The influence of morphology on the electrical breakdown strength of polypropylene film

Author

Gao, L.Y. ; Tu, D.M. ; Zhou, S.C. ; Zhang, Z.L.

Author_Institution

Dept. of Electr. Eng., Xi´´an Jiaotong Univ., China

Volume

25

Issue

3

fYear

1990

fDate

6/1/1990 12:00:00 AM

Firstpage

535

Lastpage

540

Abstract

The relationship between the microscopic structure morphology and the electrical strength of polypropylene (PP) film used in PP-laminated paper (PPLP) in very high voltage oil-filled cable is studied by several methods including infrared spectrum, X-ray diffraction and dynamic mechanical spectra. It is found that the key to improve the breakdown strength, the tensile strength and the stability in oil for PP film is to increase its structure parameters, namely, its crystallinity, orientation and molecular weight. The interaction between PPLP and liquid dielectric is also studied. It is found that when it is immersed in dodecyl benzene at 100°C, the strength of PP film decreases because the amorphous part dissolves and disorientation occurs

Keywords

cable insulation; electric breakdown of solids; electric strength; organic insulating materials; polymer films; 100 degC; PP-laminated paper; X-ray diffraction; breakdown strength; crystallinity; dodecyl benzene; dynamic mechanical spectra; electrical breakdown strength; infrared spectrum; liquid dielectric; microscopic structure morphology; molecular weight; orientation; polypropylene film; stability; tensile strength; very high voltage oil-filled cable; Dielectric liquids; Electric breakdown; Infrared spectra; Microscopy; Morphology; Oil filled cables; Petroleum; Stability; Voltage; X-ray diffraction;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.55728

Filename

55728