Characterization of composite organic materials for field stresscontrol of HV cables terminations

摘要

Results are presented concerning the characterization of bothnelectrical properties (volume resistivity, permittivity, tan δ)nand mechanical properties (mass density, tensile strength, elongation,netc.) of cross-linked polyolefin stress control tubes (SCT). The authorsnalso examine the chemical compatibility of such materials with thenimpregnation oil used in paper impregnated cables; results concerningnthe above properties obtained after an accelerated aging test in oil atn100° C, according to ASTM D471/2, are reported. In order to correlatenthe behavior of materials with that of components, partial dischargencharacteristics and impulse withstand voltages for extruded cablenterminations manufactured with unaged and 4-th oil aged SCT are compared