PRYSMIAN GROUP | 525 kV HVDC Mass Impregnated Non Drained Technology Mass Impregnated Non Drained (MIND) cables are suitable for voltages of up to 600 kV DC. The insulation consists of high-density paper tapes impregnated with a high-viscosity compound which does not require fluid pressure feeding, thus allowing cables to be installed in HVDC links in very long lengths, up to several hundreds of kilometers. Nevertheless, they have intrinsic limitations in power given by kraft paper’s electrical and thermal performances. Research and development work on materials and technologies carried out by Prysmian over the years has led to a product that can operate up to 60°C and has the longest track record of operation at 525 kV voltage level. MIND cables are still of interest for all applications where thermal performances are limited by other factors or aren’t the main design driver, such as limitation of transmission losses, environmental constraints, or high depth applications. MAIN MIND TECHNOLOGY ADVANTAGES: PERFORMANCES: Largest track record and high reliability for 525 kV voltage level Field proven designs for high depth applications Competing solution for low transmission loss applications Operating temperature up to 60°C High electrical strength, capable to withstand polarity reversals and transient overvoltages Laboratory and Field proven capability for high water depths Prysmian’s special armour design enables record installation depths exceeding 2200 m, using special armour design features also developed by Prysmian. MIND cables are the only technology installed and in operation at 1600 m. For high depth applications, mechanical constraints reduce the crosssection disadvantage with extruded cables. The thin insulation package typically used in MIND cables is beneficial in reducing the cable weight and pulling tensions during installation. This doesn’t affect the current rating, as thermal conditions at high depths are more favorable thanks to lower temperatures and large distances between pole cables, not installed in bundle.
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