Development of the new polymer insulating materials for HVDC cable

Author

Yoshifuji, N. ; Niwa, T. ; Takahashi, Tatsuro ; Miyata, H.

Author_Institution

Tokyo Electric Power Co. Inc., Japan

Volume

7

Issue

3

fYear

1992

fDate

7/1/1992 12:00:00 AM

Firstpage

1053

Lastpage

1059

Abstract

The properties of modified HDPE, selected from various polymer materials by evaluations of DC characteristics, were examined in both sheet and cable samples. It was found that the modification, which introduced a small amount of polar group into HDPE, considerably enhanced DC breakdown strength to as high as 1.5-2.0 times those of XLPE (cross-linked polyethylene). Under a poling voltage of up to 30 kV/mm, the modified HDPE exhibits particular behavior, with its space charge decreasing as stress is increasing. In addition, the additives in HDPE have a large influence on space-charge characteristics, thereby affecting the DC breakdown strength. The evaluation of cable insulated with optimum modified HDPE was conducted to determine the breakdown strength under various voltage applications. Compared with the XLPE cable, modified HDPE cable exhibited excellent characteristics under all kinds of voltage applications, particularly DC dielectric breakdown strength, which was almost twice that of XLPE

Keywords

cable insulation; electric breakdown of solids; electric strength; organic insulating materials; polymers; power cables; DC breakdown strength; DC characteristics; HVDC cable; high density polyethylene; modified HDPE; poling voltage; polymer insulating materials; space charge; stress; Breakdown voltage; Cable insulation; Electric breakdown; HVDC transmission; Plastic insulation; Polyethylene; Polymers; Sheet materials; Space charge; Stress;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.141811

Filename

141811