XLPE materials for extruded high/extra-high voltage transmission cables

Abstract

High quality high voltage and extra-high voltage extruded dielectric transmission cables can be made with the use of appropriate insulation and semiconductive materials and with special processing equipment. The requirements for the cleanliness of the insulation products are defined. The methods required to produce, test and maintain high levels of cleanliness are also elucidated. The criticality of the smoothness of the semiconductive conductor shields is described and the methods used for producing and testing these shields are also explained. Cable data showing excellent transmission properties for these extruded dielectric cables are presented.

Superiority of partial discharge characteristics of cross‐linked polyethylene nanocomposites over microcomposites for electrical insulation application

“…In recent years, XLPE is considered as a suitable insulation for high voltage (HV) and extra HV power transmission. XLPE presents properties such as higher operating temperature (90°C), high mechanical strength, flexibility, low cost and easy processing compared with PE [7–9]. Hence, the dielectric properties of XLPE nanocomposites will be the major area to be analysed in coming days.…”

Evolution of medium voltage extruded cable technology in north america

“…The improvements in smoothness for conventional shields and the further improvement offered by supersmooth shields is shown in Figure 2. Accelerated aging tests confirm that the improvements in smoothness and cleanliness result in improved cable performance [7], as seen in Figure 3. …”

Lifetime estimation and diagnosis of XLPE used in HV insulation cables under thermal ageing: arithmetic sequences optimised by genetic algorithms approach

“…This excellent insulation material, commonly used in high-voltage cables, is characterised by a very high dielectric strength and low dielectric losses. Despite the excellent mechanical and electrical properties of low-density PE, its thermal behaviour at high temperature and its thermoplastic character limit rather its use especially with the development of new 500 kV cables technology [2][3][4][5]. The use of cross-linked polyethylene (XLPE) overcomes this handicap of PE and maintains its excellent mechanical and electrical properties at high temperatures.…”