A DIELECTRIC GELLING COMPOSITION A METHOD OF MANUFACTURING SUCH A DIELECTRIC GELLING COMPOSITION AND AN ELECTRIC DC-CABLE COMPRISING AN INSULATION SYSTEM IMPREGNATED WITH SUCH A DIELECTRIC GELLING COMPOSITION

摘要

In the transition temperature heat-reversible liquid - there is a dielectric gelling mixture disclosed showing the gel transition, the gel having a block copolymer including a block with a basis of at least one additional block and olefins, including aromatic rings in its backbone structure including gelatinase emitter and oil, and wherein each of the two blocks has at least 3000 g / mole molecular weight, a block having aromatic rings in the backbone of their structure shows a temperature dependent solubility in the rigid backbone structure and oil. The gelled mixture is then is generated by producing the block copolymer by condensation reaction, it was added to the oil at a temperature of the copolymers produced as a result of the above transition temperature of the gelling mixture. The gelled mixture is used as impregnation material in a direct current cable insulation having at least one conductor and an impregnated insulation system. The insulating system comprises impregnated with a dielectric gelling mixture porous, fibrous and / or dielectric isolated as a solid having a layered structure portion electrically.