The thickness of insulation layer of high temperature wire is determined according to the working electroplate of the cable and the nominal section of the cable.

 

Oil-impregnated paper insulation than rubber insulation and polyvinyl insulation has a strong heat resistance, often operating temperature up to hu ℃, high electrical strength. For insulation of cat oil-impregnated paper, voltage grades up to 35kV are used, while oil-impregnated paper insulation with supplementary oil pressure is used for voltage grades up to 60kv. Paper insulation is easy to absorb moisture, so that the insulation strength is greatly reduced, so in addition to the production of water contained in the well for oil immersion treatment, but also with the help of gold foot sheath to prevent moisture invasion. In addition, the flexibility of paper insulation is poor, so high temperature wire * small allowable bending radius and ** laying allowance. For these, special attention should be paid during construction to ensure good insulation performance.