Research and development of electrical insulation of superconducting cables by extruded polymers

Effect of temperature on space charge trapping and conduction in cross-linked polyethylene

“…CROSS-LINKED polyethylene (XLPE), with excellent electrical and mechanical properties, has become one of the most common dielectric insulation materials in power systems [1][2][3][4][5]. Extruded solid insulation based on XLPE has been successfully used for AC transmission and distribution cable insulation for above 50 years.…”

Electrical treeing in XLPE cable insulation at cryogenic temperature under harmonic AC voltages

“…It is observed that an intrinsic type or a fibrillar type tree form under AC/harmonic AC voltage. Kosaki et al observed that tree inception voltage in XLPE cable insulation, at low temperature, is much higher than the tree inception voltage at normal room temperature [7]. The tree pattern formed under 50 Hz have a thick main branch with fibrils at the edges.…”

“…Polymers have been used extensively in electrical insulation for cryogenic equipment because of their high mechanical strength with excellent electrical insulation characteristics [5][6][7]. Defect free manufacturing of polymer material for cryogenic power apparatus is one of the major challenges faced in insulation sectors [8,9].…”

Electric Power Infrastructure Reliability and Security (EPIRS) Reseach and Development Initiative

“…PMMA is used as an insulating medium over a wide range of temperatures (77 K to 350 K). It exhibits high dielectric strength of the order of 13.5 MV/cm at around 77 K decreasing to about 7.5 MV/cm at around 325 K [29]. BTA has a very high relative permittivity, which is very sensitive to temperature and frequency; in addition it varies widely depending on the direction of the electric field to its crystal axis.…”