What type of insulation is used for medium-voltage insulated conductors?

Cross-linked polyethylene (XLPE) is used for medium-voltage insulated conductors primarily due to its excellent electrical properties, thermal stability, and resistance to environmental stressors. XLPE insulation can withstand higher temperatures and operates effectively at voltages typically in the range of 1 kV to 35 kV, making it suitable for a variety of applications in power distribution. Its cross-linked structure provides improved mechanical strength and resistance to electrical breakdown, which are critical factors for ensuring safe and reliable operation in medium-voltage systems.

Additionally, XLPE has a low water absorption rate, contributing to its durability and longevity in the field. This makes it particularly advantageous for underground and direct burial applications. This insulation type also exhibits good chemical resistance, which helps it perform well in environments where exposure to oils, solvents, and other chemicals might be a concern.