Mechanical Characteristics of an XLPE Cable and a Joint under High Temperature

Characteristics of crosslinked polyethylene used in XLPE cable change much over 100°C. Mechanical characteristics of crosslinked polyethylene insulated cables and tape lapped joints under high temperature condition were studied. A cleat doesn't change shape of a cable and short-circuit current and ground fault current don't damage a cable at about 105°C. On the other hand, at about 105°C, performance of water impervious layer degraded. Copper taps lapped shield are broken at an offset position with thermal expansion and contraction. Support force of a cleat decreases and lead tape lapped shield is broken.