalpy. In a method for production of such a capacitor, the capacitor bodies provided with the metal layers are subjected to an additional heat treatment in which the temperature is increased from room temperature to a final temperature of 200.degree. to 250.degree. C. for 1 to 5 hours. This final temperature is held for a period of 1 to 65 hours, where the length of this holding time is inversely proportional to the final temperature.
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IEEE Transactions on Electrical Insulation, vol. EI-15, No. 4, Aug. 1980, "Thermal Aging of Bi-Axially Oriented PET Films: Relation Between Structural Changes and Dielectric Behavior", by F. J. Morel et al., pp. 335-339.
Griffin Donald A.
Siemens Aktiengesellschaft
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