The values of the thermal resistivity of insulation are taken from standard IEC 60287-2-1 Ed.2.0 where available with the following additions:

- For the purposes of current rating calculations, the semiconducting screening materials are assumed to have the same thermal properties as the adjacent dielectric materials.
- Value for Polypropylene (PP) is taken from professionalplastics.com
- Value for Silicone rubber (SiR) is taken from shinetsusilicone-global.com

$\rho_{\mathrm{i}}$

K.m/W

$U_{\mathrm{n}}$

Cable rated voltage [kV]

$T_{\mathrm{1}}$

$T_{\mathrm{1t}}$

$X_{\mathrm{K}}$

Factor X_{K} [-]

Material | Value |
---|---|

PE | 3.5 |

HDPE | 3.5 |

XLPE | 3.5 |

XLPEf | 3.5 |

PVC | 5.0 (U_{n} <= 3kV)6.0 (U _{n} > 3kV) |

EPR | 3.5 (U_{n} <= 3kV)5.0 (U _{n} > 3kV) |

IIR | 5.0 |

PPLP | 5.5 |

Mass | 6.0 |

Oil | 5.0 |

PP | 4.5 |

SiR | 5.0 |

EVA | 4.35 |