Changes of thermoplastic PE cable insulation properties caused by the overload current

Author

Grzybowski, S. ; Zubielik, P. ; Kuffel, E.

Author_Institution

Dept. of Electr. Eng., Mississippi State Univ., Mississippi State, MS, USA

Volume

4

Issue

3

fYear

1989

fDate

7/1/1989 12:00:00 AM

Firstpage

1507

Lastpage

1512

Abstract

Experiments were conducted to determine structural changes (degree of crystallinity) of PE (polyethylene), the development of treeing (velocity, shape), and changes of tan δ and breakdown strength as a result of thermal aging. The results show that thermal aging causes increased separation of spherulites. Overheating leads to the appearance of amorphous regions with dimensions exceeding the diameter of the neighboring spherulites. It is shown that the treeing channels develop faster in amorphous thermoplastic PE insulation than in a partially crystalline one and that tan δ increases, but the breakdown decreases with the time of thermal aging

Keywords

ageing; cable insulation; electric breakdown of solids; insulation testing; polymers; power cables; breakdown strength; degree of crystallinity; electric breakdown; insulation testing; overload current; polyethylene; power cables; spherulites; tan δ; thermal aging; treeing; Aging; Cable insulation; Cables; Crystallization; Electric breakdown; Morphology; Polyethylene; Temperature; Trees - insulation; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.32637

Filename

32637