| 摘要 |
In a fluid-filled cable for service at 200 kV and upwards a low-viscosity naphthene-free mineral oil is used to impregante a paper/polypropylene/paper laminate. The polypropylene is selected for low solubility in the oil, and the paper has a density of 0.85Mg/m3 or less, an impermeability of at least 10,000 Gurley seconds, and a thickness, at least in the inner high-stress zone of the dielectric, of 50 micrometers or less, preferably 25 micrometers. |
