Title :
DC characteristics of cable insulating materials
Author :
Suzuki, T. ; Katakai, S. ; Kanaoka, M. ; Sekii, Y.
Author_Institution :
Tokyo Electr. Power Co. Inc., Tokyo, Japan
Abstract :
The insulation performance of PE (polyethylene) under DC voltage was investigated using sheet samples and miniature cables. Pressed sheets of various kinds of PE, which differed in material density and polymerization process, were prepared, and their thermally stimulated current and breakdown strength were measured. To confirm that insulating properties obtained in the experiments using sheet samples can also be obtained in thicker samples, experiments were conducted using miniature cables with 3.5-mm insulation thickness and a conductor cross-sectional area of 60 mm2 to evaluate breakdown strength and to measure the thermally stimulated current. Both sets of results showed that HDPE (high-density PE) has excellent insulating properties under DC voltage. The breakdown strength is high and the space charge accumulation is small. These properties of HDPE are considered to be due to its molecular structure, with its short lengths of molecular branches
Keywords :
cable insulation; electric breakdown of solids; insulation testing; organic insulating materials; polymers; thermally stimulated currents; 3.5 mm; DC voltage; HDPE; breakdown strength; high density polyethylene; insulation performance; insulation thickness; material density; miniature cables; molecular branches; molecular structure; polymerization process; space charge accumulation; thermally stimulated current; Cable insulation; Cables; Conducting materials; Current measurement; Density measurement; Electric breakdown; Polyethylene; Polymers; Sheet materials; Voltage;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1989., Proceedings of the 3rd International Conference on
Conference_Location :
Trondheim
DOI :
10.1109/ICSD.1989.69163
