| 摘要 |
A transmission cable includes a conductor or a bundle of conductors extending along a longitudinal axis, which is circumferentially covered by an insulation layer having an extruded insulation material, whereby the transmission cable passes the electrical type test as specified in Cigré TB496, whereby the rated voltage U0 is 450 kV or more. The type test includes subjecting the power cable to a DC voltage of 1.85*U0 during 10 to 15 cycles at negative polarity, followed by a polarity reversal with another 10 to 15 cycles at positive polarity at a DC voltage of 1.85*U0, followed by additional 2 to 5 cycles during at least 4 to 10 days at positive polarity, and wherein U0 is 450 kV, or 525 kV, or more. |
| 主权项 |
1. A transmission cable comprises a conductor or a bundle of conductors extending along a longitudinal axis, which is circumferentially covered by an insulation layer comprising an extruded insulation material, wherein the extruded insulation material comprises a crosslinked polymer composition, which is obtained by crosslinking a polymer composition, which polymer comprises a polyolefin, peroxide and sulphur containing antioxidant, wherein the crosslinked polymer composition has an Oxidation Induction Time, determined according to ASTM-D3895, ISO/CD 11357 and EN 728 using a Differential Scanning Calorimeter (DSC), which Oxidation Induction Time corresponds to Z minutes, and comprises an amount of peroxide by-products which corresponds to W ppm determined according to BTM2222 using HPLC, wherein
Z1≦Z≦Z2, W1≦W≦W2, and W≦p−270*Z, wherein Z1 is 0, Z2 is 60, W1 is 0 and W2 is 9500, and p is 18500 and wherein the crosslinked polymer composition does not comprise 2,4-diphenyl-4-methyl-1-pentene and whereby the transmission cable passes the electrical type test as specified in Cigré TB496, whereby the rated voltage U0 is 450 kV, or more. |
