What is it about?
1. In order to improve the technical and economic performance of the CC as an insulating material, synthetic polymer film based on isotactic polypropylene, was used instead of paper impregnated with transformer or condenser oil. The dielectric system of a modern high-voltage short circuit consists of soft aluminum covers and a single layer of isopropylene film impregnated with oil. 2. 40% of the batch of capacitors of connection for a voltage class of 330 kV type СМА-166/√3-14 UHL1, (manufactured in 2008), in one of the power systems of Ukraine had poor insulation characteristics during the lifetime - 5 years, and their reliability indicators do not meet regulatory requirements and passport data.
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Why is it important?
The cause of the deterioration of the insulation characteristics of the capacitors is the factory defects: deformation of the polypropylene film due to the violation of the technology of winding of the capacitor sections, and the mismatch of the chemical resistance of the dielectric film to dissolution in the liquid dielectric
Perspectives
This interaction of components, which was investigated in detail, has a thermo activation nature, which relates to the processes of rearrangement of atoms or molecules with the overcoming of potential barriers, and is manifested in the swelling of the polypropylene film with subsequent dissolution of the amorphous component in the polymeric component. As a consequence, irreversible structural changes of the film occur, which lead to a decrease in its electrical and mechanical strength, as well as to an increase in the dielectric loss of the liquid dielectric.
Olena Rubanenko
University of West Bohemia
Read the Original
This page is a summary of: Dielectric properties analysis of paper capacitor, January 2020, American Institute of Physics,
DOI: 10.1063/5.0019831.
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